kopia lustrzana https://github.com/f4exb/sdrangel
417 wiersze
13 KiB
C++
417 wiersze
13 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
|
|
// //
|
|
// 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/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <QTime>
|
|
#include <QTimer>
|
|
#include <QDebug>
|
|
|
|
#include "dsp/dspengine.h"
|
|
#include "dsp/dspcommands.h"
|
|
#include "dsp/fftfilt.h"
|
|
#include "dsp/spectrumvis.h"
|
|
#include "util/db.h"
|
|
#include "util/stepfunctions.h"
|
|
#include "util/messagequeue.h"
|
|
|
|
#include "freqtrackerreport.h"
|
|
#include "freqtrackersink.h"
|
|
|
|
FreqTrackerSink::FreqTrackerSink() :
|
|
m_channelSampleRate(48000),
|
|
m_inputFrequencyOffset(0),
|
|
m_sinkSampleRate(48000),
|
|
m_spectrumSink(nullptr),
|
|
m_sampleBufferCount(0),
|
|
m_undersampleCount(0),
|
|
m_squelchOpen(false),
|
|
m_squelchGate(0),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_timerConnected(false),
|
|
m_tickCount(0),
|
|
m_lastCorrAbs(0),
|
|
m_avgDeltaFreq(0.0),
|
|
m_messageQueueToInput(nullptr)
|
|
{
|
|
#ifdef USE_INTERNAL_TIMER
|
|
#warning "Uses internal timer"
|
|
m_timer = new QTimer();
|
|
m_timer->start(50);
|
|
#else
|
|
m_timer = &DSPEngine::instance()->getMasterTimer();
|
|
#endif
|
|
m_magsq = 0.0;
|
|
m_sampleBufferSize = m_sinkSampleRate / 20; // 50 ms
|
|
m_sampleBuffer.resize(m_sampleBufferSize);
|
|
m_sum = Complex{0.0, 0.0};
|
|
|
|
m_rrcFilter = new fftfilt(m_settings.m_rfBandwidth / m_sinkSampleRate, 2*1024);
|
|
m_pll.computeCoefficients(0.002f, 0.5f, 10.0f); // bandwidth, damping factor, loop gain
|
|
applyChannelSettings(m_channelSampleRate, m_inputFrequencyOffset, true);
|
|
}
|
|
|
|
FreqTrackerSink::~FreqTrackerSink()
|
|
{
|
|
disconnectTimer();
|
|
#ifdef USE_INTERNAL_TIMER
|
|
m_timer->stop();
|
|
delete m_timer;
|
|
#endif
|
|
delete m_rrcFilter;
|
|
}
|
|
|
|
void FreqTrackerSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
|
|
{
|
|
Complex ci;
|
|
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
if (m_interpolatorDistance < 1.0f) // interpolate
|
|
{
|
|
processOneSample(ci);
|
|
|
|
while (m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci)) {
|
|
processOneSample(ci);
|
|
}
|
|
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
else // decimate
|
|
{
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(ci);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void FreqTrackerSink::processOneSample(Complex &ci)
|
|
{
|
|
fftfilt::cmplx *sideband;
|
|
int n_out;
|
|
int decim = 1<<m_settings.m_spanLog2;
|
|
m_sum += ci;
|
|
|
|
if (m_undersampleCount++ == decim)
|
|
{
|
|
Real avgr = m_sum.real() / decim;
|
|
Real avgi = m_sum.imag() / decim;
|
|
m_sampleBuffer[m_sampleBufferCount++] = Sample(avgr, avgi);
|
|
m_sum.real(0.0);
|
|
m_sum.imag(0.0);
|
|
m_undersampleCount = 0;
|
|
}
|
|
|
|
if (m_settings.m_rrc)
|
|
{
|
|
n_out = m_rrcFilter->runFilt(ci, &sideband);
|
|
}
|
|
else
|
|
{
|
|
n_out = 1;
|
|
sideband = &ci;
|
|
}
|
|
|
|
for (int i = 0; i < n_out; i++)
|
|
{
|
|
Real re = sideband[i].real() / SDR_RX_SCALEF;
|
|
Real im = sideband[i].imag() / SDR_RX_SCALEF;
|
|
Real magsq = re*re + im*im;
|
|
m_movingAverage(magsq);
|
|
m_magsq = m_movingAverage.asDouble();
|
|
m_magsqSum += magsq;
|
|
|
|
if (magsq > m_magsqPeak)
|
|
{
|
|
m_magsqPeak = magsq;
|
|
}
|
|
|
|
m_magsqCount++;
|
|
|
|
if (m_magsq < m_squelchLevel)
|
|
{
|
|
if (m_squelchGate > 0)
|
|
{
|
|
if (m_squelchCount > 0) {
|
|
m_squelchCount--;
|
|
}
|
|
|
|
m_squelchOpen = m_squelchCount >= m_squelchGate;
|
|
}
|
|
else
|
|
{
|
|
m_squelchOpen = false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (m_squelchGate > 0)
|
|
{
|
|
if (m_squelchCount < 2*m_squelchGate) {
|
|
m_squelchCount++;
|
|
}
|
|
|
|
m_squelchOpen = m_squelchCount >= m_squelchGate;
|
|
}
|
|
else
|
|
{
|
|
m_squelchOpen = true;
|
|
}
|
|
}
|
|
|
|
if (m_squelchOpen)
|
|
{
|
|
if (m_settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
|
|
m_fll.feed(re, im);
|
|
} else if (m_settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
|
|
m_pll.feed(re, im);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
if (m_spectrumSink && (m_sampleBufferCount == m_sampleBufferSize))
|
|
{
|
|
m_spectrumSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), false);
|
|
m_sampleBufferCount = 0;
|
|
}
|
|
|
|
}
|
|
|
|
Real FreqTrackerSink::getFrequency() const
|
|
{
|
|
if (m_settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
|
|
return (m_pll.getFreq() * m_sinkSampleRate) / (2.0 * M_PI);
|
|
} else if (m_settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
|
|
return (m_fll.getFreq() * m_sinkSampleRate) / (2.0 * M_PI);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void FreqTrackerSink::applyChannelSettings(int sinkSampleRate, int channelSampleRate, int inputFrequencyOffset, bool force)
|
|
{
|
|
if (!m_settings.m_tracking)
|
|
{
|
|
qDebug() << "FreqTracker::applyChannelSettings:"
|
|
<< " sinkSampleRate: " << sinkSampleRate
|
|
<< " channelSampleRate: " << channelSampleRate
|
|
<< " inputFrequencyOffset: " << inputFrequencyOffset;
|
|
}
|
|
|
|
bool useInterpolator = false;
|
|
|
|
if ((m_inputFrequencyOffset != inputFrequencyOffset) ||
|
|
(m_channelSampleRate != channelSampleRate) || force)
|
|
{
|
|
m_nco.setFreq(-inputFrequencyOffset, channelSampleRate);
|
|
}
|
|
|
|
if ((m_channelSampleRate != channelSampleRate)
|
|
|| (m_sinkSampleRate != sinkSampleRate) || force)
|
|
{
|
|
m_pll.setSampleRate(sinkSampleRate);
|
|
m_fll.setSampleRate(sinkSampleRate);
|
|
useInterpolator = true;
|
|
}
|
|
|
|
m_sinkSampleRate = sinkSampleRate;
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_inputFrequencyOffset = inputFrequencyOffset;
|
|
|
|
if (useInterpolator) {
|
|
setInterpolator();
|
|
}
|
|
|
|
m_sampleBufferSize = (m_sinkSampleRate/(1<<m_settings.m_spanLog2)) / 20; // 50 ms
|
|
m_sampleBuffer.resize(m_sampleBufferSize);
|
|
m_sampleBufferCount = 0;
|
|
m_undersampleCount = 0;
|
|
}
|
|
|
|
void FreqTrackerSink::applySettings(const FreqTrackerSettings& settings, bool force)
|
|
{
|
|
if (!settings.m_tracking)
|
|
{
|
|
qDebug() << "FreqTrackerSink::applySettings:"
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
|
|
<< " m_rfBandwidth: " << settings.m_rfBandwidth
|
|
<< " m_log2Decim: " << settings.m_log2Decim
|
|
<< " m_squelch: " << settings.m_squelch
|
|
<< " m_rgbColor: " << settings.m_rgbColor
|
|
<< " m_title: " << settings.m_title
|
|
<< " m_alphaEMA: " << settings.m_alphaEMA
|
|
<< " m_tracking: " << settings.m_tracking
|
|
<< " m_trackerType: " << settings.m_trackerType
|
|
<< " m_pllPskOrder: " << settings.m_pllPskOrder
|
|
<< " m_rrc: " << settings.m_rrc
|
|
<< " m_rrcRolloff: " << settings.m_rrcRolloff
|
|
<< " m_streamIndex: " << settings.m_streamIndex
|
|
<< " m_useReverseAPI: " << settings.m_useReverseAPI
|
|
<< " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
|
|
<< " m_reverseAPIPort: " << settings.m_reverseAPIPort
|
|
<< " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
|
|
<< " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
|
|
<< " force: " << force;
|
|
}
|
|
|
|
|
|
if ((m_settings.m_squelch != settings.m_squelch) || force) {
|
|
m_squelchLevel = CalcDb::powerFromdB(settings.m_squelch);
|
|
}
|
|
|
|
if ((m_settings.m_tracking != settings.m_tracking) || force)
|
|
{
|
|
m_avgDeltaFreq = 0.0;
|
|
m_lastCorrAbs = 0;
|
|
|
|
if (settings.m_tracking)
|
|
{
|
|
m_pll.reset();
|
|
m_fll.reset();
|
|
}
|
|
}
|
|
|
|
if ((m_settings.m_trackerType != settings.m_trackerType) || force)
|
|
{
|
|
m_lastCorrAbs = 0;
|
|
m_avgDeltaFreq = 0.0;
|
|
|
|
if (settings.m_trackerType == FreqTrackerSettings::TrackerFLL) {
|
|
m_fll.reset();
|
|
} else if (settings.m_trackerType == FreqTrackerSettings::TrackerPLL) {
|
|
m_pll.reset();
|
|
}
|
|
|
|
if (settings.m_trackerType == FreqTrackerSettings::TrackerNone) {
|
|
disconnectTimer();
|
|
} else {
|
|
connectTimer();
|
|
}
|
|
}
|
|
|
|
if ((m_settings.m_pllPskOrder != settings.m_pllPskOrder) || force)
|
|
{
|
|
if (settings.m_pllPskOrder < 32) {
|
|
m_pll.setPskOrder(settings.m_pllPskOrder);
|
|
}
|
|
}
|
|
|
|
bool useInterpolator = false;
|
|
|
|
if ((m_settings.m_rrcRolloff != settings.m_rrcRolloff)
|
|
|| (m_settings.m_rfBandwidth != settings.m_rfBandwidth)
|
|
|| (m_settings.m_squelchGate != settings.m_squelchGate) || force) {
|
|
useInterpolator = true;
|
|
}
|
|
|
|
if ((settings.m_spanLog2 != m_settings.m_spanLog2) || force)
|
|
{
|
|
m_sampleBufferSize = (m_sinkSampleRate/(1<<settings.m_spanLog2)) / 20; // 50 ms
|
|
m_sampleBuffer.resize(m_sampleBufferSize);
|
|
m_sampleBufferCount = 0;
|
|
m_undersampleCount = 0;
|
|
}
|
|
|
|
m_settings = settings;
|
|
|
|
if (useInterpolator) {
|
|
setInterpolator();
|
|
}
|
|
}
|
|
|
|
void FreqTrackerSink::setInterpolator()
|
|
{
|
|
qDebug("FreqTrackerSink::setInterpolator: m_sinkSampleRate: %u m_channelSampleRate: %d",
|
|
m_sinkSampleRate, m_channelSampleRate);
|
|
|
|
m_interpolator.create(16, m_channelSampleRate, m_settings.m_rfBandwidth / 2.2f);
|
|
m_interpolatorDistanceRemain = 0;
|
|
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) m_sinkSampleRate;
|
|
m_rrcFilter->create_rrc_filter(m_settings.m_rfBandwidth / m_sinkSampleRate, m_settings.m_rrcRolloff / 100.0);
|
|
m_squelchGate = (m_sinkSampleRate / 100) * m_settings.m_squelchGate; // gate is given in 10s of ms at channel sample rate
|
|
}
|
|
|
|
void FreqTrackerSink::connectTimer()
|
|
{
|
|
if (!m_timerConnected)
|
|
{
|
|
m_tickCount = 0;
|
|
connect(m_timer, SIGNAL(timeout()), this, SLOT(tick()));
|
|
m_timerConnected = true;
|
|
}
|
|
}
|
|
|
|
void FreqTrackerSink::disconnectTimer()
|
|
{
|
|
if (m_timerConnected)
|
|
{
|
|
disconnect(m_timer, SIGNAL(timeout()), this, SLOT(tick()));
|
|
m_timerConnected = false;
|
|
}
|
|
}
|
|
|
|
void FreqTrackerSink::tick()
|
|
{
|
|
if (getSquelchOpen()) {
|
|
m_avgDeltaFreq = m_settings.m_alphaEMA*getFrequency() + (1.0 - m_settings.m_alphaEMA)*m_avgDeltaFreq;
|
|
}
|
|
|
|
if (m_tickCount < 9)
|
|
{
|
|
m_tickCount++;
|
|
}
|
|
else
|
|
{
|
|
if ((m_settings.m_tracking) && getSquelchOpen())
|
|
{
|
|
uint32_t decayDivider = 200.0 * m_settings.m_alphaEMA;
|
|
int decayAmount = m_sinkSampleRate < decayDivider ? 1 : m_sinkSampleRate / decayDivider;
|
|
int trim = m_sinkSampleRate / 1000;
|
|
|
|
if (m_lastCorrAbs < decayAmount)
|
|
{
|
|
m_lastCorrAbs = m_avgDeltaFreq < 0 ? -m_avgDeltaFreq : m_avgDeltaFreq;
|
|
|
|
if (m_lastCorrAbs > trim)
|
|
{
|
|
FreqTrackerSettings settings = m_settings;
|
|
settings.m_inputFrequencyOffset += m_avgDeltaFreq;
|
|
if (getMessageQueueToInput())
|
|
{
|
|
FreqTrackerReport::MsgSinkFrequencyOffsetNotification *msg
|
|
= FreqTrackerReport::MsgSinkFrequencyOffsetNotification::create(settings.m_inputFrequencyOffset);
|
|
getMessageQueueToInput()->push(msg);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_lastCorrAbs -= decayAmount;
|
|
}
|
|
}
|
|
|
|
m_tickCount = 0;
|
|
}
|
|
}
|