diff --git a/lib/bs412.c b/lib/bs412.c
index b4da6dd..dd029b6 100644
--- a/lib/bs412.c
+++ b/lib/bs412.c
@@ -1,11 +1,11 @@
 #include "bs412.h"
 
 float dbr_to_deviation(float dbr) {
-	return (19000.0f * 0.70710678f) * powf(10.0f, dbr / 20.0f);
+	return 19000.0f * powf(10.0f, dbr / 20.0f);
 }
 
 float deviation_to_dbr(float deviation) {
-	return 20 * log10f((deviation + 1e-6f) / (19000.0f * 0.70710678f));
+	return 20 * log10f((deviation + 1e-6f) / 19000.0f);
 }
 
 void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {
@@ -15,7 +15,7 @@ void init_modulation_power_measure(MPXPowerMeasurement* mpx, int sample_rate) {
 }
 
 float measure_mpx(MPXPowerMeasurement* mpx, float deviation) {
-    mpx->sample += deviation * deviation;
+    mpx->sample += deviation * deviation; // rmS
     mpx->i++;
 
     float avg_deviation = sqrtf(mpx->sample / mpx->i);