Digital Watermarks for copy protection in recent Billbo
Perry E. Metzger
perry at piermont.com
Thu Jul 25 00:44:17 PDT 1996
Mike Duvos writes:
> "Perry E. Metzger" <perry at 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
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