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Paper Abstract and Keywords
Presentation 2021-11-16 09:00
[Poster Presentation] Mode-matching with energy constraint of loudspeakers based on analytical approach
Yuki Kawasaki, Makoto Otani (Kyoto Univ.) EA2021-49 EMM2021-76
Abstract (in Japanese) (See Japanese page) 
(in English) Higher-Order Ambisonics (HOA) is a method of sound field reproduction, which usually uses mode matching to control expansion coefficients in the spherical harmonic domain. In HOA, the area of the reproduction region shrinks with increasing frequency when the truncation order is constant. When the reproduction region is smaller than the listener’s head, binaural signals observed in the reproduced field are degraded, especially at the contralateral ear to an arrival direction of wavefronts from a primary source in the primary field. First, this paper numerically shows that the reproduction error at the contralateral ear is caused by the excessively large driving signal level of secondary sources located at positions not corresponding to the direction of arrival of the primary-source wavefronts. Next, this paper proposes a method to suppress the large driving signal level by weighting the driving signal of each secondary source in the mode matching. The proposed method determines weighting coefficients based on the driving signal at each secondary source position derived from an analytical HOA assuming a continuous distribution of secondary sources. The numerical simulation reveals that the proposed method reduces the reproduction error of the signal at the contralateral ear by suppressing the driving signal level of the secondary sources.
Keyword (in Japanese) (See Japanese page) 
(in English) sound field reproduction / Higher-Order Ambisonics / spherical harmonic analysis / Mode-Matching method / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 246, EA2021-49, pp. 128-133, Nov. 2021.
Paper # EA2021-49 
Date of Issue 2021-11-08 (EA, EMM) 
ISSN 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)
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Conference Information
Committee EMM EA ASJ-H  
Conference Date 2021-11-15 - 2021-11-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Beginners Session] Engineering/Electro Acoustics, Content Processing, Digital Watermarking, Psychological and Physiological Acoustics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2021-11-EMM-EA-H 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Mode-matching with energy constraint of loudspeakers based on analytical approach 
Sub Title (in English)  
Keyword(1) sound field reproduction  
Keyword(2) Higher-Order Ambisonics  
Keyword(3) spherical harmonic analysis  
Keyword(4) Mode-Matching method  
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1st Author's Name Yuki Kawasaki  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Makoto Otani  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2021-11-16 09:00:00 
Presentation Time 120 minutes 
Registration for EA 
Paper # EA2021-49, EMM2021-76 
Volume (vol) vol.121 
Number (no) no.246(EA), no.247(EMM) 
Page pp.128-133 
#Pages
Date of Issue 2021-11-08 (EA, EMM) 


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