基于可控波束响应的球形传声器阵列定位方法研究

Study of controllable beam response algorithm for spherical microphone arrays

球形传声器阵列因其完全对称的结构,可在三维空间内实现有效的声源定位。文章重点关注基于球谐函数展开的可控波束响应算法,推导了算法的实现流程,并通过仿真验证了可控波束响应算法的性能。建立了包含8个传声器单元的实验系统,其中球形结构在8个单元的条件下可以视为立方结构,通过低阶球谐展开实验验证了可控波束算法的性能。在视听室的实验结果充分验证了定位算法的有效性,定位误差小于10°。

Spherical microphone arrays can realize effective beamforming and localization in 3-D space because of its completely symmetrical structure. This paper focuses on the controllable beam response algorithm based on spherical harmonic function expansion. The implementation process of the algorithm is derived, and the performance of the algorithm is verified by simulation. An experimental system containing eight microphone units is established. The spherical structure under the condition of 8 units can be seen as a cubic structure. Through the experiment of low order spherical harmonic expansion, the performance of the controllable beam algorithm is verified. The experimental results in the audiovisual room validate the effectiveness of the localization algorithm, and the error of localization is less than 10 degrees.