CN101094385A - Method for descrambling digital TV set by separating set from card - Google Patents
Method for descrambling digital TV set by separating set from card Download PDFInfo
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- CN101094385A CN101094385A CNA2007102010667A CN200710201066A CN101094385A CN 101094385 A CN101094385 A CN 101094385A CN A2007102010667 A CNA2007102010667 A CN A2007102010667A CN 200710201066 A CN200710201066 A CN 200710201066A CN 101094385 A CN101094385 A CN 101094385A
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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
The present invention relates to the data technique for video broadcasting, particularly the digital TV conditional reception technique.
Background technology
Along with the development of digital video broadcasting (DVB), spectators can be in the face of the selection of increasing digital television program.And the broadcasting dealer requires that then the user is collected certain license fee and uses owing to the increase of cost of investment.Condition receiving system (CA system, Conditional Access System) is exactly in order to satisfy some broadcast service to be implemented system of access control.Its major function is exactly to guarantee to have only the user who has paid or be about to defrayment just can watch selected TV programme.
The intention of digital television with separate device and card technology is to allow apparatus of digital television receiving and CA smart card have nothing to do, and both link to each other by CAM card (Conditional Access Memory) interface, as shown in Figure 1a; Digital television is except the interface of CAM card, and all software and hardwares all are identical; As long as insert in the CAM card that adapts with it, just can go out the corresponding condition program receiving by descrambling, shown in Fig. 1 b with smart card; Thereby broken away from the constraint of different CA, brought convenience for manufacturing and use Digital Television.
In TS stream (transmission code stream Transport Stream), PSI data (program specific information, ProgramSpecific Information) is divided into four classes: program contingency table (pat table), program map table (pmt table), network information table (NIT table) and conditional access table (CAT table).Wherein, pmt table and CAT table is accepted closely related with condition.Scrambling TS flows through after digital television CPU handles, and digital television CPU obtains the information of pmt table, CAT table; And then give CAM card with the information of pmt table, CAT table, and realizing descrambling by CAM card and smart card, the TS behind the descrambling spreads back digital television CPU and plays, and the user could successfully watch this program.
CAM card and smart card will be realized descrambling, must obtain relevant condition receiving control information.This process has restricted the user to a large extent can normally watch off-gauge data code flow.
In the use of reality, owing to the off-gauge reason of digital front-end code stream, after tested with information that analyze to find not send pmt table, CAT table in the PSI data of code stream, or the information of pmt table, CAT table is when imperfect; Even if digital television with separate device and card machine user side has had smart card to reach the digital program that the CAM card that adapts with it also can't realize watching scrambling.
Summary of the invention
Technical problem to be solved by this invention is to provide the non-standard TS flow data of a kind of energy descrambling also can take into account the method for descrambling digital TV set by separating set from card of standard TS flow data.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be, method for descrambling digital TV set by separating set from card is characterized in that, may further comprise the steps:
A, digital television CPU extract condition and receive information data from the scrambling transmission code stream;
B, digital television CPU receive the form that information data is built into the CA pmt table with condition;
C, digital television CPU are sent to the CAM card with described CA pmt table;
D, CAM card and smart card receive information data according to the condition in the CA pmt table and finish descrambling to the scrambling transmission code stream.
Concrete, described condition receives information data and comprises program number, condition receiving system identifier, Entitlement Control Message identifier, basic flow data.
The invention has the beneficial effects as follows, truly realize breaking away from the constraint of different condition receptions, bring more facility for manufacturing and use Digital Television.
Description of drawings
Fig. 1 a is the schematic diagram of digital television with separate device and card machine;
Fig. 1 b is the schematic diagram of CAM card and smart card;
Fig. 2 is the flow chart of the embodiment of the invention.
Embodiment
Of the prior art if successfully the TS stream of scrambling is carried out descrambling, transmission standard code stream in the time of must depending on television broadcasting promptly must comprise the information of pmt table, CAT table in the PSI data of code stream.And some present TV code flows do not comprise the information of pmt table, CAT table when transmission, or the information of pmt table, CAT table is imperfect, CAM card and smart card just can not extract condition and receive information data, and can't successful descrambling, finally influence terminal use's TV program watching.In order to allow CAM card and smart card that TS is flowed successful descrambling, its condition allows CAM card and smart card can extract condition smoothly exactly and receives information data.
Embodiment
Present embodiment utilizes Digital Television CPU to extract the required condition of descrambling voluntarily and receives information data, i.e. program number, condition receiving system identifier, Entitlement Control Message identifier, basic flow data.
Program number (Program number) is used for program is numbered;
Condition receiving system identifier (CA System pid) is used for the type of mark encryption system;
Entitlement Control Message identifier (ECM pid) is used for decruption key.
Wherein basic flow data comprises data type, video data, voice data etc.
Digital Television CPU can be discerned by the CAM card for these conditions that extract receive information data, is configured to the form that the CAM card can be discerned so condition is received information data, promptly adopts the syntax format of CA pmt table.
The CA pmt table is the standard of CAM card inside, and the syntactic structure of CA pmt table is the known technology of this area, does not give unnecessary details at this.Digital Television CPU is sent to the CAM card with pmt table, CAT table in the prior art, and CAM is stuck in inside and is converted into the CA pmt table, and CAM card and smart card flow according to the data de-scrambling TS in the CA pmt table.
The concrete steps of method for descrambling digital TV set by separating set from card are as shown in Figure 2:
1, digital television CPU extracts program number, condition receiving system identifier, Entitlement Control Message identifier, basic flow data from the scrambling transmission code stream;
2, digital television CPU adopts the form of data insertion CA pmt table to be configured to the CA pmt table program number, condition receiving system identifier, Entitlement Control Message identifier, the basic flow data of step 1 extraction;
3, digital television CPU is sent to the CAM card with the CA pmt table that makes up;
4, CAM card and smart card are finished descrambling to the scrambling transmission code stream according to the data in the CA pmt table that makes up.
Claims (3)
1. method for descrambling digital TV set by separating set from card is characterized in that, may further comprise the steps:
A, digital television CPU extract condition and receive information data from the scrambling transmission code stream;
B, digital television CPU receive the form that information data is built into the CA pmt table with condition;
C, digital television CPU are sent to the CAM card with described CA pmt table;
D, CAM card and smart card receive information data according to the condition in the CA pmt table and finish descrambling to the scrambling transmission code stream.
2. method for descrambling digital TV set by separating set from card according to claim 1 is characterized in that, described condition receives information data and comprises program number, condition receiving system identifier, Entitlement Control Message identifier, basic flow data.
3. as method for descrambling digital TV set by separating set from card as described in the claim 2, it is characterized in that described basic flow data comprises data type, voice data, video data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102010667A CN101094385A (en) | 2007-07-13 | 2007-07-13 | Method for descrambling digital TV set by separating set from card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102010667A CN101094385A (en) | 2007-07-13 | 2007-07-13 | Method for descrambling digital TV set by separating set from card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101094385A true CN101094385A (en) | 2007-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007102010667A Pending CN101094385A (en) | 2007-07-13 | 2007-07-13 | Method for descrambling digital TV set by separating set from card |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695089A (en) * | 2012-05-23 | 2012-09-26 | 成都东银信息技术股份有限公司 | Device and method for TS (transport stream) switching of double-slot digital television receiver |
| CN104410889A (en) * | 2014-12-22 | 2015-03-11 | 深圳国微技术有限公司 | Data processing method and condition receiving module |
| CN104683871A (en) * | 2015-02-12 | 2015-06-03 | 福建新大陆通信科技股份有限公司 | FLASH ID-based low-security set-top box encryption control method |
| CN107343212A (en) * | 2017-07-19 | 2017-11-10 | 青岛海信电器股份有限公司 | A kind of de-scrambling method of DTV, DTV and CAM cards |
-
2007
- 2007-07-13 CN CNA2007102010667A patent/CN101094385A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695089A (en) * | 2012-05-23 | 2012-09-26 | 成都东银信息技术股份有限公司 | Device and method for TS (transport stream) switching of double-slot digital television receiver |
| CN104410889A (en) * | 2014-12-22 | 2015-03-11 | 深圳国微技术有限公司 | Data processing method and condition receiving module |
| CN104410889B (en) * | 2014-12-22 | 2019-01-11 | 深圳国微技术有限公司 | A kind of data processing method and Conditional Access Module |
| CN104683871A (en) * | 2015-02-12 | 2015-06-03 | 福建新大陆通信科技股份有限公司 | FLASH ID-based low-security set-top box encryption control method |
| CN107343212A (en) * | 2017-07-19 | 2017-11-10 | 青岛海信电器股份有限公司 | A kind of de-scrambling method of DTV, DTV and CAM cards |
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