Noise

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(1) a sound which contains all of the frequencies in the audible range.

(2) An unwanted sound which is not related to the wanted sound; if it is, it is called distortion. Noise is comprised of all audio frequencies at constantly varying amplitudes, therefore, it has no definable pitch or timbre. 

See white noisepink noiseresidual noiseambient noisequantization noisemodulation noiseNC-Curvenoise floor.

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