A method of wall absorption treatment for enhancing the speech intelligibility at a directional microphone array in a room실내 공간 내 지향성 마이크 어레이에서의 음성 명료도 개선을 위한 벽면 흡음 처리 방법

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Wall absorption treatment effectively reduces reverberation, but requires a large area for a live room and each wall absorption affects speech intelligibility differently. In this study, we try to find the most effective wall for the absorption treatment using the beamforming array microphone in terms of speech intelligibility. The absorption importance factor is defined by using the collision number of reflected sounds on each wall. It allows estimating how much the speech signal will be enhanced by the absorption treatment. A cuboid room with a size of 107 m3 and a reverberation time of 1.1 s is selected for the simulation. When a Helmholtz-type absorption is treated on the wall with the most significant importance factor, the modified clarity for 500 and 1k Hz is improved by 5.1 dB and 4.8 dB respectively, and the speech transmission index is enhanced by 0.06. The difference in results between the proposed method and commercial simulation code is less than a Just-Noticeable Difference (JND). The absorption treatment on the wall with the most significant importance factor shows improvement greater than the wall with the largest area, and its difference is larger than a JND value.
Publisher
ACOUSTICAL SOC KOREA
Issue Date
2021-11
Language
Korean
Article Type
Article
Citation

JOURNAL OF THE ACOUSTICAL SOCIETY OF KOREA, v.40, no.6, pp.649 - 659

ISSN
1225-4428
DOI
10.7776/ASK.2021.40.6.649
URI
http://hdl.handle.net/10203/289913
Appears in Collection
ME-Journal Papers(저널논문)
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