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《Journal of Applied Acoustics》 2020-02
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On the beamforming of a compact dual-speaker sound system

ZHU Hongyi;SHEN Yuchen;SHEN Yong;Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University;  
Spatial impression enhancement of compact loudspeaker systems is an important problem faced by portable mobile electroacoustic equipment at present. Based on the idea of broadening the apparent source width(ASW) to enhance the spatial impression, this paper studies the beamforming of a compact loudspeaker system. Based on the acoustic characteristics of the cylindrical rigid baffle, a compact dual-speaker sound system is designed by using two loudspeakers. The left/right channel beamforming is realized by using phasealigned minimum mean squared error(MMSE) algorithm, and the phantom center channel beamforming is realized by using MMSE algorithm and designing a half-space directional target. By analyzing the beamwidth and the operating state of loudspeakers, it is verified that the beamforming effect is in accordance with the target design. Considering the actual application, this paper uses the boundary element method to simulate and analyze the influence of the finite-length baffle on the directivity of loudspeaker and beamforming. The simulation results demonstrate that the finite baffle can widen the directivity of the loudspeaker, which is more conducive to the realization of the target of the sound system. On the other hand, this paper further validates the performance of the algorithm by experimental measurements.
【Fund】: 国家重点研发计划项目(2018YFB1403800)
【CateGory Index】: TN643
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