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Paper Abstract and Keywords
Presentation 2026-03-02 11:20
Iterative Source Steering under Subspace Constraints for Multichannel Source Separation
Yutsuki Takeuchi, Taishi Nakashima, Nobutaka Ono (Tokyo Metropolitan Univ.) EA2025-82 SIP2025-102 SP2025-35
Abstract (in Japanese) (See Japanese page) 
(in English) In this study, we propose a semi-blind source separation method that incorporates prior information based on subspace constraints, assuming that the range of source movements is approximately known. The proposed method models variations in steering vectors caused by changes in source positions using a low-dimensional subspace with fewer degrees of freedom than the number of microphones. It then approximates the steering vector at an unknown source position using eigenvectors derived from pre-measured steering vectors. To update the steering vectors within the separation algorithm, we extend the Iterative Source Steering (ISS) technique, which optimizes the separation filters while iteratively updating the steering vectors. This extension allows the algorithm to solve the optimization problem with pre-measured steering vectors. The proposed method is expected to achieve higher separation performance than conventional blind source separation techniques without requiring extensive training. Experimental results demonstrate that the proposed method outperforms conventional ISS-based blind source separation and a minimum variance distortionless response beamformer designed using average steering vectors as prior information.
Keyword (in Japanese) (See Japanese page) 
(in English) source separation / steering vectors / subspace constraint / prior information / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 369, EA2025-82, pp. 57-62, March 2026.
Paper # EA2025-82 
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 EA2025-82 SIP2025-102 SP2025-35

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) Iterative Source Steering under Subspace Constraints for Multichannel Source Separation 
Sub Title (in English)  
Keyword(1) source separation  
Keyword(2) steering vectors  
Keyword(3) subspace constraint  
Keyword(4) prior information  
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1st Author's Name Yutsuki Takeuchi  
1st Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
2nd Author's Name Taishi Nakashima  
2nd Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
3rd Author's Name Nobutaka Ono  
3rd Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
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Speaker Author-1 
Date Time 2026-03-02 11:20:00 
Presentation Time 20 minutes 
Registration for EA 
Paper # EA2025-82, SIP2025-102, SP2025-35 
Volume (vol) vol.125 
Number (no) no.369(EA), no.370(SIP), no.371(SP) 
Page pp.57-62 
#Pages 6 
Date of Issue 2026-02-23 (EA, SIP, SP) 

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