AVR-Chat

----- Original Message -----
From: "John Johnson" <johnatl@mac.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Sunday, May 30, 2004 14:53
Subject: Re: [AVR-Chat] ADC problem!


> The sampling frequency must be several times the frequency
you
> want to sample, otherwise, you will see a seemingly random
> sample, or a harmonic of the original frequency. You can
> decide how many points will adequately describe the
> 40Hz sine wave for your project, multiply by 40 and
> use that for the sample frequency. If I were doing it,
> I would use a prime number as the number of samples,
> that way you're guaranteed not to lock onto a
> multiple/harmonic of the frequency you're sampling.
> (The things we learn from Nature :-) Locusts, in
> this case.)
>
> Regards,
>    JJ

What would be the lowest reasonable prime for this?  And why
are prime number sampling rates so great, anyway?

Erikc  - firewevr@airmail.net
///
"An Fhirinne in aghaidh an tSaoil."
"The Truth against the World."
        -- Bardic Motto
/// In theory, there is no difference between theory and
practice, in practice there is.