학술논문
CELP coding at 4.0 kb/sec and below: improvements to FS-1016
Document Type
Conference
Author
Source
[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on. 1:313-316 vol.1 1992
Subject
Language
ISSN
1520-6149
Abstract
While code excited linear prediction (CELP) speech coders can produce high levels of output speech quality at rates near 4 kb/s, they may not be suitable for toll quality communications. The authors propose several modifications to improve the quality of the standard CELP algorithm while simultaneously reducing its transmission rate. The modifications include a multimode excitation that increases the convergence rate of the adaptive (pitch) codebook. A low-complexity spectral vector quantization algorithm is also developed that reduces the coding rate and decreases the spectral distortion. SNR improvements of 2 dB and a significant reduction in perceptual artifacts have been observed.ETX