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KubaPro010
2025-03-27 18:41:56 +01:00
parent abc6922852
commit ed44dbcad2
3 changed files with 35 additions and 57 deletions
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24
lib/filters.h
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@@ -5,6 +5,8 @@
#include "constants.h"
#include "oscillator.h"
#define FIR_ORDER 10
typedef struct
{
float alpha;
@@ -19,16 +21,12 @@ float hard_clip(float sample, float threshold);
typedef struct
{
float b0, b1, b2;
float a1, a2;
float x1, x2;
float y1, y2;
} Biquad;
typedef struct {
Biquad section1;
Biquad section2;
} LPF4;
void init_lpf(Biquad* filter, float sample_rate, float cutoff_freq, float Q);
void init_lpf4(LPF4* filter, float sample_rate, float cutoff_freq);
float apply_lpf4(LPF4* filter, float input);
float biquad(Biquad *filter, float input);
float A[FIR_ORDER];
float d1[FIR_ORDER];
float d2[FIR_ORDER];
float w0[FIR_ORDER];
float w1[FIR_ORDER];
float w2[FIR_ORDER];
} FIR;
void init_lpf(FIR *filter, float cutoff, int sample_rate);
float process_lpf(FIR *filter, float x);