Title :
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
fDate :
10/1/2009 12:00:00 AM
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;
Journal_Title :
Communications Magazine, IEEE
DOI :
10.1109/MCOM.2009.5273820
