Title :
Performance comparison between VBR speech coders for adaptive VoIP applications
Author :
Beritelli, F. ; Casale, S. ; Ruggeri, G.
Author_Institution :
Dipt. di Ingegneria Inf. e delle Telecomunicazioni, Catania Univ., Italy
Abstract :
The introduction of new variable bit rate (VBR) speech coders has opened up new perspectives for the implementation of adaptive voice over IP (AVoIP) systems. The paper compares different VBR speech coding techniques in a scenario in which the rate of the single sources is dynamically adapted to the workload conditions. The coders compared are the AMR, the M/sup 3/ R and the G.729. Using source and rate control mechanism models, performance is evaluated in terms of loss probability, offered throughput and mean CMOS with varying numbers of sources. The use of header compression mechanisms is also evaluated.
Keywords :
Internet telephony; speech coding; telecommunication control; variable rate codes; AMR coder; AVoIP; G.729 coder; M/sup 3/ R coder; VBR speech coders; adaptive VoIP applications; adaptive voice over IP; header compression mechanisms; loss probability; mean CMOS; offered throughput; performance comparison; rate control mechanism model; source control mechanism model; variable bit rate speech coders; workload conditions; Bit rate; Codecs; Diffserv networks; Internet telephony; Proposals; Quality of service; Semiconductor device modeling; Speech coding; Telecommunication traffic; Traffic control;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.957382
