radio95/fm95
0
1
Fork 0
mirror of https://github.com/radio95-rnt/fm95.git synced 2026-02-27 03:23:54 +01:00
Code Issues Activity

change vban max packet size, add a rds2 device to fm95 and others

Browse Source
This commit is contained in:
KubaPro010
2025-05-30 17:28:19 +02:00
parent 14630e5c7f
commit 7213c3b13d
7 changed files with 85 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
dsp/bs412.c
View File

@@ -1,10 +1,10 @@
#include "bs412.h"
float dbr_to_deviation(float dbr) {
inline float dbr_to_deviation(float dbr) {
return 19000.0f * powf(10.0f, dbr / 10.0f);
}
float deviation_to_dbr(float deviation) {
inline float deviation_to_dbr(float deviation) {
if(deviation == 0.0f) return -100.0f;
return 10 * log10f(deviation / 19000.0f);
}

10
dsp/filters.c
View File

@@ -1,16 +1,18 @@
#include "filters.h"
void init_preemphasis(ResistorCapacitor *filter, float tau, float sample_rate) {
filter->prev_sample = 0.0f;
filter->alpha = expf(-1 / (tau*sample_rate));
float dt = 1.0f / sample_rate;
filter->alpha = tau / (tau + dt);
filter->gain = 1.0f / sqrtf(1.0f - filter->alpha);
filter->prev_sample = 0.0f;
}
float apply_preemphasis(ResistorCapacitor *filter, float sample) {
inline float apply_preemphasis(ResistorCapacitor *filter, float sample) {
float out = (sample - filter->alpha * filter->prev_sample) * filter->gain;
filter->prev_sample = sample;
return out;
}
float hard_clip(float sample, float threshold) {
inline float hard_clip(float sample, float threshold) {
return fmaxf(-threshold, fminf(threshold, sample));
}

2
dsp/oscillator.c
View File

@@ -6,7 +6,7 @@ void init_oscillator(Oscillator *osc, float frequency, float sample_rate) {
osc->sample_rate = sample_rate;
}
void change_oscillator_frequency(Oscillator *osc, float frequency) {
inline void change_oscillator_frequency(Oscillator *osc, float frequency) {
osc->phase_increment = (M_2PI * frequency) / osc->sample_rate;
}