音源の指向性が室内音場評価に与える影響 : 既存ホールの実測による検討

概要

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The purpose of this study is to make clear the effect of the fundamental characteristics of sound source on the stage of auditoria, that is, directivity pattern, orientation of main axis and location of source, on the acoustical properties and the evaluation of sound fields, although they are ordinarily estimated only with an omni-directional source. In our previous works, the results of geometrical simulation showed that the directional characteristic of sound source affected significantly the acoustical quantities such as the ratio of early-to-late sound energy and lateral energy fraction. In this paper, the acoustical measurement is performed in real auditoria to examine the validity of the evaluation with the directional sound source. The result shows that there is a significant difference between the acoustical quantities with an omni-directional loudspeaker and a directional one whose directivity is produced on the basis of measured characteristics of the strings, and that the directional characteristics of sound source are very important factors in the acoustic design of concert auditoria.
九州大学の論文