Title :
A new excitation model for LPC vocoder at 2.4 kb/s
Author :
Xiongwei, Zhang ; Xianzhi, Chen
Author_Institution :
Nanjing Inst. of Commun. Eng., China
Abstract :
A novel excitation model called the multicategory vector excitation (MCVE) model for a linear predictive coding (LPC) vocoder at 2.4 kb/s is proposed. In this model, speech signal is classified into four categories: unvoiced, voiced, onset, and offset. For every category of speech, an excitation codebook is available. Different excitation codebooks hold different characteristics. The analysis-by-synthesis procedure is used to select the excitation vectors. The computer simulation has been carried out, and the results show that the vocoder with the new excitation model is capable of synthesizing more intelligible and more natural speech at 2.4 kb/s
Keywords :
linear predictive coding; speech coding; vocoders; 2.4 kbit/s; LPC vocoder; analysis-by-synthesis procedure; excitation codebook; excitation model; excitation vectors; linear predictive coding; multicategory vector excitation; offset excitation; onset excitation; speech coding; speech signal; unvoiced excitation; voiced excitation; Bandwidth; Distortion measurement; Linear predictive coding; Military communication; Narrowband; Natural languages; Speech analysis; Speech synthesis; Vectors; Vocoders;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-0532-9
DOI :
10.1109/ICASSP.1992.225971
