Performance improvement of filterbank ICA with sound localization = 음원탐지를 이용한 필터뱅크 독립요소분석 기법의 성능향상

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In an attempt to improve the performance of ICA based blind source separation methods, the stationarity of the mixing environment is exploited. The similarity between the structural modality of filterbank ICA and human auditory pathway is utilized to develop a binaural system for sound localization and speech enhancement. The developed system includes a filterbank and blind signal separation is conducted on each filtered mixtures which may be decimated for reducing computational complexity. The filterbank architecture is also advantageous to estimate sound directions from noisy multi-source mixtures. The estimated time delays are collected at each subband and are utilized to localize the multiple sources from convolved mixtures. The source arrival time differences are imposed as an additional constraint on filterbankbased ICA approaches. Initialization of subband separation network according to the source directions in localized space results in faster convergence. Though initialization results in faster convergence, no improvement is observed in the final separation performance. However, directional constraint along with initialization on the separation network provides robust behavior to the learning of subband demixing filters even if the mixtures are corrupted with additive noise. Constraining the subband demixing network to the location of source signals in constant mixing environment results in faster convergence and effective permutation correction for noisy observations, moreover, final performance improvement is also observed.
Advisors
Lee, Soo-Youngresearcher이수영researcher
Description
한국과학기술원 : 바이오시스템학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
255494/325007  / 020044308
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 바이오시스템학과, 2006.2, [ ix, 69 p. ]

Keywords

Blind Source Separation; Filterbank; ICA; Arrival Time Difference; 음원의 도착시간차이; 암묵신호분리; 필터뱅크; 독립요소분석

URI
http://hdl.handle.net/10203/27124
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=255494&flag=dissertation
Appears in Collection
BiS-Theses_Master(석사논문)
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