Path: 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> Distribution: na Organization: Mitel. Kanata (Ontario). Canada. Lines: 28 In article 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. Brought to you by Super Global Mega Corp .com