Merge pull request #20 from bw3/master

Fix gain calculation for EQ 2nd order low pass filters.
MCUdude · Aug 2, 2021 · edfac6c · edfac6c
2 parents 3b2f61d + 124ad21
commit edfac6c
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/SigmaDSP.cpp b/src/SigmaDSP.cpp
@@ -531,7 +531,7 @@ void SigmaDSP::EQsecondOrder(uint16_t startMemoryAddress, secondOrderEQ_t &equal
       a1 = -2*cos(w0);
       a2 = 1 - alpha;
       b0 = (1 - cos(w0)) * (gainLinear/2);
-      b1 = 1 - cos(w0)  * gainLinear;
+      b1 = (1 - cos(w0))  * gainLinear;
       b2 = (1 - cos(w0)) * (gainLinear/2);
       break;
 
@@ -575,7 +575,7 @@ void SigmaDSP::EQsecondOrder(uint16_t startMemoryAddress, secondOrderEQ_t &equal
       a1 = -2*cos(w0);
       a2 = 1 - alpha;
       b0 = (1 - cos(w0)) * gainLinear / 2;
-      b1 = 1 - cos(w0) * gainLinear;
+      b1 = (1 - cos(w0)) * gainLinear;
       b2 = (1 - cos(w0)) * gainLinear / 2;
       break;
 
@@ -597,7 +597,7 @@ void SigmaDSP::EQsecondOrder(uint16_t startMemoryAddress, secondOrderEQ_t &equal
       a1 = -2*cos(w0);
       a2 = 1 - alpha;
       b0 = (1 - cos(w0)) * gainLinear / 2;
-      b1 = 1 - cos(w0) * gainLinear;
+      b1 = (1 - cos(w0)) * gainLinear;
       b2 = (1 - cos(w0)) * gainLinear / 2;
       break;