Noise

<p>Noise is <a href="/facts/Sound/DlKXlPuF">sound</a>, chiefly unwanted, unintentional, or harmful sound considered unpleasant, loud, or disruptive to mental or <a href="/facts/Hearing/EPYrVkSx">hearing</a> faculties. From a physics standpoint, there is no distinction between noise and desired sound, as both are <a href="/facts/Vibration/sGgDqG71">vibrations</a> through a medium, such as air or water. The difference arises when the brain receives and perceives a sound. Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, <a href="/facts/Noise_(electronics)/Izbv38Rr">noise in electronics</a> may not be audible to the human ear and may require instruments for detection.
</p><p>In <a href="/facts/Audio_engineering/eRJkg89Q">audio engineering</a>, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a <a href="/facts/Hiss_(electromagnetic)/adebudWC">hiss</a>. This signal noise is commonly measured using <a href="/facts/A-weighting/nvBjQ5We">A-weighting</a> or <a href="/facts/ITU-R_468_weighting/kMEdMoNM">ITU-R 468 weighting</a>. In <a href="/facts/Experimental_science/esltM54f">experimental sciences</a>, noise can refer to any random fluctuations of data that hinders perception of a signal.
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Noise open-in-new

Noise