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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(4):1222-1225; doi:10.1093/ietfec/e91-a.4.1222
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Letters -- Speech and Hearing

An Enhanced Distortion Measure Based VBR for Waveform Interpolative Speech Coders

Heesik YANG1, Sangbae JEONG1 and Minsoo HAHN1

1 The authors are with Info. and Commun. Univ., Daejeon, 305-732 Korea. E-mail: sheik{at}icu.ac.kr


  Abstract

In our previous study, a distortion measure based variable bit rate (DM-VBR) scheme in waveform interpolation (WI) coders was proposed. In this paper, the repetition method is proposed to estimate non-transmitted parameters instead of the extrapolation method. For the further reduction of slowly evolving waveform (SEW) bit rates, the dimensions of the past parameters, which are different from those of the current parameters, are converted to match the dimension of the current ones. Distortions between interpolated sub-frames and original sub-frames are measured for the reduction of the SEW parameters. And the usefulness of several other distortion measures is also investigated instead of the simple log spectral distortion. Experimental results show that the coder adopting the new schemes offers above 41% bit rate reduction with almost unnoticeable output speech degradation.

Key Words: waveform interpolation,VBR or multimode

Manuscript received June 4, 2007. Manuscript revised October 22, 2007.


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