this?

lib/filters.c

@@ -14,21 +14,19 @@ float hard_clip(float sample, float threshold) {
 	return fmaxf(-threshold, fminf(threshold, sample));
 }
 
-void init_pll(PLL *pll, float freq, float loop_filter_bandwidth, float damping, int quadrature_mode, int sample_rate) {
+void init_pll(PLL *pll, float freq, float loop_filter_bandwidth, float damping, int sample_rate) {
 	pll->phase = 0.0f;
 	pll->freq = freq;
 	pll->loop_filter_state = 0.0f;
 	pll->kp = M_2PI * loop_filter_bandwidth;
 	pll->ki = (4.0f*damping*damping) * pll->kp * pll->kp;
 	pll->sample_rate = sample_rate;
-	pll->quadrature_mode = quadrature_mode;
 }
 
 float apply_pll(PLL *pll, float ref_sample) {
 	float phase_error;
 
 	float vco_output = sinf(pll->phase);
-	if (pll->quadrature_mode) vco_output = sinf(pll->phase + (M_PI / 2.0f));
 
 	phase_error = atan2f(ref_sample, vco_output);;
 

lib/filters.h

@@ -23,7 +23,6 @@ typedef struct {
 	float kp;
 	float ki;
 	int sample_rate;
-	int quadrature_mode;
 } PLL;
-void init_pll(PLL *pll, float freq, float loop_filter_bandwidth, float damping, int quadrature_mode, int sample_rate);
+void init_pll(PLL *pll, float freq, float loop_filter_bandwidth, float damping, int sample_rate);
 float apply_pll(PLL *pll, float ref_sample);

src/fm95.c

@@ -416,7 +416,7 @@ int main(int argc, char **argv) {
 	init_preemphasis(&preemp_r, preemphasis_tau, sample_rate);
 
 	PLL rds2_pll;
-	init_pll(&rds2_pll, 66500, 1, 2, 1, sample_rate);
+	init_pll(&rds2_pll, 66500, 1, 0.25f, sample_rate);
 	// #endregion
 
 	signal(SIGINT, stop);
@@ -492,7 +492,7 @@ int main(int argc, char **argv) {
 				}
 			}
 			if(rds_on && polar_stereo == 0) {
-				float rds_carrier = get_oscillator_cos_multiplier_ni(&osc, 3);
+				float rds_carrier = get_oscillator_sin_multiplier_ni(&osc, 3);
 				output[i] += (current_rds_in*rds_carrier)*RDS_VOLUME;
 				if(!sca_on) {
 					float rds2_carrier_66 = apply_pll(&rds2_pll, get_oscillator_sin_multiplier_ni(&osc, 1));