Re: MU-law and A-law tables in the DSP56000

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Article #1889

#1889

From: Paul Bame
Date: Tue, 22 Dec 1992 00:21

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In comp.dsp, bartjan@blade.stack.urc.tue.nl (Bartjan Wattel) writes:

> I'm starting on studying the DSP56000 for an exam at the Eindhoven University
> of Technology (the Netherlands). I ran into the terms 'MU-law' and 'A-law'.

> Could anybody tell me in what way these tables can be used ? I have the idea
> that the tables have something to do with (data)compression, but I might be
> wrong...

These are defined in section G.711 in the CCITT "Blue Book" (I think I've
got that right).  Mu-law effectively allows 14 bits of dynamic range
to be stuffed into 8 bits and is rather like a signed logarithm - but it's
not really a logarithm which is why conversion tables are used.  A-law
is a variant of mu-law with which I'm unfamiliar which is also defined in
G.711.  If you have an HP workstation with audio I/O hardware, chances are
good it understands mu-law, a-law, and linear encoding (which hasn't
made it into the FAQ yet).

	-Paul Bame

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From: bame@hpfcbig.SDE.HP.COM (Paul Bame)
Date: Tue, 22 Dec 1992 00:21:43 GMT
Subject: Re: MU-law and A-law tables in the DSP56000
Message-ID: <6380001@hpfcbig.SDE.HP.COM>
Organization: HP SESD, Fort Collins, CO
Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!hpfcbig!bame
Newsgroups: comp.dsp
References: <6682@tuegate.tue.nl>
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