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Modeling
the precedence effect for speech.
O. Schwartz, J.G. Harris, and J.C. Principe.
Published in:
Computational Neuroscience
Trends
in Research, Volume 4, Pages 819-826, 1998.
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The
ability of the human auditory system to localize the direction of a
sound source in a reverberant environment extends from simple clicks
to complex speech signals. The perceived location of the auditory event
is dominated by the direct sound, for small enough time intervals between
the direct sound and reflection--a phenomenon known as the precedence
effect. In this paper we present a computer simulation of the precedence
effect for speech, implemented using Matlab and tested on speech signals
from the TIMIT database. The model is based on the biological assumption
that the rate of onset of a signal is critical in triggering the precedence
effect. The model demonstrates the precedence effect on speech signals,
as opposed to prior models that have only been tested on clicks. In
addition, a novel onset detection method is described and implemented,
based on adaptive prediction. The adaptive method is promising in its
ability to enhance onsets and to reduce the steady state portions of
the signal.
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