TY  - JOUR
T1  - Enhanced waveform interpolative coding at low bit-rate.
JF  - IEEE Transactions on speech and audio processing
A1  - Gottesman, O.
LA  - English
UL  - https://tuklas.up.edu.ph/Record/UP-99796217609583665
AB  - 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
KW  - 2.8 kbit/s.
KW  - EWI speech coder.
KW  - REW magnitude.
KW  - REW parameter.
KW  - SEW dispersion phase.
KW  - VQ.
KW  - Analysis-by-synthesis vector quantization.
KW  - Dual-predictive AbS quantization.
KW  - Enhanced waveform interpolative coding.
KW  - Interpolation.
KW  - Low bit-rate coding.
KW  - Optimization.
KW  - Parameterization.
KW  - Pitch search.
KW  - Rapidly-evolving waveform magnitude.
KW  - Slowly evolving waveform.
KW  - Switched-predictive analysis-by-synthesis gain VQ.
ER  -