Title :
CELP coding with an adaptive density pulse excitation model
Author :
Akamine, Masami ; Miseki, Kimio
Author_Institution :
Toshiba Res. & Dev. Center, Kawasaki, Japan
Abstract :
An approach to dynamic bit-allocation to excitation vectors to improve the performance of a code excited linear prediction (CELP) coder is proposed. The method is based on an adaptive density pulse (ADP) excitation. By using the ADP, bit-allocation to the excitation vector can be easily varied. Also, the number of samples of excitation can be reduced. The effects of the ADP parameters on the synthetic speech quality are discussed. The ADP-CELP coder is described. The benefit of introducing the ADP excitation model to the CELP coder is evaluated. The segmental signal-to-noise ratio gains of the ADP-CELP coder over the conventional CELP are about 2 dB both at 8 kbit/s and at 4.8 kbit/s
Keywords :
bandwidth compression; encoding; speech analysis and processing; speech intelligibility; 4.8 kbit/s; 8 kbit/s; ADP-CELP coder; CELP coding; adaptive density pulse excitation; adaptive density pulse excitation model; dynamic bit-allocation; excitation vectors; signal-to-noise ratio gains; synthetic speech quality; Distortion measurement; Filters; Linear predictive coding; Signal synthesis; Signal to noise ratio; Speech; Speech analysis; Speech coding; Speech synthesis; Stochastic processes; Vectors; Weight measurement;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.115529
