High quality speech coding based on hybrid CELPC and VELPC techniques

Author

Kwong, S. ; Gang Wei ; Jing-Zheng Ouyang

Author_Institution

Dept. of Comput. Sci., City Polytech. of Hong Kong, Kowloon, Hong Kong

Volume

3

fYear

1993

fDate

19-21 Oct. 1993

Firstpage

291

Abstract

Code-excited linear predictive coding (CELPC) is now the main technique used to produce good quality speech at bit rates around 4.8 kbps. However, the original CELPC is impractical in most cases due to its heavy computational load. A hybrid CELPC and voice excited linear predictive coding (VELPC) scheme is presented in the paper for speech coding with lower complexity. In the algorithm, the speech signal is firstly divided into two parts, the base-band and the high-band respectively, in frequency domain, and then the base-band and the high-band signal are coded with CELPC and VELPC techniques respectively. The test experiments showed this new coder could produce synthesized speech with good quality at bit rates around 4.0 kbps.<>

Keywords

codecs; frequency-domain analysis; linear predictive coding; speech coding; speech synthesis; vocoders; 4.0 to 4.8 kbit/s; base-band; code-excited linear predictive coding; coder; computational load; frequency domain; high quality speech coding; high-band; hybrid CELPC and VELPC techniques; voice excited linear predictive coding; Bit rate; Computer science; Frequency; Linear predictive coding; Signal analysis; Signal generators; Signal synthesis; Speech analysis; Speech coding; Speech synthesis;

fLanguage

English

Publisher

ieee

Conference_Titel

TENCON '93. Proceedings. Computer, Communication, Control and Power Engineering.1993 IEEE Region 10 Conference on

Conference_Location

Beijing, China

Print_ISBN

0-7803-1233-3

Type

conf

DOI

10.1109/TENCON.1993.327979

Filename

327979