数字电视在HFC网络上传输的研究
|
摘要
广播电视数字化是必然的发展趋势。现阶段,我国广播电视数字化工作已进入全面推广阶段。为与之相适应,各大中城市有线电视HFC网络作为传输广播电视的主要载体,必须按照广播电视数字化的要求进行网络改造。然而,由于多方面的原因,有线广播电视的数字化工作不可能一蹴而就,模拟电视向数字电视转换不可能一下完成,因而数字电视和模拟电视不可避免地还将在一个较长时期内在HFC网络上混合传输。
本课题的主要任务,就是在现阶段数字电视与模拟电视混合传输条件下,对数字电视在HFC网络上传输进行研究,分析影响传输质量的各种因素,提出解决办法,为以后从事有线广播电视网络工程设计、工程施工提供理论指导。
本课题通过理论分析,明确了影响数字电视传输质量的主要因素有系统噪声、传输损耗、非线性失真、信号反射、数模混合传输等,指出了保证数字电视传输质量要从工程设计和工程施工两方面着手来解决问题,并就解决问题的方法给出了理论指导,最后通过工程实例证实了,通过优化设计、规范施工,能够克服上述不利因素的影响,保证有线数字电视和模拟电视节目高质量地混合传输,最终获得令人满意的电视节目收视质量。
The digitalization of broadcasting & television is an inevitable development tendency, and it has entered a stage of comprehensive promoted stage in China. In order to meet the needs, the CATV HFC networks, as the major carrier of broadcasting & television transmission in large and medium-sized cities, must be improved. However, for various reasons, the digitalization cannot be done overnight, and it is impossible to complete conversion analog television to digital television in a split second. Consequently, digital television and analog television will mixed transfer on HFC network in a long period inevitably.
In conditions with the mixed transmission of digital television and analog television at this stage, the main purpose of this article is to research the digital television transmission on the CATV HFC network, analysis the factors which affect the quality of transmission, put forward the pertinent solutions, provide theoretic guidance for engineering design and construction.
This article uses the study method of theoretical analysis, researching into the main factors, which affect the quality of digital television transmission, are system noise, transmission loss, nonlinear distortion, signal reflection, and transmission of digital television mixed with analog television, points out that we must solve problems from engineering design and construction to ensure the quality of the digital television transmission, provides the theoretic guidance that has proved by the project case. Through optimizing design、standardized construction, it will overcome these adverse factors, and ensure digital television and analog television mixed transmission with high-quality, finally gain satisfactory television program rating quality.
本课题的主要任务,就是在现阶段数字电视与模拟电视混合传输条件下,对数字电视在HFC网络上传输进行研究,分析影响传输质量的各种因素,提出解决办法,为以后从事有线广播电视网络工程设计、工程施工提供理论指导。
本课题通过理论分析,明确了影响数字电视传输质量的主要因素有系统噪声、传输损耗、非线性失真、信号反射、数模混合传输等,指出了保证数字电视传输质量要从工程设计和工程施工两方面着手来解决问题,并就解决问题的方法给出了理论指导,最后通过工程实例证实了,通过优化设计、规范施工,能够克服上述不利因素的影响,保证有线数字电视和模拟电视节目高质量地混合传输,最终获得令人满意的电视节目收视质量。
The digitalization of broadcasting & television is an inevitable development tendency, and it has entered a stage of comprehensive promoted stage in China. In order to meet the needs, the CATV HFC networks, as the major carrier of broadcasting & television transmission in large and medium-sized cities, must be improved. However, for various reasons, the digitalization cannot be done overnight, and it is impossible to complete conversion analog television to digital television in a split second. Consequently, digital television and analog television will mixed transfer on HFC network in a long period inevitably.
In conditions with the mixed transmission of digital television and analog television at this stage, the main purpose of this article is to research the digital television transmission on the CATV HFC network, analysis the factors which affect the quality of transmission, put forward the pertinent solutions, provide theoretic guidance for engineering design and construction.
This article uses the study method of theoretical analysis, researching into the main factors, which affect the quality of digital television transmission, are system noise, transmission loss, nonlinear distortion, signal reflection, and transmission of digital television mixed with analog television, points out that we must solve problems from engineering design and construction to ensure the quality of the digital television transmission, provides the theoretic guidance that has proved by the project case. Through optimizing design、standardized construction, it will overcome these adverse factors, and ensure digital television and analog television mixed transmission with high-quality, finally gain satisfactory television program rating quality.
引文
[1]常健.有线数字电视走过2006.世界宽带网络.2007,14(1):17-19
[2]鲁业频编.数字电视基础.北京:电子工业出版社,2002,11-12
[3]中国国家标准化管理委员会.中华人民共和国国家标准批准发布公告.2006,8,5
[4]国家广播电影电视总局.全国有线电视数字化进展的情况通报.北京:中国广播电视出版社,2007,1
[5]国家广播电影电视总局.GY/T170—2001.有线数字电视广播信道编码与调制规范.北京:中国广播电视出版社,2002
[6]霍云.64QAM调制与模数整体平移.有线电视技术.2005,12(9):74-79
[7]施国强等编.有线电视网络技术手册.北京:电子工业出版社,2002,117-119
[8]国家广播电影电视总局.GY5075—2005.城市有线广播电视网络设计规范.北京:中国广播电视出版社,2005
[9]雷肇棣编.光纤通信基础.成都:电子科技大学出版社,1997,39
[10]张勇,刘振兴等编.广播电视设计安装技术分册.北京:民族出版社,2002,248
[11]温怀疆,曾云相.浅谈有线电视系统中常用的光无源器件.有线电视技术.2005,12(12):53
[12]喻彤,糜东林.从模拟到数字——你现有的HFC网络需要改造吗.2004国际有线电视技术研讨会论文集.北京:中国广播电视出版社,2004,35
[13]袁伟波.高度可靠稳定的模块是HFC网络数字化强有力的保证.2005国际有线电视技术研讨会论文集.北京:中国广播电视出版社,2005,43
[14]刘洪亮.有线电视光传输中反射的产生及影响.有线电视技术.2005,12(8):82-83
[15]国家广播电影电视总局.有线数字电视频道配置指导性意见.北京:中国广播电视出版社,2003,3-4
[16]中华人民共和国信息产业部.YD/T5138—2005.本地通信线路工程验收规范.北京:北京邮电大学出版社,2006
[17]国家广播电影电视总局.GY5063—1998.市、县级有线广播电视网设计规范.北京:中国广播电视出版社,1998
[2]鲁业频编.数字电视基础.北京:电子工业出版社,2002,11-12
[3]中国国家标准化管理委员会.中华人民共和国国家标准批准发布公告.2006,8,5
[4]国家广播电影电视总局.全国有线电视数字化进展的情况通报.北京:中国广播电视出版社,2007,1
[5]国家广播电影电视总局.GY/T170—2001.有线数字电视广播信道编码与调制规范.北京:中国广播电视出版社,2002
[6]霍云.64QAM调制与模数整体平移.有线电视技术.2005,12(9):74-79
[7]施国强等编.有线电视网络技术手册.北京:电子工业出版社,2002,117-119
[8]国家广播电影电视总局.GY5075—2005.城市有线广播电视网络设计规范.北京:中国广播电视出版社,2005
[9]雷肇棣编.光纤通信基础.成都:电子科技大学出版社,1997,39
[10]张勇,刘振兴等编.广播电视设计安装技术分册.北京:民族出版社,2002,248
[11]温怀疆,曾云相.浅谈有线电视系统中常用的光无源器件.有线电视技术.2005,12(12):53
[12]喻彤,糜东林.从模拟到数字——你现有的HFC网络需要改造吗.2004国际有线电视技术研讨会论文集.北京:中国广播电视出版社,2004,35
[13]袁伟波.高度可靠稳定的模块是HFC网络数字化强有力的保证.2005国际有线电视技术研讨会论文集.北京:中国广播电视出版社,2005,43
[14]刘洪亮.有线电视光传输中反射的产生及影响.有线电视技术.2005,12(8):82-83
[15]国家广播电影电视总局.有线数字电视频道配置指导性意见.北京:中国广播电视出版社,2003,3-4
[16]中华人民共和国信息产业部.YD/T5138—2005.本地通信线路工程验收规范.北京:北京邮电大学出版社,2006
[17]国家广播电影电视总局.GY5063—1998.市、县级有线广播电视网设计规范.北京:中国广播电视出版社,1998