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The Research of Multimedia Dynamic Synchronization Model Based on Timed Petri Net and Control Mechanism

Author: LuXuanMin
Tutor: ShiHaoShan
School: Northwestern Polytechnical University
Course: Circuits and Systems
Keywords: Distributed multimedia systems Dynamic synchronization QoS Tense model Time Petri Nets Synchronization performance model Multimedia communications Channel allocation Synchronous communication model Delay estimation Leaky Bucket Algorithm Adaptive Synchronization Control
Type: PhD thesis
Year: 2002
Downloads: 162
Quote: 3
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Multimedia synchronization is the key technology and infrastructure of distributed multimedia systems, multimedia synchronization relations exist in the entire life cycle of multimedia. This article studies the complex distributed multimedia systems, multimedia has tense relations and dynamic synchronization features, as well as key media application to enjoy the synchronization priority;-depth study of the transmission characteristics of multimedia communication process and multimedia objects, synchronization needs, as well as synchronous communication program channel allocation and synchronous transmission scheduling algorithm;-depth study of the problem of the actual packet switched network multimedia synchronization control mechanism. To sum up, this article made the following findings: 1. Starting from the theory of time and temporal logic approach, combined with the dynamic characteristics of multimedia performance, and extended set of multimedia systems determine the time slice relationship derived by analyzing the derivation, and is reduced to only six operator norms very intuitive multimedia the tenses model. 2. Built in multimedia systems tense relationship extended set based on the the TPN network model described prove that the synchronization between any number of media objects can use the the TPN network model to express. 3. Proposed a new dynamic TPN network-based interactive multimedia synchronization model IDSM the model fully take into account the multimedia synchronous dynamic characteristics in the distributed environment, as well as key media priorities and human-computer interaction requirements, through the introduction of permissible blocking time, backtracking algorithm overcome network random delay, the impact of factors such as congestion and packet loss, formal complete, accurate description of the time behavior of the multimedia information flow. 4. Depending on the IDSM model, proposed a new optimized channel allocation scheme and on this basis, synchronous communication control model DSCM, including the model and customer server DSCM DSCM model. 5. Leaky bucket algorithm-based adaptive multimedia synchronization control program, which the media unit timestamp, dynamic estimation of delay and delay jitter to keep abreast of changes in the network load. When the monitoring to the deterioration of the quality of real-time media playback, using the estimated results, appropriately adjusting the timing of the playback of the multimedia object, in order to achieve the purpose of re-synchronize and maintain the playback quality.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Multimedia technology and multimedia computer
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