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Paper Abstract and Keywords
Presentation 2009-10-30 10:15
The comparison between the deletion-based methods and the mixing-basedmethods for safe speech CAPTCHA systems
Takuya Nishimoto (Univ. of Tokyo), Hitomi Matsumura, Takayuki Watanabe (Tokyo Woman's Christian Univ.) SP2009-58 WIT2009-64
Abstract (in Japanese) (See Japanese page) 
(in English) Speech-based CAPTCHA systems, which distinguish between software agents
and human beings, are especially important for persons with visual
disability. The popular approach is based on mixing-based methods,
which use the mixed sounds of target speech and noises. We have
proposed a deletion-based method which uses the phonemic restoration
effects. Our approach can control the difficulty of tasks simply by the
masking ratio.

Our design principle of CAPTCHA insists that such tasks should be chosen
so that the larger difference in performance between the machines and
human beings can be provided. In this paper, we give some hypotheses on
the differences between the deletion-based method and the mixing-based
methods. We also show a plan of experiments which compare the automatic
speech recognition performance, speech intelligibility, and mental
workload of these two approaches.
Keyword (in Japanese) (See Japanese page) 
(in English) Security / Visual Imparement / Speech Recognition / CAPTCHA / Mixing-based Method / Deletion-based Method / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 260, WIT2009-64, pp. 55-60, Oct. 2009.
Paper # WIT2009-64 
Date of Issue 2009-10-22 (SP, WIT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee WIT SP  
Conference Date 2009-10-29 - 2009-10-30 
Place (in Japanese) (See Japanese page) 
Place (in English) ASPAM 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Welfare and speech processing, etc. 
Paper Information
Registration To WIT 
Conference Code 2009-10-WIT-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) The comparison between the deletion-based methods and the mixing-basedmethods for safe speech CAPTCHA systems 
Sub Title (in English)  
Keyword(1) Security  
Keyword(2) Visual Imparement  
Keyword(3) Speech Recognition  
Keyword(4) CAPTCHA  
Keyword(5) Mixing-based Method  
Keyword(6) Deletion-based Method  
1st Author's Name Takuya Nishimoto  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Hitomi Matsumura  
2nd Author's Affiliation Tokyo Woman's Christian University. (Tokyo Woman's Christian Univ.)
3rd Author's Name Takayuki Watanabe  
3rd Author's Affiliation Tokyo Woman's Christian University. (Tokyo Woman's Christian Univ.)
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Date Time 2009-10-30 10:15:00 
Presentation Time 30 
Registration for WIT 
Paper # IEICE-SP2009-58,IEICE-WIT2009-64 
Volume (vol) IEICE-109 
Number (no) no.259(SP), no.260(WIT) 
Page pp.55-60 
#Pages IEICE-6 
Date of Issue IEICE-SP-2009-10-22,IEICE-WIT-2009-10-22 

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