数字电视传输技术新进展及展望

数字电视传输技术是数字技术发展的产物,代表了一个国家科学技术发展的水平.本文介绍了数字电视传输技术以及常见的几种数字电视传输技术应用场景,指明了数字电视传输技术未来发展方向,提出了数字电视传输技术应当紧跟时代潮流发展的结论.     

基于有线电视网络的数字电视传输技术探讨

现如今,随着数字电视市场规模的扩大,数字电视传输技术的提高,高清、激光等都带动了数字电视行业的全新发展.利用卫星技术对数字电视进行全面的覆盖,这也是数字电视网络发展的一个全新的机遇.本文主要通过阐述在有线电视网络的促动下,数字电视传输技术的相关分析探讨,以此来推动我国数字电视市场的新发展.     

一种基于统计的数字电视信息过滤算法

对比了数字电视信息过滤与网络信息过滤技术,并对基于统计的数字电视信息过滤算法进行了设计,该算法能适应数字电视机顶盒CPU占用时间少、内存开销小的高要求.实验结果表明该算法具有较好的过滤效果.     

以有偿公益地面电视推动农村数字电视发展

分析认为,中国现行的数字电视发展战略实质上是城市数字有线电视优先战略.尽管国家广电部门对发展农村数字电视作出了很大努力,但当前的实际情况不尽如人意.分析了农村数字电视发展缓慢的问题实质,提出一种创新的发展思路,即推动以地面数字电视为主体的有偿公益运营模式,以加速农村的数字电视发展.     

地面数字电视规模发展还需时日

地面数字电视进入导入期 随着数字化时代的到来,中国数字电视替代模拟电视已经成为不可逆转的历史潮流.在广电领域,中国的数字电视正通过有线、卫星和地面三种途径发展着数字电视产业.而电信运营商也在通过IPTV的方式发展数字电视业务.目前,有线数字电视是中国数字电视发展的主体;直播卫星虽已成功发射,但运营模式还没有确定,目前尚无实际性进展;IPIV发展较预期缓慢,且盈利能力成为其发展的瓶颈;地面数字电视标准自2006年8月正式颁布,2007年8月正式实施,至今已有近一年的时间,取得了一定的进展.中国的地面数字电视正处于发展的导入期.     

深圳市有线数字电视广告发展研究

基于对深圳市有线数字电视运营商、广告代理公司、第三方数据服务商等高层管理人员深度访谈所得到的一手资料,对2012年深圳市有线数字电视广告的发展情况进行了较为全面的研究.首先从深圳的社会经济背景、广电发展背景和数字电视发展情况三方面呈现了有线数字电视广告的发展环境,其次对深圳数字电视广告的发展现状进行了分析,最后指出了深圳数字电视广告存在的优势和问题.     

数字电视离老百姓有多远

从国际国内数字电视的发展历程、老百姓对数字电视的认识程度,以及发展数字电视用户的措施等方面阐述了数字电视离老百姓已经越来越近了.     

浅析地面无线数字电视广播系统建设

地面无线数字电视发展迅速,特别是随着国标的出台,地面无线数字电视的发展将迎来新一轮快速发展的时代.发展地面无线数字电视,是加速推进广播电视“村村通”工程的有效方式.首先概述了地面无线数字电视,然后介绍地面无线数字电视的优势,最后从建设需求、标准选择、系统结构和组成、信号覆盖情况等多方面,阐述新余市广播电视台的地面数字电视广播系统建设情况.     

数字电视传送流丢包和丢包率研究

定义了数字电视传送流丢包,并通过实验指出丢包对电视信号有重要影响,建议把定义的丢包率作为评价数字电视信号传输质量的客观指标之一.为此,提出了两种分析丢包和统计丢包率的算法,并进行了实验验证.     

数字电视的问题研究

概要分析介绍了数字电视的发展历程,从运营模式和技术标准两个角度分析了数字电视发展过程中的问题,并且有针 对性地给出了若干发展数字电视的对策和建议,对于进一步提高数字电视发展应用水平具有一定借鉴意义.     

An HDTV‐Compatible 3DTV Broadcasting System

We introduce a high‐definition three‐dimensional television (3DTV) broadcasting system that is fully compatible with the existing transmission system of high‐definition television (HDTV). Specifically, we developed high‐definition 3DTV broadcasting subsystems including a 3DTV camera, 3DTV video multiplexer and demultiplexer, 3DTV receiver, and 3DTV outdoor broadcast van. To verify the developed subsystems, we performed experimental services of 3DTV broadcasting during the 2002 FIFA World Cup Korea/Japan.. According to our subjective evaluation test, 88% of 273 viewers rated the perceived depth of 3DTV as “Good,” and 36% of the viewers preferred 3DTV to other digital broadcasting services.     

Investigation into the interference potential of spread-spectrum clock generation to broadband digital communications

Since its inception, spread-spectrum clocks have been a valuable technology for the purposes of EMI reduction and EMC compliance. This study evaluates the interference potential of spread spectrum clocks to broadband digital communications such as high definition television (HDTV). This is accomplished by comparing the spread spectrum clock interference susceptibility of digital television (DTV) receivers to the interference susceptibility of analog television receivers. This study shows that DTV receivers are more immune to the same level of interference than existing analog television receivers by 16 dB. Since industry has shown that analog television has had negligible interference from information technology equipment, including spread spectrum clocks, then the digital systems should have even less.     

数字电视机顶盒的组成原理及设计方案研究

数字电视机顶盒是传统模拟电视时代向数字电视时代过度的必然选择,它由硬件平台、软件平台和智能卡三部分组成,主要完成数字电视信号的解调、解码和表现等功能.分析其组成原理的基础上,提出了数字电视机顶盒的一种优化设计方案.     

数字电视与高清晰度

在介绍数字电视基本概念的基础上，分析了数字电视的特点和现状及模拟电视到数字电视的过渡，最后介绍了数字电视的标准及其发展前景。     

DTV和IPTV之我见

从数字电视、网络电视的国内外发展、技术特点、行业优势、网络优势、国家政策等方面,阐述了一个广播电视从业人员对数字电视和网络电视的认识和理解,并期待数字电视和网络电视在我国有更好的发展,真正为广大用户服务。     

构建数字电视服务营销竞争优势

数字电视服务营销体系及其竞争优势的构建是当前我国数字电视产业发展面临的核心课题，本文在阐述数字电视概念、产业背景基础上，分析了在我国发展数字电视产业的优势条件，并结合竞争优势理论对其进程进行讨论，提出了构建付费电视产业链可持续发展的若干可行性建议。     

基于QAMi5516设计的DVB-C数字电视机顶盒

介绍基于STMicro公司的最新一代单片式有线数字电视机顶盒芯片QAMi5516和嵌入式实时操作系统STLite/OS20设计的DVB-C数字电视机顶盒的总体方案,阐述DVB-C数字电视机顶盒的软硬件设计方法,给出DVB-C数字电视机顶盒的性能测试结果。     

Personal Mobile DTV Cellular Phone Terminal Developed for Digital Terrestrial Broadcasting With Internet Services

Digital terrestrial broadcasting in Japan specifies a service profile not only for fixed receivers in the home, but also for personal mobile terminals such as acellular phones and PDAs. Services for personal mobile terminals are expected to become more attractive with sufficient functionality and flexibility by utilizing the network connectivity of mobile terminals. In order to verify the possibilities of digital television broadcasting (DTV) services for personal mobile terminals and clarify technical problems at the commercial level, we developed a prototype mobile terminal capable of receiving digital terrestrial broadcasting in addition to the Internet. This paper describes the assumed DTV service for personal mobile terminals and the technical architecture of the developed mobile terminal with regard to the hardware and the software. Several experiments using the developed mobile terminal were conducted and the performance was evaluated.     

ATSC Video and Audio Coding

In recent decades, digital video and audio coding technologies have helped revolutionize the ways we create, deliver, and consume audiovisual content. This is exemplified by digital television (DTV), which is emerging as a captivating new program and data broadcasting service. This paper provides an overview of the video and audio coding subsystems of the Advanced Television Systems Committee (ATSC) DTV standard. We first review the motivation for data compression in digital broadcasting. The MPEG-2 video and AC-3 audio compression algorithms are described, with emphasis on basic concepts, system features, and coding performance. Next-generation video and audio codecs currently under consideration for advanced services are also presented.     

DTV repeater emission mask analysis

Terrestrial digital television (DTV) requires careful planning in the allocation of RF channels, especially during the transition period when intermixing both analog and digital signals in the same coverage area. One important issue to consider is adjacent channel interference, which limits the number of RF channels utilized in any given area. This issue is important in the deployment of not only full service stations, but also of secondary stations such as translators, on-channel repeaters, and low power television stations. Full service stations have FCC rules that limit the amount of adjacent channel splatter by requiring the splatter energy to remain below a rigid emission mask. Currently there are no FCC rules for translators and low power television stations. The paper discusses typical DTV transmitter splatter sidebands and their causes, as well as specific methods for interference analysis from adjacent channel DTV splatter into adjacent NTSC or DTV signals. Two rigid emission masks ("simple" and "stringent") are proposed and evaluated. Several filter designs are computer simulated and analyzed for minimizing adjacent channel splatter interference as well as in-band DTV signal degradation. Linear pre-correction techniques are analyzed for various length (15-tap and 31-tap) transversal filter equalizers. The simulation is verified by measuring and evaluating DTV system performance for two hardware band-pass filters individually placed at the output of a low power (30 W average) transmitter.