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Paper Abstract and Keywords
Presentation 2007-05-24 17:20
Extraction of the global signal from multi-channel noisy signals and its application in EEG processing
Yoshikazu Washizawa (RIKEN), Yukihiko Yamashita (Tokyo Inst. of Tech), Toshihisa Tanaka (Tokyo Univ.of Agriculture and Tech.), Andrzej Cichocki (RIKEN) EA2007-17 SIP2007-21
Abstract (in Japanese) (See Japanese page) 
(in English) We propose a signal extraction method from multi-sensor network
when each observed signal consists of a global signal and
a local uncorrelated noise.
This process can be modeled by a blind estimation method in which
the number of source signals is larger by one than the number of observations.
We propose an efficient method to estimate the mixing matrix.
We also provide two criteria to extract the global
By estimating the mixing matrix, we can 1) extract
the global signal, 2) find sensors which contains the global
signals well, 3) rank sensors in order of information with respect to
global signal,
and 4) estimate the distribution map of the global signal.
This method is useful in many fields using multi-sensor.
We show the advantage in an application to
Electroencephalogram (EEG) signals that contain huge noise
(less than -20dB).
Keyword (in Japanese) (See Japanese page) 
(in English) Signal extraction / Correlation / Signal to noise ratio / EEG / Alternative least square / Blind signal processing / Weighted average /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 64, SIP2007-21, pp. 61-66, May 2007.
Paper # SIP2007-21 
Date of Issue 2007-05-17 (EA, SIP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Download PDF EA2007-17 SIP2007-21

Conference Information
Committee EA SIP  
Conference Date 2007-05-24 - 2007-05-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustical Signal Processing / General 
Paper Information
Registration To SIP 
Conference Code 2007-05-EA-SIP 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Extraction of the global signal from multi-channel noisy signals and its application in EEG processing 
Sub Title (in English)  
Keyword(1) Signal extraction  
Keyword(2) Correlation  
Keyword(3) Signal to noise ratio  
Keyword(4) EEG  
Keyword(5) Alternative least square  
Keyword(6) Blind signal processing  
Keyword(7) Weighted average  
1st Author's Name Yoshikazu Washizawa  
1st Author's Affiliation RIKEN (RIKEN)
2nd Author's Name Yukihiko Yamashita  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech)
3rd Author's Name Toshihisa Tanaka  
3rd Author's Affiliation Tokyo University of Agriculture and Technology (Tokyo Univ.of Agriculture and Tech.)
4th Author's Name Andrzej Cichocki  
4th Author's Affiliation RIKEN (RIKEN)
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Date Time 2007-05-24 17:20:00 
Presentation Time 30 
Registration for SIP 
Paper # IEICE-EA2007-17,IEICE-SIP2007-21 
Volume (vol) IEICE-107 
Number (no) no.62(EA), no.64(SIP) 
Page pp.61-66 
#Pages IEICE-6 
Date of Issue IEICE-EA-2007-05-17,IEICE-SIP-2007-05-17 

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