A hybrid wavelet-binary pulse excitation approach for high quality CELP speech coding

Author

Ancin, F.J. ; Larreategui, M. ; Burrows, B.L. ; Carrasco, R.A.

Author_Institution

Sch. of Eng., Staffordshire Univ., UK

fYear

1994

fDate

1994

Firstpage

42370

Lastpage

42375

Abstract

A hybrid wavelet-binary pulse excitation (WBPE) model for CELP speech coding is reported. The WBPE arises as the result of some preliminary experiments, for modelling the residual predictive error using a wavelet modelling process. In a general WBPE model, the excitation is modelled as a combination of the long-term prediction signal and wavelet functions spaced by the optimum closed-loop pitch distance and located using the pitch adaptive codebook approach. Finally, a constrained stochastic excitation is added using a binary codebook. The initial results of an example of the WBPE targeted at 6.3 kb/s are also compared with the conventional CELP coder at 8 kb/s using Gaussian, sparse and ternary codebook population

Keywords

linear predictive coding; speech coding; speech intelligibility; wavelet transforms; 6.3 kbit/s; 8 kbit/s; CELP; Gaussian codebook population; binary codebook; closed-loop pitch distance; constrained stochastic excitation; long-term prediction signal; pitch adaptive codebook; sparse codebook; speech coding; speech quality; ternary codebook population; wavelet functions; wavelet modelling; wavelet-binary pulse excitation;

fLanguage

English

Publisher

iet

Conference_Titel

Techniques for Speech Processing and their Application, IEE Colloquium on

Conference_Location

London

Type

conf

Filename

369650