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From: mac@idacrd.UUCP (Robert McGwier)
Newsgroups: sci.electronics,sci.physics
Subject: Re: A question about the Nyquist theorm
Message-ID: <883@idacrd.UUCP>
Date: 20 Feb 91 16:06:39 GMT
References: <6607@healey>
Organization: idacrd, princeton, nj
Lines: 24

From article <6607@healey>, by grayt@Software.Mitel.COM (Tom Gray):
> This is a common misconception. The sampling pulses are of finite widht.
> 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.
> 
> Most text books play fast and lose with Nyquist.



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
I obviously posed this question because I know you CANNOT discriminate
between these two cases, what exactly is it then that Nyquist IS telling
us and am I asking about apples and oranges?

Bob

-- 
____________________________________________________________________________
    My opinions are my own no matter	|	Robert W. McGwier, N4HY
    who I work for! ;-)			|	CCR, AMSAT, etc.
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