Newsgroups: comp.speech
Path: pavo.csi.cam.ac.uk!doc.ic.ac.uk!uknet!pipex!uunet!walter!qualcom.qualcomm.com!qualcom!rdippold
From: rdippold@qualcomm.com (Ron "Asbestos" Dippold)
Subject: Re: ANNOUNCE: CELP voice compression offered (commercial)
Message-ID: <rdippold.743822423@qualcom>
Originator: rdippold@qualcom.qualcomm.com
Sender: news@qualcomm.com
Nntp-Posting-Host: wizard-gw.qualcomm.com
Organization: Qualcomm, Inc., San Diego, CA
References: <1993Jul27.215619.26812@extropia.wimsey.com> <234ejf$h4f@master.cs.rose-hulman.edu>
Date: Wed, 28 Jul 1993 01:20:23 GMT
Lines: 13

The Qualcomm vocoder is a fully variable vocoder that uses QCELP at
all rates - there's no special silence mode.  However, eighth rate
(1000 bps, 200 bps more if you want correction for iffy transmission
mediums) is of poor enough quality for normal speech that you
certainly don't want to listen to a normal conversation through it -
hence, it's used mostly for encoding silence and other sounds that
don't change much: "Uhhhhhhh," "Hmmmmmmm."  You get the idea.  There's
also an adaptive background noise filter which lets it use eighth rate
even if there's some fairly nasty background noise.


-- 
Guns don't kill people, postal workers kill people.
