mirror of
https://github.com/f4exb/sdrangel.git
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861 lines
25 KiB
C++
861 lines
25 KiB
C++
#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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// upsample by 2, return center part of original spectrum - double buffer variant
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bool workInterpolateCenterDB(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_samplesDB[m_ptrDB][0] = 0;
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m_samplesDB[m_ptrDB][1] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][0] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][1] = 0;
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// save result
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doFIRDB(SampleOut);
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// advance write-pointer
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m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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_samplesDB[m_ptrDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB][1] = sampleIn->imag();
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m_samplesDB[m_ptrDB + m_sizeDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB + m_sizeDB][1] = sampleIn->imag();
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// save result
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doFIRDB(SampleOut);
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// advance write-pointer
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m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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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// upsample by 2, from lower half of original spectrum - double buffer variant
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bool workInterpolateLowerHalfDB(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_samplesDB[m_ptrDB][0] = 0;
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m_samplesDB[m_ptrDB][1] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][0] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][1] = 0;
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// save result
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doFIRDB(&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_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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_samplesDB[m_ptrDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB][1] = sampleIn->imag();
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m_samplesDB[m_ptrDB + m_sizeDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB + m_sizeDB][1] = sampleIn->imag();
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// save result
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doFIRDB(&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_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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_samplesDB[m_ptrDB][0] = 0;
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m_samplesDB[m_ptrDB][1] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][0] = 0;
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m_samplesDB[m_ptrDB + m_sizeDB][1] = 0;
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// save result
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doFIRDB(&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_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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_samplesDB[m_ptrDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB][1] = sampleIn->imag();
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m_samplesDB[m_ptrDB + m_sizeDB][0] = sampleIn->real();
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m_samplesDB[m_ptrDB + m_sizeDB][1] = sampleIn->imag();
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// save result
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doFIRDB(&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_ptrDB = (m_ptrDB + 1) % m_sizeDB;
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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
|
|
m_state = 2;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
m_samples[m_ptr][0] = 0;
|
|
m_samples[m_ptr][1] = 0;
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.imag());
|
|
sampleOut->setImag(-s.real());
|
|
|
|
// advance write-pointer
|
|
m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
|
|
// next state
|
|
m_state = 3;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// advance write-pointer
|
|
m_ptr = (m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
|
|
// next state
|
|
m_state = 0;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// upsample by 2, move original spectrum to upper half - double buffer variant
|
|
bool workInterpolateUpperHalfDB(Sample* sampleIn, Sample *sampleOut)
|
|
{
|
|
Sample s;
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
m_samplesDB[m_ptrDB][0] = 0;
|
|
m_samplesDB[m_ptrDB][1] = 0;
|
|
m_samplesDB[m_ptrDB + m_sizeDB][0] = 0;
|
|
m_samplesDB[m_ptrDB + m_sizeDB][1] = 0;
|
|
|
|
// save result
|
|
doFIRDB(&s);
|
|
sampleOut->setReal(-s.imag());
|
|
sampleOut->setImag(s.real());
|
|
|
|
// advance write-pointer
|
|
m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
|
|
|
|
// next state
|
|
m_state = 1;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
case 1:
|
|
// insert sample into ring-buffer
|
|
m_samplesDB[m_ptrDB][0] = sampleIn->real();
|
|
m_samplesDB[m_ptrDB][1] = sampleIn->imag();
|
|
m_samplesDB[m_ptrDB + m_sizeDB][0] = sampleIn->real();
|
|
m_samplesDB[m_ptrDB + m_sizeDB][1] = sampleIn->imag();
|
|
|
|
// save result
|
|
doFIRDB(&s);
|
|
sampleOut->setReal(-s.real());
|
|
sampleOut->setImag(-s.imag());
|
|
|
|
// advance write-pointer
|
|
m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
|
|
|
|
// next state
|
|
m_state = 2;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
m_samplesDB[m_ptrDB][0] = 0;
|
|
m_samplesDB[m_ptrDB][1] = 0;
|
|
m_samplesDB[m_ptrDB + m_sizeDB][0] = 0;
|
|
m_samplesDB[m_ptrDB + m_sizeDB][1] = 0;
|
|
|
|
// save result
|
|
doFIRDB(&s);
|
|
sampleOut->setReal(s.imag());
|
|
sampleOut->setImag(-s.real());
|
|
|
|
// advance write-pointer
|
|
m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
|
|
|
|
// next state
|
|
m_state = 3;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
m_samplesDB[m_ptrDB][0] = sampleIn->real();
|
|
m_samplesDB[m_ptrDB][1] = sampleIn->imag();
|
|
m_samplesDB[m_ptrDB + m_sizeDB][0] = sampleIn->real();
|
|
m_samplesDB[m_ptrDB + m_sizeDB][1] = sampleIn->imag();
|
|
|
|
// save result
|
|
doFIRDB(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// advance write-pointer
|
|
m_ptrDB = (m_ptrDB + 1) % m_sizeDB;
|
|
|
|
// next state
|
|
m_state = 0;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
void myDecimate(const Sample* sample1, Sample* sample2)
|
|
{
|
|
m_samples[m_ptr][0] = sample1->real();
|
|
m_samples[m_ptr][1] = sample1->imag();
|
|
m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
|
|
|
|
m_samples[m_ptr][0] = sample2->real();
|
|
m_samples[m_ptr][1] = sample2->imag();
|
|
|
|
doFIR(sample2);
|
|
|
|
m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
|
|
}
|
|
|
|
void myDecimate(qint32 x1, qint32 y1, qint32 *x2, qint32 *y2)
|
|
{
|
|
m_samples[m_ptr][0] = x1;
|
|
m_samples[m_ptr][1] = y1;
|
|
m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
|
|
|
|
m_samples[m_ptr][0] = *x2;
|
|
m_samples[m_ptr][1] = *y2;
|
|
|
|
doFIR(x2, y2);
|
|
|
|
m_ptr = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 1];
|
|
}
|
|
|
|
protected:
|
|
qint32 m_samples[HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1][2]; // Valgrind optim (from qint16)
|
|
qint32 m_samplesDB[2*(HBFIRFilterTraits<HBFilterOrder>::hbOrder - 1)][2]; // double buffer technique
|
|
qint16 m_ptr;
|
|
int m_ptrDB;
|
|
int m_sizeDB;
|
|
int m_state;
|
|
|
|
void doFIRDB(Sample* sample)
|
|
{
|
|
int a = m_ptrDB + m_sizeDB; // tip pointer
|
|
int b = m_ptrDB + 1; // tail pointer
|
|
qint32 iAcc = 0;
|
|
qint32 qAcc = 0;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
iAcc += (m_samplesDB[a][0] + m_samplesDB[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_samplesDB[a][1] + m_samplesDB[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
a -= 2;
|
|
b += 2;
|
|
}
|
|
|
|
iAcc += ((qint32)m_samplesDB[b-1][0]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((qint32)m_samplesDB[b-1][1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
|
|
sample->setReal(iAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
sample->setImag(qAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
}
|
|
|
|
void doFIR(Sample* sample)
|
|
{
|
|
// init read-pointer
|
|
// int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
|
|
// int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1
|
|
// ancient way:
|
|
int a = (m_ptr + 1) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
int b = (m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder - 1)) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
|
|
// go through samples in buffer
|
|
qint32 iAcc = 0;
|
|
qint32 qAcc = 0;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
// 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
|
|
iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
|
|
// update read-pointer
|
|
// a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
|
|
// b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
|
|
// ancient way:
|
|
a = (a + 2) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
b = (b + (HBFIRFilterTraits<HBFilterOrder>::hbOrder - 1)) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
}
|
|
|
|
// a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];
|
|
// ancient way:
|
|
a = (a + HBFIRFilterTraits<HBFilterOrder>::hbOrder) % (HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1);
|
|
|
|
iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
|
|
sample->setReal(iAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
sample->setImag(qAcc >> HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
}
|
|
|
|
void doFIR(qint32 *x, qint32 *y)
|
|
{
|
|
// Coefficents. This is a sinc function:
|
|
// Half of the half of coefficients are stored because:
|
|
// - half of the coefficients are 0
|
|
// - there is a symmertry around the central 0.5 coefficient (not stored either)
|
|
// There are actually order+1 coefficients
|
|
|
|
// init read-pointer
|
|
int a = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 + 1]; // 0 + 1
|
|
int b = HBFIRFilterTraits<HBFilterOrder>::hbMod[m_ptr + 2 - 2]; //-1 - 1
|
|
|
|
// go through samples in buffer
|
|
qint32 iAcc = 0;
|
|
qint32 qAcc = 0;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
// 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
|
|
iAcc += (m_samples[a][0] + m_samples[b][0]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_samples[a][1] + m_samples[b][1]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
|
|
// update read-pointer
|
|
a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 + 2];
|
|
b = HBFIRFilterTraits<HBFilterOrder>::hbMod[b + 2 - 2];
|
|
}
|
|
|
|
a = HBFIRFilterTraits<HBFilterOrder>::hbMod[a + 2 - 1];
|
|
|
|
iAcc += ((qint32)m_samples[a][0] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((qint32)m_samples[a][1] + 1) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
|
|
*x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1); // HB_SHIFT incorrect do not loose the gained bit
|
|
*y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
}
|
|
|
|
};
|
|
|
|
template<uint32_t HBFilterOrder>
|
|
IntHalfbandFilter<HBFilterOrder>::IntHalfbandFilter()
|
|
{
|
|
m_sizeDB = HBFIRFilterTraits<HBFilterOrder>::hbOrder - 1;
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder + 1; i++)
|
|
{
|
|
m_samples[i][0] = 0;
|
|
m_samples[i][1] = 0;
|
|
|
|
if (i < m_sizeDB)
|
|
{
|
|
m_samplesDB[i][0] = 0;
|
|
m_samplesDB[i][1] = 0;
|
|
}
|
|
}
|
|
|
|
m_ptr = 0;
|
|
m_ptrDB = 0;
|
|
|
|
m_state = 0;
|
|
}
|
|
|
|
#endif // INCLUDE_INTHALFBANDFILTER_H
|