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KMID : 1137820110320030198
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의공학회지
2011 Volume.32 No. 3 p.198 ~ p.206
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Objective Evaluation of Beamforming Techniques for Hearing Devices with Two-channel Microphone
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Cho Kyeong-Won
Han Jong-Hee
Kim In-Young
Kim Sun-Il
Hong Sung-Hwa
Lee Sang-Min
Kim Dong-Wook
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Abstract
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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 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.
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KEYWORD
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beamforming, hearing device
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