ITU-T G.729.1 scalable codec for new wideband services

Author

Varga, Imre ; Proust, Stéphane ; Taddei, Hervé

Author_Institution

Qualcomm Inc., San Diego, CA, USA

Volume

47

Issue

10

fYear

2009

fDate

10/1/2009 12:00:00 AM

Firstpage

131

Lastpage

137

Abstract

G.729.1 is a scalable codec for narrowband and wideband conversational applications standardized by ITU-T Study Group 16. The motivation for the standardization work was to meet the new challenges of VoIP in terms of quality of service and efficiency in networks, in particular regarding the strategic rollout of wideband service. G.729.1 was designed to allow smooth transition from narrowband (300-3400 Hz) PSTN to high-quality wideband (50-7000 Hz) telephony by preserving backward compatibility with the widely deployed G.729 codec. The scalable structure allows gradual quality increase with bit rate. A low-delay mode makes the coder especially suitable for high-quality speech communication. The article presents the standardization goals and process, an overview of the coding algorithm, and the codec performance in various conditions.

Keywords

Internet telephony; broadband networks; codecs; quality of service; telecommunication standards; ITU-T G.729.1 scalable codec; ITU-T Study Group 16; VoIP; backward compatibility; bit rate; coding algorithm; high-quality speech communication; low-delay mode; narrowband conversational applications; quality of service; telephony; wideband conversational applications; wideband services; Bandwidth; Bit rate; Codecs; Delay; Floating-point arithmetic; Narrowband; Scalability; Speech; Switches; Wideband;

fLanguage

English

Journal_Title

Communications Magazine, IEEE

Publisher

ieee

ISSN

0163-6804

Type

jour

DOI

10.1109/MCOM.2009.5273820

Filename

5273820