not sure

dsp/bs412.c

@@ -0,0 +1,30 @@
+#include "bs412.h"
+
+float dbr_to_deviation(float dbr) {
+	return 19000.0f * powf(10.0f, dbr / 10.0f);
+}
+
+float deviation_to_dbr(float deviation) {
+	return 10 * log10f((deviation + 1e-6f) / 19000.0f);
+}
+
+void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {
+	mpx->i = 1;
+	mpx->sample = 0;
+	mpx->sample_rate = sample_rate;
+}
+
+float measure_mpx(MPXPowerMeasurement* mpx, float deviation) {
+	mpx->sample += deviation * deviation; // rmS
+	mpx->i++;
+
+	float avg_deviation = sqrtf(mpx->sample / mpx->i); // RMs
+	float modulation_power = deviation_to_dbr(avg_deviation);
+
+	if (mpx->i >= mpx->sample_rate * 60) {
+		mpx->sample = 0;
+		mpx->i = 0;
+	}
+
+	return modulation_power;
+}