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Repetition pitch
Repetition pitch is an unexpected sensation of tonality or pitch that often occurs in nature when a sound is reflected against a sound-reflecting surface (for example: a brick wall), and both the original and the reflected sound arrive at the ear of an observer, but with a short time delay between the two arrivals.
==Pitch and delay time==
When the delay of the repeated sound is too large, the observer perceives an echo; when the delay of the repeated sound is generally smaller than 30 ms, he perceives the original sound only, but with a tonality (coloration, pitch) superimposed. Therefore, this perceptual phenomenon has been named Repetition Pitch (RP). In general, the perceived RP (expressed in Hz-equivalent) is equal to the reciprocal value of the delay time (T) between the original and the repeated sound, or in formula: RP = 1/T (with T expressed in seconds). RP is most salient when the original sound is wide-band in frequency content and does not produce pitch itself (like white noise, which contains all audible frequencies in equal strength).〔Bilsen, F. A., and Ritsma, R. J. (1969/70). “Repetition pitch and its implication for hearing theory,” Acustica 22, 63-73.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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