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KMID : 1137820080290010025
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의공학회지
2008 Volume.29 No. 1 p.25 ~ p.31
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Comparison of Speech Onset Detection Characteristics of Adaptation Algorithms for Cochlear Implant Speech Processor
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Choi Sung-Jin
Kim Jin-Ho
Kim Kyung-Hwan
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Abstract
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It is well known that temporal information, i.e speech onset, about input speech can be represented to the response nerve signal of auditory nerve better depending on the adaptation effect occurred in the auditory nerve synapse. In addition, the performance of a speech processor of cochlear implant can be improved by the adaptation effect. In this paper, we observed the emphasis characteristic of speech onset in the recently proposed adaptation algorithm, analyzed the characteristic of performance change according to the variation of parameters and compared with transient emphasis spectral maxima (TESM) is the previous typical strategy. When observing false peaks which are generated everywhere except speech onset, in the case of the proposed model, the false peak were generated much less than in the case of the TESM and it is more distinguishable under noise.
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KEYWORD
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cochlear Implant, speech processor, auditory nerve, adaptation effect, speech onset
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