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From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: A question about the Nyquist theorm
Message-ID: <5170107@hplsla.HP.COM>
Date: 18 Feb 91 07:16:30 GMT
References: <91046.095459F0O@psuvm.psu.edu>
Organization: HP Lake Stevens, WA
Lines: 13

terryb.bbs@shark.cs.fau.edu (terry bohning) writes:
>zimmer@calvin.stanford.edu (Andrew Zimmerman) writes:
>> Just to nit-pick, it should be "GREATER then twice the bandwidth of the 
>> signal", not twice the highest frequency.
>> 
>
>Wow, that's great! So I only need to sample my 10 Hz bandwidth signal
>which is centered at 1 MHz at 20 Hz!

Just so--except that with exactly 20Hz sampling, you cannot get information
on the amplitude of the component at exactly 1MHz, since that is a harmonic
of 1/2 the sampling frequency.  You would want to adjust your sampling
frequency slightly, by a factor of 5/1000000...