Journal article
Using a signal cancellation technique involving impulse response to assess directivity of hearing aids
The Journal of the Acoustical Society of America, Vol.126(6), pp.3214-3226
12/01/2009
DOI: 10.1121/1.3238161
PMID: 20000935
Abstract
The directional microphone systems of modern digital hearing aids are capable of changing their spatial directivity pattern and/or the microphone mode in response to changes in the properties of environmental sounds. These adaptive/automatic features make measurement of a hearing aid's directivity in a given test environment very difficult. Assessing the directivity of such systems requires a signal that can record the system's response while not changing the system's directivity. This paper proposes a method using a signal cancellation technique involving impulse responses to acoustically assess a hearing aid's directivity (referred to as the IR method). The impulse is presumed to be undetectable to the adaptive/automatic system because it contains little energy and a short response could be recorded before the system actually reacts. In the current study, the IR method was evaluated by testing five adaptive/automatic directional hearing aids in noise of various intensities. The results revealed that the IR method was an accurate and repeatable way to assess slow-acting directional systems in noise of varying intensities and fast-acting systems in noise of high intensities.
Details
- Title: Subtitle
- Using a signal cancellation technique involving impulse response to assess directivity of hearing aids
- Creators
- Yu-Hsiang Wu - University of IowaRuth A Bentler - Univ Iowa, Dept Commun Sci & Disorders, Iowa City, IA 52242 USA
- Resource Type
- Journal article
- Publication Details
- The Journal of the Acoustical Society of America, Vol.126(6), pp.3214-3226
- DOI
- 10.1121/1.3238161
- PMID
- 20000935
- NLM abbreviation
- J Acoust Soc Am
- ISSN
- 0001-4966
- eISSN
- 1520-8524
- Publisher
- American Institute of Physics
- Number of pages
- 13
- Grant note
- H133E080006 / Department of Education/National Institute on Disability and Rehabilitation Research
- Language
- English
- Date published
- 12/01/2009
- Academic Unit
- Communication Sciences and Disorders; Otolaryngology
- Record Identifier
- 9984258844802771
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