非対称ホール空間の音場特性に関する研究 : その5 断面形状モデルに関する検討

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, and to make clear the acoustical validity of asymmetric room shape in acoustic design. In this paper, the relation between the symmetrical property of cross-section geometry and the distributional characteristics of acoustic parameters is investigated in the hall models, whose floor-plan is either reversed fan-shape or shoebox-shape and inclination angles of both sidewalls are varied from +15° to - 15°, by means of geometrical acoustic simulation. From the results, the distinct tendency cannot be found in the parameters of early-to-late energy ratio C_<80>, lateral energy fraction LF and the sound pressure levels. However, the results show that the higher the index δ_S, representing the degree of asymmetricity, is, the better the spatial balance of directional late energy ratios becomes, which are the ratios of lateral, vertical and longitudinal energy components to the total energy. This fact means a diffusive effect of asymmetric cross-section, because the diffusiveness of sound fields is strongly dependent on the properties of late energy.
九州共立大学の論文