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Paper Abstract and Keywords
Presentation 2018-10-12 10:25
Secondary path characteristic changes on ANC systems for automobile and one examination about countermeasure against the changes.
Taku Sugai, Nozomu Saito (ALPINE) EA2018-59
Abstract (in Japanese) (See Japanese page) 
(in English) Active Noise Control (ANC) systems using Filtered-x LMS Algorithm have malfunction caused by differences of characteristic between secondary paths and its models (modeling errors). We investigated changes of secondary paths characteristics of ANC systems for automobiles under various conditions. And we confirmed influence of the changes using computer simulation. As a result, it was revealed that temperature and number of persons do not give a serious influence, but opening windows or exchanging loudspeakers sometimes destabilize the adaptive filters. Re-identification of the secondary paths is needed to solve the problem. Therefore, we considered about the adaptive identification technique that could balance the adaptation speed with the identification accuracy under low S/N condition because users usually cannot identify the secondary paths characteristics under high S/N environment. And we confirmed that we can adjust both the adaptation speed and the identification accuracy more flexibly than LMS algorithm by use of an algorithm that is derived from approximation of Steepest Descent algorithm.
Keyword (in Japanese) (See Japanese page) 
(in English) Active Noise Control / Filtered-x LMS Algorithm / Secondary path characteristic change / Modeling error / Adaptation identification / Adaptation speed / Identification precision /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 234, EA2018-59, pp. 33-44, Oct. 2018.
Paper # EA2018-59 
Date of Issue 2018-10-04 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
Download PDF EA2018-59

Conference Information
Committee EA  
Conference Date 2018-10-11 - 2018-10-12 
Place (in Japanese) (See Japanese page) 
Place (in English) Iwaki business Innovation Center (Iwaki) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Engineering/Electro Acoustics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2018-10-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Secondary path characteristic changes on ANC systems for automobile and one examination about countermeasure against the changes. 
Sub Title (in English)  
Keyword(1) Active Noise Control  
Keyword(2) Filtered-x LMS Algorithm  
Keyword(3) Secondary path characteristic change  
Keyword(4) Modeling error  
Keyword(5) Adaptation identification  
Keyword(6) Adaptation speed  
Keyword(7) Identification precision  
Keyword(8)  
1st Author's Name Taku Sugai  
1st Author's Affiliation ALPINE ELECTRONICS, INC. (ALPINE)
2nd Author's Name Nozomu Saito  
2nd Author's Affiliation ALPINE ELECTRONICS, INC. (ALPINE)
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Speaker Author-1 
Date Time 2018-10-12 10:25:00 
Presentation Time 25 minutes 
Registration for EA 
Paper # EA2018-59 
Volume (vol) vol.118 
Number (no) no.234 
Page pp.33-44 
#Pages 12 
Date of Issue 2018-10-04 (EA) 

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