5th European Conference on Speech Communication and Technology

Rhodes, Greece
September 22-25, 1997

On Modeling Event Functions in Temporal Decomposition Based Speech Coding

Shahrokh Ghaemmaghami, Mohamed Deriche, Boualem Boashash

Signal Processing and Avionic Research Centre, Queensland University of Technology, Brisbane, Australia

Temporal Decomposition (TD) is an efficient technique for modeling speech spectral evolution through orthogonalization of the matrix of spectral parameters which reduces the amount of spectral information in TD-based speech coding. We have shown in earlier work that ``event'' functions can be approximated by fixed-width Gaussian functions with a minor degradation in the reconstructed speech, leading to further bit-rate reduction in such systems. In this paper, through perceptually-based spectral distortion measurement, we show the impact of events shape on the speech quality, and propose a new composite function and discuss its effect on the coder performance using different combinations of spectral parameters in event detection and speech synthesis.

Full Paper

Bibliographic reference.  Ghaemmaghami, Shahrokh / Deriche, Mohamed / Boashash, Boualem (1997): "On modeling event functions in temporal decomposition based speech coding", In EUROSPEECH-1997, 1299-1302.