イメージ拡散法に基づく残響場の理論的考察

概要

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Both the image theory and the classical theory of reverberation are practically used in room acoustics to predict sound fields in enclosures. In the present paper, we show that the result of image theory corresponds to the Sabine's result provided that discrete distribution of real and image sources is smoothed appropriately. This idea is expanded to sound field in tunnel or corridor (i. e. , two-dimensional enclosure) as well as in space between two parallel walls (i. e. , one-dimensional enclosure), for predicting them. Then, we compare the reverberant characteristics among three types of sound fields mentioned above. It is found that especially in early decay process the sound fields in one- and two-dimensional enclosures diminish much more rapidly than those in rooms. Furthermore, it is theoretically demonstrated that the reverberant fields in one- and two-dimensional enclosures yield convexly curved decay curves.
社団法人日本音響学会の論文
1985-10-01