KR940006739B1 - Descramble system of catv - Google Patents

Descramble system of catv Download PDF

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KR940006739B1
KR940006739B1 KR1019880016444A KR880016444A KR940006739B1 KR 940006739 B1 KR940006739 B1 KR 940006739B1 KR 1019880016444 A KR1019880016444 A KR 1019880016444A KR 880016444 A KR880016444 A KR 880016444A KR 940006739 B1 KR940006739 B1 KR 940006739B1
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stage
address code
program code
data
code
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KR1019880016444A
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KR900011297A (en
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조명래
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삼성전기 주식회사
서주인
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable

Abstract

an address code coupler, a program code coupler and a data adder for receiving an input signal passing through a video detector; a first comparator for comparing an address code of the address code coupler passing through an address code store stage with an address code of a subscriber address code store stage and providing a comparison result to an address code updata stage; and a data compensator for receiving a program code of the program code coupler through a program code store stage and a second comparator controlled by an enable bit of the address code updata stage and providing its output to the data adder to be descrambled, thereby improving the security of cable TV broadcasting.

Description

유선 TV용 디스크램블러시스팀Descrambler System for Cable TV

[도면의 간단한 설명][Brief Description of Drawings]

제1도는 본 발명의 블록다이어그램.1 is a block diagram of the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

1 : 비디오검출단 2 : 어드레스코드커플링단1: Video detection end 2: Address code coupling end

3 : 어드레스코드스토어단 4 : 가입자어드래스코드스토어단3: Address code store stage 4: Subscriber address code store stage

5 : 비교단 6 : 프로그램코드 스토어단5: comparison step 6: program code store step

8 : 어드레스코드 업데이트단 9 : 비교단8: address code update stage 9: comparison stage

10 : 데이터보상단 11 : 데이터합성단10: Data Compensation Unit 11: Data Synthesis Unit

[발명의 상세한 설명]Detailed description of the invention

본 발명은 유선 TV 방송시스팀에 관한 것으로 특히 비가입자에 의한 프리미엄채널시청을 방지할 수 있는 유선 TV용 디스크램블러시스팀에 관한 것이다. 일반적으로 유선 TV 방송회사측에서는 비가입자에 의한 사용료지불 계약없이 프리미엄채널을 시청하는 것을 방지하기 위하여 방송신호를 암호화하게 된다. 이경우에 사용되는 방식으로 통상 강제동기방식이나 비디오 인버젼방식을 이용하여 방송신호를 스크램블링하게 된다.The present invention relates to a cable TV broadcasting system, and more particularly to a cable TV descrambler system that can prevent premium channel viewing by non-subscribers. In general, the cable TV broadcasting company encrypts the broadcast signal in order to prevent the premium channel from being viewed without a non-subscriber payment contract. In this case, the broadcast signal is scrambled using a forced synchronization method or a video inversion method.

그러나, 상기에서 예로든 스크램블링방식은 각각 방송신호를 일정레벨만큼 강제동기시켜 송출하거나 또는 비디오신호를 반전시켜 송출하게 되는 단순한 방식에 불과한 것이어서, 이를 디스크램블링 할 수 있는 디스크램블러의 제작이 용이하기 때문에, 비가입자에 의한 고의적인 불법시청을 효과적으로 방지할 수 없는 문제점이 있게 된다.However, the above-described scrambling method is merely a simple method of forcibly transmitting broadcast signals by a predetermined level or inverting and transmitting video signals. However, there is a problem that cannot effectively prevent intentional illegal viewing by non-subscribers.

본 발명의 목적은 유선 TV 방송회사측에서 제공하게 되는 디스크램블러가 아니면 해당 유선 TV 방송을 시청할 수 없도록 하고, 또한 상기 유선 TV 방송회사측에서 송출하는 스크램블링된 TV 방송신호를 디스크램블링 할 수 있는 디스크램블러를 고의적인 불법시청을 목적으로 제작하는 것이 불가능하게 되는 유선TV용 디스크램블러시스팀을 제공하는데 있다.Disclosure of Invention An object of the present invention is to provide a descrambler that is not provided by the cable TV broadcasting company, so that the user cannot watch the cable TV broadcasting. It is to provide a descrambler system for cable TV, which makes it impossible to manufacture a scrambler for the purpose of deliberate illegal viewing.

이하 첨부한 도면에 따라 본 발명을 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

제1도에서 도시하고 있는 바와같이, 방송국측에 의해 스크램블링된 입력신호(in)는 비디오검출단(1)을 통하여 어드레스코드커플링단(2)과 프로그램코드커플링단(6)과 데이터합성단(11)으로 제공되게 연결구성하고, 상기 어드레스코드커플링단(2)에서 출력되는 신호는 어드레스코드스토어단(3)을 거쳐 비교단(5)에서 가입자어드레스코드스토어단(4)의 출력신호와 비교된 후, 어드레스코드 업데이트단(8)으로 출력되게 연결구성한다.As shown in FIG. 1, the input signal in scrambled by the broadcasting station side is connected to the address code coupling stage 2, the program code coupling stage 6 and the data synthesis stage through the video detection stage 1. 11), and the signal output from the address code coupling stage 2 is compared with the output signal of the subscriber address code store stage 4 at the comparison stage 5 via the address code store stage 3; After that, it is configured to be output to the address code update stage 8.

상기 프로그램코드 커플링단(6)에서 출력되는 신호는 프로그램코드스토어단(7)을 거쳐 비교단(9)에서 상기어드레스코드업데이트단(8)의 출력신호와 비교된후, 데이터보상단(10)으로 출력되게 연결구성한다. 상기 데이터보상단(10)에서 출력되는 신호는 상기 비디오검출단(1)의 출력신호와 함께 데이터합성단(11)에서 합성된 후 출력신호(out)로 출력되게 연결구성한다. 이와같이 구성된 본 발명의 작용 및 효과를 상세히 설명하면 다음과 같다.The signal output from the program code coupling stage 6 is compared with the output signal of the address code update stage 8 in the comparison stage 9 via the program code store stage 7, and then the data compensation stage 10. Configure the connection to output. The signal output from the data compensator 10 is combined with the output signal of the video detector 1 and then synthesized by the data synthesizer 11 to be output as an output signal out. Referring to the operation and effect of the present invention configured as described above in detail.

첨부도면에서, 스크램블링된 입력신호(in)는 비디오검출단(1)에서 특정채널의 비디오를 검출하게 된다. 또한 상기 비디오검출단(1)을 통한 TV 신호에 실린 어드레스코드는 어드레스코드커플링단(2)에서 커플링되어 어드레스코드스토어단(3)에 저장된다. 상기 어드레스코드스토어단(3)에서 출력되는 어드레스코드는 미리 세팅되어진 가입자 어드레스코드스토어단(4)에서의 어드레스코드와 비교단(5)에서 비교출력된다.In the accompanying drawings, the scrambled input signal in causes the video detector 1 to detect video of a particular channel. The address code carried on the TV signal through the video detection stage 1 is also coupled to the address code coupling stage 2 and stored in the address code store stage 3. The address code output from the address code store stage 3 is compared with the address code in the subscriber address code store stage 4 which has been set in advance and outputted from the comparison stage 5.

따라서, 가입자어드레스코드가 스크램블링된 TV 신호에 실린 어드레스코드와 일치하지 않을 경우에는 비교단(5),에서는 출력(인에이블비트)이 나타나지 않게 된다. 반면에, 비교단(5)에서 비교되는 어드레스코드가 일치하면 상기 비교단(5)에서는 입력 해당어드레스코드가 출력되며, 이에따라 어드레스코드 업데이트단(8)에 보관중이던 과거의 데이터가 업데이트되어 인에이블비트가 발생된다.Therefore, when the subscriber address code does not match the address code carried on the scrambled TV signal, the output (enable bit) does not appear in the comparison stage 5. On the other hand, if the address codes compared in the comparison unit 5 match, the corresponding address code is output from the comparison unit 5, and accordingly, the past data stored in the address code update unit 8 is updated and enabled. A bit is generated.

한편, 비디오검출단(1)을 거친 입력신호의 버터컬 인터벌(Vertical interval)에 암호화된 프로그램또는 프로그램코드스토어단(7)에서 커플링되어 프로그램코드스토어단(7)에 스토어된다. 상기 프로그램코드스토어단(7)에서 출력되는 프로그램코드데이터는 비교단(9)을 통하여 데이터보상단(10)으로 제공되게 되는데, 이때 비교단(9)에서는 어드레스코드업데이트단(8)에서 출력되는 인에이블비트에 의해서 상기 프로그램코드스토어단(8)의 프로그램코드가 통과된다.데이터보상단(10)에서는 상기 프로그램코드를 해독하여 암호화된 정보만큼 정확하게 보상해주게 되므로, 데이터합성단(11)에서는 상기 비디오검출단(1)의 암호화된 출력신호에 상기 데이터보상단(10)에서 보상된 데이터를 합성하여 정상적으로 디스크램블된 비디오출력신호(out)를 내보내게 된다.On the other hand, it is coupled to the encrypted program or program code store stage 7 at the vertical interval of the input signal passing through the video detection stage 1 and stored in the program code store stage 7. The program code data output from the program code store stage 7 is provided to the data compensating stage 10 through the comparison stage 9, in which the comparison stage 9 is outputted from the address code update stage 8. By the enable bit, the program code of the program code store stage 8 passes. The data compensating stage 10 decrypts the program code and compensates it exactly as encrypted information. The data compensated by the data compensator 10 is combined with the encrypted output signal of the video detector 1 to output a normally descrambled video output signal out.

이상에서 설명한 바와같은 본 발명은 상기에서 예로든 가입자측에 적용되는 것 뿐만아니라 방송국측의 헤드엔드에도 그대로 적용가능하게 되며, 이에따라 유선 TV 방송의 보안성이 향상되는 효과가 나타나게 된다.As described above, the present invention can be applied not only to the subscriber side described above but also to the headend of the broadcasting station side, and thus, the security of the cable TV broadcasting is improved.

Claims (1)

유선 TV 방송시스팀에 있어서, 비디오검출단(1)을 통한 입력신호가 어드레스코드커플링단(2), 프로그램코드커플링단(6) 및 데이터합성단(11)으로 제공되게 연결하고, 어드레스코드스토어단(3)을 통한 상기 어드레스코드커플링단(2)의 어드레스코드와 가입자 어드레스코드스토어단(4)의 어드레스코드가 비교단(5)에서 비교되어 어드레스코드업데이트단(8)으로 제공되게 연결하고, 프로그램코드스토어단(7)을 통한 프로그램코드커플링단(6)의 프로그램코드가 상기 어드레스코드업데이트단(8)의 인에이블비트로 제어되는 비교단(9)을 통하여 데이터보상단(10)으로 제공되게 연결구성하고, 상기 데이터보상단(10)의 데이터보상출력과 상기 비디오검출단(1)의 스크램블입력신호가 데이터합성단(11)에서 디스크램블링되어 출력되게 연결구성하여서 되는 것을 특징으로 하는 유선 TV용 디스크램블러시스팀.In the cable TV broadcasting system, an input signal through the video detection terminal (1) is connected to be provided to the address code coupling stage (2), the program code coupling stage (6), and the data synthesis stage (11), and the address code store stage is connected. (3) the address code of the address code coupling stage (2) and the address code of the subscriber address code store stage (4) are compared at the comparison stage (5) and provided to the address code update stage (8), and The program code of the program code coupling stage 6 through the program code store stage 7 is provided to the data compensating stage 10 through the comparison stage 9 controlled by the enable bit of the address code update stage 8. And the data compensating output of the data compensating terminal 10 and the scrambled input signal of the video detecting terminal 1 are configured to be descrambled and output from the data synthesizing terminal 11. Systems for cable TV descramblers that.
KR1019880016444A 1988-12-10 1988-12-10 Descramble system of catv KR940006739B1 (en)

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KR1019880016444A KR940006739B1 (en) 1988-12-10 1988-12-10 Descramble system of catv

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KR940006739B1 true KR940006739B1 (en) 1994-07-27

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