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Paper Abstract and Keywords
Presentation 2014-11-14 11:20
An evaluation of target speech for nonaudible murmur enhancement focusing on its intelligibility under noisy environments
Sakura Tsuruta, Kou Tanaka, Tomoki Toda, Graham Neubig, Sakriani Sakti, Satoshi Nakamura (NAIST) SP2014-102
Abstract (in Japanese) (See Japanese page) 
(in English) Nonaudible murmur (NAM) is a soft whispered voice recorded with a NAM microphone through body conduction. NAM is effective for silent speech communication as it allows a speaker to speak without making an audible sound. However, its intelligibility and naturalness are significantly degraded compared to natural speech owing to acoustic changes caused by body conduction. To address this issue, statistical voice conversion methods from NAM to normal speech (NAM-to-Speech) and to a whispered voice (NAM-to-Whisper) have been proposed. It has been reported that these NAM enhancement methods significantly improve speech quality and intelligibility of NAM, and that NAM-to-Whisper is more effective than NAM-to-Speech. However, it is still not obvious which method is more effective if a listener listens to the enhanced speech in noisy environments, a situation that often happens in silent speech communication. In this report, we assume a situation where NAM is uttered by a speaker in a quiet environment and conveyed to a listener in a noisy environment, and investigate what kinds of target speech is more effective for NAM enhancement. We also propose NAM enhancement methods for converting NAM to other types of target voiced speech. Experimental results show that the conversion process into voiced speech is more effective than that into unvoiced speech for generating more intelligible speech in noisy environments.
Keyword (in Japanese) (See Japanese page) 
(in English) Silent speech interface / Nonaudible murmur / Voice conversion / Listening in noisy conditions / Intelligibility / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 303, SP2014-102, pp. 71-76, Nov. 2014.
Paper # SP2014-102 
Date of Issue 2014-11-06 (SP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
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 2014-11-13 - 2014-11-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Univ. Chikushi Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SP 
Conference Code 2014-11-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An evaluation of target speech for nonaudible murmur enhancement focusing on its intelligibility under noisy environments 
Sub Title (in English)  
Keyword(1) Silent speech interface  
Keyword(2) Nonaudible murmur  
Keyword(3) Voice conversion  
Keyword(4) Listening in noisy conditions  
Keyword(5) Intelligibility  
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Keyword(7)  
Keyword(8)  
1st Author's Name Sakura Tsuruta  
1st Author's Affiliation Nara Institute of Science and Technology (NAIST)
2nd Author's Name Kou Tanaka  
2nd Author's Affiliation Nara Institute of Science and Technology (NAIST)
3rd Author's Name Tomoki Toda  
3rd Author's Affiliation Nara Institute of Science and Technology (NAIST)
4th Author's Name Graham Neubig  
4th Author's Affiliation Nara Institute of Science and Technology (NAIST)
5th Author's Name Sakriani Sakti  
5th Author's Affiliation Nara Institute of Science and Technology (NAIST)
6th Author's Name Satoshi Nakamura  
6th Author's Affiliation Nara Institute of Science and Technology (NAIST)
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Speaker Author-1 
Date Time 2014-11-14 11:20:00 
Presentation Time 25 minutes 
Registration for SP 
Paper # SP2014-102 
Volume (vol) vol.114 
Number (no) no.303 
Page pp.71-76 
#Pages 6 
Date of Issue 2014-11-06 (SP) 

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