A STATISTICAL APPROACH FOR THE DIFFUSION OF SOUND BY REFLECTING SURFACES IN LARGE ENCLOSURES

This paper is concerned with the applicability of a time series model for the separation of the reflected noise energy by rough reflecting s urfaces into diffuse and geometrically reflected noise. For the deriva tion of the theoretical model a combination of theory of geometrical a coustics and statistical acoustics was used. Here the measured noise a t the receiver position is assumed to be the superposition of three ty pes of noise: the direct which follows the inverse square law, the geo metrically reflected which follows Snell's law, and the diffuse noise which propagates omnidirectionally and decays following an exponential law. The solution of the problem is finally achieved in the time doma in statistically, by the use of time series analysis.