Synchronous Composition of Time Petri Nets as Models of Multimedia System
作为多媒体系统模型的时间Petri网的同步合成

A kind of time Petri nets are used to be models of multimedia systems in this paper. The underlying nets of this kind of time Petri nets arc occurrence nets. They are convenient to describe and analyze the synchronous problem between concurrent media streams. From the understanding of synchronization in multimedia systems, the concept of synchronization on time level and the concept of threshold of time distance for synchronization are presented. The threshold of time distance is a measure of synchronization on time level. The synchronous performance of synchronous transitions in a time Petri net model is divided to three classes according to the possibility of realizing the valid synchronization on time level and the decided conditions of this classification are given.