jj@alice.UUCP (01/22/85)
>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. -- TEDDY BEARS PROTECT PENGUINS FROM WALRUSES "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