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352 lines
12 KiB
C++
352 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016-2019, 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.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 <array>
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#include <QString>
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#include <QDebug>
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#include <algorithm>
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#include "hbfilterchainconverter.h"
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#include "upchannelizer.h"
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UpChannelizer::UpChannelizer(ChannelSampleSource* sampleSource) :
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m_filterChainSetMode(false),
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m_sampleSource(sampleSource),
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m_basebandSampleRate(0),
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m_requestedInputSampleRate(0),
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m_requestedCenterFrequency(0),
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m_channelSampleRate(0),
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m_channelFrequencyOffset(0),
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m_log2Interp(0),
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m_filterChainHash(0)
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{
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}
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UpChannelizer::~UpChannelizer()
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{
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freeFilterChain();
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}
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void UpChannelizer::pullOne(Sample& sample)
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{
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if (m_sampleSource == nullptr)
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{
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m_sampleBuffer.clear();
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return;
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}
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unsigned int log2Interp = m_filterStages.size();
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if (log2Interp == 0) // optimization when no downsampling is done anyway
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{
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m_sampleSource->pullOne(sample);
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}
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else
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{
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FilterStages::iterator stage = m_filterStages.begin();
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std::vector<Sample>::iterator stageSample = m_stageSamples.begin();
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for (; stage != m_filterStages.end(); ++stage, ++stageSample)
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{
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if(stage == m_filterStages.end() - 1)
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{
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if ((*stage)->work(&m_sampleIn, &(*stageSample)))
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{
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m_sampleSource->pullOne(m_sampleIn); // get new input sample
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}
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}
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else
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{
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if (!(*stage)->work(&(*(stageSample+1)), &(*stageSample)))
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{
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break;
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}
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}
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}
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sample = *m_stageSamples.begin();
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}
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}
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void UpChannelizer::pull(SampleVector::iterator begin, unsigned int nbSamples)
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{
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if (m_sampleSource == nullptr)
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{
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m_sampleBuffer.clear();
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return;
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}
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unsigned int log2Interp = m_filterStages.size();
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if (log2Interp == 0) // optimization when no downsampling is done anyway
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{
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m_sampleSource->pull(begin, nbSamples);
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}
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else
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{
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std::for_each(
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begin,
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begin + nbSamples,
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[this](Sample& s) {
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pullOne(s);
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}
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);
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}
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}
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void UpChannelizer::prefetch(unsigned int nbSamples)
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{
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unsigned int log2Interp = m_filterStages.size();
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m_sampleSource->prefetch(nbSamples/(1<<log2Interp)); // 2^n less samples will be produced by the source
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}
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void UpChannelizer::setChannelization(int requestedSampleRate, qint64 requestedCenterFrequency)
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{
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m_requestedInputSampleRate = requestedSampleRate;
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m_requestedCenterFrequency = requestedCenterFrequency;
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applyChannelization();
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}
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void UpChannelizer::setBasebandSampleRate(int basebandSampleRate, bool interp)
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{
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m_basebandSampleRate = basebandSampleRate;
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if (interp) {
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applyInterpolation();
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} else {
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applyChannelization();
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}
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}
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void UpChannelizer::applyChannelization()
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{
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m_filterChainSetMode = false;
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if (m_basebandSampleRate == 0)
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{
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qDebug() << "UpChannelizer::applyConfiguration: aborting (out=0):"
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<< " out:" << m_basebandSampleRate
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<< " req:" << m_requestedInputSampleRate
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<< " in:" << m_channelSampleRate
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<< " fc:" << m_channelFrequencyOffset;
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return;
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}
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freeFilterChain();
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m_channelFrequencyOffset = createFilterChain(
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m_basebandSampleRate / -2, m_basebandSampleRate / 2,
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m_requestedCenterFrequency - m_requestedInputSampleRate / 2, m_requestedCenterFrequency + m_requestedInputSampleRate / 2);
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m_channelSampleRate = m_basebandSampleRate / (1 << m_filterStages.size());
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qDebug() << "UpChannelizer::applyConfiguration: done: "
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<< " out:" << m_basebandSampleRate
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<< " req:" << m_requestedInputSampleRate
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<< " in:" << m_channelSampleRate
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<< " fc:" << m_channelFrequencyOffset;
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}
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void UpChannelizer::setInterpolation(unsigned int log2Interp, unsigned int filterChainHash)
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{
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m_log2Interp = log2Interp;
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m_filterChainHash = filterChainHash;
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applyInterpolation();
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}
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void UpChannelizer::applyInterpolation()
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{
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m_filterChainSetMode = true;
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std::vector<unsigned int> stageIndexes;
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m_channelFrequencyOffset = m_basebandSampleRate * HBFilterChainConverter::convertToIndexes(m_log2Interp, m_filterChainHash, stageIndexes);
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m_requestedCenterFrequency = m_channelFrequencyOffset;
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freeFilterChain();
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m_channelFrequencyOffset = m_basebandSampleRate * setFilterChain(stageIndexes);
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m_channelSampleRate = m_basebandSampleRate / (1 << m_filterStages.size());
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m_requestedInputSampleRate = m_channelSampleRate;
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qDebug() << "UpChannelizer::applyInterpolation:"
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<< " m_log2Interp:" << m_log2Interp
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<< " m_filterChainHash:" << m_filterChainHash
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<< " out:" << m_basebandSampleRate
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<< " in:" << m_channelSampleRate
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<< " fc:" << m_channelFrequencyOffset;
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}
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#ifdef USE_SSE4_1
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UpChannelizer::FilterStage::FilterStage(Mode mode) :
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m_filter(new IntHalfbandFilterEO1<UPCHANNELIZER_HB_FILTER_ORDER>),
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m_workFunction(0)
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{
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switch(mode) {
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case ModeCenter:
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m_workFunction = &IntHalfbandFilterEO1<UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateCenter;
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break;
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case ModeLowerHalf:
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m_workFunction = &IntHalfbandFilterEO1<UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateLowerHalf;
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break;
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case ModeUpperHalf:
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m_workFunction = &IntHalfbandFilterEO1<UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateUpperHalf;
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break;
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}
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}
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#else
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UpChannelizer::FilterStage::FilterStage(Mode mode) :
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m_filter(new IntHalfbandFilterDB<qint32, UPCHANNELIZER_HB_FILTER_ORDER>),
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m_workFunction(0)
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{
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switch(mode) {
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case ModeCenter:
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m_workFunction = &IntHalfbandFilterDB<qint32, UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateCenter;
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break;
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case ModeLowerHalf:
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m_workFunction = &IntHalfbandFilterDB<qint32, UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateLowerHalf;
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break;
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case ModeUpperHalf:
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m_workFunction = &IntHalfbandFilterDB<qint32, UPCHANNELIZER_HB_FILTER_ORDER>::workInterpolateUpperHalf;
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break;
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}
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}
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#endif
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UpChannelizer::FilterStage::~FilterStage()
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{
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delete m_filter;
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}
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Real UpChannelizer::channelMinSpace(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd)
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{
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Real leftSpace = chanStart - sigStart;
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Real rightSpace = sigEnd - chanEnd;
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return std::min(leftSpace, rightSpace);
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}
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Real UpChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd)
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{
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Real sigBw = sigEnd - sigStart;
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Real chanBw = chanEnd - chanStart;
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Real rot = sigBw / 4;
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Sample s;
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std::array<Real, 3> filterMinSpaces; // Array of left, center and right filter min spaces respectively
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filterMinSpaces[0] = channelMinSpace(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd);
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filterMinSpaces[1] = channelMinSpace(sigStart + rot, sigEnd - rot, chanStart, chanEnd);
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filterMinSpaces[2] = channelMinSpace(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd);
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auto maxIt = std::max_element(filterMinSpaces.begin(), filterMinSpaces.end());
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int maxIndex = maxIt - filterMinSpaces.begin();
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Real maxValue = *maxIt;
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qDebug("UpChannelizer::createFilterChain: Signal [%.1f, %.1f] (BW %.1f) Channel [%.1f, %.1f] (BW %.1f) Selected: %d (fit %.1f)",
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sigStart, sigEnd, sigBw, chanStart, chanEnd, chanBw, maxIndex, maxValue);
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if ((sigStart < sigEnd) && (chanStart < chanEnd) && (maxValue >= chanBw/8.0))
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{
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if (maxIndex == 0)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
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m_stageSamples.push_back(s);
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return createFilterChain(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd);
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}
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if (maxIndex == 1)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
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m_stageSamples.push_back(s);
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return createFilterChain(sigStart + rot, sigEnd - rot, chanStart, chanEnd);
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}
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if (maxIndex == 2)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
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m_stageSamples.push_back(s);
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return createFilterChain(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd);
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}
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}
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Real ofs = ((chanEnd - chanStart) / 2.0 + chanStart) - ((sigEnd - sigStart) / 2.0 + sigStart);
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qDebug() << "UpChannelizer::createFilterChain: complete:"
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<< " #stages: " << m_filterStages.size()
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<< " BW: " << sigBw
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<< " ofs: " << ofs;
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return ofs;
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}
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double UpChannelizer::setFilterChain(const std::vector<unsigned int>& stageIndexes)
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{
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// filters are described from lower to upper level but the chain is constructed the other way round
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std::vector<unsigned int>::const_reverse_iterator rit = stageIndexes.rbegin();
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double ofs = 0.0, ofs_stage = 0.25;
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Sample s;
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// Each index is a base 3 number with 0 = low, 1 = center, 2 = high
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// Functions at upper level will convert a number to base 3 to describe the filter chain. Common converting
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// algorithms will go from LSD to MSD. This explains the reverse order.
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for (; rit != stageIndexes.rend(); ++rit)
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{
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if (*rit == 0)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
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m_stageSamples.push_back(s);
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ofs -= ofs_stage;
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qDebug("UpChannelizer::setFilterChain: lower half: ofs: %f", ofs);
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}
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else if (*rit == 1)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
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m_stageSamples.push_back(s);
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qDebug("UpChannelizer::setFilterChain: center: ofs: %f", ofs);
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}
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else if (*rit == 2)
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{
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m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
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m_stageSamples.push_back(s);
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ofs += ofs_stage;
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qDebug("UpChannelizer::setFilterChain: upper half: ofs: %f", ofs);
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}
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ofs_stage /= 2;
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}
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qDebug() << "UpChannelizer::setFilterChain: complete:"
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<< " #stages: " << m_filterStages.size()
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<< " ofs: " << ofs;
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return ofs;
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}
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void UpChannelizer::freeFilterChain()
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{
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for(FilterStages::iterator it = m_filterStages.begin(); it != m_filterStages.end(); ++it)
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delete *it;
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m_filterStages.clear();
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m_stageSamples.clear();
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}
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