Variable rate speech coding with phonetic segmentation

Author

Paksoy, Erdal ; Srinivasan, K. ; Gersho, Allen

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

Volume

2

fYear

1993

fDate

27-30 April 1993

Firstpage

155

Abstract

A speech coder based on variable rate phonetic segmentation (VRPS), operating at an average rate of 3 kbit/s and applicable to code division multiple access (CDMA) digital cellular systems, is presented. An improved version of the voice activity detection scheme used in the GSM (Group Special Mobile) full-rate cellular standard tracks the bursty character of active speech. Each frame of active speech is classified into one of a set of four phonetic categories. A distinct coding configuration and bit-rate are applied to each category. The tradeoff between subjective quality and average bit rate of VRPS for both clean speech and speech corrupted with vehicle noise is superior to that obtained by QCELP, a proposed TIA speech coding standard for wideband digital cellular networks. The average bit-rate of VRPS is generally lower than that of QCELP for the same input signals.<>

Keywords

broadband networks; cellular radio; code division multiple access; code standards; digital radio systems; speech coding; GSM; active speech; code division multiple access; digital cellular systems; phonetic categories; speech coder; speech coding standard; variable rate phonetic segmentation; vehicle noise; voice activity detection scheme;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1993. ICASSP-93., 1993 IEEE International Conference on

Conference_Location

Minneapolis, MN, USA

ISSN

1520-6149

Print_ISBN

0-7803-7402-9

Type

conf

DOI

10.1109/ICASSP.1993.319256

Filename

319256