Klarinet Archive - Posting 000716.txt from 1997/11

From: Jonathan Cohler <cohler@-----.net>
Subj: RE: Nyquist and analog
Date: Thu, 20 Nov 1997 11:02:51 -0500

>No doubt this shows that "greater than" is better than "equal".

In real life, everyone samples at greater than 2F, for technical reasons.

But the theory is correct at 2F. As I said in another message, the
probability of your sampling device precisely obtaining all the zero
crossings, is precisely 0 and therefore not an issue. An interesting
anomaly to discuss, but not an issue.

> Ian's
>point looks valid, but is it likely, in a real situation, that the
>sampling rate is going to be exactly in phase with one (or more)
>components? Furthermore, nobody is sampling components - what is being
>sampled is a *resultant* waveform.

Exactly.

------------------
Jonathan Cohler
cohler@-----.net