Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!nrl-cmf!ames!zodiac!meridian!pkahn
From: pkahn@meridian.ads.com (Phil Kahn)
Newsgroups: comp.sys.mac
Subject: Re: Sampling digitised sound via serial ports
Keywords: Sampling
Message-ID: <3866@zodiac.UUCP>
Date: 12 May 88 18:11:50 GMT
References: <2108@munnari.oz>
Sender: news@zodiac.UUCP
Reply-To: pkahn@meridian.UUCP (Phil Kahn)
Organization: Advanced Decision Systems, Mt. View, CA (415) 941-3912
Lines: 29

In article <2108@munnari.oz> castan@munnari.oz (Jason Castan) writes:
>I'm currently in the process of writing a SND and FSSD sound 
>utility package. An important feature would be the ability to
>sample at 22k via one of the serial ports. Does anybody have
>and ideas (and possibly source) on how this might be done?
>
>The 22k rate is faster than the max baud rate allowable, so I
>imagine that you have to go deeper.
>
>Any suggestions, or availability of source code would be greatly
>appreciated.
>		
>				Jason.


To sample at 22Khz, you'll have to directly program the Zilog SCC
chip. You can get an SCC manual by contacting Zilog directly (they're
in the Sunnyvale/Cupertino, California area). Also take a look at the
IM V3.  It is a delicate job which will require chip programming,
assembly coding, and a good understanding of asynchronous
communications in the Mac architecture...

If you intend to write this for the Macrecorder, my understanding is
that this code is publicly forthcoming.

Please keep this net (and me) up to date on the progress of this...
Many of us are eagerly awaiting such a utility...

pk