文档介绍：华中科技大学
硕士学位论文
DVB-C机顶盒中软件在线升级和条件接收的设计与实现
姓名:王世勇
申请学位级别:硕士
专业:通信与信息系统
指导教师:王宏远
20060501
摘要
随着电视广播数字化的发展,数字电视产业也正在形成。这一新兴产业已经引
起广泛的关注,各个国家根据自己的国情,已分别制定出由模拟电视向数字电视过
渡的方案和产业目标。数字电视被各国视为新世纪的战略技术。在市场需求和技术
发展的促进下,功能多样的数字电视产品都将会逐步走入寻常百姓家里。
本文主要围绕着 DVB-C 接收机软件功能设计与实现进行讨论。文中首先简介
了数字电视在国内外的发展,机顶盒对于目前数字电视业务推广的重大意义和其特
点。然后阐述了整个 DVB 体系结构,重点介绍了 DVB-C 系统的原理和流程,并介
绍了 MPEG-2 标准以及数据广播和条件接收的标准。
基于对标准的理解,论文研究了 DVB-C 接收机的硬件和软件组成结构,详细
论述了 STi5518 单芯片方案的特点和其上的硬件架构设计和软件体系组织。本文重
点介绍了软件在线升级和条件接收两个功能模块在机顶盒上的设计与实现。其中,
软件在线升级包括前端数据封装、播发过程和接收机终端接收实现两个部分,涉及
到 MPEG-2 私有段的运用、机顶盒固定存储器的规划、启动流程等步骤。文章分析
了条件接收基本原理和关键技术,如智能卡和加密技术。详细介绍了在 STi5518 平
台上实现中视联条件接收系统移植的方法和过程,最后列举了在实现过程遇到的几
个实际问题和解决办法。
文中所介绍的 DVB-C 接收机已经生产出样机。该机具有良好的硬件性能,支
持多种功能需求,软件代码的可重用性高,已经正式开始了商用。
关键词: 数字电视; MPEG-2; DVB-C 接收机; 嵌入式系统;软件在线升级;
条件接收;数据广播;
I
Abstract
With the development of digital television, digital television industry is developing.
This new industry attracts large attentions. Every country, according to their own national
conditions, has aimed at the industrial objectives and developing transfer plan from
analogue television to digital television. Digital television is made as a strategic
technology of the new century in every country. Meeting the market demand and with the
advance of technics, more digital TV products with more functions will enter the ordinary
people’s homes gradually.
The design and the implementation of DVB-C Receiver software are mainly
discussed in this thesis. First the digital TV development in the world and China is briefly
introduced. Then the importance and features of Set-top-box for digital TV business
developing is discussed. The whole DVB system structure, especially the DVB-C theory
and process, is explained and studied in details. We also introduce MPEG-2、Data
Broadcast and Conditional Access standard.
Based on prehension to those standards, the architecture of hardware and
software design in the DVB-C receiver is researched. Then ch