全球范围内,广播电视的数字化是发展的必然趋势。进入21世纪,世界各国都在紧锣密鼓地抓紧DTV(Diqital Television)数字电视广播的推进。美国全面实现DTV广播,停止传统模拟广播的计划年——2006已来临,日本计划于2011年关闭模拟电视广播频道,欧洲大部分国家计划于2008-2015年间回收模拟电视频道。我国也制定了2015年在全国范围内全面停播模拟节目的计划(世界部分国家数字电视节目开播时间表见附录3)。在各个国家的计划终结年来临之前,上述地区与国家已陆续开播DTV节目,甚至DTV高级水准的HDTV(High Difinition Television)高清晰度电视节目也开始通过地面、有线、卫星、网络等不同传输方式提供给亿万电视观众欣赏。可喜的是,我国央视与上视也从2005年下半年起试播HDTV高清电视节目,并且央视于2006年元旦正式对外播出。全球高清电视节目的试播与正式开播意味着DTV灿烂明天的HDTV之曙光如晨曦东升的旭日已照射到地球村的千家万户,人们等待的只是尽情获得美轮美奂图像画面带来的极大视觉上的舒服事受。为了让更大范围内的寻常百姓全方位地熟悉与了解HDTV,笔者撰写本文,以供广大读者参考。今日HDTV的开播来之不易,它是世界各国几代工程技术人员在近百年中携手共同探索、求证与研发的成就及结果,是经过电视几个里程碑式的飞跃发展一步一步改进、提高、更新后才走到了光辉的今天。自伦敦实验室第一台电视机公开展示至今的80年中,电视已从模糊的黑白转变成清晰的彩色;扫描线已从最初机械扫描的18- 24线变成现今电子扫描的1125线;核心部件已从真空管过渡到包括大规模集成电路在内的固态器件;音响效果已从单调的单声道转换为Hi-Fi高保真环绕声的5．1声道;信号传输方式已从单一的地面发展成地面、有线、卫星、网络等四种……电视一切的一切都起了质的变化,换来的是高质量的视音享受。HDTV高清电视广播在全球范围内虽有领先者开通实现,但目前仅是凤毛麟角寥寥无几,远未达到世界大同的普及程度。相当一部分普通消费者对DTV与HDTV从概念到技术等方面的熟悉与了解程度有限,大多数还是一知半解,认识认知尚有不少混淆不清的疑惑。本篇将拾取其中普遍存在的几个问题,试着予以解惑。 Globally, the digitization of radio and television is an inevitable trend of development. In the 21st century, all countries in the world are stepping up the promotion of DTV (Diqital Television) digital television broadcasting in full swing. The United States plans to fully implement DTV broadcasting and stop the traditional analogue broadcasting Year - 2006 has come, Japan plans to close the analogue television broadcasting channel in 2011, and most European countries plan to recover analogue TV channels in 2008-2015. China has also put in place a plan to stop broadcasting simulations nationwide in 2015 (see Appendix 3 for the schedule of launching of digital television programs in some countries of the world). Before the advent of various countries’ programs, the above regions and countries started to broadcast DTV programs one after another, and even DTV’s high definition television (HDTV) high definition television programs started to be distributed over terrestrial, cable, satellite and network transmission channels Provided to billions of television viewers enjoy. The good news is that China’s CCTV and Shanghai TV from the second half of 2005 since the pilot HDTV HDTV programs, and CCTV officially broadcast on New Year’s Day in 2006. The trial and official launch of the global high-definition television program mean the dawn of tomorrow’s HDTV of DTV. As the rising sun on the dawn of Dawn has touched millions of people in the global village, people only wait for the great visual effects brought by beautiful and magnificent images Comfortable on the subject. In order to make a wider range of ordinary people familiar with and understand all aspects of HDTV, I write this article, for the majority of readers reference. HDTV today’s hard-won, it is the achievements and results of several generations of engineering and technical personnel in various countries in the world engaged in joint exploration, verification and research and development in the past century. It has been improved through several milestone leaps and bounds in television. After coming to a glorious today. In the 80 years since London Labs first television set was publicly displayed, television has been transformed from obscure black and white to clear color; the scanning lines have been transformed from the original mechanical scanning of 18-24 lines to today’s electronic scanning of 1125 lines; Core components have transitioned from vacuum tubes to solid-state devices including large scale integrated circuits; the acoustic effects have been converted from monotone mono to 5.1 channels of Hi-Fi high-fidelity surround sound; and signal transmission has evolved from a single The ground developed into the ground, cable, satellite, Internet and other four ... ... Everything in the television have played a qualitative change, in exchange for high-quality video and audio enjoyment. Although HDTV HDTV broadcasts have been launched by leaders all over the world, only a few of them are currently far from being popular in the world. A considerable part of the average consumer DTV and HDTV from concept to technology and other aspects of the familiarity and understanding of the limited, most still know little about, there are still many confusion in understanding awareness of doubt. This article will pick up several common problems, try to be puzzled.