Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!attctc!sampson
From: sampson@attctc.Dallas.TX.US (Steve Sampson)
Newsgroups: sci.electronics
Subject: Re: RS-232 for voice
Message-ID: <8840@attctc.Dallas.TX.US>
Date: 1 Aug 89 05:02:13 GMT
References: <9185@kean.mun.ca> <3999@cps3xx.UUCP>
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 8


You can forget all about the amplitude!  Just pass the sign bit and it sounds
great.  (Pulse Width Modulation).  There's a program on compuserve that
basically digitizes via a comparator.  The record program then samples one
bit (comparator output) via interrupts and stores the resulting bits on disk.
The playback outputs to the speaker.  The quality is very acceptable.  This
program was also posted on the net, so check your ibm.pc area.  I tried the
circuit at 8 kHz and it was just a little less than telephone quality.