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Path: utzoo!linus!philabs!seismo!harpo!floyd!vax135!ariel!hou5f!orion!houca!hogpc!houxm!ihnp4!ihuxk!rs55611
From: rs55611@ihuxk.UUCP
Newsgroups: net.audio
Subject: Re: severe beating
Message-ID: <358@ihuxk.UUCP>
Date: Wed, 15-Jun-83 15:54:39 EDT
Article-I.D.: ihuxk.358
Posted: Wed Jun 15 15:54:39 1983
Date-Received: Thu, 16-Jun-83 22:39:07 EDT
References: <470@ihuxr.UUCP>
Organization: BTL Naperville, Il.
Lines: 23

In regard to the comment that CDs don't have the bandwidth for
third and fourth harmonics:

But they do! The highest fundamental on a piano keyboard is 4186 Hz.
(Csub8).  Thus, a CD system with a bandwidth of 20 kHz (>40 kHz.,
but most likely ~50 kHz. sampling rate) will accurately reproduce
the third and fourth harmonics of the highest pitch piano note.
Furthermore, this is higher in frequency than the highest notes
produced by flutes, piccolos, harps, clarinets, soprano saxes,
etc. (fundamentals of these are all lower than the highest C on
a piano). As another comparison, an operatic soprano upper limit
is about 1050 Hz (~Csub4), so that high order harmonics will
all fall below 20 kHz.  I would submit that any discoloration
heard at CES was likely in the amps and/or speakers, or else there
were hardware problems in the system that resulted in lost bits,
and therefore excessive quantization distortion.

(The max. pitch info was pulled from a book on human factors topics, 
including speech and hearing, called Human Information Processing,
by Lindsay and Norman.)

Bob Schleicher
ihuxk!rs55611 Bell Labs, Naperville, Ill.