I found an article in the Tech section of MSN.com a few days ago that gives a good explanation of how noise-cancelling headphones work. If you can get past the groaner of an introduction and a slightly confusing diagram, it's got some good stuff in there.
"Noise Cancellation Headphones"
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There's a lot that bothers me about that article, but this is The Listening Blog and not The Writing Style Blog, so...
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