【作者】 吴好；

【导师】 叶宇煌；

【作者基本信息】 福州大学 ， 通信与信息系统， 2006， 硕士

【摘要】 随着数字化、网络化、全球一体化信息时代的来临，多媒体技术成为信息技术的重要组成部分。以多媒体为广播对象的数据广播已成为数字广播的发展方向。数据广播是一种能将文本、图形、视频、音频、数据等传输到机顶盒等智能设备的一项技术。通过数据广播，用户可以从大量的信息中选择自己需要的信息。数据广播实际上是广播电视增值业务的基础。其派生出来的实际应用很多，如电视附加信息查看(EPG)、基于WEB-HTML浏览器的公共信息(TV-WEB)、无回传的股票信息发送、大量回传的视频会议、交互游戏、数据交换以及视频点播、下载等。这些丰富的多媒体信息送到用户家中，通过镜像存储，由用户按照需求取用。这种数据传播方式不仅信源丰富，传播广泛，而且还避免了信道拥堵，不能保存等短处，继广播电视和互联网之后称为第五媒体。 本文首先介绍了课题背景、数据广播的现状以及发展趋势。然后介绍了DVB的基础理论、数据广播的传输标准，并重点讲述了对象轮播(OC)协议。本文详细分析了DVB数据广播接收系统的结构，并成功开发出基于HTML的DVB数据广播嵌入式浏览器，最后对系统进行了性能指标测试。 本文设计的基于DVB的OC数据广播接收系统具有以下几个特点： 1、本系统采用了对象轮播(OC)的数据广播方式。采用OC方式，不仅信源丰富，传播广泛，而且能实现高速下载并保存。 2、终端系统采用了“实时下载、即时显示”的接收方式，保证能够快速的接收数据，以及接收到的数据随时更新。 3、嵌入式浏览器环境支持HTML4.01、JAVAScript1.5、SSL3.0、HTTP1.1、CSS1.0等，并可扩展支持多种插件(Macromedia Flash，Real Player)。 4、由于嵌入式系统内存小，本系统专门针对嵌入式系统设计，节省内存空间，对存储器要求低，采用预先缓存机制，存贮OC数据。 5、划模块设计的思路使本系统更具有先进性，可扩展性，可移植性和开放性。更多还原

【Abstract】 Mutimedia technologies have become essential part of Information Technology (IT) in such a digital, networked and uniform information world.Multimedia takes the role as the object and development trend of digital broadcasting. Data broadcasting is a technique that can transmit text, graphics, video, audio, data to an intelligent equipment, such as STB. Through data broadcasting, users can choose from a lot of information what they need. Added business of radio television is based on Data broadcast. Data broadcast has many real Applications,such as EPG、 TV-WEB、 Sending of Stock information that has no pass-back channel、 Video conference that has a pass-back channel、 interactive game、 interchange data、 VOD and download. These abundant multimedia information is sent to user’s home, stored through the mirror image , is taken according to the demand of users. This kind of data transmission is not only abundant in the source , extensive to spread, but also prevent the crowd with channels and keeping weakness.It is Called the fifth media following broadcast and television and Internet.Above all,the relevant background,current issues of digital broadcasting and future development trend are introduced in this paper. Second, Basic theories of DVB 、 data broadcasting standards are present and explained.Object Carousel(OC)is ,focused on in this section. Third, the structure of DVB data broadcast receiving system are discussed in detail and we succeed in developing an embedded browser based on HTML.Finally, the DVB system is developed successfully and the test and evaluation of capability guidelines are provided.This OC data broadcast receiving system system based on DVB has many advantages:1. This system adopts Object Carousel(OC) as the mode of data broadcasting, which makes data richness and is favor of DVB-J application of DVB-MHP.2. This system adopts mill wheel as the model of data accepting,which accepts data quickly and updates data when needed.更多还原