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https://github.com/f4exb/sdrangel.git
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639 lines
18 KiB
C++
639 lines
18 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 F4EXB //
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// written by Edouard Griffiths //
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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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// //
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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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#ifndef INCLUDE_INTHALFBANDFILTER_H
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#define INCLUDE_INTHALFBANDFILTER_H
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#include <stdint.h>
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#include "dsp/dsptypes.h"
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#include "dsp/hbfiltertraits.h"
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#include "util/export.h"
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template<uint32_t HBFilterOrder>
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class SDRANGEL_API IntHalfbandFilter {
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public:
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IntHalfbandFilter();
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// downsample by 2, return center part of original spectrum
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bool workDecimateCenter(Sample* sample)
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{
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sample->real();
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m_samples[m_ptr][1] = sample->imag();
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switch(m_state)
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{
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case 0:
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we don't have a new sample
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return false;
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default:
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// save result
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doFIR(sample);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we have a new sample
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return true;
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}
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}
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// upsample by 2, return center part of original spectrum
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bool workInterpolateCenter(Sample* sampleIn, Sample *SampleOut)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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// save result
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doFIR(SampleOut);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sampleIn->real();
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m_samples[m_ptr][1] = sampleIn->imag();
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// save result
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doFIR(SampleOut);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we consumed the sample
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return true;
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}
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}
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bool workDecimateCenter(qint32 *x, qint32 *y)
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{
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = *x;
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m_samples[m_ptr][1] = *y;
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switch(m_state)
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{
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case 0:
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we don't have a new sample
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return false;
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default:
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// save result
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doFIR(x, y);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we have a new sample
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return true;
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}
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}
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// downsample by 2, return edges of spectrum rotated into center - unused
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// bool workDecimateFullRotate(Sample* sample)
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// {
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// switch(m_state)
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// {
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// case 0:
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// // insert sample into ring-buffer
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// m_samples[m_ptr][0] = sample->real();
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// m_samples[m_ptr][1] = sample->imag();
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//
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// // advance write-pointer
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// m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
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//
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// // next state
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// m_state = 1;
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//
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// // tell caller we don't have a new sample
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// return false;
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//
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// default:
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// // insert sample into ring-buffer
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// m_samples[m_ptr][0] = -sample->real();
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// m_samples[m_ptr][1] = sample->imag();
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//
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// // save result
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// doFIR(sample);
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//
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// // advance write-pointer
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// m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
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//
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// // next state
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// m_state = 0;
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//
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// // tell caller we have a new sample
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// return true;
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// }
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// }
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// downsample by 2, return lower half of original spectrum
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bool workDecimateLowerHalf(Sample* sample)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = -sample->imag();
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m_samples[m_ptr][1] = sample->real();
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we don't have a new sample
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return false;
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case 1:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = -sample->real();
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m_samples[m_ptr][1] = -sample->imag();
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// save result
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doFIR(sample);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 2;
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// tell caller we have a new sample
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return true;
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case 2:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sample->imag();
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m_samples[m_ptr][1] = -sample->real();
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 3;
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// tell caller we don't have a new sample
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return false;
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default:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sample->real();
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m_samples[m_ptr][1] = sample->imag();
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// save result
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doFIR(sample);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we have a new sample
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return true;
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}
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}
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// upsample by 2, from lower half of original spectrum
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bool workInterpolateLowerHalf(Sample* sampleIn, Sample *sampleOut)
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{
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Sample s;
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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// save result
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doFIR(&s);
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sampleOut->setReal(s.imag());
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sampleOut->setImag(-s.real());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we didn't consume the sample
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return false;
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case 1:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sampleIn->real();
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m_samples[m_ptr][1] = sampleIn->imag();
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.real());
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sampleOut->setImag(-s.imag());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 2;
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// tell caller we consumed the sample
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return true;
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case 2:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.imag());
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sampleOut->setImag(s.real());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 3;
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// tell caller we didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sampleIn->real();
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m_samples[m_ptr][1] = sampleIn->imag();
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// save result
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doFIR(&s);
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sampleOut->setReal(s.real());
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sampleOut->setImag(s.imag());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we consumed the sample
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return true;
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}
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}
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// downsample by 2, return upper half of original spectrum
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bool workDecimateUpperHalf(Sample* sample)
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{
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sample->imag();
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m_samples[m_ptr][1] = -sample->real();
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we don't have a new sample
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return false;
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case 1:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = -sample->real();
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m_samples[m_ptr][1] = -sample->imag();
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// save result
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doFIR(sample);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 2;
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// tell caller we have a new sample
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return true;
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case 2:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = -sample->imag();
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m_samples[m_ptr][1] = sample->real();
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 3;
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// tell caller we don't have a new sample
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return false;
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default:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sample->real();
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m_samples[m_ptr][1] = sample->imag();
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// save result
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doFIR(sample);
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we have a new sample
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return true;
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}
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}
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// upsample by 2, move original spectrum to upper half
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bool workInterpolateUpperHalf(Sample* sampleIn, Sample *sampleOut)
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{
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Sample s;
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switch(m_state)
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{
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case 0:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.imag());
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sampleOut->setImag(s.real());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 1;
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// tell caller we didn't consume the sample
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return false;
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case 1:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sampleIn->real();
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m_samples[m_ptr][1] = sampleIn->imag();
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// save result
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doFIR(&s);
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sampleOut->setReal(-s.real());
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sampleOut->setImag(-s.imag());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 2;
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// tell caller we consumed the sample
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return true;
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case 2:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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// save result
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doFIR(&s);
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sampleOut->setReal(s.imag());
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sampleOut->setImag(-s.real());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 3;
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// tell caller we didn't consume the sample
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return false;
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default:
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// insert sample into ring-buffer
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m_samples[m_ptr][0] = sampleIn->real();
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m_samples[m_ptr][1] = sampleIn->imag();
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// save result
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doFIR(&s);
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sampleOut->setReal(s.real());
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sampleOut->setImag(s.imag());
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// advance write-pointer
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m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
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// next state
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m_state = 0;
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// tell caller we consumed the sample
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return true;
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}
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}
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void myDecimate(const Sample* sample1, Sample* sample2)
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{
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m_samples[m_ptr][0] = sample1->real();
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m_samples[m_ptr][1] = sample1->imag();
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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m_samples[m_ptr][0] = sample2->real();
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m_samples[m_ptr][1] = sample2->imag();
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doFIR(sample2);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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}
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void myDecimate(qint32 x1, qint32 y1, qint32 *x2, qint32 *y2)
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{
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m_samples[m_ptr][0] = x1;
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m_samples[m_ptr][1] = y1;
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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m_samples[m_ptr][0] = *x2;
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m_samples[m_ptr][1] = *y2;
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doFIR(x2, y2);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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}
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void myInterpolate(Sample* sample1, Sample* sample2)
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{
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m_samples[m_ptr][0] = sample1->real();
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m_samples[m_ptr][1] = sample1->imag();
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doFIR(sample1);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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doFIR(sample2);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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}
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void myInterpolate(qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2)
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{
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m_samples[m_ptr][0] = *x1;
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m_samples[m_ptr][1] = *y1;
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doFIR(x1, y1);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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m_samples[m_ptr][0] = 0;
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m_samples[m_ptr][1] = 0;
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doFIR(x2, y2);
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m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
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}
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protected:
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qint32 m_samples[HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1][2]; // Valgrind optim (from qint16)
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qint16 m_ptr;
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int m_state;
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void doFIR(Sample* sample)
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{
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// init read-pointer
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int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
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int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1
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// go through samples in buffer
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qint32 iAcc = 0;
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qint32 qAcc = 0;
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
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{
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// do multiply-accumulate
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//qint32 iTmp = m_samples[a][0] + m_samples[b][0]; // Valgrind optim
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//qint32 qTmp = m_samples[a][1] + m_samples[b][1]; // Valgrind optim
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iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
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qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
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// update read-pointer
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a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
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b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
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}
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a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];
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iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
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sample->setReal(iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
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sample->setImag(qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
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}
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void doFIR(qint32 *x, qint32 *y)
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{
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// Coefficents. This is a sinc function:
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// Half of the half of coefficients are stored because:
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// - half of the coefficients are 0
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// - there is a symmertry around the central 0.5 coefficient (not stored either)
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// There are actually order+1 coefficients
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|
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// init read-pointer
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int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
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int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1
|
|
|
|
// go through samples in buffer
|
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qint32 iAcc = 0;
|
|
qint32 qAcc = 0;
|
|
|
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for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
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{
|
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// do multiply-accumulate
|
|
//qint32 iTmp = m_samples[a][0] + m_samples[b][0]; // Valgrind optim
|
|
//qint32 qTmp = m_samples[a][1] + m_samples[b][1]; // Valgrind optim
|
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iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
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qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
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|
|
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// update read-pointer
|
|
a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
|
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b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
|
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}
|
|
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a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];
|
|
|
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iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
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qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
|
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*x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1); // HB_SHIFT incorrect do not loose the gained bit
|
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*y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
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}
|
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};
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template<uint32_t HBFilterOrder>
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IntHalfbandFilter<HBFilterOrder>::IntHalfbandFilter()
|
|
{
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1; i++)
|
|
{
|
|
m_samples[i][0] = 0;
|
|
m_samples[i][1] = 0;
|
|
}
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|
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m_ptr = 0;
|
|
|
|
m_state = 0;
|
|
}
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#endif // INCLUDE_INTHALFBANDFILTER_H
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