mirror of
https://github.com/radio95-rnt/fm95.git
synced 2026-02-27 03:23:54 +01:00
15 lines
452 B
C
15 lines
452 B
C
#include "filters.h"
|
|
|
|
void init_preemphasis(ResistorCapacitor *filter, float tau, float sample_rate) {
|
|
filter->prev_sample = 0.0f;
|
|
filter->alpha = exp(-1 / (tau*sample_rate));
|
|
}
|
|
float apply_preemphasis(ResistorCapacitor *filter, float sample) {
|
|
float out = sample-filter->alpha*filter->prev_sample;
|
|
filter->prev_sample = sample;
|
|
return out;
|
|
}
|
|
|
|
float hard_clip(float sample, float threshold) {
|
|
return fmaxf(-threshold, fminf(threshold, sample));
|
|
} |