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(Mike Rivers) writes:

In article writes:

Group delay is the derivative of phase with respect to *frequency*.
Frequency is the derivative of phase with respect to *time*.

Acceleration is the derivitive of *velocity*

My point was two-fold:

a) phase is used differently in different contexts and the
"derivative" in one context gives you a completely different
quantity than the derivative in the other.

b) stating that A is a derivative of a function B is, generally,
useless unless you state which variable the derivative is taken by.

See, I have a physics book, too.

If you needed a physics book to remember that, you're losing
it.
--
Randy Yates
Sony Ericsson Mobile Communications
Research Triangle Park, NC, USA
, 919-472-1124