There are essentially two types of headphones to reduce background noise, passive noise cancelling headphones and active noise canceling headphones. The Panasonic RP-HC500 noise cancelling headphones fall into this the active category. The passive type muffles extraneous sounds while the active ones electronically decrease extraneous noise.

Passive

Passive noise cancelling headsets utilize what is known as circum-aural sound dampening design. They are modeled like a cup, which the ear. The rim of this cup is of a high-density foam and sound wave dampening substance. This a seal that blocks up to 20 dB of noise.

Active

The Panasonic RP-HC500 noise cancelling headphones yield an additional 20dB of noise than the passive type. It uses the same (circum-aural sound dampening design) as the passive headphones but also phase cancellation. This is the key component of active noise cancelling headphones. A microphone is inside the headphone that picks up external noise that the aural cushions of the passive headphones are to block out. The phase cancelling technology is capable of analyzing the intensity and frequency of the pitch, also known as the loudness and pitch of the noise. The then creates an exact copy of the noise and throws it 180 degrees out-of-phase. This, for all intents and purposes, the sound.

The headphone speaker then plays this “sound” along with whatever it is that you are . This noise is the exact inverse of the extraneous noise that makes it past the ear cushions. They will then cancel each other out because of the 180-degree phase reversal. As a result the external noise is curtailed significantly, allowing you to your audio with a dramatic in background noise.

These kinds of headphones are superb for airplanes or any place where there is a lot of external noise. On airplanes, for example, this type of noise subtraction while using headphones will seriously reduce fatigue.

difference between the two is that the active type needs a power source, a battery.

Noise cancelling headphones have a tendency to be larger and heavier than regular headsets or earphones. They can, nonetheless, be more comfortable when worn for lengthy periods of time due to the cushions that impose less pressure on the ears. The Panasonic RP-HC500 noise cancelling headphones are one of the most popular choices.

by Rodney Hodge

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Jose L. Borges runs No Noise HeadPhone- where you will find a selection of Noise Cancelling Headphones. Includes reviews, photos and user ratings.
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