Article View: sci.electronics
Article #10308Re: A question about the Nyquist theorm
From: Geoff Steckel - Sun BOS Hardware...
Date: Wed, 20 Feb 1991 23:56
Date: Wed, 20 Feb 1991 23:56
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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. I pose the following question. Suppose you are sampling at rate N samples per second, and you see a constant value V for your A/D sample. Is the frequency of the signal which produced those samples 0 or N/2? Since AARRGGGHHH! The Nyquist criterion requires that sampling be GREATER THAN the highest frequency of interest. Note also that the amplitude response near Fs/2 rolls off towards 0 (sin X / X response). geoff steckel (gwes@wjh12.harvard.EDU) (...!husc6!wjh12!omnivore!gws) Disclaimer: I am not affiliated with Sun Microsystems, despite the From: line. This posting is entirely the author's responsibility.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!newstop!eastapps!vergil!gsteckel From: gsteckel@vergil.East.Sun.COM (Geoff Steckel - Sun BOS Hardware CONTRACTOR) Newsgroups: sci.electronics,sci.physics Subject: Re: A question about the Nyquist theorm Message-ID: <4402@eastapps.East.Sun.COM> Date: 20 Feb 91 23:56:43 GMT References: <6607@healey> <883@idacrd.UUCP> Sender: news@East.Sun.COM Reply-To: gsteckel@east.sun.com (Geoff Steckel - Sun BOS Hardware CONTRACTOR) Followup-To: sci.electronics Distribution: na Organization: Omnivore Technology, Newton, Mass. (617)969-3448 Lines: 17