Article View: sci.electronics
Article #10404Re: A question about the Nyquist theorm
From: Tom Gray
Date: Mon, 25 Feb 1991 14:49
Date: Mon, 25 Feb 1991 14:49
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1564 bytes
In article <GREENBA.91Feb21095446@gambia.crd.ge.com> greenba@gambia.crd.ge.com (ben a green) writes:
:In article <4402@eastapps.East.Sun.COM> gsteckel@vergil.East.Sun.COM (Geoff Steckel - Sun BOS Hardware CONTRACTOR) writes:
:
: In article <883@idacrd.UUCP> mac@idacrd.UUCP (Robert McGwier) writes:
: From article <6607@healey>, by grayt@Software.Mitel.COM (Tom Gray):
: > The shape of the wave is preserved within the sampling pulse. This
: > information allows representation of a signal at exactly 1/2
: > the Nyquist freqency.
:
:Furthermore, the claim that "the shape of the wave is preserved within the
:smpling pulse" would imply that an analytic signal could be reproduced
:entirely from ONE sample, since all the derivatives of the signal are
:available in the sample. Can't believe Nyquist said that.
:--
The claim is that in natural sampling, the wave shape DURING the
sample period is preserved. For example, sampling could take place
with an analog gate.
The sampling technique is
sample = signal during sampling period
= 0 ohterwise
No claim of anyother properties were made.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!cunews!software.mitel.com!grayt From: grayt@Software.Mitel.COM (Tom Gray) Newsgroups: sci.electronics Subject: Re: A question about the Nyquist theorm Message-ID: <6679@enzo> Date: 25 Feb 91 14:49:02 GMT References: <883@idacrd.UUCP> <4402@eastapps.East.Sun.COM> <GREENBA.91Feb21095446@gambia.crd.ge.com> Distribution: na Organization: Mitel. Kanata (Ontario). Canada. Lines: 28