From b4b75b47c2a4248e60bbc3229d6acc4d5f872431 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Mon, 29 Oct 2012 17:13:20 -0700
Subject: 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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'tools')

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 @@ int main(int argc, char** argv)
     unsigned int polyN = 147;
     bool debug = false;
     double Fs = 48000;
-    double Fc = 24000;
+    double Fc = 20478;
     double atten = 1;
     int format = 0;
 
-- 
cgit v1.1