Program previewing method and system based on digital television

Abstract

The invention provides a program previewing method and system based on a digital television, wherein the method comprises: a set top box receives and analyzes the program mapping table of a corresponding channel program according to the channel switching command of a user; whether a previewing identifier exists in the private descriptor of the program mapping table is judged; if so, an identifier transmission packet in the private descriptor is transmitted to a condition receiving system, and the condition receiving system judges whether the identifier transmission packet is authorized; and if no, the previewing procedure is carried out. The invention correspondingly provides the program previewing system based on the digital television. The embodiment of the invention has the following beneficial effects: a program previewing function can be achieved in a unidirectional broadcast system of a digital video broadcasting-cable (DVB-C), a digital video broadcasting-terrestrial (DEVB-T) and a digital video broadcasting-satellite (DVB-S), thus programs can be preferably popularized; the operation is simple, additional management systems are not required, and the program previewing function can be achieved based on the existing conditional access (CA) system; and preview programs can be scrambled by virtue of an CA front-end system, thus the safety of program content can be enhanced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for previewing programs based on digital television. Background technique [0002] With the popularization of digital TV, paid programs are constantly increasing. However, people are accustomed to watching free TV programs, lack of understanding of paid programs, and it is difficult to accept paid programs, so digital TV pay programs need to be promoted. The traditional promotion mode is to make a demonstration in the business hall or pre-authorize the CA (Conditional Access, Conditional Access) system to allow users to experience it for a period of time for free. content. [0003] The Chinese application number is 200710143004.5, and in the open invention patent application titled "Method and System for Previewing Live Channels in Internet TV", a method and system for previewing live channels in Internet TV are proposed. It is mainly that the front end uses a pre...

AI Technical Summary

Problems solved by technology

It is mainly that the front end uses a preview management system to control unauthorized users to be able to preview programs. This method requires the user end to return user information, and the front end uses user information to determine whether the user has obtained authorization by ordering the program. Obviously, the network environment of this method is a two-way network environment, which is not applicable to the current DVB-C (Digital Video Broadcasting-Cable), DVB-T (Digital Video Broadcasting-Terrestrial), DVB-S (Digital Video Broadcasting- Satellite) one-way network

Moreover, this method requires a complete set of preview management system for preview control management, which is complex and difficult to implement.

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