Title :
Source-driven packet marking for speech transmission over differentiated-services networks
Author :
De Martin, Juan Carlos
Author_Institution :
IRITI-CNR, Politecnico di Torino, Italy
Abstract :
We present a source-driven approach to packet marking for speech transmission over packet networks implementing the Differentiated Services model. Packets generated by the speech coder are examined: if deemed perceptually critical, they are marked as premium and sent on a "virtual wire;" otherwise, they are sent as regular best-effort traffic. Applied to speech coded with the ITU-T 8 kb/s speech coding standard G.729, the proposed source-driven packet marking scheme outperforms source-transparent techniques and provides clearly better perceptual quality than the unprotected case sending as little as 1/5 of the coded bitstream as premium traffic
Keywords :
Internet telephony; packet switching; speech coding; speech intelligibility; telecommunication traffic; voice communication; 8 kbit/s; G.729 standard; IP networks; ITU-T speech coding standard; QoS; VoIP; best-effort traffic; coded bitstream; differentiated services model; differentiated-services networks; formal subjective listening tests; packet networks; perceptual quality; premium traffic; source-driven packet marking; source-transparent techniques; speech coder; speech transmission; virtual wire; voice over IP; Bandwidth; Code standards; Diffserv networks; Electronic mail; Protection; Quality of service; Speech coding; Streaming media; Telecommunication traffic; Testing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.941024
