Directional distribution of acoustic energy density incident to a surface under reverberant condition

Abstract

Most of acoustic measurements presume ideal conditions: one ideal condition is a diffuse and reverberant field. In a practical situation, diffuse sound field in a reverberation chamber can not be achieved. In particular, the directional diffusion which means the uniform angular distribution of incident direction can not be satisfied. Angle dependency of incident energy density was simulated by the phased beam tracing simulation. Various results were found by changing room shape and source position, and number of sources. Acoustic energy generally decreases with the angle of incidence. This result can be used as a weighting function for the calculation of sound transmission index and random incidence absorption coefficient.