New version of ADPCM coder available - bug fix - Thread - go-pugleaf

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1 total messages Started by Jack Jansen Thu, 17 Dec 1992 13:29

New version of ADPCM coder available - bug fix

#1866

Author: Jack Jansen
Date: Thu, 17 Dec 1992 13:29

18 lines
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I suggest that everyone who uses my Intel/DVI compatible ADPCM coder
routines grab a new version off ftp.cwi.nl:/pub/adpcm.shar.

This version (V1.1) fixes a bug in the predicted-value update. Besides
being incompatible with other Intel/DVI coders (if any exist:-) this
caused a pretty serious loss of quality. The buggy version had 4-8%
distortion on average where the fixed version has only 1-2%
(comparable if not lower than uLAW/ALAW coders).

In case you don't have a clue what I'm talking about: adpcm.shar is a
set of two routines to convert 16 bit linear audio samples to 4 bit
Adaptive Delta Pulse Code Modulation samples and back, resulting in a
4-fold compression at only a moderate loss of quality.
-- 
--
Jack Jansen        | If I can't dance I don't want to be part of
Jack.Jansen@cwi.nl | your revolution             -- Emma Goldman
uunet!cwi.nl!jack    G=Jack;S=Jansen;O=cwi;PRMD=surf;ADMD=400net;C=nl

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