KR960014685B1 - System of scramble and descramble - Google Patents

Abstract

mixing n broadcasting channels of a broadcasting station to a time division, executing a scramble of one channel type which the n broadcasting channels are arranged to a format in constant sequence, and rearranging and descrambling the mixing sequence of the scrambled broadcasting sequence into the original sequence at a subscriber.

Description

Scrambled and Descrambled Devices and Devices for Preventing Paying of TV Pay

1 is a block diagram of a scrambler block of a pay TV prevention wiretap prevention apparatus of the present invention.

FIG. 2 is a block diagram illustrating a descrambler block of a pay TV prevention wiretap prevention apparatus according to the present invention.

Figure 3a is a signal timing diagram scrambled two channels in accordance with the present invention.

3b is a signal timing diagram in which two channels are descrambled according to the present invention.

* Explanation of symbols for main parts of the drawings

1: inversion means 2: channel processor

3: frame synchronization means 4: channel combination means

5 channel mixing means 6 central processing unit

7: data modem 8: modem receiver

9: central processing unit 10: key matrix

11: subscriber ID register 12: channel detection means

13: tuner 14: converter

The present invention relates to a scrambler (SCRAMBLE) and a descramble (DESCRAMBLE) method and apparatus for preventing illegal eavesdropping of pay TV broadcasts, and in particular, a plurality of channels per frame of each channel The present invention relates to a method and apparatus for scrambled and descrambled video signals in a manner of transmitting, receiving, and restoring the same.

In recent years, due to the increase in the distribution of TV sets combined with cable TV reception, other free channels except for scrambled broadcasting channels can be watched when the cable TV line of the conventional cable TV system is connected to the TV line of the apartment or building. As a result, wiretapping can be achieved without paying a subscription fee, and the ease of wiretapping will interfere with the operation of a comprehensive cable broadcasting station operated by the income of the subscription fee of cable TV broadcasting subscribers. There were problems such as frequent interruptions of the tracks caused by wiretap prayers who were connected to the cable TV broadcasting lines buried underground, which hindered the smooth broadcasting.

The conventional broadcast signal scramble and descramble method proposed in view of the above point line cuts the video signal around an arbitrary point of one horizontal line, and the video signal section and the doubling timing of the previous timing centered on the cutting point. It is common to use a line rotation scheme in which a video signal section is replaced with each other to scramble and transmit a video signal, and a receiver receives information about a cutting point from a broadcasting station and restores a scrambled signal to an original signal.

However, the line rotation method as described above is difficult to maintain a high level of security because the technique is too well known, and also a method of scramble and descramble an arbitrary cutting point on a horizontal one line. It is a technology that it is difficult to fundamentally solve all the problems described above because the image quality is deteriorated due to signal modulation and cannot be coped with enough for illegal eavesdropping.

Moreover, in order to prevent eavesdropping as described above, all channels of the cable TV broadcast must be scrambled and transmitted. However, due to the cost, a general cable TV broadcast channel is usually 20 or more unscrambled channels and 2 to 3 scrambles. Since the pay channel is being broadcast, the difficulty in operating pay TV broadcasting is increasing, and when all channels are scrambled by the line rotation method, the picture quality is degraded, which makes it difficult to provide high definition images. .

Therefore, the present invention performs scrambling for all TV broadcast channels transmitted through the cable TV broadcasting line, and scrambles all channels at a low cost by taking a scramble method for each channel and frame unit in a mixed form of each channel. An object of the present invention is to provide a scrambled and descrambled method and apparatus for preventing wiretap (TV) broadcasting eavesdropping, which enables a high level of security maintenance.

In addition, the present invention enables to achieve the effect of preventing illegal eavesdropping at a lower cost than the line rotation method by scrambled and transmitted a plurality of TV broadcast channels at the same time, and the cutting generated when performing the modulation of the existing horizontal 1 line An object of the present invention is to provide a scrambled and descrambled method and apparatus for preventing wiretap (TV) broadcasting eavesdropping, which can prevent a deterioration of image quality at a point and provide a high quality image.

In addition, the present invention scrambles a TV broadcast signal, and mixes and modulates each channel with a frame adjacent to the other adjacent channels so as to perform scramble, so that the receiver of an eavesdropper connected to the cable broadcasting line cannot watch TV broadcast. An object of the present invention is to provide a scrambled and descrambled method and apparatus for preventing wiretap of TV pay TV, which can maintain high security and incompatibility.

Hereinafter, with reference to the accompanying drawings will be described a scramble and descramble method and apparatus for preventing wiretap (TV) broadcasting eavesdropping of the present invention for achieving the above object as follows.

First, the scrambled and descrambled methods for preventing pay TV broadcast eavesdropping of the present invention will be described. In this case, scrambled by mixing n broadcast channels in time division, and rearranges the mixing order of the mixed broadcast channels in the original order. It is a scrambled and descrambled method for preventing wiretap (TV) broadcasting eavesdropping, characterized by descramble.

That is, the transmitting side (broadcasting station) mixes n broadcasting channels in time division, and executes scramble of a form in which one channel is configured in a format in which n broadcasting channels are arranged in a predetermined order, and the receiving side (subscriber) The scrambling and descrambling method for preventing TV eavesdropping, which is characterized by descrambling by rearranging the mixing order of broadcast channels in an original order.

In addition, in mixing the n broadcast channels, a scrambled and descrambled method for preventing wiretap (TV) broadcasting eavesdropping is characterized by taking 1 frame image of each channel and mixing them by time division.

In addition, when the n broadcast channels are mixed by rearranging and rearranged, the rearranged mixing time is varied, and the variable information can be transmitted to each subscriber and used as descramble information. TV) A scrambled and descrambled method for preventing broadcasting eavesdropping.

In addition, the scrambling and descrambling method for preventing pay TV broadcast eavesdropping is characterized by inverting each of the n broadcast channels and mixing and rearranging them.

Referring to the configuration of a scramble and descramble device according to the scramble and descramble method for preventing pay TV broadcast eavesdropping of the present invention as described above, as shown in FIG. Inverting means (1) for polarizing the video signal for each CHn and supplying it to the channel processor (2), and for modulating the video signal for each of the n channels (CH1-CHn) inverted by the inverting means (1). A processor 2, frame synchronization means 3 for timing-matching a frame of a video signal for each channel modulated by the channel processor 2, and each channel of a type synchronized with the frame synchronization means 3; Channel combining means 4 for outputting one channel as a video signal having n channel frames combined by frame-combining the respective video signals, and broadcasting each channel combined by the channel combining means 4 for transmission. Channel mix A central processing unit (16) for instructing the channel combining means (4) of the frame combining time and providing decryption key information to the data modem (7); and the central processing unit (16). Under the control, the data modem 7 modulates the information related to the channel combination and the decryption key information and provides it to the subscriber side, the modem receiver 8 which detects the decoder information received at the subscriber side, and the modem receiver 8 A central processing unit (9) for receiving channel selection information and subscriber ID registration information inputted by the user of the received decryption key information and outputting channel selection control information for descrambling; 9) and a subscriber ID registration unit 11 for registering a unique ID number for each subscriber and inputting it to the central processing unit 9, and for descramble of the central processing unit 9; Receive channel tuning control information A channel detector 12 for performing restoration and rearrangement control of the mixed channel, a tuner 13 tuned to a broadcast signal of a channel selected by a user under the control of the channel detector 12, and the tuner 13 And a converter 14 for demodulating a video signal of a channel tuned to a channel.

The scramble and descramble method of the video signal by the scramble and descramble device of the present invention configured as described above will be described with reference to FIGS. 1 to 3.

First, the scramble operation by the scrambler of FIG. 1 will be described as follows.

The inverting means 1 receives the video signals of n channels CH1-CHn, respectively, and inverts the (+) and (-) polarities to supply them to the channel processor 2, wherein the control of the central processing unit 6 is performed. Accepts and executes configuration inversion.

The video signal of each channel inverted by the inverting means (1) is modulated for each channel in the channel processor (2), and the modulated video signal of each channel is supplied to the frame synchronizing means (3).

The frame synchronizing means 3 supplies the channel combining means 4 with timing matching of the frames of the input video signals for each channel.

The channel combining means 4 receives the combination instruction data of the central processing unit 6, and mixes the video signals of each channel matched frame by frame unit to scramble the rearranged video signals for each channel.

For example, as shown in (a) of FIG. 3, the video signal frames CH1F1-CH1Fn of the first channel CH1 and the video signal frames CH2F1-CH2Fn of the second channel CH2 are framed with each other. By mixing, the video signals of the scrambled first channel CH1 and the second channel CH2 are configured.

Referring to the rearranged video signals, the first channel CH1 has some video frames CH2F2, which are between the video frames CH1F1, CH1F3, CH1F5, ... corresponding to its own channel. CH2F4, CH2F4, ... are mixed and arranged to create a new array of video signal frames, and this video signal (channel CH1) is scrambled so that viewing is impossible because the video signal frame of the second channel is mixed Modulated into a form.

The scrambled video signal is mixed by the channel mixing means 5 for each channel CH1-CHn and transmitted to the subscriber side. At this time, the CPU 6 receives scrambled information related to the channel combination, that is, which channel of the channel. Information indicating whether or not it is scrambled in units of time (time division timing rules) is modulated by the data modem 7 and transmitted to the subscriber side together with the scrambled video signal through the channel mixing means 5.

In addition, as described above, the second channel CH2 is scrambled (regularly) in a part of the video frame of the first channel CH1 mixed, and the scramble is executed in the same manner for the n channels and sent to the subscriber side. Will be.

In this case, if the mixing time (timing and order) of the image frames to be mixed and rearranged in the CPU 6 is randomly changed, a more perfect scramble effect can be ensured.

As described above, since the scrambled video signal transmitted to the subscriber is a signal-modulated signal (time division channel scrambled through mixing and rearranging) on a channel-by-channel basis, even if a third party tunes and views the video signal, The image is sufficiently scrambled to be recognizable, thus maintaining a high level of security and paying no fee-unregistered-illegal eavesdroppers because all channels (CH1-CHn) are scrambled. They will not be able to watch pay TV broadcasts.

However, the subscriber receiving the transmission information related to the scramble converts the scrambled video signal into the original signal by the descrambler of the present invention as shown in FIG. 2, thereby enabling normal broadcast viewing. Is as follows.

On the subscriber side, the received video signal (scrambled video signal) distributed from the splitter 15 is received by the modem receiver 8 and the scramble related information (key data) transmitted from the scramble, that is, a certain time unit (time division timing) of a channel. Demodulating the information indicating whether it has been scrambled as a rule) and informing the CPU 9 of this data.

On the other hand, the user is given a unique subscriber ID number promised with the pay TV station and registered in the subscriber ID registration unit 11 on the receiver side to secure information that can prove that he is a legitimate presser. Input the channel to watch using 10).

The channel selection command written to the key matrix 10 is recognized by the central processing unit 9, and the central processing unit 9 checks the subscriber ID registered in the subscriber ID registration unit 11, and if the subscriber is a suitable subscriber, the modem. By using the data (key data) input from the receiving section 8, time-division timing information and mixed channel information for restoring a channel corresponding to the channel selected by the key matrix 10 are supplied to the channel detecting means 12. give.

The channel detecting means 12 has the information input from the central processing unit 9 and controls the tuner 13 to tune the image frame of the channel selected by the user, and inputs it to the TV receiver through the converter 14 so that the normal image is obtained. Display the signal.

That is, as shown in (a) of FIG. 3, when the user commands the selection of the first channel CH1, the first timing is used to construct a complete video signal (frame arrangement) of the first channel CH1. The first frame CH1F1 of one channel CH1 is selected and output, and at the next timing, the second frame CH1F2 of the first channel mixed with the second channel CH2 is selected and output, and c. At the timing, the third frame CH1F3 of the first channel CH1 is selected and outputted, and at the next timing, the fourth frame CH1F4 of the first channel mixed with the second channel CH2 is selected. All video signal frames CH1F1-CH1Fn of the first channel CH1 are rearranged to form an intact video signal of the first channel CH1 as shown in FIG.

This operation is similarly performed for the second channel CH1 so that the video signal of the scrambled second channel CH2 as shown in (a) of FIG. 3 is also intact as shown in (c) of FIG. The output is composed of (CH2F1-CH2Fn).

As described above, the operation is performed in the same manner with respect to the video signal of the n-th channel CHn to descramble the n-channel TV broadcast signal in response to a user's channel selection request.

As described above, the scramble and descramble method and apparatus for preventing pay TV broadcast eavesdropping of the present invention can scramble all channels of the pay broadcast because the scramble is performed on a channel basis, and thus, highly secured. It is possible to prevent illegal eavesdropping, and because it is scrambled by rearranging images in units of frames, the image of one frame can be preserved intact, thereby minimizing deterioration of image quality when descrambled. There is an effect such as to provide an image quality of.

In addition, since illegal eavesdropping is prevented, anxiety about illegal eavesdropping can be solved at a paid broadcasting station, and the effects of illegal eavesdropping can be prevented.

In addition, through the random variable control of the time division timing it is possible to maintain a higher security, it is possible to provide a scramble and descrambler that can ensure a high degree of reliability.

Claims (6)

The transmitting side (broadcasting station) mixes n broadcasting channels in time division and executes scrambles in which one channel is configured in a format in which n broadcasting channels are arranged in a predetermined order, and the receiving side (subscriber) performs the scrambled broadcasting channel. A scrambled and descrambled method for preventing wiretap (TV) broadcasting eavesdropping, wherein the mixed order is de-scrambled in an original order. The scramble and descramble method of claim 1, wherein in mixing the n broadcast channels, one frame image of each channel is taken and mixed in time division. The method according to claim 1 or 2, wherein when remixing and rearranging n broadcast channels by time division, the rearranged mixing time is varied, and the time variable information is transmitted to each subscriber for use as descramble information. Scrambled and descrambled method for preventing pay-TV broadcast eavesdropping, characterized in that. The scramble and descramble method of claim 1 or claim 2, wherein the n broadcast channels are inverted and then mixed and rearranged. a channel processor (2) for modulating the video signals for each of the n channels (CH1-CHn), frame synchronization means (3) for timing-matching the frames of the video signals for each channel modulated by the channel processor (2); And channel combination means (4) for frame-combining the video signals for each channel in the form synchronized by the frame synchronizing means (3) and outputting one channel as a video signal in which n channel frames are combined. A channel mixing means 5 for mixing and transmitting each broadcast channel combined by the combining means 4, and instructing the channel combining means 4 of the frame combining time, and decrypting key information to the data modem 7; A central processing unit (16) to be provided, a data modem (7) which modulates information related to a channel combination and decryption key information under the control of the central processing unit (16) and provides it to the subscriber side, and the decoder received at the subscriber side. Detect information Is a central processing unit for receiving channel selection information and subscriber ID registration information input by the user of the modem receiving unit 8 and the decryption key information received by the modem receiving unit 8 and outputting channel selection control information for descramble. (9), a key matrix 10 through which a user inputs a channel selection command to the central processing unit 9, and a subscriber ID registration unit 11 which registers a unique ID number for each subscriber and inputs it to the central processing unit 9; Channel control means for receiving the channel tuning control information for the descrambling of the central processing unit 9 and executing the restoration and rearrangement control of the mixed channel. And a tuner 13 for tuning the broadcast signal of the channel selected by the user, and a converter 14 for demodulating the video signal of the channel tuned by the tuner 13. Scramble for Descramble device. The pay TV broadcast tapping method according to claim 5, further comprising inverting means (1) for inverting polarity of the video signals for each of the n channels (CH1-CHn) and supplying them to the channel processor (2). Scrambled and descrambled devices for prevention.