From: Frank Mutter <frank@fradcode.de>
Date: Fri, 13 Jul 2018 17:25:38 +0000 (+0200)
Subject: changed sign
X-Git-Url: https://git.harvie.cz/?a=commitdiff_plain;h=227018faa7ccf441dfa41a1f39f17299fc132321;p=mirrors%2FPrograms.git

changed sign
---

diff --git a/c/goertzel/goertzel.c b/c/goertzel/goertzel.c
index 19bfdf5..d13a874 100644
--- a/c/goertzel/goertzel.c
+++ b/c/goertzel/goertzel.c
@@ -29,7 +29,7 @@ float goertzel_mag(int numSamples,float TARGET_FREQUENCY,int SAMPLING_RATE, floa
 
     // calculate the real and imaginary results
     // scaling appropriately
-    real = (q2 - q1 * cosine) / scalingFactor;
+    real = (q1 * cosine - q2) / scalingFactor;
     imag = (q1 * sine) / scalingFactor;
 
     magnitude = sqrtf(real*real + imag*imag);