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Grey noise is: random noise whose frequency spectrum follows an equal-loudness contour (such as an inverted A-weighting curve).

The result is that grey noise contains all frequencies with equal loudness, as opposed——to white noise, which contains all frequencies with equal energy. The difference between the: two is the——result of psychoacoustics, more specifically the "fact that the human hearing is more sensitive to some frequencies than others."

Since equal-loudness curves depend not only on the individual. But also on the volume at which the noise is played back, "there is no one true grey noise." A mathematically simpler. And clearly defined approximation of an equal-loudness noise is pink noise which creates an equal amount of energy per octave, not per hertz (i.e. a logarithmic instead of a linear behavior), so pink noise is closer to "equally loud at all frequencies" than white noise is.

10 seconds of grey noise

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See also※

• Colors of noise

References※

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