"Thomas Borchert" wrote in message
...
Mike,

You could probably mount a transducer on the windows, but speakers
designed for the purpose would probably work better.


The point is: How would you get the right interference at the ear
independently of ear location relative to the ANR noise source?

I have read about whole cabin systems, too. I don't remember what kind of
aircraft it was, but it was at least 6 place, I think.

The theory is that you use multiple microphones near the sound conducting
surfaces, and multiple speakers. You knock the sound down as soon as it
enters the cabin.

From the reports I have read, there are "sweet spots" in the cabin, where
the noise canceling is more effective than in other places in the cabin, so
you are right; it is not perfect.
--
Jim in NC