From bd9e684e016b2bd8f1f68830eda357a03918a14a Mon Sep 17 00:00:00 2001 From: KubaPro010 Date: Thu, 1 May 2025 11:11:11 +0200 Subject: [PATCH] try a butterworth --- src/fm95.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/fm95.c b/src/fm95.c index 54645a0..10880cb 100644 --- a/src/fm95.c +++ b/src/fm95.c @@ -361,8 +361,8 @@ int main(int argc, char **argv) { 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, 1.0f, 60.0f); - lpf_r = iirfilt_crcf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 60.0f); + lpf_l = iirfilt_crcf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 1.0f); + lpf_r = iirfilt_crcf_create_prototype(LIQUID_IIRDES_BUTTER, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, LPF_ORDER, (15000.0f/sample_rate), 0.0f, 1.0f, 1.0f); ResistorCapacitor preemp_l, preemp_r; init_preemphasis(&preemp_l, preemphasis_tau, sample_rate);