Paradigms and Protocols for Real-Time Digital Video and Audio Services in Distributed Computing Systems

随着网络和存储设备开始提供 高容量的分布式系统可以支持通信 以及数字视频和音频域中的文件服务。 的 项目研究多媒体的范例和协议 支持可视/语音对话并允许 转换站的部件的选择性存储/检索。 会议被用作访问任何 多媒体服务 例如，要检索数字视频， 客户端建立与视频文件服务的对话; 记录对话的一部分，文件服务作为一方加入 把它变成一个会议;因为 娱乐在空闲期间，客户端加入后台 与HDTV服务的会议。 该项目正在开发 精确的模型和连接管理机制， 强大的多层次多渠道会议模式。 该项目使用会话文件系统进行存储/ 多媒体数据的检索。 文件系统处理千兆字节 文件大小和处理媒体间同步。 多媒体 通信需要提供性能的协议 保证，并支持多媒体流，同时保留 流之间的时间关系。 项目 研究此类协议和算法的设计， 将资源分配给性能保证的信道。 的 研究的成果是软件体系结构，协议， 这些算法将使多媒体计算系统能够 取代现实世界的服务，如物理邮件，电话， 新闻、广告和视频/音频娱乐。

With networks and storage devices beginning to offer very high capacities, distributed systems can support communication and file services in the digital video and audio domains. The project investigates paradigms and protocols for multi-media services that support visual/voice conversations and allow selective storage/retrieval of parts of a converstation. Conferencing is used as the basic paradigm for accessing any multi-media service. For instance, to retrieve digital video a client establishes a conversation with the video file service; to record parts of a conversation, the file service joins as a party to the conversation transforming it into a conference; for entertainment during idle periods, a client joins a background conference with the HDTV service. The project is developing precise models and connection management mechanisms for a powerful multi-level multi-channel conferencing paradigm. The project uses conversational file systems for storage/ retrieval of multi-media data. The file systems handle gigabyte file sizes and handle inter-media synchronization. Multi-media communication requires protocols that provide performance guarantees, and support multiple media streams while preserving temporal relationships among the streams. The project investigates the design of such protocols and algorithms for allocation of resources to performance guaranteed channels. The outcome of the research is software architectures, protocols, and algorithms that will enable multi-media computing systems to replace real-world services such as physical mail, telephony, news, advertising and video/audio entertainment.