共查询到20条相似文献,搜索用时 125 毫秒
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《中国无线电电子学文摘》2003,(4)
TN93 2003041598HDTv/SDTv节目传输流播放机设计/吕卫,俞斯乐(天津大学)11电子测量技术.一2003,(l)一n一12文中介绍一种HDTV/SDTV节目传输流播放机的设计与实现方法.既提供了传输流播放机的核心硬件部分的总体结构及其功能模块的实现方法;又阐明了软件设计的要点.所研制的设备具有工作稳定、扩展性好、操作简便、成本较低等特点,并已得到实际应用.图3参2(木)动态聚焦技术是为了改善显象管或投影管的边缘聚焦质量,动态的对屏幕中央及四周的聚焦差异进行补偿,从而达到提高整体分辨率的目的.作者针对双束投影管测试台的要求,设计了其中… 相似文献
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7.高、标清高码混合编辑和以往代理码率编辑设计理念不同,亚运系统使用的是原(高)码率编辑模式,选用DNxHD120M、MPEG-LongGop50M、Avc-Intro100M三种编码作为高清主编码格式,选用MPEG-2IBP25M作为标清主编码格式,实现高标清混合格式全高码节目制作,保证用户体验"所见即为 相似文献
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介绍了针对数字电视运营商为数字电视节目存储和播出的需求而提出的创新解决方案,在节目采集、编辑、存储和管理以及发布的整个环节,全程采用传输流处理.该系统实现了与制作系统和数字电视播出系统的互联互通. 相似文献
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Zhang Yinghui Tao Ran Wang Yue Zhou Siyong 《电子科学学刊(英文版)》2006,23(2):295-297
A comprehensive research on key issues of the large-scale video server system for Video On Demand (VOD) client/server system is conducted based mainly on real time (rt)/non-real time (nrt) Variable Bit Rate or Constant Bit Rate (VBR/CBR) MPEG-2 MP@ML Signal Program Transport Stream (SPTS) for movies, and general architecture for storage, control, caching subsystems from Loosely Coupled Computer (LCC), Symmetric Multiple Processing (SMP), and Massively Parallel Processing (MPP) video server is conceptualized. Meanwhile, Redundant Array of Inexpensive Disks (RAID) storage system are presented and the centralized FCP/SAN huge storage technology is introduced in terms of its scalability, throughput, and connectivity performances. 相似文献
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介绍了一种接收解码器,它是一种广泛应用于三网融合的信源接收设备,它可以将接收到的MPTS多节目传输流转换为多个SPTS单节目传输流,并且通过TS OVER IP的形式将各个节目分别输出到不同的IP主机或端口.详细介绍了整个系统各个模块的功能和实现过程. 相似文献
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Packet Transport Networks (PTN) combine the advantages of packet technology and Synchronous Digital Hierarchy (SDH) technology.Taking the packet switch as its core, PTN has a high statistical multiplexing ability, which allows it to become a more efficient packet transfer service. Its strong Operation Administration and Maintenance (OAM)-similar to SDH and carrier-class security protection services-ensures efficient mobile backhaul business management and transmission quality. MPLS Transport Profile (MPLS-TP) packet transport network eliminates connectionless features, such as Penultimate Hop Popping (PHP), label merge and Equal-cost multi-path (ECMP), and is enhanced in terms of OAM, protection, and synchronization. This is ideally suited for carrying IP-based mobile backhaul services and key account services. PTN, original Multi-Service Transport Platform (MSTP), Metro Ethernet, and IP over Wave Division Multiplexing (WDM)/Optical Transport Network (OTN) of organic complexes, contribute to an "all IP" era of telecommunications services. 相似文献
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DTLS(Datagram Transport Layer Security)协议是TLS协议的变体,用于在不可靠传输网络上对应用层数据提供安全保护.文中介绍了DTLS协议,提出一种基于DTLS协议的应用层VPN解决方案,并进行了仿真. 相似文献
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A solution to the lack of interoperability between the U.S. Department of Defense (DoD) data communications standards and the NATO standards based on the International Organization for Standardization concept for open systems interconnection is presented. The solution is based on conversion between a common subset of the US DoD Transmission Control Protocol and the ISO Class 4 Transport Protocol at the Transport layer, which is the first layer offering any end-to-end service. 相似文献
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文章先给出了基于SIP(会话初始化协议)的Internet电话的协议结构,随后对其中传输数据的RTP(实时传输协议)和RTCP(实时传输控制协议)进行了介绍和分析,并对会话初始化协议的组成实体、命名、寻址、操作进行了详细的论述。 相似文献
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分组传送网的环保护和生存机制 总被引:1,自引:1,他引:0
在保护和恢复机制方面,分组传送网络面临运行操作与维护(OAM)检测性能、网络资源优化、资源分配死锁、资源部署阻塞等众多挑战。传统的保护和恢复机制已不能满足分组传送网络的需求。为了提高分组传送网络保护恢复性能、网络资源的利用率、业务恢复可能性,减少业务部署的阻塞率,文章对交迭段保护机制、预规划多环、冲突避免算法、延时恢复算法等新型保护恢复机制进行了研究,得出观点:保护和恢复机制合理,由时分复用向分组承载的平滑演进、网络融合和网络全业务化才有可能。 相似文献
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《Broadcasting, IEEE Transactions on》2009,55(4):802-809