Unwanted sound / From Wikipedia, the free encyclopedia

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Noise is unwanted or harmful sound considered unpleasant, loud, or disruptive to hearing. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound.[1][2]

NASA researchers at Glenn Research Center measuring aircraft engine noise in 1967

Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, noise in electronics may not be audible to the human ear and may require instruments for detection.[3]

In audio engineering, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a hiss. This signal noise is commonly measured using A-weighting[4] or ITU-R 468 weighting.[5]

In experimental sciences, noise can refer to any random fluctuations of data that hinders perception of a signal.[6][7]

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