Title :
Complexity reduction of CELP speech coders through the use of phase information
Author :
Ramabadran, Tenkasi V. ; Lueck, Charles D.
Author_Institution :
Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
An efficient search procedure for CELP coders is described. Based on the phase spectra of the codevectors and the ideal excitation vector, a subset of the codebook is preselected. This subset is then exhaustively searched to find the best, perhaps optimum, codevector. Computational savings of the order of 30-40 are achieved while still maintaining good output speech quality
Keywords :
computational complexity; linear predictive coding; search problems; speech coding; vocoders; CELP; codebook subset; codevectors; efficient search procedure; ideal excitation vector; output speech quality; phase information; phase spectra; search complexity reduction; speech coding; Bit rate; Code standards; Computational complexity; Decoding; Filtering; Frequency domain analysis; Nonlinear filters; Robustness; Speech analysis; Speech coding;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.1994.577024
