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Clinical evaluation of a new hearing aid anti-cardioid directivity pattern.

Abstract Objective: The purpose of this research was to evaluate a new directional hearing aid algorithm which automatically adapts to an anti-cardioid pattern in background noise when a speech signal originates from behind the hearing aid user. Design: Using the hearing-in-noise-test (HINT) in the...

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Published in:International Journal of Audiology Vol. 50; no. 4; pp. 249 - 255
Main Authors: Mueller, H. Gustav, Weber, Jennifer, Bellanova, Martina
Format: research tables/charts Journal Article
Published: Taylor & Francis Ltd Apr2011
Online Access:View this record in EBSCOhost
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        14992027
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      jtl: International Journal of Audiology
      issn: 14992027
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      dt: Apr2011
      vid: 50
      iid: 4
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      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
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        10.3109/14992027.2010.547992
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        atl: Clinical evaluation of a new hearing aid anti-cardioid directivity pattern.
      aug:
        au:
          Mueller, H. Gustav
          Weber, Jennifer
          Bellanova, Martina
        affil: Department of Hearing and Speech Sciences, Vanderbilt University, Nashville, USA
      sug:
        subj:
          Hearing Aids
          Noise
          Audiology Methods
          Hearing Evaluation
          Human
          Algorithms
          Male
          Female
          Middle Age
          Aged
          Aged, 80 and Over
          Repeated Measures
          Analysis of Variance
          Post Hoc Analysis
          Paired T-Tests
          Funding Source
          Middle Aged: 45-64 years
          Aged: 65+ years
          Aged, 80 & over
          Male
          Female
      ab: Abstract Objective: The purpose of this research was to evaluate a new directional hearing aid algorithm which automatically adapts to an anti-cardioid pattern in background noise when a speech signal originates from behind the hearing aid user. Design: Using the hearing-in-noise-test (HINT) in the soundfield, with the sentences delivered adaptively from the back (180°°) and the standard HINT competing noise from the front (0°°; 72 dB SPL), the participants were tested for three different hearing aid conditions: omnidirectional, conventional adaptive directional, and adaptive directional with the anti-cardioid algorithm enabled. Study Sample: Adults (n == 21) with bilaterally symmetrical downward sloping sensorineural hearing loss; experienced hearing aid users and aided bilaterally for experimental testing. Results: Results revealed a significant effect for the hearing aid microphone setting (p < .0001), with a HINT mean RTS of 4.2 dB for conventional adaptive directional, −−0.1 dB for omnidirectional, and −−5.7 dB when the anti-cardioid algorithm was active. This was a large effect size (Cohen's f2). Conclusion: The findings suggest that the signal classification system steered the algorithm correctly, and that when implemented, the anti-cardioid polar pattern resulted in an improvement in speech recognition in background noise for this listening situation. Sumario Objetivo: El propóósito de esta investigacióón fue evaluar un nuevo algoritmo para auxiliares auditivos direccionales que se adapta automááticamente a un patróón anti-cardioide en ruido de fondo cuando una seññal de lenguaje se origina detráás del usuario de un auxiliar auditivo. Diseñño: Usando la prueba de audicióón-en-ruido (HINT), en campo libre, con oraciones enviadas adaptativamente desde atráás (180°°) y el HINT estáándar con ruido competitivo desde el frente (0°°; 72 dB SPL), los participantes fueron evaluados en tres diferentes condiciones de escucha: omnidireccional, direccional adaptativa convencional y adaptativa direccional con el algoritmo anti-cardioide habilitado. Muestra de estudio: Adultos (n == 21) con péérdida auditiva bilateral siméétrica, sensorineural, de perfil descendente, con experiencia en el uso de auxiliares auditivos y con adaptacióón bilateral para la prueba experimental. Resultados: Los resultados revelaron un efecto significativo para el ajuste del micróófono del auxiliar auditivo (p < .0001), con una HINT media y RTS de 4.2 dB para la forma direccional convencional adaptativa, −−0.1 dB para la omnidireccional y −−5.7 dB cuando se habilitóóel algoritmo anti-cardioide. Este fue un efecto de gran envergadura (Cohen's f2). Conclusióón: Los hallazgos sugieren que el sistema de clasificacióón de seññales conducen el algorritmo correctamente y que cuando es habilitado, el patróón polar anti-cardioide determina una mejoríía en el reconocimiento del lenguaje con ruido de fondo en esta situacióón de escucha.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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