Noise
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Noise is sound, chiefly unwanted, unintentional, or harmful sound considered unpleasant, loud, or disruptive to mental or hearing faculties. From a physics standpoint, there is no distinction between
NASA researchers at Glenn Research Center measuring aircraft engine noise in 1967
The urban police of Milan while using a noise measurement device for sound level control on city streets in 1955
White noise
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In signal processing, white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density. The term is used with this or similar meanings in man
Noise
…to the human ear and may require instruments for detection. It can also refer to an intentionally produced random signal or spectral noise, such as white noise or pink noise. In audio engineering, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a hiss…
Spectrogram of pink noise (left) and white noise (right), shown with linear frequency axis (vertical) versus time axis (horizontal)