2채널 마이크로폰을 이용한 청각 기기에서의 빔포밍에 대한 객관적 검증

Title
2채널 마이크로폰을 이용한 청각 기기에서의 빔포밍에 대한 객관적 검증
Other Titles
Objective Evaluation of Beamforming Techniques for Hearing Devices with Two-channel Microphone
Author
김인영
Keywords
beamforming; hearing device; 청각기기; 빔포밍
Issue Date
2011-09
Publisher
대한의용생체공학회
Citation
의공학회지, 2011, 32(3), P.198-206
Abstract
Hearing devices like cochlear implant, vibrant soundbridge, etc. try to offer better sound for people. In hearing devices, several beamformers including conventional directional microphone are applicable to noise reduction. Each beamformer has different directional response and it could change sound intelligibility or quality for listeners. Therefore, we investigated the performance of three beamformers, which are first and second order directional microphone, and broadband beamformer(BBF) with a computer simulation assuming hearing device microphone configuration. We also calculated objective measurements which have been used to evaluate speech enhancement algorithms. In the simulation, a single speech and a single babble noisewere propagated from the front and $135^{\circ}$ azimuth degrees respectively. Microphones were configured in an end-fire array and the spacing was varied in comparison. With 3 cm spacing, BBF had about 3 dB higher enhanced SNR than that of directional microphones. However, enhancement of segmental SNR and frequency weighted segmental SNR were similar between the first order directional microphone and broadband beamformer. In addition when steady state noise was used, broadband beamformer showed the increased performance and had the highest enhanced SNR, and segmental SNR.
URI
http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=OOSCB@_2011_v32n3_198
ISSN
1229-0807
DOI
10.9718/JBER.2011.32.3.198
Appears in Collections:
COLLEGE OF MEDICINE[S](의과대학) > MEDICINE(의학과) > Articles
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