Simplified block diagram of the device set processing chain containing three interconnected G65DDC devices in coherent mode.
Phase-coherent parts of the device set are in the red rectangles.
The G65DDC API SDK is implemented as a dynamic library (G65DDCAPI.dll). It provides object-oriented and non-object-oriented interfaces to control a set of G65DDC devices in coherent mode. This document describes the non-object-oriented interface. The G65DDCAPI.dll library exports several functions which makes it possible to control G65DDC receivers in coherent mode.
The API is not fully thread-safe so preferably it should be used in single-threaded applications. It can be used in multi-threaded applications as well, but with some care: One set of G65DDC receivers can be controlled from a single user thread only.
A C/C++ header file G65DDCAPI.h is a part of the SDK. The API can be used by any 32-bit application under Microsoft Windows 8, Windows 10 and Windows 11 (including their 64-bit versions). The API can be used also by any 64-bit application but only under 64-bit versions of the supported operating systems.
The 'G65DDC device set' in coherent mode can consist of up to 16 interconnected G65DDC devices. DDC1 signals from all the G65DDC devices in such a set are phase-coherent. All other provided signals (ADC snapshots, DDC2 and audio) are not phase-coherent. Only one processing channel per device is available in coherent mode.
The G65DDCAPI.dll library can be loaded to the application by two Microsoft Windows API functions. The first one is LoadLibrary and
the other one is LoadLibraryEx. After the library is loaded, it is necessary to get addresses of the exported functions.
When the API is no longer required in the memory, the FreeLibrary function can be used to unload the API. Before the FreeLibrary is called, all the handles to G65DDC device sets returned by the CohOpenDeviceSet function must be closed by the CohCloseDeviceSet function, otherwise the application can enter an unpredictable state.
The following source code shows how to load the API.
#include <stdio.h>
#include "G65DDCAPI.h"
COH_G65DDC_OPEN_DEVICE_SET CohOpenDeviceSet;
COH_G65DDC_CLOSE_DEVICE_SET CohCloseDeviceSet;
HMODULE hAPI;
void main(void)
{
//Loading the API
hAPI=LoadLibrary("G65DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving addresses of used API functions
CohOpenDeviceSet=(COH_G65DDC_OPEN_DEVICE_SET)GetProcAddress(hAPI,"CohOpenDeviceSet");
CohCloseDeviceSet=(COH_G65DDC_CLOSE_DEVICE_SET)GetProcAddress(hAPI,"CohCloseDeviceSet");
//Here place code that uses the API
FreeLibrary(hAPI);
}
else
{
//If the LoadLibrary fails
printf("Failed to load G65DDCAPI.dll.\n");
}
}
The G65DDC API provides the CohGetDeviceSetList function which returns a list of available G65DDC device sets which can be open using the CohOpenDeviceSet function.
The following source code produces a list of serial numbers of G65DDC devices for the available device sets.
#include <stdio.h>
#include "G65DDCAPI.h"
COH_G65DDC_GET_DEVICE_SET_LIST CohGetDeviceSetList;
COH_G65DDC_FREE_DEVICE_SET_LIST CohFreeDeviceSetList;
HMODULE hAPI;
void main(void)
{
UINT32 i,j;
COH_G65DDC_DEVICE_SET_LIST *DeviceSetList;
//Loading the API
hAPI=LoadLibrary("G65DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving address of the CohGetDeviceSetList and CohFreeDeviceSetList functions
CohGetDeviceSetList=(COH_G65DDC_GET_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohGetDeviceSetList");
CohFreeDeviceSetList=(COH_G65DDC_FREE_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohFreeDeviceSetList");
DeviceSetList=CohGetDeviceSetList();
if(DeviceSetList!=NULL)
{
if(DeviceSetList->DeviceSetCount!=0)
{
printf("Available G65DDC device set count=%d\n",DeviceSetList->DeviceSetCount);
for(i=0;i<DeviceSetList->DeviceSetCount;i++)
{
printf("Device set %u:\n",i);
printf("\tNumber of devices in the set: %u\n",DeviceSetList->DeviceSet[i].DeviceCount);
for(j=0;j<DeviceSetList->DeviceSet[i].DeviceCount;j++)
{
printf("\t\t%u: SN: %s\n",j,DeviceSetList->DeviceSet[i].DeviceInfo[j].SerialNumber);
}
}
}
else
{
printf("No available G65DDC device set has been found.\n");
}
//free memory
CohFreeDeviceSetList(DeviceSetList);
}
else
{
printf("CohGetDeviceSetList failed with error %08X\n",GetLastError());
}
FreeLibrary(hAPI);
}
else
{
printf("Failed to load G65DDCAPI.dll.\n");
}
printf("Press enter to exit\n");
getchar();
}
G65DDC device set has to be open before it can be controlled. The API provides the CohOpenDeviceSet function to open the device set of interconnected G65DDC devices in coherent mode.
The following source code shows how to open the first available G65DDC device set.
#include <stdio.h>
#include "G65DDCAPI.h"
COH_G65DDC_OPEN_DEVICE_SET CohOpenDeviceSet;
COH_G65DDC_CLOSE_DEVICE_SET CohCloseDeviceSet;
HMODULE hAPI;
void main(void)
{
INT32 hDeviceSet;
//Loading the API
hAPI=LoadLibrary("G65DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving addresses of the CohOpenDeviceSet and CohCloseDeviceSet API functions
CohOpenDeviceSet=(COH_G65DDC_OPEN_DEVICE_SET)GetProcAddress(hAPI,"CohOpenDeviceSet");
CohCloseDeviceSet=(COH_G65DDC_CLOSE_DEVICE_SET)GetProcAddress(hAPI,"CohCloseDeviceSet");
//Opening the first available G65DDC device set using predefined COH_G65DDC_OPEN_FIRST constant
hDeviceSet=CohOpenDeviceSet(COH_G65DDC_OPEN_FIRST,0);
if(hDeviceSet>=0)
{
//Place code here that works with the open G65DDC device set
//Closing handle to opened G65DDC device set
CohCloseDeviceSet(hDeviceSet);
}
else
{
printf("CohOpenDeviceSet failed with error %08X\n",GetLastError());
}
FreeLibrary(hAPI);
}
else
{
//If the LoadLibrary fails
printf("Failed to load G65DDCAPI.dll.\n");
}
}
The following code demonstrates another way to open the first available G65DDC device set using the device set list.
#include <stdio.h>
#include "G65DDCAPI.h"
COH_G65DDC_OPEN_DEVICE_SET CohOpenDeviceSet;
COH_G65DDC_CLOSE_DEVICE_SET CohCloseDeviceSet;
COH_G65DDC_GET_DEVICE_SET_LIST CohGetDeviceSetList;
COH_G65DDC_FREE_DEVICE_SET_LIST CohFreeDeviceSetList;
HMODULE hAPI;
void main(void)
{
INT32 hDeviceSet;
COH_G65DDC_DEVICE_SET_LIST *DeviceSetList;
//Loading the API
hAPI=LoadLibrary("G65DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving addresses of API functions
CohOpenDeviceSet=(COH_G65DDC_OPEN_DEVICE_SET)GetProcAddress(hAPI,"CohOpenDeviceSet");
CohCloseDeviceSet=(COH_G65DDC_CLOSE_DEVICE_SET)GetProcAddress(hAPI,"CohCloseDeviceSet");
CohGetDeviceSetList=(COH_G65DDC_GET_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohGetDeviceSetList");
CohFreeDeviceSetList=(COH_G65DDC_FREE_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohFreeDeviceSetList");
DeviceSetList=CohGetDeviceSetList();
if(DeviceSetList!=NULL)
{
if(DeviceSetList->DeviceSetCount!=0)
{
//Opening the first available G65DDC device set in the list
hDeviceSet=CohOpenDeviceSet(DeviceSetList->DeviceSet[0].DeviceInfo,DeviceSetList->DeviceSet[0].DeviceCount);
if(hDeviceSet>=0)
{
//Place code here that works with the open G65DDC device set
//Closing handle to opened G65DDC device set
CohCloseDeviceSet(hDeviceSet);
}
else
{
printf("CohOpenDeviceSet failed with error %08X\n",GetLastError());
}
}
else
{
printf("No available G65DDC device set has been found.\n");
}
CohFreeDeviceSetList(DeviceSetList);
}
else
{
printf("CohGetDeviceSetList failed with error %08X\n",GetLastError());
}
FreeLibrary(hAPI);
}
else
{
//If the LoadLibrary fails
printf("Failed to load G65DDCAPI.dll.\n");
}
}
The CohGetDeviceSetList function returns information about available G65DDC device sets that can be open.
C/C++ declaration
COH_G65DDC_DEVICE_SET_LIST* __stdcall CohGetDeviceSetList(void);
Address retrieval
COH_G65DDC_GET_DEVICE_SET_LIST CohGetDeviceSetList=(COH_G65DDC_GET_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohGetDeviceSetList");
Parameters
None
Return value
If the function succeeds, the return value is a non-zero pointer to a structure which describes a list of available sets of interconnected G65DDC devices.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the returned list of available device sets is no longer needed, the memory used by this list has to be freed using the CohFreeDeviceSetList function.
The CohFreeDeviceSetList function frees memory allocated by the CohGetDeviceSetList function. This memory is used to store a list of the available G65DDC device sets.
C/C++ declaration
void __stdcall CohFreeDeviceSetList(COH_G65DDC_DEVICE_SET_LIST *DeviceSetList);
Address retrieval
COH_G65DDC_FREE_DEVICE_SET_LIST CohFreeDeviceSetList=(COH_G65DDC_FREE_DEVICE_SET_LIST)GetProcAddress(hAPI,"CohFreeDeviceSetList");
Parameters
DeviceSetList[in] Pointer to the data structure returned by a previous call to the CohGetDeviceSetList function. This parameter cannot be NULL.
Opens a G65DDC device set.
C/C++ declaration
INT32 __stdcall CohOpenDeviceSet(G65DDC_DEVICE_INFO *DeviceInfos,UINT32 Count);
Address retrieval
COH_G65DDC_OPEN_DEVICE_SET CohOpenDeviceSet=(COH_G65DDC_OPEN_DEVICE_SET)GetProcAddress(hAPI,"CohOpenDeviceSet");
Parameters
DeviceInfos[in] Pointer to an array of G65DDC_DEVICE_INFO structures which contains information about all of the devices in the device set to be open. The number of items in the array is given by the Count parameter. The order of device info structures in the array has to correspond to the hardware interconnect of the G65DDC devices. Array of device info structures and its size can be obtained from the list of device set provided by the CohGetDeviceSetList function. The example above shows how to achieve this.
It is possible to use one of the following predefined values instead of a pointer to the array:
Value Meaning COH_G65DDC_OPEN_FIRST This function opens the first available G65DDC device set. The Count parameter is ignored, the number of interconnected devices is determined automatically. COH_G65DDC_OPEN_DEMO This function opens a demo G65DDC device set. This allows developers to work with the API without physical G65DDC devices. The Count parameter specifies the number of demo receivers in the set and can vary from 1 to 16. Count[in] Specifies the number of items in the array pointed to by the DeviceInfos parameter.
Return value
If the function succeeds, the return value is a handle to the specified G65DDC device set. This handle can only be used with functions of the G65DDC API.
If the function fails, the return value is negative. To get extended error information, call GetLastError.
Remarks
The CohOpenDeviceSet function can be called from any user thread, the returned handle can only be used in the same thread, otherwise the application can enter an unpredictable state.
Use the CohCloseDeviceSet function to close the G65DDC device set handle returned by the CohOpenDeviceSet.
The order of devices in the device set corresponds to the hardware interconnect of the G65DDC devices. Each individual device in the device set has its own constant index which does not change while the hardware G65DDC device interconnect remains the same. This index is used in some API functions to access a specific device of the device set. The index of the first device is 0 (master device), the index of the second device is 1, etc..
Closes G65DDC device set.
C/C++ declaration
BOOL __stdcall CohCloseDeviceSet(INT32 hDeviceSet);
Address retrieval
COH_G65DDC_CLOSE_DEVICE_SET CohCloseDeviceSet=(COH_G65DDC_CLOSE_DEVICE_SET)GetProcAddress(hAPI,"CohCloseDeviceSet");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Checks if all the devices in the device set are still connected to the computer.
C/C++ declaration
BOOL __stdcall CohIsConnected(INT32 hDeviceSet,BOOL *Connected);
Address retrieval
COH_G65DDC_IS_CONNECTED CohIsConnected=(COH_G65DDC_IS_CONNECTED)GetProcAddress(hAPI,"CohIsConnected");
Parameters
hDeviceSet[in] Handle to G65DDC device set returned by the CohOpenDeviceSet function.Connected[out] Pointer to a variable which receives the current connection status. If the received value is non-zero, all the devices in the given device set are still connected and available. If any device in the device set is disconnected, the received value is zero.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If any device from the set is determined disconnected, the device set is no longer usable and should be closed using CohCloseDeviceSet function.
Retrieves the number of G65DDC devices in the device set.
C/C++ declaration
BOOL __stdcall CohGetDeviceCount(INT32 hDeviceSet,UINT32 *Count);
Address retrieval
COH_G65DDC_GET_DEVICE_COUNT CohGetDeviceCount=(COH_G65DDC_GET_DEVICE_COUNT)GetProcAddress(hAPI,"CohGetDeviceCount");
Parameters
hDeviceSet[in] Handle to G65DDC device set returned by the CohOpenDeviceSet function.Count[out] Pointer to a variable which receives the number of G65DDC devices in the device set. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves information about a single G65DDC device from the device set.
C/C++ declaration
BOOL __stdcall CohGetDeviceInfo(INT32 hDeviceSet,UINT32 DeviceIndex,G65DDC_DEVICE_INFO *Info);
Address retrieval
COH_G65DDC_GET_DEVICE_INFO CohGetDeviceInfo=(COH_G65DDC_GET_DEVICE_INFO)GetProcAddress(hAPI,"CohGetDeviceInfo");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than the number of devices' in the device set. The order of the devices corresponds to the hardware interconnection of physical G65DDC devices.Info[out] Pointer to a G65DDC_DEVICE_INFO structure to be filled with information about the device. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDeviceCount function to determine the number of devices in the device set.
Retrieves information about all of the G65DDC devices in the device set at once.
C/C++ declaration
BOOL __stdcall CohGetDeviceInfos(INT32 hDeviceSet,G65DDC_DEVICE_INFO *Infos,UINT32 *InfoCount);
Address retrieval
COH_G65DDC_GET_DEVICE_INFOS CohGetDeviceInfos=(COH_G65DDC_GET_DEVICE_INFOS)GetProcAddress(hAPI,"CohGetDeviceInfos");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Infos[out] Pointer to an array of G65DDC_DEVICE_INFO structures to be filled with information about the device in the device set.The order of the device infos in the array corresponds to the hardware interconnect of physical G65DDC devices.InfoCount[in, out] Pointer to a variable that specifies the size of the array (number of items in the array) pointed to by the Infos parameter. When the function returns, this variable contains the number of items copied to Infos.If the array specified by Infos parameter is not large enough to hold information about all the devices in the device set, the function fails (GetLastError returns ERROR_INSUFFICIENT_BUFFER) and stores the required array size (number of items) in the variable pointed to by the InfoCount parameter.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDeviceCount function to determine the number of devices in the device set.
Sets the front panel LED flashing mode of the specified G65DDCe device in the device set.
C/C++ declaration
BOOL __stdcall CohSetLED(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 LEDMode);
Address retrieval
COH_G65DDC_SET_LED CohSetLED=(COH_G65DDC_SET_LED)GetProcAddress(hAPI,"CohSetLED");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.LEDMode[in] Specifies the front panel LED flashing mode, which can be one of the following:
Value Meaning G65DDC_FRONT_PANEL_LED_MODE_DIAG Diagnostic flashing. G65DDC_FRONT_PANEL_LED_MODE_ON Always on. G65DDC_FRONT_PANEL_LED_MODE_OFF Always off.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetLED function to determine the current flashing mode of the front panel LED.
A complete list of the diagnostic flashing patterns and their meaning is as follows:
No. Pattern Description Mode 1
Off No power 2
Fading No connection to computer 3
Two short flashes USB or LAN client connected, radio off 4
One short flash followed by a long one USB or LAN connected, radio on, ready 5
Two short flashes followed by a long one USB connected, driver not installed 6
Three short flashes USB or LAN connected, driver installed, application not running
Determines the current flashing mode of G65DDCe device's front panel LED.
C/C++ declaration
BOOL __stdcall CohGetLED(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *LEDMode);
Address retrieval
COH_G65DDC_GET_LED CohGetLED=(COH_G65DDC_GET_LED)GetProcAddress(hAPI,"CohGetLED");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.LEDMode[out] Pointer to a variable which receives the current flashing mode of device's front panel LED. For a list of possible values, see CohSetLED. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Turns on or off all of the G65DDC devices in the device set.
C/C++ declaration
BOOL __stdcall CohSetPower(INT32 hDeviceSet,BOOL Power);
Address retrieval
COH_G65DDC_SET_POWER CohSetPower=(COH_G65DDC_SET_POWER)GetProcAddress(hAPI,"CohSetPower");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Power[in] Specifies whether to turn on or off the devices. If this parameter is non-zero all of the devices in the device set are turned on, if it is zero then all of the devices are turned off.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. To get additional information about the failure, check the state of all of the devices in the set using the CohGetDeviceState function.
Remarks
If CohSetPower turns the devices off, all the running streams are stopped.
Use the CohGetPower function to determine the current power state of devices in the device set.
CohSetPower fails if some parts of the multichannel coherent system are not properly interconnected or improper cables are used for interconnection.
The GetPower function determines whether the devices are turned on or off.
C/C++ declaration
BOOL __stdcall CohGetPower(INT32 hDeviceSet,BOOL *Power);
Address retrieval
COH_G65DDC_GET_POWER CohGetPower=(COH_G65DDC_GET_POWER)GetProcAddress(hAPI,"CohGetPower");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Power[out] Pointer to a variable which receives the current power state of the device set. If it is non-zero, the devices are turned on. If it is zero the devices are turned off. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves the current state of the G65DDC device in the device set, like internal temperatures, error state, data transfer counters.
C/C++ declaration
BOOL __stdcall CohGetDeviceState(INT32 hDeviceSet,UINT32 DeviceIndex,G65DDC_DEVICE_STATE *State);
Address retrieval
COH_G65DDC_GET_DEVICE_STATE CohGetDeviceState=(COH_G65DDC_GET_DEVICE_STATE)GetProcAddress(hAPI,"CohGetDeviceState");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.State[out] Pointer to a G65DDC_DEVICE_STATE structure to be filled with the current device state. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables the test signal at the receiver's input, which allows testing of the entire signal and processing path.
C/C++ declaration
BOOL __stdcall CohSetBuiltInTest(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_BUILT_IN_TEST CohSetBuiltInTest=(COH_G65DDC_SET_BUILT_IN_TEST)GetProcAddress(hAPI,"CohSetBuiltInTest");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[in] Specifies whether to enable or disable the built-in test. If this parameter is non-zero, the test signal is enabled. If the parameter is zero, the test signal is disabled.Test signal parameters:
Range Frequency Level 1 65 MHz ± 5 MHz -40 dBm ± 3 dB 2 152 MHz ± 5 MHz -34 dBm ± 3 dB
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves information about whether the test signal is enabled or not.
C/C++ declaration
BOOL __stdcall CohGetBuiltInTest(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_BUILT_IN_TEST CohGetBuiltInTest=(COH_G65DDC_GET_BUILT_IN_TEST)GetProcAddress(hAPI,"CohGetBuiltInTest");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[out] Pointer to a variable which receives information about the test signal state. If it is non-zero, test signal is enabled, if it is zero, test signal is not enabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the RF input attenuator.
C/C++ declaration
BOOL __stdcall CohSetAttenuator(INT32 hDeviceSet,UINT32 Attenuator);
Address retrieval
COH_G65DDC_SET_ATTENUATOR CohSetAttenuator=(COH_G65DDC_SET_ATTENUATOR)GetProcAddress(hAPI,"CohSetAttenuator");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Attenuator[in] The value that specifies attenuation level in dB. Possible values are: 0, 3, 6, 9, 12, 15, 18, 21. If the value is not from the list, the CohSetAttenuator function rounds the value to the nearest lower one.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetAttenuator function to determine the current setting of the attenuator.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetAttenuator function with the same value of the Attenuator parameter has to be called on all of the receivers in this multichannel coherent system.
Retrieves the current setting of the RF input attenuator.
C/C++ declaration
BOOL __stdcall CohGetAttenuator(INT32 hDeviceSet,UINT32 *Attenuator);
Address retrieval
COH_G65DDC_GET_ATTENUATOR CohGetAttenuator=(COH_G65DDC_GET_ATTENUATOR)GetProcAddress(hAPI,"CohGetAttenuator");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Attenuator[out] Pointer to a variable which receives the current attenuation level. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Controls the band pass filter at the RF input in the first range.
C/C++ declaration
BOOL __stdcall CohSetPreselectors(INT32 hDeviceSet,UINT32 Low,UINT32 High);
Address retrieval
COH_G65DDC_SET_PRESELECTORS CohSetPreselectors=(COH_G65DDC_SET_PRESELECTORS)GetProcAddress(hAPI,"CohSetPreselectors");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Low[in] Specifies the cut-off low frequency of the filter in Hz. Possible values are: 0, 850000, 2400000, 5400000, 11800000. If the value is not from this list, the function rounds it to the nearest one.High[in] Specifies the cut-off high frequency of the filter in Hz. Possible values are: 3100000, 5400000, 11800000, 23300000, 88000000. If the value is not from this list, the function rounds it to the nearest one.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The value of the Low parameter must not be higher than value of the High parameter, otherwise the function fails.
Use the CohGetPreselectors function to determine the current setting of the preselectors.
If the receiver which is open (in the given device set) is part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetPreselectors function with the same values of the Low and High parameters has to be called on all of the receivers in this multichannel coherent system.
Retrieves the current setting of the RF input band pass filter.
C/C++ declaration
BOOL __stdcall CohGetPreselectors(INT32 hDeviceSet,UINT32 *Low,UINT32 *High);
Address retrieval
COH_G65DDC_GET_PRESELECTORS CohGetPreselectors=(COH_G65DDC_GET_PRESELECTORS)GetProcAddress(hAPI,"CohGetPreselectors");
Parameters
hDeviceSet[in] Handle to G65DDC device set returned by the CohOpenDeviceSet function.Low[out] Pointer to a variable which receives the current cut-off low frequency of the filter in Hz. This parameter can be NULL if the application does not require this information.High[out] Pointer to a variable which receives the current cut-off high frequency of the filter in Hz. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables the RF input preamplifier.
C/C++ declaration
BOOL __stdcall CohSetPreamplifier(INT32 hDeviceSet,BOOL Preamp);
Address retrieval
COH_G65DDC_SET_PREAMPLIFIER CohSetPreamplifier=(COH_G65DDC_SET_PREAMPLIFIER)GetProcAddress(hAPI,"CohSetPreamplifier");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Preamp[in] Specifies whether to enable or disable the RF preamplifier. If this parameter is non-zero, the preamplifier is enabled. If the parameter is zero, the preamplifier is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetPreamplifier function to determine the current state of the preamplifier.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetPreamplifier function with the same value of the Preamp parameter has to be called on for all of the receivers in this multichannel coherent system.
Retrieves the current state of the RF input preamplifier.
C/C++ declaration
BOOL __stdcall CohGetPreamplifier(INT32 hDeviceSet,BOOL *Preamp);
Address retrieval
COH_G65DDC_GET_PREAMPLIFIER CohGetPreamplifier=(COH_G65DDC_GET_PREAMPLIFIER)GetProcAddress(hAPI,"CohGetPreamplifier");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Preamp[out] Pointer to a variable which receives the current state of the preamplifier. The value is non-zero if the preamplifier is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables frequency spectrum inversion.
C/C++ declaration
BOOL __stdcall CohSetInverted(INT32 hDeviceSet,BOOL Inverted);
Address retrieval
COH_G65DDC_SET_INVERTED CohSetInverted=(COH_G65DDC_SET_INVERTED)GetProcAddress(hAPI,"CohSetInverted");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Inverted[in] Specifies whether to enable or disable frequency spectrum inversion. If this parameter is non-zero, IF spectrum is inverted.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves the current frequency spectrum inversion setting.
C/C++ declaration
BOOL __stdcall CohGetInverted(INT32 hDeviceSet,BOOL *Inverted);
Address retrieval
COH_G65DDC_GET_INVERTED CohGetInverted=(COH_G65DDC_GET_INVERTED)GetProcAddress(hAPI,"CohGetInverted");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Inverted[out] Pointer to a variable which receives a non-zero value if the frequency spectrum inversion is enabled, and zero if the inversion is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Switches the active receiver's RF input between range 1 and range 2.
C/C++ declaration
BOOL __stdcall CohSetRange(INT32 hDeviceSet,UINT32 Range);
Address retrieval
COH_G65DDC_SET_RANGE CohSetRange=(COH_G65DDC_SET_RANGE)GetProcAddress(hAPI,"CohSetRange");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Range[in] Specifies which range will be active. The value can be G65DDC_RANGE_1 for range 1, or G65DDC_RANGE_2 for range 2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. To get additional information about the failure, check state of all the devices in the set using the CohGetDeviceState function.
Remarks
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetRange function with the same value of the Range parameter has to be called on all of the receivers in this multichannel coherent system. This is to prepare all of the receivers, and then the operation has to be completed by calling the CohTrigger function on the synchronization master receiver.
Retrieves information regarding which range is active.
C/C++ declaration
BOOL __stdcall CohGetRange(INT32 hDeviceSet,UINT32 *Range);
Address retrieval
COH_G65DDC_GET_RANGE CohGetRange=(COH_G65DDC_GET_RANGE)GetProcAddress(hAPI,"CohGetRange");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Range[out] Pointer to a variable which receives G65DDC_RANGE_1 if range 1 is active, or G65DDC_RANGE_2 if range 2 is active. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables the noise blanker on the ADC stream.
C/C++ declaration
BOOL __stdcall CohSetADCNoiseBlanker(INT32 hDeviceSet,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_ADC_NOISE_BLANKER CohSetADCNoiseBlanker=(COH_G65DDC_SET_ADC_NOISE_BLANKER)GetProcAddress(hAPI,"CohSetADCNoiseBlanker");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Enabled[in] Specifies whether to enable or disable the noise blanker. If this parameter is non-zero, the noise blanker is enabled. If the parameter is zero, the noise blanker is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetADCNoiseBlanker function to determine the current state of the noise blanker.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetADCNoiseBlanker function with the same value of the Enabled parameter has to be called on all of the receivers in this multichannel coherent system.
Retrieves the current ADC noise blanker state.
C/C++ declaration
BOOL __stdcall CohGetADCNoiseBlanker(INT32 hDeviceSet,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_ADC_NOISE_BLANKER CohGetADCNoiseBlanker=(COH_G65DDC_GET_ADC_NOISE_BLANKER)GetProcAddress(hAPI,"CohGetADCNoiseBlanker");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Enabled[out] Pointer to a variable which receives the current state of the noise blanker. The value is non-zero if noise blanker is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the ADC noise blanker threshold.
C/C++ declaration
BOOL __stdcall CohSetADCNoiseBlankerThreshold(INT32 hDeviceSet,WORD Threshold);
Address retrieval
COH_G65DDC_SET_ADC_NOISE_BLANKER_THRESHOLD CohSetADCNoiseBlankerThreshold=
(COH_G65DDC_SET_ADC_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"CohSetADCNoiseBlankerThreshold");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Threshold[in] Specifies the maximum acceptable input signal. The maximum possible value of threshold is 32767, in this case the noise blanker has no effect even if it is enabled using the CohSetADCNoiseBlanker function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetADCNoiseBlankerThreshold function to retrieve the current threshold of the noise blanker.
Determines the ADC noise blanker threshold.
C/C++ declaration
BOOL __stdcall CohGetADCNoiseBlankerThreshold(INT32 hDeviceSet,WORD *Threshold);
Address retrieval
COH_G65DDC_GET_ADC_NOISE_BLANKER_THRESHOLD CohGetADCNoiseBlankerThreshold=
(COH_G65DDC_GET_ADC_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"CohGetADCNoiseBlankerThreshold");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Threshold[out] Pointer to a variable which receives the threshold of ADC noise blanker. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts the sending of ADC snapshots from a specific device of the device set.
C/C++ declaration
BOOL __stdcall CohStartADCSnapshots(INT32 hDeviceSet,UINT32 DeviceIndex,WORD Interval,UINT32 SamplesPerSnapshot);
Address retrieval
COH_G65DDC_START_ADC_SNAPSHOTS CohStartADCSnapshots=(COH_G65DDC_START_ADC_SNAPSHOTS)GetProcAddress(hAPI,"CohStartADCSnapshots");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Period[in] Specifies the time interval in milliseconds for how often the ADC snapshots are sent to the ADCSnapshotCallback callback function.SamplesPerSnapshot[in] Specifies the number of 16-bit samples per single ADC snapshot. In other words, it is the number of samples per buffer passed to the ADCSnapshotCallback callback function. It can be one of the following:
Value Number of samples per snapshot G65DDC_ADC_SAMPLES_PER_SNAPSHOT_64K 65536 G65DDC_ADC_SAMPLES_PER_SNAPSHOT_128K 131072 G65DDC_ADC_SAMPLES_PER_SNAPSHOT_256K 262144
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G65DDC device set has to be turned on using the CohSetPower function before use of CohStartADCSnapshots, otherwise the CohStartADCSnapshots function fails.
Stops the sending of ADC snapshots from a specific device of the device set.
C/C++ declaration
BOOL __stdcall CohStopADCSnapshots(INT32 hDeviceSet,UINT32 DeviceIndex,);
Address retrieval
COH_G65DDC_STOP_ADC_SNAPSHOTS CohStopADCSnapshots=(COH_G65DDC_STOP_ADC_SNAPSHOTS)GetProcAddress(hAPI,"CohStopADCSnapshots");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The ADCSnapshotCallback callback function is not called after CohStopADCSnapshots returns.
Retrieves information about the DDC format.
C/C++ declaration
BOOL __stdcall CohGetDDCInfo(INT32 hDeviceSet,UINT32 DDCTypeIndex,G65DDC_DDC_INFO *DDCInfo);
Address retrieval
COH_G65DDC_GET_DDC_INFO CohGetDDCInfo=(COH_G65DDC_GET_DDC_INFO)GetProcAddress(hAPI,"CohGetDDCInfo");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DDCTypeIndex[in] Specifies the index of DDC type. For more information, see remarks.DDCInfo[out] Pointer to a G65DDC_DDC_INFO structure to be filled with information about the DDC type.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDDC1Count function to determine the number of possible DDC types of DDC1. In this case the DDCTypeIndex parameter can vary from zero to 'one less' than the number determined by the CohGetDDC1Count.
Use the CohGetDDC1 function to determine the current DDC type index of DDC1 and the CohGetDDC2 function to determine current DDC type of DDC2.
Retrieves the number of DDC types supported by DDC1.
C/C++ declaration
BOOL __stdcall CohGetDDC1Count(INT32 hDeviceSet,UINT32 *Count);
Address retrieval
COH_G65DDC_GET_DDC1_COUNT CohGetDDC1Count=(COH_G65DDC_GET_DDC1_COUNT)GetProcAddress(hAPI,"CohGetDDC1Count");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Count[out] Pointer to a variable which receives the number of DDC types supported by the DDC1. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets current DDC type of DDC1.
C/C++ declaration
BOOL __stdcall CohSetDDC1(INT32 hDeviceSet,UINT32 DDCTypeIndex);
Address retrieval
COH_G65DDC_SET_DDC1 CohSetDDC1=(COH_G65DDC_SET_DDC1)GetProcAddress(hAPI,"CohSetDDC1");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DDCTypeIndex[in] Specifies the index of DDC type to be used in DDC1. It can vary from zero to 'one less than number of DDC types' of the DDC1.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDDC1Count function to determine the number of possible DDC types of DDC1. The DDCTypeIndex parameter can vary from zero to 'one less' than the number determined by CohGetDDC1Count.
DDC1 streaming must not run when calling CohSetDDC1. In other words, DDC1 streaming which is started using the CohStartDDC1 function has to be stopped using the CohStopDDC1 function before calling of CohSetDDC1, otherwise CohSetDDC1 fails. The CohSetDDC1 function does not start and stop DDC1 streaming, it just changes the DDC type of DDC1.
Calling of CohSetDDC1 can change the current DDC type of DDC2 and current bandwidth of demodulator filter, so it is useful to call the CohGetDDC2 and CohGetDemodulatorFilterBandwidth functions immediately after CohSetDDC1 to determine the current DDC type of DDC2 and current bandwidth of the demodulator filter.
Use the CohGetDDC1 function to determine the current DDC type of the DDC1.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetDDC1 function with the same value of the DDCTypeIndex parameter has to be called on all of the receivers in this multichannel coherent system before DDC1 streaming is started using the CohStartDDC1 function.
Retrieves information about the current DDC type of the DDC1.
C/C++ declaration
BOOL __stdcall CohGetDDC1(INT32 hDeviceSet,UINT32 *DDCTypeIndex,G65DDC_DDC_INFO *DDCInfo);
Address retrieval
COH_G65DDC_GET_DDC1 CohGetDDC1=(COH_G65DDC_GET_DDC1)GetProcAddress(hAPI,"CohGetDDC1");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DDCTypeIndex[out] Pointer to a variable which receives the index of current DDC type of the DDC1. This parameter can be NULL if the application does not require this information.DDCInfo[out] Pointer to a G65DDC_DDC_INFO structure to be filled with information about the current DDC type of the DDC1. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Returned DDCTypeIndex can be passed to the CohGetDDCInfo function.
Sets the DDC1 center frequency.
C/C++ declaration
BOOL __stdcall CohSetDDC1Frequency(INT32 hDeviceSet,INT32 Frequency);
Address retrieval
COH_G65DDC_SET_DDC1_FREQUENCY CohSetDDC1Frequency=(COH_G65DDC_SET_DDC1_FREQUENCY)GetProcAddress(hAPI,"CohSetDDC1Frequency");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Frequency[in] Specifies the new center frequency of the DDC1 in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. To get additional information about the failure, check state of all the devices in the set using the CohGetDeviceState function.
Remarks
Changing of DDC1 frequency causes a change of the absolute frequency of the DDC2 and demodulator in each device in the set.
Use the CohGetDDC1Frequency function to determine the current center frequency of DDC1.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohSetDDC1Frequency function with the same value of the Frequency parameter has to be called on all of the receivers in this multichannel coherent system. This is to prepare all of the receivers, and then the operation has to be completed by calling the CohTrigger function on the synchronization master receiver.
Retrieves the current center frequency of DDC1.
C/C++ declaration
BOOL __stdcall CohGetDDC1Frequency(INT32 hDeviceSet,INT32 *Frequency);
Address retrieval
COH_G65DDC_GET_DDC1_FREQUENCY CohGetDDC1Frequency=(COH_G65DDC_GET_DDC1_FREQUENCY)GetProcAddress(hAPI,"CohGetDDC1Frequency");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Frequency[out] Pointer to a variable which receives the current center frequency of DDC1 in Hz. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the phase shift of the DDC1 signal for a specific device in the device set.
C/C++ declaration
BOOL __stdcall CohSetDDC1PhaseShift(INT32 hDeviceSet,UINT32 DeviceIndex,double PhaseShift);
Address retrieval
COH_G65DDC_SET_DDC1_PHASE_SHIFT CohSetDDC1PhaseShift=(COH_G65DDC_SET_DDC1_PHASE_SHIFT)GetProcAddress(hAPI,"CohSetDDC1PhaseShift");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies index index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.PhaseShift[in] Specifies the new phase shift of the DDC1 signal in degrees at the current DDC1 center frequency. It can vary from -180 to +180 degrees.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
It can be used for compensation of 'small length differences' of cables used for the coherent clock or at the receiver RF inputs.
Use the CohGetDDC1PhaseShift function to retrieve the current phase shift of the DDC1 signal.
Retrieves the current phase shift of the DDC1 signal for the specific device in the device set.
C/C++ declaration
BOOL __stdcall CohGetDDC1PhaseShift(INT32 hDeviceSet,UINT32 DeviceIndex,double *PhaseShift);
Address retrieval
COH_G65DDC_GET_DDC1_PHASE_SHIFT CohGetDDC1PhaseShift=(COH_G65DDC_GET_DDC1_PHASE_SHIFT)GetProcAddress(hAPI,"CohGetDDC1PhaseShift");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.PhaseShift[out] Pointer to a variable which receives the current phase shift of the DDC1 signal in degrees. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts coherent DDC1 streaming on all of the devices in the set simultaneously.
C/C++ declaration
BOOL __stdcall CohStartDDC1(INT32 hDeviceSet,UINT32 SampleSetsPerBuffer);
Address retrieval
COH_G65DDC_START_DDC1 CohStartDDC1=(COH_G65DDC_START_DDC1)GetProcAddress(hAPI,"CohStartDDC1");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.SampleSetsPerBuffer[in] Specifies the number of I/Q sample sets in each buffer passed to the DDC1StreamCallback callback function. If the current DDC1 type index (specified by the CohSetDDC1 function) is less than or equal to 24 (DDC1 bandwidth <= 5 MHz) the value of the SampleSetsPerBuffer has to be a multiple of 64. If the current the DDC1 type index is greater than 24 (DDC1 bandwidth > 5 MHz), the SampleSetsPerBuffer has to be a multiple of 1024. If it is zero, the CohStartDDC1 function fails.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. To get additional information about the failure, check state of all the devices in the set using the CohGetDeviceState function.
Remarks
The G65DDC devices have to be turned on using the CohSetPower function before CohStartDDC1 is used. Otherwise CohStartDDC1 fails.
If the DDC1 streaming is already running before use of CohStartDDC1, CohStartDDC1 fails.
Use the CohStopDDC1 function to stop DDC1 streaming.
Decreasing the value of the SampleSetsPerBuffer parameter decreases latency and may increase CPU usage. Increasing the value of the SampleSetsPerBuffer parameter increases latency and may decrease CPU usage.
If the receiver which is open (in the given device set) is a part of the multichannel coherent system in Extended Topology Configuration (ETC, see CohSetConfiguration), then the CohStartDDC1 function with the same value of the SampleSetsPerBuffer parameter has to be called on all of the receivers in this multichannel coherent system. This is to prepare all the receivers and then the operation has to be completed by calling the CohTrigger function on the synchronization master receiver.
Stops DDC1 streaming on all of the devices of the device set.
C/C++ declaration
BOOL __stdcall CohStopDDC1(INT32 hDeviceSet);
Address retrieval
COH_G65DDC_STOP_DDC1 CohStopDDC1=(COH_G65DDC_STOP_DDC1)GetProcAddress(hAPI,"CohStopDDC1");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The CohStopDDC1 function stops all of the streaming beyond the DDC1 in the processing chain (DDC2 and audio streaming in all the devices in the set).
The DDC1StreamCallback callback function is not called after CohStopDDC1 returns.
Retrieves the number of DDC types supported by DDC2.
C/C++ declaration
BOOL __stdcall CohGetDDC2Count(INT32 hDeviceSet,UINT32 *Count);
Address retrieval
COH_G65DDC_GET_DDC2_COUNT CohGetDDC1Count=(COH_G65DDC_GET_DDC2_COUNT)GetProcAddress(hAPI,"CohGetDDC2Count");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Count[out] Pointer to a variable which receives the number of DDC types supported by the DDC2. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The maximum number of DDC types supported by the DDC2 channel is determined by the MaxDDC2TypeCount member of the G65DDC_DEVICE_INFO structure but it cannot be greater than the current DDC type index of the DDC1 channel + 1.
Sets the current DDC type of DDC2 for the specific device in the device set.
C/C++ declaration
BOOL __stdcall CohSetDDC2(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 DDCTypeIndex);
Address retrieval
COH_G65DDC_SET_DDC2 CohSetDDC2=(COH_G65DDC_SET_DDC2)GetProcAddress(hAPI,"CohSetDDC2");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.DDCTypeIndex[in] Specifies the index of the DDC type to be used in DDC2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDDC2Count function to determine the number of possible DDC types of DDC2 for the given channel. The DDCTypeIndex parameter can vary from zero to one less than the number determined by CohGetDDC2Count.
DDC2 streaming must not run when calling CohSetDDC2. In other words, DDC2 streaming that is started using the CohStartDDC2 function has to be stopped using the CohStopDDC2 function before calling of CohSetDDC2, otherwise CohSetDDC2 fails. The CohSetDDC2 function does not start and stop DDC2 streaming, it just changes the DDC type of DDC2.
Calling of CohSetDDC2 can change the current bandwidth of the demodulator filter, therefore it is useful to call the CohGetDemodulatorFilterBandwidth functions immediately after CohSetDDC2 to determine the current bandwidth of the demodulator filter.
Use the CohGetDDC2 function to determine the current DDC type of the DDC2.
Retrieves information about the current DDC type of the DDC2 for the specified device in the device set.
C/C++ declaration
BOOL __stdcall CohGetDDC2(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *DDCTypeIndex,G65DDC_DDC_INFO *DDCInfo);
Address retrieval
COH_G65DDC_GET_DDC2 CohGetDDC2=(COH_G65DDC_GET_DDC2)GetProcAddress(hAPI,"CohGetDDC2");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.DDCTypeIndex[out] Pointer to a variable which receives the index of the current DDC type of the DDC2. This parameter can be NULL if the application does not require this information.DDCInfo[out] Pointer to a G65DDC_DDC_INFO structure to be filled with information about the current DDC type of the DDC2. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The BitsPerSample member of the G65DDC_DDC_INFO structure is not used and it can be ignored for DDC2. I and Q samples in buffers passed to the DDC2StreamCallback and DDC2PreprocessedStreamCallback DDC2 callback functions are always in IEEE float (32 bit, little endian) format.
Returned DDCTypeIndex can be passed to the CohGetDDCInfo function.
Sets the relative center frequency of DDC2 for the specified device of the device set.
C/C++ declaration
BOOL __stdcall CohSetDDC2Frequency(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 Frequency);
Address retrieval
COH_G65DDC_SET_DDC2_FREQUENCY CohSetDDC2Frequency=(COH_G65DDC_SET_DDC2_FREQUENCY)GetProcAddress(hAPI,"CohSetDDC2Frequency");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Frequency[in] Specifies the new center frequency of DDC2 in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The value of the Frequency parameter is the center frequency of the DDC2 relative to center of the DDC1. The value can be negative.
The absolute frequency of the DDC2 is given by the following formula:
faDDC2 = faDDC1 + frDDC2
Where faDDC2 is the absolute center frequency of DDC2, faDDC1 is the absolute center frequency of the DDC1 in Hz (set using the CohSetDDC1Frequency function) and frDDC2 is the relative center frequency of DDC2 in Hz (set using CohSetDDC2Frequency).
A change of center frequency of the DDC1 channel causes a change of absolute frequency of the DDC2 channels (and its demodulators) connected to the given DDC1 channel.
Use the CohGetDDC2Frequency function to determine the current relative center frequency of the DDC2.
The following example shows three methods of how it is possible to set the absolute DDC2 center frequency of the first device (DeviceIndex = 0) to 11.01 MHz:
INT32 hDeviceSet; //Handle to G65DDC device set returned by the CohOpenDeviceSet function //1. method CohSetRange(hDeviceSet,G65DDC_RANGE_1); //Set active receiver's input to range 1 (0 - 88 MHz) CohSetDDC1Frequency(hDeviceSet,11010000); CohSetDDC2Frequency(hDeviceSet,0,0); //2. method, can be used if the bandwidth of DDC2 is less than the bandwidth of DDC1 CohSetRange(hDeviceSet,G65DDC_RANGE_1); CohSetDDC1Frequency(hDeviceSet,11000000); CohSetDDC2Frequency(hDeviceSet,0,10000); //3. method, can be used if the bandwidth of DDC2 is less than the bandwidth of DDC1 CohSetRange(hDeviceSet,G65DDC_RANGE_1); CohSetDDC1Frequency(hDeviceSet,11020000); CohSetDDC2Frequency(hDeviceSet,0,-10000);
Retrieves the current relative DDC2 center frequency of the specified device in the device set.
C/C++ declaration
BOOL __stdcall CohGetDDC2Frequency(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 *Frequency);
Address retrieval
COH_G65DDC_GET_DDC2_FREQUENCY CohGetDDC2Frequency=(COH_G65DDC_GET_DDC2_FREQUENCY)GetProcAddress(hAPI,"CohGetDDC2Frequency");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Frequency[out] Pointer to a variable which receives the current relative center frequency of DDC2 in Hz. The returned value can be negative. See remarks of the CohSetDDC2Frequency for information how to calculate the absolute center frequency of DDC2. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts DDC2 streaming on the specified device.
C/C++ declaration
BOOL __stdcall CohStartDDC2(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 SampleSetsPerBuffer);
Address retrieval
COH_G65DDC_START_DDC2 CohStartDDC2=(COH_G65DDC_START_DDC2)GetProcAddress(hAPI,"CohStartDDC2");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.SampleSetsPerBuffer[in] Specifies the number of I/Q sample sets in each buffer passed to the DDC2StreamCallback and DDC2PreprocessedStreamCallback callback functions. The value has to be a multiple of 64 greater than zero. If it is zero, the CohStartDDC2 function fails. If it is not a multiple of 64, the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before CohStartDDC2 is used, the devices of the device set have to be turned on using the CohSetPower function and DDC1 streaming has to be started using the CohStartDDC1 function, otherwise CohStartDDC2 fails.
If the DDC2 streaming for a given device is already running, CohStartDDC2 fails.
Use the CohStopDDC2 function to stop DDC2 streaming.
Decreasing the value of the SampleSetsPerBuffer parameter decreases latency and may increase CPU usage. Increasing the value of the SampleSetsPerBuffer parameter increases latency and may decrease CPU usage.
Stops DDC2 streaming on the specified device.
C/C++ declaration
BOOL __stdcall CohStopDDC2(INT32 hDeviceSet,UINT32 DeviceIndex);
Address retrieval
COH_G65DDC_STOP_DDC2 CohStopDDC2=(COH_G65DDC_STOP_DDC2)GetProcAddress(hAPI,"CohStopDDC2");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio streaming for a given device is running, it is stopped too.
If DDC2 streaming is not active, CohStopDDC2 does nothing.
The DDC2StreamCallback and DDC2PreprocessedStreamCallback callback functions are not called when CohStopDDC2 returns.
Enables or disables the noise blanker on the DDC2 stream of the specified device.
C/C++ declaration
BOOL __stdcall CohSetDDC2NoiseBlanker(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_DDC2_NOISE_BLANKER CohSetDDC2NoiseBlanker=(COH_G65DDC_SET_DDC2_NOISE_BLANKER)GetProcAddress(hAPI,"CohSetDDC2NoiseBlanker");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[in] Specifies whether to enable or disable the noise blanker. If this parameter is non-zero, the noise blanker is enabled. If the parameter is zero, the noise blanker is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDDC2NoiseBlanker function to determine the current state of the noise blanker.
Retrieves the current DDC2 noise blanker state of the specified device.
C/C++ declaration
BOOL __stdcall CohGetDDC2NoiseBlanker(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_DDC2_NOISE_BLANKER CohGetDDC2NoiseBlanker=(COH_G65DDC_GET_DDC2_NOISE_BLANKER)GetProcAddress(hAPI,"CohGetDDC2NoiseBlanker");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[out] Pointer to a variable which receives the current state of noise blanker. The value is non-zero if noise blanker is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the DDC2 noise blanker threshold of the specified device.
C/C++ declaration
BOOL __stdcall CohSetDDC2NoiseBlankerThreshold(INT32 hDeviceSet,UINT32 DeviceIndex,double Threshold);
Address retrieval
COH_G65DDC_SET_DDC2_NOISE_BLANKER_THRESHOLD CohSetDDC2NoiseBlankerThreshold=
(COH_G65DDC_SET_DDC2_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"CohSetDDC2NoiseBlankerThreshold");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Threshold[in] Specifies threshold in %.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetDDC2NoiseBlankerThreshold function to retrieve the current threshold of the noise blanker.
Retrieves the DDC2 noise blanker threshold of the specified device.
C/C++ declaration
BOOL __stdcall CohGetDDC2NoiseBlankerThreshold(INT32 hDeviceSet,UINT32 DeviceIndex,double *Threshold);
Address retrieval
COH_G65DDC_GET_DDC2_NOISE_BLANKER_THRESHOLD CohGetDDC2NoiseBlankerThreshold=
(COH_G65DDC_GET_DDC2_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"CohGetDDC2NoiseBlankerThreshold");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Threshold[out] Pointer to a variable which receives the threshold of the noise blanker. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Determines a value which indicates the percentage ratio between the 'short time average signal level' and the 'maximum level'.
C/C++ declaration
BOOL __stdcall CohGetDDC2NoiseBlankerExcessValue(INT32 hDeviceSet,UINT32 DeviceIndex,double *Value);
Address retrieval
COH_G65DDC_GET_DDC2_NOISE_BLANKER_EXCESS_VALUE CohGetDDC2NoiseBlankerExcessValue=
(COH_G65DDC_GET_DDC2_NOISE_BLANKER_EXCESS_VALUE)GetProcAddress(hAPI,"CohGetDDC2NoiseBlankerExcessValue");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Value[out] Pointer to a variable which receives the current excess value in %. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Determines the current signal level for the specified device.
C/C++ declaration
BOOL __stdcall CohGetSignalLevel(INT32 hDeviceSet,UINT32 DeviceIndex,FLOAT *Peak,FLOAT *RMS);
Address retrieval
COH_G65DDC_GET_SIGNAL_LEVEL CohGetSignalLevel=(COH_G65DDC_GET_SIGNAL_LEVEL)GetProcAddress(hAPI,"CohGetSignalLevel");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Peak[out] Pointer to a variable which receives the current signal level (peak) in Volts. This parameter can be NULL if the application does not require this information.RMS[out] Pointer to a variable which receives the current signal level (RMS) in Volts. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
DDC2 streaming has to be active (started using the CohStartDDC2 function) before calling of CohGetSignalLevel, otherwise the returned peak and RMS signal levels are zero.
The signal level is evaluated from the signal after the demodulator filter and before the notch filter (see block diagram), the signal is selected by the demodulator filter.
The signal level is evaluated for each buffer processed by the demodulator filter. The buffer size (signal level evaluation rate) is given by the SampleSetsPerBuffer parameter of the CohStartDDC2 function.
The DDC2PreprocessedStreamCallback callback function provides the signal level for each buffer passed to the callback, i.e. for each buffer used in the signal level evaluation. This provides a way to get the signal level from each processed buffer without the need to poll it using CohGetSignalLevel.
To convert RMS signal level in Volts to power in dBm use the following formulas:
P[W] = (VRMS)2 / R = (VRMS)2 / 50
P[dBm]= 10 * log10( P[W] * 1000 )
Where VRMS is the RMS signal level in Volts obtained by CohGetSignalLevel, R is the G65DDC receiver input impedance (50 Ω), P[W] is power in Watts, P[dBm] is power in dBm and 1000 is the conversion coefficient W -> mW.
The following example shows how to obtain the current signal level in dBm from device 0:
#include <stdio.h> #include <math.h> INT32 hDeviceSet; //handle to G65DDC device set returned by the CohOpenDeviceSet function float P_dBm,V_RMS; CohGetSignalLevel(hDeviceSet,0,NULL,&V_RMS); P_dBm=10.0*log10(V_RMS*V_RMS*(1000.0/50.0)); printf("Current signal level [RMS]: %.1f dBm\n",P_dBm);
Enables or disables the notch filter of the specified device.
C/C++ declaration
BOOL __stdcall CohSetNotchFilter(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_NOTCH_FILTER CohSetNotchFilter=(COH_G65DDC_SET_NOTCH_FILTER)GetProcAddress(hAPI,"CohSetNotchFilter");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Enabled[in] Specifies whether to enable or disable the notch filter. If this parameter is non-zero, the filter is enabled. If the parameter is zero, the filter is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetNotchFilter function to determine whether the filter is enabled or disabled.
Retrieves the current notch filter state of the specified device.
C/C++ declaration
BOOL __stdcall CohGetNotchFilter(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_NOTCH_FILTER CohGetNotchFilter=(COH_G65DDC_GET_NOTCH_FILTER)GetProcAddress(hAPI,"CohGetNotchFilter");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Enabled[out] Pointer to a variable which receives the current state of the notch filter. The value is non-zero if the filter is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the relative center frequency of the notch filter for the specified device.
C/C++ declaration
BOOL __stdcall CohSetNotchFilterFrequency(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,INT32 Frequency);
Address retrieval
COH_G65DDC_SET_NOTCH_FILTER_FREQUENCY CohSetNotchFilterFrequency=
(COH_G65DDC_SET_NOTCH_FILTER_FREQUENCY)GetProcAddress(hAPI,"CohSetNotchFilterFrequency");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Frequency[in] Specifies the new center frequency of the notch filter in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The value of the Frequency parameter is the new center frequency of the notch filter relative to center of the DDC2 (see the CohSetDDC2Frequency function). The value can be negative.
Use the CohGetNotchFilterFrequency function to retrieve the current center frequency of the notch filter.
Retrieves the current relative center frequency of the notch filter.
C/C++ declaration
BOOL __stdcall CohGetNotchFilterFrequency(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,INT32 *Frequency);
Address retrieval
G65DDC_GET_NOTCH_FILTER_FREQUENCY CohGetNotchFilterFrequency=
(G65DDC_GET_NOTCH_FILTER_FREQUENCY)GetProcAddress(hAPI,"CohGetNotchFilterFrequency");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Frequency[out] Pointer to a variable which receives the current center frequency of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the bandwidth of the notch filter of the specified device.
C/C++ declaration
BOOL __stdcall CohSetNotchFilterBandwidth(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,UINT32 Bandwidth);
Address retrieval
COH_G65DDC_SET_NOTCH_FILTER_BANDWIDTH CohSetNotchFilterBandwidth=
(COH_G65DDC_SET_NOTCH_FILTER_BANDWIDTH)GetProcAddress(hAPI,"CohSetNotchFilterBandwidth");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Bandwidth[in] Specifies the new bandwidth of the notch filter in Hz. The bandwidth can be from range 1 - 3000 Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetNotchFilterBandwidth function to retrieve the current bandwidth of the notch filter.
Retrieves the current bandwidth of the notch filter for the specified device.
C/C++ declaration
BOOL __stdcall CohGetNotchFilterBandwidth(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,UINT32 *Bandwidth);
Address retrieval
COH_G65DDC_GET_NOTCH_FILTER_BANDWIDTH CohGetNotchFilterBandwidth=
(COH_G65DDC_GET_NOTCH_FILTER_BANDWIDTH)GetProcAddress(hAPI,"CohGetNotchFilterBandwidth");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Bandwidth[out] Pointer to a variable which receives the current bandwidth of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the notch filter length for the specified device. The notch filter is implemented as an FIR filter. This function specifies the number of coefficients used in the filtration procedure.
C/C++ declaration
BOOL __stdcall CohSetNotchFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,UINT32 Length);
Address retrieval
G65DDC_SET_NOTCH_FILTER_LENGTH CohSetNotchFilterLength=
(G65DDC_SET_NOTCH_FILTER_LENGTH)GetProcAddress(hAPI,"CohSetNotchFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Length[in] Specifies the length of the notch filter. The value has to be multiple of 8, greater than or equal to 64 and less than or equal to 32768. If it is not multiple of 8, the function rounds it up to the nearest multiple of 8.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases the filter steepness and may increase CPU usage.
Use the CohGetNotchFilterLength function to determine the current length of the notch filter.
Retrieves the current notch filter length of the specified device.
C/C++ declaration
BOOL __stdcall CohGetNotchFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 NotchFilterIndex,UINT32 *Length);
Address retrieval
COH_G65DDC_GET_NOTCH_FILTER_LENGTH CohGetNotchFilterLength=
(COH_G65DDC_GET_NOTCH_FILTER_LENGTH)GetProcAddress(hAPI,"CohGetNotchFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.NotchFilterIndex[in] Specifies the notch filter index. Possible values are: 0, 1.Length[out] Pointer to a variable which receives the current length of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohSetAGC(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_AGC CohSetAGC=(COH_G65DDC_SET_AGC)GetProcAddress(hAPI,"CohSetAGC");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[in] Specifies whether to enable or disable the AGC. If this parameter is non-zero, the AGC is enabled. If the parameter is zero, the AGC is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the AGC is disabled, the signal is affected by the 'fixed gain' specified using the CohSetGain function.
Use the CohGetAGC function to determine the current state of the AGC.
Retrieves the current state of the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohGetAGC(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_AGC CohGetAGC=(COH_G65DDC_GET_AGC)GetProcAddress(hAPI,"CohGetAGC");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[out] Pointer to a variable which receives the current state of the AGC. The value is non-zero if the AGC is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets parameters of the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohSetAGCParams(INT32 hDeviceSet,UINT32 DeviceIndex,double AttackTime,double DecayTime,double ReferenceLevel);
Address retrieval
COH_G65DDC_SET_AGC_PARAMS CohSetAGCParams=(COH_G65DDC_SET_AGC_PARAMS)GetProcAddress(hAPI,"CohSetAGCParams");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.AttackTime[in] Specifies the new attack time of the AGC in seconds.DecayTime[in] Specifies the new decay time of the AGC in seconds.ReferenceLevel[in] Specifies the new reference level of the AGC in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetAGCParams function to determine the current parameters of the AGC.
Retrieves the current parameters of the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohGetAGCParams(INT32 hDeviceSet,UINT32 DeviceIndex,double *AttackTime,double *DecayTime,double *ReferenceLevel);
Address retrieval
COH_G65DDC_GET_AGC_PARAMS CohGetAGCParams=(COH_G65DDC_GET_AGC_PARAMS)GetProcAddress(hAPI,"CohGetAGCParams");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.AttackTime[out] Pointer to a variable which receives the current attack time of the AGC in seconds. This parameter can be NULL if the application does not require this information.DecayTime[out] Pointer to a variable which receives the current decay time of the AGC in seconds. This parameter can be NULL if the application does not require this information.ReferenceLevel[out] Pointer to a variable which receives the current reference level of the AGC in dB. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the maximum gain of the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohSetMaxAGCGain(INT32 hDeviceSet,UINT32 DeviceIndex,double MaxGain);
Address retrieval
COH_G65DDC_SET_MAX_AGC_GAIN CohSetMaxAGCGain=(COH_G65DDC_SET_MAX_AGC_GAIN)GetProcAddress(hAPI,"CohSetMaxAGCGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.MaxGain[in] Specifies the new maximum gain of the AGC in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetMaxAGCGain function to determine the maximum gain of the AGC.
Retrieves the current maximum gain of the AGC for the specified device.
C/C++ declaration
BOOL __stdcall CohGetMaxAGCGain(INT32 hDeviceSet,UINT32 DeviceIndex,double *MaxGain);
Address retrieval
COH_G65DDC_GET_MAX_AGC_GAIN CohGetMaxAGCGain=(COH_G65DDC_GET_MAX_AGC_GAIN)GetProcAddress(hAPI,"CohGetMaxAGCGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.MaxGain[out] Pointer to a variable which receives the current maximum gain of the AGC in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets fixed gain for the specified device. This gain is applied to the I/Q signal if the AGC is disabled, otherwise it is not used.
C/C++ declaration
BOOL __stdcall CohSetGain(INT32 hDeviceSet,UINT32 DeviceIndex,double Gain);
Address retrieval
COH_G65DDC_SET_GAIN CohSetGain=(COH_G65DDC_SET_GAIN)GetProcAddress(hAPI,"CohSetGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Gain[in] Specifies the new fixed gain in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetGain function to determine the current fixed gain.
Retrieves the current fixed gain of the specified device.
C/C++ declaration
BOOL __stdcall CohGetGain(INT32 hDeviceSet,UINT32 DeviceIndex,double *Gain);
Address retrieval
COH_G65DDC_GET_GAIN CohGetGain=(COH_G65DDC_GET_GAIN)GetProcAddress(hAPI,"CohGetGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Gain[out] Pointer to a variable which receives the current fixed gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves the current gain that is applied to the I/Q signal of the specified device.
C/C++ declaration
BOOL __stdcall CohGetCurrentGain(INT32 hDeviceSet,UINT32 DeviceIndex,double *CurrentGain);
Address retrieval
COH_G65DDC_GET_CURRENT_GAIN CohGetCurrentGain=(COH_G65DDC_GET_CURRENT_GAIN)GetProcAddress(hAPI,"CohGetCurrentGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.CurrentGain[out] Pointer to a variable which receives the current gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the AGC is enabled (using the CohSetAGC function), the variable pointed to by the CurrentGain parameter is filled by the current gain of the AGC. If the AGC is disabled, the variable pointed to by the CurrentGain parameter is filled by fixed gain that is specified using the CohSetGain function.
Sets the bandwidth of the demodulator filter for the specified device.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorFilterBandwidth(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Bandwidth);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_FILTER_BANDWIDTH CohSetDemodulatorFilterBandwidth=
(COH_G65DDC_SET_DEMODULATOR_FILTER_BANDWIDTH)GetProcAddress(hAPI,"CohSetDemodulatorFilterBandwidth");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Bandwidth[in] Specifies the new bandwidth of the demodulator filter in Hz. Possible values are from the range of 1 Hz to the current DDC2 bandwidth. Use the CohGetDDC2 function to retrieve information about the current DDC type of DDC2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The demodulator filter bandwidth can be changed using the CohSetDDC1 function. It can change DDC type of DDC2 and if the current demodulator filter bandwidth is greater than the new bandwidth of DDC2, the demodulator filter bandwidth is reduced. So it is useful to call the CohGetDemodulatorFilterBandwidth function immediately after CohSetDDC1.
Retrieves the current demodulator filter bandwidth of the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorFilterBandwidth(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *Bandwidth);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_FILTER_BANDWIDTH CohGetDemodulatorFilterBandwidth=
(COH_G65DDC_GET_DEMODULATOR_FILTER_BANDWIDTH)GetProcAddress(hAPI,"CohGetDemodulatorFilterBandwidth");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Bandwidth[out] Pointer to a variable which receives the current demodulator filter bandwidth. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the demodulator filter shift of the specified device.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorFilterShift(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 Shift);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_FILTER_SHIFT CohSetDemodulatorFilterShift=
(COH_G65DDC_SET_DEMODULATOR_FILTER_SHIFT)GetProcAddress(hAPI,"CohSetDemodulatorFilterShift");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Shift[in] Specifies the new shift of the demodulator filter in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The value of the Shift parameter is shift in Hz relative to center of the demodulator. This value can be negative.
This function does not change the demodulator frequency, it just shifts the filter from the demodulator's center.
Use the CohGetDemodulatorFilterShift function to determine the current demodulator filter shift.
Retrieves the current shift of the demodulator filter for the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorFilterShift(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 *Shift);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_FILTER_SHIFT CohGetDemodulatorFilterShift=
(COH_G65DDC_GET_DEMODULATOR_FILTER_SHIFT)GetProcAddress(hAPI,"CohGetDemodulatorFilterShift");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Shift[out] Pointer to a variable which receives the current shift of the demodulator. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the demodulator filter length of the specified device. The demodulator filter is implemented as an FIR filter. This function specifies the number of coefficients used in the filtration procedure.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Length);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_FILTER_LENGTH CohSetDemodulatorFilterLength=
(COH_G65DDC_SET_DEMODULATOR_FILTER_LENGTH)GetProcAddress(hAPI,"CohSetDemodulatorFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Length[in] Specifies the length of the demodulator filter. The value has to be a multiple of 8, greater than or equal to 64 and less than or equal to 32768. If it is not a multiple of 8, the function rounds it up to nearest multiple of 8.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases the filter steepness and may increase CPU usage.
Use the CohGetDemodulatorFilterLength function to determine the current length of the demodulator filter.
Retrieves the current length of the demodulator filter for the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *Length);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_FILTER_LENGTH CohGetDemodulatorFilterLength=
(COH_G65DDC_GET_DEMODULATOR_FILTER_LENGTH)GetProcAddress(hAPI,"CohGetDemodulatorFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Length[out] Pointer to a variable which receives the current demodulator filter length. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the demodulator mode of the specified device.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorMode(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Mode);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_MODE CohSetDemodulatorMode=(COH_G65DDC_SET_DEMODULATOR_MODE)GetProcAddress(hAPI,"CohSetDemodulatorMode");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Mode[in] Specifies the new demodulator mode. This value can be one of the following:
Value Meaning G65DDC_MODE_AM Amplitude modulation G65DDC_MODE_AMS Amplitude modulation G65DDC_MODE_LSB Lower sideband modulation G65DDC_MODE_USB Upper sideband modulation G65DDC_MODE_DSB Double sideband modulation G65DDC_MODE_ISB Independent sideband modulation G65DDC_MODE_CW Continuous wave G65DDC_MODE_FM Frequency modulation G65DDC_MODE_DRM Digital Radio Mondiale
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
DRM demodulation is only available if a valid DRM key is loaded using the CohSetDRMKey function. More information about obtaining a DRM key can be viewed at https://www.winradio.com/home/drm.htm.
Use the CohGetDemodulatorMode function to retrieve the current demodulator mode.
Retrieves the current demodulator mode of the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorMode(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *Mode);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_MODE CohGetDemodulatorMode=(COH_G65DDC_GET_DEMODULATOR_MODE)GetProcAddress(hAPI,"CohGetDemodulatorMode");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Mode[out] Pointer to a variable which receives the current demodulator mode. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the relative center frequency of the demodulator for the specified device.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorFrequency(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 Frequency);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_FREQUENCY CohSetDemodulatorFrequency=
(COH_G65DDC_SET_DEMODULATOR_FREQUENCY)GetProcAddress(hAPI,"CohSetDemodulatorFrequency");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Frequency[in] Specifies the new center frequency of the demodulator in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The value of the Frequency parameter is the center frequency of the demodulator relative to the center of the DDC2. The value can be negative.
The absolute frequency of the demodulator is given by the following formula:
faDEM = faDDC1 + frDDC2 + frDEM
Where faDEM is the absolute center frequency of the demodulator in Hz, faDDC1 is the absolute center frequency of the DDC1 in Hz (set using the CohSetDDC1Frequency function), frDDC2 is the relative center frequency of DDC2 of in Hz (set using the CohSetDDC2Frequency) and frDEM is the relative center frequency of the demodulator in Hz (set using CohSetDemodulatorFrequency).
The absolute center frequency of the demodulator is the real-world frequency that you are listening to.
Use the CohGetDemodulatorFrequency function to determine the current relative center frequency of the demodulator for the given device.
The following example shows three methods of how to set the absolute demodulator center frequency of the device 0 to 11.01 MHz:
INT32 hDeviceSet; //Handle to a G65DDC device set returned by the CohOpenDeviceSet function //1. method CohSetRange(hDeviceSet,G65DDC_RANGE_1); //Set active receiver's input to range 1 (0 - 88 MHz) CohSetDDC1Frequency(hDeviceSet,11010000); CohSetDDC2Frequency(hDeviceSet,0,0); CohSetDemodulatorFrequency(hDeviceSet,0,0); //2. method CohSetRange(hDeviceSet,G65DDC_RANGE_1); CohSetDDC1Frequency(hDeviceSet,11000000); CohSetDDC2Frequency(hDeviceSet,0,10000); CohSetDemodulatorFrequency(hDeviceSet,0,0); //3. method CohSetRange(hDeviceSet,G65DDC_RANGE_1); CohSetDDC1Frequency(hDeviceSet,11020000); CohSetDDC2Frequency(hDeviceSet,0,-5000); CohSetDemodulatorFrequency(hDeviceSet,0,-5000);
Retrieves the current relative center frequency of the demodulator for the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorFrequency(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 *Frequency);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_FREQUENCY CohGetDemodulatorFrequency=
(COH_G65DDC_GET_DEMODULATOR_FREQUENCY)GetProcAddress(hAPI,"CohGetDemodulatorFrequency");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Frequency[out] Pointer to a variable which receives the current center frequency of the demodulator. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets a parameter of demodulation for the specified device.
C/C++ declaration
BOOL __stdcall CohSetDemodulatorParam(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Code,const void *Buffer,UINT32 BufferSize);
Address retrieval
COH_G65DDC_SET_DEMODULATOR_PARAM CohSetDemodulatorParam=
(COH_G65DDC_SET_DEMODULATOR_PARAM)GetProcAddress(hAPI,"CohSetDemodulatorParam");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Code[in] Specifies the code of the demodulator parameter to be set by this function. The code can be one of the following:
Value Meaning G65DDC_DEMODULATOR_PARAM_AMS_SIDE_BAND Side band for synchronous AM demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
The value of the variable pointed to by the Buffer parameter can be one of the following:
G65DDC_SIDE_BAND_LOWER
AMS demodulator will use lower sidebandG65DDC_SIDE_BAND_UPPER
AMS demodulator will use upper sidebandG65DDC_SIDE_BAND_BOTH
AMS demodulator will use both side bands.G65DDC_DEMODULATOR_PARAM_AMS_CAPTURE_RANGE Capture range of the synchronous AM demodulator.
The Buffer parameter has to be pointer to a G65DDC_AMS_CAPTURE_RANGE structure, and the BufferSize parameter has to be sizeof(G65DDC_AMS_CAPTURE_RANGE).
G65DDC_DEMODULATOR_PARAM_CW_FREQUENCY CW tone frequency
The Buffer parameter has to be pointer to a INT32 variable, and the BufferSize parameter has to be sizeof(INT32).
The value of the variable pointed to by the Buffer parameter is the CW tone frequency in Hz.
G65DDC_DEMODULATOR_PARAM_DSB_SIDE_BAND Side band for DSB demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
The value of the variable pointed to by the Buffer parameter can be one of the following:
G65DDC_SIDE_BAND_LOWER
DSB demodulator will use lower sidebandG65DDC_SIDE_BAND_UPPER
DSB demodulator will use upper sidebandG65DDC_SIDE_BAND_BOTH
DSB demodulator will use both side bands.G65DDC_DEMODULATOR_PARAM_ISB_SIDE_BAND Side band for ISB demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
The value of the variable pointed to by the Buffer parameter can be one of the following:
G65DDC_SIDE_BAND_LOWER
ISB demodulator will use lower sidebandG65DDC_SIDE_BAND_UPPER
ISB demodulator will use upper sidebandG65DDC_SIDE_BAND_BOTH
ISB demodulator will use both side bands.G65DDC_DEMODULATOR_PARAM_DRM_AUDIO_SERVICE Audio service of DRM demodulator/decoder to be listening to.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
The value of the variable pointed to by the Buffer parameter is index of the audio service. Possible values are: 1, 2, 3, 4, where 1 is the first audio service, 2 is the second one, etc. Use the CohGetDemodulatorState function with G65DDC_DEMODULATOR_STATE_DRM_STATUS to retrieve information about the available audio services for the currently received DRM station.
G65DDC_DEMODULATOR_PARAM_DRM_MULTIMEDIA_SERVICE Multimedia service of DRM demodulator/decoder to be decoded.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
The value of the variable pointed to by the Buffer parameter is index of the multimedia service. Possible values are: 1, 2, 3, 4, where 1 is the first multimedia service, 2 is the second one, etc. Use the CohGetDemodulatorState function with G65DDC_DEMODULATOR_STATE_DRM_STATUS to retrieve information about the available multimedia services for the currently received DRM station.
The DRM multimedia player has to be installed to display multimedia content. It is included in the G65DDC software installer as an option.
Buffer[in] Pointer to a buffer containing the value of the demodulator parameter which this function will set. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves a parameter of demodulation for the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorParam(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Code,void *Buffer,UINT32 BufferSize);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_PARAM CohGetDemodulatorParam=
(COH_G65DDC_GET_DEMODULATOR_PARAM)GetProcAddress(hAPI,"CohGetDemodulatorParam");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Code[in] Specifies the code of the demodulator parameter to be retrieved. For detailed information about available codes see CohSetDemodulatorParam.Buffer[out] Pointer to a buffer which receives the requested parameter. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves information about the current demodulator state of the specified device.
C/C++ declaration
BOOL __stdcall CohGetDemodulatorState(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Code,void *Buffer,UINT32 BufferSize);
Address retrieval
COH_G65DDC_GET_DEMODULATOR_STATE CohGetDemodulatorState=
(COH_G65DDC_GET_DEMODULATOR_STATE)GetProcAddress(hAPI,"CohGetDemodulatorState");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Code[in] Specifies the code of the demodulator state to be retrieved. The code can be one of the following:
Value Meaning G65DDC_DEMODULATOR_STATE_AMS_LOCK Lock state of synchronous AM demodulation.
The Buffer parameter has to be pointer to a BOOL variable, and the BufferSize parameter has to be sizeof(BOOL).
The received value is non-zero if synchronous AM demodulator is locked to signal, and zero if it is not locked.
G65DDC_DEMODULATOR_STATE_AMS_FREQUENCY Frequency in Hz which synchronous AM demodulator is locked to. It is relative to center of the demodulator. It can be negative.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G65DDC_DEMODULATOR_STATE_AM_DEPTH Depth of AM modulation in %.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G65DDC_DEMODULATOR_STATE_DSB_LOCK Lock state of DSB demodulation.
The Buffer parameter has to be pointer to a BOOL variable, and the BufferSize parameter has to be sizeof(BOOL).
The received value is non-zero if DSB demodulator is locked to signal, and zero if it is not locked.
G65DDC_DEMODULATOR_STATE_DSB_FREQUENCY Frequency in Hz which DSB demodulator is locked to. It is relative to center of the demodulator. It can be negative.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G65DDC_DEMODULATOR_STATE_TUNE_ERROR Estimated tune error in Hz.
The Buffer parameter has to be pointer to an INT32 variable, and the BufferSize parameter has to be sizeof(INT32).
The received value is the difference between demodulator frequency and the frequency of the received signal. Subtract the returned tune error from the demodulator frequency to get the frequency of the received signal. Tune error is relative to center of the demodulator and it can be negative.
G65DDC_DEMODULATOR_STATE_DRM_STATUS Status of the DRM demodulator/decoder.
The Buffer parameter has to be pointer to a G65DDC_DRM_STATUS structure, and the BufferSize parameter has to be sizeof(G65DDC_DRM_STATUS).
G65DDC_DEMODULATOR_STATE_FM_DEVIATION Estimated frequency deviation in Hz.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Buffer[out] Pointer to a buffer which receives the requested information. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts audio streaming for the specified device.
C/C++ declaration
BOOL __stdcall CohStartAudio(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 SampleSetsPerBuffer);
Address retrieval
COH_G65DDC_START_AUDIO CohStartAudio=(COH_G65DDC_START_AUDIO)GetProcAddress(hAPI,"CohStartAudio");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.SampleSetsPerBuffer[in] Specifies the number of sample sets in each buffer passed to the AudioStreamCallback callback function. The value has to be a multiple of 64 greater than zero. If it is zero, the CohStartAudio function fails. If it is not a multiple of 64, the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before CohStartAudio is used, the G65DDC devices have to be turned on using the CohSetPower function, DDC1 streaming has to be started using the CohStartDDC1 function and DDC2 streaming has to be started using the CohStartDDC2 function, otherwise CohStartAudio fails.
If the audio streaming of the specified device is already running, CohStartAudio fails.
Use the CohStopAudio function to stop audio streaming.
Decreasing the value of the SampleSetsPerBuffer parameter decreases latency and may increase CPU usage. Increasing the value of the SampleSetsPerBuffer parameter increases latency and may decrease CPU usage.
Stops audio streaming for the specified device.
C/C++ declaration
BOOL __stdcall CohStopAudio(INT32 hDeviceSet,UINT32 DeviceIndex);
Address retrieval
COH_G65DDC_STOP_AUDIO CohStopAudio=(COH_G65DDC_STOP_AUDIO)GetProcAddress(hAPI,"CohStopAudio");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio streaming is not active, CohStopAudio does nothing.
The AudioStreamCallback callback function is not called after CohStopAudio returns.
Sets fixed audio gain of the specified device.
C/C++ declaration
BOOL __stdcall CohSetAudioGain(INT32 hDeviceSet,UINT32 DeviceIndex,double Gain);
Address retrieval
COH_G65DDC_SET_AUDIO_GAIN CohSetAudioGain=(COH_G65DDC_SET_AUDIO_GAIN)GetProcAddress(hAPI,"CohSetAudioGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Gain[in] Specifies a new fixed audio gain in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetAudioGain function to retrieve the current audio gain.
Retrieves the current fixed audio gain of the specified device.
C/C++ declaration
BOOL __stdcall CohGetAudioGain(INT32 hDeviceSet,UINT32 DeviceIndex,double *Gain);
Address retrieval
COH_G65DDC_GET_AUDIO_GAIN CohGetAudioGain=(COH_G65DDC_GET_AUDIO_GAIN)GetProcAddress(hAPI,"CohGetAudioGain");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Gain[out] Pointer to a variable which receives the current fixed gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables the audio filter of the specified device.
C/C++ declaration
BOOL __stdcall CohSetAudioFilter(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_AUDIO_FILTER CohSetAudioFilter=(COH_G65DDC_SET_AUDIO_FILTER)GetProcAddress(hAPI,"CohSetAudioFilter");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[in] Specifies whether to enable or disable the audio filter. If this parameter is non-zero, the filter is enabled. If the parameter is zero, the filter is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetAudioFiler function to retrieve the current state of the audio filter.
Retrieves the current state of the audio filter for the specific device.
C/C++ declaration
BOOL __stdcall CohGetAudioFilter(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_AUDIO_FILTER CohGetAudioFilter=(COH_G65DDC_GET_AUDIO_FILTER)GetProcAddress(hAPI,"CohGetAudioFilter");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Enabled[out] Pointer to a variable which receives the current state of the audio filter. The value is non-zero if the filter is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the parameters of the audio filter for the specified device.
C/C++ declaration
BOOL __stdcall CohSetAudioFilterParams(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 CutOffLow,UINT32 CutOffHigh,double Deemphasis);
Address retrieval
COH_G65DDC_SET_AUDIO_FILTER_PARAMS CohSetAudioFilterParams=
(COH_G65DDC_SET_AUDIO_FILTER_PARAMS)GetProcAddress(hAPI,"CohSetAudioFilterParams");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.CutOffLow[in] Specifies the cut-off low frequency of the filter in Hz. This is the start frequency of the filter's passband, it can be from the range of 0 to 23999 Hz. The value has to be less than the cut-off high frequency specified by the CutOffHigh parameter.CutOffHigh[in] Specifies the cut-off high frequency of the filter in Hz. This is the end frequency of the filter's passband, it can be from the range of 1 - 24000 Hz. The value has to be greater than the cut-off low frequency specified by the CutOffLow parameter.Deemphasis[in] Specifies the de-emphasis of the filter in dB per octave. De-emphasis starts at the cut-off low frequency of the filter. This value can be from the range of -9.9 to 0.0 dB/octave. Zero means that de-emphasis is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetAudioFilerParams function to retrieve the current parameters of the audio filter.
Retrieves the current parameters of the audio filter for the specified device.
C/C++ declaration
BOOL __stdcall CohGetAudioFilterParams(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *CutOffLow,UINT32 *CutOffHigh,double *Deemphasis);
Address retrieval
COH_G65DDC_GET_AUDIO_FILTER_PARAMS CohGetAudioFilterParams=
(COH_G65DDC_GET_AUDIO_FILTER_PARAMS)GetProcAddress(hAPI,"CohGetAudioFilterParams");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.CutOffLow[out] Pointer to a variable which receives the current cut-off low frequency of the filter. This parameter can be NULL if the application does not require this information.CutOffHigh[out] Pointer to a variable which receives the current cut-off high frequency of the filter. This parameter can be NULL if the application does not require this information.Deemphasis[out] Pointer to a variable which receives the current de-emphasis setting of the filter. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies the audio filter length of the specified device. The audio filter is implemented as an FIR filter. This function specifies the number of coefficients used in the filtration procedure.
C/C++ declaration
BOOL __stdcall CohSetAudioFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 Length);
Address retrieval
COH_G65DDC_SET_AUDIO_FILTER_LENGTH CohSetAudioFilterLength=
(COH_G65DDC_SET_AUDIO_FILTER_LENGTH)GetProcAddress(hAPI,"CohSetAudioFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Length[in] Specifies the length of the audio filter. The value has to be multiple of 8, greater than or equal to 64 and less than or equal to 32768. If it is not a multiple of 8, the function rounds it up to nearest multiple of 8.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases the filter steepness and may increase CPU usage.
Use the CohGetAudioFilterLength function to determine the current length of the audio filter.
Retrieves the current audio filter length of the specified device.
C/C++ declaration
BOOL __stdcall CohGetAudioFilterLength(INT32 hDeviceSet,UINT32 DeviceIndex,UINT32 *Length);
Address retrieval
COH_G65DDC_GET_AUDIO_FILTER_LENGTH CohGetAudioFilterLength=
(COH_G65DDC_GET_AUDIO_FILTER_LENGTH)GetProcAddress(hAPI,"CohGetAudioFilterLength");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Length[out] Pointer to a variable which receives the current length of the audio filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the audio volume of the specified device.
C/C++ declaration
BOOL __stdcall CohSetVolume(INT32 hDeviceSet,UINT32 DeviceIndex,BYTE Volume);
Address retrieval
COH_G65DDC_SET_VOLUME CohSetVolume=(COH_G65DDC_SET_VOLUME)GetProcAddress(hAPI,"CohSetVolume");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Volume[in] Specifies the new volume. The value can vary from 0 to 31, where 31 means maximum volume.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetVolume function to retrieve the current volume.
Retrieve the current volume of the specified device.
C/C++ declaration
BOOL __stdcall CohGetVolume(INT32 hDeviceSet,UINT32 DeviceIndex,BYTE *Volume);
Address retrieval
COH_G65DDC_GET_VOLUME CohGetVolume=(COH_G65DDC_GET_VOLUME)GetProcAddress(hAPI,"CohGetVolume");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Volume[out] Pointer to a variable which receives the current volume. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Mutes or unmutes the audio of the specified device.
C/C++ declaration
BOOL __stdcall CohSetMute(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL Mute);
Address retrieval
COH_G65DDC_SET_MUTE CohSetMute=(COH_G65DDC_SET_MUTE)GetProcAddress(hAPI,"CohSetMute");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Mute[in] Specifies whether to mute or unmute the audio. If this parameter is non-zero, the audio is muted. If the parameter is zero, the audio is unmuted.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the CohGetMute function to retrieve the current mute state.
Retrieves the current mute state of the specified device.
C/C++ declaration
BOOL __stdcall CohGetMute(INT32 hDeviceSet,UINT32 DeviceIndex,BOOL *Mute);
Address retrieval
COH_G65DDC_GET_MUTE CohGetMute=(COH_G65DDC_GET_MUTE)GetProcAddress(hAPI,"CohGetMute");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.Mute[out] Pointer to a variable which receives the current mute state. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Determines the compensation data for the frequency spectrum computed from the DDC1 or DDC2 signal or ADC snapshots. It is used to convert relative amplitudes in dB to absolutes ones in dBm.
C/C++ declaration
BOOL __stdcall CohGetSpectrumCompensation(INT32 hDeviceSet,UINT32 DeviceIndex,INT32 CenterFrequency,UINT32 Bandwidth,FLOAT *Buffer,UINT32 Count);
Address retrieval
COH_G65DDC_GET_SPECTRUM_COMPENSATION CohGetSpectrumCompensation=
(COH_G65DDC_GET_SPECTRUM_COMPENSATION)GetProcAddress(hAPI,"CohGetSpectrumCompensation");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DeviceIndex[in] Specifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.CenterFrequency[in] Specifies the absolute center frequency of the requested compensation data in Hz.Bandwidth[in] Specifies the width of the requested compensation data in Hz.Buffer[out] Pointer to a buffer to be filled with compensation data. This parameter cannot be NULL.Count[in] Specifies the number of FLOAT items in the buffer pointed to by the Buffer parameter.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The following example shows how to use the CohGetSpectrumCompensation function in DDC2StreamCallback callback function:
//The following is a declaration of a function which computes FFT from I/Q signal stored in //the buffer pointed to be the Input parameter. The result is stored in complex form in the buffer //pointed to by the Output parameter. The size of the FFT is given by the Size parameter. //The example uses 2048 bins FFT. void FFT(float *Output,const float *Input,int Size); INT32 hDeviceSet; //handle to G65DDC device set INT32 AbsDDC2Frequency; //Absolute frequency of the DDC2 INT32 RelDDC2Frequency; //Relative frequency of the DDC2 INT32 DDC1Frequency; //DDC1 frequency G65DDC_DDC_INFO DDC2Info; //Information about the current DDC type of the DDC2 FLOAT FFTBuffer[2*2048]; //Buffer for FFT result FLOAT Compensation[2048]; //Buffer for compensation data UINT32 FirstBin,LastBin; //the first and last bins in the FFT of the useful DDC2 band G65DDC_CALLBACKS Callbacks; //Structure which contains a pointer to callback functions Code before... //Retrieve frequency of the DDC1 CohGetDDC1Frequency(hDeviceSet,&DDC1Frequency); //Retrieve relative frequency of the DDC2 for device 0 CohGetDDC2Frequency(hDeviceSet,0,&RelDDC2Frequency); //Calculate absolute frequency of the DDC2 AbsDDC2Frequency=DDC1Frequency+RelDDC2Frequency; //Retrieve DDC type information of the DDC2 CohGetDDC2(hDeviceSet,NULL,&DDC2Info); //Retrieve compensation data for device 0 CohGetSpectrumCompensation(hDeviceSet,0,AbsDDC2Frequency,DDC2Info.SampleRate,Compensation,2048); //In this case the Bandwidth parameter is equal to sample rate, because we need compensation data //for whole DDC2 band. //Compensation data have to be updated after change of absolute DDC2 frequency using //the CohSetDDC1Frequency or CohSetDDC2Frequency function. //In this case a mutual-exclusion synchronization method (for example critical section) should be used //if the Compensation buffer would be modified outside the MyDDC2StreamCallback callback. FirstBin=2048*(DDC2Info.SampleRate-DDC2Info.Bandwidth)/2/DDC2Info.SampleRate; LastBin=2048*(DDC2Info.SampleRate+DDC2Info.Bandwidth)/2/DDC2Info.SampleRate; //Set callback function for DDC2 streaming //Pointers to callback function which should not be called by the API have to be set to NULL. Callbacks.DDC2StreamCallback=MyDDC2StreamCallback; //Start DDC2 streaming for device 0 //The SamplesPerBuffer parameter is set to 2048 which is size of the FFT to simplify //the example. CohStartDDC2(hDeviceSet,0,2048); Code after... void __stdcall MyDDC2StreamCallback(UINT32 DeviceIndex,CONST FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData) { UINT32 i; //Compute FFT FFT(FFTBuffer,Buffer,2048); //Converts complex FFT result to dB for(i=0;i<2048;i++) { FFTBuffer[i]=(FLOAT)(10.0*log10(FFTBuffer[i*2]*FFTBuffer[i*2]+FFTBuffer[i*2+1]*FFTBuffer[i*2+1])); } //Apply compensation data to get amplitudes in frequency spectrum in dBm for(i=0;i<2048;i++) { FFTBuffer[i]+=Compensation[i]; } //now the FFTBuffer contains amplitudes in dBm //Useful band starts at the bin given by the FirstBin variable //and ends at the bin given by the LastBin variable. }
Registers user-defined functions as callback functions called by the API.
C/C++ declaration
BOOL __stdcall CohSetCallbacks(INT32 hDeviceSet,CONST COH_G65DDC_CALLBACKS *Callbacks,DWORD_PTR UserData);
Address retrieval
COH_G65DDC_SET_CALLBACKS CohSetCallbacks=(COH_G65DDC_SET_CALLBACKS)GetProcAddress(hAPI,"CohSetCallbacks");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Callbacks[in] Pointer to a COH_G65DDC_CALLBACKS structure which contains pointers to the user-defined functions to be registered as callback functions.UserData[in] Specifies a user-defined value which is passed to the callback functions.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the application does not require that the API calls some callback functions, set the related member of the COH_G65DDC_CALLBACKS structure to NULL.
If the value of the Callbacks parameter is NULL, all the callback functions are unregistered, the API will not call any callback functions.
Sets a directory with a DRM key file to unlock the DRM demodulator/decoder.
C/C++ declaration
BOOL __stdcall CohSetDRMKey(INT32 hDeviceSet,CONST CHAR *DRMKeyFileDirectory);
Address retrieval
COH_G65DDC_SET_DRM_KEY CohSetDRMKey=(COH_G65DDC_SET_DRM_KEY)GetProcAddress(hAPI,"CohSetDRMKey");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.DRMKeyFileDirectory[in] Pointer to a null-terminated string that specifies the directory which contains a valid DRM key file.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the specified directory contains a valid DRM key file, the key is loaded and the DRM demodulator/decoder is unlocked and available for use, otherwise the function fails.
If the DRM demodulator/decoder is already unlocked, this function does nothing.
Use the CohIsDRMUnlocked function to determine whether the DRM demodulator/decoder is unlocked or not.
More information about obtaining a DRM key can be viewed at https://www.winradio.com/home/drm.htm.
Determines whether the DRM demodulator/decoder is unlocked or not.
C/C++ declaration
BOOL __stdcall CohIsDRMUnlocked(INT32 hDeviceSet);
Address retrieval
COH_G65DDC_IS_DRM_UNLOCKED CohIsDRMUnlocked=(COH_G65DDC_IS_DRM_UNLOCKED)GetProcAddress(hAPI,"CohIsDRMUnlocked");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.
Return value
If this function succeeds and the DRM demodulator/decoder is unlocked, the return value is non-zero.
If the function fails or the DRM demodulator/decoder is locked, the return value is zero. To get extended error information, call GetLastError.
Enables the 1PPS functionality on the master receiver of the specified device set.
C/C++ declaration
BOOL __stdcall CohSet1PPSEnabled(INT32 hDeviceSet,BOOL Enabled);
Address retrieval
COH_G65DDC_SET_1PPS_ENABLED CohSet1PPSEnabled=(COH_G65DDC_SET_1PPS_ENABLED)GetProcAddress(hAPI,"CohSet1PPSEnabled");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Enabled[in] Specifies whether to enable or disable the 1PPS functionality on the master receiver. If this parameter is non-zero, the 1PPS functionality is enabled. If the parameter is zero, the 1PPS functionality is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G65DDC device set has to be turned off when using the CohSet1PPSEnabled function, otherwise CohSet1PPSEnabled fails. The 1PPS functionality state cannot be changed when the device set is turned on using the CohSetPower function.
When the device set is turned on using the CohSetPower function and the 1PPS functionality is enabled at least four 1PPS pulses are needed to synchronize the internal control logic to the 1PPS. The CohSetRange, CohSetDDC1Frequency and CohStartDDC1 functions may fail if the control logic is not synchronized. In this case check the master device state using the CohGetDeviceState function to verify that the control logic is synchronized to the 1PPS.
Retrieves the current state of the 1PPS functionality for the specified device set.
C/C++ declaration
BOOL __stdcall CohGet1PPSEnabled(INT32 hDeviceSet,BOOL *Enabled);
Address retrieval
COH_G65DDC_GET_1PPS_ENABLED CohGet1PPSEnabled=(COH_G65DDC_GET_1PPS_ENABLED)GetProcAddress(hAPI,"CohGet1PPSEnabled");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Enabled[out] Pointer to a variable which receives the current state of the 1PPS functionality. The value is non-zero if the 1PPS functionality is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves the state of the master receiver 1PPS counters for the specified device set. These counters can be used for evaluation of presence and quality of the 1PPS signal used for time stamping of the DDC1 signal.
C/C++ declaration
BOOL __stdcall CohGet1PPSCounters(INT32 hDeviceSet,UINT32 *EventCounter,UINT32 *ADCPeriodCounter);
Address retrieval
COH_G65DDC_GET_1PPS_COUNTERS CohGet1PPSCounters=(COH_G65DDC_GET_1PPS_COUNTERS)GetProcAddress(hAPI,"CohGet1PPSCounters");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.EventCounter[out] Pointer to a variable which receives the current value of the 1PPS event counter. The value represents the number of 1PPS events since the device set was turned on using the CohSetPower function. This parameter can be NULL.ADCPeriodCounter[out] Pointer to a variable which receives the current value of ADC sample counter. The value specifies the number of ADC samples elapsed between the last two 1PPS events. The normal value is ~210e6. This parameter can be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before the CohGet1PPSCounters function is used, the 1PPS functionality has to be enabled using the CohSet1PPSEnabled function, the device set has to be turned on using the CohSetPower function and the internal control logic has to be synchronized to the 1PPS (see the CohGetDeviceState function), otherwise CohGet1PPSCounters may fail.
Retrieves the state of the DDC1 sample counter for the specified device set.
C/C++ declaration
BOOL __stdcall CohGet1PPSDDC1Counters(INT32 hDeviceSet,double *SampleCounter,UINT64 *ADCPeriodCounter);
Address retrieval
COH_G65DDC_GET_1PPS_DDC1_COUNTERS CohGet1PPSDDC1Counters=(COH_G65DDC_GET_1PPS_DDC1_COUNTERS)GetProcAddress(hAPI,"CohGet1PPSDDC1Counters");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.SampleCounter[out] Pointer to a variable which receives the current value of the DDC1 sample counter. The value is the number of sample sets produced by the given DDC1 from the time when it was started (using the CohStartDDC1 function) to the last 1PPS event. This parameter can be NULL.ADCPeriodCounter[out] Pointer to a variable which receives the current value of the ADC sample counter. The value is the number of ADC samples at the input of the given DDC1 from the time when it was started (using the CohStartDDC1 function) to the last 1PPS event. This parameter can be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before the CohGet1PPSDDC1Counters function is used, the 1PPS functionality has to be enabled using the CohSet1PPSEnabled function, the device set has to be turned on using the CohSetPower function, the internal control logic has to be synchronized to the 1PPS (see the CohGetDeviceState function) and DDC1 streaming has to be started using the CohStartDDC1 function, otherwise CohGet1PPSDDC1Counters may fail.
Sets the delay of the synchronization cables used in the specified device set.
C/C++ declaration
BOOL __stdcall CohSetTriggerDelay(INT32 hDeviceSet,UINT32 Delay);
Address retrieval
COH_G65DDC_SET_TRIGGER_DELAY CohSetTriggerDelay=(COH_G65DDC_SET_TRIGGER_DELAY)GetProcAddress(hAPI,"CohSetTriggerDelay");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Delay[in] The value that specifies the synchronization cable delay in ADC sampling clock periods.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G65DDC device set has to be turned off when using the CohSetTriggerDelay function, otherwise CohSetTriggerDelay fails. The delay cannot be changed when the device set is turned on using the CohSetPower function.
The synchronization SMA patch cables supplied with the kit delay the synchronization signal by 1 sampling clock period. The delay can be different for custom synchronization cables.
All cables used for synchronization must be of the same delay. Cables of various delays cannot be mixed within one coherent device set.
Retrieves the current setting of the synchronization cable delay for the specified device set.
C/C++ declaration
BOOL __stdcall CohGetTriggerDelay(INT32 hDeviceSet,UINT32 *Delay);
Address retrieval
COH_G65DDC_GET_TRIGGER_DELAY CohGetTriggerDelay=(COH_G65DDC_GET_TRIGGER_DELAY)GetProcAddress(hAPI,"CohGetTriggerDelay");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Delay[out] Pointer to a variable which receives the current value of the synchronization cable delay. This parameter can be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
This function is used to specify the type of configuration used for installation of the given coherent set.
C/C++ declaration
BOOL __stdcall CohSetConfiguration(INT32 hDeviceSet,UINT32 Configuration);
Address retrieval
COH_G65DDC_SET_CONFIGURATION CohSetConfiguration=(COH_G65DDC_SET_CONFIGURATION)GetProcAddress(hAPI,"CohSetConfiguration");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Configuration[in] Specifies the type of configuration. The value can be one of the following:
Value Meaning COH_G65DDC_CONFIGURATION_NORMAL Standard installation of G65DDC receivers for multichannel coherent operation. The receivers are connected to the same computer.
The API controls all of the receivers at once during setting of the DDC1 frequency using the CohSetDDC1Frequency function and starting of the DDC1 streaming using the CohStartDDC1 function.
The API provides DDC1 samples with the same index (a position since the DDC1 start, see CohStartDDC1) from all of the receivers together at once. The application does not need to put them together according to their index.
COH_G65DDC_CONFIGURATION_EXTENDED
Non-standard, Extended Topology Configuration (ETC) for multichannel coherent operation of the G65DDC receivers, which allows the receivers to be installed in multiple computers. Typically, each G65DDC receiver is installed in a separate dedicated computer. Installation of multiple receivers inside the same computer is allowed in the ETC configuration, however the receivers installed inside the same computer act the same way as they would if installed in separate dedicated computers. In other words, each receiver has to run its own instance of software. Necessary connections between the receivers and other supportive hardware are realized externally, outside of the computers.
The device set which is referenced by the hDeviceSet has to consist of a single receiver. This means that each receiver in the single ETC multichannel system has to be open in its own device set object and therefore a single device set corresponds to a single receiver in the ETC multichannel system. The COH_G65DDC_CONFIGURATION_EXTENDED has to be specified in each such device set object.
The application layer is responsible for the synchronized DDC1 streaming start and frequency setting. This is divided into two steps. The first step is preparation of the receiver for the synchronized DDC1 streaming start or frequency setting, using the CohStartDDC1 or CohSetDDC1Frequency function for all the receivers connected together in the same ETC multichannel system. The second step is the synchronized completion of the operation generating the synchronization signal on the synchronization master receiver using the CohTrigger function. The master receiver is the first receiver is the synchronization chain. The same DDC1 frequency and DDC1 type have to be set in all of the receivers in the same ETC multichannel system before calling the CohTrigger function.
If each receiver in the same ETC multichannel system is installed into a separate computer, the application can use TCP/IP or another form of communication between computers to achieve the proper setting and synchronization of the receivers when changing DDC1 frequency or starting DDC1 streaming.
The application layer is responsible for putting DDC1 samples from separate receivers together according to their index (a position since the DDC1 start, see CohStartDDC1).
The application layer is responsible for setting of all the receiver parameters, which should be the same on all of the receivers in the same multichannel coherent system, such as the input range, preamplifier, attenuator, pre-selectors and ADC noise blanker.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G65DDC devices have to be turned off using the CohSetPower function before CohSetConfiguration is used. Otherwise CohSetConfiguration fails.
Use the CohGetConfiguration function to determine the current setting of the configuration.
Retrieves the current setting of the configuration.
C/C++ declaration
BOOL __stdcall CohGetConfiguration(INT32 hDeviceSet,UINT32 *Configuration);
Address retrieval
COH_G65DDC_GET_CONFIGURATION CohGetConfiguration=(COH_G65DDC_GET_CONFIGURATION)GetProcAddress(hAPI,"CohGetConfiguration");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Configuration[out] Pointer to a variable which receives the current configuration setting (see CohSetConfiguration for detailed information). This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Used to specify parameters of the multichannel coherent system in Extended Topology Configuration (ETC), see CohSetConfiguration. In ETC, the G65DDC device set always consists of a single receiver, therefore information about the complete multichannel coherent system has to be additionally specified using this function.
C/C++ declaration
BOOL __stdcall CohSetExtendedConfigurationParams(INT32 hDeviceSet,UINT32 Index,UINT32 DeviceCount);
Address retrieval
COH_G65DDC_SET_EXTENDED_CONFIGURATION_PARAMS CohSetExtendedConfigurationParams=
(COH_G65DDC_SET_EXTENDED_CONFIGURATION_PARAMS)GetProcAddress(hAPI,"CohSetExtendedConfigurationParams");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Index[in] Specifies the index of the receiver (which is open in the given device set) in the synchronization chain of the multichannel coherent system. The index of the first receiver is 0 and this receiver is called the synchronization master. Other receivers are called synchronization slaves and their index varies from 1 to one less than DeviceCount. This parameter is not equal to the index of the receiver in the given device set. The index of the receiver in the given device set is always equal to 0 because in ETC, the device set always consists of a single receiver.DeviceCount[in] Specifies the total number of receivers connected to the multichannel coherent system in ETC. The value of this parameter has to be greater than zero.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G65DDC devices have to be turned off using the CohSetPower function before CohSetExtendedConfigurationParams is used. Otherwise CohSetExtendedConfigurationParams fails.
Use the CohGetExtendedConfigurationParams function to determine the current parameters of the multichannel coherent system in the ETC.
Retrieves the current parameters of the multichannel coherent system in Extended Topology Configuration (ETC), see CohSetConfiguration.
C/C++ declaration
BOOL __stdcall CohGetExtendedConfigurationParams(INT32 hDeviceSet,UINT32 *Index,UINT32 *DeviceCount);
Address retrieval
COH_G65DDC_GET_EXTENDED_CONFIGURATION_PARAMS CohGetExtendedConfigurationParams=
(COH_G65DDC_GET_EXTENDED_CONFIGURATION_PARAMS)GetProcAddress(hAPI,"CohGetExtendedConfigurationParams");Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.Index[out] Pointer to a variable which receives the index of the receiver (which is open in the given device set) in the multichannel coherent system. This parameter can be NULL if the application does not require this information.DeviceCount[out] Pointer to a variable which receives total number of the receivers in the multichannel coherent system. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Generates the synchronization signal to synchronize the completion of the receiver's input switching, DDC1 start or DDC1 frequency settings in all of the receivers in a multichannel coherent system in Extended Topology Configuration (ETC), see CohSetConfiguration.
C/C++ declaration
BOOL __stdcall CohTrigger(INT32 hDeviceSet);
Address retrieval
COH_G65DDC_TRIGGER CohTrigger=(COH_G65DDC_TRIGGER)GetProcAddress(hAPI,"CohTrigger");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. To get additional information about the failure, check state of all the devices in the set using the CohGetDeviceState function.
Remarks
The multichannel coherent system has to be in ETC (see CohSetConfiguration), otherwise CohTrigger fails.
The CohTrigger can only be called on the receiver which is the synchronization master. This is the first receiver connected in the synchronization chain and its index specified by the CohSetExtendedConfigurationParams function is equal to zero. Otherwise CohTrigger fails.
The G65DDC devices have to be turned on using the CohSetPower function before CohTrigger is used. Otherwise CohTrigger fails.
The CohTrigger has to be used always after the CohSetRange, CohSetDDC1Frequency or CohStartDDC1 function is called with the same parameters for all of the receivers in the same multichannel coherent system to complete the operation.
All the receivers in the same ETC multichannel coherent system have to use the same DDC1 type (see CohSetDDC1).
If the CohTrigger function succeeds, the CohTriggerTest function has to be called for all the receivers in the same ETC multichannel coherent system to verify successful completion of synchronized operation.
Tests and verifies completion of operation performed synchronously on all of the receivers in a multichannel coherent system in Extended Topology Configuration (ETC), see CohSetConfiguration.
C/C++ declaration
BOOL __stdcall CohTriggerTest(INT32 hDeviceSet);
Address retrieval
COH_G65DDC_TRIGGER_TEST CohTriggerTest=(COH_G65DDC_TRIGGER_TEST)GetProcAddress(hAPI,"CohTriggerTest");
Parameters
hDeviceSet[in] Handle to a G65DDC device set returned by the CohOpenDeviceSet function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The multichannel coherent system has to be in ETC (see CohSetConfiguration), otherwise CohTriggerTest fails.
The G65DDC devices have to be turned on using the CohSetPower function before CohTriggerTest is used. Otherwise CohTriggerTest fails.
The CohTrigger function has to succeed on the master receiver before CohTriggerTest can be used.
If the CohTrigger function succeeds, the CohTriggerTest function has to be called for all the receivers in the same ETC multichannel ETC coherent system, including the master receiver.
The synchronized operation which was triggered by the latest call of the CohTrigger function is completed successfully if CohTriggerTest succeeds on all the receiver of the ETC multichannel coherent system.
Contains information about the G65DDC device.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
CHAR DevicePath[MAX_PATH];
BYTE InterfaceType;
CHAR SerialNumber[9];
WORD HWVersion;
WORD FWVersion[3];
BYTE EEPROMVersion;
struct
{
UINT32 MinFrequency;
UINT32 MaxFrequency;
} Ranges[2];
UINT32 MaxDDC1ChannelCount;
UINT32 MaxDDC2ChannelCount;
UINT32 MaxDDC1TypeCount;
UINT32 MaxDDC2TypeCount;
UINT32 MaxDDC2ChannelsPerDDC1Channel;
UINT32 Flags;
BYTE MACAddress[6];
} G65DDC_DEVICE_INFO;
#pragma pack(pop)
Members
DevicePathThe device system path in a null-terminated string.If the device information structure is obtained from an already open device using the CohGetDeviceInfo function, the DevicePath can contain a remote address/port of the device, if it is connected via its LAN interface.
InterfaceTypeDevice interface type. The value can be one of the following:
Value Meaning G65DDC_INTERFACE_TYPE_PCIE The device is connected to the computer via PCI express. G65DDC_INTERFACE_TYPE_USB2 The device is connected to the computer via USB that is not capable of USB3 speeds. The receiver works in limited mode, DDC1 bandwidths above 6.4 MHz are not available. G65DDC_INTERFACE_TYPE_USB3 The device is connected to the computer via USB3. G65DDC_INTERFACE_TYPE_LAN The device is connected to the computer via a LAN interface. The receiver works in limited mode, DDC1 bandwidths above 16 MHz are not available. G65DDC_INTERFACE_TYPE_DEMO Demo G65DDC device. SerialNumberSerial number in null-terminated string.HWVersionVersion of the hardware.FWVersion[3]Version of the firmwares.EEPROMVersionEEPROM structure version.RangesSpecifies the minimum (MinFrequency) and the maximum (MaxFrequency) frequencies (in Hz) for both of the supported receiver's input ranges.MaxDDC1ChannelCountMaximum number of DDC1 channels. Only a single DDC1 channel is supported in the coherent mode.MaxDDC2ChannelCountMaximum number of DDC2 channels. Only a single DDC2 channel is supported in the coherent mode.MaxDDC1TypeCountMaximum number of DDC types supported by the DDC1 channel.MaxDDC2TypeCountMaximum number of DDC types supported by the DDC2 channel. The current maximum can be determined using the CohGetDDC2Count function because it is also limited by the currently selected DDC type of the DDC1 channel.MaxDDC2ChannelsPerDDC1ChannelMaximum number of DDC2 channels per DDC1 channel. Only a single DDC2 channel is supported in the coherent mode.FlagsHardware configuration flags can be a combination of the following values:
Value Meaning G65DDC_FLAGS_EXTERNAL_REFERENCE_IN The device includes an external reference oscillator input. G65DDC_FLAGS_COHERENT The device supports coherent mode. G65DDC_FLAGS_EXTERNAL_REFERENCE_OUT The device includes a reference oscillator output. G65DDC_FLAGS_1PPS The device includes a 1PPS input. MACAddressPhysical Ethernet address of the devices.
Contains information about the device state.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 Flags;
INT32 Temperatures[3];
UINT32 FanRPM;
UINT64 DataTransferred;
UINT64 DataLost;
} G65DDC_DEVICE_STATE;
#pragma pack(pop)
Members
FlagsA set of bits flags. This member can be a combination of the following flags:
Value Meaning G65DDC_DEVICE_STATE_HIGH_TEMPERATURE Critical temperature is detected and the device is turned off automatically. In this case the application should call CohSetPower to turn off explicitly. G65DDC_DEVICE_STATE_NO_1PPS The internal control logic is not synchronized to the 1PPS signal yet. When the 1PPS functionality is enabled using the CohSet1PPSEnabled function, at least four 1PPS pulses are needed to synchronize the control logic to the 1PPS. If this flag is set for a long time, check the cables and connections. G65DDC_DEVICE_STATE_NOT_ARMED Synchronized operation was not completed successfully. Failed to set the device to armed mode. Check cables and connections. G65DDC_DEVICE_STATE_TRIGGER_NOT_SENT Synchronized operation was not completed successfully. Master device failed to send a trigger signal. This can happen when synchronized operation is performed but the control logic is not synchronized to the 1PPS yet. G65DDC_DEVICE_STATE_NOT_TRIGGERED Synchronized operation was not completed successfully. Check the cables and connections. TemperaturesInternal device's temperatures in °C. If the temperature is not available or it is unknown the value is equal to G65DDC_TEMPERATURE_UNKNOWN.FanRPMDevice's fan rotations per minute. Zero value means the fan is off.DataTransferredTotal number of bytes transferred from/to the device since it has been open.DataLostTotal number of bytes lost. A non-zero value can indicate an unreliable (USB/LAN) connection or connection with insufficient data throughput.
Contains information about the DDC type.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 SampleRate;
UINT32 Bandwidth;
UINT32 BitsPerSample;
} G65DDC_DDC_INFO;
#pragma pack(pop)
Members
SampleRateSample rate of I/Q signal in Hz.BandwidthUseful bandwidth in Hz.BitsPerSampleNumber of bits per sample. This can be 16 or 32. It is used to determine the bits per sample for DDC1.
Contains information about the G65DDC device set.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 DeviceCount;
G65DDC_DEVICE_INFO *DeviceInfo;
} COH_G65DDC_DEVICE_SET;
#pragma pack(pop)
Members
DeviceCountNumber of devices in the device set / number of items in the array pointed to by the DeviceInfo member.DeviceInfoPointer to an array of device info structures for all the devices in the device set.
List of the G65DDC device sets.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 DeviceSetCount;
COH_G65DDC_DEVICE_SET *DeviceSet;
} COH_G65DDC_DEVICE_SET_LIST;
#pragma pack(pop)
Members
DeviceSetCountNumber of devices sets / number of items in the array pointed to by the DeviceSet member.DeviceSetPointer to an array of device set structures.
Contains information about the AMS capture range.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 Tune;
UINT32 Lock;
} G65DDC_AMS_CAPTURE_RANGE;
#pragma pack(pop)
Members
TuneInitial capture range in Hz.LockCapture range (in Hz) used when the AMS demodulator is locked.
Contains the network parameters of the device.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
WORD Size
UINT32 IpAddress;
UINT32 Mask;
} G65DDC_NETWORK_PARAMS;
#pragma pack(pop)
Members
SizeThe size of this data structure, in bytes. Set this member to sizeof(G65DDC_NETWORK_PARAMS).IpAddressIPv4 address in network byte order.MaskNetmask in network byte order.
Contains pointers to user-defined functions to be registered as callback functions.
Each callback function is called in context of the thread created by the API. If some shared data are accessed inside callback functions, it is recommended to use a mutual-exclusion synchronization method. The application should not call any G65DDC API function from the inside callback functions, otherwise the function fails. The only exception is the CohGetSpectrumCompensation function which can be called from inside the callback functions.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
COH_G65DDC_DDC1_STREAM_CALLBACK DDC1StreamCallback;
COH_G65DDC_ADC_SNAPSHOT_CALLBACK ADCSnapshotCallback;
COH_G65DDC_DDC2_STREAM_CALLBACK DDC2StreamCallback;
COH_G65DDC_DDC2_PREPROCESSED_STREAM_CALLBACK DDC2PreprocessedStreamCallback;
COH_G65DDC_AUDIO_STREAM_CALLBACK AudioStreamCallback;
} COH_G65DDC_CALLBACKS;
#pragma pack(pop)
Members
Pointer to a user-defined function to be registered as DDC1 stream callback. It is called by the API to pass coherent I/Q samples from DDC1 for all the devices in the device set to the application at once. The DDC1 streaming is started using the CohStartDDC1 function.
C/C++ declaration
void __stdcall DDC1StreamCallback(UINT32 DeviceCount,const void **Buffers,UINT32 Count,UINT32 BitsPerSample,DWORD_PTR UserData);Parameters
DeviceCountSpecifies the number of I/Q sample buffers in the array pointed to by the Buffers. It is equal to number of devices in the device set (see the CohGetDeviceCount function).BuffersPointer to an array of pointers to the buffers which contain I/Q sample sets from the DDC1. Sample rate and bits per sample are given by the used DDC type, see the CohSetDDC1 function. One I/Q sample set consists of two samples. The order of the buffers in the array corresponds to the hardware interconnection of the G65DDC devices.CountSpecifies the number of I/Q sample sets in each buffer in the Buffers array. This value is equal to the value of the SampleSetsPerBuffer parameter of the CohStartDDC1 function.BitsPerSampleSpecifies the number of bits per sample. It is given by the DDC type used for DDC1 and it can be 16 or 32. If it is 16, the sample is 16bit integer (32bits per I/Q sample set), signed, little endian, from the range -32768 to 32767. If it is 32, the sample is 32bit integer (64bits per I/Q sample set), signed, little endian, from the range -2147483648 to 2147483647.UserDataUser-defined data. This is the value passed to the CohSetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as a ADC snapshot callback. It is called by the API to pass ADC snapshots from the specified device of the device set to the application. Sending of ADC snapshots is started using the CohStartADCSnapshots function.
C/C++ declaration
void __stdcall ADCSnapshotCallback(UINT32 DeviceIndex,const short *Buffer,UINT32 Count,UINT32 CenterFrequency,WORD ADCLevel,DWORD_PTR UserData);Parameters
DeviceIndexSpecifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.BufferPointer to the buffer which contains samples directly received from the ADC. Sample rate is 210 MHz, the sample is 16bit signed little endian.CountSpecifies the number of samples in the buffer pointed to by the Buffer parameter. This depends on the SamplesPerSnapshot parameter of the CohStartADCSnapshots function.CenterFrequencySpecifies the center frequency of the useful band in the received 105 MHz wide snapshot. Not all of the 105 MHz band of the snapshot is usable. Usable bandwidth depends on the selected receiver's input range and is given by the difference of the MaxFrequency and MinFrequency of the Ranges member of the G65DDC_DEVICE_INFO structure.ADCLevelSpecifies the maximum amplitude. Measurement of the maximum is started at the end of the previous snapshot to the current one. The possible value ranges from 0 to 32767. The value 32767 means ADC clipping.UserDataUser-defined data. This is the value passed to the CohSetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as DDC2 stream callback. It is called by the API to pass I/Q samples from DDC2 to the application. The DDC2 streaming can be started using the CohStartDDC2 function.
C/C++ declaration
void __stdcall DDC2StreamCallback(UINT32 DeviceIndex,const float *Buffer,UINT32 Count,DWORD_PTR UserData);Parameters
DeviceIndexSpecifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.BufferPointer to the buffer which contains I/Q sample sets from DDC2. Sample rate is given by the used DDC type, see the CohSetDDC2 function. Sample is 32bit IEEE float from range -1.0 to 1.0. One I/Q sample set consists of two samples.CountSpecifies the number of I/Q sample sets in the buffer pointed to by the Buffer parameter. This value is equal to value of the SampleSetsPerBuffer parameter of the CohStartDDC2 function.UserDataUser-defined data. This is the value passed to the CohSetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as pre-processed DDC2 stream callback. It is called by the API to pass preprocessed I/Q samples from DDC2 of device to the application. The samples are filtered by the demodulator filter, notch filter and affected by AGC or fixed gain. The DDC2 streaming can be started using the CohStartDDC2 function.
C/C++ declaration
void __stdcall DDC2PreprocessedStreamCallback(UINT32 DeviceIndex,const float *Buffer,UINT32 Count,float SlevelPeak,float SlevelRMS,DWORD_PTR UserData);Parameters
DeviceIndexSpecifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.BufferPointer to the buffer which contains preprocessed I/Q sample sets from DDC2. Sample rate is given by the used DDC type, see the CohSetDDC2 function. Sample is 32bit IEEE float from range -1.0 to 1.0. One I/Q sample set consists of two samples.CountSpecifies number of I/Q sample sets in the buffer pointed to by the Buffer parameter. This value is equal to value of the SampleSetsPerBuffer parameter of the CohStartDDC2 function.SlevelPeakSpecifies the peak signal level in Volts evaluated from samples stored in the buffer pointed to by the Buffer parameter.SlevelRMSSpecifies the RMS signal level in Volts evaluated from samples stored in the buffer pointed to by the Buffer parameter. For detailed information on how to convert RMS signal level to dBm, see the remarks of the CohGetSignalLevel function.UserDataUser-defined data. This is the value passed to the CohSetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as audio stream callback. It is called by the API to pass audio samples from the device of the device set to the application. The audio streaming is started using the CohStartAudio function. The callback is invoked three times for each audio buffer (see description of the Stage parameter).
C/C++ declaration
void __stdcall AudioStreamCallback(UINT32 DeviceIndex,UINT32 Stage,const float *Buffer,UINT32 Count,DWORD_PTR UserData);Parameters
DeviceIndexSpecifies the index of the device in the device set. It can vary from zero to 'one less than number of devices' in the device set.StageSpecifies the stage of audio samples stored in the buffer pointed to by the Buffer parameter. The value of this parameter can be one of the following:
Value Meaning G65DDC_AUDIO_STREAM_CALLBACK_STAGE_0 The buffer contains audio samples affected by audio gain (see CohSetAudioGain). G65DDC_AUDIO_STREAM_CALLBACK_STAGE_1 The buffer contains audio samples affected by audio gain and audio filter (see CohSetAudioGain and CohSetAudioFilter). G65DDC_AUDIO_STREAM_CALLBACK_STAGE_2 The buffer contains audio samples affected by audio gain, audio filter and volume (see CohSetAudioGain, CohSetAudioFilter, CohSetVolume and CohSetMute). BufferPointer to the buffer which contains samples of the audio signal. The audio signal consists of two channels (interleaved), the sample rate is 48000 Hz, each sample is 32-bit IEEE float from the range of -1.0 to 1.0.CountSpecifies the number of sample sets stored in the buffer pointed to by the Buffer parameter. This value is equal to the value of the SampleSetsPerBuffer parameter of the CohStartAudio function.UserDataUser-defined data. This is the value passed to the CohSetCallbacks function as the UserData parameter.
Contains information about the DRM demodulator/decoder status.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
BOOL Valid;
struct
{
BOOL SyncFound;
BOOL FACDecoded;
BOOL SDCDecoded;
BOOL AudioDecoded;
SHORT NumberOfAudioFrames;
SHORT NumberOfAudioErrors;
} DecodingState;
INT32 Mode;
double RFBandwidth;
BYTE Interleaver;
SHORT SDCQam;
SHORT MSCQam;
BYTE MSCQamType;
double CoderateH;
double CoderateA;
double CoderateB;
double EstimatedSNR;
WCHAR TextMessage[128 + 1 + 16];
struct
{
BYTE Content;
WCHAR DynamicLabel[256];
WCHAR Country[256];
WCHAR Language[256];
WCHAR ProgramType[256];
double AudioBitrate;
double TextMsgBitrate;
double MultimediaBitrate;
double DataBitrate;
} ServiceInfo[4];
struct
{
BOOL Valid;
BYTE AudioCoding;
BOOL SBR;
INT32 AudioMode;
} AudioDecoderInfo[4];
} G65DDC_DRM_STATUS;
#pragma pack(pop)
Members
ValidThe value is non-zero if the content of the structure is valid. It is zero if the content of the structure is invalid.DecodingStateStructure that contains the status of the decoder modules.
Members
SyncFoundStatus of the sync detection. It is non-zero if sync is detected.FACDecodedStatus of the FAC decoder. It is non-zero if FAC is decoded.SDCDecodedStatus of the SDC decoder. It is non-zero if SDC is decoded.AudioDecodedStatus of the audio decoder. It is non-zero if audio is decoded.NumberOfAudioFramesNumber of audio frames in the transmission frame. It is -1 if this information is not available.NumberOfAudioErrorsNumber of audio frames that were invalid.ModeThe DRM robustness mode employed can be one of the following:
Value Meaning G65DDC_DRM_STATE_MODE_NOT_DETERMINED_YET Robustness mode is not determined yet. G65DDC_DRM_STATE_MODE_A Broadcast is using DRM robustness mode A. G65DDC_DRM_STATE_MODE_B DRM robustness mode B. G65DDC_DRM_STATE_MODE_C DRM robustness mode C. G65DDC_DRM_STATE_MODE_D DRM robustness mode D. RFBandwidthOccupied RF bandwidth in kHz. It is zero if it is invalid, or this information is not available (yet).InterleaverThe Interleaver length can be one of the following:
Value Meaning G65DDC_DRM_STATE_INTERLEAVER_LONG Long interleaver used (2 sec). G65DDC_DRM_STATE_INTERLEAVER_SHORT Short interleaver used (400 msec). SDCQamCoding of the SDC (QAM). It is zero if this information is not available (yet).MSCQamCoding of the MSC (QAM). It is zero if this information is not available (yet).MSCQamTypeThe QAM coding used for the MSC can be one of the following:
Value Meaning G65DDC_DRM_STATE_QAM_TYPE_STD Standard G65DDC_DRM_STATE_QAM_TYPE_HIER_SYM Hierarchical symmetrical G65DDC_DRM_STATE_QAM_TYPE_HIER_MIX Hierarchical mixed CoderateHUsed code-rate for hierarchical coding, values less than or equal to zero indicate not available or not used.CoderateAUsed code-rate for protection level A, values less than or equal to zero indicate not available or not used.CoderateBUsed code-rate for protection level B, values less than or equal to zero indicate not available or not used.EstimatedSNREstimated SNR in dB of the decoded signal.TextMessageDecoded text message for the selected service in 16-bit Unicode null-terminated string.ServiceInfoArray of four structures which contain general information about the services.
Members
ContentThe type of the service can be a combination of the following:
Value Meaning G65DDC_DRM_STATE_SERVICE_CONTENT_EMPTY Given service is not used, it contains no data, all other members of the structure are invalid. G65DDC_DRM_STATE_SERVICE_CONTENT_AUDIO Given service contains audio data. G65DDC_DRM_STATE_SERVICE_CONTENT_TEXTMSG Given service contains text messages. G65DDC_DRM_STATE_SERVICE_CONTENT_MULTIMEDIA Given service contains multimedia data. G65DDC_DRM_STATE_SERVICE_CONTENT_DATA Given service contains application specific data. DynamicLabel16-bit Unicode null-terminated string containing a dynamic label of the service.Country16-bit Unicode null-terminated string containing the signaled country for this service.Language16-bit Unicode null-terminated string containing the signaled language for this service.ProgramType16-bit Unicode null-terminated string containing the signaled program type for this service.AudioBitrateData rate for the audio content. It is zero if this information is not available.TextMsgBitrateData rate for the text message content. It is zero if this information is not available.MultimediaBitrateData rate for the multimedia content. It is zero if this information is not available.DataBitrateData rate for the data content. It is zero if this information is not available.AudioDecoderInfoArray of four structures which contain audio decoder specific information about the services.
Members
ValidIf it is non-zero, the audio decoder information is valid, if it is zero, the audio decoder information is invalid and all other members of the structure contain no valid data.AudioCodingThe audio coding employed can be one of the following:
Value Meaning G65DDC_DRM_STATE_AUDIO_CODING_AAC Audio coding for the given service is AAC. G65DDC_DRM_STATE_AUDIO_CODING_CELP Audio coding for the given service is CELP. G65DDC_DRM_STATE_AUDIO_CODING_HVXC Audio coding for the given service is HVXC. G65DDC_DRM_STATE_AUDIO_CODING_RFU Reserved for future use. SBRIf it is non-zero, SBR is used, if it is zero, SBR is not used.AudioModeThe value depends upon the audio coding and can be one of the following:
Value Meaning G65DDC_DRM_STATE_AUDIO_MODE_AAC_MONO Mono G65DDC_DRM_STATE_AUDIO_MODE_AAC_PARAM_STEREO Parametric stereo G65DDC_DRM_STATE_AUDIO_MODE_AAC_STEREO Stereo G65DDC_DRM_STATE_AUDIO_MODE_AAC_RFU Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_CELP_NO_CRC Audio data is without CRC G65DDC_DRM_STATE_AUDIO_MODE_CELP_CRC CRC used G65DDC_DRM_STATE_AUDIO_MODE_CELP_RFU_10 Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_CELP_RFU_11 Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_00 Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_01 Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_10 Reserved for future use G65DDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_11 Reserved for future use