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Paper Abstract and Keywords
Presentation 2015-01-22 15:30
Analysis of effects of voice mimicry on speaker verification and acoustic features of the imitated voices
Koji Iwano, Taito Sone, Kanako Sakamoto (Tokyo City Univ.) SP2014-134
Abstract (in Japanese) (See Japanese page) 
(in English) It is quite important to recognize the vulnerability of speaker verification (SV) systems against voice mimicry attacks and to propose countermeasure methods against them. This paper describes an acoustic feature analysis using imitated speech uttered by non-professional speakers and a performance degradation of an HMM-based SV system by the mimicry attacks using the imitated speech. We collected normal/imitated speech uttered by 6 males and 6 females, and analyzed the cepstral feature changes by the imitation. The analysis results show the tendency that the acoustic features of the speakers' voice significantly change by their efforts of the imitation, whereas the distance of the acoustic features between imitated and target speaker's speech is still large. The experimental results on the SV system performance show that the mimicry attacks increase equal error rates by 1.2 to 2.7 times. These facts indicate that non-professional mimicry attacks rarely succeed in spoofing the SV system and yield actual performance degradations in spite of the situation where there is a large gap of acoustic features between imitated and target speech.
Keyword (in Japanese) (See Japanese page) 
(in English) Speaker verification / Imitated speech / Voice mimicry attack / Acoustic feature analysis / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 411, SP2014-134, pp. 43-48, Jan. 2015.
Paper # SP2014-134 
Date of Issue 2015-01-15 (SP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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reproduction
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 SP  
Conference Date 2015-01-22 - 2015-01-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Juroku Plaza 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SP 
Conference Code 2015-01-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis of effects of voice mimicry on speaker verification and acoustic features of the imitated voices 
Sub Title (in English)  
Keyword(1) Speaker verification  
Keyword(2) Imitated speech  
Keyword(3) Voice mimicry attack  
Keyword(4) Acoustic feature analysis  
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1st Author's Name Koji Iwano  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Taito Sone  
2nd Author's Affiliation Tokyo City University (Tokyo City Univ.)
3rd Author's Name Kanako Sakamoto  
3rd Author's Affiliation Tokyo City University (Tokyo City Univ.)
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Speaker Author-1 
Date Time 2015-01-22 15:30:00 
Presentation Time 25 minutes 
Registration for SP 
Paper # SP2014-134 
Volume (vol) vol.114 
Number (no) no.411 
Page pp.43-48 
#Pages
Date of Issue 2015-01-15 (SP) 


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