摘要
本文在对同步信息进行分类和分析的基础上 ,分析了OCPN模型的局限性 ,提出了改进的多媒体同步模型ROCPN。通过在节点中引入媒体表现时间和同步时间 ,将媒体的表现与媒体间的同步行为分开 ,该模型解决了OCPN模型关于媒体内同步与媒体间同步不可兼得的问题。模拟实验表明 ,使用ROCPN模型的多媒体流其媒体流内同步指标和媒体流间同步指标均明显优于使用OCPN模型的多媒体流 ,尤其当对象丢失率较高时 。
The disadvantage of OCPN is pointed out with analysis of synchronization information,and a augmented OCPN model named ROCPN is proposed.By introducing presentation duration and synchronization time to each place,the model process presentation and synchronization of media objects separately.Therefore ROCPN can keep synchronization between different media flows,without losing continuity of each media flow.Furthermore,ROCPN is robust for loss of objects in some extent and can effectively avoid long time disparity of media synchronization.The simulation shows that the parameters of intro media synchronization and inter media synchronization of multimedia flows using ROCPN both are much better than the ones using OCPN,especially in case of high loss rate of media objects.
出处
《通信学报》
EI
CSCD
北大核心
2000年第2期7-14,共8页
Journal on Communications
基金
国家自然科学基金资助项目!(6 96 72 0 14)
国家九五重点科技基金资助项目!(96 74 3 0 1 0 6 0 3)
关键词
实时多媒体
同步模型
PETRI网
realtime multimedia communication
multimedia synchronization model
timed petri net
