Design of a variable rate algorithm for the 8 kb/s CS-ACELP coder

Author

Chung, Woo-Sung ; Kang, Sang-Won ; Sung, Ho-Sang ; Kim, Jae-Won ; Choi, Song-In

Author_Institution

Dept. of Control & Instrum. Eng., Hanyang Univ., Ansan, South Korea

Volume

3

fYear

1998

fDate

18-21 May 1998

Firstpage

2378

Abstract

In this paper, we propose an efficient variable rate algorithm for G.729. The variable rate algorithm consists of two main subjects, the rate determination algorithm and the design of sub rate coders. For the rate determination, we combine the energy-thresholding method, the phonetic segmentation method and the variable hangover period method. Through the analysis of noise features, a 1 kb/s sub rate coder is designed for coding the background noise signal. Also, we design a 4 kb/s sub rate coder for the unvoiced parts. Experiments show that the proposed variable rate conjugate structure-algebraic code excited linear prediction (CS-ACELP) coder produces the same speech quality as G.729, at the average bit rate of 4.4 kb/s

Keywords

algebraic codes; linear predictive coding; speech coding; variable rate codes; vocoders; 8 kbit/s; CS-ACELP speech coder; G.729; background noise signal; conjugate structure-algebraic code excited linear prediction; energy-thresholding method; noise features; phonetic segmentation method; rate determination algorithm; speech coding; speech quality; sub rate coders design; variable hangover period method; variable rate algorithm; Algorithm design and analysis; Background noise; Bit rate; Delay estimation; Electric variables control; Signal processing algorithms; Speech analysis; Speech coding; Speech synthesis; Telecommunication control;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1998. VTC 98. 48th IEEE

Conference_Location

Ottawa, Ont.

ISSN

1090-3038

Print_ISBN

0-7803-4320-4

Type

conf

DOI

10.1109/VETEC.1998.686184

Filename

686184