Exactly How Noise Canceling Headphones Function

Have you been on a plane with your headphones, and found yourself unable to enjoy that movie you were watching because there was an excessive amount of noise from the engine, your snoring seatmate, or other noise producing factors around you that you could still hear? Have you found yourself wishing you could enjoy that train ride better, if perhaps you could enjoy your own personal in-ear entertainment but rather disappointed because you got that unwanted train mechanism hitting the rail tracks? Don’t you wish there was some way to cancel out those unwanted sounds from your surrounding and isolate what you would like to hear from the headphones in the purest timbre?

These were the same wishes which Lawrence J. Fogel and Dr. Amar Bose had in mind once they began developing earphones that could isolate unwanted ambient noise. They both individually attempted to study and develop ways to produce something which would answer their dissatisfaction to noise caused the airplane’s engine while riding an airplane. After a decade of researching and development, the very first noise cancelling headphones were released by Bose.

Noise-cancelling headphones are designed to minimize those unwanted noises around one’s environment.They help isolate the produced sound by producing reverse polar sound waves like those which are coming from the external surroundings. That is made possible by Active Noise Control or simply referred to as ANC.

ANC basically works though a microphone, placed close to the ear, which serves as the sensor. If this picks up those external sounds, its electric circuitry produces sound waves which are reverse in polarity. Acting as anti-noise sound waves, the sound picked up externally is cancelled and minimized to the listener wearing the noise-canceling headphones. The result is pure sound quality at whatever volume is selected.

Currently on the market, you should typically find Noise Canceling headphones which have ANC for mostly low frequency noise. The reason being lower frequency sound waves sound multi-directional rather than sounding from a singular source, rendering it easier for the ear to pick up. They would also contain longer wave lengths which make it harder to block.

For sounds that have higher frequencies and are shorter in wave lengths, companies would usually depend on their other noise minimization techniques, for example ear cups design and materials, to block them. As these have shorter wave lengths, they can be simpler to block and block out.

With the thought of frequency and wave sound length having an inverse relationship, companies have opted to produce noise-canceling headphones with an ANC for lower frequencies only since it would entail having a more simple electronic circuitry. Other techniques anyway could be sufficient to make the noise-blocking effect that one would wish in a noise-canceling headphone.

Noise-canceling headphones are actually gaining their popularity all over the world. Not only do they have entertainment benefits, but ear-drum maintenance too. As a user wouldn’t need to raise the volume to hear only what he or she is hearing, less stress is put on the ear drum. Talk about a double benefit!

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