Title :
Derivation of efficient CELP coding algorithms using the Z-transform approach
Author :
Le Guyader, A. ; Di Francesco, R. ; Lamblin, C.
Author_Institution :
France Telecom, Lannion, France
Abstract :
A novel approach for minimizing the CELP (code excited linear prediction) error criterion in the Z-transform domain is presented. A covariance method and an autocorrelation method of CELP coding are derived using the Z-transform formulation. The intermediate signals in the excitation selection are interpreted in terms of digital filtering, (inter)correlations, spectra, and inner products. For each method, specific algebraic codebooks permit fast algorithms in the selection of the excitation signal, leading to low complexity CELP coders for high-quality narrowband (0-4 kHz) and wideband (0-7 kHz) speech coding at reduced bit rates
Keywords :
Z transforms; encoding; filtering and prediction theory; speech analysis and processing; 0 to 7 kHz; CELP coding algorithms; Z-transform approach; algebraic codebooks; autocorrelation method; code excited linear prediction; correlations; covariance method; digital filtering; excitation signal; inner products; low bit rate; narrowband coding; spectra; speech coding; wideband coding; Autocorrelation; Bit rate; Digital filters; Filtering; Linear predictive coding; Signal analysis; Signal synthesis; Speech analysis; Speech coding; Speech synthesis;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0003-3
DOI :
10.1109/ICASSP.1991.150314
