CN1228751C - Signal source encoded scrambling-descrambling method and device for displaying scan image - Google Patents
Signal source encoded scrambling-descrambling method and device for displaying scan image Download PDFInfo
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- CN1228751C CN1228751C CN 00120615 CN00120615A CN1228751C CN 1228751 C CN1228751 C CN 1228751C CN 00120615 CN00120615 CN 00120615 CN 00120615 A CN00120615 A CN 00120615A CN 1228751 C CN1228751 C CN 1228751C
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Abstract
The present invention relates to an encoding type scrambling and descrambling method and a device thereof for a signal source of a scan display image. An encoding scrambling device [1] is used for scrambling and converting the signal source of the scan display image to generate a piece (field) of data characterized scrambled image single output which comprises a self scrambling information code and can be independently transferred or stored. The decoding descrambling device [3] is used for receiving a scrambled image signal through a transmission channel [2], and the scrambled image signal is combined with another part of descrambling information obtained from a channel [4] to generate an inversely converting signal to control the descrambling and the recovery of a scrambled image. The device of the present invention can be utilizes to uniformly realize the integrated condition watching management and the integrated condition playing management of image programs in various signal transmission platforms and acoustic image publish programs on an advanced information processing level.
Description
Technical field
The present invention relates to a kind of to the scanning display image add, the method and the realization system of scramble process.
Technical background
The exemplary scanning display image is television image (also comprising the image demonstration of graphoscope etc.), its basic functional principle is to move moving (being referred to as field scan) line by line and being equipped with the field of starting point and row synchronous control signal and realize that the scanning of a width of cloth or a field picture shows of (being referred to as line scanning) and vertical direction with the scanning spot pointwise in the horizontal direction of may command luminous intensity, constantly show complete graph film size or the field that some above-mentioned scan modes form on this basis more fast, utilize the visual persistence effect of human eye just to form dynamic or static continuous pictures.For certain purpose, the supplier of image will control spectators' normally watching or can not normally watch above-mentioned image frame, promptly realize having ready conditions the rating or the broadcast of having ready conditions, this disturbs and removes interference signals treatment technology problem with regard to having brought artificially to introduce in the image that scanning shows.
The scrambling mode is divided into simulation scrambling and digital interference two major types at present, the simulation scrambling is exactly some characteristics of the scanning display image that exists with analog signaling being utilized its scan image signal, the synchronizing characteristics of the frequency characteristic of the strength characteristics that shows as scanning spot, the locus characteristic of scanning display line, transmission signals and row, field signal etc., when image signal transmission, it is changed and upsets, thereby even reach make spectators not descrambling just can't normally receive or receive the purpose that also can't watch normal picture.Thus principle formed at analog television program image transmission handle such as multiple scrambling means and methods such as synchronous inhibition method, row dithering, video reversal of poles method, interference wave method of superposition.
Digital interference is exactly earlier the analog scanning display image signals to be carried out digitized sampling to handle, form the packet of normal image signal, then when these packets are transmitted, its transmission order or coding structure are upset scrambling by the agreement operation rule; Receiving end is after receiving this scrambled data streams, must carry out inverse transformation corresponding to above-mentioned scrambling algorithmic rule synchronously, in time recover original normal packet sequence or coding structure, just may in ensuing signal Processing, recover normal scanning display image.This shows that present digital interference also mainly carries out at the transmission course of signal, with this ultimate principle also just formed now such as: D-MAC system scrambling mode, multiple numerals such as DVB system and ATST system Digital Television add, the mode and the method for scramble process.
Can find a common ground from the above-mentioned various descrambling mode that adds and methods at the scanning display image: the starting point that is exactly its introducing interference mainly is to carry out at the transmission course of picture signal, on more basic information source aspect, do not carry out concrete each strange land scrambling separately and handle at scanning each width of cloth of display image signals or one 's picture structure, simultaneously also just can not be particularly the interference cognizance code of the minute book width of cloth or this interfere information be added wherein at each width of cloth or a field picture, realize that (need illustrate at this: the data characterizationization of indication image is different from the digitizing of image among the present invention, and is meant with one group of digital coding in the information that is equivalent to characterize on " the expression aspect " of osi model display image for the data characterizationization of each width of cloth or an interfering picture.), promptly form the holographic scrambling scan image that a width of cloth or are independently contained self scramble information.
Therefore its add, the essence of descrambling work: be exactly the transmission course that centers on picture signal, take the mode of cooperation synchronously at transmitting terminal and receiving end, picture signal is carried out forward and reciprocal transformation with an algorithmic rule simple or numerous, the relative fixed unanimity of having appointed in advance.
Given this; above-mentionedly variously add, de-scrambling method is to the existence early stage of picture signal and the picture signal that receives existing the later stage all can not form effective scrambling protection; be that aforementioned the whole bag of tricks all fails on this basic, the most essential aspect of picture structure itself to implement effective scrambling protection, thereby all unconditionally resolve the image information source itself is handled or image security problem during writing task.
Add such as existing TV, descrambling system, if will support recording function or other the pre-download storage function of user to the program image, then receiving end can only be after receiving scrambling image programs signal and in time removing scrambling, can can be general store recording means (as home video tape recording to user's output, VCD and DVD burner etc.) picture signal that can note, and can't allow picture signal under the situation that continue to keep the scrambling attitude, be the existing store recording equipment of user institute record, and provide mutually the scramble process device that should be able to non real-time synchronously recovers normal image signal.Thereby legal reception user is easy to after legal releasing scrambling the image programs signal be duplicated or copies, and then reaches the purpose of illegal sale or transfer.This also is that at present phonotape and videotape publishes and distributes a pirate more than to the greatest extent repeatly essential technique reason on the market.
On the other hand because relatively-stationary synchronized algorithm rule is often all adopted in aforesaid various its scramblings of scrambling methods and descrambling conversion, thereby also just stayed by chance that other people crack and the use value after cracking.So from preventing that image programs from removing the angle of scrambling (promptly decoding) by illegal piracy, by illegal solution; above-mentioned various scrambling methods all exist many technology limitations and leak; along with the passing of service time and the expansion of application surface; all can not provide the effective protection to the program copyright on higher level, they also all can't realize the video image program is striden the unification of a plurality of, multiple signal transmission platform, the integrated rating or the broadcast management control function of having ready conditions of having ready conditions simultaneously.
Summary of the invention
Purpose of the present invention is exactly to utilize a certain characteristic or the multifrequency nature of scanning display image signals, picture structure at each scanning width of cloth of scan image information source or scanning field, upset at random with specific coding rule, simultaneously also will this specific coding scramble information convert that corresponding signal code is inserted into this width of cloth or this quilt is disturbed in the signal structure of image to, form the data characterization scrambling image that a width of cloth or are contained self scramble information code and can independently be transmitted or store, promptly form a width of cloth or one and independently contain the holographic scrambling scan image of self scramble information, thereby finish scrambling and scramble process the scanning display image at (promptly on the semanteme and pragmatic processing aspect in image information) on the more senior information aspect.
Given this, the present invention will reach that highly reliable complex encryptions such as " machine one are close " is technical to provide a kind of new realization basis implementing " one-time pad " for relevant encryption system, simultaneously also be that all kinds of image signal transmission platforms are (as simulation and digital TV image signal transmission platform, computer internet image signal transmission platform etc.) in be that the image programs of demonstration means and audio-visual product publish and distribute program and realize unifying on more senior information processing aspect with the scan image, the incorporate rating or the broadcast management service function of having ready conditions of having ready conditions, and more preventing that illegally video frequency program is watched in deciphering on the based signal processing aspect, prevent that the pirate video frequency program of illegal copies etc. from having provided more effective technical guarantee means and realization approach.
Brief description of drawings
Fig. 1: for realizing a kind of system and device pie graph of the inventive method
Fig. 2: be the principle of work block diagram of coding scrambling apparatus shown in Figure 1
Fig. 3: be the principle of work block diagram of decoding descrambler shown in Figure 1
Fig. 4: for the television image information source is carried out a kind of embodiment of scrambling conversion by the described system and device of Fig. 1 on signal strength characteristics
Fig. 5: for the television image information source is carried out a kind of embodiment of scrambling conversion by the described system and device of Fig. 1 on signal space-time structure characteristic
Fig. 6: for the television image information source is carried out a kind of embodiment of scrambling conversion by the described system and device of Fig. 1 on the signal Synchronization characteristic
Below in conjunction with Fig. 1～Fig. 3 the inventive method and system and device are described further, and to Fig. 4--three kinds of embodiment of Fig. 6 are described further.
The best mode that carries out an invention
After the common as shown in Figure 1 signal with the scan mode display image is input to coding scrambling apparatus (1), will be under the control signal effect that the pseudo-random sequence pulse produces by predetermined scrambling algorithm routine, a certain characteristic or multifrequency nature at each width of cloth or each display image signals are carried out positive-going transition, to be this pseudo-random sequence pulses switch specific scrambling coding also simultaneously, and the specific scrambling coding of again this being represented the scrambling information converting is inserted into this width of cloth with the form of pulse code (also can comprise relative other information coded pulse codes) or this quilt is disturbed in the picture signal structure, exports this each width of cloth or each at last and all contains self scramble information code and can be disturbed picture signal by the data characterizationization that independently transmits or store.(this channel specifically can be: cable television network by transmission channel (2) to be disturbed picture signal, wireless network, computer internet, directly carry out the optical networking of exchanges data, with the image programs signal that stores is the artificial audio-visual product distribution net of carrier and the analog or digital vide player that matches etc.) (this device can be built in the receiver to send decoding descrambler (3) to, within TV, it is outer that it also can the set-top box form be installed), meanwhile (or in advance) coding scrambling apparatus (1) also will by logically independently transmitted in both directions channel (4) (this channel specifically can be: two-way HFC net, telephone network, power line network, computer internet, directly carry out the optical networking of exchanges data, the IC-card of manual delivery, movably reading and writing data indicator and register etc.) transmit to decoding descrambler (3) and to remove Descrambling Algorithms function and other relevant descrambling datas, and in decoding descrambler (3), mate compose operation with isolated specific scrambling coding together, generate the descrambling control signal with this and come to be carried out the reciprocal transformation processing, thereby recover former scanning display image signals disturbing picture signal.
The principle of work of scrambling apparatus (1) of encoding as shown in Figure 2 is: a road of plain scan display image signals is input to synchronous pseudo-random generator (1a), and pseudo-random generator (1a) will one group of pseudo-random sequence pulse of triggering for generating send scrambler (1b) under the effect of the row of this image information source, field system chronizing impulse signal synchronously; The scrambling algorithmic function F that this pseudo-random sequence pulse will extract with remarkable free the deciding of warp from scrambling algorithmic function and Descrambling Algorithms function exam pool manager (1e) in scrambler (1b)
kComputing produces scrambling control signal Q together, and gives transducer (1c), and this pseudo-random sequence pulse meanwhile also will be converted into the specific scrambling coding (T) of code form and send compositor (1d) to; Another road of plain scan display image signals then is directly inputted to transducer (1c), exports to compositor (1d) after carrying out forward scrambling conversion under the control action of above-mentioned scrambling control signal Q; Compositor (1d) then the specific scrambling coding (T) (also can comprise relative other information codings) of this width of cloth or this field is inserted into this width of cloth with the form of pulse code or this quilt is disturbed synthetic externally output in the picture signal structure, has just finished so far that a width of cloth or one are contained self scramble information code and the generative process of the data characterization scrambling image that can independently be transmitted or store.This process can be expressed as with mathematical formulae:
Q ≡ F
k(x) modq (x ∈ manifold A)
Q wherein---be the scrambling control signal, general available binary number representation.
F
k---be the scrambling algorithmic function, in scrambling algorithmic function and Descrambling Algorithms function exam pool manager (1e), have manyly in advance, and freely select by the people.
K---be the code of scrambling algorithmic function and corresponding Descrambling Algorithms function.
X---the value of specific scrambling coding (T), general available binary number representation.
Q---represent the mould value of Q and Q.
Under certain condition, scrambling algorithmic function and Descrambling Algorithms function exam pool manager (1e) also will with in advance or real-time mode by logically independently transmitted in both directions channel (4) pass to decoding descrambler (3) and remove Descrambling Algorithms function D
kAnd other relevant descrambling datas.
The principle of work of deciphering descrambler (3) as shown in Figure 3 is: the quilt that contains specific scrambling coding (T) is disturbed picture signal one tunnel and is input to separation vessel (3a), is isolated specific scrambling coding (T) and is given code translator (3b) by it; Code translator (3b) then with this specific scrambling coding (T) with in descrambling data buffer (3d), extract from the Descrambling Algorithms function D that obtains of transmitted in both directions channel (4) independently in logic
kReach other relevant descrambling datas and mate compose operation, generate descrambling control signal Q thus and go to control inverse transformer (3c) work; Another road of being disturbed picture signal then directly is sent to inverse transformer (3c), and finishes reciprocal transformation under the control action of descrambling control signal Q, thereby output recovers the former scanning display image signals of former state.This process is expressed as with mathematical formulae:
Q ≡ D
k(x) modq (x ∈ manifold A)
Q wherein---be the descrambling control signal, general available binary number representation.
D
k---be the Descrambling Algorithms function,
(binary expression), i.e. D
k(x) be F
k(x) logic NOT when binary number is expressed.
It should be noted that:
1, above-mentioned from logic independently transmitted in both directions channel (4) transmit Descrambling Algorithms function D
kAnd other relevant descrambling datas are divided into three kinds of situations for decoding descrambler (3): 1. transmit in real time, i.e. D
kAnd other relevant descrambling datas and specific scrambling are encoded (T) respectively through different channels but be sent to simultaneously and decipher descrambler (3) and finish descrambling; 2. partly transmit semireal time in advance, promptly in advance by in logic independently transmitted in both directions channel (4) remove all D to decoding descrambler (3) biography
kAnd other relevant descrambling datas, but when decoding descrambler (3) receives specific scrambling coding (T), pass the code k that represents corresponding coupling Descrambling Algorithms function again, make decoding descrambler (3) access corresponding D by k
kAnd other relevant descrambling datas carry out matching operation with specific scrambling coding (T) again and produce control signal corresponding and go control to finish descrambling work; 3. transmit in advance, be about to D
kAnd other relevant descrambling datas are sent to decoding descrambler (3) in advance, then decipher descrambler (3) when receiving specific scrambling coding (T) and other relevant descrambling datas, mate automatically and finish descrambling work.
2, the specific implementation method of above-mentioned coding scrambling apparatus (1) and decoding descrambler (3) is except that can realizing with the hardware mode of electronic circuit by the division of functional block diagram, can also realize in single-chip microcomputer or DSP by the form of coding with software, can be that hardware and part are that the mode of software etc. realizes by part also.
3, the position of inverse transformer (3c) in whole reception picture signal treatment scheme shows job step the closer to final image; then the degree of protection to picture signal is high more; because the present invention is that this implements scrambling on more basic aspect to the image information source; therefore inverse transformer (3c) and the partial function thereof among the present invention can be easier to and final demonstration link---and be that kinescope (or display screen) integrates, can provide scanning the protection of the higher safe coefficient of display image signals with this.
This embodiment is a strength characteristics of utilizing the television image luminance signal as seen from Figure 4, by the polarity of brightness Y-signal is carried out the conversion of positive negative by the encode regulation of (T) of specific scrambling, thereby upsets the demonstration of original image.In being disturbed the capable signal of every vertical blanking period n of picture signal, insert specific scrambling coded pulse, also can under the situation that not serious influence is watched, insert in the line scan signals of the leading portion of the demonstration phase of showing up or back segment, result according to this specific scrambling coding (T) calculation process under the effect of scrambling algorithm routine, determine the brightness Y-signal at capable, the m+4 behavior negative polarity row of this demonstration phase m+1, m+2 is capable, the positive polarity row (generally the demonstration phase of only being expert in carry out) of m+3 behavior after anti-phase.In this way more capable brightness Y-signal is carried out reversal, the image that then demonstrates will be a width of cloth or a very chaotic and unsettled image on brightness and color.
This embodiment is a space-time display structure characteristic of utilizing the television image luminance signal as seen from Figure 5, by brightness Y-signal scanning display line is upset each capable scanning sequencing in time by the encode information of (T) defined of specific scrambling, thereby reach the purpose that spatially upsets the image demonstration.In being disturbed the capable signal of every vertical blanking period n of picture signal, insert specific scrambling coded pulse, also can under the situation that not serious influence is watched, insert in the line scan signals of the leading portion of the demonstration phase of showing up or back segment, result according to this specific scrambling coding (T) calculation process under the effect of scrambling algorithm routine, determine that the brightness Y-signal is capable at this demonstration phase m+3, m+4 is capable, variation took place on the sequencing in sweep time the capable contrast of m+1 original signal, thereby their locus on screen display will change also.In this way to the line disturbance of more advancing, then quilt of showing of its output is disturbed image and will be beyond recognition.
Need to prove if will realize the scrambling and the descrambling conversion of this mode, the frame memory that inverse transformer (3c) in transducer (1c) in the coding scrambling apparatus (1) and the decoding descrambler (2) also need have the width of cloth or field picture signal storage ability could carry out quasi real time synchronous scrambling and descrambling conversion process to former scanning display image signals.Conduct is to the upset of picture signal on the space-time display structure simultaneously, except that the upset that can carry out between above line, after also can further carrying out the segmentation cutting to the brightness sweep signal in every row, upset sequencing sweep time of its each section more in time, thereby reach higher levels of upset effect on the space shows.
This embodiment is a synchronizing characteristics of utilizing the scanning television image signal as seen from Figure 6, by suppressing by the capable synchronous head pulse of the information of specific scrambling coding (T) regulation to the image scanning signal, make it to carry out to go normally synchronous working, thereby upset the demonstration of its image.In being disturbed the capable signal of every vertical blanking period n of picture signal, insert specific scrambling coded pulse, also can under the situation that not serious influence is watched, insert in the line scan signals of the leading portion of the demonstration phase of showing up or back segment, result according to this specific scrambling coding (T) calculation process under the effect of scrambling algorithm routine determines that this demonstration phase m+2 capable synchronous head pulse capable, that m+3 is capable is suppressed.In this way the capable synchronous head pulse of multirow is more suppressed, then to disturb image will be to twist very much with unsettled to its quilt that demonstrates.Be noted that this mode ratio is easier to recover repressed capable synchronous head pulse by other ways, thereby confidentiality is relatively poor, reaches the purpose that strengthens its whole scrambling effect thereby generally this method and aforementioned two kinds of methods or other method for scrambling can be carried out Application of composite.
It should be noted that, in the embodiment of Fig. 4, Fig. 5 and Fig. 6, its brightness Y-signal, synchronizing signal and composite signal etc. both can be simulating signals, also were digitized sampling processing after the A/D conversion and the pure digi-tal row signal, digital synchronization signal and the digital composite signal that form or corresponding digital compressed signal etc.
Claims (8)
1, a kind of method of the scanning display image being carried out scrambling and descrambling, be to adopt coding scrambling apparatus (1) and decoding descrambler (3) to carry out the course of work that cooperatively interacts between forward and reverse operation transform, it is characterized in that pseudo-random sequence pulse that the scrambling course of work produces by synchronous pseudo-random generator (1a) is with the scrambling algorithmic function F that extracts from selecting in scrambling algorithmic function and the Descrambling Algorithms function exam pool manager (1e) at the characteristics of signals of image information source
kGenerate the scrambling control signal by in scrambler (1b), carrying out the compose operation processing by predetermined scrambling algorithm routine, go plain scan display image signals that control change device (1c) comes in to input on a certain characteristic of its each width of cloth or a field signal or a few specific character, to carry out positive-going transition with this signal again, and the specific scrambling coding (T) of this scrambling control information of representative that in compositor (1d), will be converted by the pseudo-random sequence pulse and also can comprise relative other information codings, again with the form of pulse code be inserted into this by positive-going transition the picture signal structure in, thereby a synthetic width of cloth or one contain self scramble information code and can be disturbed picture signal by the data characterizationization that independently transmits or store and export; The descrambling course of work is then disturbed after picture signal sends to decoding descrambler (3), isolate the specific scrambling coding (T) of this width of cloth or this field and give code translator (3b) from its each width of cloth or a field signal by separation vessel (3a), code translator (3b) then extracts in descrambling data buffer (3d) by the scrambling apparatus (1) of encoding in advance or simultaneously from the Descrambling Algorithms function D that transmits of transmitted in both directions channel (4) independently in logic according to information that should specific scrambling coding (T)
kAnd other relevant descrambling datas, and they are mated compose operation with this specific scrambling coding (T) by predetermined Descrambling Algorithms program, produce the descrambling control signal thus and go to control inverse transformer (3c) and this width of cloth or this field data characterization are disturbed picture signal carry out reciprocal transformation, thereby recover former scanning display image signals.
2, according to the described method of claim 1, wherein said specific scrambling coding (T) is one or more groups pulse signal that produces at random, represent different scrambling control informations with the combination of its different train of impulses, and disturb picture signal with this quilt and be woven together and form the quilt independently contain sign scrambled data message code and disturb the scanning display image signals, and can be sent out or be stored with this.
3, according to claim 1 and the described method of claim 2, the wherein said scanning display image signals of being disturbed, it is characterized in that being disturbed and contain specific scrambling coding (T) in the picture signal, and pass through inverse transformer (3c) afterwards just by descrambling, disturbing picture signal at inverse transformer (3c) quilt before then is to be existed to disturb attitude all the time, and the specific scrambling coding (T) that can contain with self is accordingly preserved by general store recording method, is recovered normal display image by descrambling again to treat opportune moment.
4, according to the described method of claim 1, wherein said scrambling algorithmic function F
kAnd the Descrambling Algorithms function D that becomes the inverse transformation relation with it
kIt is characterized in that they all include a part is carried out scrambling or scramble process to picture signal indispensable information, transmit but do not disturb picture signal with this quilt, but from addition logically mutually independently bidirectional transfer of information channel (4) pass to decoding descrambler (3), mate compose operation again with this, thereby just can form a complete and indispensable descrambling control information, realize this quilt is disturbed the scramble process of picture signal.
5, a kind of device that the scanning display image is carried out scrambling and descrambling, constitute by coding scrambling apparatus (1) and decoding descrambler (3), it is characterized in that scrambling work by the pseudo-random sequence pulse that produces of pseudo-random generator (1a) synchronously in the coding scrambling apparatus (1) with the scrambling algorithmic function F that extracts from selecting in scrambling algorithmic function and the Descrambling Algorithms function exam pool manager (1e)
kGenerate the scrambling control signal by in scrambler (1b), carrying out the compose operation processing by predetermined scrambling algorithm routine, go plain scan display image signals that control change device (1c) comes in to input on a certain characteristic of its each width of cloth or a field signal or a few specific character, to carry out positive-going transition with this signal again, and the specific scrambling coding (T) of this scrambling control information of representative that in compositor (1d), will be converted by the pseudo-random sequence pulse and also can comprise relative other information codings, again with the form of pulse code be inserted into this by positive-going transition the picture signal structure in, thereby a synthetic width of cloth or one contain self scramble information code and can be disturbed picture signal by the data characterizationization that independently transmits or store and export; Descrambling work is being disturbed after picture signal sends to decoding descrambler (3), isolate the specific scrambling coding (T) of this width of cloth or this field and give code translator (3b) from its each width of cloth or a field signal by separation vessel (3a), code translator (3b) then extracts in descrambling data buffer (3d) by the scrambling apparatus (1) of encoding in advance or simultaneously from the Descrambling Algorithms function D that transmits of transmitted in both directions channel (4) independently in logic according to information that should specific scrambling coding (T)
kAnd other relevant descrambling datas, and they are mated compose operation with this specific scrambling coding (T) by predetermined Descrambling Algorithms program, produce the descrambling control signal thus and go to control inverse transformer (3c) and this width of cloth or this quilt are disturbed picture signal carry out reciprocal transformation, thereby recover former scanning display image signals.
6, according to the described device of claim 5, wherein said specific scrambling coding (T), it is characterized in that the pulse signal that one or more groups produces at random, represent different scrambling control informations with the combination of its different train of impulses, and disturb picture signal with this quilt and be woven together and form the quilt independently contain sign scrambled data message code and disturb the scanning display image signals, and can be sent out or be stored with this.
7, according to described device of claim 5 and claim 6, quilt is wherein disturbed the scanning display image signals and is characterised in that to be disturbed and contains specific scrambling coding (T) in the picture signal, and pass through inverse transformer (3c) afterwards just by descrambling, therefore disturbing picture signal at inverse transformer (3c) quilt before is to be existed to disturb attitude all the time, and can be preserved by general store recording method, can be treated that recovered normal display image by descrambling opportune moment again.
8, according to the described device of claim 5, wherein said scrambling algorithmic function F
kAnd the Descrambling Algorithms function D that becomes the inverse transformation relation with it
kIt is characterized in that they all include a part is carried out scrambling or scramble process to picture signal indispensable information, transmit but do not disturb picture signal with this quilt, but from addition logically mutually independently bidirectional transfer of information channel (4) pass to decoding descrambler (3), mate compose operation again with this, thereby just can form a complete and indispensable descrambling control information, realize this quilt is disturbed the scramble process of picture signal.
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| CN 00120615 CN1228751C (en) | 2000-12-22 | 2000-12-22 | Signal source encoded scrambling-descrambling method and device for displaying scan image |
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| CN 00120615 CN1228751C (en) | 2000-12-22 | 2000-12-22 | Signal source encoded scrambling-descrambling method and device for displaying scan image |
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