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Paper Abstract and Keywords
Presentation 2018-03-20 09:00
[Poster Presentation] Optimization of Outdoor Loudspeaker Level Based on U50 for Disaster Prevention Administrative Radio
Ryouichi Nishimura (NICT), Shuichi Sakamoto (Tohoku Univ.), Yoshifumi Chisaki (Chiba Inst. of Tech.), Zhenglie Cui (Tohoku Univ.) EA2017-146 SIP2017-155 SP2017-129
Abstract (in Japanese) (See Japanese page) 
(in English) Announcement through outdoor loudspeakers of disaster prevention administrative radio is important not only for early warning but also as the final channel to convey information to evacuating people when the public wireless network is down due to earthquake or flood of access request. Loudspeakers are placed at scattered points in order to cover a wide area but it causes a so-called long-path echo problem by which speech becomes difficult to catch because a single speech arrives multiple times with different delays. An attempt to solve this problem was to controll the speed of utterance appropriately. Another is to adjust the length of silent portions. These research works focused on the temporal aspect of speech. In contrast, we try to ease the problem by adjusting output levels of loudspeakers, employing U50. It was proposed as an index of speech intelligibility in a reverberant environment and defined as a ratio of the energy of early and late sound components. In the long-path echo problem, the early sound is not always the primary component for understanding the speech. Therefore, we newly proposed probabilistic U50 and conducted global optimization with respect to it. As a result, improvement by 6.5 dB was achieved, compared with the case where the speech is presented at the equal level at all loudspeakers.
Keyword (in Japanese) (See Japanese page) 
(in English) Disaster prevention administrative radio / Outdoor loudspeaker / Probabilistic U50 / EM algorithm / Speech intelligibility / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 515, EA2017-146, pp. 245-250, March 2018.
Paper # EA2017-146 
Date of Issue 2018-03-12 (EA, SIP, SP) 
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)
Download PDF EA2017-146 SIP2017-155 SP2017-129

Conference Information
Committee SIP EA SP MI  
Conference Date 2018-03-19 - 2018-03-20 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Speech, Engineering/Electro Acoustics, Signal Processing, and Related Topics [SIP, EA, SP]/ Medical Image Engineering, Analysis, Recognition, etc. [MI] 
Paper Information
Registration To EA 
Conference Code 2018-03-SIP-EA-SP-MI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Optimization of Outdoor Loudspeaker Level Based on U50 for Disaster Prevention Administrative Radio 
Sub Title (in English)  
Keyword(1) Disaster prevention administrative radio  
Keyword(2) Outdoor loudspeaker  
Keyword(3) Probabilistic U50  
Keyword(4) EM algorithm  
Keyword(5) Speech intelligibility  
1st Author's Name Ryouichi Nishimura  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Shuichi Sakamoto  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Yoshifumi Chisaki  
3rd Author's Affiliation Chiba Institute of Technology (Chiba Inst. of Tech.)
4th Author's Name Zhenglie Cui  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
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Date Time 2018-03-20 09:00:00 
Presentation Time 90 
Registration for EA 
Paper # IEICE-EA2017-146,IEICE-SIP2017-155,IEICE-SP2017-129 
Volume (vol) IEICE-117 
Number (no) no.515(EA), no.516(SIP), no.517(SP) 
Page pp.245-250 
#Pages IEICE-6 
Date of Issue IEICE-EA-2018-03-12,IEICE-SIP-2018-03-12,IEICE-SP-2018-03-12 

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