| Factors affecting the use of noise-band vocoders as acoustic models for pitch perception in cochlear implants. | |
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MedLine Citation:
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PMID: 16454303 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Although in a number of experiments noise-band vocoders have been shown to provide acoustic models for speech perception in cochlear implants (CI), the present study assesses in four experiments whether and under what limitations noise-band vocoders can be used as an acoustic model for pitch perception in CI. The first two experiments examine the effect of spectral smearing on simulated electrode discrimination and fundamental frequency (FO) discrimination. The third experiment assesses the effect of spectral mismatch in an FO-discrimination task with two different vocoders. The fourth experiment investigates the effect of amplitude compression on modulation rate discrimination. For each experiment, the results obtained from normal-hearing subjects presented with vocoded stimuli are compared to results obtained directly from CI recipients. The results show that place pitch sensitivity drops with increased spectral smearing and that place pitch cues for multi-channel stimuli can adequately be mimicked when the discriminability of adjacent channels is adjusted by varying the spectral slopes to match that of CI subjects. The results also indicate that temporal pitch sensitivity is limited for noise-band carriers with low center frequencies and that the absence of a compression function in the vocoder might alter the saliency of the temporal pitch cues. |
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Authors:
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Johan Laneau; Marc Moonen; Jan Wouters |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 119 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2006-02-03 Completed Date: 2007-01-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 491-506 Citation Subset: IM |
Affiliation:
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Laboratory for Experimental ORL, K.U.Leuven, Kapucijnenvoer 33, B 3000 Leuven, Belgium. johan.laneau@philips.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Adult Analysis of Variance Case-Control Studies Cochlear Implants* Female Humans Male Middle Aged Models, Biological* Noise Pitch Discrimination / physiology* Psychometrics Time Factors Time Perception / physiology |
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