Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!usc!cs.utexas.edu!uunet!mcvax!ukc!axion!galadriel!pcf
From: pcf@galadriel.bt.co.uk (Pete French)
Newsgroups: sci.electronics
Subject: Re: RS-232 for voice
Message-ID: <302@galadriel.bt.co.uk>
Date: 2 Aug 89 07:50:19 GMT
References: <8840@attctc.Dallas.TX.US>
Organization: RT6115, BTRL, Martlesham Heath, England
Lines: 17

From article <8840@attctc.Dallas.TX.US>, by sampson@attctc.Dallas.TX.US (Steve Sampson):
> 
> You can forget all about the amplitude!  Just pass the sign bit and it sounds
> great.  (Pulse Width Modulation).  ...

UGH! I wouldnt say it sounds 'great'. You are performing the equivalent of
clipping the signal by turning up our amp to infinite volume.

It is, however, just aacceptable and so could be used. I remember constructing
a system to send audio digitally on a test bench and then unplugging the bits
one-by-one to see what the decrease in quality was. We were playing a Suzzanne
Vega tape through it and it was still recognisable, even listenable, at one bit.

I would hesitate to say that this is "Pulse width modulation" though - that is
something rather different.

-Pete French.