radio95/fm95
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will liquid dsp work?

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KubaPro010
2025-05-01 10:32:34 +02:00
parent 5ec1893238
commit f1e6350fec
1 changed files with 11 additions and 0 deletions
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11
src/fm95.c
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@@ -2,6 +2,9 @@
#include <stdlib.h>
#include <stdint.h>
#include <getopt.h>
#include <liquid/liquid.h>
#define LPF_ORDER 9
#define buffer_maxlength 12288
#define buffer_tlength_fragsize 12288
@@ -357,6 +360,10 @@ int main(int argc, char **argv) {
FMModulator sca_mod;
init_fm_modulator(&sca_mod, sca_frequency, sca_deviation, sample_rate);
iirfilt_crcf lpf_l, lpf_r;
lpf_l = iirfilt_crcf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 0.0f, 0.01f);
lpf_r = iirfilt_crcf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 0.0f, 0.01f);
ResistorCapacitor preemp_l, preemp_r;
init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);
init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
@@ -431,6 +438,8 @@ int main(int argc, char **argv) {
float ready_l = apply_preemphasis(&preemp_l, l_in);
float ready_r = apply_preemphasis(&preemp_r, r_in);
iirfilt_crcf_execute(lpf_l, (complex float)ready_l + 0.0f*I, &ready_l);
iirfilt_crcf_execute(lpf_l, (complex float)ready_r + 0.0f*I, &ready_r);
ready_l = process_agc_stereo(&agc, ready_l, ready_r, &ready_r);
ready_l = hard_clip(ready_l*audio_volume, clipper_threshold);
ready_r = hard_clip(ready_r*audio_volume, clipper_threshold);
@@ -484,6 +493,8 @@ int main(int argc, char **argv) {
}
}
printf("Cleaning up...\n");
iirfilt_crcf_destroy(lpf_l);
iirfilt_crcf_destroy(lpf_r);
free_PulseInputDevice(&input_device);
if(mpx_on) free_PulseInputDevice(&mpx_device);
if(rds_on) free_PulseInputDevice(&rds_device);