Tech report on speech segregation

[DeLiang Wang <dwang@xxxxxxxxxxxxxxxxxx>]

The following technical report is available via FTP/WWW:

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"Separation of Speech from Interfering Sounds
Based on Oscillatory Correlation"

Technical Report #24, June 1998
The Ohio State University Center for Cognitive Science
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        DeLiang L. Wang, The Ohio State University
        Guy J. Brown, University of Sheffield

A multi-stage neural model is proposed for an auditory scene analysis task -
segregating speech from interfering sound sources. The core of the model is
a two-layer oscillator network that performs stream segregation on the basis
of oscillatory correlation. In the oscillatory correlation framework,
a stream is represented by a population of synchronized relaxation
oscillators, each of which corresponds to an auditory feature, and different
streams are represented by desynchronized oscillator populations. Lateral
connections between oscillators encode harmonicity, and proximity in
frequency and time. Prior to the oscillator network are a model of the
auditory periphery and a stage in which mid-level auditory representations
are formed. The model has been systematically evaluated using a corpus of
voiced speech mixed with interfering sounds, and produces improvements in
terms of signal-to-noise ratio for every mixture. Furthermore, the
pattern of improvements seems consistent with human performance. The
performance of our model is compared with other studies on computational
auditory scene analysis. A number of issues including biological plausibility
and real-time implementation are also discussed.

(28 pages, 384 KB compressed)


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        Directory: /pub/leon/Brown
        Filename: ccs98.ps.gz

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