Digital Tv Conditional Access System And Descrambling System Development

With its obvious technical superiority, digital TV makes it possible for the consumers to access more information resource, and accelerate the transmission of our TV enterprise from welfare style to intensive, industrial style. The development of conditional access system with our own IP is the key aspect for rapid acceptance of digital TV in our country.In this dissertation, the pivotal points relating to conditional access system, including the framework of MPEG-2 system layers, the de-multiplexing of MPEG-2 system, the service information table of MPEG-2 and DVB, the encryption and decryption method for digital TV conditional access system, are fully discussed according to the market requisition. There is also a probe into the feasibility and security aspect of the coherent descramble algorithm. A real-time descramble system with DVB decipher algorithm is implemented in FPGA. The design procedure is fully illustrated and the result is provided.