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Paper Abstract and Keywords
Presentation 2026-03-03 14:30
[Invited Talk] Acoustic distance measurement method to target based on phase interference of audible sound -- From the principle to the current progress --
Noboru Nakasako, Tetsuji Uebo, Toshihiro Shinohara (Kindai UNiv.), Masato Nakayama (Ritsumeikan UNiv.) EA2025-128 SIP2025-148 SP2025-81
Abstract (in Japanese) (See Japanese page) 
(in English) Information on the distance to and the direction of a target is essential in many fields, and practical distance sensing technologies are therefore required. In the radar field, a standing-wave radar based on phase interference was proposed by Uebo and is known as a practical method that extracts distance information by applying the Fourier transform twice to the observed signal. The authors have applied this principle to acoustic distance measurement using audible sound and have investigated methods for accurately estimating distances from very short ranges to longer distances. In the course of this study, several results have been obtained, including single-channel ranging, distance estimation using cross-spectral analysis based on multiple adjacent microphone observations, and distance estimation to a sound source by actively exploiting multiple reflections. In this invited lecture, the fundamental principle of acoustic distance measurement is first outlined, followed by an introduction to these methods. The ranging characteristics under noisy environments are also briefly discussed, and a simple implementation on a microcontroller is presented. Finally, future prospects toward practical applications in real environments are addressed.
Keyword (in Japanese) (See Japanese page) 
(in English) acoustic distance measurement / power spectrum / cross-spectrum / range spectrum / multiple reflection / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 370, SIP2025-148, pp. 330-330, March 2026.
Paper # SIP2025-148 
Date of Issue 2026-02-23 (EA, SIP, SP) 
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)
Download PDF EA2025-128 SIP2025-148 SP2025-81

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 SIP 
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) Acoustic distance measurement method to target based on phase interference of audible sound 
Sub Title (in English) From the principle to the current progress 
Keyword(1) acoustic distance measurement  
Keyword(2) power spectrum  
Keyword(3) cross-spectrum  
Keyword(4) range spectrum  
Keyword(5) multiple reflection  
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Keyword(8)  
1st Author's Name Noboru Nakasako  
1st Author's Affiliation Kindai University (Kindai UNiv.)
2nd Author's Name Tetsuji Uebo  
2nd Author's Affiliation Kindai University (Kindai UNiv.)
3rd Author's Name Toshihiro Shinohara  
3rd Author's Affiliation Kindai University (Kindai UNiv.)
4th Author's Name Masato Nakayama  
4th Author's Affiliation Ritsumeikan University (Ritsumeikan UNiv.)
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Speaker Author-1 
Date Time 2026-03-03 14:30:00 
Presentation Time 60 minutes 
Registration for SIP 
Paper # EA2025-128, SIP2025-148, SP2025-81 
Volume (vol) vol.125 
Number (no) no.369(EA), no.370(SIP), no.371(SP) 
Page p.330 
#Pages 1 
Date of Issue 2026-02-23 (EA, SIP, SP) 

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