A Noise Reduction Method Based on a Generalized Subtractive Beamformer

概要

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Combating noise signals is still a very important and challenging research topic. Previously, we presented a subtractive beamformer based noise reduction algorithm using paired microphones, which was shown to be effective in reducing directional noise. However its basic assumption, a perfectly coherent noise field, is generally not fulfilled in real-world environments. In this paper, we develop a general expression for the original algorithm we suggested earlier, based on a generalized subtractive beamformer and by relaxing the strict assumption to the one of an arbitrary noise field. Following the ideas similar to those of the original algorithm, the generalized algorithm, with a generalized sidelobe canceller (GSC) like structure, is derived. The theoretical analysis is then presented to show the linkage between this generalized algorithm and the original one, and to show its noise reduction performance in theoretically defined noise fields. Finally, the superiority of the proposed noise reduction algorithm with regard to other comparative algorithms was verified by experiments using multi-channel noise recordings.
社団法人電子情報通信学会の論文
2005-08-12