Information Wanted on CCITT 32-kb/s ADPCM Algorithm

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Article #893

#893

From: Tom Scott
Date: Wed, 01 Aug 1990 19:22

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I'm interested in an algorithm for converting between PCM (pulse code 
modulation) and ADPCM (adaptive differential pulse code modulation). 
The system I'm using has a commercial chip, that I believe is made by Toshiba,
to digitize and encode voice and I need to know the algorithm so that I can
write software to decode its output for voice analysis.

My guess is that the chip implements CCITT's standards 32-kb/s ADPCM
algorithm but don't know what this algorithm is.  Help is appreciated.

Tom Scott
tscott@westford.ccur.com

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!uakari.primate.wisc.edu!dali.cs.montana.edu!masscomp!westford.ccur.com!tscott
From: tscott@westford.ccur.com (Tom Scott)
Newsgroups: comp.dsp
Subject: Information Wanted on CCITT 32-kb/s ADPCM Algorithm
Message-ID: <36771@masscomp.ccur.com>
Date: 1 Aug 90 19:22:24 GMT
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Reply-To: tscott@westford.ccur.com (Tom Scott)
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Organization: Concurrent Computer Corp. Westford MA.
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