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Common static function to calculate device center frequency from all contributing parameters

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This commit is contained in:
f4exb 2018-05-10 11:47:13 +02:00
parent 1fadbf3b8a
commit fd4d2bb64f
2 changed files with 57 additions and 0 deletions
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43
sdrbase/dsp/devicesamplesource.cpp
View File

@ -15,6 +15,7 @@
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <QDebug>
#include <dsp/devicesamplesource.h>
DeviceSampleSource::DeviceSampleSource() :
@ -39,3 +40,45 @@ void DeviceSampleSource::handleInputMessages()
}
}
}
qint64 DeviceSampleSource::calculateDeviceCenterFrequency(
quint64 centerFrequency,
qint64 transverterDeltaFrequency,
int log2Decim,
fcPos_t fcPos,
quint32 devSampleRate,
bool transverterMode)
{
qint64 deviceCenterFrequency = centerFrequency;
deviceCenterFrequency -= transverterMode ? transverterDeltaFrequency : 0;
deviceCenterFrequency = deviceCenterFrequency < 0 ? 0 : deviceCenterFrequency;
qint64 f_img = deviceCenterFrequency;
if ((log2Decim == 0) || (fcPos == FC_POS_CENTER))
{
f_img = deviceCenterFrequency;
}
else
{
if (fcPos == FC_POS_INFRA)
{
deviceCenterFrequency += (devSampleRate / 4);
f_img = deviceCenterFrequency + devSampleRate/2;
}
else if (fcPos == FC_POS_SUPRA)
{
deviceCenterFrequency -= (devSampleRate / 4);
f_img = deviceCenterFrequency - devSampleRate/2;
}
}
qDebug() << "DeviceSampleSource::calculateDeviceCenterFrequency:"
<< " desired center freq: " << centerFrequency << " Hz"
<< " device center freq: " << deviceCenterFrequency << " Hz"
<< " device sample rate: " << devSampleRate << "S/s"
<< " Actual sample rate: " << devSampleRate/(1<<log2Decim) << "S/s"
<< " center freq position code: " << fcPos
<< " image frequency: " << f_img << "Hz";
return deviceCenterFrequency;
}

14
sdrbase/dsp/devicesamplesource.h
View File

@ -35,6 +35,12 @@ namespace SWGSDRangel
class SDRBASE_API DeviceSampleSource : public QObject {
Q_OBJECT
public:
typedef enum {
FC_POS_INFRA = 0,
FC_POS_SUPRA,
FC_POS_CENTER
} fcPos_t;
DeviceSampleSource();
virtual ~DeviceSampleSource();
virtual void destroy() = 0;
@ -80,6 +86,14 @@ public:
MessageQueue *getMessageQueueToGUI() { return m_guiMessageQueue; }
SampleSinkFifo* getSampleFifo() { return &m_sampleFifo; }
static qint64 calculateDeviceCenterFrequency(
quint64 centerFrequency,
qint64 transverterDeltaFrequency,
int log2Decim,
fcPos_t fcPos,
quint32 devSampleRate,
bool transverterMode = false);
protected slots:
void handleInputMessages();