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Attempt to fix AF squelch

This commit is contained in:
f4exb 2017-05-31 00:30:00 +02:00
parent c8bd0e8e85
commit db1a620fc2
3 changed files with 55 additions and 28 deletions
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4
plugins/channelrx/demodnfm/nfmdemod.cpp
View File

@ -27,7 +27,7 @@
#include "dsp/dspengine.h"
#include "nfmdemodgui.h"
static const double afSqTones[2] = {1200.0, 8000.0}; // {1200.0, 8000.0};
static const double afSqTones[2] = {1000.0, 6000.0}; // {1200.0, 8000.0};
MESSAGE_CLASS_DEFINITION(NFMDemod::MsgConfigureNFMDemod, Message)
@ -75,7 +75,7 @@ NFMDemod::NFMDemod() :
m_movingAverage.resize(32, 0);
m_ctcssDetector.setCoefficients(3000, 6000.0); // 0.5s / 2 Hz resolution
m_afSquelch.setCoefficients(24, 600, 48000.0, 200, 0); // 0.5ms test period, 300ms average span, 48kS/s SR, 100ms attack, no decay
m_afSquelch.setCoefficients(24, 60, 48000.0, 20, 0); // 0.5ms test period, 30ms average span, 48kS/s SR, 10ms attack, no decay
DSPEngine::instance()->addAudioSink(&m_audioFifo);
}

78
sdrbase/dsp/afsquelch.cpp
View File

@ -29,6 +29,7 @@ AFSquelch::AFSquelch() :
m_attackCount(0),
m_samplesDecay(0),
m_decayCount(0),
m_squelchCount(0),
m_isOpen(false),
m_threshold(0.0)
{
@ -65,6 +66,7 @@ AFSquelch::AFSquelch(unsigned int nbTones, const double *tones) :
m_attackCount(0),
m_samplesDecay(0),
m_decayCount(0),
m_squelchCount(0),
m_isOpen(false),
m_threshold(0.0)
{
@ -117,6 +119,7 @@ void AFSquelch::setCoefficients(
m_maxPowerIndex = 0;
m_attackCount = 0;
m_decayCount = 0;
m_squelchCount = 0;
m_isOpen = false;
m_threshold = 0.0;
@ -239,32 +242,55 @@ bool AFSquelch::evaluate()
}
}
if ((minPower/maxPower < m_threshold) && (minIndex > maxIndex)) // open condition
{
if ((m_samplesAttack > 0) && (m_attackCount < m_samplesAttack))
{
m_isOpen = false;
m_attackCount++;
}
else
{
m_isOpen = true;
m_decayCount = 0;
}
}
else
{
if ((m_samplesDecay > 0) && (m_decayCount < m_samplesDecay))
{
m_isOpen = true;
m_decayCount++;
}
else
{
m_isOpen = false;
m_attackCount = 0;
}
}
// m_isOpen = ((minPower/maxPower < m_threshold) && (minIndex > maxIndex));
if ((minPower/maxPower < m_threshold) && (minIndex > maxIndex)) // open condition
{
if (m_squelchCount < m_samplesAttack + m_samplesDecay)
{
m_squelchCount++;
}
}
else
{
if (m_squelchCount > m_samplesAttack)
{
m_squelchCount--;
}
else
{
m_squelchCount = 0;
}
}
m_isOpen = (m_squelchCount >= m_samplesAttack) ;
// if ((minPower/maxPower < m_threshold) && (minIndex > maxIndex)) // open condition
// {
// if ((m_samplesAttack > 0) && (m_attackCount < m_samplesAttack))
// {
// m_isOpen = false;
// m_attackCount++;
// }
// else
// {
// m_isOpen = true;
// m_decayCount = 0;
// }
// }
// else
// {
// if ((m_samplesDecay > 0) && (m_decayCount < m_samplesDecay))
// {
// m_isOpen = true;
// m_decayCount++;
// }
// else
// {
// m_isOpen = false;
// m_attackCount = 0;
// }
// }
return m_isOpen;
}

1
sdrbase/dsp/afsquelch.h
View File

@ -76,6 +76,7 @@ private:
unsigned int m_attackCount;
unsigned int m_samplesDecay;
unsigned int m_decayCount;
unsigned int m_squelchCount;
bool m_isOpen;
double m_threshold;
double *m_k;