radio95/fm95
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Code Issues Activity

small optimazations

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This commit is contained in:
KubaPro010
2025-08-03 20:34:16 +02:00
parent 633d588aa4
commit 345c087fc2
5 changed files with 8 additions and 13 deletions
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7
README.md
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@@ -14,7 +14,6 @@ Supports these inputs:
- Audio (via Pulse)
- MPX (via Pulse, basically passthrough, i don't recommend this unless you have something else than rds or sca to modulate, you could run chimer95 via here)
- RDS (via Pulse, expects unmodulated RDS, rds95 is recommended here, in modulation this is quadrature to the pilot, number of channels is specified by the argument, each of the channels (max 4) go on these freqs: 57, 66.5, 71.25, 76)
- SCA (via Pulse, by default on 67 khz with a 7 khz deviation)
and one output:
@@ -41,11 +40,7 @@ Should run completly fine on a pi 5, fine on a pi 3b (30% cpu, 45% with lpf)
## Other Apps
FM95 also includes some other apps, such as chimer95 which generates GTS tones each half hour, and dcf95 which creates a DCF77 compatible signal, and vban95 now which is a buffered VBAN receiver
## FM95 Calibration
FM95 features a calibration mode `-V` which instead of outputing the MPX just outputs a 400 hz tone, use that tone to match the deviation on your transmitter
FM95 also includes some other apps, such as chimer95 which generates GTS tones each half hour, and dcf95 which creates a DCF77 compatible signal, and vban95 now which is a buffered VBAN receiver. And now also SCA generation was moved to sca95 from fm95!
## Usage of other projects

4
filter/bs412.c
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@@ -11,7 +11,7 @@ inline float deviation_to_dbr(float deviation) {
return 10.0f * (log2f(deviation) - LOG2_19000) * 0.30103f;
}
void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, float attack, float release, float max, int sample_rate) {
void init_bs412(BS412Compressor* mpx, uint32_t mpx_deviation, float target_power, float attack, float release, float max, uint32_t sample_rate) {
mpx->mpx_deviation = mpx_deviation;
mpx->average_counter = 0;
mpx->average = 0;
@@ -26,7 +26,7 @@ void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, f
#endif
}
float soft_clip_tanh(float sample, float threshold) {
inline float soft_clip_tanh(float sample, float threshold) {
if (fabsf(sample) <= threshold) {
return sample; // Linear region
}

6
filter/bs412.h
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@@ -13,8 +13,8 @@
typedef struct
{
int mpx_deviation;
int average_counter;
uint32_t mpx_deviation;
uint32_t average_counter;
uint32_t sample_rate;
float target;
float attack;
@@ -27,5 +27,5 @@ typedef struct
float dbr_to_deviation(float dbr);
float deviation_to_dbr(float deviation);
void init_bs412(BS412Compressor *mpx, float mpx_deviation, float target_power, float attack, float release, float max, int sample_rate);
void init_bs412(BS412Compressor *mpx, uint32_t mpx_deviation, float target_power, float attack, float release, float max, uint32_t sample_rate);
float bs412_compress(BS412Compressor *mpx, float average);

2
filter/gain_control.c
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@@ -1,6 +1,6 @@
#include "gain_control.h"
void initAGC(AGC* agc, int sampleRate, float targetLevel, float minGain, float maxGain, float attackTime, float releaseTime) {
void initAGC(AGC* agc, uint32_t sampleRate, float targetLevel, float minGain, float maxGain, float attackTime, float releaseTime) {
agc->targetLevel = targetLevel;
agc->minGain = minGain;
agc->maxGain = maxGain;

2
filter/gain_control.h
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@@ -21,5 +21,5 @@ typedef struct {
float rmsBeta;
} AGC;
void initAGC(AGC* agc, int sampleRate, float targetLevel, float minGain, float maxGain, float attackTime, float releaseTime);
void initAGC(AGC* agc, uint32_t sampleRate, float targetLevel, float minGain, float maxGain, float attackTime, float releaseTime);
float process_agc(AGC* agc, float sidechain);