共查询到19条相似文献,搜索用时 78 毫秒
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《电视技术》2006,(10)
行业纵横AVS进展迅速有望被纳入国际IPTV标准日前,AVS工作组收到国际电联网络电视特别工作组(ITU-T)的正式文件,同意其成为a.4和a.5(政府和企业)两方面的合作组织。这意味着AVS标准已成为FG-IPTV标准的候选标准,有望与H.264、微软VC1两个标准一起构成国际IPTV标准。AVS工作组专门成立FG-IPTV特别工作小组来参与组织ITU-T的IPTV标准制定。9月13日AVS工作组收到ITU-T确认函,这表明AVS迈过了成为国际IPTV标准的路途中最大的一个门槛。IPTV产业化进程已取得阶段性成果,AVS首次在商用IPTV系统、也是业界规模最大和… 相似文献
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本文介绍了ITU-T FG IPTV前三次会议的标准制定现状,着重介绍了六个工作组在前三次会议上所取得的成果;并且对FG IPTV的标准发展趋势进行了分析,提出了自己的看法供参考. 相似文献
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徐贵宝 《电信工程技术与标准化》2006,19(3):6-9
IPTV在全球范围内越来越热,IPTV相关标准的制定工作也逐渐开展起来.本文首先介绍了相关的两大行业--电信和广电行业中国际、国内IPTV标准的制定情况,然后对IPTV标准制定工作中存在的问题进行了分析. 相似文献
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分析比较了GB/T 20090.2(AVS视频)与GB/T 17951.2(MPEG-2视频)以及2003年发布的国际标准ISO/IEC14496-10(MPEG-4 AVC/ ITU-T H.264)的技术特点及其技术差异,分析了AVS视频和AVC的复杂度差异,继之介绍了MPEG组织内部对MPEG-2视频和AVC的对比测试情况,随后是相关测试机构对AVS的主观测试结果.最后结合国际电信联盟ITU-T将AVS纳入IPTV标准的过程介绍和我国数字电视接收机将AVS作为唯一必备视频标准的决策,提出了关于数字家庭系统中视频编码标准的选择建议. 相似文献
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This article presents an architecture to support IPTV services in an IMS-based NGN. The architecture extends the current IMS specification with the required functionality to meet additional requirements of IPTV services. The proposed architecture can be deployed by an IPTV provider over heterogeneous access networks (mobile, wireless, and fixed) as a part of standardized NGN solutions. After presenting an overview of the IPTV standardization activities in DVB, ITU-T, ETSI, ATIS, 3GPP, and OMA, this article focuses on the ETSI TISPAN IPTV standardization. IMS-based IPTV architectural functions and possible IPTV evolutionary steps are discussed, and then the article presents an implementation example. 相似文献
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宋勇 《电信工程技术与标准化》2013,(5):15-19
GPON在同样的带宽下速率更高,它也在接入网中应用得越来越多,但是随着不断增长的高带宽应用,比如IPTV、VOD、HDTV等等,它们对GPON网络的容量要求越来越大。在本文中,我们提出了一种基于MAC协议的方法和一种特殊的过滤器,从而使GPON网络的资源得到更高的利用。 相似文献
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The ITU-T and ISO/IEC standard for scalable video coding was recently finalized. SVC allows for scalability of the video bitstream in the temporal, spatial, or fidelity domain, or any combination of those. Video scalability may be used for different purposes, such as saving bandwidth when the same media content is required to be sent simultaneously on a broadcast medium at different resolutions to support heterogeneous devices, when unequal error protection shall be used for coverage extension in wireless broadcasting, as well as for rate shaping in IPTV environments. Furthermore, it may also be useful in layered multicast transmission over the Internet or peer-to-peer networks, or in any transmission scenario where prioritized transmission for network flows is meaningful. In order to make usage of SVC in the aforementioned use cases, standards for defining the transport format and procedure are required. Therefore, we give a detailed overview of the recently finished SVC standards on transport over IP/RTP and the MPEG-2 transport stream. Both standards are important for IPTV and video on demand, where the first is important for SVC transport over mobile broadcast/multicast channels, and the latter is also important for SVC transport over traditional digital broadcast channels. 相似文献
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Introduction to IEEE 802.3av 10Gbit/s Ethernet Passive Optical Networks (10G EPON) 总被引:1,自引:0,他引:1
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Steve Gorshe Jeff Mandin 《中国通信》2009,6(4):136-147
In the competitive broadband access environment, providing access to "triple play" services (voice, video, and high-speed data) is an important way for both telephone and CATV network providers to increase their revenue. Passive Optical Networks (PONs) are a cost-effective, flexible, and future-proof medium for providing triple play services. The 1 Gbit/s IEEE 802.3ah Ethernet PON (EPON) and ITU-T G.984 2.5 Gbit/ s PON (GPON) are currently being deployed for triple play service access. However, high definition switched digital video service such as IPTV will require more bandwidth. This paper provides a tutorial overview of the IEEE 802.3av 10Gbit/s Ethernet PON (10G EPON) standard, including the ways in which it differs from EPON. 相似文献
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H.264/MPEG4-AVC is the latest video coding standard of the ITU-T video coding experts group (VCEG) and the ISO/IEC moving picture experts group (MPEG). H.264/MPEG4-AVC has recently become the most widely accepted video coding standard since the deployment of MPEG2 at the dawn of digital television, and it may soon overtake MPEG2 in common use. It covers all common video applications ranging from mobile services and videoconferencing to IPTV, HDTV, and HD video storage. This article discusses the technology behind the new H.264/MPEG4-AVC standard, focusing on the main distinct features of its core coding technology and its first set of extensions, known as the fidelity range extensions (FRExt). In addition, this article also discusses the current status of adoption and deployment of the new standard in various application areas. 相似文献
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基于IMS网络的IPTV分析与研究 总被引:1,自引:0,他引:1
本文介绍了IMS网络的体系结构以及IPTV的发展。分析非IMS架构的传统IPTV的架构方式,传统的IPTV有其固有的局限性,引出基于IMS系统的IPTV架构并进行阐述。对IPTV的业务管理和控制管理等关键技术做了较为详细的说明。通过实验网,实现了基于IMS的IPTV。并通过实验数据详细描述了IPTV的通信流程以及流媒体控制中的SDP所携带流媒体信息,用具体数据分析IPTV在IMS网络中的通信流程和流媒体传播。 相似文献
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