【作者】 段勇；

【导师】 昂志敏；

【作者基本信息】 合肥工业大学 ， 电路与系统， 2008， 硕士

【摘要】 随着信息及其需求的爆炸性增长,信息的选择及传输速率已经成为一个重要问题,有线电视网络有其固有的高带宽特性,适合大容量的数据传输和实时性要求,使宽带数字接入成为可能。当前我国有线电视数字化进程“整体转换”的快速推进加上数字电视本身具有广阔的市场和巨大的经济效益,同时数字电视机顶盒又是模拟电视向数字电视过渡的中间产品,所以开发数字有线电视机顶盒具有一定的理论意义和应用价值。DVB-C是DVB关于有线电视的一整套标准。DVB-C技术标准体系完善,涵盖了数字电视传输、加扰、接口及交互应用等方面。它采用了MPEG-2编码标准和数字压缩技术,节省了频道资源,提高了频谱利用率,同时采用了纠错技术,传输过程中的抗干扰能力强,并且DVB-C提供了整套条件接收的方案。本论文首先讨论了基于STi5105的DVB-C系统数字电视机顶盒的设计与开发,然后对DVB-C系统中的关键技术RS纠错编码技术、用户节目指南EPG和CA条件接收系统进行了研究,并结合实际的软硬件条件给出了相应的设计方法。本文研究了RS(204,188)码编解码的实现,并结合DVB-C中RS码的结构进行了软件仿真;对ISO/IEC 13818-1和服务信息传输规范DVB-SI标准进行了深入研究,实现了较为简单的EPG功能,为用户收看电视节目和享受信息服务提供一个良好的导航机制,使用户能方便快捷地找到自己关心的节目,查看节目的详细信息;讨论了DVB的CA系统的原理和条件接收的机制的实现。条件接收系统是数字有线电视系统的一个重要组成部分,是对终端用户接收控制和开展数字有线电视增值业务的核心技术保障系统。如何有效可靠地实现这些关键技术对DVB-C系统的高效运作具有重要的意义。最后对本文进行了总结和展望。更多还原

【Abstract】 With the development of information and requirement, the selection of information and transmission rate become a very important issue. With the wide band of CATV network, it is suited for large capacity data transmission and it meets the requirement of real time. Also, it makes possible for digital wide connection. Nowadays, DTV is the point at issue in the field of high-tech research and development due to its latent market and huge economic profit and the project of the whole translation. DTV STB is an intermediate product from analog TV to DTV. In China, it is very important for developing DVB-C STB.DVB-C is a set of standards on CATV; the standards of DVB-C are maturated, including the transmission, the scrambling, the interfaces and interactive etc. of digital TV. DVB-C adopts MPEG-2 standard and digital compressive technology, so it saves the frequency resources and improves the frequency spectrum efficiently. At the same time, DVB-C adopts error correction technology and has a strong anti-interfere ability. Besides, DVB-C provides a set of approaches to CA.Firstly, this paper discusses the design and development of the DVB-C STB based on STi5105, and then specializes the key technologies of the DVB-C: error correction of RS coding, EPG, CAS, respectively. Combining with condition of the software and hardware, it gives design meanings of the key technologies correspondingly. This paper researches on the realization of the encoding and decoding of RS(204,188), and simulates it by software; Lucubrating on standards on the ISO/IEC 13818-1 & DVB-SI, it implements the simple EPG, providing a good navigation for consumers finding their caring program efficiently and enjoying TV program & information services and examining the programs’ information particularly; Then discussing the principle and realization of the CAS. CAS is a very important part of CATV. It is a core secure technology for the control of end-users and the development of value-added business of CATV. How to implement these technologies efficiently and reliably has key signification of high-efficient operations for DVB-C. At last, it discusses the overall and prospect.更多还原