"Carey Carlan" wrote in message
. 203

As a non-mathematical type I understood Doppler distortion to be
caused when a high frequency was generated by a driver already in
motion with a low frequency.

That's it.

The example was a woofer moving full excursion on a very low tone
while generating a higher tone. Let's do an extreme case of a 10 Hz
excursion and a 1000 Hz tone. Every 20th of a second (change in
direction at 10 Hz) the pitch of the 1000 Hz tone would change as its
vibrating medium (the woofer cone) changed from moving toward the
listener to moving away.

Yes, that's it. Just like the whistle on a busy train engine in a switch
yard. No amplitude modulation distortion required.

I probably have an easier time than most with this sort of thing because of
my long-ago tour with Uncle Sam as a Doppler Radar technican.

If some of the arguments presented were taken to their logical conclusion,
the whole missle system I worked on would have never worked.

While high tech military toys of that era tended to be dodgy, the one I
worked on could at least partially work, and did I see the most important
parts of it work from incoming bogey to big bang in the sky.