DVB (Digital Video Broadcasting) conditional sending device integrating basic data and normal data scrambling

Abstract

The invention relates to a DVB (Digital Video Broadcasting) conditional sending device integrating basic data and normal data scrambling. The sending device comprises a user authorization module, a scrambling module and a multiplexer. The user authorization module is used for generating basic data scrambling information and normal data scrambling information. The scrambling module is used for respectively carrying out scrambling on basic data and normal data according to the basic data scrambling information and the normal data scrambling information. The multiplexer is used for multiplexing the basic data and normal data subjected to scrambling, the basic data scrambling information and the normal data scrambling information so as to form a final TS (Transport Stream) and output the TS. With the adoption of the device, a sending end can send two data contents of different resolutions, two scrambling methods of different degrees of difficulty are integrated at each receiving end, and the two data contents are corresponding to the two scrambling methods respectively, so the watching requirements of different user groups at the receiving ends on digital television programmes are met.

Description

technical field [0001] The invention relates to the field of DVB conditional transmission of digital television broadcasting, in particular to a DVB conditional transmission device integrating basic data and normal data scrambling. Background technique [0002] DVB, that is, digital video broadcasting, was initiated by the "Joint Expert Group" jointly formed by the European Telecommunications Standardization Organization, the European Electronic Standardization Organization and the European Broadcasting Union. C. There are four types of terrestrial TV DVB-T and handheld terrestrial wireless TV DVB-H. The DVB standard includes channel coding, source coding, conditional access, subtitle transmission and other components. At present, the DVB standard and the improved standard compatible with DVB are widely used in various countries and regions such as Europe, Japan, Canada, and China. [0003] The conditional access system CAS in the DVB standard is a system deployed to charg...

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Problems solved by technology

[0004] However, in the existing digital TV program user group, there are high-end users who need very high-definition program content. They can afford expensive TV program fees and relatively complicated receiving terminals. Therefore, they can watch high-definition program content through three-level decryption. But there are also some low-income groups who have just transferred from the free analog TV user base. For them, the continuity of the program and the economy of the program are important. less basic data streams, and provide inexpensive charging terminals that enable them to watch, for example, standard-definition TV programs

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