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Method for descrambling digital TV set by separating set from card

A technology for separation of machine cards and TV sets, which is applied to TVs, color TVs, components of color TVs, etc., can solve the problems of inability to watch digital programs, etc., and achieve the effect of convenient manufacturing and use.

Pending Publication Date: 2007-12-26
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the actual use process, due to the non-standard code stream of the digital front end, after testing and analysis, it is found that when the PMT table and CAT table information are not sent in the PSI data of the code stream, or the information of the PMT table and CAT table is incomplete ; Separation of machine and card, even if the digital TV user terminal has a smart card and a CAM card corresponding to it, it is impossible to watch scrambled digital programs

Method used

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  • Method for descrambling digital TV set by separating set from card
  • Method for descrambling digital TV set by separating set from card

Examples

Experimental program
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Embodiment

[0020] In this embodiment, the CPU of the digital TV extracts the conditional access information data required for descrambling, that is, the program number, the conditional access system identifier, the entitlement control information identifier, and the elementary stream data.

[0021] Program number (Program number) is used to number the program;

[0022] The conditional access system identifier (CA System pid) is used to identify the type of encryption system;

[0023] The Entitlement Control Message Identifier (ECM pid) is used to decrypt the key.

[0024] The elementary stream data includes data types, video data, audio data, and so on.

[0025] In order for the extracted conditional access information data to be recognized by the CAM card interface, the digital TV CPU constructs the conditional access information data into a format that can be recognized by the CAM card, that is, adopts the syntax format of the CA PMT table.

[0026] The CA PMT table is an internal st...

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Abstract

The invention is used for descrambling either non-standard TS stream data or standard TS stream data. The method comprises: a) the CPU in digital TV set extracts the conditionally-receiving information data from the scrambled bit-stream; b) CPU in digital TV set uses the conditionally-receiving information data to construct a CA PMT table; c) the CPU in the digital TV set sends said CA PMT table to the CAM card interface; according to the conditionally-receiving information data in the CA PMT table, the CAM card and intelligent card descramble the scrambled bit-stream.

Description

technical field [0001] The invention relates to data video broadcasting technology, in particular to digital television conditional access technology. Background technique [0002] With the development of digital video broadcasting (DVB), viewers will face more and more choices of digital TV programs. However, due to the increase in investment costs, the broadcasting industry requires users to charge certain viewing fees. A conditional access system (CA system, Conditional Access System) is a system for implementing access control on certain broadcast services. Its main function is to ensure that only users who have paid or are about to pay can watch the selected TV programs. [0003] The intention of the machine-card separation digital TV technology is to make the digital TV receiving equipment irrelevant to the CA smart card, and the two are connected through the CAM card (Conditional Access Memory) interface, as shown in Figure 1a; all the The software and hardware are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16H04N5/00H04N21/435
Inventor 冯杨
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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