Noise Cancelling Headphones - The Basics of How They Block Unwanted Noise9603267

There are basically two types of headphones created to reduce background noise. Passive noise cancelling headphones and online background noise remover. The passive type muffles extraneous sounds as the active ones electronically decrease external noise.

Passive-

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

Active-

The active noise cancellation headphones produce an additional 20dB of noise reduction than the passive type. It employs the same technology (circum-aural sound dampening design) because the passive headphones but also incorporates phase cancellation. This is the key feature of active noise cancelling headphones. A microphone is put inside the headphone that accumulates external noise how the aural cushions of the passive headphones are unable to block out. The phase cancelling technology is able to analyze the intensity and frequency with the pitch, also known as the loudness and pitch of the noise. The circuitry then creates a perfect replica of the noise and throws it 180 degrees out-of-phase. This, for all 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 may be the exact opposite with the extraneous noise that makes it past the ear cushions. Then they cancel each other out due to the 180-degree phase reversal. Consequently the external noise is reduced significantly, enabling you to enjoy your audio having a dramatic decrease in background noise.

These kind of headphones are perfect for airplanes or any place where there is a lot of external noise. On airplanes, for instance, this type of noise reduction with all the headphones will dramatically reduce fatigue.

Another among the two is that the active type takes a power source, normally a battery.

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