Spherical beamforming for spherical array with impedance surface

8th TSME-International Conference on Mechanical Engineering

Tontiwattanakul, Khemapat^1

Department of Mechanical and Aerospace Engineering, King Mongkut's University of Technology North Bangkok, 1518 Pracharat 1 Rd, Wongsawang, Bangsue, Bangkok

10800, Thailand^1

关键词: Acoustic beamforming;    Fibrous material;    Frequency ranges;    Impedance surface;    Spherical beamforming;    Spherical harmonics;    Spherical microphone array;    Three dimensional space;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/297/1/012043/pdf
DOI  :  10.1088/1757-899X/297/1/012043

来源: IOP

【 摘 要 】

Spherical microphone array beamforming has been a popular research topic for recent years. Due to their isotropic beam in three dimensional spaces as well as a certain frequency range, the arrays are widely used in many applications such as sound field recording, acoustic beamforming, and noise source localisation. The body of a spherical array is usually considered perfectly rigid. A sound field captured by the sensors on spherical array can be decomposed into a series of spherical harmonics. In noise source localisation, the amplitude density of sound sources is estimated and illustrated by mean of colour maps. In this work, a rigid spherical array covered by fibrous materials is studied via numerical simulation and the performance of the spherical beamforming is discussed.