A Speech Processor for Cochlear Implant using a Simple Dual Path Nonlinear Model of Basilar Membrane

K. H. Kim, S. J. Choi, J. H. Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We present a novel speech processing strategy for cochlear implant (CI) based on active nonlinear characteristics of biological cochlea that contribute to hearing under noisy conditions. A simple dual path nonlinear model (SDPN) was developed to utilize the advantage of leveldependent frequency response characteristics in robust formant representation. The model was motivated from the function of basilar membrane so that leveldependent frequency response can be reproduced. Compared to dual resonance nonlinear model (DRNL) which has been proposed as an active nonlinear model of basilar membrane, the proposed model is much simpler and thus better suited to be incorporated in CI speech processor. We developed a CI speech processing strategy based on the SDPN for frequency decomposition and an adaptive envelope detector. It was verified from spectral analysis that the formants of speech is robustly represented after the frequency decomposition by the array of SDPN, compared to a linear bandpass filter array of conventional strategies. From acoustic simulation and hearing experiments on normal subjects, it was verified that the proposed strategy yielded enhanced syllable recognition under speechshaped noise than the conventional strategy.

Original languageEnglish
Title of host publication13th International Conference on Biomedical Engineering - ICBME 2008
Pages257-260
Number of pages4
DOIs
Publication statusPublished - 2009
Event13th International Conference on Biomedical Engineering, ICBME 2008 - , Singapore
Duration: 2008 Dec 32008 Dec 6

Publication series

NameIFMBE Proceedings
Volume23
ISSN (Print)1680-0737

Other

Other13th International Conference on Biomedical Engineering, ICBME 2008
CountrySingapore
Period08/12/308/12/6

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomedical Engineering

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    Kim, K. H., Choi, S. J., & Kim, J. H. (2009). A Speech Processor for Cochlear Implant using a Simple Dual Path Nonlinear Model of Basilar Membrane. In 13th International Conference on Biomedical Engineering - ICBME 2008 (pp. 257-260). (IFMBE Proceedings; Vol. 23). https://doi.org/10.1007/978-3-540-92841-6_62