A New Asymmetric Directional Microphone Algorithm With Automatic Mode-Switching Ability for Binaural Hearing Support Devices

Title
A New Asymmetric Directional Microphone Algorithm With Automatic Mode-Switching Ability for Binaural Hearing Support Devices
Authors
장동표
Keywords
Hearing aid; Asymmetric directional microphone; Spatial noise reduction; Objective measurement
Issue Date
2015-06
Publisher
WILEY-BLACKWELL
Citation
ARTIFICIAL ORGANS, v. 39, no. 6, Page. 535-540
Abstract
For hearing support devices, it is important to minimize the negative effect of ambient noises for speech recognition but also, at the same time, supply natural ambient sounds to the hearing-impaired person. However, conventional fixed bilateral asymmetric directional microphone (DM) algorithms cannot perform in such a way when the DM-mode device and a dominant noise (DN) source are placed on the same lateral hemisphere. In this study, a new binaural asymmetric DM algorithm that can overcome the defects of conventional algorithms is proposed. The proposed algorithm can estimate the position of a specific DN in the 90 degrees-270 degrees range and switch directional- and omnidirectional-mode devices automatically if the DM-mode device and the DN are placed in opposite lateral hemispheres. Computer simulation and KEMAR mannequin recording tests demonstrated that the performance of the conventional algorithm deteriorated when the DM-mode device and the DN were placed in the opposite hemisphere; in contrast, the performance of the proposed algorithm was consistently maintained regardless of directional variations in the DN. Based on these experimental results, the proposed algorithm may be able to improve speech quality and intelligibility for hearing-impaired persons who have similar degrees of hearing impairment in both ears.
URI
http://onlinelibrary.wiley.com/doi/10.1111/aor.12417/fullhttp://hdl.handle.net/20.500.11754/25836
ISSN
0160-564X; 1525-1594
DOI
http://dx.doi.org/10.1111/aor.12417
Appears in Collections:
GRADUATE SCHOOL OF BIOMEDICAL SCIENCE AND ENGINEERING[S](의생명공학전문대학원) > ETC
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