CN203691556U - System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers - Google Patents
System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers Download PDFInfo
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- CN203691556U CN203691556U CN201420083394.7U CN201420083394U CN203691556U CN 203691556 U CN203691556 U CN 203691556U CN 201420083394 U CN201420083394 U CN 201420083394U CN 203691556 U CN203691556 U CN 203691556U
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Abstract
The utility model relates to a system realizing CA (Conditional Access) seamless receiving of a set top box by utilizing synchronous output of double scramblers. A main scrambler and an auxiliary scrambler are connected with a CA system, so that real-time synchronous output of scrambling flows is realized. A main control word generator generates control words and sends the control words into the main scrambler. Connection ports of the CA system connected with the main scrambler and the auxiliary scrambler has a port duplication function. The control words sent into the main scrambler are duplicated and sent into the auxiliary scrambler, so that a fact that the main scrambler and the auxiliary scrambler have the same control words is guaranteed. An auxiliary control word generator generates control words and sends the control words into the CA system. According to the utility model, random and changeable control words (CW) are duplicated, so that a prior radio and television scrambling mode is improved substantially. Conditions of blank screen and the like in a television program receiving process after scrambling switchover are avoided. A problem that the standby scrambler cannot respond is solved. Stable and effective broadcasting of radio and television signals is guaranteed further. The system is high in practicability, high in safety performance and remarkable in benefit.
Description
Technical field
The utility model relates to Digital Television scrambling and descrambling technology, specifically a kind of pair of synchronous system that realizes the seamless reception of Set Top Box CA of exporting of scrambler.
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.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of in the scrambling of digital TV front-end efficient stable and in the system of the seamless reception of receiving terminal Set Top Box CA, overcomes the defect of existing scrambling mode protection mechanism.
The utility model solves the problems of the technologies described above taked technical scheme: a kind of pair of synchronous output of scrambler realizes the system of the seamless reception of Set Top Box CA, comprise CA system, primary scrambler, scrambler for subsequent use, primary control word generator and control word generator for subsequent use
Described primary scrambler is connected with CA system with scrambler for subsequent use, and real-time synchronization output adds flow-disturbing;
Described primary control word generator is sent in primary scrambler for generation of control word;
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;
Described control word generator for subsequent use is sent in CA system for generation of control word.
Compared with prior art, the beneficial effects of the utility model are:
(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 utility model 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 described in the utility model pair of scrambler realizes the seamless receiving system of Set Top Box CA.
Fig. 4 is that the synchronous output of described in the utility model pair of scrambler realizes the response diagram of the seamless receiving system of Set Top Box CA after breaking down.
Embodiment
With example, the technical solution of the utility model 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 utility model 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 system of 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 utility model 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 output of two scramblers realizes a system for the seamless reception of Set Top Box CA, comprises CA system, primary scrambler, scrambler for subsequent use, primary control word generator and control word generator for subsequent use, it is characterized in that,
Described primary scrambler is connected with CA system with scrambler for subsequent use, and real-time synchronization output adds flow-disturbing;
Described primary control word generator is sent in primary scrambler for generation of control word;
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;
Described control word generator for subsequent use is sent in CA system for generation of control word.
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| CN201420083394.7U CN203691556U (en) | 2014-02-26 | 2014-02-26 | System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers |
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| CN201420083394.7U CN203691556U (en) | 2014-02-26 | 2014-02-26 | System realizing CA seamless receiving of set top box by utilizing synchronous output of double scramblers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841439A (en) * | 2014-02-26 | 2014-06-04 | 广西广播电视信息网络股份有限公司 | Method for achieving CA seamless reception of set top box through synchronous output of double scramblers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841439A (en) * | 2014-02-26 | 2014-06-04 | 广西广播电视信息网络股份有限公司 | Method for achieving CA seamless reception of set top box through synchronous output of double scramblers |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 |