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Paper Abstract and Keywords
Presentation 2015-12-17 10:15
Silent Speech BCI -- An investigation for practical problems --
Shun Hirose (KIT), Hiromi Yamaguchi (NEC), Takashi Ito, Toshimasa Yamazaki (KIT), Shinichi Fukuzumi (NEC), Takahiro Yamanoi (Hokkai Gakuen Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) We have developed single-trial-EEG-based silent speech BCI (SSBCI) using speech signals. Our algorithm consisted of (1) extraction of independent components (ICs) whose dipole solutions were located at the Broca’s area by applying ICA and equivalent current dipole source localization (ECDL) to EEGs during actual or silent word speeches, (2) description of the relationship between spectrograms of speech signals and the EEGs during the actual speeches by Kalman filters, (3) estimation of SS spectrograms by inputting the EEGs during the silent speeches to the Kalman filters, and (4) recognition of silent words by comparing log-likelihood values of Hidden Markov Models (HMMs) that the estimated spectrograms were inputted to. The accuracy of “haru”- and “natsu”-HMMs was 39 % and 83 %, respectively. Unknown that which silent season EEGs were recorded during, the accuracy was 25 % and 47 %, respectively. Using the speech signal database, the one-hiragana-character-HMM yielded the accuracy of 0 % and 60 % for /ha/ and /ru/, respectively, and that of 88 % and 13 % for /na/ and /tsu/, respectively. Moreover, for the HMM with only gamma bands of the BA-ICs, the accuracy was drastically improved.
Keyword (in Japanese) (See Japanese page) 
(in English) BCI / Silent Speech / ICA / ECDL / Kalman filter / HMM / /  
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Conference Information
Committee HCGSYMPO  
Conference Date 2015-12-16 - 2015-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Toyama International Conference Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Human communication, etc. 
Paper Information
Registration To HCGSYMPO 
Conference Code 2015-12-HCGSYMPO 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Silent Speech BCI 
Sub Title (in English) An investigation for practical problems 
Keyword(1) BCI  
Keyword(2) Silent Speech  
Keyword(3) ICA  
Keyword(4) ECDL  
Keyword(5) Kalman filter  
Keyword(6) HMM  
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Keyword(8)  
1st Author's Name Shun Hirose  
1st Author's Affiliation Kyusyu Institute of Technology (KIT)
2nd Author's Name Hiromi Yamaguchi  
2nd Author's Affiliation Knowledge Discovery Research Laboratories, NEC (NEC)
3rd Author's Name Takashi Ito  
3rd Author's Affiliation Kyusyu Institute of Technology (KIT)
4th Author's Name Toshimasa Yamazaki  
4th Author's Affiliation Kyusyu Institute of Technology (KIT)
5th Author's Name Shinichi Fukuzumi  
5th Author's Affiliation Knowledge Discovery Research Laboratories, NEC (NEC)
6th Author's Name Takahiro Yamanoi  
6th Author's Affiliation Hokkai Gakuen University (Hokkai Gakuen Univ.)
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Speaker Author-1 
Date Time 2015-12-17 10:15:00 
Presentation Time 25 minutes 
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