The Research And Realization Of Kernel Technologies In DVB-C System

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.