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DSD demod: use buffered squelch to start decoding at the very beginning of the transmission regardless of squelch gate length

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This commit is contained in:
f4exb 2018-04-21 09:56:12 +02:00
parent 12f5f4e30c
commit 84538f1acf
2 changed files with 218 additions and 211 deletions
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10
plugins/channelrx/demoddsd/dsddemod.cpp
View File

@ -50,6 +50,7 @@ DSDDemod::DSDDemod(DeviceSourceAPI *deviceAPI) :
m_squelchGate(0),
m_squelchLevel(1e-4),
m_squelchOpen(false),
m_squelchDelayLine(24000),
m_audioFifo1(48000),
m_audioFifo2(48000),
m_scopeXY(0),
@ -143,6 +144,8 @@ void DSDDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
if (m_movingAverage.asDouble() > m_squelchLevel)
{
m_squelchDelayLine.write(demod);
if (m_squelchGate > 0)
{
if (m_squelchCount < m_squelchGate) {
@ -158,14 +161,17 @@ void DSDDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
}
else
{
m_squelchDelayLine.write(0);
m_squelchCount = 0;
m_squelchOpen = false;
}
if (m_squelchOpen)
{
sampleDSD = demod * 32768.0f; // DSD decoder takes int16 samples
sample = demod * SDR_RX_SCALEF; // scale to sample size
sampleDSD = m_squelchDelayLine.readBack(m_squelchGate) * 32768.0f; // DSD decoder takes int16 samples
sample = m_squelchDelayLine.readBack(m_squelchGate) * SDR_RX_SCALEF; // scale to sample size
// sampleDSD = demod * 32768.0f; // DSD decoder takes int16 samples
// sample = demod * SDR_RX_SCALEF; // scale to sample size
}
else
{

3
plugins/channelrx/demoddsd/dsddemod.h
View File

@ -34,6 +34,7 @@
#include "audio/audiofifo.h"
#include "util/message.h"
#include "util/udpsink.h"
#include "util/doublebufferfifo.h"
#include "dsddemodsettings.h"
#include "dsddecoder.h"
@ -172,9 +173,9 @@ private:
int m_sampleCount;
int m_squelchCount;
int m_squelchGate;
double m_squelchLevel;
bool m_squelchOpen;
DoubleBufferFIFO<Real> m_squelchDelayLine;
MovingAverageUtil<Real, double, 16> m_movingAverage;
double m_magsq;