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A time-domain digital simulation of hearing aid response
1Center for Research in the Speech and Hearing Sciences, City University of New York, Graduate School, NY 10036.
Journal of Rehabilitation Research and Development
|January 1, 1990
Summary
A new time-domain digital hearing aid simulation models linear and nonlinear effects. This digital simulation accurately replicates hearing aid acoustics and processing, including compression and distortion.
Area of Science:
- Audiology
- Digital Signal Processing
- Acoustics
Background:
- Hearing aid simulations are crucial for design and testing.
- Existing models often focus on linear aspects or frequency-domain analysis.
- Accurate modeling of nonlinearities is essential for understanding modern hearing aid performance.
Purpose of the Study:
- To develop a time-domain digital simulation for in-the-ear (ITE) hearing aids.
- To incorporate nonlinear effects like compression and amplifier distortion into the simulation.
- To provide a comprehensive tool for analyzing hearing aid performance.
Main Methods:
- Developed a time-domain digital simulation incorporating key hearing aid components.
- Modeled linear processing, acoustics, two-channel compression, and amplifier clipping distortion.
- Included microphone, receiver, ear canal, eardrum, and vent transmission (feedback and direct sound).
Main Results:
- Simulation results for linear hearing aids align with established frequency-domain models.
- Successfully demonstrated the modeling of nonlinear effects, including compression and distortion.
- Provided examples of responses for both linear and nonlinear hearing aid systems.
Conclusions:
- The developed time-domain simulation effectively models ITE hearing aids.
- The simulation accurately captures both linear and nonlinear acoustic and processing behaviors.
- This tool offers a valuable method for analyzing complex hearing aid functionalities.