多媒体数据库系统中的同步表示管理

支持多媒体应用的扩展数据库系统必须具有新的机制以确保多种媒体数据流的同步表示。为了使用户同时具有多媒体数据流表示的灵活性和高效率，必须将媒体数据流分割成媒体对象，并且定义和保持其间的时间限制。为此要在现有数据库系统上采用能高效管理多媒体数据时间传性的新管理工具。文中讨论了多媒体数据库系统中同步表示管理。当考虑延迟的影响时，提出了多种媒体数据流同步表示的原则。基于这些原则，可以设计出各种同步机制。

Synchrouized Presentation Management in Multimedia Database System

The extension of database systems to support multimedia applications requires new mechanisms to ensure the synchronized presentation of multiple media data strearns. In order to flexibly and efficienily present multimedia data streams to users, media streams must be segInented into media objects and time constraintS among these objects must be specilied and maintained. New management tools to effectively manage the time-related charaterishc of multimedia data must thus be superimposed on existing database systems. In this paper, we discuss issues relevant to synchronized presentation management in muItimedia database systems. We present principles underlying the synchronized presentation of multiple media data streams when delay effects are considered. Various synchronization mechanisms can be designed based on the proposed principles.