摘要
数字电视被称为继黑白电视和彩色电视之后的第三代电视，由于它采用数字压缩编码技术处理视频、音频信号，使得电视广播以崭新的面貌出现，不仅提高了视频、音频的质量，而且提供了业务上的灵活性和多样性。以数字电视为终端的接收平台，可以接收传统电视所不能实现的业务，比如说：可以接收电子邮件，网上购物，因特网浏览，视频点播，远程医疗，远程教育等等。数字电视的发展趋势是实现高清晰度电视。目前，我国迫切需要制定数字电视的标准，拥有自主知识产权的关键技术。这些都是促进我国数字电视产业化的重要因素。
电子节目指南(EPG)是数字电视系统的重要组成部分，电子节目指南给用户提供友好的用户界面，可以方便用户获得他所需的一些业务信息，同时电子节目指南业务提供的好坏，在很大程度上会直接影响业务提供者的经济收入。电子节目指南系统包括前端系统和接收端系统。前端系统主要包括SI服务器，负责SI数据的生成，接收端负责SI数据的解码，并在本地建立SI数据库，通过用户友好的界面与用户交互。
我国的数字电视技术还不成熟，很多技术还处于研究阶段，数字电视的标准也还在研制当中，本文就数字电视中的信息业务及电子节目指南作了一些初步的研究。阐述了DVB SI标准，及电子节目指南系统基于PC机的仿真实现。构造了SI数据存储的数据结构，建立了SI本地数据库；研究了EPG界面的显示技术，实现了EPG界面的显示，EPG界面由许多图形元素合成的，合成时遵照Porter-duff规则按照一定的步骤进行的，EPG中的状态转移是由消息响应的机制来驱动的。
Digital TV is the third generation television after the black and white television and the color television. Because of taking digital technical in Video and Audio compressing and coding;DTV take on a new look. It not only provide high definition video and high quality .. audio,but also provide muti-service .Which made the user got the satisfied audio-visual feeling and satisfied service .DTV could make full usev of the present broadcast network .telecom network and computer network. DTV can receive many kinds of services that traditional analog television could not receive,such as receiving EMAIL,shopping by INTERNET,Web browsing,VOD,Tele-medical,tele-school and so on . DTV became the platform by which you can get information,enjoy yourself and buy something in home. The developing direction of DTV is HDTV (high definition television). The industrialization of DTV will force the industry development of microelectronics manufacture,telecommunication,television system,the software and hardware of computer,mov
ie etc . So it can boost the industry of electronic,communication and others .At present,making ourselves DTV specification and owning the right of independence knowledge is of the utmost urgency to our country. Which are the important factors promoting the DTV industrialization of our country.
The electronic program guide (EPG) is the important composition of DTV system .It can provide user the friendly-user interface,which can convenient for the user acquiring the service information what they want. And the service of EPG quality can effect on the economic income of the service provider .The EPG system is composite of head-end system and tail-end system .The SI server of head-end system can generate the SI data,and the rail-end system can demux,decode SI data,create SI database at ROM .
The technical of DTV is not mature in our country,many technical is on researching,and the specification owning by ourselves is on constituting,In the article,I have a pilot study on the service information and EPG in DTV system. I expatiate the DVB SI (EN 300 468 ) specification and EPG realizing.
引文
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