start modularization

filter/bs412.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#ifdef DEBUG
+#define BS412_DEBUG
+#endif
+
+#include <math.h>
+#ifdef BS412_DEBUG
+#include "../lib/debug.h"
+#endif
+
+typedef struct
+{
+	int sample_counter;
+	int sample_rate;
+	double sample;
+} MPXPowerMeasurement;
+
+float dbr_to_deviation(float dbr);
+float deviation_to_dbr(float deviation);
+
+void init_modulation_power_measure(MPXPowerMeasurement *mpx, int sample_rate);
+float measure_mpx(MPXPowerMeasurement *mpx, float deviation);