Audiometric thresholds measured with single and dual BAHA transducers: The effect of phase inversion

Ross W. Deas, Robert B.A. Adamson, Laura L. Curran, Fawaz M. Makki, Manohar Bance, Jeremy A. Brown

Résultat de recherche: Articleexamen par les pairs

9 Citations (Scopus)

Résumé

Abstract The bone-anchored-hearing-aid (BAHA) transduces airborne sound into skull vibration. Current bilateral BAHA configurations, for sounds directly facing listeners, will apply forces that are in-phase with each other and directed roughly towards the center of the head. Below approximately 1000 Hz the two cochleae respond in approximately the same direction and with approximately the same phase to each BAHA, thus it may be preferable to drive bilateral BAHAs such that when one pushes, the other pulls. This can be achieved by adjusting the relative phase offset of the BAHAs, and doing so results in greater vibration and improved hearing threshold. In this paper we compare performance of bilateral BAHAs driven in this configuration to the standard configuration. In twelve normal participants we show significant improvements in low-frequency (≤750 Hz) hearing thresholds using out-of-phase BAHAs. The threshold measurements are further supported by velocimetric measurements taken at the cochlear promontory in a cadaveric head. Comparing vibration arising from each configuration confirms that out-of-phase driving results in greater vibration. Neither dataset shows either improved or reduced threshold at high frequencies.

Langue d'origineEnglish
Pages (de-à)933-939
Nombre de pages7
JournalInternational Journal of Audiology
Volume49
Numéro de publication12
DOI
Statut de publicationPublished - déc. 2010

ASJC Scopus Subject Areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing

PubMed: MeSH publication types

  • Comparative Study
  • Journal Article

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