提高麦克风阵列波束指向性能的虚拟扩展方法

doi:10.3969/j.issn.1001-2400.2016.02.020

Abstract

Abstract:

For the broadband microphone array, how to maintain the consistency of optimal array processing in the whole frequency band is the key problem, so an efficient virtual array extending method is put forward. This method is not only suitable for the single source scenarios, but also suitable for the multi signal source scene. Therein, from the signal model and the theoretical derivation, the problem which is caused by array virtual extending is analyzed deeply, such as array error and difficulty of its realization, then a robust method based on diagonal loading is proposed, and the method of how to select the load level is also given. Finally, the processing performance of the proposed virtual array extension method is tested and verified by theoretical analysis and detailed simulation results, and the conclusion is obtained that virtual array extension can improve the adaptive beamformer performance effectively. The proposed method is not only used for the uniform linear array, but also can be applied to the adaptive array with an arbitrary configuration.

Key words: microphone array, array virtual extend, diagonal loading, adaptive beamforming

YANG Jie;LIU Congfeng;CAI Xiao. Improved steering based on the virtual extend method for the microphone array[J].Journal of Xidian University, 2016, 43(2): 114-119.

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Improved steering based on the virtual extend method for the microphone array

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