ASA 124th Meeting New Orleans 1992 October

4aAA4. The development of an audible simulator of sound fields and verification of simulation accuracy.

Tohru Miyajima

Kiyoshi Nakagawa

Yasuhiko Tahara

Acoustics Group, Inst. of Technol., Shimizu Corp., 4-17 Etchujima 3-Chome, Koto-ku, Tokyo 135, Japan

Shoichi Takane

Kenji Ozawa

Yoichi Suzuki

Toshio Sone

Tohoku Univ., 2-1-1 Katahira, Aoba-ku, Sendai 980, Japan

A multichannel-type audible simulator with two special features, such as scattering sound and a way to determine production condition of reverberation, is developed. Using geometrical sound analysis with sound-scattering phenomenon, a sound field model of the simulator is composed of direct sound, initial reflection, reverberation, and scattered sound. Also, a new way to determine the production condition of reverberation is proposed. To examine the similarity between a simulated sound field and a real sound field, physical and psychological experiments are performed. It is found that acoustic indices, such as C80 (clarity), modulation transfer index (MTI), and time gravity (schwerpunktzeit), of simulated sound fields approximately agree qualitatively with those of the real sound field. The results of psychological experiments using dummy head recordings show that definition has good similarity, and it is necessary to improve reverberation.