17 Dec
2003
17 Dec
'03
11:17 p.m.
Mike Duvos writes:
"Perry E. Metzger" <perry@piermont.com> writes:
The Nyquist Theorem states you need exactly twice the samples, not over twice. The magic number isn't something like 2.2, its exactly 2.
The Sampling Theorem states that equally spaced instantaneous samples must be taken at a rate GREATER THAN twice the highest frequency present in the analog signal being sampled.
That is just about what I said. The point is that the magic number isn't 2.2 or anything similar -- the breakpoint is exactly twice the frequency.
Although anything over twice the highest frequency will work in a theoretical sense, a small fudge factor does wonders for digital signal processing,
I believe I mentioned the need for that, too. Perry