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Paper Abstract and Keywords
Presentation 2026-03-04 11:00
[Poster Presentation] A study on the side-lobe suppression in parametric array loudspeaker using optimization technique
Ryu Nakagawa, Shota Toyooka (Kansai Univ.), Kenta Iwai (Osaka Sangyo Univ.), Yoshinobu Kajikawa (Kansai Univ.) EA2025-153 SIP2025-173 SP2025-106
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents an optimal sideband-weight design framework for reducing difference-frequency sidelobes in parametric array loudspeakers (PALs) using a convolution-based model. By optimizing the sideband weight function to ensure lower sound pressure outside the target directional region than within it, the proposed method enables the formation of a highly directional acoustic beam. The optimization problem is formulated by minimizing the sum of squared deviations between the audible sound generated by the convolution model and an ideal target sound field. Numerical simulations of PAL beam characteristics verify that the proposed method significantly suppresses off-target sound pressure while maintaining a sharp beam in the desired direction.
Keyword (in Japanese) (See Japanese page) 
(in English) Parametric array loudspeaker (PAL) / Ultrasonic sound / Phased array technique / Beam steering / Optimization / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 369, EA2025-153, pp. 471-476, March 2026.
Paper # EA2025-153 
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 EA2025-153 SIP2025-173 SP2025-106

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 the side-lobe suppression in parametric array loudspeaker using optimization technique 
Sub Title (in English)  
Keyword(1) Parametric array loudspeaker (PAL)  
Keyword(2) Ultrasonic sound  
Keyword(3) Phased array technique  
Keyword(4) Beam steering  
Keyword(5) Optimization  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ryu Nakagawa  
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 Kenta Iwai  
3rd Author's Affiliation Osaka Sangyo University (Osaka Sangyo Univ.)
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 # EA2025-153, SIP2025-173, SP2025-106 
Volume (vol) vol.125 
Number (no) no.369(EA), no.370(SIP), no.371(SP) 
Page pp.471-476 
#Pages 6 
Date of Issue 2026-02-23 (EA, SIP, SP) 

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