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Re: Digital Watermarks for copy protection in recent Billbo




Mike Duvos writes:
> "Perry E. Metzger" <[email protected]> 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