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Article #10242Re: A question about the Nyquist theorm
From: Mark H. North
Date: Tue, 19 Feb 1991 03:57
Date: Tue, 19 Feb 1991 03:57
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In article <2189@umriscc.isc.umr.edu> robf@mcs213f.cs.umr.edu (Rob Fugina) writes: >In article <1759@manta.NOSC.MIL> north@manta.NOSC.MIL (Mark H. North) writes: >>Sorry to answer my own post but I take that last paragraph back. I think >>you are wrong after all. Look at it this way -- suppose I tell you I'm >>going to send you one of two signals, either 1 volt 60 Hz or a DC voltage >>between -1 and 1 volt. You may sample at 120 Hz. You get all identical >>samples at 0.5 volts. Which signal did I send? >>Mark > >You sent a DC signal of 0.5 volts. If it were AC, you the samples would >be alternating positive and negative of the same magnitude. > Yes, thanks for pointing that out. How about all zero samples? Yes, I know, pretty damn likely it was the DC signal. I think I made my point, you must sample at >2nu to reconstruct the signal. Mark
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!nosc!manta!north From: north@manta.NOSC.MIL (Mark H. North) Newsgroups: sci.electronics Subject: Re: A question about the Nyquist theorm Message-ID: <1772@manta.NOSC.MIL> Date: 19 Feb 91 03:57:49 GMT References: <1758@manta.NOSC.MIL> <1759@manta.NOSC.MIL> <2189@umriscc.isc.umr.edu> Organization: Naval Ocean Systems Center, San Diego Lines: 17