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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!jj
From: jj@alice.UUCP
Newsgroups: net.audio
Subject: Quantization and Mr. Nyquest
Message-ID: <3317@alice.UUCP>
Date: Tue, 22-Jan-85 07:27:10 EST
Article-I.D.: alice.3317
Posted: Tue Jan 22 07:27:10 1985
Date-Received: Wed, 23-Jan-85 06:07:11 EST
Organization: New Jersey State Farm for the Terminally Bewildered
Lines: 24


>A small correction if I may.  The nyquist theorem states that sampling at
>frequency 2F allows reconstruction of all information with frequency F or
>less, but only if the samples are infinite precision.  Since finite
>precision (16 bits) is used, the actual fact is that information gets
>fuzzier (and so reconstruction gets worse) as the frequency gets closer to
>the nyquist limit.


Begging your pardon, sir (or ma'am), but the first half of this statement is
correct, i.e. you DO loose something by quantization, and that is
specifically signal to noise ratio.   This loss is FLAT with frequency,
and getting closer to the Nyquest limit doesn't have particular effect
at all as far on quantization.  The quality of the reconstruction is independant
of the nearness to the Nyquest limit, EXCEPT as may be due to anti-aliasing
filters,  which do not interact with the quantizer.


-- 
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"I wish I was home again, back home in my heart again, it's been such a time
since my heart's home to me. ..."

(allegra,harpo,ulysses)!alice!jj