Noise Cancelling Headphones - The fundamentals of How They Block Unwanted Noise3644310

There are basically 2 kinds of headphones developed to reduce background noise. Passive noise cancelling headphones and noise cancelling app free download. The passive type muffles extraneous sounds even though the active ones electronically decrease external noise.

Passive-

Passive noise cancelling headsets use what is known circum-aural sound dampening design. They're shaped like just one cup, which surrounds the ear. The rim of this cup is constructed of a high-density foam and sound wave dampening material. This results in a seal that blocks up to 20 dB of noise.

Active-

The active noise cancellation headphones provide an additional 20dB of noise reduction compared to the passive type. It employs the same technology (circum-aural sound dampening design) since the passive headphones but in addition incorporates phase cancellation. Here is the key feature of active noise cancelling headphones. A microphone is placed inside the headphone that sees external noise that the aural cushions with the passive headphones can't block out. The phase cancelling technology is able to analyze the intensity and frequency from the pitch, also known as the loudness and pitch with the noise. The circuitry then creates an exact replica with the noise and throws it 180 degrees out-of-phase. This, for those intents and purposes, eliminates the sound.

The headphone speaker then plays this "non-sound" along with whatever it is that you will be listening to. This artificial noise is the exact opposite with the extraneous noise that makes it past the ear cushions. Then they cancel each other out as a result of 180-degree phase reversal. Consequently the external noise is reduced significantly, letting you enjoy your audio using a dramatic decrease in background noise.

These kinds of headphones are perfect for airplanes or anywhere where there quite a bit of external noise. On airplanes, for instance, this type of noise reduction while using the headphones will dramatically reduce fatigue.

Another distinction between the two is that the active type needs a power source, normally a battery.

Noise cancelling headphones are usually larger and heavier that regular headsets or earphones. They are able to, however, be more comfortable when worn for too long periods of time due to the large cushions that impose less pressure about the ears.