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Paper Abstract and Keywords
Presentation 2015-03-03 10:45
[Poster Presentation] Investigation of local area sound reproduction using a circular array of loudspeakers with null-space based sound field control
Takayuki Seki, Yoichi Haneda (UEC) EA2014-114 SIP2014-155 SP2014-177
Abstract (in Japanese) (See Japanese page) 
(in English) We investigated a local area sound reproduction system where the listener can hear the sound only in the proximity of the loudspeaker. In this paper, we used the circular loudspeaker array with null-space based sound field control (NBSFC) to create a local area sound reproduction system based on the boundary surface control principle. The performance of the prototype system of the circular loudspeaker array was evaluated in an anechoic chamber. As a result, the prototype system exhibited a quicker sound attenuation than the monopole sound source in the frequency range of 500–1500 Hz. In addition, we compared the filter coefficients of the loudspeaker array of the NBSFC method with those of the evanescent wave method. In the NBSFC method, the filters on both side of the filter that has a positive phase have opposite phases and half amplitudes. On the other hand, in the evanescent wave method, the filters alternately exhibit a plus or minus sign while having the same amplitude. In both cases, the sounds radiated from the loudspeakers may instantaneously cancel each other by opposite phases to achieve a quicker sound attenuation.
Keyword (in Japanese) (See Japanese page) 
(in English) local area sound reproduction / evanescent wave / circular array of loudspeakers / null-space based sound field control / boundary surface control principle / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 473, EA2014-114, pp. 231-236, March 2015.
Paper # EA2014-114 
Date of Issue 2015-02-23 (EA, SIP, SP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 EA2014-114 SIP2014-155 SP2014-177

Conference Information
Committee SIP EA SP  
Conference Date 2015-03-02 - 2015-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English)  
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Paper Information
Registration To EA 
Conference Code 2015-03-SIP-EA-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of local area sound reproduction using a circular array of loudspeakers with null-space based sound field control 
Sub Title (in English)  
Keyword(1) local area sound reproduction  
Keyword(2) evanescent wave  
Keyword(3) circular array of loudspeakers  
Keyword(4) null-space based sound field control  
Keyword(5) boundary surface control principle  
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1st Author's Name Takayuki Seki  
1st Author's Affiliation University of Electro-Communications (UEC)
2nd Author's Name Yoichi Haneda  
2nd Author's Affiliation University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2015-03-03 10:45:00 
Presentation Time 90 minutes 
Registration for EA 
Paper # EA2014-114, SIP2014-155, SP2014-177 
Volume (vol) vol.114 
Number (no) no.473(EA), no.474(SIP), no.475(SP) 
Page pp.231-236 
#Pages
Date of Issue 2015-02-23 (EA, SIP, SP) 


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