| Wind noise in hearing aids: II. Effect of microphone directivity. | |
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MedLine Citation:
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PMID: 22111542 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Abstract Objectives: The objectives were: (1) to examine the effects of a directional microphone with different directivity patterns and different microphone combinations on wind noise levels at the hearing aid output; and (2) to derive strategies appropriate for hearing aid selection and future designs. Design: The in-situ frequency responses of a behind-the-ear hearing aid (BTE1) were matched when the hearing aid was programmed to dipole, hypercardioid, cardioids, or adaptive microphone mode. The in-situ frequency responses of another hearing aid (BTE2) were matched among an omnidirectional microphone (OMNI), an adaptive directional microphone (ADM), and a combination of an omnidirectional microphone at low frequencies and an adaptive directional microphone at high frequencies (MIXED). Flow noise was recorded at flow velocities of 0, 4.5, 9.0, and 13.5 m/s. Measurements were repeated for the hypercardioid pattern of BTE1. Study sample: Flow noise recorded using directional microphones with four directivity patterns and using OMNI, ADM, and MIXED. Results: Directional microphones with different directivity patterns generated similar flow noise levels. ADM yielded higher overall levels than OMNI and MIXED, which had similar overall levels. Conclusions: The adaptive directional microphone is the most versatile microphone for use in wind. The mixed microphone mode is a viable wind noise reduction option. Sumario Objetivos: Los objetivos fueron: (1) examinar los efectos del micrófono direccional con diferentes patrones de dirección y diferentes combinaciones en el micrófono para niveles de ruido del viento y de salida del auxiliar auditivo, y (2) derivar estrategias apropiadas para la selección del auxiliar auditivo y diseños futuros. Diseño: Las respuestas de frecuencia in-situ de un auxiliar auditivo retroauricular (BTE1) fueron pareadas cuando éste se programó con modos de micrófono adaptado, cardioide e hipercardioide. Los respuesta de frecuencia in-situ de otro auxiliar auditivo (BTE2) fueron pareadas con micrófono direccional (OMNI), micrófono direccional adaptado (ADM), y con la combinaci n de micrófono omnidireccional a bajas frecuencias y micrófono direccional adaptado a altas frecuencias (MIXED). El flujo de ruido fue registrado a velocidades de flujo de 0, 4.5, 9.0, y 13.5 m/s. Las mediciones se repitieron para el patrón hipercardioide del BTE1. Muestra del Estudio: Flujo de ruido registrado usando micrófonos direccionales con cuatro patrones de dirección y usando OMNI, ADM, y MIXED. Resultados: Los micrófonos direccionales con diferentes patrones de dirección generaron flujos similares de ruido. ADM produjo niveles globales m s altos que el OMNI y el MIXED, que tuvieron niveles globales similares. Conclusiones: El micrófono direccional adaptado es el micrófono más versátil para utilizar en presencia de viento. El modo de micrófono mixto es una opción viable de reducción del ruido del viento. |
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Authors:
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King Chung |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-23 |
Journal Detail:
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Title: International journal of audiology Volume: - ISSN: 1708-8186 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-24 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 Allied Health and Communication Disorders, Northern Illinois University , DeKalb, Illinois , USA . E-mail: kchung@niu.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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