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Paper Abstract and Keywords
Presentation 2004-07-22 16:10
Akihide Horita, Yasuhiro Dejima, Kenji Nakayama, Akihiro Hirano (Kanazawa Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper analyzes and compares signal separation, convergence speed and signal distortion in both a feedforward blind source separation (BSS) and a feedback BSS. Let the observed signals and the output signals be $x_i$ and $y_i$, respectively. In the feedback BSS, the transfer functions from $x_i$ to $y_i$ are all 1, and the feedback paths are adjusted so as to cancel the interference. Therefore, signal distortion does not occur after signal separation under some conditions. On the other hands, in the feedforward BSS, all paths from the observations to the outputs are adjusted. There exist some degree of freedom besides to achieve signal separation. This freedom causes signal distortion. In this paper, two kinds of feedforward BSSs in the frequency domain are taken into account. One of them is based on natural gradient method, and the other is an improved method, in which some constraint is removed. The feedforward BSS based on the natural gradient method causes sever signal distortion. The other two methods have almost the same performances on signal separation and convergence speed. Regarding signal distortion, the feedback BSS shows slightly good performance.
Keyword (in Japanese) (See Japanese page) 
(in English) Blind signal source separation / Signal distortion / Feedforward / Feedback / Convergence property / / /  
Reference Info. IEICE Tech. Rep., vol. 104, no. 214, SIP2004-44, pp. 57-62, July 2004.
Paper # SIP2004-44 
Date of Issue 2004-07-15 (WBS, SIP) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee WBS SIP  
Conference Date 2004-07-22 - 2004-07-23 
Place (in Japanese) (See Japanese page) 
Place (in English) NICO PLAZA, Niigata 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SIP 
Conference Code 2004-07-WBS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) フィードフォワード形及びフィードバック形BSSの収束性に関する比較 
Sub Title (in English)  
Keyword(1) Blind signal source separation  
Keyword(2) Signal distortion  
Keyword(3) Feedforward  
Keyword(4) Feedback  
Keyword(5) Convergence property  
1st Author's Name Akihide Horita  
1st Author's Affiliation Kanazawa University (Kanazawa Univ.)
2nd Author's Name Yasuhiro Dejima  
2nd Author's Affiliation Kanazawa University (Kanazawa Univ.)
3rd Author's Name Kenji Nakayama  
3rd Author's Affiliation Kanazawa University (Kanazawa Univ.)
4th Author's Name Akihiro Hirano  
4th Author's Affiliation Kanazawa University (Kanazawa Univ.)
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Speaker Author-1 
Date Time 2004-07-22 16:10:00 
Presentation Time 25 minutes 
Registration for SIP 
Paper # WBS2004-25, SIP2004-44 
Volume (vol) vol.104 
Number (no) no.216(WBS), no.214(SIP) 
Page pp.57-62 
Date of Issue 2004-07-15 (WBS, SIP) 

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