Re: [SI-LIST] : Nyquest Sampling Rate

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From: Mike Jenkins (jenkins@lsil.com)
Date: Fri Mar 30 2001 - 19:15:25 PST


Adam,

It's not two points. It's an infinite sequence of samples T/2
apart. That is, Nyquist's theorem is about steady state. This
infinite sequence of evenly spaced samples unambiguously identifies
a signal if the signal has all components below 1/T in frequency.

Try finding more than one sinewave through the points
A*sin(2*pi*F*n*T/2) where F < 2/T and n=1,2,3,....

Hope that helps.

Regards,
Mike

>
> DEAR SI list subscribers,
> Can any one explain to me how you can recover a
> periodic signal form only 2 samples. I can understand
> the math but I am having difficulty visualizing this.
> Draw me any 2 points in the time domain and I can make
> endless number of periodic signal go through them?
>
> I know I am missing a key point but I can quite put my
> finger on it.
>
> Your input is very well appreciated.
>
> Adam

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