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Paper Abstract and Keywords
Presentation 2020-12-02 09:40
Approximation Method for Bayes Optimal Prediction in Phoneme Recognition Problem
Taishi Yamaoka, Shota Saito, Toshiyasu Matsushima (Waseda Univ.) IT2020-30
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a method of phoneme recognition. In the previous studies on phoneme recognition using the Hidden Markov Model, the Hidden Markov Model used for prediction is defined as one by a certain criteria. In addition, for the defined Hidden Markov Model, parameters were estimated from the training data, and the phonemes corresponding to the new speech data were predicted using paremters.
In this peper, we assume 0-1 loss as the loss function, and formulate the optimum prediction based on Bayesian criterion. In other words, instead of selecting one Hidden Markov Model and estimating its parameters and making predictions using them, we propose a prediction that directly minimizes the probability of error in the prediction.
Although this prediction is theoretically optimal, its calculation involves two problems: (i) The complexity of the sum calculation of the state transition series is on the exponential order with respect to the length of the voice. (ii) It is difficult to analytically calculate the integral by the posterior distribution of the parameters of the Hidden Markov Model. In order to solve these problems, in this paper, we apply the Viterbi algorithm for problem (i) and the Variational Bayesian method for problem (ii), and propose a Bayesian semi-optimal algorithm. This algorithm makes predictions by weighted averages of approximate posterior distributions of multiple Hidden Markov Models. By conducting numerical experiments using artificial data, it was confirmed that the proposed method has a smaller false recognition rate than the method of selecting and predicting one model as in the previous research.
Keyword (in Japanese) (See Japanese page) 
(in English) Phoneme recognition / Hidden Markov model / Bayes criteria / / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 268, IT2020-30, pp. 32-37, Dec. 2020.
Paper # IT2020-30 
Date of Issue 2020-11-24 (IT) 
ISSN Online edition: ISSN 2432-6380
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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)
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Conference Information
Committee IT  
Conference Date 2020-12-01 - 2020-12-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Lectures for Young Researchers, General 
Paper Information
Registration To IT 
Conference Code 2020-12-IT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Approximation Method for Bayes Optimal Prediction in Phoneme Recognition Problem 
Sub Title (in English)  
Keyword(1) Phoneme recognition  
Keyword(2) Hidden Markov model  
Keyword(3) Bayes criteria  
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1st Author's Name Taishi Yamaoka  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Shota Saito  
2nd Author's Affiliation Waseda University (Waseda Univ.)
3rd Author's Name Toshiyasu Matsushima  
3rd Author's Affiliation Waseda University (Waseda Univ.)
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Speaker Author-1 
Date Time 2020-12-02 09:40:00 
Presentation Time 20 minutes 
Registration for IT 
Paper # IT2020-30 
Volume (vol) vol.120 
Number (no) no.268 
Page pp.32-37 
#Pages
Date of Issue 2020-11-24 (IT) 


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