指向性マイクロホンと境界音場制御を用いた三次元音場再生システムの理論的検討及び数値解析

概要

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Three-dimensional sound field reproduction using directional microphones and wave field synthesis can be used to synthesize wave fronts in a listening area using directional microphones and loudspeakers placed at the boundary of the area; the position of the loudspeakers is the same as that of microphones in this technique. Thus, it is very difficult to construct an audio-visual virtual reality system using this technique because the screen or display of the visual system cannot be placed at the position of loudspeakers. In order to reproduce the 3D sound field of the listening area even when the loudspeakers are not placed at the boundary of the area, this paper proposes a 3D sound field reproduction system using directional microphones and boundary surface control. In the proposed system, the 3D sound field in the listening area can be accurately reproduced even when the loudspeakers are not placed at the boundary of the area by introducing inverse filters based on acoustic transfer functions. Results of a computer simulation show that the proposed system can reproduce the 3D sound field in the listening area more accurately than the conventional system.
2010-06-30