Matching a tonal tempo with camphor leaves moving in the wind
Yoshiharu Soeta, Yoshinobu Uchida and Yoichi Ando

To find tonal tempo matching with an image of camphor leaves moving in the wind, matching tests between this image and periodical sound pulses were performed. Subjects viewed a displayed image of camphor leaves moving in different speeds of wind while simultaneously listening to periodical sound pulses periodicities ranging from 0.08-1.28 s. Results show that the matching period of sound pulses is abouot half of the delay time at the first peak of the autocorrelation function corresponding to the visual pitch which was calculated by the gray levels of moving-leaves images.

Key words:
autocorrelation function (ACF), matching a tonal tempo, the delay time at the first peak of the ACF