Newsgroups: comp.speech
Path: pavo.csi.cam.ac.uk!doc.ic.ac.uk!uknet!pipex!uunet!cs.utexas.edu!utnut!torn!watserv2.uwaterloo.ca!watserv1!anderson
From: anderson@crypto2.uwaterloo.ca (Bill Anderson)
Subject: Dirty Sox
Message-ID: <CGB4A6.CIn@watserv1.uwaterloo.ca>
Sender: news@watserv1.uwaterloo.ca
Organization: University of Waterloo
Date: Thu, 11 Nov 1993 02:58:53 GMT
Lines: 17

I have been using sox to convert 16-bit 16kHz TIMIT
speech files to 8-bit 8kHz ulaw PCM.  The problem is
that sox seems to be doing a very dirty job of either
the filtering or the rate conversion.  The PMF
(probability mass function) for a fair sample of data
reveals significant discontinuities at intervals of
16 output levels.  This is very much unexpected and 
very likely in error since the PMF of the original 
TIMIT data is quite smooth.

Can anyone tell me how to fix this problem or point
me in the direction of a better conversion routine?

Many thanks,

Bill Anderson

