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Original Article

Directivity of Different Hearing Aid Microphone Locations: Directividad De Diferentes Posiciones De Los Micrócute;fonos En Los Auxiliares Auditivos

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Pages 48-56 | Received 08 Jan 2001, Accepted 15 May 2001, Published online: 07 Jul 2009
 

Abstract

In this study, we present a new method to derive a single-number measure of the directivity of hearing aids. The method is an extension of the conventional directivity index (DI), and is called overall directivity index (ODI). The directivities of five different hearing aid styles were compared with that of the open ear. The behind-the-ear (BTE) style showed the lowest directionality compared to the other hearing aid styles and the open ear. There were only minor differences in directivity between any of the four different hearing aid styles placed in the ear and of the open ear canal. The conventional measure of DI is less suitable for hearing aids, because it ignores sound coming from other than the frontal direction. To quantify directionality of a hearing aid in a real-life situation, we suggest the single-number ODI, weighted with the articulation index and related to a listening segment of 0–30±. An application of the data is shown for a BTE with a directional microphone.

Sumario

En este estudio presentamos un nuevo método para derivar una medicion numérica simple de la directividad de los auxiliares auditivos. El método es una extensiócute;n del indíce convencional de directividad (DI) y se denomina índice de directividad general (ODI). La directividad de cinco estilos diferentes de auxiliares auditivos fue comparada con la del oído al descubierto. El auxiliar retroauricular (BTE) mostrócute; menor direccionalidad en comparaciócute;n con los otros tipos de auxiliares y con el oído al descubierto. Se apreciaropn solamente diferencias menores en la directividad entre los cuatro diferentes auxiliares colocados en el oído o con el conducto auditivo abierto. La medida convencional del DI es menos adecuada para los auxiliares auditivos porque ignora el sonido que viene de otros lados que no sean el frontal. Para cuantificar la direccionalidad de un auxiliar auditivo en una situatiócute;n de la vida real, sugerimos la mediciócute;n numérica simple ODI, compensada con el índice de articulatiócute;n y relacionada con un segmento de escucha de 0–30±. Una aplicaciócute;n de los datos se muestra para el BTE con un micrócute;fono direccional.

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