Re: Alternating Current

[James Mclean <jmclean@CHEM.UCSD.EDU>]

JACK L. URETSKY wrote:
>        David used a sampling interval of 10^-4 s, and took 100 data points.
> He therefore sampled over a time interval of 10^-2 s.  What was the precision
> of his result?  Aha, the uncertainty principle rears her pretty head:
>        (delta t)*(delta f) = 1
Could you justify your version of the uncertainy principle here?

It seems to me that if we allow arbitrarily precise measurement of a signal
known to be sinusoidal, and allow as many samples as desired, then the
frequency can be determined to arbitrary precision with an arbitratily
short sample.

--
--James McLean
jmclean@chem.ucsd.edu
post doc
UC San Diego, Chemistry