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Path: utzoo!watmath!watdcsu!herbie
From: herbie@watdcsu.UUCP (Herb Chong [DCS])
Newsgroups: net.audio
Subject: Re: Re: CD Reflections - 44.1k?
Message-ID: <874@watdcsu.UUCP>
Date: Fri, 25-Jan-85 23:24:54 EST
Article-I.D.: watdcsu.874
Posted: Fri Jan 25 23:24:54 1985
Date-Received: Sat, 26-Jan-85 06:33:48 EST
References: <755@clyde.UUCP> <55100071@trsvax.UUCP>
Reply-To: herbie@watdcsu.UUCP (Herb Chong [DCS])
Organization: U of Waterloo, Ontario
Lines: 34
Summary: 

In article <55100071@trsvax.UUCP> mikey@trsvax.UUCP writes:
>
>
>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

The theory says bits because that is the smallest possible unit of information.
A good book on information theory for the types who don't deal with it
every day is

Pierce, John R., An Introduction to Information Theory,
Dover Publications, Inc., New York, 1980.

It's a relatively nonmathematical treatment of the subject based more on
intuitive arguments than lots of equations.  It won't help you design
communications channels much, but the theory is all there.

Herb Chong...

I'm user-friendly -- I don't byte, I nybble....

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