Comput Math Methods Med - A sound processor for cochlear implant using a simple dual path nonlinear model of basilar membrane.

Tópicos

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Resumo

We propose a new active nonlinear model of the frequency response of the basilar membrane in biological cochlea called the simple dual path nonlinear (SDPN) model and a novel sound processing strategy for cochlear implants (CIs) based upon this model. The SDPN model was developed to utilize the advantages of the level-dependent frequency response characteristics of the basilar membrane for robust formant representation under noisy conditions. In comparison to the dual resonance nonlinear model (DRNL) which was previously proposed as an active nonlinear model of the basilar membrane, the SDPN model can reproduce similar level-dependent frequency responses with a much simpler structure and is thus better suited for incorporation into CI sound processors. By the analysis of dominant frequency component, it was confirmed that the formants of speech are more robustly represented after frequency decomposition by the nonlinear filterbank using SDPN, compared to a linear bandpass filter array which is used in conventional strategies. Acoustic simulation and hearing experiments in subjects with normal hearing showed that the proposed strategy results in better syllable recognition under speech-shaped noise compared to the conventional strategy based on fixed linear bandpass filters.

Resumo Limpo

propos new activ nonlinear model frequenc respons basilar membran biolog cochlea call simpl dual path nonlinear sdpn model novel sound process strategi cochlear implant cis base upon model sdpn model develop util advantag leveldepend frequenc respons characterist basilar membran robust formant represent noisi condit comparison dual reson nonlinear model drnl previous propos activ nonlinear model basilar membran sdpn model can reproduc similar leveldepend frequenc respons much simpler structur thus better suit incorpor ci sound processor analysi domin frequenc compon confirm formant speech robust repres frequenc decomposit nonlinear filterbank use sdpn compar linear bandpass filter array use convent strategi acoust simul hear experi subject normal hear show propos strategi result better syllabl recognit speechshap nois compar convent strategi base fix linear bandpass filter

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