室内障碍物对声传播作用的计算机模拟研究

Study on effects of indoor barriers upon sound propagation with computer simulation

计算声场脉冲响应是数字式可听化研究的核心工作。文章研究了室内声场中存在障碍物的情况下,如何用数值方法模拟脉冲响应的问题。首先提出了根据障碍物特点进行分类研究的方法,然后利用声线跟踪技术和统计学方法,设计了几类障碍物(屏风、隔墙等)情况下模拟声场分布的具体算法。在这些算法中,对镜面反射、扩散反射、散射和透射等现象作了不同程度的考虑。最后,将一个复杂声场模型的仿真计算结果和理论分析作比较,检验了算法的可行性。

In the study of digital auralization, a special computer model should be set up to simulate the impulse response of an enclosure. In previous studies, behaviors of indoor barriers have not been fully investigated. This paper presents different methods for simulating the behaviors of various barriers including screens, a small number of irregular barriers, an intervening wall and a lot of disorderly placed barriers. Corresponding algorithms are developed based on the raytracing technique and statistical method. Phenomena such as specular reflection, diffused reflection, scattering and transmission have been considered. These algorithms are testified by simulation of a complicated model.