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grey noise
Grey noise is random noise subjected to a psychoacoustic equal loudness curve (such as an ''inverted'' A-weighting curve) over a given range of frequencies, giving the listener the perception that it is equally loud at all frequencies.
This is in contrast to white noise, noise which has the same energy at all frequencies but is not perceived as equally loud to psychoacoustics. ''See Colors of noise''.
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.〔http://www.audiocheck.net/testtones_greynoise.php〕 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.〔http://www.acousticfields.com/white-noise-definition-vs-pink-noise/〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「grey noise」の詳細全文を読む
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