Noise Cancelling Headphones - The Basics of How They Block Unwanted Noise2777155

You will find basically two kinds of headphones designed to reduce background noise. Passive noise cancelling headphones and app for noise cancelling. The passive type muffles extraneous sounds while 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 a cup, which surrounds the ear. The rim with this cup is constructed of a high-density foam and sound wave dampening material. This results in a seal that blocks approximately 20 dB of noise.

Active-

The active noise cancellation headphones produce an additional 20dB of noise reduction compared to passive type. It employs exactly the same technology (circum-aural sound dampening design) as 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 picks up external noise how the aural cushions from the passive headphones cannot block out. The phase cancelling technology is able to analyze the intensity and frequency of the pitch, also known as the loudness and pitch with the noise. The circuitry then creates an exact replica of 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" in addition to whatever it is that you are listening to. This artificial noise may be the exact opposite from the extraneous noise that means it is past the ear cushions. Then they cancel the other person out as a result of 180-degree phase reversal. As a result the external noise is reduced significantly, allowing you to enjoy your audio using a dramatic decline in background noise.

These kinds of headphones are fantastic for airplanes or any place where there quite a bit of external noise. On airplanes, for instance, this type of noise reduction with all the headphones will dramatically reduce fatigue.

Another difference between the two is that the active type requires a power source, usually a battery.

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