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Paper Abstract and Keywords
Presentation 2009-12-21 13:00
Recent Evaluations of a WFST-Based Speech Recognition Decoder
Paul R. Dixon, Josef R. Novak, Tasuku Oonishi, Sadaoki Furui (Tokyo Inst. of Tech.) NLC2009-14 SP2009-78
Abstract (in Japanese) (See Japanese page) 
(in English) This paper describes the latest performance evaluations on the Tokyo Tech Transducer-based (T3) speech decoder. These evaluations focus on two particular tasks which include a large-vocabulary continuous speech
transcription system with a 460k vocabulary evaluated on the JNAS corpus, and a voice search system developed for an all-Japan train timetables task. This paper provides a detailed explanation of the successful steps taken to construct a large integrated network which achieves high recognition performance, based on an exhaustive comparison of different construction strategies. Furthermore, in the context of the voice search task, this paper provides a performance comparison of two widely popular acoustic model toolkits, HTK and SphinxTrain in the unified context of the T3 decoder. In particular these results indicate that there is a significant advantage to employing the log semiring for all WFST construction operations. These results also serve to further verify the flexibility and speed of the T3 decoder on a variety of different tasks.
Keyword (in Japanese) (See Japanese page) 
(in English) Speech Recognition / WFST / LVCSR / / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 356, SP2009-78, pp. 25-30, Dec. 2009.
Paper # SP2009-78 
Date of Issue 2009-12-14 (NLC, SP) 
ISSN Print edition: ISSN 0913-5685    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 NLC2009-14 SP2009-78

Conference Information
Committee SP NLC  
Conference Date 2009-12-21 - 2009-12-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) 11th Spoken Language Symposium (SP/NLC/SLP) 
Paper Information
Registration To SP 
Conference Code 2009-12-SP-NLC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recent Evaluations of a WFST-Based Speech Recognition Decoder 
Sub Title (in English)  
Keyword(1) Speech Recognition  
Keyword(2) WFST  
Keyword(3) LVCSR  
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Keyword(5)  
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1st Author's Name Paul R. Dixon  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Josef R. Novak  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
3rd Author's Name Tasuku Oonishi  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
4th Author's Name Sadaoki Furui  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2009-12-21 13:00:00 
Presentation Time 25 minutes 
Registration for SP 
Paper # NLC2009-14, SP2009-78 
Volume (vol) vol.109 
Number (no) no.355(NLC), no.356(SP) 
Page pp.25-30 
#Pages 6 
Date of Issue 2009-12-14 (NLC, SP) 

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