Signal reconstruction of moving sound sources with a fixed microphone array
Signal reconstruction of moving sound sources with a fixed microphone array
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使用固定麦克风阵列对移动声源进行信号重建
DOI：
10.1016/j.ymssp.2018.08.052
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发表时间：
2019-03
影响因子：
8.4
通讯作者：
Xu Liang
中科院分区：
文献类型：
--
作者：
Bi Chuan-Xing;Li Yong-Chang;Zhang Yong-Bin;Zhang Xiao-Zheng;Xu Liang
噪声源的时域信号对机械设备的声学设计具有重要意义。获得源信号的一种可用方式是从由麦克风阵列测量的声学信号重建源信号。然而，当声源运动时，由于多普勒效应的影响，固定麦克风阵列采集的声信号在幅度和频率上会发生畸变，导致重建的声源信号不能反映声源的真实的信息。本文首先提出了一种时域波数域方法来消除被测声信号中的多普勒效应，该方法不需要声源的数目、频率和位置等先验信息。然后将消除多普勒效应后的声信号作为被动时间反演方法的输入，重建源信号。数值仿真和实验结果表明，该方法能有效地消除多普勒效应，即使在源发射瞬态信号的情况下，也能准确地重建源信号。实验还发现，在低信噪比条件下，增大阵列孔径，该方法可以在目标高速运动时稳定工作。
The time-domain signals of noise sources are of great importance to acoustic design of machinery. One available way to obtain source signals is to reconstruct them from the acoustic signals measured by a microphone array. However, when sources are moving, the acoustic signals sampled by a fixed microphone array are distorted in amplitude and frequency due to the Doppler effect, leading to that the reconstructed source signals may not reflect the real information of sources. This paper first presents a time-wavenumber-domain method to eliminate the Doppler effect in the measured acoustic signals, in which noprioriinformation on the number, frequencies and locations of sources is needed. Then the acoustic signals after eliminating the Doppler effect are used as the input of the passive time reversal method to reconstruct source signals. Numerical simulation and experimental results show that the proposed method can effectively eliminate the Doppler effect and accurately reconstruct the source signals even when the sources emit transient signals. It is also found that the proposed method can work stably when the sources are moving at high speeds if increasing the array aperture and in the situation of low signal-to-noise ratio.
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