radio95/fm95
0
1
Fork 0
mirror of https://github.com/radio95-rnt/fm95.git synced 2026-02-26 19:23:51 +01:00
Code Issues Activity

make bs412 measure output

Browse Source
This commit is contained in:
KubaPro010
2026-01-23 22:39:49 +01:00
parent 13dcf3c726
commit f938e26c80
2 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
filter/bs412.c
View File

@@ -22,13 +22,14 @@ void init_bs412(BS412Compressor* mpx, uint32_t mpx_deviation, float target_power
mpx->gain = 0.0f; mpx->gain = 0.0f;
mpx->can_compress = 0; mpx->can_compress = 0;
mpx->second_counter = 0; mpx->second_counter = 0;
mpx->last_output = 0.0f;
#ifdef BS412_DEBUG #ifdef BS412_DEBUG
debug_printf("Initialized MPX power measurement with sample rate: %d\n", sample_rate); debug_printf("Initialized MPX power measurement with sample rate: %d\n", sample_rate);
#endif #endif
} }
float bs412_compress(BS412Compressor* mpx, float sample) { float bs412_compress(BS412Compressor* mpx, float sample) {
mpx->avg_power += mpx->alpha * ((sample * sample * mpx->mpx_deviation * mpx->mpx_deviation) - mpx->avg_power); mpx->avg_power += mpx->alpha * ((mpx->last_output * mpx->last_output * mpx->mpx_deviation * mpx->mpx_deviation) - mpx->avg_power);
float avg_deviation = sqrtf(mpx->avg_power); float avg_deviation = sqrtf(mpx->avg_power);
float modulation_power = deviation_to_dbr(avg_deviation); float modulation_power = deviation_to_dbr(avg_deviation);
@@ -84,5 +85,7 @@ float bs412_compress(BS412Compressor* mpx, float sample) {
} }
mpx->sample_counter++; mpx->sample_counter++;
mpx->last_output = output_sample;
return output_sample; return output_sample;
} }

1
filter/bs412.h
View File

@@ -24,6 +24,7 @@ typedef struct
double alpha; double alpha;
uint8_t can_compress : 1; uint8_t can_compress : 1;
uint8_t second_counter; uint8_t second_counter;
float last_output;
} BS412Compressor; } BS412Compressor;
float dbr_to_deviation(float dbr); float dbr_to_deviation(float dbr);