In auditoriums, multi-function halls, theaters, broadcasting studios, meeting rooms, recording studios, concert halls, etc., sound quality and reverberation time are of great importance. To meet the usage requirements of these venues, acoustic simulation and acoustic physical index calculation are carried out. Soundproof panels, soundproof doors, sound-absorbing panels and diffusers are used for acoustic treatment to eliminate acoustic defects such as echoes, multiple echoes, sound focusing, standing waves, and muddled sound perception, thereby achieving the effect of noise reduction and clear sound perception.

In recent years, the industry has recognized that the delay time, arrival direction, and sound intensity of "reflected sound" are important factors in determining the sound quality of a room. As a method to understand the arrival time and direction of this reflected sound, we have conducted simulations using a "geometrical acoustics" based backtracking method. This method geometrically captures the propagation and diffusion of sound energy and can calculate reverberation time, echo time patterns, sound maps, and directionality diffusion, providing technical basis for acoustic design.