Cochlear Implant Stimulating Strategy Incorporating Current Steering Scheme and Psychoacoustic Model
碩士 === 國立交通大學 === 生醫工程研究所 === 99 === Cochlear implants provide an opportunity for profoundly hearing impaired patients to hear sound again. However, the limited number of electrodes is insufficient to provide enough hearing resolution, and speech comprehension for cochlear implant users under noi...
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| Format: | Others |
| Language: | en_US |
| Published: |
2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/34192942209219289548 |
| Summary: | 碩士 === 國立交通大學 === 生醫工程研究所 === 99 === Cochlear implants provide an opportunity for profoundly hearing impaired patients to hear sound again. However, the limited number of electrodes is insufficient to provide enough hearing resolution, and speech comprehension for cochlear implant users under noisy environment is far worse than normal hearing people.
A vocoder implementation of a novel stimulating strategy for cochlear implants is presented in this study. A multiple-electrodes current steering scheme and psycho-acoustic model were incorporated in this new stimulating strategy for more effective stimulation of the nerve fibers. The primary purpose is to study the hearing performance of a novel hybrid stimulating strategy based on two-electrode or four-electrode current steering scheme. The secondary purpose of this study was to determine if the use of a psychoacoustic model would reduce the number of current steering electrode pair needs to be turned on during a FFT process cycle.
Result of this study shows the new stimulating strategy outperforms the HiRes120 stimulating strategy. It also shows that the new stimulating strategy with psycho-acoustic model maintains the spectral resolution while requiring a significantly fewer numbers of current steering electrode pair turn on.
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