| 扩展时间流Petri网多媒体同步模型 |
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| 引用本文： | 单志广,杨扬,王任,于兴业. 扩展时间流Petri网多媒体同步模型[J]. 计算机研究与发展, 2000, 37(2): 223-227 |
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| 作者姓名： | 单志广 杨扬 王任 于兴业 |
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| 作者单位： | 北京科技大学信息工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金项目!（项目编号69873012），国家“八六三”高技术研究发展计划基金项目!（项目编号863－306－ZT05－ |
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| 摘 要： | 多媒体同步的一个主要问题是多媒体同步时间要求的描述与建模。文中基于时间流Ｐｅｔｒｉ网模型（ＴＳＰＮ），通过分析ＴＳＰＮ模型的不足之处，提出了一种新的多媒体同步模型－－扩展时间流Ｐｅｔｒｉ网模型（ＳＴＳＰＮ），ＳＴＳＰＮ不但可以完全、准确地描述媒体流内和流间的时间行为，而且通过引入容许阻塞时间、问题算法等对ＴＳＰＮ进行扩展，可以有铲地克服网络随机延迟、阻塞和丢包等因素的不良影响，提高了模型的建模能力
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| 关 键 词： | 多媒体同步 同步模型 Petri网 信息处理 |
EXTENDED TIME STREAM PETRI NETS: A MULTIMEDIA SYNCHRONIZATION MODEL BASED ON TSPN |
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| SHAN Zhi-Guang,YANG Yang,WANG Ren,YU Xing-Ye. EXTENDED TIME STREAM PETRI NETS: A MULTIMEDIA SYNCHRONIZATION MODEL BASED ON TSPN[J]. Journal of Computer Research and Development, 2000, 37(2): 223-227 |
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| Authors: | SHAN Zhi-Guang YANG Yang WANG Ren YU Xing-Ye |
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| Affiliation: | SHAN Zhi-Guang, YANG Yang, WANGRen,YU Xing-Ye;(Information Engineering School, University of Science and Technology Beijing, Beijing100083) |
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| Abstract: | Modeling and specifying temporal requirements of the multimedia synchronization is a key issue for distributed multimedia applications. This paper aims to overcome the deficiencies of time stream Petri net (TSPN) in modeling multimedia streams synchronization. Based on TSPN, a new multimedia synchronization model, extended time stream Petri net (XTSPN), is proposed. XTSPN also allows the temporal behavior of both intra|media and inter|media to be fully, accurately, and formally described. In particular, XTSPN introduces allowed blocking time, backtracking rules and so on to handle the problem of synchronization failure because of fire interruption caused by random delay, blocking or lost packets. XTSPN is more practical when the condition of distributed network is imperfect. |
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| Keywords: | multimedia synchronization time stream Petri net synchronization model |
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