RZ,nI: Claude Shannon

From: Clint Wolff <vaxman_at_qwest.net>
Date: Wed Feb 28 20:27:39 2001

On Wed, 28 Feb 2001, Gabaly, Stephen J wrote:

>
>
> > -----Original Message-----
> > Some of Shannon's better known known theorems include
> > the Sampling Theorem, which indicates that a bandwidth-limited
> > signal can be reconstructed only if sampled at least at twice
> > the frequency of the highest-frequency spectral content.
> >
> Take a 1 Vpp_at_40Hz Sinewave, highest-frequency spectral content is 40Hz,
> sample it at twice this frequency, 80Hz, sample at 0 and 180 degrees (0Vpp
> Amplitude), the reconstructed sinewave will be 0Vpp at 0 Hz. Oh well, guess
> Shannon's theorem is incorrect...
>
> steve
>
>

Actually, you must sample at MORE than twice the highest signal
frequency, and wasn't it Nyquist that proved this?




clint
Received on Wed Feb 28 2001 - 20:27:39 GMT

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