Study of Spherical Near-Field Acoustic Holography with Rigid Spherical Microphone Array
The aim of this paper is to investigate the impacts of various parameters of rigid spherical microphone array in detecting and locating interior sound source.Helmholtz Equations are adopted to express the sound field produced by the incident field and scattered field.The gradient of the pressure is zero at the surface for the sphere is rigid.Both the incident and scattered coefficient could be obtained by solving the Helmholtz Equation using the boundary condition.Then the interior sound field could be detected and located on with the methodology of spherical near-field acoustic holography (SNAH).This study is developed in two aspects,one is configuring the microphone in various distribution in the same sphere radius,and the other one is changing the radius of sphere array.Numerical simulations are carried out to determine the optimum microphone array configuration and structure parameters.One,two,and three sound sources are arranged respectively in different displacement to the sphere center and in different angle direction to simulate the real situation.During the experiments,Omni-directional speakers and beeps are adopted as sound sources.The result shows that the method to detect and locate sound source in interior sound field is valid.
Interior sound field Incident pressure Scattered pressure Rigid spherical microphone array Spherical near-field acoustic holography (SNAH)
QIU Xin-guo LI Ming-zong LU Huan-cai JIANG Wei
Key Laboratory of E&M,Ministry of Education & Zhejiang Province,Zhejiang University of Technology,Hangzhou,310014,China
国际会议
宁波
英文
156-163
2012-11-12（万方平台首次上网日期，不代表论文的发表时间）