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Alexandros Eleftheriadis, Sassan Pejhan, Dimitris Anastassiou. Architecture and Algorithms of the Xphone Multimedia Communication System. Multimedia Systems Journal, 2(2):89-100, August 1994.

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We describe the architecture and the algorithms used in Columbia University's "Xphone" multimedia communication system. The system assumes a "best-effort" operating system and network and provides facilities for call management, intra-application scheduling for support of continuous dataflow and integration with the windowing system, and synchronized video/audio acquisition/playback (locally or across a network) with minimized and bounded end-to-end delay. Synchronization is achieved using an algorithm based on time-stamps and device state information. The effects of jitter (delay variation) are mitigated using silence detection; the end-to-end delay is kept bounded using a restart mechanism. Finally, for live video sources, we describe a source bit-rate adaptation algorithm that maximizes the video image quality to the available network bandwidth and video display window size

BibTex Reference

   Author = {Eleftheriadis, Alexandros and Pejhan, Sassan and Anastassiou, Dimitris},
   Title = {Architecture and Algorithms of the Xphone Multimedia Communication System},
   Journal = {Multimedia Systems Journal},
   Volume = {2},
   Number = {2},
   Pages = {89--100},
   Month = {August},
   Year = {1994}

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