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Convolutive blind signal separation with post-processing

Convolutive blind signal separation with post-processing
Convolutive blind signal separation with post-processing
A new subband based speech enhancement scheme is presented. It integrates spatial and temporal signal processing methods to enhance speech signals in a noisy environment. The approach makes use of the popular blind signal separation (BSS) to spatially separate the target signal from the interference. Due to the multipath/reverberant environment, BSS has its fundamental limitation in its separation quality. To overcome that, an adaptive noise canceller (ANC) is employed to perform further interference reduction. The reference for the ANC in this case is simply the interference dominant output from the BSS. A higher order statistical method is proposed for the selection of the reference signal. This post processing acts as a spectral decorrelator and experimental results show that even in under-determined (more sources than elements) case, the structure offers impressive enhancement capability. Further, a remarkable improvement in recognition rate is registered when tested in automatic speech recognition (ASR)
539-548
Low, S.Y.
8fd903a4-b0b0-4c1c-9cc7-c2fe87109376
Nordholm, S.
d2441721-2cf0-4387-a95d-7cd2b956c014
Togneri, R.
9866b477-ded9-4447-b287-45c9fdc3a9d7
Low, S.Y.
8fd903a4-b0b0-4c1c-9cc7-c2fe87109376
Nordholm, S.
d2441721-2cf0-4387-a95d-7cd2b956c014
Togneri, R.
9866b477-ded9-4447-b287-45c9fdc3a9d7

Low, S.Y., Nordholm, S. and Togneri, R. (2004) Convolutive blind signal separation with post-processing. IEEE Transactions on Speech and Audio Processing, 12 (5), 539-548. (doi:10.1109/TSA.2004.832993).

Record type: Article

Abstract

A new subband based speech enhancement scheme is presented. It integrates spatial and temporal signal processing methods to enhance speech signals in a noisy environment. The approach makes use of the popular blind signal separation (BSS) to spatially separate the target signal from the interference. Due to the multipath/reverberant environment, BSS has its fundamental limitation in its separation quality. To overcome that, an adaptive noise canceller (ANC) is employed to perform further interference reduction. The reference for the ANC in this case is simply the interference dominant output from the BSS. A higher order statistical method is proposed for the selection of the reference signal. This post processing acts as a spectral decorrelator and experimental results show that even in under-determined (more sources than elements) case, the structure offers impressive enhancement capability. Further, a remarkable improvement in recognition rate is registered when tested in automatic speech recognition (ASR)

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Published date: September 2004
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 369132
URI: https://eprints.soton.ac.uk/id/eprint/369132
PURE UUID: 7ef8813b-05ea-47f3-9880-e11297fbb528

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Date deposited: 09 Oct 2014 09:11
Last modified: 15 Jul 2019 21:44

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