Page 101 - 《应用声学》2021年第6期

第 40 卷 第 6 期 Vol. 40, No. 6
2021 年 11 月 Journal of Applied Acoustics November, 2021

⋄ 研究报告 ⋄

基于脉冲声分离的刚性球散射声控制

王 冉 1,2 王晓琳 1† 杨 军 1,2

(1 中国科学院声学研究所 北京 100190)
(2 中国科学院大学 北京 100049)
摘要：提出了一种基于脉冲声的三维空间中刚性球散射声分离方法，并利用前馈、固定系数控制方式对分离出
的散射声进行有源控制，抑制散射声强度，实现了刚性球散射体在观测点处 “声学不可见”。该方法利用脉冲信
号作为初级噪声，通过有无刚性球时传声器采集脉冲信号的差值确定散射声大小，实现散射声与声源直达声
的分离。对分离出的散射声进行多通道有源控制以验证该文所提分离方法及控制系统的有效性。实验结果表
明，700 ∼ 1000 Hz 范围内，有源控制开启后，双通道散射声的平均降噪量大于 5 dB，多通道散射声的平均降
噪量大于 8 dB，且误差传声器处采集的残余声场与无刚性球时采集的初级声场信号波形基本一致，实现了刚
性球散射体在误差传声器处 “声学不可见”。此外，参考传声器布放位置的选取问题也在该文做了详细讨论。
关键词：有源噪声控制；前馈控制；散射声场
中图法分类号: TB53 文献标识码: A 文章编号: 1000-310X(2021)06-0897-07
DOI: 10.11684/j.issn.1000-310X.2021.06.012

Active noise control for the scattered sound of rigid sphere based on the
impulsive signal separation method

WANG Ran 1,2 WANG Xiaolin 1 YANG Jun 1,2

(1 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(2 University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: A method for the rigid sphere scattered sound field separation in three-dimensional space based on
the impulsive signal is proposed. And the scattered sound pressure is further used as error signal in the active
noise control (ANC) system where feedforward and fixed-coefficient filter is adopted. Therefore, the scattered
sound pressure is suppressed and it realizes the rigid sphere invisible at the error point. In this work, the
impulsive signal is adopted as the primary source, and the scattered sound pressure is acquired via the sound
pressure difference of the microphone with and without the sphere existence. Then the active noise control is
implemented to suppress the scattered sound pressure to verify the effectiveness of the proposed scattered sound
field separation method and the ANC system. The experimental results show that in the range of 700–1000 Hz,
the average noise reduction at the error point is more than 5 dB and 8 dB with two-channel and multi-channel
ANC system. And after the active noise control is on, the residual sound pressure and the primary sound
pressure at the error point are basically the same which confirms the scattered sound pressure is suppressed
and the rigid sphere is invisible at the error point. In addition, the location of the reference microphone is also
discussed in the paper.
Keywords: Active noise control; Feedforward control; Scattered sound field

2021-02-26 收稿; 2021-04-09 定稿
作者简介: 王冉 (1994– ), 女, 北京人, 博士研究生, 研究方向: 有源噪声控制。
† 通信作者 E-mail: wangxiaolin@mail.ioa.ac.cn