Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!uunet!dialogic!gerry
From: gerry@dialogic.com (Gerry Lachac)
Newsgroups: comp.sys.amiga.audio
Subject: Re: ULAW audio encoding
Message-ID: <1991Mar30.172254.26452@dialogic.com>
Date: 30 Mar 91 17:22:54 GMT
References: <1991Mar27.111945.15160@csis.dit.csiro.au> <1991Mar28.161224.8705@cbnewse.att.com>
Distribution: na
Organization: Dialogic Corporation
Lines: 32

In article <1991Mar28.161224.8705@cbnewse.att.com> cwpjr@cbnewse.att.com (clyde.w.jr.phillips) writes:
>In article <1991Mar27.111945.15160@csis.dit.csiro.au>, dave@csis.dit.csiro.au (David Campbell) writes:

>> All I want to do is convert raw 8-bit ulaw data to raw 8-bit data suitable
>> for the Amiga.  Forget the IFF sound-file business.

Get iff2ulaw.  It should be avalable for ftp from
abcfd20.larc.nasa.gov, I think.  It is a public domain program that
converts uLAW SparcStation sound (raw uLAW) to Amiga IFF, and raw
Amiga sound.  And vice-versa.  It was written for the Sun, but I
converted it to compile under Manx in about 10 minutes.  Depending on
the sampling rate of your sounds, you'll have to change a define in
one of the C files.

>is this what they call an oxymoron? 8bit data suitable for Amiga is IFF.

Not really.  Sound data doesn't *have* to be in IFF format.  That's
just header information fluff with an optional compression algoritm.
All you really need is the raw sound data.

>ISDN doesn't need to use ulaw encoding for 8bit sampling
>(ie AMI & ISDN have the same standard capabilities... )
>so what's this data from?

I don't think you're 100% correct here.  Voice data over a T-1 span
(or ISDN for that matter) comes encoded as uLAW.  This is to cut back
on the amount of voice data transferred.
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