Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!REEKES@applelink.apple.com
From: REEKES@applelink.apple.com (Jim Reekes)
Newsgroups: comp.sys.mac.programmer
Subject: Re: MacRecorder hacking...
Message-ID: <13296@goofy.Apple.COM>
Date: 2 May 91 19:55:06 GMT
References: <9297@lkbreth.foretune.co.jp> <1991May1.033605.12078@athena.cs.uga.edu>
Sender: usenet@Apple.COM
Distribution: comp
Organization: Apple Computer, Inc.
Lines: 26

In article <1991May1.033605.12078@athena.cs.uga.edu>, kinsey@athena.cs.uga.edu (Kevin Kinsey) writes:
> 
> In article <9297@lkbreth.foretune.co.jp> trebor@lkbreth.foretune.co.jp (Robert J Woodhead) writes:
> >I'm working on a part-time project that, amoungst other things, needs a Mac
> >to be able to determine when sounds start and stop.  What I'd like to do is
> >use my MacRecorder.
> >
> >What I am looking for is software that I can hook into my MPW program that
> >let me:
> >
> >	Initialize the Macrecorder
> >	Get a sample of the current input (eg: the next "byte")
> >	Clean up afterwards
> >
> >My current theory is that by just reading in samples and averaging the last
> >N or so, I can get a pretty good "level" meter that will be able to determine
> >the start/stop of sound bursts to within .01 second or so.
> >
> >Anyone know where I can get such software?  Thanks.


The MacRecorder driver for the new Sound Manager supports level metering.
The Apple built-in driver supports VOX (voice activated levels to trigger
start and stop of recording) but the MacRecorder currently doesn't.

Jim Reekes E.O., Macintosh Toolbox Engineering