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A composite model of the auditory periphery for simulating responses to complex sounds
1CIRC Group, Swiss Federal Institute of Technology-Lausanne, Switzerland. Arnaud.Robert@epfl.ch
The Journal of the Acoustical Society of America
|October 26, 1999
Summary
This study introduces a new phenomenological cochlear model using all-pole gamma-tone filters (APGF) and active feedback. The model accurately simulates cochlear nonlinearities like compression and suppression for improved auditory research and hearing aid development.
Area of Science:
- Auditory Neuroscience
- Biomedical Engineering
- Signal Processing
Background:
- The cochlea's complex mechanics are challenging to model.
- Existing models often lack simplicity or fail to capture nonlinearities.
- Understanding cochlear function is crucial for hearing research.
Purpose of the Study:
- To present a phenomenological model of the cochlea.
- To incorporate nonlinear properties and active feedback mechanisms.
- To simulate key cochlear phenomena accurately.
Main Methods:
- Utilized a bank of nonlinear time-varying parallel filters, specifically the all-pole gamma-tone filter (APGF).
- Implemented an active distributed feedback system based on outer hair cell (OHC) functioning.
- Modeled nonlinear properties to mimic cochlear responses to complex stimuli.
Main Results:
- The APGF provided realistic filter shapes and simplified implementation.
- The model successfully reproduced phenomena like compression and two-tone suppression.
- Active feedback effectively modeled both low-side and high-side suppression.
Conclusions:
- The developed cochlear model offers a robust and simplified approach.
- It accurately simulates essential cochlear nonlinear behaviors.
- Applications include auditory signal coding, hearing aid design, and neural modeling.