21
Aug
09

Noise cancelling headphones


How many of us wish that they could do away with the noise of the traffic? Or with people talking loudly at public places? Well, here is a solution.

Noise-cancelling headphones reduce unwanted ambient sounds (i.e., acoustic noise) by means of active noise control (ANC). Essentially, this involves using a microphone, placed near the ear, and electronic circuitry which generates an “antinoise” sound wave with the opposite polarity of the sound wave arriving at the microphone. This results in destructive interference, which cancels out the noise within the enclosed volume of the headphone.

Noise cancellation makes it possible to enjoy music without raising the volume excessively. It can also help a passenger sleep in a noisy vehicle such as an airliner. Noise-cancelling is particularly effective against airplane engine noise.

Dr. Amar Bose (founder of the Bose Corporation) began work on his noise-cancelling headphones in 1978 on board an airplane. During the international flight, he was provided with a set of headphones from the airline and almost immediately realized how dissatisfied he was with their quality and the loud engine noise. After nearly a decade of research, Bose would release the first noise-cancelling headphones.

I was checking for the brands of such headphones available in the market. This site gives a fairly large range of noise-cancelling headphones with the price range starting from $50.

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