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Measuring real-ear signal-to-noise ratio: application to directional hearing aids

Record type: Article

Due to individual characteristics such as head size, earmould type, and earmould venting, the directional benefit that an individual will obtain from a hearing aid cannot be predicted from average data. It is therefore desirable to measure real ear directional benefit. This paper demonstrates a method to measure real ear hearing aid directivity based on a general approach to measure the broadband output signal-to-noise ratio of a hearing aid. Errors arising from non-linearity were tested in simulation and found to be low for typical hearing aid compression ratios. Next, the efficacy of the method to estimate directional benefit was demonstrated on KEMAR. Finally the variability of directional benefit was explored in real-ears. Significant differences in signal-to-noise ratio between directional and omnidirectional microphone settings were demonstrated at most azimuths. Articulation-Index-weighted directional benefit varied by more than 7 dB across ears at some azimuths. Such individual variation in directional benefit has implications when fitting hearing aids: it should not be assumed that all users will receive similar directional benefit from the same hearing aid.

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Citation

Bell, Steven L., Creeke, Sarah A. and Lutman, Mark E. (2010) Measuring real-ear signal-to-noise ratio: application to directional hearing aids International Journal of Audiology, 49, (3), pp. 238-246. (doi:10.3109/14992020903280146).

More information

Published date: March 2010
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 145237
URI: http://eprints.soton.ac.uk/id/eprint/145237
PURE UUID: a480f787-9c31-4056-b071-a64a476932d6

Catalogue record

Date deposited: 16 Apr 2010 14:14
Last modified: 18 Jul 2017 23:06

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Contributors

Author: Steven L. Bell
Author: Sarah A. Creeke
Author: Mark E. Lutman

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