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From: mat@hou4b.UUCP (Mark Terribile)
Newsgroups: net.audio
Subject: Re: CD Musings
Message-ID: <1282@hou4b.UUCP>
Date: Thu, 17-Jan-85 12:43:41 EST
Article-I.D.: hou4b.1282
Posted: Thu Jan 17 12:43:41 1985
Date-Received: Fri, 18-Jan-85 02:48:33 EST
References: <257@petrus.UUCP>
Organization: AT&T Information Systems Laboratories, Holmdel, NJ
Lines: 28

>> .....Although the medical texts state that Homo Sapiens
>> can hear frequencies between 20 Hz and 20 kHz, these figures refer to the
>> Fundamental frequencies.

>What difference does that make? The upper limit of a person's hearing
>has nothing to do with whether the high frequency signal is associated
>with a lower frequency one. If anything, it'd be harder to detect the
>presence or absence of a very high frequency component along with a
>lower frequency fundamental because the latter would be much stronger.

The second part first:  the fact that timbres are distinct indicate that
small amounts of upper harmonic energy over the base frequency (pitch) ARE
significant.  And the human ear is NOT a linear device.  It is an active
nonlinear detector whose output is subject to the most comprehensive analysis
known to man.

I recall reading of evidence that indicated that upper harmonic energy
at 28 kHz or greater could be detected over a base tone by many people.  It
was not heard as a pitch but rather as a change in timbre.

There is something to be said for the ``DC-to-daylight'' amp.  On the other
hand, it seems to me that at these ridiculous frequencies vinyl may not
do all that well either, so the CD loss may not be as great as supposed.
-- 

	from Mole End			Mark Terribile
		(scrape .. dig )	hou4b!mat
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