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数字电视节目平台的数字码流信号分析 被引量:1
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作者 代明辉 《现代电视技术》 2004年第2期84-86,共3页
数字电视节目平台建成以后,对DTV信号进行指标鉴定,与传统的模拟信号检测有着本质的区别。而且,DTV的指标要比模拟信号指标严格得多,哪怕就是一点点指标错误就可能造成全网络传输失败。本文从DTV重要检测指标与检测点的应用出发,研究系... 数字电视节目平台建成以后,对DTV信号进行指标鉴定,与传统的模拟信号检测有着本质的区别。而且,DTV的指标要比模拟信号指标严格得多,哪怕就是一点点指标错误就可能造成全网络传输失败。本文从DTV重要检测指标与检测点的应用出发,研究系统平台上的传输码流分析。 展开更多
关键词 数字电视 DTV 码流分析仪 复用传输流 服务组信息
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浅谈关于泰达视频点播系统的几个技术亮点
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作者 翁向明 岳崇涛 《天津科技》 2011年第3期97-98,共2页
泰达视频点播系统设计遵循标准性和开放性原则,充分考虑系统的可靠性和安全性,业务的灵活性和扩展性。分析了系统中的几个关键技术,提出泰达视频点播系统遵循国际标准的开放的接口协议,使得交互数字电视平台具有良好的互操作性,为今后... 泰达视频点播系统设计遵循标准性和开放性原则,充分考虑系统的可靠性和安全性,业务的灵活性和扩展性。分析了系统中的几个关键技术,提出泰达视频点播系统遵循国际标准的开放的接口协议,使得交互数字电视平台具有良好的互操作性,为今后增值业务的开展提供了良好的开放式基础平台。 展开更多
关键词 信息管理系统 视频点播(VOD) 机顶盒 服务组信息
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Information resources reorganization and sharing platform of national scientific&technical document service in China
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作者 Pan Wei,Yu Hao,LiJing Min Su the National Library of Standards(NLS), network technology and program development in the IT center of library of China Agriculture University. information management in the NLS of CNIS. information services in NLS of CNIS. 《China Standardization》 2011年第1期54-57,共4页
Reorganization of network information resources for scientific and technical (scitech for abbreviation) documents and development of information infrastructure have brought a great change in China's scitech documen... Reorganization of network information resources for scientific and technical (scitech for abbreviation) documents and development of information infrastructure have brought a great change in China's scitech documentation information sharing. It integrated not only information resources, but also systems, technologies and funds. High quality services and effective resources sharing are the main goals of the platform construction. The paper describes briefly the principles and aims of the integration of the scitech information resources and networks. The services of the sharing platforms have been also introduced. 展开更多
关键词 network information resources information reorganization information services science and technologydocuments sharing platform
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IDE-OTALEX C. The First Crossborder SDI between Portugal and Spain: Background and Development
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《Journal of Earth Science and Engineering》 2013年第6期393-400,共8页
IDE-OTALEX is the first crossborder spatial data infrastructure between contiguous Portuguese (Alentejo and Centro) and Spanish (Extremadura) regions. It was implemented to share official geographic information fr... IDE-OTALEX is the first crossborder spatial data infrastructure between contiguous Portuguese (Alentejo and Centro) and Spanish (Extremadura) regions. It was implemented to share official geographic information from Alentejo and Extremadura, and now Centro region, with everyone. This is the most effective way to have a distributed and flexible system to be used as a territorial observatory for sustainable development and environment protection in these rural and low populated regions. It also contributes to territorial cohesion, one of the tree main pillars of European Cohesion Policy. It's characterized for being a distributed, decentralized, modular and collaborative system, based on standards OGC (Open Geospatial Consortium), W3C (World Wide Web Consortium), ISO (International Organization for Standardization) and open source technology, developed to guarantee interoperability between the different GIS (Geographic Information System) provided by each project partner. The geoportal is multilingual (Portuguese, Spanish and English) and integrates a Map viewer, Metadata Catalogue and Gazetteer. It consists in central and local nodes which communicate through WMS (Web Map Services), CSW (Catalogue Service Web) and WFS (Web Feature Services). It is now implementing SOS (Sensor Observation Services) and WPS (Web Map Processing). The geographic information available results of an extensive work of data harmonisation adapted to INSPIRE Directive (D 2007/2/EC, the European Parliament and Council, March 14, 2007). It integrates basic cartography, socio-economic, territorial and environmental indicators. 展开更多
关键词 Spatial data infrastructure IDE-OTALEX Alentejo-Centro-Extremadura EuroACE crossborder cooperation Spain-Portugal INDICATORS sustainability.
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