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Paper Abstract and Keywords
Presentation 2022-03-01 09:20
[Poster Presentation] A Study on BoSC Recording Using a Small Rigid Sphere Microphone Array -- Evaluation of prototype system of a small rigid sphere microphone array --
Shusei Takayama, Shiro Ise (TDU) EA2021-67 SIP2021-94 SP2021-52
Abstract (in Japanese) (See Japanese page) 
(in English) By measuring the sound pressure and particle velocity on the boundary surface surrounding a certain region in the primary sound field and reproducing the sound pressure and particle velocity on the boundary surface using a large number of loudspeakers in the secondary sound field, it is possible to create the sound field of the region in the primary field inside the region in the secondary sound field. The principle of such boundary surface control (BoSC) has been realized by installing a large number of microphones on a microphone frame such as BoSC microphone array, that is the same structure as the C80 fullerene molecular structure, in order to measure the sound pressure on the boundary. Since the sound field is reproduced with relatively high accuracy even in the area outside the microphone frame from the demonstration of 3D sound field reproduction using the sound cask so far, an experiment of sound field reproduction using a half-size microphone array was conducted. As a result, it was clarified by numerical simulation and experiment that the accuracy of the sound field reproduction is kept even if the microphone array was half-sized, and further, it became clear by the numerical simulation that the accuracy of the sound field reproduction is also kept even if the microphone array was changed to rigid sphere. Thus, the purpose of this study is to find the possibility of sound field reproduction based on the BoSC principle by actually prototyping a small rigid sphere microphone array. Specifically, a relatively low-cost ECMs are mounted on a sphere created by a 3D printer, the transfer function is measured in the sound cask to design its inverse system and evaluate its performance by comparing with the performance of the conventional BoSC microphone.
Keyword (in Japanese) (See Japanese page) 
(in English) Microphone array / Sound field reproduction / Boundary surface control principle / BoSC system / Rigid Sphere Microphone Array / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 383, EA2021-67, pp. 21-26, March 2022.
Paper # EA2021-67 
Date of Issue 2022-02-22 (EA, SIP, SP) 
ISSN 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 EA2021-67 SIP2021-94 SP2021-52

Conference Information
Committee EA SIP SP IPSJ-SLP  
Conference Date 2022-03-01 - 2022-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English)  
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Paper Information
Registration To EA 
Conference Code 2022-03-EA-SIP-SP-SLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on BoSC Recording Using a Small Rigid Sphere Microphone Array 
Sub Title (in English) Evaluation of prototype system of a small rigid sphere microphone array 
Keyword(1) Microphone array  
Keyword(2) Sound field reproduction  
Keyword(3) Boundary surface control principle  
Keyword(4) BoSC system  
Keyword(5) Rigid Sphere Microphone Array  
1st Author's Name Shusei Takayama  
1st Author's Affiliation Tokyo denki university (TDU)
2nd Author's Name Shiro Ise  
2nd Author's Affiliation Tokyo denki university (TDU)
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Speaker Author-1 
Date Time 2022-03-01 09:20:00 
Presentation Time 120 minutes 
Registration for EA 
Paper # EA2021-67, SIP2021-94, SP2021-52 
Volume (vol) vol.121 
Number (no) no.383(EA), no.384(SIP), no.385(SP) 
Page pp.21-26 
Date of Issue 2022-02-22 (EA, SIP, SP) 

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