| Comparison of hearing aids over the 20th century. | |
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MedLine Citation:
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PMID: 11132788 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To measure hearing aid performance using circuitry representative of the major eras of technological advancement during the 20th century. DESIGN: Twenty subjects with audiometric profiles consistent with hearing aid candidacy were fit with each of seven hearing aids. No directional microphones were used and binaural benefit was not assessed. Each hearing aid was fit to the strategy or fitting scheme of the era, or that which was intended by the presenting manufacturer. Electroacoustic and/or real ear measures of gain, output, bandwidth, and distortion were obtained. Objective outcome measures assessing speech perception in backgrounds of noise were obtained. Subjective outcome measures of sound quality and ease of listening were obtained in the laboratory and in real life settings. RESULTS: Electroacoustic and real ear measures indicate that gain and bandwidth have increased, and output and distortion have decreased with current electronic aids. Speech perception ability across the different outcome measures showed significantly poorer performance with the body and linear hearing aids when input levels were high; when input levels were low, outcome measures with hearing aids using a dynamic range compression were not negatively affected. At the most adverse signal to noise ratios, none of the hearing aids was shown to be superior. Measured bandwidth did not correlate highly with speech perception ability for any of the objective outcome measures used. For the subjective measures of sound quality done in a blinded manner, no significant differences were found across different listening situations for current hearing aids. CONCLUSIONS: The two most important factors for aided speech perception appear to be the audibility and distortion of the signal. No current compression scheme proved superior with the outcome measures used in this investigation. |
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Authors:
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R A Bentler; M R Duve |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Ear and hearing Volume: 21 ISSN: 0196-0202 ISO Abbreviation: Ear Hear Publication Date: 2000 Dec |
Date Detail:
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Created Date: 2000-12-29 Completed Date: 2001-03-29 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8005585 Medline TA: Ear Hear Country: United States |
Other Details:
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Languages: eng Pagination: 625-39 Citation Subset: IM |
Affiliation:
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Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Equipment Design Hearing Aids* / trends Hearing Loss, Sensorineural / physiopathology, rehabilitation* Humans Middle Aged Speech Discrimination Tests Speech Perception / physiology |
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