Moving microphone arrays to reduce spatial aliasing in the beamforming technique: Theoretical background and numerical investigation

被引:29
作者
Cigada, Alfredo [1 ]
Lurati, Massimiliano [1 ]
Ripamonti, Francesco [1 ]
Vanali, Marcello [1 ]
机构
[1] Politecn Milan, Dept Mech Engn, I-20156 Milan, Italy
关键词
D O I
10.1121/1.2998778
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This paper introduces a measurement technique aimed at reducing or possibly eliminating the spatial aliasing problem in the beamforming technique. Beamforming main disadvantages are a poor spatial resolution, at low frequency, and the spatial aliasing problem, at higher frequency, leading to the identification of false sources. The idea is to move the microphone array during the measurement operation. In this paper, the proposed approach is theoretically and numerically investigated by means of simple sound propagation models, proving its efficiency in reducing the spatial aliasing. A number of different array configurations are numerically investigated together with the most important parameters governing this measurement technique. A set of numerical results concerning the case of a planar rotating array is shown, together with a first experimental validation of the method. (C) 2008 Acoustical Society of America. [DOI: 10.1121/1.2998778]
引用
收藏
页码:3648 / 3658
页数:11
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