CN103841439A - Method for achieving CA seamless reception of set top box through synchronous output of double scramblers - Google Patents
Method for achieving CA seamless reception of set top box through synchronous output of double scramblers Download PDFInfo
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- CN103841439A CN103841439A CN201410066386.6A CN201410066386A CN103841439A CN 103841439 A CN103841439 A CN 103841439A CN 201410066386 A CN201410066386 A CN 201410066386A CN 103841439 A CN103841439 A CN 103841439A
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- scrambler
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Abstract
The invention relates to a method for achieving CA seamless reception of a set top box through synchronous output of double scramblers. According to the method, the two scramblers are adopted for a scrambling multiplexing system at the front end of a digital television and connected to the same CA system to synchronously output scrambling flows in real time; a connecting port of the CA system and the two scramblers has a port copy function, control words put into one scrambler are copied in the other scrambler through port copy, and it is ensured that the two scramblers have the uniform control words, so that user authorization control information generated by the CA system is completely consistent with user authorization management information, and data in the scrambling flows are consistent. Random changeful CWs are copied to break through an existing radio and television scrambling mode, it can be avoided that a blank screen appears on a television program of a receiving end in the process of scramble switching, the problem that the other scrambler is standby and can not respond, stable signals and effective broadcast of a radio and television are ensured further, and the method is high in practicability and safety and remarkable in benefit.
Description
Technical field
The present invention relates to Digital Television scrambling and descrambling technology, especially at digitlization IP front end, scrambling stream is protected, and realize the method at receiving terminal Set Top Box seamless switching CA.
Background technology
In the last few years, the develop rapidly of computer, network service and multimedia technology, had brought new opportunity to develop to radio and television.Online in digital television broadcasting, the basic service of high quality television broadcast can not only be provided, can also carry out multiple value increasing service, as high-speed Internet access, video conference, video telephone, video request program, software download, network gaming etc., create more multivalence value and benefit by substantial business service.Therefore, under market economy, allow user oneself want that the TV programme seen and value-added service pay, just become the primary selection of operator.
Condition reception CA(Conditional Access) technology for digital television broadcasting carry out paid service required technical guarantee is provided.CA system, by the digital television program content of broadcasting is carried out to digital interference, is set up effective charging system, makes the user of charges paid can normally receive his ordered TV programme and value-added service, thereby has ensured the legitimate interests of television operator.
Condition reception has been realized the Conditional Access of classification, management and the program of program and business information, is the important guarantee of Digital Television charge operating mechanism.The essential characteristic of Digital Television charge operating mechanism is exactly to set up a kind of paid service system between program supplying unit, program broadcast unit and receiving user, thereby the business providing and service only limit to authorized user use.
Condition reception CA system is by Control Word generator, Control Word encryption equipment, business cipher key SK(Service Key) encryption equipment and SAS Subscriber Authorization System SAS(Subscriber Authorized System) etc. form, the generation of the related datas such as main completing user Entitlement Control Message (ECM) and user authorization management information (EMM), and with by the image of scrambling, voice and data signal is multiplexed into together TS and spreads and be passed to receiving terminal.
Control Word is produced by security algorithm by control word generator, produces pseudo random sequence for controlling scrambler.CW is one group of random number, for ensureing the safe and reliable of scrambling, CW should long enough and just should be changed once a few second, CW word length is generally 60bit, conventionally converts once every 5～20s, even if hacker has decoded other word like this, because CW conversion is fast, just can not be used to descrambling, even if decoded a word, often cross the term of validity.At receiving terminal, the Entitlement Control Message (ECM) that Set Top Box is brought CA by CW carries out condition reception control to program stream.When the CW receiving does not mate with ECM, Set Top Box just cannot be controlled program stream, and TV just there will be the program disruption such as blank screen.
At present, for control word generator, even manufacturer also cannot produce two two control word generators that can produce identical CW simultaneously.Because control word generator produces the random polytropy of CW, two identical control word generators produce two identical CW between also cannot be at the same time, have so just limited digital TV front-end and cannot carry out the active and standby two dual output protection mechanisms of overlapping scrambling systems.The protection mechanism of existing digital TV front-end scrambling system has two kinds:
One, utilize a primary scrambler is sent out TV signal information by CA server to carry out scrambling; and adopt an other scrambler for subsequent use (parameter configuration is identical with primary scrambler) to carry out idle protection; once primary scrambler goes wrong; cannot export time; the scrambler for subsequent use of standby will and be reached the standard grade from dynamic response; generate new control word (CW) output signal; Set Top Box is receiving the response time that new CW and ECM need to be certain; during this period of time, can produce the phenomenons such as blank screen.There is following defect in this protection mechanism:
(1) switching of scrambler has the response time, and when switching, the Set Top Box of receiving terminal there will be the phenomenons such as blank screen;
(2) scrambler for subsequent use is for a long time in holding state, and can be unable to estimate it response in time in the situation that primary scrambler breaks down.
Two, the two-way digital television signal of scrambling system only has a road to carry out scrambling setting, and an other road does not have scramble information, and in the time of scrambler failure, system will automatically switch to the not signal of scrambling of an other road, has realized not interrupting of TV signal.There is following problem in this protection mechanism:
(1) in the time of scrambler failure, system is switched to the digital television signal of not scrambling, and user can watch the program of not watching at ordinary times and obtain some undelegated authorities, badly influence like this radio and TV operator's interests.
(2) after scrambler is repaired, switch back the digital television signal of scrambling, at this moment Set Top Box need to receive ECM and CA again, there will be of short duration blank screen phenomenon when response.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of in the scrambling of digital TV front-end efficient stable and in the method for the seamless reception of receiving terminal Set Top Box CA, overcomes the defect of existing scrambling mode protection mechanism.
The present invention solves the problems of the technologies described above taked technical scheme: a kind of pair of synchronous output of scrambler realizes the method for the seamless reception of Set Top Box CA, scrambling multiplex system at digital TV front-end adopts two scramblers, be respectively primary scrambler and scrambler for subsequent use, primary scrambler and scrambler for subsequent use are accessed to same set of CA system, and two scrambler real-time synchronization outputs add flow-disturbing;
Described CA system and the connectivity port of primary scrambler and scrambler for subsequent use have port copy function, scrambler for subsequent use copies by port, the control word of sending into primary scrambler is copied into scrambler for subsequent use, ensure that primary scrambler and scrambler for subsequent use have unified control word, subscriber authorisation control information and user authorization management information that CA system is generated are in full accord, add the data consistent in flow-disturbing.
Compared with prior art, beneficial effect of the present invention is:
(1) two scrambler real-time synchronization output adds flow-disturbing, there will not be a wherein fault, and the disruption such as blank screen appear in receiving terminal TV programme when scrambling is switched, and have also overcome the phenomenon that scrambler standby for subsequent use cannot respond.
(2) random changeable CW has been realized and having been copied, broken through existing radio and television scrambling mode, further guaranteed the stable of broadcast television signal, effectively broadcasted.
(3) the present invention is practical, safe, remarkable benefit.
Brief description of the drawings
Fig. 1 is the ideograph of the first scrambling system described in background technology.
Fig. 2 is the ideograph of the second scrambling system described in background technology.
Fig. 3 is the scrambling mode figure that the synchronous output of of the present invention pair of scrambler realizes the seamless method of reseptance of Set Top Box CA.
Fig. 4 is that the synchronous output of of the present invention pair of scrambler realizes the response diagram of the seamless method of reseptance of Set Top Box CA after breaking down.
Embodiment
With example, technical scheme of the present invention is described in further detail with reference to the accompanying drawings below.
The protection mechanism of existing digital TV front-end scrambling system has following two kinds:
As shown in Figure 1, utilize a primary scrambler is sent out TV signal information by CA server to carry out scrambling, and adopt a scrambler for subsequent use (parameter configuration is identical with A) to carry out idle protection, once primary scrambler goes wrong, cannot export time, the scrambler for subsequent use of standby will and be reached the standard grade from dynamic response, generates new Control Word output signal, Set Top Box is receiving the response time that new CW and ECM need to be certain, and when switching, the Set Top Box of receiving terminal there will be the phenomenons such as blank screen; And scrambler for subsequent use is for a long time in holding state, and can be unable to estimate it response in time in the situation that of primary scrambler failure.
As shown in Figure 2, the two-way digital television signal of scrambling system only has a road to carry out scrambling setting, an other road does not have scramble information, in the time of scrambler failure, system automatically switches to the not signal of scrambling of an other road, user can watch the program of not watching at ordinary times and obtain some undelegated authorities, have a strong impact on radio and TV operator's interests; And after scrambler is repaired, be switched to the digital television signal of scrambling, Set Top Box need to receive ECM and CA again, there will be of short duration blank screen phenomenon when response.
The present invention improves for above-mentioned two kinds of existing defects of scrambling system just, as shown in Figure 3, a kind of pair of synchronous output of scrambler realizes the method for the seamless reception of Set Top Box CA, scrambling multiplex system at digital TV front-end adopts two scramblers, be respectively primary scrambler and scrambler for subsequent use, primary scrambler and scrambler for subsequent use are accessed to same set of CA system, and two scrambler real-time synchronization outputs add flow-disturbing;
Described CA system and the connectivity port of primary scrambler and scrambler for subsequent use have port copy function, scrambler for subsequent use copies by port, the control word of sending into primary scrambler is copied into scrambler for subsequent use, ensure that primary scrambler and scrambler for subsequent use have unified control word, subscriber authorisation control information and user authorization management information that CA system is generated are in full accord, have guaranteed to add the data consistent in flow-disturbing.
As shown in Figure 4, when primary scrambler breaks down, cannot export Control Word time, control word generator for subsequent use does not receive the CW copying, will produce immediately new Control Word 2, CA system can produce new EMM2 after receiving CW2, realizes the seamless switching of signal in receiving terminal Set Top Box.When primary scrambler reparation, the input of Control Word detected, control word generator for subsequent use just stops producing CW2, copies CW1, again realizes the output of two-shipper real-time synchronization and adds flow-disturbing.
The present invention can solve following technical problem:
(1) solved and in existing scrambling system, be switched to the problem that Set Top Box after scrambler for subsequent use there will be short time blank screen.
(2) realize the real-time output that adds flow-disturbing, had more superiority than existing scrambling mode.
(3) broken through active and standby two paths of signals in digital television broadcasting system and cannot produce the technical barrier of identical CW, further stable for digital television broadcasting system, effectively operation provides powerful guarantee.
Claims (1)
1. the synchronous method that realizes the seamless reception of Set Top Box CA of exporting of two scramblers, it is characterized in that, scrambling multiplex system at digital TV front-end adopts two scramblers, be respectively primary scrambler and scrambler for subsequent use, primary scrambler and scrambler for subsequent use are accessed to same set of CA system, and two scrambler real-time synchronization outputs add flow-disturbing;
Described CA system and the connectivity port of primary scrambler and scrambler for subsequent use have port copy function, scrambler for subsequent use copies by port, the control word of sending into primary scrambler is copied into scrambler for subsequent use, ensure that primary scrambler and scrambler for subsequent use have unified control word, subscriber authorisation control information and user authorization management information that CA system is generated are in full accord, add the data consistent in flow-disturbing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410066386.6A CN103841439A (en) | 2014-02-26 | 2014-02-26 | Method for achieving CA seamless reception of set top box through synchronous output of double scramblers |
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| CN201410066386.6A CN103841439A (en) | 2014-02-26 | 2014-02-26 | Method for achieving CA seamless reception of set top box through synchronous output of double scramblers |
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| CN103841439A true CN103841439A (en) | 2014-06-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363467A (en) * | 2014-10-30 | 2015-02-18 | 成都康特电子高新科技有限责任公司 | Front end digital television system |
| WO2019023862A1 (en) * | 2017-07-31 | 2019-02-07 | Oppo广东移动通信有限公司 | Data processing method and product related thereto |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852447A (en) * | 2006-03-28 | 2006-10-25 | 华为技术有限公司 | System and method for realizing backup of scrambler |
| CN102131104A (en) * | 2011-03-22 | 2011-07-20 | 中广传播集团有限公司 | Method for scrambling service |
| CN102769776A (en) * | 2012-07-30 | 2012-11-07 | 山东泰信电子股份有限公司 | System and method for enabling CAS (Conditional Access System) terminal to timely obtain entitlement |
| CN203691556U (en) * | 2014-02-26 | 2014-07-02 | 广西广播电视信息网络股份有限公司 | System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers |
-
2014
- 2014-02-26 CN CN201410066386.6A patent/CN103841439A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852447A (en) * | 2006-03-28 | 2006-10-25 | 华为技术有限公司 | System and method for realizing backup of scrambler |
| CN102131104A (en) * | 2011-03-22 | 2011-07-20 | 中广传播集团有限公司 | Method for scrambling service |
| CN102769776A (en) * | 2012-07-30 | 2012-11-07 | 山东泰信电子股份有限公司 | System and method for enabling CAS (Conditional Access System) terminal to timely obtain entitlement |
| CN203691556U (en) * | 2014-02-26 | 2014-07-02 | 广西广播电视信息网络股份有限公司 | System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363467A (en) * | 2014-10-30 | 2015-02-18 | 成都康特电子高新科技有限责任公司 | Front end digital television system |
| WO2019023862A1 (en) * | 2017-07-31 | 2019-02-07 | Oppo广东移动通信有限公司 | Data processing method and product related thereto |
| US10944681B2 (en) | 2017-07-31 | 2021-03-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Methods and devices for data processing |
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