On Mon, 22 Aug 2005 00:53:26 -0700, wrote
(in article .com):

If you look at the theory you will see that it is counteracting the
effect of vortices. In fact the perceived noise fron the aircraft is
REDUCED. It is in fact antisound.


As with sound canceling headphones, this would only work locally - as in
needing different cancelation waveforms for each side of the head. The film
would have to be a checkerboard of detectors and generators.

-- Charlie Springer