diff --git a/dsp/bs412.c b/dsp/bs412.c
index 428a281..6369cc4 100644
--- a/dsp/bs412.c
+++ b/dsp/bs412.c
@@ -1,12 +1,12 @@
 #include "bs412.h"
 
 inline float dbr_to_deviation(float dbr) {
-	return 19000.0f * powf(10.0f, dbr / 10.0f);
+	return 19000.0f * powf(2.0f, dbr * 0.332193f);
 }
 
 inline float deviation_to_dbr(float deviation) {
 	if(deviation == 0.0f) return -100.0f;
-	return 10 * log10f(deviation / 19000.0f);
+	return 10.0f * (log2f(deviation) - log2f(19000.0f)) * 0.30103f;
 }
 
 void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {