Have you ever been on a plane with your headphones, and found yourself not able to enjoy that movie you had been watching because there was a lot of 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 striking the rail tracks? Don’t you wish there was a way to cancel out those unwanted sounds from the surrounding and isolate what you want 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 when they began developing earphones which could isolate unwanted ambient noise. They both individually tried to study and develop solutions 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 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. This really 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. 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 end 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. It is because 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 make it tougher 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 cancel 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 much more simple electronic circuitry. Other techniques anyway could be sufficient to produce 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 also. Because a user would not 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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