Title :
Improved CELP coding using adaptive excitation codebooks
Author :
Kipper, U. ; Reininger, H. ; Wolf, D.
Author_Institution :
Inst. fuer Angewandte Phys., Frankfurt am Main Univ., Germany
Abstract :
The authors present a novel method for improving the speech quality of CELP (code excited linear prediction) schemes at low bit rates using an excitation sequence with a locally adapted number of pulses. The design of this adaptive CELP scheme for a data rate of 4.8 kb/s is described. The improvement of the performance as compared to that of a conventional 4.8 kb/s CELP scheme in terms of signal-to-noise ratio is about 3 dB. Due to the significantly reduced roughness, in particular in voiced segments, the processed speech sounds more clear and natural independently of the speaker
Keywords :
encoding; filtering and prediction theory; speech analysis and processing; 4.8 kbit/s; CELP coding; adaptive excitation codebooks; code excited linear prediction; low bit rates; signal-to-noise ratio; speech coding; speech quality; Adaptive filters; Bit rate; Encoding; Equations; Loudspeakers; Quantization; Signal synthesis; Speech coding; Speech processing; 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.1991.150321
