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A hardware cochlear nonlinear preprocessing model with active feedback.

E Zwicker

    The Journal of the Acoustical Society of America
    |July 1, 1986
    PubMed
    Summary
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    This study presents a 90-section hardware model simulating the inner ear's nonlinear preprocessing. The model accurately replicates physiological and psychoacoustical effects, including frequency and phase responses.

    Area of Science:

    • Auditory Neuroscience
    • Bioacoustics
    • Computational Auditory Neuroscience

    Background:

    • The inner ear performs complex nonlinear preprocessing crucial for hearing.
    • Outer hair cells amplify mechanical vibrations, while inner hair cells transmit auditory information.
    • Existing models may not fully capture the intricate nonlinear dynamics.

    Purpose of the Study:

    • To describe a novel hardware model of the inner ear's nonlinear preprocessing.
    • To simulate auditory processing across a specific frequency range (900-8000 Hz).
    • To validate the model against known physiological and psychoacoustical data.

    Main Methods:

    • Development of a 90-section hardware model based on Zwicker's assumptions.
    • Incorporation of saturating nonlinear mechanical amplification by outer hair cells.

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  • Simulation of information transfer via inner hair cells to higher auditory centers.

    • Main Results:

    • The model demonstrates close correlation with physiological and psychoacoustical findings.
    • Quantitative data on level-dependent frequency and phase responses were obtained.
    • An example of auditory suppression was successfully outlined within the model.

    Conclusions:

    • The developed hardware model effectively replicates key nonlinear preprocessing functions of the inner ear.
    • The model serves as a valuable tool for studying auditory perception and its underlying mechanisms.
    • Further research can utilize this model to explore various auditory phenomena.