Structured codebook design in CELP
Abstract
Codebook Excited Linear Protection (CELP) is a popular analysis by synthesis technique for quantizing speech at bit rates from 4 to 6 kbps. Codebook design techniques to date have been largely based on either random (often Gaussian) codebooks, or on known binary or ternary codes which efficiently map the space of (assumed white) excitation codevectors. It has been shown that by introducing symmetries into the codebook, good complexity reduction can be realized with only marginal decrease in performance. Codebook design algorithms are considered for a wide range of structured codebooks.
- Publication:
-
International Mobile Satellite Conference
- Pub Date:
- 1990
- Bibcode:
- 1990imsc.conf..667L
- Keywords:
-
- Algorithms;
- Binary Codes;
- Bit Error Rate;
- Signal Encoding;
- Voice Communication;
- Channel Capacity;
- Excitation;
- Protection;
- Signal Processing;
- Communications and Radar