Enhanced waveform interpolative coding at low bit-rate

被引:12
|
作者
Gottesman, O [1 ]
Gersho, A [1 ]
机构
[1] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA
来源
基金
美国国家科学基金会;
关键词
analysis-by-synthesis; phase dispersion; speech coding; speech compression; vector quantization; waveform interpolation; waveform interpolative coding;
D O I
10.1109/89.966082
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
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.
引用
收藏
页码:786 / 798
页数:13
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