A noise-canceling microphone is one that cancels any unwanted, disturbing surrounding sounds by using an active noise control. In this process, the microphone is placed near the ear and the electronic circuitry generates an antinomies sound wave that is 180 degrees out of phase, from the sound coming towards the microphone.
Some of the companies that make noise-canceling microphones are Sony, Aiwa, and Bose. The advantage that these types of microphones provide is that they are not very taxing on the electronic circuitry. One of the disadvantages of using a noise-canceling microphone is that they need an electrical supply from a battery. Sometimes, they emit high frequency hissing sounds that become annoying after some time.
The models available in the market are, Aiwa HP CN 6, AKG k 28 NC, Bose Quite Comfort, and Jensen c51. Noise canceling microphones are very useful when listening to music, when installed in lawn mowers, and refrigerators. Noise canceling microphones are also used in the military, to receive accurate and clear audio communication. Telephone conversations can also be made noise free with the help of these microphones. Mountaineers who undertake difficult expeditions also benefit from these microphones because some models are designed to work in a full pressure type oxygen helmet. Telephones can be modified and made easier to operate by installing these microphones. The noise in the background makes it very difficult for the speaker to understand the person at the other end. These microphones clarify speech, which would otherwise end up as a muffled, annoying conversation.
It can be clearly judged from the observations made on these microphones that noise-canceling microphones are used in every walk of life and in almost every profession, especially the entertainment industry. These microphones have revolutionized the approach towards noise pollution and keeping it effectively under control.
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