| Current steering and results from novel speech coding strategies. | |
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MedLine Citation:
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PMID: 18223448 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Advanced Bionics' cochlear implants have independent current sources that can share stimulation current between 2 contacts (Current Steering). By stimulating 2 adjacent electrodes with different weights, different pitches can be evoked, allowing to increase the number of processing channels. STUDY DESIGN: A counterbalanced crossover design was used to compare 3 different current steering implementations to the clinical HiRes strategy. SETTING: The study was a prospective, within-subject, repeated-measure experiment. PATIENTS: The study group consisted of 8 postlingually deaf subjects with a minimum of 12-month experience in HiRes. INTERVENTION: The following programs were evaluated: 1) a Fast Fourier Transformation (FFT)-based current steering implementation with 120 stimulation sites; 2) the same current steering implementation but with 16,000 stimulation sites; and 3) a current steering implementation based on a sinusoidal decomposition of the original signal with 16,000 stimulation sites. MAIN OUTCOME MEASURES: Speech perception tests in quiet and in Comité Consultatif International Télégraphique et Téléphonique (CCITT) noise, as well as with competing talker; an adaptive test of the frequency difference limen; a Quality Assessment Questionnaire. RESULTS: Current results do not show any improvement in speech perception for a certain current steering strategy compared with HiRes. However, when selecting the optimal current steering strategy, subjects could achieve a significant benefit compared with the clinical HiRes. In addition, the frequency difference limen could be reduced significantly at 1,280 Hz. CONCLUSION: Current steering seems to have the potential to improve both understanding in adverse listening situations and frequency resolution. However, the optimal implementation needs further investigation. |
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Authors:
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Andreas Buechner; Martina Brendel; Beate Krüeger; Carolin Frohne-Büchner; Waldo Nogueira; Bernd Edler; Thomas Lenarz |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology Volume: 29 ISSN: 1531-7129 ISO Abbreviation: Otol. Neurotol. Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-01-28 Completed Date: 2008-03-31 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100961504 Medline TA: Otol Neurotol Country: United States |
Other Details:
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Languages: eng Pagination: 203-7 Citation Subset: IM |
Affiliation:
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Department of Otolaryngology, Medical University of Hannover, Hannover, Germany. buechner@hoerzentrum-hannover.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Algorithms Cochlear Implants* Cross-Over Studies Deafness / psychology, therapy* Electrodes, Implanted Female Fourier Analysis Humans Male Middle Aged Models, Statistical Pitch Perception Prospective Studies Prosthesis Design* Speech Perception / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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