Implementation of a Nonlinear Wave-Digital-Filter Cochlear Model
Research on the physiology of hearing over the past decade strongly suggests that wave propagation in the cochlea is affected by an active nonlinear regeneration mechanism. One published nonlinear cochlear modeling study (Deng and Geisler, 1987) presents results (Figure 9 of the reference) linking the nonlinearity to an apparent enhancement of speech sounds in broadband noise, in comparison to equivalent results without the nonlinearity. If such an effect can be verified and understood in general terms, it would be of significant value for improving intelligibility in speech recognition and in aids to the deaf, and perhaps for other signal recovery applications as well.
KeywordsOuter Hair Cell Basilar Membrane Tectorial Membrane Analog Network Network Section
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