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Article #10250Re: A question about the Nyquist theorm
From: john f andrews ece
Date: Tue, 19 Feb 1991 15:25
Date: Tue, 19 Feb 1991 15:25
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an added practical note: after you get through all of the theory,
sample at about 2.5 or more times the Nyquist frequency to get everything
in your signal (you will have noise and such at up to there or so).
Of course better is to seriously prefilter your analog signal to well
below the Nyquist. This will ensure that all the nasties above your
*theoretical* Nyquist will be more than 78dB or so down and thus less than
1/2 LSB of you AD converter (assuming you are using one). Then the noise will
be below the input threshold of the ADC.
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john f andrews SYSOP The Biomedical Engineering BBS
24 hrs 300/1200/2400 (201) 596-5679
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rutgers!njin!njitgw!hertz.njit.edu!jfa0522 From: jfa0522@hertz.njit.edu (john f andrews ece) Newsgroups: sci.electronics,sci.physics Subject: Re: A question about the Nyquist theorm Message-ID: <2371@njitgw.njit.edu> Date: 19 Feb 91 15:25:43 GMT References: <91046.095459F0O@psuvm.psu.edu> Sender: news@njitgw.njit.edu Organization: New Jersey Institute of Technology, Newark, N.J. Lines: 17