Open Access

Model-Based Speech Signal Coding Using Optimized Temporal Decomposition for Storage and Broadcasting Applications

  • Chandranath R. N. Athaudage1Email author,
  • Alan B. Bradley2 and
  • Margaret Lech3
EURASIP Journal on Advances in Signal Processing20032003:653129

https://doi.org/10.1155/S1110865703304056

Received: 27 May 2002

Published: 8 September 2003

Abstract

A dynamic programming-based optimization strategy for a temporal decomposition (TD) model of speech and its application to low-rate speech coding in storage and broadcasting is presented. In previous work with the spectral stability-based event localizing (SBEL) TD algorithm, the event localization was performed based on a spectral stability criterion. Although this approach gave reasonably good results, there was no assurance on the optimality of the event locations. In the present work, we have optimized the event localizing task using a dynamic programming-based optimization strategy. Simulation results show that an improved TD model accuracy can be achieved. A methodology of incorporating the optimized TD algorithm within the standard MELP speech coder for the efficient compression of speech spectral information is also presented. The performance evaluation results revealed that the proposed speech coding scheme achieves 50%–60% compression of speech spectral information with negligible degradation in the decoded speech quality.

Keywords

temporal decompositionspeech codingspectral parametersdynamic programmingquantization

Authors’ Affiliations

(1)
ARC Special Research Center for Ultra-Broadband Information Networks (CUBIN), Department of Electrical and Electronic Engineering, The University of Melbourne
(2)
Institution of Engineers Australia
(3)
School of Electrical and Computer System Engineering, Royal Melbourne Institute of Technology (RMIT) University

Copyright

© Copyright © 2003 Hindawi Publishing Corporation 2003