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Article #35918Strategies for Playing Digitized Sound
From: David M. Baggett
Date: Thu, 12 Jan 1989 16:33
Date: Thu, 12 Jan 1989 16:33
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1335 bytes
Has anyone experimented with this? (We've all heard Starglider...) Looking in ST Internals, I found that the PSG sound chip has an 8 bit D/A converter. Unfortunately, it doesn't look like you can change the value directly; you have to go through the waveform synthesis stuff (or the frequency/volume registers). 8 bits of resolution produces decent (listenable) quality sound; does anyone know how/if it is possible to change the 8 bit digital value directly? The only alternative I can see is using the noise generator and the volume control, but this only gives four bits of resolution (awful). The Stargilder intro sounds to be about 6 bit resolution -- anyone know how this was done? Maintaining timing for the samples is straightforward with Xbtimer, so that isn't a problem. 44KHz is "correct"; 22KHz should be ok... Answers, anyone? Thanks, Dave Baggett arpa: dmb@TIS.COM If there is interest I will post replies/source code to the net.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!ames!pasteur!ucbvax!TIS.COM!dmb From: dmb@TIS.COM (David M. Baggett) Newsgroups: comp.sys.atari.st Subject: Strategies for Playing Digitized Sound Message-ID: <8901121633.AA12910@TIS.COM> Date: 12 Jan 89 16:33:48 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 20