An improved geometrical sound field analysis in rooms using scattered sound and an audible room acoustic simulator

Abstract A geometrical computer simulation model and an audible room acoustic simulator, based on ray tracing with scattering effects, are presented. This calculation model classifies the receiving sound energy into three types. Direct sound energy is calculated with the inverse square law, and early reflected and diffuse sound energy are calculated with the effective geometrical reflection energy coefficient using a simple diffraction theory for a finite free reflecting panel. Two actual halls are used to compare measured and computed values of four acoustic parameters: Clarity (C), deutlichkeit (D), lateral efficiency (LE), and room response (RR). It has been found that the new calculation model is a better evaluator of C, D and RR than the traditional ray tracing method. The room acoustic simulator has been used to simulate sound in the halls using 15 channels. The simulator can judge acoustic impressions in the presence of reverberation, clarity and spaciousness.