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WFM demod: fixed excursion handling. Changed discriminator

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This commit is contained in:
f4exb 2017-04-26 04:33:25 +02:00
parent 137647e2ca
commit faffb7f7ca
2 changed files with 28 additions and 44 deletions
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70
plugins/channelrx/demodwfm/wfmdemod.cpp
View File

@ -76,7 +76,9 @@ void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
Complex ci;
fftfilt::cmplx *rf;
int rf_out;
Real msq, demod;
Real demod;
double msq;
float fmDev;
m_settingsMutex.lock();
@ -89,7 +91,7 @@ void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
for (int i =0 ; i <rf_out; i++)
{
msq = rf[i].real()*rf[i].real() + rf[i].imag()*rf[i].imag();
demod = m_phaseDiscri.phaseDiscriminatorDelta(rf[i], msq, fmDev);
m_movingAverage.feed(msq);
@ -99,17 +101,6 @@ void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
if(m_squelchState > 0)
{
m_squelchState--;
// Alternative without atan
// http://www.embedded.com/design/configurable-systems/4212086/DSP-Tricks--Frequency-demodulation-algorithms-
// in addition it needs scaling by instantaneous magnitude squared and volume (0..10) adjustment factor
/*
Real ip = rf[i].real() - m_m2Sample.real();
Real qp = rf[i].imag() - m_m2Sample.imag();
Real h1 = m_m1Sample.real() * qp;
Real h2 = m_m1Sample.imag() * ip;
demod = (h1 - h2) / (msq * 10.0);*/
demod = m_phaseDiscri.phaseDiscriminator2(rf[i]);
}
else
{
@ -120,7 +111,7 @@ void WFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
if(m_interpolator.decimate(&m_interpolatorDistanceRemain, e, &ci))
{
quint16 sample = (qint16)(ci.real() * 3000 * m_running.m_volume);
quint16 sample = (qint16)(ci.real() * 3276.8f * m_running.m_volume);
m_sampleBuffer.push_back(Sample(sample, sample));
m_audioBuffer[m_audioBufferFill].l = sample;
m_audioBuffer[m_audioBufferFill].r = sample;
@ -178,8 +169,6 @@ void WFMDemod::stop()
bool WFMDemod::handleMessage(const Message& cmd)
{
qDebug() << "WFMDemod::handleMessage";
if (DownChannelizer::MsgChannelizerNotification::match(cmd))
{
DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
@ -187,10 +176,10 @@ bool WFMDemod::handleMessage(const Message& cmd)
m_config.m_inputSampleRate = notif.getSampleRate();
m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
apply();
qDebug() << "WFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << m_config.m_inputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
qDebug() << "WFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << m_config.m_inputSampleRate
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
apply();
return true;
}
@ -203,12 +192,12 @@ bool WFMDemod::handleMessage(const Message& cmd)
m_config.m_volume = cfg.getVolume();
m_config.m_squelch = cfg.getSquelch();
apply();
qDebug() << "WFMDemod::handleMessage: MsgConfigureWFMDemod: m_rfBandwidth: " << m_config.m_rfBandwidth
<< " m_afBandwidth: " << m_config.m_afBandwidth
<< " m_volume: " << m_config.m_volume
<< " m_squelch: " << m_config.m_squelch;
qDebug() << "WFMDemod::handleMessage: MsgConfigureWFMDemod: m_rfBandwidth: " << m_config.m_rfBandwidth
<< " m_afBandwidth: " << m_config.m_afBandwidth
<< " m_volume: " << m_config.m_volume
<< " m_squelch: " << m_config.m_squelch;
apply();
return true;
}
@ -231,38 +220,33 @@ void WFMDemod::apply()
if((m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset) ||
(m_config.m_inputSampleRate != m_running.m_inputSampleRate))
{
qDebug() << "WFMDemod::handleMessage: m_nco.setFreq";
qDebug() << "WFMDemod::apply: m_nco.setFreq";
m_nco.setFreq(-m_config.m_inputFrequencyOffset, m_config.m_inputSampleRate);
}
if((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
(m_config.m_audioSampleRate != m_running.m_audioSampleRate) ||
(m_config.m_afBandwidth != m_running.m_afBandwidth))
{
m_settingsMutex.lock();
qDebug() << "WFMDemod::handleMessage: m_interpolator.create";
m_interpolator.create(16, m_config.m_inputSampleRate, m_config.m_afBandwidth);
m_interpolatorDistanceRemain = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
m_settingsMutex.unlock();
}
if((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
(m_config.m_afBandwidth != m_running.m_afBandwidth) ||
(m_config.m_rfBandwidth != m_running.m_rfBandwidth))
{
m_settingsMutex.lock();
qDebug() << "WFMDemod::handleMessage: m_rfFilter->create_filter";
Real lowCut = -(m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
Real hiCut = (m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
m_rfFilter->create_filter(lowCut, hiCut);
m_fmExcursion = m_config.m_rfBandwidth / 2.0;
m_phaseDiscri.setFMScaling(m_config.m_inputSampleRate / m_fmExcursion);
qDebug() << "WFMDemod::apply: m_interpolator.create";
m_interpolator.create(16, m_config.m_inputSampleRate, m_config.m_afBandwidth);
m_interpolatorDistanceRemain = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
qDebug() << "WFMDemod::apply: m_rfFilter->create_filter";
Real lowCut = -(m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
Real hiCut = (m_config.m_rfBandwidth / 2.0) / m_config.m_inputSampleRate;
m_rfFilter->create_filter(lowCut, hiCut);
m_fmExcursion = m_config.m_rfBandwidth / (Real) m_config.m_inputSampleRate;
m_phaseDiscri.setFMScaling(1.0f/m_fmExcursion);
qDebug("WFMDemod::apply: m_fmExcursion: %f", m_fmExcursion);
m_settingsMutex.unlock();
}
if(m_config.m_squelch != m_running.m_squelch)
{
qDebug() << "WFMDemod::handleMessage: set m_squelchLevel";
qDebug() << "WFMDemod::apply: set m_squelchLevel";
m_squelchLevel = pow(10.0, m_config.m_squelch / 20.0);
m_squelchLevel *= m_squelchLevel;
}

2
plugins/channelrx/demodwfm/wfmdemod.h
View File

@ -120,7 +120,7 @@ private:
int m_squelchState;
Real m_lastArgument;
MovingAverage<Real> m_movingAverage;
MovingAverage<double> m_movingAverage;
Real m_fmExcursion;
AudioVector m_audioBuffer;