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SUMMARY:Perceptually motivated playout delay adaptation algorithm for VoIP
  network - Ying Zhang (University of Cambridge)
DTSTART:20080214T163000Z
DTEND:20080214T173000Z
UID:TALK10587@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:The statistical nature of data traffic and the dynamic routing
  techniques employed in IP networks results in a varying network delay (ji
 tter) experienced by the individual IP packets which form a VoIP flow. As 
 a result voice packets generated at successive and periodic intervals at a
  source will typically be buffered at the receiver prior to playback in or
 der to smooth out the jitter. However\, the additional delay introduced by
  the playout buffer degrades the quality of service. Thus\, the ability to
  forecast the jitter is an integral part of selecting an appropriate buffe
 r size. The use of playout delay adaptation algorithms in order to determi
 ne suitable delays is introduced during the speech playout process in orde
 r to mask this delay variation.\n\nWe consider time series prediction meth
 odologies for packet jitter and techniques to enhance the performance of t
 he overall playout process. We also consider the application of non-intrus
 ive speech quality estimation methodologies (such as ITU-T standard P563 a
 re based) in the process of playout delay adaptation.\n
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Builiding
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