Path: 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 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)