Noise Canceling Headphones

During a recent plane flight, I got to experience the joy of Noise Cancelling Headphones. They work using level matched phase inversion of sound which cancels out any exterior noises. They feature two small microphones [one on the side of each ear piece] and measure the external sound levels. By playing the sound back into the head set at the same level [now phase inverted], the noise is cancelled out. Just brilliant!

Other brands like Sennheiser also now produce noise cancelling head phones as well.

Mark

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