Re: D/A Sound Question

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#871

From: George Robbins
Date: Sat, 12 Aug 1989 21:59

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In article <630@umigw.MIAMI.EDU> dnelson@ibiza.cs.miami.edu (Dru Nelson) writes:
> 
>  Simply, what method does the Paula chip use to compine sound channels
>  0 and 1?  Does it just add and divide by 2 to average the two channels?  

It is done pretty much analog style, by tieing the outputs of two D/A
sections to the same pin.

>  Also, how did they fit those D/A converters into one chip?  Most D/A 
>  converter chips are quite large, and yes, the Paula is quite big too.
>  Still, do the leave some of the process to be finished by some external
>  circuitry?

Limiting the resolution to 8-bits makes things relatively easy.  Each added
bit doubles you problems...  The only external processing is a current->
voltage conversion and filtering.

-- 
George Robbins - now working for,	uucp: {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!csd4.milw.wisc.edu!lll-winken!ames!oliveb!amiga!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga.tech
Subject: Re: D/A Sound Question
Keywords: D/A SOUND
Message-ID: <7645@cbmvax.UUCP>
Date: 12 Aug 89 21:59:31 GMT
References: <630@umigw.MIAMI.EDU>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 21

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