A geometrical-numerical method for the determination of the acoustic field properties related to the directions of reflected waves*

A method for theoretical determination of the field in enclosures is presen¬ted. To analyse the directivity of the field, the spatial distributions of the direc¬tions of the reflected waves and their energy are calculated using the geometrical-numerical method. Diffusion coefficients of the directions, energy and ray energy are introduced. These coefficients characterize in general the directional pro¬perties of the field at a given point and determine in detail the values of energy reaching the observation point from different parts of the space. An algorithm for a computer program and the results of numerical calculations for a rectangular room which illustrate the effect of the different parameters of the source-room¬observation point system on the directional properties of the field are given.