Biological Basis of Hearing-Aid Design |
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Authors: | Murray B. Sachs Ian C. Bruce Roger L. Miller Eric D. Young |
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Affiliation: | (1) Center for Hearing Sciences and Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD;(2) Hearing Research Laboratories, Division of Otolaryngology—Head and Neck Surgery, Department of Surgery, Duke University Medical Center, Durham, NC |
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Abstract: | We show that we can accurately model the auditory-nerve discharge patterns in response to sounds as complex as speech and ask how we may exploit this knowledge to test new strategies for hearing-aid signal processing. We describe the auditory-nerve representations of vowels in normal and noise-damaged ears. The normal representations are predicted well by a cochlear signal processing model originally developed by Carney (Carney, L. H. J. Acoust. Soc. Am. 93:401–417, 1993). Basilar-membrane tuning is represented by a time-varying narrow-band filter. Outer hair cell control of tuning is exerted by a nonlinear feedback path. We show that the effects of noise-induced outer hair cell damage can be modeled by scaling the feedback signal appropriately and use the model to test one strategy for hearing-aid speech processing. We conclude by discussing some aspects of future trends in biomedical engineering approaches to problems of hearing impairment. © 2002 Biomedical Engineering Society.PAC2002: 4350-x, 4364Dw, 8780Xa, 4360Bf, 4366Ts, 8719La, 8710+e, 8717Aa, 8716Xa |
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Keywords: | Cochlear models Hearing impairment Basilar membrane Auditory nerve Hearing aids |
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