Path: utzoo!attcan!uunet!husc6!bbn!oberon!nunki.usc.edu!aliu From: aliu@nunki.usc.edu (Alejandro Liu) Newsgroups: comp.sys.cbm Subject: Re: Sound In? Summary: SID built in A/D Keywords: It exists Message-ID: <2212@nunki.usc.edu> Date: 23 Dec 88 07:06:11 GMT References: <992.23AFEC5A@isishq.FIDONET.ORG> Reply-To: acliu@nunki.usc.edu (Alejandro Liu) Organization: University of Southern California, Los Angeles, CA Lines: 42 In article <992.23AFEC5A@isishq.FIDONET.ORG> Geoffrey.Welsh@isishq.FIDONET.ORG (Geoffrey Welsh) writes: > > > From: js9b+@andrew.cmu.edu (Jon C. Slenk) > > Message-ID: > > I saw an advertisement (in sharper image catalog) for a > > unit that takes voice > > input and then gives a smooth, instrumental output. > > It struck me that the SID chip is a full synthesizer. Couldn't > > it be set-up to > > do much the same thing, but with greater variety? > I'm no SID expert, but I'm sure the answer is "no"; at least not >without extra hardware. I am not a SID expert either, but the thing is possible, with some cheap Hardware aditions. That is called digitizing. The problem is that digitizing takes HUGES ammounts of memory. So you have two options, record a shorter sound or loose sound quality. Probably, this device you are talking about, decide to loose sound quality in order to allow longer songs. > The SID chip's input is not affected by the synthesizer aspect of You don't use the SID chip's input that is connected to the Video Port of the C-64 to do that though. > In order to modify an incoming signal, you'd have to be using analytical >hardware (or some basic A/D hardware and analytical software) and then The SID chip, also has two A/D converters built in. Currently, they are used to read the Paddles. I am not an electronics wizard, but it is possible to use them to DIGITIZE a sound input. (I belive that there were a couple of devices that use that scheme to digitize sounds, but I think that the company that built them has gone out of business) Using that by itself, you will be able to achieve some success in digitizing sounds, pretty much like a CD, but with a resolution of 4 bits. The A/D converters, have 8 bit resolution, but I think most of the SID register are 4 bit only. Of course, you can then use a program to analyze the data so it can be played back using a more elborated way, rather than changing volume levels. -- aliu@nunki.usc.edu (Alejandro Liu) (Simple .signature, $CHEAP$)