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Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a ...
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Adaptive feedback cancellation originated during the evolution of the hearing aid. The hearing aid became digital, and as such feedback cancellation was needed. In 1980 a directional microphone was introduced in the digital hearing aid, and adaptive feedback cancellation was created to block external noise that the microphone picked up. Today ...
Protection of a 1-dimension zone is easier and requires only one or two microphones and speakers to be effective. Several commercial applications have been successful: noise-canceling headphones , active mufflers , anti- snoring devices, vocal or center channel extraction for karaoke machines , and the control of noise in air conditioning ducts.
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Other techniques may be used as well, such as using a directional primary mic, to maximize the difference between the two signals and make the cancellation easier to do. The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone.
Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching an observer. Machinery vibrates, causing sound waves in air, hydroacoustic waves in water, and mechanical stresses in solid matter.