| A method to measure hearing aid directivity index and polar pattern in small and reverberant enclosures. | |
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MedLine Citation:
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PMID: 21309640 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Abstract Objective: The directivity index (DI) and polar pattern of directional hearing aids are typically measured in an anechoic chamber, which is expensive and not commonly found. This article proposes a quasi-anechoic technique to measure hearing aid directivity in small and reverberant enclosures using the root-mean-square amplitude of the first 3 ms of the hearing aid?s response to the input signal. Design: The hearing aid?s planar DI and polar pattern were measured using the proposed method in an audiologic booth with low reverberation, a room with moderate reverberation, and an anechoic chamber. The measurement was repeated four times for each aid in each environment. The results were compared to the directivity obtained in the anechoic chamber using two benchmark measurements. Study Sample: Eight hearing aids with a fixed directional mode were tested. Results and Conclusions: The results revealed that the error of the proposed method in DI was smaller than 0.3 dB in 94% of the measurement conditions. The standard deviation of the DI was smaller than 0.1 dB in 94% of the conditions. These results suggest that the proposed quasi-anechoic method provides an accurate and repeatable way to assess non-adaptive directional microphone hearing aids in small non-anechoic enclosures. Sumario Objetivo: T?picamente el ?ndice de direccionalidad (DI) y el patr?n polar de los auxiliares auditivos direccionales son medidos en una c?mara anecoica, que generalmente es costosa y dif?cil de encontrar. Este art?culo propone una t?cnica quasi anecoica para medir la direccionalidad en un recinto peque?o y reverberante, utilizando el promedio de la ra?z cuadrada de la amplitud de los tres primeros mili-segundos de la respuesta de los auxiliares auditivos ante la se?al de entrada. Dise?o: El patr?n plano DI y el polar de los auxiliares auditivos fueron medidos utilizando el m?todo propuesto en una cabina audiol?gica con baja reverberaci?n, en un cuarto con moderada reverberaci?n y en una c?mara anecoica. Se repitieron las mediciones cuatro veces para cada auxiliar en cada condici?n ambiental. Se compararon los resultados con la direccionalidad obtenida en la c?mara anecoica utilizando dos mediciones de referencia. Muestra: Se evaluaron ocho auxiliares auditivos en el modo de direccionalidad fija. Resultados Y Conclusiones: Los resultados revelaron que el error del m?todo propuesto en DI fue menor a 0.3 dB en el 94% de las condiciones medidas. La desviaci?n est?ndar del DI fue menor a 0.3dB en 94% de las condiciones de medici?n. Estos resultados sugieren que el m?todo quasi anecoico propuesto proporciona una forma certera y repetible para evaluar auxiliares auditivos con micr?fonos no adaptativos en un recinto no anecoico. |
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Authors:
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Yu-Hsiang Wu; Ruth A Bentler |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-10 |
Journal Detail:
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Title: International journal of audiology Volume: - ISSN: 1708-8186 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101140017 Medline TA: Int J Audiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Communication Sciences and Disorders, The University of Iowa, Iowa City, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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