sdrangel/plugins/channelrx/demodvormc/vordemodmcsink.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// Copyright (C) 2020 Jon Beniston, M7RCE //
// //
// 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 //
// (at your option) any later version. //
// //
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef INCLUDE_VORDEMODSINK_H
#define INCLUDE_VORDEMODSINK_H
#include "dsp/channelsamplesink.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/agc.h"
#include "dsp/firfilter.h"
#include "dsp/goertzel.h"
#include "audio/audiofifo.h"
#include "util/movingaverage.h"
#include "util/doublebufferfifo.h"
#include "util/messagequeue.h"
#include "vordemodmcsettings.h"
#include <vector>
// Highest frequency is the FM subcarrier at up to ~11kHz
// However, old VORs can have 0.005% frequency offset, which is 6kHz
#define VORDEMOD_CHANNEL_BANDWIDTH 18000
// Sample rate needs to be at least twice the above
// Also need to consider impact frequency resolution of Goertzel filters
// May as well make it a common audio rate, to possibly avoid decimation
#define VORDEMOD_CHANNEL_SAMPLE_RATE 48000
class VORDemodMCSink : public ChannelSampleSink {
public:
VORDemodMCSink(const VORDemodMCSettings& settings, int subChannel,
MessageQueue *messageQueueToGUI);
~VORDemodMCSink();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void applySettings(const VORDemodMCSettings& settings, bool force = false);
void setMessageQueueToGUI(MessageQueue *messageQueue) { m_messageQueueToGUI = messageQueue; }
void applyAudioSampleRate(int sampleRate);
int getAudioSampleRate() const { return m_audioSampleRate; }
double getMagSq() const { return m_magsq; }
bool getSquelchOpen() const { return m_squelchOpen; }
AudioFifo *getAudioFifo() { return &m_audioFifo; }
void getMagSqLevels(double& avg, double& peak, int& nbSamples)
{
if (m_magsqCount > 0)
{
m_magsq = m_magsqSum / m_magsqCount;
m_magSqLevelStore.m_magsq = m_magsq;
m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
}
avg = m_magSqLevelStore.m_magsq;
peak = m_magSqLevelStore.m_magsqPeak;
nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
m_magsqSum = 0.0f;
m_magsqPeak = 0.0f;
m_magsqCount = 0;
}
int m_subChannelId; // The id for the VOR this demod sink was created for
int m_vorFrequencyHz; // The VORs frequency
int m_frequencyOffset; // Different between sample source center frequeny and VOR center frequency
int m_channelFrequencyOffset;
bool m_outOfBand;
private:
struct MagSqLevelsStore
{
MagSqLevelsStore() :
m_magsq(1e-12),
m_magsqPeak(1e-12)
{}
double m_magsq;
double m_magsqPeak;
};
VORDemodMCSettings m_settings;
int m_channelSampleRate;
int m_audioSampleRate;
NCO m_nco;
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
Real m_squelchLevel;
uint32_t m_squelchCount;
bool m_squelchOpen;
DoubleBufferFIFO<Real> m_squelchDelayLine;
double m_magsq;
double m_magsqSum;
double m_magsqPeak;
int m_magsqCount;
MagSqLevelsStore m_magSqLevelStore;
MessageQueue *m_messageQueueToGUI;
MovingAverageUtil<Real, double, 16> m_movingAverage;
SimpleAGC<4800> m_volumeAGC;
Bandpass<Real> m_bandpass;
Interpolator m_audioInterpolator;
Real m_audioInterpolatorDistance;
Real m_audioInterpolatorDistanceRemain;
AudioVector m_audioBuffer;
AudioFifo m_audioFifo;
uint32_t m_audioBufferFill;
NCO m_ncoIdent;
NCO m_ncoRef;
Lowpass<Complex> m_lowpassRef;
Lowpass<Complex> m_lowpassIdent;
Complex m_refPrev;
MovingAverageUtilVar<Real, double> m_movingAverageIdent;
static const int m_identBins = 10;
Real m_identMins[m_identBins];
Real m_identMin;
Real m_identMaxs[m_identBins];
Real m_identNoise;
int m_binSampleCnt;
int m_binCnt;
int m_samplesPerDot7wpm;
int m_samplesPerDot10wpm;
int m_prevBit;
int m_bitTime;
QString m_ident;
Goertzel m_varGoertzel;
Goertzel m_refGoertzel;
void processOneSample(Complex &ci);
void processOneAudioSample(Complex &ci);
MessageQueue *getMessageQueueToGUI() { return m_messageQueueToGUI; }
};
#endif // INCLUDE_VORDEMODSINK_H