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Published in:
2010 | OriginalPaper | Chapter
Use of Bimodal Coherence to Resolve Spectral Indeterminacy in Convolutive BSS
Authors : Qingju Liu, Wenwu Wang, Philip Jackson
Published in: Latent Variable Analysis and Signal Separation
Publisher: Springer Berlin Heidelberg
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Recent studies show that visual information contained in visual speech can be helpful for the performance enhancement of audio-only blind source separation (BSS) algorithms. Such information is exploited through the statistical characterisation of the coherence between the audio and visual speech using, e.g. a Gaussian mixture model (GMM). In this paper, we present two new contributions. An adapted expectation maximization (AEM) algorithm is proposed in the training process to model the audio-visual coherence upon the extracted features. The coherence is exploited to solve the permutation problem in the frequency domain using a new sorting scheme. We test our algorithm on the XM2VTS multimodal database. The experimental results show that our proposed algorithm outperforms traditional audio-only BSS.