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Paper Abstract and Keywords
Presentation 2026-03-04 11:00
[Poster Presentation] A Study on Parameter Estimation of Equivalent Circuit for Balanced Armature Transducer
Yusuke Umemiya, Shota Toyooka (Kansai Univ), Shunsuke Kita (ORIST), Yoshinobu Kajikawa (Kansai Univ) EA2025-150 SIP2025-170 SP2025-103
Abstract (in Japanese) (See Japanese page) 
(in English) The Lumped Parameter Method (LPM) and the Finite Element Method (FEM) are widely used for analyzing small acoustic devices. Although FEM offers high accuracy for complex geometries, it often requires substantial computational resources. In contrast, LPM enables efficient computation but suffers from limited accuracy, as theoretically derived parameters frequently result in frequency responses that deviate from experimental observations. To address this issue, adaptive algorithms for estimating equivalent circuit parameters have been proposed. This study investigates optimization methods to achieve high-precision parameter estimation for equivalent circuits of balanced armature (BA) type transducers, a class of small acoustic transducers. Two optimization approaches are examined: one that converts an analog-domain transfer function into a digital transfer function via bilinear transformation and optimizes the resulting coefficients in the frequency domain, and
another that leverages impedance characteristics and mechanical system theory for parameter optimization. The objective is to improve consistency with measured data while preserving the computational efficiency of LPM. Simulation results demonstrate significant accuracy improvements in terms of the normalized mean square error (NMSE): the conventional method yields an NMSE of 0.4024, whereas the proposed method achieves 0.007626 and the alternative method achieves 0.08786.
Keyword (in Japanese) (See Japanese page) 
(in English) Balanced Armature Transducer / Lumped Parameter Method / Parameter Estimation / Optimization / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 369, EA2025-150, pp. 455-460, March 2026.
Paper # EA2025-150 
Date of Issue 2026-02-23 (EA, SIP, SP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
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 EA2025-150 SIP2025-170 SP2025-103

Conference Information
Committee SP EA SIP IPSJ-SLP  
Conference Date 2026-03-02 - 2026-03-04 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EA 
Conference Code 2026-03-SP-EA-SIP-SLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Parameter Estimation of Equivalent Circuit for Balanced Armature Transducer 
Sub Title (in English)  
Keyword(1) Balanced Armature Transducer  
Keyword(2) Lumped Parameter Method  
Keyword(3) Parameter Estimation  
Keyword(4) Optimization  
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Keyword(6)  
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1st Author's Name Yusuke Umemiya  
1st Author's Affiliation Kansai University (Kansai Univ)
2nd Author's Name Shota Toyooka  
2nd Author's Affiliation Kansai University (Kansai Univ)
3rd Author's Name Shunsuke Kita  
3rd Author's Affiliation Osaka Research Institute of Industrial Science and Technology (ORIST)
4th Author's Name Yoshinobu Kajikawa  
4th Author's Affiliation Kansai University (Kansai Univ)
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Speaker Author-1 
Date Time 2026-03-04 11:00:00 
Presentation Time 80 minutes 
Registration for EA 
Paper # EA2025-150, SIP2025-170, SP2025-103 
Volume (vol) vol.125 
Number (no) no.369(EA), no.370(SIP), no.371(SP) 
Page pp.455-460 
#Pages 6 
Date of Issue 2026-02-23 (EA, SIP, SP) 

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