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415 lines
13 KiB
C++
415 lines
13 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019-2020 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QTime>
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#include <QTimer>
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#include <QDebug>
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#include "dsp/dspengine.h"
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#include "dsp/fftfilt.h"
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#include "dsp/spectrumvis.h"
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#include "util/db.h"
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#include "util/messagequeue.h"
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#include "freqtrackerreport.h"
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#include "freqtrackersink.h"
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FreqTrackerSink::FreqTrackerSink() :
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m_channelSampleRate(48000),
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m_inputFrequencyOffset(0),
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m_sinkSampleRate(48000),
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m_spectrumSink(nullptr),
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m_sampleBufferCount(0),
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m_undersampleCount(0),
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m_squelchOpen(false),
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m_squelchGate(0),
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m_magsqSum(0.0f),
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m_magsqPeak(0.0f),
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m_magsqCount(0),
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m_timerConnected(false),
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m_tickCount(0),
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m_lastCorrAbs(0),
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m_avgDeltaFreq(0.0),
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m_messageQueueToInput(nullptr)
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{
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#ifdef USE_INTERNAL_TIMER
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#warning "Uses internal timer"
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m_timer = new QTimer();
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m_timer->start(50);
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#else
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m_timer = &DSPEngine::instance()->getMasterTimer();
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#endif
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m_magsq = 0.0;
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m_sampleBufferSize = m_sinkSampleRate / 20; // 50 ms
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m_sampleBuffer.resize(m_sampleBufferSize);
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m_sum = Complex{0.0, 0.0};
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m_rrcFilter = new fftfilt(m_settings.m_rfBandwidth / m_sinkSampleRate, 2*1024);
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m_pll.computeCoefficients(0.002f, 0.5f, 10.0f); // bandwidth, damping factor, loop gain
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applyChannelSettings(m_channelSampleRate, m_inputFrequencyOffset, true);
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}
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FreqTrackerSink::~FreqTrackerSink()
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{
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disconnectTimer();
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#ifdef USE_INTERNAL_TIMER
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m_timer->stop();
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delete m_timer;
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#endif
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delete m_rrcFilter;
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}
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void FreqTrackerSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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Complex ci;
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for (SampleVector::const_iterator it = begin; it != end; ++it)
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{
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_interpolatorDistance < 1.0f) // interpolate
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{
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processOneSample(ci);
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while (m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci)) {
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processOneSample(ci);
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}
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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else // decimate
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{
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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}
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}
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void FreqTrackerSink::processOneSample(Complex &ci)
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{
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fftfilt::cmplx *sideband;
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int n_out;
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int decim = 1<<m_settings.m_spanLog2;
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m_sum += ci;
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if (m_undersampleCount++ == decim)
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{
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Real avgr = m_sum.real() / decim;
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Real avgi = m_sum.imag() / decim;
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m_sampleBuffer[m_sampleBufferCount++] = Sample(avgr, avgi);
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m_sum.real(0.0);
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m_sum.imag(0.0);
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m_undersampleCount = 0;
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}
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if (m_settings.m_rrc)
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{
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n_out = m_rrcFilter->runFilt(ci, &sideband);
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}
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else
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{
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n_out = 1;
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sideband = &ci;
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}
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for (int i = 0; i < n_out; i++)
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{
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Real re = sideband[i].real() / SDR_RX_SCALEF;
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Real im = sideband[i].imag() / SDR_RX_SCALEF;
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Real magsq = re*re + im*im;
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m_movingAverage(magsq);
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m_magsq = m_movingAverage.asDouble();
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m_magsqSum += magsq;
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if (magsq > m_magsqPeak)
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{
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m_magsqPeak = magsq;
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}
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m_magsqCount++;
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if (m_magsq < m_squelchLevel)
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{
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if (m_squelchGate > 0)
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{
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if (m_squelchCount > 0) {
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m_squelchCount--;
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}
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m_squelchOpen = m_squelchCount >= m_squelchGate;
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}
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else
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{
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m_squelchOpen = false;
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}
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}
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else
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{
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if (m_squelchGate > 0)
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{
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if (m_squelchCount < 2*m_squelchGate) {
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m_squelchCount++;
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}
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m_squelchOpen = m_squelchCount >= m_squelchGate;
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}
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else
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{
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m_squelchOpen = true;
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}
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}
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if (m_squelchOpen)
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{
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if (m_settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
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m_fll.feed(re, im);
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} else if (m_settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
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m_pll.feed(re, im);
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}
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}
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}
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if (m_spectrumSink && (m_sampleBufferCount == m_sampleBufferSize))
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{
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m_spectrumSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), false);
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m_sampleBufferCount = 0;
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}
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}
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Real FreqTrackerSink::getFrequency() const
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{
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if (m_settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
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return (m_pll.getFreq() * m_sinkSampleRate) / (2.0 * M_PI);
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} else if (m_settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
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return (m_fll.getFreq() * m_sinkSampleRate) / (2.0 * M_PI);
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} else {
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return 0;
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}
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}
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void FreqTrackerSink::applyChannelSettings(int sinkSampleRate, int channelSampleRate, int inputFrequencyOffset, bool force)
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{
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if (!m_settings.m_tracking)
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{
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qDebug() << "FreqTracker::applyChannelSettings:"
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<< " sinkSampleRate: " << sinkSampleRate
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<< " channelSampleRate: " << channelSampleRate
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<< " inputFrequencyOffset: " << inputFrequencyOffset;
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}
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bool useInterpolator = false;
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if ((m_inputFrequencyOffset != inputFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-inputFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != channelSampleRate)
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|| (m_sinkSampleRate != sinkSampleRate) || force)
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{
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m_pll.setSampleRate(sinkSampleRate);
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m_fll.setSampleRate(sinkSampleRate);
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useInterpolator = true;
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}
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m_sinkSampleRate = sinkSampleRate;
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m_channelSampleRate = channelSampleRate;
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m_inputFrequencyOffset = inputFrequencyOffset;
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if (useInterpolator) {
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setInterpolator();
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}
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m_sampleBufferSize = (m_sinkSampleRate/(1<<m_settings.m_spanLog2)) / 20; // 50 ms
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m_sampleBuffer.resize(m_sampleBufferSize);
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m_sampleBufferCount = 0;
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m_undersampleCount = 0;
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}
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void FreqTrackerSink::applySettings(const FreqTrackerSettings& settings, bool force)
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{
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if (!settings.m_tracking)
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{
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qDebug() << "FreqTrackerSink::applySettings:"
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<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
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<< " m_rfBandwidth: " << settings.m_rfBandwidth
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<< " m_log2Decim: " << settings.m_log2Decim
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<< " m_squelch: " << settings.m_squelch
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<< " m_rgbColor: " << settings.m_rgbColor
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<< " m_title: " << settings.m_title
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<< " m_alphaEMA: " << settings.m_alphaEMA
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<< " m_tracking: " << settings.m_tracking
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<< " m_trackerType: " << settings.m_trackerType
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<< " m_pllPskOrder: " << settings.m_pllPskOrder
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<< " m_rrc: " << settings.m_rrc
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<< " m_rrcRolloff: " << settings.m_rrcRolloff
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<< " m_streamIndex: " << settings.m_streamIndex
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<< " m_useReverseAPI: " << settings.m_useReverseAPI
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<< " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
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<< " m_reverseAPIPort: " << settings.m_reverseAPIPort
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<< " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
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<< " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
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<< " force: " << force;
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}
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if ((m_settings.m_squelch != settings.m_squelch) || force) {
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m_squelchLevel = CalcDb::powerFromdB(settings.m_squelch);
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}
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if ((m_settings.m_tracking != settings.m_tracking) || force)
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{
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m_avgDeltaFreq = 0.0;
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m_lastCorrAbs = 0;
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if (settings.m_tracking)
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{
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m_pll.reset();
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m_fll.reset();
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}
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}
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if ((m_settings.m_trackerType != settings.m_trackerType) || force)
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{
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m_lastCorrAbs = 0;
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m_avgDeltaFreq = 0.0;
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if (settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
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m_fll.reset();
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} else if (settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
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m_pll.reset();
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}
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if (settings.m_trackerType == FreqTrackerSettings::TrackerNone) {
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disconnectTimer();
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} else {
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connectTimer();
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}
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}
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if ((m_settings.m_pllPskOrder != settings.m_pllPskOrder) || force)
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{
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if (settings.m_pllPskOrder < 32) {
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m_pll.setPskOrder(settings.m_pllPskOrder);
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}
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}
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bool useInterpolator = false;
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if ((m_settings.m_rrcRolloff != settings.m_rrcRolloff)
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|| (m_settings.m_rfBandwidth != settings.m_rfBandwidth)
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|| (m_settings.m_squelchGate != settings.m_squelchGate) || force) {
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useInterpolator = true;
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}
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if ((settings.m_spanLog2 != m_settings.m_spanLog2) || force)
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{
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m_sampleBufferSize = (m_sinkSampleRate/(1<<settings.m_spanLog2)) / 20; // 50 ms
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m_sampleBuffer.resize(m_sampleBufferSize);
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m_sampleBufferCount = 0;
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m_undersampleCount = 0;
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}
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m_settings = settings;
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if (useInterpolator) {
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setInterpolator();
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}
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}
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void FreqTrackerSink::setInterpolator()
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{
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qDebug("FreqTrackerSink::setInterpolator: m_sinkSampleRate: %u m_channelSampleRate: %d",
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m_sinkSampleRate, m_channelSampleRate);
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m_interpolator.create(16, m_channelSampleRate, m_settings.m_rfBandwidth / 2.2f);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) m_sinkSampleRate;
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m_rrcFilter->create_rrc_filter(m_settings.m_rfBandwidth / m_sinkSampleRate, m_settings.m_rrcRolloff / 100.0);
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m_squelchGate = (m_sinkSampleRate / 100) * m_settings.m_squelchGate; // gate is given in 10s of ms at channel sample rate
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}
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void FreqTrackerSink::connectTimer()
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{
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if (!m_timerConnected)
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{
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m_tickCount = 0;
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connect(m_timer, SIGNAL(timeout()), this, SLOT(tick()));
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m_timerConnected = true;
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}
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}
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void FreqTrackerSink::disconnectTimer()
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{
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if (m_timerConnected)
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{
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disconnect(m_timer, SIGNAL(timeout()), this, SLOT(tick()));
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m_timerConnected = false;
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}
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}
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void FreqTrackerSink::tick()
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{
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if (getSquelchOpen()) {
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m_avgDeltaFreq = m_settings.m_alphaEMA*getFrequency() + (1.0 - m_settings.m_alphaEMA)*m_avgDeltaFreq;
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}
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if (m_tickCount < 9)
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{
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m_tickCount++;
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}
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else
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{
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if ((m_settings.m_tracking) && getSquelchOpen())
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{
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int decayDivider = 200.0 * m_settings.m_alphaEMA;
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int decayAmount = m_sinkSampleRate < decayDivider ? 1 : m_sinkSampleRate / decayDivider;
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int trim = m_sinkSampleRate / 1000;
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if (m_lastCorrAbs < decayAmount)
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{
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m_lastCorrAbs = m_avgDeltaFreq < 0 ? -m_avgDeltaFreq : m_avgDeltaFreq;
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if (m_lastCorrAbs > trim)
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{
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FreqTrackerSettings settings = m_settings;
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settings.m_inputFrequencyOffset += m_avgDeltaFreq;
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if (getMessageQueueToInput())
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{
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FreqTrackerReport::MsgSinkFrequencyOffsetNotification *msg
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= FreqTrackerReport::MsgSinkFrequencyOffsetNotification::create(settings.m_inputFrequencyOffset);
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getMessageQueueToInput()->push(msg);
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}
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}
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}
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else
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{
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m_lastCorrAbs -= decayAmount;
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}
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}
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m_tickCount = 0;
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}
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}
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