Title :
Enhanced waveform interpolative coding at 4 kbps
Author :
Gottesman, Oded ; Gersho, Allen
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
Abstract :
This paper presents an enhanced waveform interpolative (EWI) speech coder at 4 kbps. The system incorporates novel features such as analysis-by-synthesis (AbS) vector-quantization (VQ) of the dispersion-phase, AbS optimization of the slowly evolving waveform (SEW), a special pitch search for transitions, and switched-predictive analysis-by-synthesis gain VQ. Subjective quality tests indicate that it exceeds that of MPEG-4 at 4 kbps and of G.723.1 at 5.3 kbps, and it is slightly better than that of G.723.1 at 6.3 kbps
Keywords :
interpolation; optimisation; phase coding; speech coding; vector quantisation; 4 kbit/s; EWI speech coder; SEW optimization; analysis-by-synthesis vector-quantization; dispersion-phase quantization; enhanced waveform interpolative coding; pitch search; slowly evolving waveform optimization; speech coding; subjective quality tests; switched-predictive analysis-by-synthesis gain VQ; Degradation; Electronic mail; Laboratories; Low pass filters; MPEG 4 Standard; Parameter estimation; Quantization; Robustness; Speech enhancement; System testing;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781494
