传输函数和平面波入射角对合成声场的影响

Influence of Transfer Function and Plane Wave Incidence Angle on Synthesized Sound Field

传输函数中的瞬逝部分和平面波入射角会影响合成平面波声场的性能。本文通过在波数域使用矩形窗修改传输函数,消除合成声场中的瞬逝声场。在平面波频率和离散次源间隔一定时,利用合成声场抗混叠的条件,分析加窗后的传输函数和平面波入射角对合成平面波声场的影响。仿真结果表明,当给定的平面波入射角使抗混叠频率大于平面波频率时,修改的传输函数可以提高合成平面波声场的性能。

The performance of synthesized plane wave sound field is affected by the evanescent contribution of the transfer function and incidence angle of plane wave. In this paper, transfer function is modified by using the rectangular window in wave number domain to eliminate the evanescent sound field. With fixed plane wave incidence angle and spatial sampling interval of secondary sources, the influence of windowed transfer function and plane wave incidence angle on synthesized plane wave sound field are analyzed under the anti-aliasing condition. Simulation results demonstrate that the modified transfer function can improve the performance of the synthesized plane wave sound field when the plane wave frequency is smaller than anti-aliasing frequency for a given plane wave incidence angle.