Specifically How Noise Reducing Headphones Function

Have you ever been on a plane using your headphones, and found yourself unable to enjoy that movie you were watching because there was clearly too much noise coming from the engine, your snoring seatmate, or other noise producing factors around you that you could still hear? Have you ever found yourself wishing you could enjoy that train ride better, if perhaps you could enjoy your 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 block out those unwanted sounds from the surrounding and isolate what you would like to hear from the headphones in the purest timbre?

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

Noise-cancelling headphones are intended 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. This is made possible by Active Noise Control or simply referred to as ANC.

ANC basically works though a microphone, placed near the ear, which serves as the sensor. When this hears 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, one would typically find Noise Canceling headphones that have ANC for mostly low frequency noise. The reason being lower frequency sound waves sound multi-directional instead of sounding from a singular source, making it easier for the ear to pick up. They would also contain longer wave lengths which can make it harder to block.

For sounds which have higher frequencies and are shorter in wave lengths, companies would usually depend on their other noise minimization techniques, such as ear cups design and materials, to block them. As these have shorter wave lengths, they’d be easier to block and block out.

With the idea 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 because 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 around the world. Not only do they have entertainment benefits, but ear-drum maintenance at the same time. Because a user wouldn’t need to raise the volume to hear only what he or she is listening to, less stress is placed on the ear drum. Talk about a double benefit!

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