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Implement HighShelf

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This commit is contained in:
Iscle 2022-09-18 05:12:26 +02:00
parent a0034f3acc
commit 83563168ea
3 changed files with 56 additions and 29 deletions
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12
src/cpp/viper/utils/Biquad.h
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@ -1,6 +1,5 @@
#pragma once #pragma once
#include <cstdint> #include <cstdint>
class Biquad { class Biquad {
@ -15,6 +14,13 @@ public:
void SetLowPassParameter(double frequency, double samplingRate, double qFactor); void SetLowPassParameter(double frequency, double samplingRate, double qFactor);
private: private:
double y_2, y_1, x_2, x_1; double x_1;
double b0, b1, b2, a1, a2; double x_2;
double y_1;
double y_2;
double a1;
double a2;
double b0;
double b1;
double b2;
}; };

42
src/cpp/viper/utils/HighShelf.cpp
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@ -1,9 +1,8 @@
#include <cmath>
#include "HighShelf.h" #include "HighShelf.h"
#include <cmath>
float HighShelf::Process(float sample) { double HighShelf::Process(double sample) {
float out = sample * this->b0 + this->x_1 * this->b1 + this->x_2 * this->b2 + this->y_1 * this->a1 + double out = (((this->x_1 * this->b1 + sample * this->b0 + this->b2 * this->x_2) - this->y_1 * this->a1) - this->a2 * this->y_2) * this->a0;
this->y_2 * this->a2;
this->y_2 = this->y_1; this->y_2 = this->y_1;
this->y_1 = out; this->y_1 = out;
this->x_2 = this->x_1; this->x_2 = this->x_1;
@ -11,18 +10,37 @@ float HighShelf::Process(float sample) {
return out; return out;
} }
void HighShelf::SetFrequency(uint32_t freq) { void HighShelf::SetFrequency(double freq) {
this->frequency = freq; this->frequency = freq;
} }
void HighShelf::SetGain(float gain) { void HighShelf::SetGain(double gain) {
this->gain = 20.f * log10f(gain); this->gain = log10(gain) * 20.0;
} }
void HighShelf::SetQuality(float q) { void HighShelf::SetSamplingRate(double samplingRate) {
this->quality = q; double x = (2 * M_PI * this->frequency) / samplingRate;
} double sinX = sin(x);
double cosX = cos(x);
double y = exp((this->gain * log(10.0)) / 40.0);
void HighShelf::SetSamplingRate(uint32_t samplerate) { this->x_1 = 0.0;
this->samplerate = samplerate; this->x_2 = 0.0;
this->y_1 = 0.0;
this->y_2 = 0.0;
double z = sqrt(y * 2.0) * sinX;
double a = (y - 1.0) * cosX;
double b = (y + 1.0) - a;
double c = z + b;
double d = (y + 1.0) * cosX;
double e = (y + 1.0) + a;
double f = (y - 1.0) - d;
this->a0 = 1.0 / c;
this->a1 = a * 2.0;
this->a2 = b - z;
this->b0 = (e + z) * y;
this->b1 = -y * 2.0 * ((y - 1.0) + d);
this->b2 = (e - z) * y;
} }

31
src/cpp/viper/utils/HighShelf.h
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@ -4,21 +4,24 @@
class HighShelf { class HighShelf {
public: public:
float Process(float sample); double Process(double sample);
void SetFrequency(double freq);
void SetGain(double gain);
void SetSamplingRate(double samplingRate);
void SetFrequency(uint32_t freq); private:
double frequency;
void SetGain(float gain); double gain;
double x_1;
void SetQuality(float q); double x_2;
double y_1;
void SetSamplingRate(uint32_t samplerate); double y_2;
double b0;
uint32_t frequency, samplerate; double b1;
float quality, gain; double b2;
double a0;
float y_2, y_1, x_2, x_1; double a1;
float b0, b1, b2, a1, a2; double a2;
}; };