mirror of
https://github.com/f4exb/sdrangel.git
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155 lines
5.4 KiB
C++
155 lines
5.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// Copyright (C) 2023 Jon Beniston, M7RCE //
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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 <QDebug>
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#include "channelpowersink.h"
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ChannelPowerSink::ChannelPowerSink(ChannelPower *channelPower) :
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m_channelPower(channelPower),
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m_channelSampleRate(10000),
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m_channelFrequencyOffset(0),
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m_lowpassFFT(nullptr),
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m_lowpassBufferIdx(0)
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{
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resetMagLevels();
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applySettings(m_settings, QStringList(), true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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ChannelPowerSink::~ChannelPowerSink()
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{
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}
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void ChannelPowerSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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QMutexLocker mutexLocker(&m_mutex);
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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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processOneSample(c);
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}
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}
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void ChannelPowerSink::processOneSample(Complex &ci)
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{
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// Low pass filter to desired channel bandwidth
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fftfilt::cmplx *filtered;
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int nOut = m_lowpassFFT->runFilt(ci, &filtered);
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if (nOut > 0)
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{
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memcpy(m_lowpassBuffer, filtered, nOut * sizeof(Complex));
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m_lowpassBufferIdx = 0;
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}
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Complex c = m_lowpassBuffer[m_lowpassBufferIdx++];
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// Calculate power
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Real re = c.real() / SDR_RX_SCALEF;
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Real im = c.imag() / SDR_RX_SCALEF;
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Real magsq = re*re + im*im;
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// Although computationally more expensive to take the square root here,
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// it possibly reduces problems of accumulating numbers
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// that may differ significantly in magnitude, for long averages
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double mag = sqrt((double)magsq);
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m_magSum += mag;
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if (mag > m_pulseThresholdLinear)
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{
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m_magPulseSum += mag;
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m_magPulseCount++;
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if (m_magPulseCount >= m_averageCnt)
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{
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m_magPulseAvg = m_magPulseSum / m_magPulseCount;
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m_magPulseSum = 0.0;
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m_magPulseCount = 0;
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}
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}
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if (mag > m_magMaxPeak) {
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m_magMaxPeak = mag;
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}
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if (mag < m_magMinPeak) {
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m_magMinPeak = mag;
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}
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m_magCount++;
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if (m_magCount >= m_averageCnt)
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{
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m_magAvg = m_magSum / m_magCount;
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m_magSum = 0.0;
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m_magCount = 0;
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}
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}
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void ChannelPowerSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "ChannelPowerSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != channelSampleRate) || force)
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{
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delete m_lowpassFFT;
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m_lowpassFFT = new fftfilt(0, m_settings.m_rfBandwidth / 2.0f / m_channelSampleRate, m_lowpassLen);
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m_lowpassBufferIdx = 0;
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channelFrequencyOffset;
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m_averageCnt = (int)((m_settings.m_averagePeriodUS * (qint64)m_channelSampleRate / 1e6));
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}
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void ChannelPowerSink::applySettings(const ChannelPowerSettings& settings, const QStringList& settingsKeys, bool force)
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{
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qDebug() << "ChannelPowerSink::applySettings:" << " force: " << force << settings.getDebugString(settingsKeys, force);
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if ((settingsKeys.contains("rfBandwidth") && (settings.m_rfBandwidth != m_settings.m_rfBandwidth)) || force)
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{
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delete m_lowpassFFT;
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m_lowpassFFT = new fftfilt(0, settings.m_rfBandwidth / 2.0f / m_channelSampleRate, m_lowpassLen);
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m_lowpassBufferIdx = 0;
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}
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if (settingsKeys.contains("averagePeriodUS") || force) {
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m_averageCnt = (int)((settings.m_averagePeriodUS * (qint64)m_channelSampleRate / 1e6));
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}
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if (settingsKeys.contains("pulseThreshold") || force) {
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m_pulseThresholdLinear = std::pow(10.0, settings.m_pulseThreshold / 20.0);
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}
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if (force) {
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m_settings = settings;
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} else {
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m_settings.applySettings(settingsKeys, settings);
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}
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}
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