Title :
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
fDate :
11/1/2001 12:00:00 AM
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;
Journal_Title :
Speech and Audio Processing, IEEE Transactions on
