radio95/fm95
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remove some

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KubaPro010
2025-01-31 21:01:06 +01:00
parent a2217ecb5e
commit 7d1ee4ae50
3 changed files with 0 additions and 31 deletions
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8
lib/filters.c
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@@ -78,14 +78,6 @@ float hard_clip(float sample, float threshold) {
return sample; // No clipping return sample; // No clipping
} }
} }
float soft_clip(float sample, float threshold) {
if (fabs(sample) <= threshold) {
return sample; // Linear region
} else {
float sign = (sample > 0) ? 1.0f : -1.0f;
return sign * (threshold + (1.0f - threshold) * pow(fabs(sample) - threshold, 0.5f));
}
}
void init_delay_line(DelayLine *delay_line, int max_delay) { void init_delay_line(DelayLine *delay_line, int max_delay) {
delay_line->buffer = (float *)calloc(max_delay, sizeof(float)); delay_line->buffer = (float *)calloc(max_delay, sizeof(float));

1
lib/filters.h
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@@ -25,7 +25,6 @@ void init_hpf(BiquadFilter* filter, float cutoffFreq, float qFactor, float sampl
float apply_frequency_filter(BiquadFilter* filter, float input); float apply_frequency_filter(BiquadFilter* filter, float input);
float hard_clip(float sample, float threshold); float hard_clip(float sample, float threshold);
float soft_clip(float sample, float threshold);
typedef struct { typedef struct {
float *buffer; float *buffer;

22
src/fm95.c
View File

@@ -10,7 +10,6 @@
#define DEFAULT_STEREO_POLAR 0 #define DEFAULT_STEREO_POLAR 0
#define DEFAULT_STEREO_SSB 0 #define DEFAULT_STEREO_SSB 0
#define DEFAULT_CLIPPER_THRESHOLD 1.0f #define DEFAULT_CLIPPER_THRESHOLD 1.0f
#define DEFAULT_SOFT_CLIPPER_THRESHOLD 0.95f
#define DEFAULT_SCA_FREQUENCY 67000.0f #define DEFAULT_SCA_FREQUENCY 67000.0f
#define DEFAULT_SCA_DEVIATION 7000.0f #define DEFAULT_SCA_DEVIATION 7000.0f
#define DEFAULT_SCA_CLIPPER_THRESHOLD 1.0f // Full deviation, if you set this to 0.5 then you may as well set the deviation to 3.5k #define DEFAULT_SCA_CLIPPER_THRESHOLD 1.0f // Full deviation, if you set this to 0.5 then you may as well set the deviation to 3.5k
@@ -44,8 +43,6 @@
#define MPX_VOLUME 1.0f #define MPX_VOLUME 1.0f
#define LPF_CUTOFF 15000 // Should't need to be changed #define LPF_CUTOFF 15000 // Should't need to be changed
#define HPF_CUTOFF 30 // Unless you wanna have SOME bass then leave this alone
#define CENTER_BASS 50 // Bass upto this will be mono
volatile sig_atomic_t to_run = 1; volatile sig_atomic_t to_run = 1;
@@ -79,7 +76,6 @@ void show_help(char *name) {
" -F,--sca_dev Override the SCA deviation [default: %.2f]\n" " -F,--sca_dev Override the SCA deviation [default: %.2f]\n"
" -L,--sca_clip Override the SCA clipper threshold [default: %.2f]\n" " -L,--sca_clip Override the SCA clipper threshold [default: %.2f]\n"
" -c,--clipper Override the clipper threshold [default: %.2f]\n" " -c,--clipper Override the clipper threshold [default: %.2f]\n"
" -l,--soft_clip Override the soft clipper threshold [default: %.2f]\n"
" -P,--polar Force Polar Stereo (does not take effect with -m%s)\n" " -P,--polar Force Polar Stereo (does not take effect with -m%s)\n"
" -g,--ge Force Zenith/GE stereo (does not take effect with -m%s)\n" " -g,--ge Force Zenith/GE stereo (does not take effect with -m%s)\n"
" -S,--ssb Force SSB [default: %d]\n" " -S,--ssb Force SSB [default: %d]\n"
@@ -106,7 +102,6 @@ void show_help(char *name) {
,DEFAULT_SCA_DEVIATION ,DEFAULT_SCA_DEVIATION
,DEFAULT_SCA_CLIPPER_THRESHOLD ,DEFAULT_SCA_CLIPPER_THRESHOLD
,DEFAULT_CLIPPER_THRESHOLD ,DEFAULT_CLIPPER_THRESHOLD
,DEFAULT_SOFT_CLIPPER_THRESHOLD
,(DEFAULT_STEREO_POLAR == 1) ? ", default" : "" ,(DEFAULT_STEREO_POLAR == 1) ? ", default" : ""
,(DEFAULT_STEREO_POLAR == 1) ? "" : ", default" ,(DEFAULT_STEREO_POLAR == 1) ? "" : ", default"
,DEFAULT_STEREO_SSB ,DEFAULT_STEREO_SSB
@@ -124,7 +119,6 @@ int main(int argc, char **argv) {
pa_simple *output_device; pa_simple *output_device;
float clipper_threshold = DEFAULT_CLIPPER_THRESHOLD; float clipper_threshold = DEFAULT_CLIPPER_THRESHOLD;
float soft_clipper_threshold = DEFAULT_SOFT_CLIPPER_THRESHOLD;
int stereo = DEFAULT_STEREO; int stereo = DEFAULT_STEREO;
int polar_stereo = DEFAULT_STEREO_POLAR; int polar_stereo = DEFAULT_STEREO_POLAR;
int ssb = DEFAULT_STEREO_SSB; int ssb = DEFAULT_STEREO_SSB;
@@ -165,7 +159,6 @@ int main(int argc, char **argv) {
{"sca_dev", required_argument, NULL, 'F'}, {"sca_dev", required_argument, NULL, 'F'},
{"sca_clip", required_argument, NULL, 'L'}, {"sca_clip", required_argument, NULL, 'L'},
{"clipper", required_argument, NULL, 'c'}, {"clipper", required_argument, NULL, 'c'},
{"soft_clip", required_argument, NULL, 'l'},
{"polar", no_argument, NULL, 'P'}, {"polar", no_argument, NULL, 'P'},
{"ge", no_argument, NULL, 'g'}, {"ge", no_argument, NULL, 'g'},
{"ssb", no_argument, NULL, 'S'}, {"ssb", no_argument, NULL, 'S'},
@@ -211,9 +204,6 @@ int main(int argc, char **argv) {
case 'c': //Clipper case 'c': //Clipper
clipper_threshold = strtof(optarg, NULL); clipper_threshold = strtof(optarg, NULL);
break; break;
case 'l': //Soft Clipper
soft_clipper_threshold = strtof(optarg, NULL);
break;
case 'P': //Polar case 'P': //Polar
polar_stereo = 1; polar_stereo = 1;
break; break;
@@ -403,13 +393,6 @@ int main(int argc, char **argv) {
BiquadFilter lpf_l, lpf_r; BiquadFilter lpf_l, lpf_r;
init_lpf(&lpf_l, LPF_CUTOFF, 1.0f, SAMPLE_RATE); init_lpf(&lpf_l, LPF_CUTOFF, 1.0f, SAMPLE_RATE);
init_lpf(&lpf_r, LPF_CUTOFF, 1.0f, SAMPLE_RATE); init_lpf(&lpf_r, LPF_CUTOFF, 1.0f, SAMPLE_RATE);
BiquadFilter hpf_l, hpf_r;
init_hpf(&hpf_l, HPF_CUTOFF, 1.0f, SAMPLE_RATE);
init_hpf(&hpf_r, HPF_CUTOFF, 1.0f, SAMPLE_RATE);
BiquadFilter bass_hpf;
init_hpf(&bass_hpf, CENTER_BASS, 1.0f, SAMPLE_RATE);
// #endregion // #endregion
signal(SIGINT, stop); signal(SIGINT, stop);
@@ -452,19 +435,14 @@ int main(int argc, char **argv) {
float ready_l = apply_frequency_filter(&lpf_l, l_in); float ready_l = apply_frequency_filter(&lpf_l, l_in);
float ready_r = apply_frequency_filter(&lpf_r, r_in); float ready_r = apply_frequency_filter(&lpf_r, r_in);
ready_l = apply_frequency_filter(&hpf_l, ready_l);
ready_r = apply_frequency_filter(&hpf_r, ready_r);
ready_l = apply_preemphasis(&preemp_l, ready_l); ready_l = apply_preemphasis(&preemp_l, ready_l);
ready_r = apply_preemphasis(&preemp_r, ready_r); ready_r = apply_preemphasis(&preemp_r, ready_r);
ready_l = soft_clip(ready_l, soft_clipper_threshold);
ready_r = soft_clip(ready_r, soft_clipper_threshold);
ready_l = hard_clip(ready_l, clipper_threshold); ready_l = hard_clip(ready_l, clipper_threshold);
ready_r = hard_clip(ready_r, clipper_threshold); ready_r = hard_clip(ready_r, clipper_threshold);
float mono = (ready_l + ready_r) / 2.0f; // Stereo to Mono float mono = (ready_l + ready_r) / 2.0f; // Stereo to Mono
if(stereo == 1) { if(stereo == 1) {
float stereo = (ready_l - ready_r) / 2.0f; // Also Stereo to Mono but a bit diffrent float stereo = (ready_l - ready_r) / 2.0f; // Also Stereo to Mono but a bit diffrent
if(CENTER_BASS != 0) stereo = apply_frequency_filter(&bass_hpf, stereo);
float stereo_i, stereo_q; float stereo_i, stereo_q;
if(ssb) { if(ssb) {