From: drowe67 <drowe67@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Fri, 11 May 2012 00:40:31 +0000 (+0000)
Subject: addd note on modem sound cards to README_fdmdv
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=f886db092f396ab4335745048fd6be579091635d;p=freetel-svn-tracking.git

addd note on modem sound cards to README_fdmdv

git-svn-id: https://svn.code.sf.net/p/freetel/code@413 01035d8c-6547-0410-b346-abe4f91aad63
---

diff --git a/codec2-dev/README_fdmdv.txt b/codec2-dev/README_fdmdv.txt
index 8f121d5a..e67ce80d 100644
--- a/codec2-dev/README_fdmdv.txt
+++ b/codec2-dev/README_fdmdv.txt
@@ -47,6 +47,15 @@ $ cd src
     $ octave
     octave:1> fdmdv_ut
 
+5. NOTE: If you would like to play modem samples over the air please
+   convert the 8 kHz samples to 48 kHz.  Many PC sound cards have
+   wildly inaccurate sample clock rates when set to 8 kHz, but seem to
+   perform OK when set for 48 kHz.  If playing and recording files you
+   can use the sox utility:
+
+   $ sox -r 8000 -s -2 modem_sample_8kHz.raw -r 48000 modem_sample_48kHz.wav
+
+
 References
 ----------