u-Law/A-Law to ADPCM?

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Article #16084

#16084

From: Brian Kantor
Date: Sun, 30 Jun 1991 02:40

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I'm about to embark on a project in digitized speech for telemetry, and
it would be most convenient for me to be able to record and edit the
speech on a sun Sparcstation.

The Sun has an AM79C30 ISDN chip in it, which samples the audio at 8kHz
and produces 8-bit samples using u-law or A-law compression.

The device that will reproduce the sound is one of those nifty OKI
speech chips that also uses samples at 8 kHz, but wants to see 4-bit
ADPCM data in the ROM.

To save me some work, does anyone have a program or handy algorithm to
convert the sparc audio samples to 4-bit ADPCM?
	- Brian

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!ucsd!brian
From: brian@ucsd.Edu (Brian Kantor)
Newsgroups: sci.electronics
Subject: u-Law/A-Law to ADPCM?
Message-ID: <36646@ucsd.Edu>
Date: 30 Jun 91 02:40:14 GMT
Organization: The Avant-Garde of the Now, Ltd.
Lines: 14