非対称ホール空間の音場特性に関する研究 : その3 反射音レベル分布に関する幾何音響的考察

概要

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The purpose of this study is to investigate the relation between acoustic characteristics of sound field and the fundamental room shape of auditoria from the point of view of geometric features of the space, namely, symmetric or asymmetric, and to make clear the acoustical validity of asymmetric room shape in acoustic design. In this paper, the spatial distributions of reflection levels are investigated in 17 hall models, whose walls and ceilings are entirely reflective, by means of geometrical acoustic simulation. The results show that there is a significant difference in the attenuation of reflected energy due to the source-receiver distance between symmetric and asymmetric shapes, and particularly, the increase in late-arriving sound level is found at the rear seats in the asymmetric halls. These are caused by an increase of the number of geometrical reflections. The present results definitively confirmed our previous findings in the absorptive hall models. Finally, more options and possibilities in acoustic design methods can be realized by considering the contribution of asymmetric configuration to the uniformity of sound fields.