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

Volume

1

fYear

1992

fDate

23-26 Mar 1992

Firstpage

65

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on

Conference_Location

San Francisco, CA

ISSN

1520-6149

Print_ISBN

0-7803-0532-9

Type

conf

DOI

10.1109/ICASSP.1992.225971

Filename

225971