commit b4b75b47c2a4248e60bbc3229d6acc4d5f872431
author Mathias Agopian <mathias@google.com> Mon Oct 29 17:13:20 2012 -0700
committer Mathias Agopian <mathias@google.com> Mon Oct 29 17:13:20 2012 -0700
tree 55de9b4294936b7453e36b5afa24b59770ae1a37
parent 9aec8c3f7f72cd36a8e3d7aafc1149f50514087a

fir a typo that caused up-sampling coefficiens to be wrong

up-sample coefficient were generated with a cut-off frequency of 24KHz
intead of ~20KHz, which caused more aliasing in the audible band.

also increased the attenuation to 1.3 dB on both up and down
sampling coefficient to avoid clipping.

Change-Id: Ie8aeecf1429190541b656810c6716b6aae5ece2e

tools/resampler_tools/fir.cpp

diff --git a/tools/resampler_tools/fir.cpp b/tools/resampler_tools/fir.cpp
index 14707d1..acd9911 100644
--- a/tools/resampler_tools/fir.cpp
+++ b/tools/resampler_tools/fir.cpp
@@ -84,7 +84,7 @@
     unsigned int polyN = 147;
     bool debug = false;
     double Fs = 48000;
-    double Fc = 24000;
+    double Fc = 20478;
     double atten = 1;
     int format = 0;