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How noise canceling headphones work.

Lots of people these days enjoy music with the advent of the portable cd player, ipod, mp3 players, and mp4 players. It's becoming more and more common to see people at work, in an office, on the bus, on a plane or doing any other boring mundane task with a set of headphones on. But noisy areas and devices can be a pain. Couldn't some one just find a way to block it all out?

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