mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-13 20:01:46 -05:00
270 lines
9.4 KiB
C++
270 lines
9.4 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 "chanalyzersink.h"
|
|
|
|
#include <QTime>
|
|
#include <QDebug>
|
|
#include <stdio.h>
|
|
|
|
#include "dsp/basebandsamplesink.h"
|
|
|
|
const unsigned int ChannelAnalyzerSink::m_ssbFftLen = 1024;
|
|
const unsigned int ChannelAnalyzerSink::m_corrFFTLen = 4*m_ssbFftLen;
|
|
|
|
ChannelAnalyzerSink::ChannelAnalyzerSink() :
|
|
m_channelSampleRate(48000),
|
|
m_channelFrequencyOffset(0),
|
|
m_sampleSink(nullptr)
|
|
{
|
|
m_usb = true;
|
|
m_magsq = 0;
|
|
m_interpolatorDistance = 1.0f;
|
|
m_interpolatorDistanceRemain = 0.0f;
|
|
SSBFilter = new fftfilt(m_settings.m_lowCutoff / m_channelSampleRate, m_settings.m_bandwidth / m_channelSampleRate, m_ssbFftLen);
|
|
DSBFilter = new fftfilt(m_settings.m_bandwidth / m_channelSampleRate, 2*m_ssbFftLen);
|
|
RRCFilter = new fftfilt(m_settings.m_bandwidth / m_channelSampleRate, 2*m_ssbFftLen);
|
|
m_corr = new fftcorr(2*m_corrFFTLen); // 8k for 4k effective samples
|
|
m_pll.computeCoefficients(0.002f, 0.5f, 10.0f); // bandwidth, damping factor, loop gain
|
|
|
|
applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
|
|
applySettings(m_settings, true);
|
|
}
|
|
|
|
ChannelAnalyzerSink::~ChannelAnalyzerSink()
|
|
{
|
|
delete SSBFilter;
|
|
delete DSBFilter;
|
|
delete RRCFilter;
|
|
delete m_corr;
|
|
}
|
|
|
|
void ChannelAnalyzerSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
|
|
{
|
|
fftfilt::cmplx *sideband = 0;
|
|
Complex ci;
|
|
|
|
for (SampleVector::const_iterator it = begin; it < end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
c *= m_nco.nextIQ();
|
|
|
|
if (m_settings.m_rationalDownSample)
|
|
{
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(ci, sideband);
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
processOneSample(c, sideband);
|
|
}
|
|
}
|
|
|
|
if (m_sampleSink) {
|
|
m_sampleSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), m_settings.m_ssb); // m_ssb = positive only
|
|
}
|
|
|
|
m_sampleBuffer.clear();
|
|
}
|
|
|
|
void ChannelAnalyzerSink::processOneSample(Complex& c, fftfilt::cmplx *sideband)
|
|
{
|
|
int n_out;
|
|
|
|
if (m_settings.m_ssb)
|
|
{
|
|
n_out = SSBFilter->runSSB(c, &sideband, m_usb);
|
|
}
|
|
else
|
|
{
|
|
if (m_settings.m_rrc) {
|
|
n_out = RRCFilter->runFilt(c, &sideband);
|
|
} else {
|
|
n_out = DSBFilter->runDSB(c, &sideband);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < n_out; i++)
|
|
{
|
|
fftfilt::cmplx si = sideband[i];
|
|
Real re = si.real() / SDR_RX_SCALEF;
|
|
Real im = si.imag() / SDR_RX_SCALEF;
|
|
m_magsq = re*re + im*im;
|
|
m_channelPowerAvg(m_magsq);
|
|
std::complex<float> mix;
|
|
|
|
if (m_settings.m_pll)
|
|
{
|
|
if (m_settings.m_fll)
|
|
{
|
|
m_fll.feed(re, im);
|
|
// Use -fPLL to mix (exchange PLL real and image in the complex multiplication)
|
|
mix = si * std::conj(m_fll.getComplex());
|
|
}
|
|
else
|
|
{
|
|
m_pll.feed(re, im);
|
|
// Use -fPLL to mix (exchange PLL real and image in the complex multiplication)
|
|
mix = si * std::conj(m_pll.getComplex());
|
|
}
|
|
}
|
|
|
|
feedOneSample(m_settings.m_pll ? mix : si, m_settings.m_fll ? m_fll.getComplex() : m_pll.getComplex());
|
|
}
|
|
}
|
|
|
|
void ChannelAnalyzerSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
|
|
{
|
|
qDebug() << "ChannelAnalyzerSink::applyChannelSettings:"
|
|
<< " channelSampleRate: " << channelSampleRate
|
|
<< " channelFrequencyOffset: " << channelFrequencyOffset;
|
|
|
|
if ((m_channelFrequencyOffset != channelFrequencyOffset) ||
|
|
(m_channelSampleRate != channelSampleRate) || force)
|
|
{
|
|
m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
|
|
}
|
|
|
|
if ((m_channelSampleRate != channelSampleRate) || force)
|
|
{
|
|
m_interpolator.create(16, channelSampleRate, channelSampleRate / 2.2f);
|
|
m_interpolatorDistanceRemain = 0;
|
|
m_interpolatorDistance = (Real) channelSampleRate / (Real) m_settings.m_rationalDownSamplerRate;
|
|
|
|
int sinkSampleRate = m_settings.m_rationalDownSample ? m_settings.m_rationalDownSamplerRate : channelSampleRate;
|
|
setFilters(sinkSampleRate, m_settings.m_bandwidth, m_settings.m_lowCutoff);
|
|
m_pll.setSampleRate(sinkSampleRate);
|
|
m_fll.setSampleRate(sinkSampleRate);
|
|
}
|
|
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_channelFrequencyOffset = channelFrequencyOffset;
|
|
}
|
|
|
|
void ChannelAnalyzerSink::setFilters(int sampleRate, float bandwidth, float lowCutoff)
|
|
{
|
|
qDebug("ChannelAnalyzerSink::setFilters: sampleRate: %d bandwidth: %f lowCutoff: %f",
|
|
sampleRate, bandwidth, lowCutoff);
|
|
|
|
if (bandwidth < 0)
|
|
{
|
|
bandwidth = -bandwidth;
|
|
lowCutoff = -lowCutoff;
|
|
m_usb = false;
|
|
}
|
|
else
|
|
{
|
|
m_usb = true;
|
|
}
|
|
|
|
if (bandwidth < 100.0f)
|
|
{
|
|
bandwidth = 100.0f;
|
|
lowCutoff = 0;
|
|
}
|
|
|
|
SSBFilter->create_filter(lowCutoff / sampleRate, bandwidth / sampleRate);
|
|
DSBFilter->create_dsb_filter(bandwidth / sampleRate);
|
|
RRCFilter->create_rrc_filter(bandwidth / sampleRate, m_settings.m_rrcRolloff / 100.0);
|
|
}
|
|
|
|
void ChannelAnalyzerSink::applySettings(const ChannelAnalyzerSettings& settings, bool force)
|
|
{
|
|
qDebug() << "ChannelAnalyzerSink::applySettings:"
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
|
|
<< " m_rationalDownSample: " << settings.m_rationalDownSample
|
|
<< " m_rationalDownSamplerRate: " << settings.m_rationalDownSamplerRate
|
|
<< " m_rcc: " << settings.m_rrc
|
|
<< " m_rrcRolloff: " << settings.m_rrcRolloff / 100.0
|
|
<< " m_bandwidth: " << settings.m_bandwidth
|
|
<< " m_lowCutoff: " << settings.m_lowCutoff
|
|
<< " m_log2Decim: " << settings.m_log2Decim
|
|
<< " m_ssb: " << settings.m_ssb
|
|
<< " m_pll: " << settings.m_pll
|
|
<< " m_fll: " << settings.m_fll
|
|
<< " m_pllPskOrder: " << settings.m_pllPskOrder
|
|
<< " m_inputType: " << (int) settings.m_inputType;
|
|
|
|
if ((settings.m_rationalDownSamplerRate != m_settings.m_rationalDownSamplerRate) || force)
|
|
{
|
|
m_interpolator.create(16, m_channelSampleRate, m_channelSampleRate / 2.2);
|
|
m_interpolatorDistanceRemain = 0.0f;
|
|
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) settings.m_rationalDownSamplerRate;
|
|
}
|
|
|
|
if ((settings.m_rationalDownSample != m_settings.m_rationalDownSample) || force)
|
|
{
|
|
int sinkSampleRate = settings.m_rationalDownSample ? settings.m_rationalDownSamplerRate : m_channelSampleRate;
|
|
|
|
setFilters(sinkSampleRate, settings.m_bandwidth, settings.m_lowCutoff);
|
|
m_pll.setSampleRate(sinkSampleRate);
|
|
m_fll.setSampleRate(sinkSampleRate);
|
|
}
|
|
|
|
if ((settings.m_bandwidth != m_settings.m_bandwidth) ||
|
|
(settings.m_lowCutoff != m_settings.m_lowCutoff)|| force)
|
|
{
|
|
int sinkSampleRate = settings.m_rationalDownSample ? settings.m_rationalDownSamplerRate : m_channelSampleRate;
|
|
setFilters(sinkSampleRate, settings.m_bandwidth, settings.m_lowCutoff);
|
|
}
|
|
|
|
if ((settings.m_rrcRolloff != m_settings.m_rrcRolloff) || force)
|
|
{
|
|
float sinkSampleRate = settings.m_rationalDownSample ? (float) settings.m_rationalDownSamplerRate : (float) m_channelSampleRate;
|
|
RRCFilter->create_rrc_filter(settings.m_bandwidth / sinkSampleRate, settings.m_rrcRolloff / 100.0);
|
|
}
|
|
|
|
if (settings.m_pll != m_settings.m_pll || force)
|
|
{
|
|
if (settings.m_pll)
|
|
{
|
|
m_pll.reset();
|
|
m_fll.reset();
|
|
}
|
|
}
|
|
|
|
if (settings.m_fll != m_settings.m_fll || force)
|
|
{
|
|
if (settings.m_fll) {
|
|
m_fll.reset();
|
|
}
|
|
}
|
|
|
|
if (settings.m_pllPskOrder != m_settings.m_pllPskOrder || force)
|
|
{
|
|
if (settings.m_pllPskOrder < 32) {
|
|
m_pll.setPskOrder(settings.m_pllPskOrder);
|
|
}
|
|
}
|
|
|
|
m_settings = settings;
|
|
}
|
|
|
|
Real ChannelAnalyzerSink::getPllFrequency() const
|
|
{
|
|
if (m_settings.m_fll) {
|
|
return m_fll.getFreq();
|
|
} else if (m_settings.m_pll) {
|
|
return m_pll.getFreq();
|
|
} else {
|
|
return 0.0;
|
|
}
|
|
}
|