mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-09-08 22:26:33 -04:00
935 lines
30 KiB
C++
935 lines
30 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2018 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// Integer half-band FIR based interpolator and decimator //
|
|
// This is the even/odd double buffer variant. Really useful only when SIMD is //
|
|
// used //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef SDRBASE_DSP_INTHALFBANDFILTEREO_H_
|
|
#define SDRBASE_DSP_INTHALFBANDFILTEREO_H_
|
|
|
|
#include <stdint.h>
|
|
#include <cstdlib>
|
|
#include "dsp/dsptypes.h"
|
|
#include "dsp/hbfiltertraits.h"
|
|
#include "export.h"
|
|
|
|
template<typename EOStorageType, typename AccuType, uint32_t HBFilterOrder>
|
|
class SDRBASE_API IntHalfbandFilterEO {
|
|
public:
|
|
IntHalfbandFilterEO();
|
|
|
|
// downsample by 2, return center part of original spectrum
|
|
bool workDecimateCenter(Sample* sample)
|
|
{
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sample->real(), (FixReal) sample->imag());
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 1;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
default:
|
|
// save result
|
|
doFIR(sample);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 0;
|
|
|
|
// tell caller we have a new sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// upsample by 2, return center part of original spectrum - double buffer variant
|
|
bool workInterpolateCenterZeroStuffing(Sample* sampleIn, Sample *SampleOut)
|
|
{
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
// save result
|
|
doFIR(SampleOut);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 1;
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
|
|
// save result
|
|
doFIR(SampleOut);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 0;
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/** Optimized upsampler by 2 not calculating FIR with inserted null samples */
|
|
bool workInterpolateCenter(Sample* sampleIn, Sample *SampleOut)
|
|
{
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// return the middle peak
|
|
SampleOut->setReal(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]);
|
|
SampleOut->setImag(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]);
|
|
m_state = 1; // next state
|
|
return false; // tell caller we didn't consume the sample
|
|
|
|
default:
|
|
// calculate with non null samples
|
|
doInterpolateFIR(SampleOut);
|
|
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
m_state = 0; // next state
|
|
return true; // tell caller we consumed the sample
|
|
}
|
|
}
|
|
|
|
bool workDecimateCenter(int32_t *x, int32_t *y)
|
|
{
|
|
// insert sample into ring-buffer
|
|
storeSample32(*x, *y);
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 1;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
default:
|
|
// save result
|
|
doFIR(x, y);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 0;
|
|
// tell caller we have a new sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// downsample by 2, return lower half of original spectrum
|
|
bool workDecimateLowerHalf(Sample* sample)
|
|
{
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) -sample->imag(), (FixReal) sample->real());
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 1;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
case 1:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) -sample->real(), (FixReal) -sample->imag());
|
|
// save result
|
|
doFIR(sample);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 2;
|
|
// tell caller we have a new sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sample->imag(), (FixReal) -sample->real());
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 3;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sample->real(), (FixReal) sample->imag());
|
|
// save result
|
|
doFIR(sample);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 0;
|
|
// tell caller we have a new sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// upsample by 2, from lower half of original spectrum - double buffer variant
|
|
bool workInterpolateLowerHalfZeroStuffing(Sample* sampleIn, Sample *sampleOut)
|
|
{
|
|
Sample s;
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.imag());
|
|
sampleOut->setImag(-s.real());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 1;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
case 1:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(-s.real());
|
|
sampleOut->setImag(-s.imag());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 2;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(-s.imag());
|
|
sampleOut->setImag(s.real());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 3;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 0;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/** Optimized upsampler by 2 not calculating FIR with inserted null samples */
|
|
bool workInterpolateLowerHalf(Sample* sampleIn, Sample *sampleOut)
|
|
{
|
|
Sample s;
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// return the middle peak
|
|
sampleOut->setReal(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // imag
|
|
sampleOut->setImag(-m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // - real
|
|
m_state = 1; // next state
|
|
return false; // tell caller we didn't consume the sample
|
|
|
|
case 1:
|
|
// calculate with non null samples
|
|
doInterpolateFIR(&s);
|
|
sampleOut->setReal(-s.real());
|
|
sampleOut->setImag(-s.imag());
|
|
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
m_state = 2; // next state
|
|
return true; // tell caller we consumed the sample
|
|
|
|
case 2:
|
|
// return the middle peak
|
|
sampleOut->setReal(-m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // - imag
|
|
sampleOut->setImag(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // real
|
|
m_state = 3; // next state
|
|
return false; // tell caller we didn't consume the sample
|
|
|
|
default:
|
|
// calculate with non null samples
|
|
doInterpolateFIR(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
m_state = 0; // next state
|
|
return true; // tell caller we consumed the sample
|
|
}
|
|
}
|
|
|
|
// downsample by 2, return upper half of original spectrum
|
|
bool workDecimateUpperHalf(Sample* sample)
|
|
{
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sample->imag(), (FixReal) -sample->real());
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 1;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
case 1:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) -sample->real(), (FixReal) -sample->imag());
|
|
// save result
|
|
doFIR(sample);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 2;
|
|
// tell caller we have a new sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) -sample->imag(), (FixReal) sample->real());
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 3;
|
|
// tell caller we don't have a new sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sample->real(), (FixReal) sample->imag());
|
|
// save result
|
|
doFIR(sample);
|
|
// advance write-pointer
|
|
advancePointer();
|
|
// next state
|
|
m_state = 0;
|
|
// tell caller we have a new sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// upsample by 2, move original spectrum to upper half - double buffer variant
|
|
bool workInterpolateUpperHalfZeroStuffing(Sample* sampleIn, Sample *sampleOut)
|
|
{
|
|
Sample s;
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(-s.imag());
|
|
sampleOut->setImag(s.real());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 1;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
case 1:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(-s.real());
|
|
sampleOut->setImag(-s.imag());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 2;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
|
|
case 2:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.imag());
|
|
sampleOut->setImag(-s.real());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 3;
|
|
|
|
// tell caller we didn't consume the sample
|
|
return false;
|
|
|
|
default:
|
|
// insert sample into ring-buffer
|
|
storeSample((FixReal) sampleIn->real(), (FixReal) sampleIn->imag());
|
|
|
|
// save result
|
|
doFIR(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// advance write-pointer
|
|
advancePointer();
|
|
|
|
// next state
|
|
m_state = 0;
|
|
|
|
// tell caller we consumed the sample
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/** Optimized upsampler by 2 not calculating FIR with inserted null samples */
|
|
bool workInterpolateUpperHalf(Sample* sampleIn, Sample *sampleOut)
|
|
{
|
|
Sample s;
|
|
|
|
switch(m_state)
|
|
{
|
|
case 0:
|
|
// return the middle peak
|
|
sampleOut->setReal(-m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // - imag
|
|
sampleOut->setImag(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // + real
|
|
m_state = 1; // next state
|
|
return false; // tell caller we didn't consume the sample
|
|
|
|
case 1:
|
|
// calculate with non null samples
|
|
doInterpolateFIR(&s);
|
|
sampleOut->setReal(-s.real());
|
|
sampleOut->setImag(-s.imag());
|
|
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
m_state = 2; // next state
|
|
return true; // tell caller we consumed the sample
|
|
|
|
case 2:
|
|
// return the middle peak
|
|
sampleOut->setReal(m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1]); // + imag
|
|
sampleOut->setImag(-m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0]); // - real
|
|
m_state = 3; // next state
|
|
return false; // tell caller we didn't consume the sample
|
|
|
|
default:
|
|
// calculate with non null samples
|
|
doInterpolateFIR(&s);
|
|
sampleOut->setReal(s.real());
|
|
sampleOut->setImag(s.imag());
|
|
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = sampleIn->real();
|
|
m_samples[m_ptr][1] = sampleIn->imag();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = sampleIn->real();
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = sampleIn->imag();
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
m_state = 0; // next state
|
|
return true; // tell caller we consumed the sample
|
|
}
|
|
}
|
|
|
|
void myDecimate(const Sample* sample1, Sample* sample2)
|
|
{
|
|
storeSample((FixReal) sample1->real(), (FixReal) sample1->imag());
|
|
advancePointer();
|
|
|
|
storeSample((FixReal) sample2->real(), (FixReal) sample2->imag());
|
|
doFIR(sample2);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimate(int32_t x1, int32_t y1, int32_t *x2, int32_t *y2)
|
|
{
|
|
storeSample32(x1, y1);
|
|
advancePointer();
|
|
|
|
storeSample32(*x2, *y2);
|
|
doFIR(x2, y2);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateCen(int32_t x1, int32_t y1, int32_t *x2, int32_t *y2, int32_t x3, int32_t y3, int32_t *x4, int32_t *y4)
|
|
{
|
|
storeSample32(x1, y1);
|
|
advancePointer();
|
|
|
|
storeSample32(*x2, *y2);
|
|
doFIR(x2, y2);
|
|
advancePointer();
|
|
|
|
storeSample32(x3, y3);
|
|
advancePointer();
|
|
|
|
storeSample32(*x4, *y4);
|
|
doFIR(x4, y4);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateCen(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, int32_t x4, int32_t y4, int32_t *out)
|
|
{
|
|
storeSample32(x1, y1);
|
|
advancePointer();
|
|
|
|
storeSample32(x2, y2);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(x3, y3);
|
|
advancePointer();
|
|
|
|
storeSample32(x4, y4);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateCen(int32_t *in, int32_t *out)
|
|
{
|
|
storeSample32(in[0], in[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[2], in[3]);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[4], in[5]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[6], in[7]);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateInf(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, int32_t x4, int32_t y4, int32_t *out)
|
|
{
|
|
storeSample32(-y1, x1);
|
|
advancePointer();
|
|
|
|
storeSample32(-x2, -y2);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(y3, -x3);
|
|
advancePointer();
|
|
|
|
storeSample32(x4, y4);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateInf(int32_t *in, int32_t *out)
|
|
{
|
|
storeSample32(-in[1], in[0]);
|
|
advancePointer();
|
|
|
|
storeSample32(-in[2], -in[3]);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[5], -in[4]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[6], in[7]);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateSup(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t x3, int32_t y3, int32_t x4, int32_t y4, int32_t *out)
|
|
{
|
|
storeSample32(y1, -x1);
|
|
advancePointer();
|
|
|
|
storeSample32(-x2, -y2);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(-y3, x3);
|
|
advancePointer();
|
|
|
|
storeSample32(x4, y4);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
void myDecimateSup(int32_t *in, int32_t *out)
|
|
{
|
|
storeSample32(in[1], -in[0]);
|
|
advancePointer();
|
|
|
|
storeSample32(-in[2], -in[3]);
|
|
doFIR(&out[0], &out[1]);
|
|
advancePointer();
|
|
|
|
storeSample32(-in[5], in[4]);
|
|
advancePointer();
|
|
|
|
storeSample32(in[6], in[7]);
|
|
doFIR(&out[2], &out[3]);
|
|
advancePointer();
|
|
}
|
|
|
|
/** Simple zero stuffing and filter */
|
|
void myInterpolateZeroStuffing(Sample* sample1, Sample* sample2)
|
|
{
|
|
storeSample((FixReal) sample1->real(), (FixReal) sample1->imag());
|
|
doFIR(sample1);
|
|
advancePointer();
|
|
|
|
storeSample((FixReal) 0, (FixReal) 0);
|
|
doFIR(sample2);
|
|
advancePointer();
|
|
}
|
|
|
|
/** Simple zero stuffing and filter */
|
|
void myInterpolateZeroStuffing(int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
|
|
{
|
|
storeSample32(*x1, *y1);
|
|
doFIR(x1, y1);
|
|
advancePointer();
|
|
|
|
storeSample32(0, 0);
|
|
doFIR(x2, y2);
|
|
advancePointer();
|
|
}
|
|
|
|
/** Optimized upsampler by 2 not calculating FIR with inserted null samples */
|
|
void myInterpolate(qint32 *x1, qint32 *y1, qint32 *x2, qint32 *y2)
|
|
{
|
|
// insert sample into ring double buffer
|
|
m_samples[m_ptr][0] = *x1;
|
|
m_samples[m_ptr][1] = *y1;
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][0] = *x1;
|
|
m_samples[m_ptr + HBFIRFilterTraits<HBFilterOrder>::hbOrder/2][1] = *y1;
|
|
|
|
// advance pointer
|
|
if (m_ptr < (HBFIRFilterTraits<HBFilterOrder>::hbOrder/2) - 1) {
|
|
m_ptr++;
|
|
} else {
|
|
m_ptr = 0;
|
|
}
|
|
|
|
// first output sample calculated with the middle peak
|
|
*x1 = m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][0];
|
|
*y1 = m_samples[m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder/4) - 1][1];
|
|
|
|
// second sample calculated with the filter
|
|
doInterpolateFIR(x2, y2);
|
|
}
|
|
|
|
protected:
|
|
EOStorageType m_even[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder];
|
|
EOStorageType m_odd[2][HBFIRFilterTraits<HBFilterOrder>::hbOrder];
|
|
int32_t m_samples[HBFIRFilterTraits<HBFilterOrder>::hbOrder][2];
|
|
|
|
int m_ptr;
|
|
int m_size;
|
|
int m_state;
|
|
|
|
void storeSample(const FixReal& sampleI, const FixReal& sampleQ)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
m_even[0][m_ptr/2] = sampleI;
|
|
m_even[1][m_ptr/2] = sampleQ;
|
|
m_even[0][m_ptr/2 + m_size] = sampleI;
|
|
m_even[1][m_ptr/2 + m_size] = sampleQ;
|
|
}
|
|
else
|
|
{
|
|
m_odd[0][m_ptr/2] = sampleI;
|
|
m_odd[1][m_ptr/2] = sampleQ;
|
|
m_odd[0][m_ptr/2 + m_size] = sampleI;
|
|
m_odd[1][m_ptr/2 + m_size] = sampleQ;
|
|
}
|
|
}
|
|
|
|
void storeSample32(int32_t x, int32_t y)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
m_even[0][m_ptr/2] = x;
|
|
m_even[1][m_ptr/2] = y;
|
|
m_even[0][m_ptr/2 + m_size] = x;
|
|
m_even[1][m_ptr/2 + m_size] = y;
|
|
}
|
|
else
|
|
{
|
|
m_odd[0][m_ptr/2] = x;
|
|
m_odd[1][m_ptr/2] = y;
|
|
m_odd[0][m_ptr/2 + m_size] = x;
|
|
m_odd[1][m_ptr/2 + m_size] = y;
|
|
}
|
|
}
|
|
|
|
void advancePointer()
|
|
{
|
|
m_ptr = m_ptr + 1 < 2*m_size ? m_ptr + 1: 0;
|
|
}
|
|
|
|
void doFIR(Sample* sample)
|
|
{
|
|
AccuType iAcc = 0;
|
|
AccuType qAcc = 0;
|
|
|
|
int a = m_ptr/2 + m_size; // tip pointer
|
|
int b = m_ptr/2 + 1; // tail pointer
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += (m_even[0][a] + m_even[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
else
|
|
{
|
|
iAcc += (m_odd[0][a] + m_odd[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
|
|
a -= 1;
|
|
b += 1;
|
|
}
|
|
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += ((int32_t)m_odd[0][m_ptr/2 + m_size/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((int32_t)m_odd[1][m_ptr/2 + m_size/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
}
|
|
else
|
|
{
|
|
iAcc += ((int32_t)m_even[0][m_ptr/2 + m_size/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((int32_t)m_even[1][m_ptr/2 + m_size/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
}
|
|
|
|
sample->setReal(iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
|
|
sample->setImag(qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
|
|
}
|
|
|
|
void doFIR(int32_t *x, int32_t *y)
|
|
{
|
|
AccuType iAcc = 0;
|
|
AccuType qAcc = 0;
|
|
|
|
int a = m_ptr/2 + m_size; // tip pointer
|
|
int b = m_ptr/2 + 1; // tail pointer
|
|
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += (m_even[0][a] + m_even[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_even[1][a] + m_even[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
else
|
|
{
|
|
iAcc += (m_odd[0][a] + m_odd[0][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
qAcc += (m_odd[1][a] + m_odd[1][b]) * HBFIRFilterTraits<HBFilterOrder>::hbCoeffs[i];
|
|
}
|
|
|
|
a -= 1;
|
|
b += 1;
|
|
}
|
|
|
|
if ((m_ptr % 2) == 0)
|
|
{
|
|
iAcc += ((int32_t)m_odd[0][m_ptr/2 + m_size/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((int32_t)m_odd[1][m_ptr/2 + m_size/2]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
}
|
|
else
|
|
{
|
|
iAcc += ((int32_t)m_even[0][m_ptr/2 + m_size/2 + 1]) << (HBFIRFilterTraits<HBFilterOrder>::hbShift - 1);
|
|
qAcc += ((int32_t)m_even[1][m_ptr/2 + m_size/2 + 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);
|
|
}
|
|
|
|
void doInterpolateFIR(Sample* sample)
|
|
{
|
|
AccuType iAcc = 0;
|
|
AccuType qAcc = 0;
|
|
|
|
qint16 a = m_ptr;
|
|
qint16 b = m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder / 2) - 1;
|
|
|
|
// go through samples in buffer
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
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];
|
|
a++;
|
|
b--;
|
|
}
|
|
|
|
sample->setReal(iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
|
|
sample->setImag(qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1));
|
|
}
|
|
|
|
void doInterpolateFIR(qint32 *x, qint32 *y)
|
|
{
|
|
AccuType iAcc = 0;
|
|
AccuType qAcc = 0;
|
|
|
|
qint16 a = m_ptr;
|
|
qint16 b = m_ptr + (HBFIRFilterTraits<HBFilterOrder>::hbOrder / 2) - 1;
|
|
|
|
// go through samples in buffer
|
|
for (int i = 0; i < HBFIRFilterTraits<HBFilterOrder>::hbOrder / 4; i++)
|
|
{
|
|
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];
|
|
a++;
|
|
b--;
|
|
}
|
|
|
|
*x = iAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
*y = qAcc >> (HBFIRFilterTraits<HBFilterOrder>::hbShift -1);
|
|
}
|
|
};
|
|
|
|
template<typename EOStorageType, typename AccuType, uint32_t HBFilterOrder>
|
|
IntHalfbandFilterEO<EOStorageType, AccuType, HBFilterOrder>::IntHalfbandFilterEO()
|
|
{
|
|
m_size = HBFIRFilterTraits<HBFilterOrder>::hbOrder/2;
|
|
|
|
for (int i = 0; i < 2*m_size; i++)
|
|
{
|
|
m_even[0][i] = 0;
|
|
m_even[1][i] = 0;
|
|
m_odd[0][i] = 0;
|
|
m_odd[1][i] = 0;
|
|
m_samples[i][0] = 0;
|
|
m_samples[i][1] = 0;
|
|
}
|
|
|
|
m_ptr = 0;
|
|
m_state = 0;
|
|
}
|
|
|
|
#endif /* SDRBASE_DSP_INTHALFBANDFILTEREO_H_ */
|