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Estimation of Active Cochlear Nonlinearity by Multi-Component Distortion-Product Otoacoustic Emissions

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Multi-component distortion-product otoacoustic emissions (DPOAEs) are generated by the nonlinear mechanism of cochlear activity. Recent research on DPOAEs tends to neglect all but the 2f1f2 distortion component leading to a very narrow view of the activity, although the other components may prove to have supplementary value [1, 2, 3]. In fact, the pattern of such multi-component DPOAEs indicates a great deal about cochlear nonlinearity. This paper will demonstrate our approach to estimate the input-output function of the cochlear nonlinearity by the multi-component DPOAEs via introducing generating models of the multi-component DPOAEs. The cochlear nonlinearity for generating multi-component DPOAEs can be modelled by a polynomial power series model and a compressive hyperbolic model. Then the input-output function of the cochlear nonlinearity can be calculated from the multi-component DPOAEs. This input-output function represents the cochlear nonlinearity and will give the same pattern of multi-component DPOAEs as recorded from subjects.

The results suggest that the generating mechanism of the multi-component DPOAEs is level dependent in such a way that, at lower stimulus level, an active cochlear nonlinearity modelled by polynomial power series dominates the generation of the multi-component DPOAEs, it is the compressive hyperbolic model plays role for the cochlear nonlinearity at middle stimulus level, and a linear process is involved at the higher stimulus level.
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Document Type: Research Article

Publication date: September 1, 1999

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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