Separation of nonstationary sound fields in the time-wavenumber domain.
Separation of nonstationary sound fields in the time-wavenumber domain.
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DOI：
10.1121/1.3683249
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Xiao-Zheng Zhang;Jean-Hugh Thomas;C. Bi;J. Pascal
中科院分区：
文献类型：
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作者：
Xiao-Zheng Zhang;Jean-Hugh Thomas;C. Bi;J. Pascal
为了不同的目的，已经提出了许多声场分离技术。然而，这些技术仅考虑空间域中的声场分离，并且仅限于稳态声场。当声场为非平稳时，也需要在时域进行分离。基于声压在时间-波数域中的传播原理，提出了一种两个相邻平行测量面的非平稳声场分离技术。当干扰源位于测量平面的另一侧时，该方法可以在时域和空域上分离出由主源产生的非平稳信号。利用空间傅里叶变换和时域反卷积方法，实现了信号的时、空域分离。对两个单极子在非平稳信号驱动下的仿真表明，该方法可以在时域和空域上消除干扰源的影响。通过将两个扬声器分别置于测量平面两侧的实验，验证了该方法的可行性。此外，为了更客观地评价分离效果，还计算了模拟和实验中的一些指标。
A number of sound field separation techniques have been proposed for different purposes. However, these techniques just consider the separation of sound fields in the space domain and are restricted to stationary sound fields. When the sound fields are nonstationary, it is also necessary to perform the separation in the time domain. Therefore, on the basis of the propagation principle of sound pressure in the time-wavenumber domain, a nonstationary sound field separation technique with two closely spaced parallel measurement surfaces is proposed. It can separate the nonstationary signals generated by the primary sources in both time and space domains when the disturbing sources exist on the other side of the measurement plane. The signals in time and space domains are separated by using the spatial Fourier transform method and the time domain deconvolution method. A simulation involving two monopoles driven by nonstationary signals demonstrates that the method proposed can remove the influence of disturbing sources in both time and space domains. The feasibility of this method is also demonstrated by an experiment with two loudspeakers located on two sides of measurement planes. Additionally, to comment more objectively on the separation results, some indicators are computed in both the simulation and experiment.