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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!inuxc!pur-ee!uiucdcs!trsvax!mikey
From: mikey@trsvax.UUCP
Newsgroups: net.audio
Subject: Re: Re: CD Reflections - 44.1k?
Message-ID: <55100071@trsvax.UUCP>
Date: Wed, 23-Jan-85 10:52:00 EST
Article-I.D.: trsvax.55100071
Posted: Wed Jan 23 10:52:00 1985
Date-Received: Sat, 26-Jan-85 06:22:42 EST
References: <755@clyde.UUCP>
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Nf-ID: #R:clyde:-75500:trsvax:55100071:000:612
Nf-From: trsvax!mikey    Jan 23 09:52:00 1985



Does the theory say "bits/sec" or does it say "data/sec"  The higher
speed modems, for example a 1200 baud, send dibits.  Each data is 
decoded into 2 bits, that is 4 possible values.  That's why a 1200 baud
modem can work full duplex over a phone line and be roughly the same
bandwidth as a 300 baud modem.  Any phase discrepencies become critical
as these modems use the phase angle for detection of which of the 4
quadrants the signal is in.  I haven't looked close at the higher speed
modems, but I believe they use phase angle and amplitude to divide
each datum into more and more bits.

mikey at trsvax