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PolesFilter

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This commit is contained in:
Martijn 2021-07-28 13:31:55 +02:00
parent 847dd91ea1
commit c9453995e5
3 changed files with 107 additions and 0 deletions
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1
CMakeLists.txt
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@ -35,6 +35,7 @@ set(FILES
src/utils/IIR_NOrder_BW_LH.cpp src/utils/IIR_NOrder_BW_LH.cpp
src/utils/MultiBiquad.cpp src/utils/MultiBiquad.cpp
src/utils/PassFilter.cpp src/utils/PassFilter.cpp
src/utils/PolesFilter.cpp
src/utils/TimeConstDelay.cpp src/utils/TimeConstDelay.cpp
) )

69
src/utils/PolesFilter.cpp Normal file
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@ -0,0 +1,69 @@
//
// Created by mart on 7/28/21.
//
#include "PolesFilter.h"
#include "../constants.h"
#include <cstring>
#include <cmath>
PolesFilter::PolesFilter() {
this->samplerate = DEFAULT_SAMPLERATE;
this->lower_freq = 160;
this->upper_freq = 8000;
UpdateCoeff();
}
void PolesFilter::Reset() {
UpdateCoeff();
}
void PolesFilter::UpdateCoeff() {
memset(&this->channels[0], 0, sizeof(channel));
memset(&this->channels[1], 0, sizeof(channel));
this->channels[0].lower_angle = ((float)this->lower_freq * M_PI / (float)this->samplerate);
this->channels[1].lower_angle = ((float)this->lower_freq * M_PI / (float)this->samplerate);
this->channels[0].upper_angle = ((float)this->upper_freq * M_PI / (float)this->samplerate);
this->channels[1].upper_angle = ((float)this->upper_freq * M_PI / (float)this->samplerate);
}
inline void DoFilterSide(channel* side, float sample, float* out1, float* out2, float* out3) {
float oldestSampleIn = this->in[2];
this->in[2] = this->in[1];
this->in[1] = this->in[0];
this->in[0] = sample;
channel->x[0] += channel->lower_angle * (sample - channel->x[0]);
channel->x[1] += channel->lower_angle * (channel->x[0] - channel->x[1]);
channel->x[2] += channel->lower_angle * (channel->x[1] - channel->x[2]);
channel->x[3] += channel->lower_angle * (channel->x[2] - channel->x[3]);
channel->y[0] += channel->upper_angle * (sample - channel->y[0]);
channel->y[1] += channel->upper_angle * (channel->y[0] - channel->y[1]);
channel->y[2] += channel->upper_angle * (channel->y[1] - channel->y[2]);
channel->y[3] += channel->upper_angle * (channel->y[2] - channel->y[3]);
*out1 = channel->x[3];
*out2 = oldestSampleIn - channel->y[3];
*out3 = channel->y[3] - channel->x[3];
}
void PolesFilter::DoFilterLeft(float sample, float *out1, float *out2, float *out3) {
DoFilterSide(&this->channels[0], sample, out1, out2, out3);
}
void PolesFilter::DoFilterRight(float sample, float *out1, float *out2, float *out3) {
DoFilterSide(&this->channels[1], sample, out1, out2, out3);
}
void PolesFilter::SetPassFilter(uint32_t lower_freq, uint32_t upper_freq) {
this->lower_freq = lower_freq;
this->upper_freq = upper_freq;
UpdateCoeff();
}
void PolesFilter::SetSamplingRate(uint32_t samplerate) {
this->samplerate = samplerate;
UpdateCoeff();
}

37
src/utils/PolesFilter.h Normal file
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@ -0,0 +1,37 @@
//
// Created by mart on 7/28/21.
//
#pragma once
#include <cstdint>
typedef struct {
float lower_angle;
float upper_angle;
float in[3];
float x[4];
float y[4];
} channel;
class PolesFilter {
public:
PolesFilter();
void Reset();
void UpdateCoeff();
void DoFilterLeft(float sample, float* out1, float* out2, float* out3);
void DoFilterRight(float sample, float* out1, float* out2, float* out3);
void SetPassFilter(uint32_t lower_freq, uint32_t upper_freq);
void SetSamplingRate(uint32_t samplerate);
channel channels[2];
uint32_t lower_freq;
uint32_t upper_freq;
uint32_t samplerate;
};