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《Acta Electronica Sinica》 2017-03
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2.5D Near-Field Sound Source Synthesis Using Higher Order Ambisonics

ZHOU Ling-song;BAO Chang-chun;JIA Mao-shen;BU Bing;School of Electronic Information and Control Engineering,Beijing University of Technology;  
In the spatial acoustic signal processing,for the issue of dimensionality mismatch between 2-dimensional( 2D) sound field synthesis and practical sound source,and the issue of near-field distortion in the near-field sound source synthesis,this paper presents a 2. 5-dimensional( 2. 5D) sound field synthesis method and a modified Wiener filter method for near-field compensation. The 2. 5D sound field synthesis is achieved using the spherical harmonics expansion of higher order ambisonics( HOA). The modified Wiener filter is used to compensate the near-field distortion which arises when HOA is utilized to reproduce a 2. 5D near-field sound source. Based on the concept of continuous loudspeaker array hypothesis,a general expression of the loudspeaker driving signal is derived. The experiments showthat the proposed method reduced the relative error of the synthesized 2. 5D near-field from 0. 23 to 0. 031 in comparison with the cosine regularization method. Meanwhile,the proposed method provides a larger effective listening area compared with the high-pass filter method.
【Fund】: 国家自然科学基金(No.61231015 No.61201197);; 教育部博士点新教师基金(No.20121103120017);; 北京市教委科技计划(No.KM201310005008)
【CateGory Index】: TN912.3;TN643
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