mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-15 12:51:49 -05:00
426 lines
12 KiB
C++
426 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
|
|
// written by Christian Daniel //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "../../channelrx/demodnfm/nfmdemod.h"
|
|
|
|
#include <QTime>
|
|
#include <QDebug>
|
|
#include <stdio.h>
|
|
#include <complex.h>
|
|
#include <dsp/downchannelizer.h>
|
|
#include "audio/audiooutput.h"
|
|
#include "dsp/pidcontroller.h"
|
|
#include "dsp/dspengine.h"
|
|
#include "../../channelrx/demodnfm/nfmdemodgui.h"
|
|
|
|
static const Real afSqTones[2] = {1200.0, 6400.0}; // {1200.0, 8000.0};
|
|
|
|
MESSAGE_CLASS_DEFINITION(NFMDemod::MsgConfigureNFMDemod, Message)
|
|
|
|
NFMDemod::NFMDemod() :
|
|
m_ctcssIndex(0),
|
|
m_sampleCount(0),
|
|
m_squelchCount(0),
|
|
m_squelchGate(2400),
|
|
m_audioMute(false),
|
|
m_squelchOpen(false),
|
|
m_magsq(0.0f),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_afSquelch(2, afSqTones),
|
|
m_audioFifo(4, 48000),
|
|
m_fmExcursion(2400),
|
|
m_settingsMutex(QMutex::Recursive)
|
|
{
|
|
setObjectName("NFMDemod");
|
|
|
|
m_config.m_inputSampleRate = 96000;
|
|
m_config.m_inputFrequencyOffset = 0;
|
|
m_config.m_rfBandwidth = 12500;
|
|
m_config.m_afBandwidth = 3000;
|
|
m_config.m_fmDeviation = 2000;
|
|
m_config.m_squelchGate = 5; // 10s of ms at 48000 Hz sample rate. Corresponds to 2400 for AGC attack
|
|
m_config.m_deltaSquelch = false;
|
|
m_config.m_squelch = -30.0;
|
|
m_config.m_volume = 1.0;
|
|
m_config.m_ctcssOn = false;
|
|
m_config.m_audioMute = false;
|
|
m_config.m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
|
|
|
|
apply();
|
|
|
|
m_audioBuffer.resize(1<<14);
|
|
m_audioBufferFill = 0;
|
|
|
|
m_agcLevel = 1.0;
|
|
m_AGC.resize(m_squelchGate, m_agcLevel);
|
|
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); // 4000 Hz span, 250us, 100ms attack
|
|
|
|
DSPEngine::instance()->addAudioSink(&m_audioFifo);
|
|
}
|
|
|
|
NFMDemod::~NFMDemod()
|
|
{
|
|
DSPEngine::instance()->removeAudioSink(&m_audioFifo);
|
|
}
|
|
|
|
void NFMDemod::configure(MessageQueue* messageQueue,
|
|
Real rfBandwidth,
|
|
Real afBandwidth,
|
|
int fmDeviation,
|
|
Real volume,
|
|
int squelchGate,
|
|
bool deltaSquelch,
|
|
Real squelch,
|
|
bool ctcssOn,
|
|
bool audioMute)
|
|
{
|
|
Message* cmd = MsgConfigureNFMDemod::create(rfBandwidth,
|
|
afBandwidth,
|
|
fmDeviation,
|
|
volume,
|
|
squelchGate,
|
|
deltaSquelch,
|
|
squelch,
|
|
ctcssOn,
|
|
audioMute);
|
|
messageQueue->push(cmd);
|
|
}
|
|
|
|
float arctan2(Real y, Real x)
|
|
{
|
|
Real coeff_1 = M_PI / 4;
|
|
Real coeff_2 = 3 * coeff_1;
|
|
Real abs_y = fabs(y) + 1e-10; // kludge to prevent 0/0 condition
|
|
Real angle;
|
|
if( x>= 0) {
|
|
Real r = (x - abs_y) / (x + abs_y);
|
|
angle = coeff_1 - coeff_1 * r;
|
|
} else {
|
|
Real r = (x + abs_y) / (abs_y - x);
|
|
angle = coeff_2 - coeff_1 * r;
|
|
}
|
|
if(y < 0)
|
|
return(-angle);
|
|
else return(angle);
|
|
}
|
|
|
|
Real angleDist(Real a, Real b)
|
|
{
|
|
Real dist = b - a;
|
|
|
|
while(dist <= M_PI)
|
|
dist += 2 * M_PI;
|
|
while(dist >= M_PI)
|
|
dist -= 2 * M_PI;
|
|
|
|
return dist;
|
|
}
|
|
|
|
void NFMDemod::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool firstOfBurst)
|
|
{
|
|
Complex ci;
|
|
|
|
m_settingsMutex.lock();
|
|
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
//Complex c(it->real() / 32768.0f, it->imag() / 32768.0f);
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
{
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
|
|
qint16 sample;
|
|
|
|
//m_AGC.feed(ci);
|
|
|
|
//double magsqRaw = m_AGC.getMagSq();
|
|
long double magsqRaw; // = ci.real()*ci.real() + c.imag()*c.imag();
|
|
Real deviation;
|
|
|
|
Real demod = m_phaseDiscri.phaseDiscriminatorDelta(ci, magsqRaw, deviation);
|
|
|
|
Real magsq = magsqRaw / (1<<30);
|
|
m_movingAverage.feed(magsq);
|
|
m_magsqSum += magsq;
|
|
|
|
if (magsq > m_magsqPeak)
|
|
{
|
|
m_magsqPeak = magsq;
|
|
}
|
|
|
|
m_magsqCount++;
|
|
|
|
//m_m2Sample = m_m1Sample;
|
|
//m_m1Sample = ci;
|
|
m_sampleCount++;
|
|
|
|
// AF processing
|
|
|
|
if ( (m_running.m_deltaSquelch && ((deviation > m_squelchLevel) || (deviation < -m_squelchLevel))) ||
|
|
(!m_running.m_deltaSquelch && (m_movingAverage.average() < m_squelchLevel)) )
|
|
{
|
|
if (m_squelchCount < m_squelchGate)
|
|
{
|
|
m_squelchCount = 0; // return to 0
|
|
}
|
|
else
|
|
{
|
|
m_squelchCount--; // grace period
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (m_squelchCount < m_squelchGate + 2)
|
|
{
|
|
m_squelchCount++;
|
|
}
|
|
}
|
|
|
|
//squelchOpen = (getMag() > m_squelchLevel);
|
|
m_squelchOpen = m_squelchCount >= m_squelchGate; // wait for AGC to stabilize
|
|
|
|
/*
|
|
if (m_afSquelch.analyze(demod))
|
|
{
|
|
squelchOpen = m_afSquelch.evaluate();
|
|
}*/
|
|
|
|
if ((m_squelchOpen) && !m_running.m_audioMute)
|
|
//if (m_AGC.getAverage() > m_squelchLevel)
|
|
{
|
|
if (m_running.m_ctcssOn)
|
|
{
|
|
Real ctcss_sample = m_lowpass.filter(demod);
|
|
|
|
if ((m_sampleCount & 7) == 7) // decimate 48k -> 6k
|
|
{
|
|
if (m_ctcssDetector.analyze(&ctcss_sample))
|
|
{
|
|
int maxToneIndex;
|
|
|
|
if (m_ctcssDetector.getDetectedTone(maxToneIndex))
|
|
{
|
|
if (maxToneIndex+1 != m_ctcssIndex)
|
|
{
|
|
m_nfmDemodGUI->setCtcssFreq(m_ctcssDetector.getToneSet()[maxToneIndex]);
|
|
m_ctcssIndex = maxToneIndex+1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (m_ctcssIndex != 0)
|
|
{
|
|
m_nfmDemodGUI->setCtcssFreq(0);
|
|
m_ctcssIndex = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (m_running.m_ctcssOn && m_ctcssIndexSelected && (m_ctcssIndexSelected != m_ctcssIndex))
|
|
{
|
|
sample = 0;
|
|
}
|
|
else
|
|
{
|
|
demod = m_bandpass.filter(demod);
|
|
sample = demod * m_running.m_volume;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (m_ctcssIndex != 0)
|
|
{
|
|
m_nfmDemodGUI->setCtcssFreq(0);
|
|
m_ctcssIndex = 0;
|
|
}
|
|
|
|
sample = 0;
|
|
}
|
|
|
|
m_audioBuffer[m_audioBufferFill].l = sample;
|
|
m_audioBuffer[m_audioBufferFill].r = sample;
|
|
++m_audioBufferFill;
|
|
|
|
if (m_audioBufferFill >= m_audioBuffer.size())
|
|
{
|
|
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 10);
|
|
|
|
if (res != m_audioBufferFill)
|
|
{
|
|
qDebug("NFMDemod::feed: %u/%u audio samples written", res, m_audioBufferFill);
|
|
}
|
|
|
|
m_audioBufferFill = 0;
|
|
}
|
|
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (m_audioBufferFill > 0)
|
|
{
|
|
uint res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], m_audioBufferFill, 10);
|
|
|
|
if (res != m_audioBufferFill)
|
|
{
|
|
qDebug("NFMDemod::feed: %u/%u tail samples written", res, m_audioBufferFill);
|
|
}
|
|
|
|
m_audioBufferFill = 0;
|
|
}
|
|
|
|
m_settingsMutex.unlock();
|
|
}
|
|
|
|
void NFMDemod::start()
|
|
{
|
|
m_audioFifo.clear();
|
|
m_phaseDiscri.reset();
|
|
}
|
|
|
|
void NFMDemod::stop()
|
|
{
|
|
}
|
|
|
|
bool NFMDemod::handleMessage(const Message& cmd)
|
|
{
|
|
qDebug() << "NFMDemod::handleMessage";
|
|
|
|
if (DownChannelizer::MsgChannelizerNotification::match(cmd))
|
|
{
|
|
DownChannelizer::MsgChannelizerNotification& notif = (DownChannelizer::MsgChannelizerNotification&) cmd;
|
|
|
|
m_config.m_inputSampleRate = notif.getSampleRate();
|
|
m_config.m_inputFrequencyOffset = notif.getFrequencyOffset();
|
|
|
|
apply();
|
|
|
|
qDebug() << "NFMDemod::handleMessage: MsgChannelizerNotification: m_inputSampleRate: " << m_config.m_inputSampleRate
|
|
<< " m_inputFrequencyOffset: " << m_config.m_inputFrequencyOffset;
|
|
|
|
return true;
|
|
}
|
|
else if (MsgConfigureNFMDemod::match(cmd))
|
|
{
|
|
MsgConfigureNFMDemod& cfg = (MsgConfigureNFMDemod&) cmd;
|
|
|
|
m_config.m_rfBandwidth = cfg.getRFBandwidth();
|
|
m_config.m_afBandwidth = cfg.getAFBandwidth();
|
|
m_config.m_fmDeviation = cfg.getFMDeviation();
|
|
m_config.m_volume = cfg.getVolume();
|
|
m_config.m_squelchGate = cfg.getSquelchGate();
|
|
m_config.m_deltaSquelch = cfg.getDeltaSquelch();
|
|
m_config.m_squelch = cfg.getSquelch();
|
|
m_config.m_ctcssOn = cfg.getCtcssOn();
|
|
m_config.m_audioMute = cfg.getAudioMute();
|
|
|
|
apply();
|
|
|
|
qDebug() << "NFMDemod::handleMessage: MsgConfigureNFMDemod: m_rfBandwidth: " << m_config.m_rfBandwidth
|
|
<< " m_afBandwidth: " << m_config.m_afBandwidth
|
|
<< " m_fmDeviation: " << m_config.m_fmDeviation
|
|
<< " m_volume: " << m_config.m_volume
|
|
<< " m_squelchGate: " << m_config.m_squelchGate
|
|
<< " m_deltaSquelch: " << m_config.m_deltaSquelch
|
|
<< " m_squelch: " << m_squelchLevel
|
|
<< " m_ctcssOn: " << m_config.m_ctcssOn
|
|
<< " m_audioMute: " << m_config.m_audioMute;
|
|
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void NFMDemod::apply()
|
|
{
|
|
if ((m_config.m_inputFrequencyOffset != m_running.m_inputFrequencyOffset) ||
|
|
(m_config.m_inputSampleRate != m_running.m_inputSampleRate))
|
|
{
|
|
m_nco.setFreq(-m_config.m_inputFrequencyOffset, m_config.m_inputSampleRate);
|
|
}
|
|
|
|
if ((m_config.m_inputSampleRate != m_running.m_inputSampleRate) ||
|
|
(m_config.m_rfBandwidth != m_running.m_rfBandwidth))
|
|
{
|
|
m_settingsMutex.lock();
|
|
m_interpolator.create(16, m_config.m_inputSampleRate, m_config.m_rfBandwidth / 2.2);
|
|
m_interpolatorDistanceRemain = 0;
|
|
m_interpolatorDistance = (Real) m_config.m_inputSampleRate / (Real) m_config.m_audioSampleRate;
|
|
m_phaseDiscri.setFMScaling((2.0f*m_config.m_rfBandwidth) / (float) m_config.m_fmDeviation);
|
|
m_settingsMutex.unlock();
|
|
}
|
|
|
|
if (m_config.m_fmDeviation != m_running.m_fmDeviation)
|
|
{
|
|
m_phaseDiscri.setFMScaling((2.0f*m_config.m_rfBandwidth) / (float) m_config.m_fmDeviation);
|
|
}
|
|
|
|
if ((m_config.m_afBandwidth != m_running.m_afBandwidth) ||
|
|
(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
|
|
{
|
|
m_settingsMutex.lock();
|
|
m_lowpass.create(301, m_config.m_audioSampleRate, 250.0);
|
|
m_bandpass.create(301, m_config.m_audioSampleRate, 300.0, m_config.m_afBandwidth);
|
|
m_settingsMutex.unlock();
|
|
}
|
|
|
|
if (m_config.m_squelchGate != m_running.m_squelchGate)
|
|
{
|
|
m_squelchGate = 480 * m_config.m_squelchGate; // gate is given in 10s of ms at 48000 Hz audio sample rate
|
|
m_squelchCount = 0; // reset squelch open counter
|
|
}
|
|
|
|
if ((m_config.m_squelch != m_running.m_squelch) ||
|
|
(m_config.m_deltaSquelch != m_running.m_deltaSquelch))
|
|
{
|
|
if (m_config.m_deltaSquelch) { // input is a value in negative millis
|
|
m_squelchLevel = - m_config.m_squelch / 1000.0;
|
|
} else { // input is a value in centi-Bels
|
|
m_squelchLevel = std::pow(10.0, m_config.m_squelch / 100.0);
|
|
}
|
|
//m_squelchLevel *= m_squelchLevel;
|
|
//m_afSquelch.setThreshold(m_squelchLevel);
|
|
}
|
|
|
|
m_running.m_inputSampleRate = m_config.m_inputSampleRate;
|
|
m_running.m_inputFrequencyOffset = m_config.m_inputFrequencyOffset;
|
|
m_running.m_rfBandwidth = m_config.m_rfBandwidth;
|
|
m_running.m_afBandwidth = m_config.m_afBandwidth;
|
|
m_running.m_fmDeviation = m_config.m_fmDeviation;
|
|
m_running.m_squelchGate = m_config.m_squelchGate;
|
|
m_running.m_deltaSquelch = m_config.m_deltaSquelch;
|
|
m_running.m_squelch = m_config.m_squelch;
|
|
m_running.m_volume = m_config.m_volume;
|
|
m_running.m_audioSampleRate = m_config.m_audioSampleRate;
|
|
m_running.m_ctcssOn = m_config.m_ctcssOn;
|
|
m_running.m_audioMute = m_config.m_audioMute;
|
|
}
|