Article View: comp.dsp
Article #1866New version of ADPCM coder available - bug fix
From: Jack Jansen
Date: Thu, 17 Dec 1992 13:29
Date: Thu, 17 Dec 1992 13:29
18 lines
1443 bytes
1443 bytes
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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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!sdd.hp.com!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!ira.uka.de!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!sun4nl!cwi.nl!jack From: jack@cwi.nl (Jack Jansen) Newsgroups: comp.dsp,comp.multimedia,alt.binaries.sounds.d Subject: New version of ADPCM coder available - bug fix Message-ID: <8389@charon.cwi.nl> Date: 17 Dec 92 13:29:25 GMT Sender: news@cwi.nl Followup-To: comp.dsp Organization: CWI, Amsterdam Lines: 18