CN100442838C - Cable TV control technology added with de-interference - Google Patents
Cable TV control technology added with de-interference Download PDFInfo
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- CN100442838C CN100442838C CNB011087102A CN01108710A CN100442838C CN 100442838 C CN100442838 C CN 100442838C CN B011087102 A CNB011087102 A CN B011087102A CN 01108710 A CN01108710 A CN 01108710A CN 100442838 C CN100442838 C CN 100442838C
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Abstract
The present invention discloses a control technology of scrambling and descrambling a cable TV, which is composed of a front end scrambling device and a rear end descrambling control device. A line field of a video signal of each channel is corrected and synchronized by a synchronous scrambling / frame adding machine, and then the video signal is synchronously scrambled by a data encrypting processor; thus, a video TV signal is divided into two paths; one path of signals is sent into an adjacent frequency modulator through attenuation, compression and phase inversion and mixed into a cable TV signal sent to a cable TV network, and then the cable TV signal is sent to the descrambling controller of each user; the other path of signals is controlled by a single chip microcomputer to demodulate and separate a line field composite signal, and by taking the line field composite signal as reference, the other path of signals is sent to the adjacent frequency modulator; through a front end mixer, the other path of signals is sent to the descrambling controller of each user; addressing control is authorized to the other path of signals by a front end computer, and thus, the other path of signals provides descrambling restoration to restore an attenuated and compressed synchronous head. The present invention has the advantages of low cost, easy acceptance, automatic descrambling for watch, reliable descrambling and high safety; only one coaxial line is arranged indoors, and thus, the present invention is convenient to repair.
Description
Affiliated technical field:
The present invention relates to the CATV transmission system, TV interference blanking system, Single Chip Microcomputer (SCM) system, computer system, modern data transmission systems, the integrated application of high frequency microelectronics system, particularly a kind of cable TV scrambling and descrambling control system.
Background technology:
The cable TV conditional access system mainly contains following two kinds in recent years:
1, not scrambling of front end is terminal turn-offs or scrambling addressable charge system
This system adopts addressable branch, distributor cable TV signal to be opened, turn-offed or terminal scrambling control.This kind scheme mainly is made up of charge control centre and addressable branch distributor two parts, and charge control centre mainly finishes input and the management to user profile and paying information, after these information via encryptions, forms addressing information.Comprise secret key in the addressing information, addressable branch distributor address code and User Status sign indicating number, wherein conditional code is switch (or scrambling) state information of cable TV signal.Data modulator generally all is to adopt FSK frequency modulation modulation point to take place frequently to send mode, frequency generally is selected in 108～IIMHZ and allows this scope (this also is the transmission frequency range of stipulating in Radio, Film and Television Administration's related standards), add in the cable TV signal by blender, enter the addressable branch distributor through cable television network.The addressable branch distributor is handled the address signal of having modulated, thereby controls the opening, turn-off of each user side signal (or scrambling).This type systematic biggest advantage is that cost is low, only needing increases Subscriber Management System at Headend, increase the addressing allocation matrix at user side, because it is subscriber-coded that this type systematic just increases in cable TV signal, cable TV signal is not handled, so can not cause the distortion of signal, circuit is also simpler.But also have very big defective and deficiency since to TV signal without any treatment measures, the user can walk around addressing finger assignments controller and directly steal TV signal, promptly draws disorderly in middle private to connect, and connects signal steathily, has so just had no fail safe and reliability.This columns send, does not illegally surreptitiously look the decoding that the person often is not devoted to interference method, but be conceived to destroy addressing information according to adopting point to take place frequently as the modulation two.For example, the take place frequently addressing information penetrated of point is fallen into this point and filtering by trapper or filter frequently, this just control trapper all users afterwards at all.Make that this system is out of control, thereby reach the purpose of surreptitiously looking TV programme.Because the most important performance index of cable television charging system are exactly safe and reliable, so although this type systematic cost is very low, still be difficult to enter reliable practicality.
2, cable TV scrambling and descrambling Fare Collection System.
This system adopts the system interference that single channel is added certain particular type.This type systematic is to send into modulator after TV signal that front end will need scrambling is by the scrambling of scrambling machine, and does not need the TV signal of scrambling directly to send into modulator, and the TV signal of modulator output enters cable television network after blender mixes.Before signal enters terminal use's television set, be scrambled signals, the user has only the descrambler (set-top box) by special use could remove interference, normally watches.User side descrambler (set-top box) must possess one in each user family, he is become with the descrambling circuit bank by tuner.Tuner solves the user and wants the channel signals watched, descrambling circuit to judge whether scrambling of current channel, the descrambling of whether having the right from cable TV signal, thereby realizes with good conditionsily to sending into television set behind the scrambled channel descrambling again, and the user could normally watch.This type systematic biggest advantage is that private is drawn and disorderly connect and the person that steals the signal in the middle of can stopping, and can select which channel to need scrambling flexibly, which not scrambling of channel.Existing network can not changed.This type systematic shortcoming is also more outstanding, thereby has limited the scope of application, whole-coloredly during descrambling must carry out the addressing descrambling by set-top box or descrambling machine at every household.A descrambling machine of each user price is more expensive, and the user is difficult to accept, and while set-top box user in user family has ample time and is decrypted, descrambling.Particularly 100 yuan set-top box belongs to the scrambling type of Low Security Level, and the people of some electronic system knowledge can finish the descrambling work of decoding easily, thereby reaches the purpose that non-payment license fee is seen TV in vain.Even do not break close, in case set-top box has also been damaged, the user also can pitch up the set-top box poor quality, require to change or maintenance, will not saying so, I artificially damage, this will increase the maintenance capacity of CATV set-top-box equipment, and the person is unfavorable greatly for each cable TV station certainly, has endless trouble.So dare not use easily.
Summary of the invention:
Purpose of the present invention is exactly in order to solve the deficiency of above-mentioned existing system, provide a kind of and can be effectively the user be implemented the cable TV scrambling and descrambling control system of controlling and managing, promptly the front end in cable TV station carries out scrambling, attempt is at main line, connecing signal on the service main steathily can not realize, address data information address data information is bundled in the TV signal channel, go downwards to the user with TV signal, forming non-mode frequently in cable television network transmits, remove set-top box simultaneously, entering and have only a cable in the user family, only is descrambling TV signal or scrambled television signal in cable.The user can't crack at all.The addressing descrambling just places the administrator of cable TV station hand fully, the phenomenon that also causes maintenance capacity to increase with regard to there not being artificial damage.Cost for each household also just greatly reduces thereupon.This patent has thoroughly overcome the deficiency of various patents in the past, really solved to connect signal problem, private steathily and draw and disorderly connect and reliable, the safety of addressing and effectively, thereby the condition of finishing cable TV receives, and is beneficial to the toll administration of cable TV.
The object of the present invention is achieved like this:
Principle of the present invention is, the scrambling mode that employing is compressed paraphase with synchronous head realizes the purpose of scrambling, by the standard of TV signal and structure is formed and the reception principle of television set as can be known, television set will correctly receive the recovery image will row, field synchronization, if synchronous head is suppressed the compression paraphase, television set just can't obtain synchronizing signal so, and serious distortion will appear in image, so that can't normally watch.
The present invention is made up of the scrambling apparatus of front end and the descrambling controller two large divisions of rear end, the scrambling apparatus of front end is made up of scrambling/Frame Synchro, data encryption processor, single-chip microcomputer and adjacent channel modulator, it is characterized in that: the descrambling controller of rear end is positioned at the outdoor of controlled user and constitutes the aggregate device that the user watched radiofrequency signal in control 2-24 road is carried out group's decoding, and be subjected to the front-end computer mandate addressing control in the scrambling apparatus of front end to provide descrambling to restore, recover to be attenuated the synchronous head of compression.
After the vision signal of each channel is carried out a row correction synchronously of signal through the frame synchronization time-base circuit in scrambling/Frame Synchro, be corrected into unified synchronous and in-phase signal, carrying out synchronous scrambling through the data encryption processor handles, video tv signal is divided into two-way: one road signal is through decay, after the compression paraphase, being sent into adjacent channel modulator by the vision signal of scrambling mixes, be mixed into one road cable TV signal through the front end blender and send in the cable television network, arrive each user's descrambling controller again; The demodulation under the control of single-chip microcomputer of another road separates a trip composite signal and directly sends into adjacent channel modulator as benchmark, deliver to user's descrambling controller again through the front end blender, be subjected to front-end computer mandate addressing control to provide descrambling to restore, recover to be attenuated the synchronous head of compression.
The effect of descrambling of the present invention is a Conditional Access, realizes the toll administration of system.
The operation principle of time base correction/Frame Synchro of the present invention is: in the scrambled television system, its signal source is diversified, as video tape recorder, video disc player, gamma camera, satellite receiver, aerial TV signal, microwave signal, mobile television unit signal etc., their time reference or clock frequency are returned variant, this small difference will be brought very big difficulty to the reduction of the descrambling after the scrambling, this will the time proofread and correct on the base, the synchronous head that toilet has is all at same position.The present invention will scrambling the encoded device of television video frequency signal carry out the A/D conversion, analog signal is carried out digitized processing, and one by one deposit jumbo digital storage device in, the data of each sampling of vision signal are written into the presumptive address of memory, writing address signal is to be formed by the synchronizing signal control of separating in the vision signal of importing, the every frame video signal of data that can store a frame video signal to its digital storage device of frame synchronization repeats to store by same address, when every new frame video signal arrives, just replace the information of original addressed memory storage.So writing data just means with the data before the new data replacement.When outputting video signal, the data of memory are read one by one by reading sequence of addresses, and recover original analog signal through decoder D/A conversion.And read address signal is that to be subjected to singlechip CPU and local reference synchronizing signal be sequential control shaping, to form the vision signal of standard, so just reached synchronous head at the same position homophase, synchronously, export by driver again.
The operation principle of data encryption processor of the present invention is to comprise that input coupling, nationality position current potential, separated in synchronization, singlechip CPU, random digit are encrypted generator, scrambling forms circuit, output.Video standard signal by time base correction/frame synchronization output is divided into two-way through input matching circuit, one the tunnel sends into box-bit circuit recovers DC component through the output of case position vision signal, one the tunnel sends into synchronizing separator circuit comprises the video input that is linked in sequence through separated in synchronization, video output, buffer, filter, amplifier and detecting amplifier shaping, by detecting amplifier output composite synchronizing pulse, as the time synchronized benchmark of singlechip CPU and random data encryption generator circuit.Send into the single-chip microcomputer gate array simultaneously.Singlechip CPU produces random number according to internal processes and randomizer, thereby produce scrambled code control randomizer, the synchronizing signal and the data base level that add the DC component startup random digit encryption generator output paraphase of box-bit circuit at random suppress compress paraphase through this processing of circuit with synchronous head to scrambling formation circuit, form scrambling, produce a descrambling control signal simultaneously, realized scrambling video thereby output to data encryption modulator III.
The operation principle of scrambling of the present invention and the operation principle of descrambling are basic identical, and descrambling is the inverse process of scrambling.
The descrambling controller of rear end of the present invention is another utility application system " non-some mode TV frequently adds the descrambling line concentration controller " that adopts the applicant, comprise signal distributor, amplifier, decoder, the signal filtering level regulator, enciphered data is extracted, pseudo-random signal identification, CPU computing microprocessor, descrambling scrambling indication, signal generator, high-frequency tuning, output matching network, for radio television signal, divide two-way through distributor: the one tunnel sends into the amplifier with the control of AGC automatic gain, and the TV signal after amplifying is after SAW (Surface Acoustic Wave) filter ZI filtering, send data decoder through vibration, mixing, filtering, amplify shaping, conversion solves data-signal box coded signal and finishes the deciphering decoding, one tunnel signal filtering level adjustment of regulating unified level after the cable TV signal with scrambling carries out filtering is delivered to enciphered data and is extracted circuit, enter pseudo-random signal identification again, the random signal of identification front end scrambling is also taken out pseudo-random signal and is carried out separated in synchronization, the descrambling control signal that extracts enters the CPU microprocessor, demodulate the information signal of the address code that comprises the user of encryption and state information sign indicating number etc. from data decoder, send in the CPU microprocessor, handle through the CPU microprocessor again, the descrambling time sequential pulse of output band address information produces or does not produce corresponding descrambling digital signal to signal generator, and in high-frequency tuner, recover or do not recover former TV signal, recover former TV signal and give the user through output matching network.And for cable TV signal, divide send into high-frequency tuner at three the tunnel: the one tunnel through distributor, one the tunnel sends into amplifier, one tunnel signal filtering level adjustment of regulating unified level after the cable TV signal with scrambling carries out filtering is delivered to enciphered data and is extracted circuit, enter pseudo-random signal identification again, the descrambling control signal that extracts enters the CPU microprocessor, demodulate the information signal of the address code that comprises the user of encryption and state information sign indicating number etc. from data decoder, send in the CPU microprocessor, handle through the CPU microprocessor again, the descrambling time sequential pulse of output band address information produces or does not produce corresponding descrambling digital signal to signal generator, and in high-frequency tuner, recover or do not recover former TV signal, recover former TV signal and give the user through output matching network.
The present invention takes the synchronous head of vision signal is suppressed compression and paraphase at random, thereby reach the purpose of scrambling and transmission data, only carry out the decay compression paraphase of amplitude in the line blanking period of TV signal at random synchronizing signal on vision carrier frequency to TV signal, it is descending with the TV channel signal of scrambling simultaneously encrypted data signal to be modulated at certain channel, so just make this system guarantee the fail safe of descrambling, install and use more conveniently, do not need to change the equipment of cable TV station.
The generation that disorderly connects phenomenon was drawn in stealing signal or private in the middle of the present invention stopped fully, descrambling need not the set-top box in a family, and is with low cost per family, the cost performance height, user susceptible to user acceptance does not have instructions for use, i.e. manipulator top box no longer, once mandate, descrambling is watched automatically, and descrambling is reliable, unauthorized persons can't obtain visual normal image, and fail safe is good, a coaxial line house lead in is only arranged, there is not the problem of cracking, the integrated level height, scrambling and descrambling adopt dedicated logic circuit respectively, components and parts have been reduced, just maintenance capacity significantly reduces, and can carry out the function expansion simultaneously, carries out segmentation control.
The present invention is equally applicable to the toll administration of MMDS transmission system.
Accompanying drawing and drawing explanation:
The flow diagram of Fig. 1 cable TV method for scrambling
Fig. 2 front end scrambling functional-block diagram
Fig. 3 frame synchronization functional-block diagram
Fig. 4 scrambling functional-block diagram
Fig. 5 descrambling controller principle block diagram
Fig. 6 descrambling controller electrical schematic diagram
Embodiment:
The descrambling controller of rear end of the present invention is positioned at the outdoor of controlled user and constitutes the aggregate device that the user watched radiofrequency signal of being controlled in 2-24 road is carried out group's decoding, and be subjected to the front-end computer mandate addressing control in the scrambling apparatus of front end to provide descrambling to restore, recover to be attenuated the synchronous head of compression.
As Fig. 1,2 the present invention are made up of the scrambling apparatus of front end and the descrambling controller two large divisions of rear end, the scrambling apparatus of front end is by scrambling/Frame Synchro, the data encryption processor, single-chip microcomputer and adjacent channel modulator are formed, it is characterized in that: after the vision signal of each channel is carried out a row correction synchronously of signal through the frame synchronization time-base circuit in scrambling/Frame Synchro, be corrected into unified synchronous and in-phase signal, carrying out synchronous scrambling through the data encryption processor handles, video tv signal is divided into two-way: one road signal is through decay, after the compression paraphase, being sent into adjacent channel modulator by the vision signal of scrambling mixes, be mixed into one road cable TV signal through the front end blender and send in the cable television network, arrive each user's descrambling controller again; The demodulation under the control of single-chip microcomputer of another road separates a trip composite signal and directly sends into adjacent channel modulator as benchmark, deliver to user's descrambling controller again through the front end blender, be subjected to front-end computer mandate addressing control to provide descrambling to restore, recover to be attenuated the synchronous head of compression.
The effect of descrambling of the present invention is a Conditional Access, realizes the toll administration of system.
Operation principle as Fig. 3 time base correction/Frame Synchro of the present invention is: in the scrambled television system, its signal source is diversified, as video tape recorder, video disc player, gamma camera, satellite receiver, aerial TV signal, microwave signal, mobile television unit signal etc., their time reference or clock frequency are returned variant, this small difference will be brought very big difficulty to the reduction of the descrambling after the scrambling, this will the time proofread and correct on the base, make all synchronous heads all at same position.The present invention will scrambling the encoded device of television video frequency signal carry out the A/D conversion, analog signal is carried out digitized processing, and one by one deposit jumbo digital storage device in, the data of each sampling of vision signal are written into the presumptive address of memory, writing address signal is to be formed by the synchronizing signal control of separating in the vision signal of importing, the every frame video signal of data that can store a frame video signal to its digital storage device of frame synchronization repeats to store by same address, when every new frame video signal arrives, just replace the information of original addressed memory storage.So writing data just means with the data before the new data replacement.When outputting video signal, the data of memory are read one by one by reading sequence of addresses, and recover original analog signal through decoder D/A conversion.And read address signal is that to be subjected to singlechip CPU and local reference synchronizing signal be sequential control shaping, to form the vision signal of standard, so just reached synchronous head at the same position homophase, synchronously, export by driver again.
Operation principle as Fig. 4 data encryption processor of the present invention is: comprise that input coupling, case position current potential, separated in synchronization, singlechip CPU, random digit are encrypted generator, scrambling forms circuit, output.Video standard signal by time base correction/frame synchronization output is divided into two-way through input matching circuit, one the tunnel sends into box-bit circuit recovers DC component through the output of case position vision signal, one the tunnel sends into synchronizing separator circuit comprises the video input that is linked in sequence through separated in synchronization, video output, buffer, filter, amplifier and detecting amplifier shaping, by detecting amplifier output composite synchronizing pulse, as the time synchronized benchmark of singlechip CPU and random data encryption generator circuit.Send into the single-chip microcomputer gate array simultaneously.Singlechip CPU produces random number according to internal processes and randomizer, thereby produce scrambled code control randomizer, the synchronizing signal and the data base level that add the DC component startup random digit encryption generator output paraphase of box-bit circuit at random suppress compress paraphase through this processing of circuit with synchronous head to scrambling formation circuit, form scrambling, produce a descrambling control signal simultaneously, realized scrambling video thereby output to data encryption modulator III.
The operation principle of scrambling of the present invention and the operation principle of descrambling are basic identical, and descrambling is the inverse process of scrambling.
As Fig. 5, the descrambling controller of 6 rear ends of the present invention is another utility application systems " non-some mode TV frequently adds the descrambling line concentration controller " that adopt the applicant, comprise signal distributor, amplifier, decoder, the signal filtering level regulator, enciphered data is extracted, pseudo-random signal identification, CPU computing microprocessor, descrambling scrambling indication, signal generator, high-frequency tuning, output matching network, for radio television signal, divide two-way through distributor: the one tunnel sends into the amplifier with the control of AGC automatic gain, and the TV signal after amplifying is through the sound table and after the filter ZI filtering, send data decoder through vibration, mixing, filtering, amplify shaping, conversion solves data-signal box coded signal and finishes the deciphering decoding, one tunnel signal filtering level adjustment of regulating unified level after the cable TV signal with scrambling carries out filtering is delivered to enciphered data and is extracted circuit, enter pseudo-random signal identification again, the random signal of identification front end scrambling is also taken out pseudo-random signal and is carried out separated in synchronization, the descrambling control signal that extracts enters the CPU microprocessor, demodulate the information signal of the address code that comprises the user of encryption and state information sign indicating number etc. from data decoder, send in the CPU microprocessor, handle through the CPU microprocessor again.
Claims (3)
1, cable TV scrambling and descrambling control system, form by the scrambling apparatus of front end and the descrambling controller two large divisions of rear end, the scrambling apparatus of front end is made up of scrambling/Frame Synchro, data encryption processor, single-chip microcomputer and adjacent channel modulator, it is characterized in that: the descrambling controller of rear end is positioned at the outdoor of controlled user and constitutes the aggregate device that the user watched radiofrequency signal in control 2-24 road is carried out group's decoding, and be subjected to the front-end computer mandate addressing control in the scrambling apparatus of front end to provide descrambling to restore, recover to be attenuated the synchronous head of compression; Described descrambling controller comprises signal distributor, amplifier, decoder, the signal filtering level regulator, enciphered data is extracted, pseudo-random signal identification, CPU computing microprocessor, descrambling scrambling indication, the descramble signal generator, high-frequency tuning, output coupling distribution network, the signal distributor front end is connected with signal input part, signal filtering respectively with the signal filtering level regulator, the input of amplifier and high-frequency tuner is connected, signal filtering is connected with the input of pseudo-random signal identification, pseudo-random signal identification is connected with CPU computing microprocessor, the output of amplifier is connected with the input of decoder, an output of decoder is connected with the input of high-frequency tuner, another interface is connected with CPU computing microprocessor, CPU computing microprocessor is connected with the descramble signal generator, is connected with output coupling distribution network.
2, a kind of cable TV scrambling and descrambling control system according to claim 1, it is characterized in that: after the vision signal of each channel is carried out a row correction synchronously of signal through the frame synchronization time-base circuit in scrambling/Frame Synchro, be corrected into unified synchronous and in-phase signal, carrying out synchronous scrambling through the data encryption processor handles, video tv signal is divided into two-way: one road signal is through decay, after the compression paraphase, being sent into adjacent channel modulator by the vision signal of scrambling mixes, be mixed into one road cable TV signal through the front end blender and send in the cable television network, arrive each user's descrambling controller again; The demodulation under the control of single-chip microcomputer of another road separates a trip composite signal and as the direct adjacent channel modulator of benchmark, deliver to user's descrambling controller again through the front end blender, be subjected to front-end computer mandate addressing control to provide descrambling to restore, recover to be attenuated the synchronous head of compression.
3, a kind of cable TV scrambling and descrambling control system according to claim 1, the data encryption processor comprises the input coupling, the clamp current potential, separated in synchronization, singlechip CPU, random digit is encrypted generator, scrambling forms circuit, output, it is characterized in that: the video standard signal by time base correction/frame synchronization output is divided into two-way through input matching circuit, one the tunnel sends into clamp circuit recovers DC component through clamp output vision signal, one the tunnel sends into synchronizing separator circuit comprises the video input that is linked in sequence through separated in synchronization, video output, buffer, filter, amplifier and detecting amplifier shaping, by detecting amplifier output composite synchronizing pulse, time synchronized benchmark as singlechip CPU and random data encryption generator circuit, send into the single-chip microcomputer gate array simultaneously, singlechip CPU produces random number according to internal processes and randomizer, thereby produce scrambled code control randomizer, the synchronizing signal and the data base level that add the DC component startup random digit encryption generator output paraphase of box-bit circuit at random suppress compress paraphase through this processing of circuit with synchronous head to scrambling formation circuit, form scrambling, produce a descrambling control signal simultaneously, output to data encryption modulator (III) thus realized scrambling to video.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011087102A CN100442838C (en) | 2001-08-08 | 2001-08-08 | Cable TV control technology added with de-interference |
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| CNB011087102A CN100442838C (en) | 2001-08-08 | 2001-08-08 | Cable TV control technology added with de-interference |
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| CN1406067A CN1406067A (en) | 2003-03-26 |
| CN100442838C true CN100442838C (en) | 2008-12-10 |
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| CN100433123C (en) * | 2004-12-31 | 2008-11-12 | 张群 | Secrecy display method and apparatus for screen |
| CN1937759B (en) * | 2005-10-31 | 2010-08-11 | 康佳集团股份有限公司 | In-hand key digital television signal encryption system |
| JP5242924B2 (en) * | 2007-02-26 | 2013-07-24 | Ｎｅｃディスプレイソリューションズ株式会社 | Video display system, video signal transmitter and video display device |
| CN102164304B (en) * | 2011-02-23 | 2013-08-14 | 中国电子科技集团公司第三十六研究所 | Encrypting identification intercutting-preventing method for broadcasting program based on satellite transmission |
| CN102123001B (en) * | 2011-02-23 | 2012-11-21 | 浙江广播电视集团 | Inter-cut resisting system of digital satellite broadcasting (DSB) transmission |
| CN104363524A (en) * | 2014-10-30 | 2015-02-18 | 成都康特电子高新科技有限责任公司 | Video scrambling system with road right management function |
| CN106888053B (en) * | 2017-03-14 | 2023-05-02 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed all-optical data real-time encryption/decryption system and method based on composite logic |
| CN117097928B (en) * | 2023-10-18 | 2024-02-06 | 深圳市广为通信技术有限公司 | Optical scrambling unidirectional cable television encryption billing system |
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