A beamforming approach to permutation alignment for multichannel frequency-domain blind speech separation
A beamforming approach to permutation alignment for multichannel frequency-domain blind speech separation
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DOI：
10.1109/icassp.2002.5743880
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
M. Ikram;D. Morgan
中科院分区：
文献类型：
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作者：
M. Ikram;D. Morgan
在这项工作中，我们探讨了盲源分离（BSS）和理想波束形成之间的重要联系。我们首先比较了零导向波束形成器与频域BSS方法在混响环境中的性能，得出了一些有趣的结论。然后，我们研究了使用波束形成概念来解决跨频率排列不一致的可行性，这种不一致会降低BSS方法在混响环境中的性能。我们还提出了一种基于麦克风阵列指向性图信息的排列对齐方案。这种技术的新颖之处在于，即使当指向性模式表现出光栅瓣时，它也能令人满意地工作，实际上，原则上可以实现更好的分离。我们在不同的操作条件和麦克风间距下进行了实验，以支持所提出方法的可行性。
In this work, we explore important connections between blind source separation (BSS) and ideal beamforming. We first compare the performance of a null-steering beamformer against that of a frequency-domain BSS method in a reverberant environment, drawing some interesting conclusions. We then examine the feasibility of using beamformer concepts to resolve permutation inconsistency across frequency, which degrades the performance of BSS methods in a reverberant environment. We also propose a permutation alignment scheme based on information gathered from the microphone array directivity patterns. This technique is novel in the sense that it works satisfactorily even when the directivity patterns exhibit grating lobes, where, in fact, better separation can be achieved in principle. We perform experiments that support the viability of the proposed method under different operating conditions and microphone spacings.