From f886db092f396ab4335745048fd6be579091635d Mon Sep 17 00:00:00 2001 From: drowe67 Date: Fri, 11 May 2012 00:40:31 +0000 Subject: [PATCH] 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 --- codec2-dev/README_fdmdv.txt | 9 +++++++++ 1 file changed, 9 insertions(+) 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 ---------- -- 2.25.1