Realtime implementation algorithm of CELP at 4.8 kb/s

Author

Liu, Z. Yong ; Zhu, W. Ming

Author_Institution

Dept. of Telecommun. Eng., Beijing Univ. of Posts & Telecommun., China

fYear

1991

Firstpage

1731

Abstract

A new kind of vector-excited speech coder, the pulse adaptive vector excited speech coder (PAVX), is proposed. The codebook of PAVX is obtained by a varying-threshold clustering algorithm using regular-pulse excitation sequences obtained from speech data. The optimal excitation search procedures become simple when a pulse adaptive method is used in matching the codebook. Moreover, the codebook efficiency of PAVX is four times as much as the basic CELP codebook. The computer simulation results show that at 4.8 kb/s, PAVX can produce a clear natural-sounding synthetic speech. This algorithm was implemented on one TMS320C25

Keywords

encoding; filtering and prediction theory; speech analysis and processing; 4.8 kbit/s; CELP real-time implementation; TMS320C25; clear natural-sounding synthetic speech; code excited linear prediction; codebook efficiency; optimal excitation search; pulse adaptive vector excited speech coder; regular-pulse excitation sequences; varying-threshold clustering algorithm; Bit rate; Computational complexity; Delay; Filtering; Filters; Linear predictive coding; Redundancy; Signal synthesis; Speech synthesis; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1991. ICC '91, Conference Record. IEEE International Conference on

Conference_Location

Denver, CO

Print_ISBN

0-7803-0006-8

Type

conf

DOI

10.1109/ICC.1991.162295

Filename

162295