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An internal processor then measures the sonic properties of those samples, and generates sound waves that are exact opposites.The ear cups are still more awkward than normal headphones, but the noise canceling makes up for that.Audiophiles swear nothing can compete with Bose’s Quiet Comfort (0 from Bose.com). (Shrill horns, alas, may still annoy; noise cancelers primarily filter low-frequency sounds.) The processor, unfortunately, adds considerable heft to these otherwise wondrous contraptions.On most models, the noise-canceling unit is housed in a separate box that must either be clipped onto a belt or stuffed into a shirt pocket—sort of a hassle if you’re already stowing away an MP3 or Mini Disc player.
Readers with vague memories of Physics 101 may recall that contrary waves neutralize one another.