期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 126, 期 6, 页码 3214-3226出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.3238161
关键词
acoustic measurement; acoustic signal processing; hearing aids; microphones
资金
- Department of Education/National Institute on Disability and Rehabilitation Research [H133E080006]
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.
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