On Wed, 11 Aug 2004 10:56:27 -0700, Bob Cain
wrote:

I just ask that you draw no conclusions from a system that
contains measurable non-linearity in the transducer itself.

No amplitude non-linearity is needed to generate phase or
frequency modulation.

I'm not following this discussion at all. Are you asking
if a train whistle's pitch changes as it passes by?

Or that a recorded train whistle played through a speaker
doesn't change pitch as it passes by?


Chris Hornbeck