Enhanced waveform interpolative coding at low bit-rate

Author

Gottesman, Oded ; Gersho, Allen

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

Volume

9

Issue

8

fYear

2001

fDate

11/1/2001 12:00:00 AM

Firstpage

786

Lastpage

798

Abstract

This paper presents a high quality enhanced waveform interpolative (EWI) speech coder at low bit-rate. The system incorporates novel features such as optimization of the slowly evolving waveform (SEW) for interpolation, analysis-by-synthesis (AbS) vector quantization (VQ) of the SEW dispersion phase, dual-predictive AbS quantization of the SEW, efficient parameterization of the rapidly-evolving waveform (REW) magnitude, and VQ of the REW parameter, a special pitch search for transitions, and switched-predictive analysis-by-synthesis gain VQ. Subjective tests indicate that the 2.8 kb/s EWI coder´s quality exceeds that of G.723.1 at 5.3 kb/s, and it is slightly better than that of G.723.1 at 6.3 kb/s

Keywords

interpolation; optimisation; speech coding; vector quantisation; 2.8 kbit/s; EWI speech coder; REW magnitude; REW parameter; SEW dispersion phase; VQ; analysis-by-synthesis vector quantization; dual-predictive AbS quantization; enhanced waveform interpolative coding; interpolation; low bit-rate coding; optimization; parameterization; pitch search; rapidly-evolving waveform magnitude; slowly evolving waveform; switched-predictive analysis-by-synthesis gain VQ; Interpolation; Laboratories; Low earth orbit satellites; Low pass filters; Parameter estimation; Speech coding; Speech enhancement; Standardization; Testing; Vector quantization;

fLanguage

English

Journal_Title

Speech and Audio Processing, IEEE Transactions on

Publisher

ieee

ISSN

1063-6676

Type

jour

DOI

10.1109/89.966082

Filename

966082