mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-11-04 05:30:32 -05:00
133 lines
5.1 KiB
C++
133 lines
5.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2020-2021, 2023 Jon Beniston, M7RCE <jon@beniston.com> //
|
|
// Copyright (C) 2020-2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
|
|
// //
|
|
// 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_RTTYMODSOURCE_H
|
|
#define INCLUDE_RTTYMODSOURCE_H
|
|
|
|
#include <QMutex>
|
|
#include <QDebug>
|
|
#include <QVector>
|
|
|
|
#include "dsp/channelsamplesource.h"
|
|
#include "dsp/nco.h"
|
|
#include "dsp/interpolator.h"
|
|
#include "dsp/firfilter.h"
|
|
#include "dsp/raisedcosine.h"
|
|
#include "util/movingaverage.h"
|
|
#include "util/baudot.h"
|
|
|
|
#include "rttymodsettings.h"
|
|
|
|
class BasebandSampleSink;
|
|
class ChannelAPI;
|
|
|
|
class RttyModSource : public ChannelSampleSource
|
|
{
|
|
public:
|
|
RttyModSource();
|
|
virtual ~RttyModSource();
|
|
|
|
virtual void pull(SampleVector::iterator begin, unsigned int nbSamples);
|
|
virtual void pullOne(Sample& sample);
|
|
virtual void prefetch(unsigned int nbSamples) { (void) nbSamples; }
|
|
|
|
double getMagSq() const { return m_magsq; }
|
|
void getLevels(qreal& rmsLevel, qreal& peakLevel, int& numSamples) const
|
|
{
|
|
rmsLevel = m_rmsLevel;
|
|
peakLevel = m_peakLevelOut;
|
|
numSamples = m_levelNbSamples;
|
|
}
|
|
void setMessageQueueToGUI(MessageQueue* messageQueue) { m_messageQueueToGUI = messageQueue; }
|
|
void setSpectrumSink(BasebandSampleSink *sampleSink) { m_spectrumSink = sampleSink; }
|
|
void applySettings(const RttyModSettings& settings, bool force = false);
|
|
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
|
|
void addTXText(QString data);
|
|
void setChannel(ChannelAPI *channel) { m_channel = channel; }
|
|
int getChannelSampleRate() const { return m_channelSampleRate; }
|
|
|
|
private:
|
|
int m_channelSampleRate;
|
|
int m_channelFrequencyOffset;
|
|
int m_spectrumRate;
|
|
RttyModSettings m_settings;
|
|
ChannelAPI *m_channel;
|
|
|
|
NCO m_carrierNco;
|
|
double m_fmPhase; // Double gives cleaner spectrum than Real
|
|
double m_phaseSensitivity;
|
|
Real m_linearGain;
|
|
Complex m_modSample;
|
|
|
|
int m_bit; // Current bit
|
|
RaisedCosine<Real> m_pulseShape; // Pulse shaping filter
|
|
Lowpass<Complex> m_lowpass; // Low pass filter to limit RF bandwidth
|
|
|
|
BasebandSampleSink* m_spectrumSink; // Spectrum GUI to display baseband waveform
|
|
SampleVector m_specSampleBuffer;
|
|
static const int m_specSampleBufferSize = 256;
|
|
int m_specSampleBufferIndex;
|
|
Interpolator m_interpolator; // Interpolator to downsample to spectrum
|
|
Real m_interpolatorDistance;
|
|
Real m_interpolatorDistanceRemain;
|
|
bool m_interpolatorConsumed;
|
|
|
|
double m_magsq;
|
|
MovingAverageUtil<double, double, 16> m_movingAverage;
|
|
|
|
quint32 m_levelCalcCount;
|
|
qreal m_rmsLevel;
|
|
qreal m_peakLevelOut;
|
|
Real m_peakLevel;
|
|
Real m_levelSum;
|
|
|
|
static const int m_levelNbSamples = 480; // every 10ms assuming 48k Sa/s
|
|
|
|
int m_sampleIdx; // Sample index in to symbol
|
|
int m_samplesPerSymbol; // Number of samples per symbol
|
|
|
|
QString m_textToTransmit; // Transmit buffer (before RTTY encoding)
|
|
|
|
BaudotEncoder m_rttyEncoder;
|
|
|
|
QList<uint8_t> m_bits; // Bits to transmit
|
|
int m_byteIdx; // Index in to m_bits
|
|
int m_bitIdx; // Index in to current byte of m_bits
|
|
int m_bitCount; // Count of number of valid bits in m_bits
|
|
int m_bitCountTotal;
|
|
|
|
QVector<qint16> m_demodBuffer;
|
|
int m_demodBufferFill;
|
|
|
|
MessageQueue* m_messageQueueToGUI;
|
|
|
|
MessageQueue* getMessageQueueToGUI() { return m_messageQueueToGUI; }
|
|
|
|
void encodeText(const QString& data);
|
|
int getBit(); // Get bit from m_bits
|
|
void addBit(int bit); // Add bit to m_bits, with zero stuffing
|
|
void initTX();
|
|
|
|
void calculateLevel(Real& sample);
|
|
void modulateSample();
|
|
void sampleToSpectrum(Complex sample);
|
|
|
|
};
|
|
|
|
#endif // INCLUDE_RTTYMODSOURCE_H
|