An echoic room model for acoustic simulations by non‐reflection boundaries using the Bergeron method

An analytical model of anechoic rooms by distributed equivalent circuits is constructed in the computer using the Bergeron method [Shimoda et al., ‘‘Analysis of sound fields in rooms using Bergeron’s method,’’ Trans. I.E.C.E. Japan, 72 A, 1, 1–11 (1989); English transl., 1989 Electronics and Communications in Japan, Part 3, Vol. 72(12), Scripta Technica, Inc. (Wiley, New York, 1990)]. In this analytical method, the nonreflection boundaries are modeled by gradually increasing sound transmission losses in specific regions near boundaries just like a sand beach exposing sea waves. Also, the sound transmission characteristics or the sound pressure distributions in the room are investigated. The model can be applied to the sound scattering analysis by an arbitrary object.