2.5D Sound Field Reproduction Using Higher Order Loudspeakers

JIA Maoshen; WANG Wenbei; YANG Ziyu

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2.5D Sound Field Reproduction Using Higher Order Loudspeakers

JIA Maoshen *,WANG Wenbei,YANG Ziyu

School of Electronic Information and Control Engineering, Beijing University of Technology

*Correspondence author

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Funding: National Natural Science Foundation of China （No.No. 61231015, 61201197), Specialized Research Fund for the Doctoral Program of Higher Education of the Peoples Republic of China）

Opened online: 9 October 2015

Accepted by: none

Citation: JIA Maoshen,WANG Wenbei,YANG Ziyu.2.5D Sound Field Reproduction Using Higher Order Loudspeakers[OL]. [ 9 October 2015] http://en.paper.edu.cn/en_releasepaper/content/4656598

Using 3-dimensional (3D) sound sources as secondary sources to 2-dimensional (2D) sound field reproduction, it is termed as 2.5-dimensional (2.5D) sound field reproduction which currently is drawing broad interest in acoustic signal processing. In this paper, we propose a method to reproduce a 2D sound field using a circular array of 3D high order (HO) loudspeakers, which provides a mode matching solution based on 3D wave field translation. Using the spherical addition theorem, we first obtain a spherical harmonics representation of a 2D sound field reproduced by an array of HO loudspeakers. Then, the corresponding relationship between the reproduced sound field and the desired sound field is established by spherical/cylindrical harmonic expansions. Finally, the modal weights of HO loudspeakers are designed by using a least squares method. Simulation results show that the proposed method extends the reproduction region and significantly reduces the required minimum number of loudspeakers over the other referenced methods.

Keywords:2.5D reproduction; sound field; high order loudspeaker; circular loudspeaker array

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