Three new speech coders from the ITU cover a range of applications

Author

Cox, Richard V.

Author_Institution

AT&T Labs. Res., USA

Volume

35

Issue

9

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

40

Lastpage

47

Abstract

Many new speech coding standards have been created in the 10-year period 1987-1996. The author reviews the key attributes that determine what coder to select for different applications. The article then focuses on three new speech coding recommendations from the ITU-T, namely G.723.1, G.729, and Annex A of G.729. They provide good coverage for a wide range of applications that have low bit rate requirements (i.e., from 5.3 to 8 kb/s). In addition to bit rate, the article reviews their delay, complexity, and performance. Also reviewed are the history of these standards, and what considerations influenced the requirements each of these coders had to meet

Keywords

code standards; delays; speech coding; telecommunication standards; vocoders; 5.3 to 8 kbit/s; G.723.1; G.729; G.729 Annex A; ITU-T; complexity; delay; history; low bit rate; performance; speech coders; speech coding recommendations; speech coding standards; Bandwidth; Bit rate; Delay; Digital communication; Digital modulation; Phase change materials; Pulse modulation; Speech coding; Telephony; Vocoders;

fLanguage

English

Journal_Title

Communications Magazine, IEEE

Publisher

ieee

ISSN

0163-6804

Type

jour

DOI

10.1109/35.620524

Filename

620524