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Paper Abstract and Keywords
Presentation 2013-05-17 09:45
Fast speech waveform generation using subband coding for speech synthesis
Nobuyuki Nishizawa, Tsuneo Kato (KDDI Labs) EA2013-15 SIP2013-15 SP2013-15
Abstract (in Japanese) (See Japanese page) 
(in English) For fast waveform generation in HMM-based speech synthesizers, a new method using a subband coding method that is also used in the MPEG Audio is proposed in this study. The proposed method is based on a filter bank-based speech synthesis where spectral features are built by combination of scaled band-decomposed source waveforms, and performed on a subband coding system with pre-decomposed and pre-coded source waveforms to reduce computational cost. Furthermore, sinusoidal synthesis directly performed on the subband coding system is also introduced to improve accuracy of spectral feature reproduction mainly in low frequency bands. Thus, no encoding part is necessary in speech synthesizers of the proposed method. In addition, a computation method for spectrum from cepstrum using discrete cosine transformation (DCT) used in the decoder of the subband coding is explained. The result of a subjective evaluation for resynthesized sounds showed that the mean opinion scores of sounds by the proposed method are superior to those by the conventional method using a mel log spectrum approximation (MLSA) filter.
Keyword (in Japanese) (See Japanese page) 
(in English) HMM-based speech synthesis / speech waveform generation / filter bank / subband coding / embedded systems / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 29, SP2013-15, pp. 85-90, May 2013.
Paper # SP2013-15 
Date of Issue 2013-05-09 (EA, SIP, SP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 EA2013-15 SIP2013-15 SP2013-15

Conference Information
Committee SP EA SIP  
Conference Date 2013-05-16 - 2013-05-17 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Speech and Acoustic Signal Processing, Speech, and Related Topics 
Paper Information
Registration To SP 
Conference Code 2013-05-SP-EA-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fast speech waveform generation using subband coding for speech synthesis 
Sub Title (in English)  
Keyword(1) HMM-based speech synthesis  
Keyword(2) speech waveform generation  
Keyword(3) filter bank  
Keyword(4) subband coding  
Keyword(5) embedded systems  
1st Author's Name Nobuyuki Nishizawa  
1st Author's Affiliation KDDI R&D Laboratories, Inc. (KDDI Labs)
2nd Author's Name Tsuneo Kato  
2nd Author's Affiliation KDDI R&D Laboratories, Inc. (KDDI Labs)
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Speaker Author-1 
Date Time 2013-05-17 09:45:00 
Presentation Time 25 minutes 
Registration for SP 
Paper # EA2013-15, SIP2013-15, SP2013-15 
Volume (vol) vol.113 
Number (no) no.27(EA), no.28(SIP), no.29(SP) 
Page pp.85-90 
Date of Issue 2013-05-09 (EA, SIP, SP) 

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