| Clinical Evaluation of Signal-to-Noise Ratio-Based Noise Reduction in Nucleus® Cochlear Implant Recipients. | |
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MedLine Citation:
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PMID: 21206365 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE:: The aim of this study was to investigate whether a real-time noise reduction algorithm provided speech perception benefit for Cochlear™ Nucleus® cochlear implant recipients in the laboratory. DESIGN:: The noise reduction algorithm attenuated masker-dominated channels. It estimated the signal-to-noise ratio of each channel on a short-term basis from a single microphone input, using a recursive minimum statistics method. In this clinical evaluation, the algorithm was implemented in two programs (noise reduction programs 1 [NR1] and 2 [NR2]), which differed in their level of noise reduction. These programs used advanced combination encoder (ACE™) channel selection and were compared with ACE without noise reduction in 13 experienced cochlear implant subjects. An adaptive speech reception threshold (SRT) test provided the signal-to-noise ratio for 50% sentence intelligibility in three different types of noises: speech-weighted, cocktail party, and street-side city noise. RESULTS:: In all three noise types, mean SRTs for both NR programs were significantly better than those for ACE. The greatest improvement occurred for speech-weighted noise; the SRT benefit over ACE was 1.77 dB for NR1 and 2.14 dB for NR2. There were no significant differences in speech perception scores between the two NR programs. Subjects reported no degradation in sound quality with the experimental programs. CONCLUSIONS:: The noise reduction algorithm was successful in improving sentence perception in speech-weighted noise, as well as in more dynamic types of background noise. The algorithm is currently being trialed in a behind-the-ear processor for take-home use. |
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Authors:
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Pam W Dawson; Stefan J Mauger; Adam A Hersbach |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-1-4 |
Journal Detail:
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Title: Ear and hearing Volume: - ISSN: 1538-4667 ISO Abbreviation: - Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-1-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005585 Medline TA: Ear Hear Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1The HEARing Cooperative Research Centre, and 2Cochlear Limited, Melbourne, Victoria, Australia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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