Department of Media Technology, Aalto University School of Science, P.O. Box 15400, FI-00076 Aalto, Finland.
J Acoust Soc Am. 2012 Jun;131(6):4606-14. doi: 10.1121/1.4711013.
Reflections at rough surfaces change the temporal structure of the reflected signal. This paper shows how to incorporate this temporal behavior in geometric room acoustics modeling. Specifically, a beam tracer is used for calculating the image sources and reflection paths. The roughness of the surfaces is taken into account in post-processing. A single reflection is assumed to distribute the energy according to an exponential function in time based on Biot's rough surface modeling theory. Multiple reflections are modeled with convolutions of exponential functions which are approximated as gamma functions.
在粗糙表面上的反射会改变反射信号的时间结构。本文展示了如何在几何房间声学建模中纳入这种时间行为。具体来说，使用束迹追踪器来计算镜像源和反射路径。在后期处理中考虑了表面的粗糙度。根据 Biot 的粗糙表面建模理论，单次反射假设根据时间的指数函数分布能量。多次反射则使用指数函数的卷积来建模，这些卷积被近似为伽马函数。
