排序方式: 共有87条查询结果,搜索用时 15 毫秒
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校园网网络直播系统设计 总被引:1,自引:0,他引:1
于雷 《数字社区&智能家居》2014,(4):2385-2387
在分析校园网网络直播系统的需求基础上,进行了网络直播系统方案设计,阐述了系统实现的关键技术。 相似文献
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刘灵辉 《数字社区&智能家居》2009,(24)
视频点播服务是一种新的信息服务。作为信息服务运营商,电信需要构建电信级的视频点播系统以便有效提供电信级视频点播服务。针对电信级视频点播服务的设计需求,本文提出了一个电信级视频点播层次型分布式系统架构,并在该架构下,整合视频服务子系统、容错子系统、节目管理子系统、节目分发子系统、节目采编子系统、用户认证计费系统和网管子系统等七大功能系统,完整地实现了一个电信级视频点播系统,最终实现了城域范围内的视频点播服务。 相似文献
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对于一部长为D分钟的电影,若想把观众的等待时间减少到D/2^N分种,则只需周期性地分配H(N)个视频信道。这种改进Harmonic点播方案大大地减少了信道带宽。 相似文献
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大规模层次化视频点播存储系统的设计与管理 总被引:6,自引:0,他引:6
近来计算机和通信技术的发展使得视频点播(video-on-demand,简称VOD)在技术和经济上成为可能.连续媒体的特性使得VOD系统需要大规模的存储服务器.层次化存储体系是减少系统费用的合理方案.文章提出了一种层次化的存储模型和磁盘cache的概念.根据这个模型,提出了基于访问频率的替换算法,并对算法的有效性进行了模拟和分析.结果表明,这种算法解决了LFU(least frequently used)算法中的“cache污染”(cache pollution)问题,能较好地适用于连续媒体数据应用. 相似文献
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Tsz-Mei Ko Bo Hu Donghui Qu Ming Liou Roger Cheng Kwan F. Cheung 《International Journal of Communication Systems》1998,11(3):175-181
It is becoming popular that both residential and commercial buildings in a densely populated urban city have fibre cables laid from a central office to the basement of the building. Category 5 twisted pairs are then used for in-building distribution. This paper introduces a pre-emphasis filter system to distribute MPEG-2 videos within a building using category 5 twisted pairs. A novel technique is used to identify the frequency response of a twisted pair cable to obtain the necessary preamplification at the transmitter. Simulation results are obtained for both conventional and fractional tap-line pre-emphasis filters for a 1000 ft category 5 twisted pair. The proposed system can be used by telecom companies to provide video-on-demand, internet connection and other interactive multimedia services. The system can also be utilized by hotels, hospitals, recreation centres and corporations to deploy their private intranets, VOD and multimedia information systems. © 1998 John Wiley & Sons, Ltd. 相似文献
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The system architecture of the Stony Brook Video Server (SBVS), which guarantees end-to-end real-time video playback in a client-server setting, is presented. SBVS employs a real-time network access protocol, RETHER, to use existing Ethernet hardware as the underlying communications media. The video server tightly integrates the bandwidth guarantee mechanisms for network transport and disk I/O. SBVS's stream-by-stream disk scheduling scheme optimizes the effective disk bandwidth without incurring significant scheduling overhead. To demonstrate the feasibility of the proposed architecture, we have implemented a prototype called SBVS-1, which can support five concurrent MPEG-1 video streams on an Intel 486DX2/EISA PC. To our knowledge, this system is the first video server that provides an end-to-end performance guarantee from the server's disks to the each user's display over standard Ethernet. This paper describes the implementation details of integrating network and I/O bandwidth guarantee mechanisms, and the performance measurements that drive and/or validate our design decisions. © 1997 by John Wiley & Sons, Ltd. 相似文献