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Paper Abstract and Keywords
Presentation 2024-12-12 14:50
[Poster Presentation] Speaker-Discriminative CTC for Multi-Talker Speech Recognition
Asahi Sakuma, Hiroaki Sato, Ryuga Sugano, Tadashi Kumano, Yoshihiko Kawai (NHK), Tetsuji Ogawa (Waseda Univ.) NLC2024-20 SP2024-11
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a novel method Speaker-Discriminative CTC (SD-CTC) to improve speech recognition accuracy on conversations with overlapping utterances by incorporating a speaker discrimination mechanism into Connectionist Temporal Classification (CTC). In recent years, numerous modifications of the Serialized Output Training (SOT) method, which learns by concatenating the speech transcripts of each speaker in order of appearance, have been introduced as a countermeasure to address overlapped speech, in particular methods that use additional auxiliary information, such as token-level timestamps on the transcript, achieve superior accuracy. However, obtaining such information from real conversational speech is challenging. Our proposed SD-CTC enhances the model's ability to distinguish speakers and vocabulary from each encoder output frame in overlapping multi-talker speech. Multi-task learning of the SOT model with SD-CTC improves recognition accuracy without any additional information other than the transcript for each speaker. Experimental evaluation on simulated overlapping speech dataset shows that our proposed method reduces the word error rate by 25% compared to the original SOT model, which achieves comparable performance to methods using auxiliary information.
Keyword (in Japanese) (See Japanese page) 
(in English) Automatic Speech Recognition / Overlapped speech / Multi-Talker Speech Recognition / Serialized Output Training / Connectionist Temporal Classification / SOT / CTC /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 303, SP2024-11, pp. 6-11, Dec. 2024.
Paper # SP2024-11 
Date of Issue 2024-12-05 (NLC, 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 NLC2024-20 SP2024-11

Conference Information
Committee SP NLC IPSJ-SLP IPSJ-NL  
Conference Date 2024-12-12 - 2024-12-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SP 
Conference Code 2024-12-SP-NLC-SLP-NL 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Speaker-Discriminative CTC for Multi-Talker Speech Recognition 
Sub Title (in English)  
Keyword(1) Automatic Speech Recognition  
Keyword(2) Overlapped speech  
Keyword(3) Multi-Talker Speech Recognition  
Keyword(4) Serialized Output Training  
Keyword(5) Connectionist Temporal Classification  
Keyword(6) SOT  
Keyword(7) CTC  
Keyword(8)  
1st Author's Name Asahi Sakuma  
1st Author's Affiliation NHK Science and Technology Research Laboratories (NHK)
2nd Author's Name Hiroaki Sato  
2nd Author's Affiliation NHK Science and Technology Research Laboratories (NHK)
3rd Author's Name Ryuga Sugano  
3rd Author's Affiliation NHK Science and Technology Research Laboratories (NHK)
4th Author's Name Tadashi Kumano  
4th Author's Affiliation NHK Science and Technology Research Laboratories (NHK)
5th Author's Name Yoshihiko Kawai  
5th Author's Affiliation NHK Science and Technology Research Laboratories (NHK)
6th Author's Name Tetsuji Ogawa  
6th Author's Affiliation Waseda University (Waseda Univ.)
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Speaker Author-1 
Date Time 2024-12-12 14:50:00 
Presentation Time 90 minutes 
Registration for SP 
Paper # NLC2024-20, SP2024-11 
Volume (vol) vol.124 
Number (no) no.302(NLC), no.303(SP) 
Page pp.6-11 
#Pages 6 
Date of Issue 2024-12-05 (NLC, SP) 

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