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NFM demod: fixed squelch

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This commit is contained in:
f4exb 2018-05-02 01:22:34 +02:00
parent c7db2a3ca7
commit 1db2da3b60
3 changed files with 52 additions and 47 deletions
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16
plugins/channelrx/demodnfm/nfmdemod.cpp
View File

@ -57,7 +57,6 @@ NFMDemod::NFMDemod(DeviceSourceAPI *devieAPI) :
m_sampleCount(0),
m_squelchCount(0),
m_squelchGate(4800),
m_squelchDecay(4800),
m_squelchLevel(-990),
m_squelchOpen(false),
m_afSquelchOpen(false),
@ -192,7 +191,7 @@ void NFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
{
m_squelchDelayLine.write(demod * m_discriCompensation);
if (m_squelchCount < m_squelchGate + m_squelchDecay) {
if (m_squelchCount < 2*m_squelchGate) {
m_squelchCount++;
}
}
@ -219,15 +218,21 @@ void NFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
{
m_squelchDelayLine.write(demod * m_discriCompensation);
if (m_squelchCount < m_squelchGate + m_squelchDecay) {
if (m_squelchCount < 2*m_squelchGate) {
m_squelchCount++;
}
}
}
if (m_settings.m_audioMute)
{
sample = 0;
}
else
{
m_squelchOpen = (m_squelchCount > m_squelchGate);
if ((m_squelchOpen) && !m_settings.m_audioMute)
if (m_squelchOpen)
{
if (m_settings.m_ctcssOn)
{
@ -288,6 +293,8 @@ void NFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
sample = 0;
}
}
m_audioBuffer[m_audioBufferFill].l = sample;
m_audioBuffer[m_audioBufferFill].r = sample;
@ -421,7 +428,6 @@ void NFMDemod::applyAudioSampleRate(int sampleRate)
m_lowpass.create(301, sampleRate, 250.0);
m_bandpass.create(301, sampleRate, 300.0, m_settings.m_afBandwidth);
m_squelchGate = (sampleRate / 100) * m_settings.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
m_squelchDecay = m_squelchGate;
m_squelchCount = 0; // reset squelch open counter
m_ctcssDetector.setCoefficients(sampleRate/16, sampleRate/8.0f); // 0.5s / 2 Hz resolution

1
plugins/channelrx/demodnfm/nfmdemod.h
View File

@ -195,7 +195,6 @@ private:
int m_sampleCount;
int m_squelchCount;
int m_squelchGate;
int m_squelchDecay;
Real m_squelchLevel;
bool m_squelchOpen;

2
plugins/channelrx/demodnfm/nfmplugin.cpp
View File

@ -9,7 +9,7 @@
const PluginDescriptor NFMPlugin::m_pluginDescriptor = {
QString("NFM Demodulator"),
QString("3.14.4"),
QString("3.14.5"),
QString("(c) Edouard Griffiths, F4EXB"),
QString("https://github.com/f4exb/sdrangel"),
true,