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J Am Acad Audiol 2001; 12(10): 534-544
DOI: 10.1055/s-0042-1745644
Original Article

Effects of Release Time and Directionality on Unilateral and Bilateral Hearing Aid Fittings in Complex Sound Fields

Marni L. Novick
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa
,
Ruth A. Bentler
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa
,
Andrew Dittberner
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa
,
Gregory A. Flamme
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa
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Abstract

In studies to date, the effectiveness of the directional microphone has been investigated independently of the signal processing scheme used in the hearing aid. In addition, the number and placement of the background noise speakers can create an advantage for a particular polar pattern (i.e., cardioid, supercardioid, and hypercardioid) in any laboratory design. With these considerations in mind, the purpose of this investigation was twofold: (1) to determine the effect of different amplitude-compression release times on speech perception ability in noise, measured with directional microphone hearing aids, and (2) to determine the impact of environment (classroom vs anechoic chamber) on those measures. Ten subjects with mild to moderate sensorineural hearing loss participated. Using an eight-speaker complex sound field, speech perception was assessed in an anechoic chamber and a typical classroom environment. None of the release times resulted in superior performance in either the anechoic or classroom environment.

Abbreviations: ANOVA = analysis of variance, BTE = behind the ear, HINT = Hearing in Noise Test, ITE = in the ear, KEMAR = Knowles Electronics Mannikin for Acoustic Research, RBCF = randomized blocks completely factorial, RT = reverberation time, SNR = signal-to-noise ratio, SPIN = Speech Perception in Noise (test), TR = release time

Keywords

Complex sound field - directional microphone - hearing aids - release time


Publikationsverlauf

Artikel online veröffentlicht:
07. März 2022

© 2001. American Academy of Audiology. This article is published by Thieme.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

 

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