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Code Issues Activity

adjust lpf quality (make it less precise, more of a slope)

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kuba
2025-03-08 21:06:08 +01:00
parent 90fabff616
commit 6a5d199483
2 changed files with 7 additions and 6 deletions
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.vscode/.server-controller-port.log
Vendored
+1 -1
View File
@@ -1,5 +1,5 @@
{ {
"port": 13452, "port": 13452,
"time": 1741458712922, "time": 1741463839184,
"version": "0.0.3" "version": "0.0.3"
} }
src/fm95.c
+6 -5
View File
@@ -8,7 +8,7 @@
#define DEFAULT_STEREO 1 #define DEFAULT_STEREO 1
#define DEFAULT_STEREO_POLAR 0 #define DEFAULT_STEREO_POLAR 0
#define DEFAULT_CLIPPER_THRESHOLD 2.0f #define DEFAULT_CLIPPER_THRESHOLD 1.0f
#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
@@ -28,7 +28,7 @@
#define MPX_DEVICE "FM_MPX.monitor" #define MPX_DEVICE "FM_MPX.monitor"
// #define SCA_DEVICE "" // #define SCA_DEVICE ""
#define BUFFER_SIZE 1024 #define BUFFER_SIZE 2048
#include <pulse/simple.h> #include <pulse/simple.h>
#include <pulse/error.h> #include <pulse/error.h>
@@ -61,7 +61,7 @@ static void stop(int signum) {
} }
void show_version() { void show_version() {
printf("fm95 (an FM Processor by radio95) version 1.2\n"); printf("fm95 (an FM Processor by radio95) version 1.3\n");
} }
void show_help(char *name) { void show_help(char *name) {
printf( printf(
@@ -371,9 +371,10 @@ int main(int argc, char **argv) {
init_preemphasis(&preemp_l, preemphasis_tau, SAMPLE_RATE); init_preemphasis(&preemp_l, preemphasis_tau, SAMPLE_RATE);
init_preemphasis(&preemp_r, preemphasis_tau, SAMPLE_RATE); init_preemphasis(&preemp_r, preemphasis_tau, SAMPLE_RATE);
// Use https://www.earlevel.com/main/2021/09/02/biquad-calculator-v3/
BiquadFilter lpf_l, lpf_r; BiquadFilter lpf_l, lpf_r;
init_lpf(&lpf_l, LPF_CUTOFF, 0.707f, SAMPLE_RATE); init_lpf(&lpf_l, LPF_CUTOFF, 0.17675f, SAMPLE_RATE);
init_lpf(&lpf_r, LPF_CUTOFF, 0.707f, SAMPLE_RATE); init_lpf(&lpf_r, LPF_CUTOFF, 0.17675f, SAMPLE_RATE);
// #endregion // #endregion
signal(SIGINT, stop); signal(SIGINT, stop);