digitized sound on st

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Article #31250

#31250

From: Bill Rosenkranz
Date: Sun, 13 Mar 1988 10:04

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could anyone out there tell me how to playback digitized sound samples on 
the ST?

i have tried taking say 8-bit linear digitized audio samples (00 - ff
amplitudes) and piping them to the sound chip directly to the 4-bit
d/a level register on the chip (using a table lookup to get as close to
the 4-bit companded output of the chip as possible) but the results are
very noisy and always sound like hisses (even plain sine waves). i know
programs like STSPEAK.TOS and the various playback programs on bbs's
can get reasonably decent sound. are they using some undocumented features
i don't know about? atari was no help (jfeagans and some h/w guys did not
know how to do it...).

please reply via email or by voice at 617/486-1408.
your input is greatly appreciated....

-bill

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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!husc6!linus!alliant!rosenkra
From: rosenkra@Alliant.COM (Bill Rosenkranz)
Newsgroups: comp.sys.atari.st
Subject: digitized sound on st
Message-ID: <1411@alliant.Alliant.COM>
Date: 13 Mar 88 10:04:18 GMT
Reply-To: rosenkra@alliant.UUCP (Bill Rosenkranz)
Distribution: na
Organization: Alliant Computer Systems, Littleton, MA
Lines: 19
Keywords: sound chip playback samples