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From: F0O@psuvm.psu.edu
Newsgroups: sci.electronics,sci.physics
Subject: A question about the Nyquist theorm
Message-ID: <91046.095459F0O@psuvm.psu.edu>
Date: 15 Feb 91 14:54:59 GMT
Organization: Penn State University
Lines: 15


     I was reading an article that states the Nyquist theorm as:
     "The sample frequency must be at least twice the highest frequency
component within the analog signal for an accurate representation of the
analog signal".
     I'd guess here he is talking about complex signals.  But what do you
do with a pure sine wave?  There is only one frequency component in a sine
wave(the fundamental), and if you sample at twice that, you're not going
to get a good representation of the signal.
     i.e. If you have a 60HZ sine wave, and you sample at 120HZ, you're
only going to get two points per cycle.
     I'm sure I must not be understanding something here, or does the
Nyquist equation only apply to complex signals?

                                                             [Tim]