Noise free headphones help the users listen to the sound in their headphones by eliminating the ambient noise. Many times, while listening to music on the headphones, external sounds leak in and cause disturbance in the sounds coming from the headphones. This problem is mostly experienced in planes, trains, public places and other noisy environment. In such places noise free headphones are a must if you want to listen to your music clearly and in peace. Noise free headphones are basically of two types:
Passive noise free headphones: This type of headphone obstructs the external noise based on its construction. Passive noise free headphones are composed of high-density foam or any suitable sound isolation material; hence they are heavier and bigger than normal headphones. In general, the circum-aural design of these headphones is considered to be the best in blocking external noise.
Active noise free headphones: Active noise-canceling headphones are more sophisticated version of passive noise free headphones. These headphones employ a technology called Active Noise Control (ANC) to cut down on ambient noise. In these headphones, an electronic circuitry produces a wave signal of opposite polarity to an external sound signal. In technical terms this procedure is known as destructive interference, where two signals of opposite polarity are superimposed to cancel out each other. Hence, they give the user a noise free experience. A typical active noise free headphone has the following components.
• Microphone: A small microphone is placed inside the headphone to detect external sounds which cannot be blocked passively.
• Noise-canceling circuitry: This circuitry is the main component of a noise free headphone. It helps in eliminating the external sound by producing a wave of opposite wavelength to the external noise that is captured through the microphone.
• Speaker: The internal signal produced by the noise-canceling circuitry is fed into the headphones' speakers to reduce the effect of ambient noise.
• Battery: A battery source is required to power up the active noise cancellation circuitry. It supplies the energy to carry out the process of destructive interference. Normally, the headphones contain AAA size battery or a rechargeable battery.
Noise free headphones are ideal for frequent air travelers, daily commuters, office workers, or any person who wants to listen to crystal clear music devoid of external noise. You can buy noise free headphones from some of the top manufacturers by logging on to www.sjtelecommunication.com. Here you can find GN US Inc. headsets, Motorola headsets headsets, Plantronics headsets, Sennheiser headsets and more.
About Author:
Jeff is a professional author who has written many articles on various topics & this time writing article on What Are Noise Free Headphones. For more details about What Are Noise Free Headphones visit: http://www.sjtelecommunications.com/