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From: robf@mcs213f.cs.umr.edu (Rob Fugina)
Newsgroups: sci.electronics,sci.physics
Subject: Re: A question about the Nyquist theorm
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Date: 18 Feb 91 21:29:39 GMT
References: <D04gX2w163w@shark.cs.fau.edu> <1758@manta.NOSC.MIL> <1759@manta.NOSC.MIL>
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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.

Rob  robf@cs.umr.edu