KR940004968Y1 - Multi-descrambling apparatus of catv - Google Patents
Multi-descrambling apparatus of catv Download PDFInfo
- Publication number
- KR940004968Y1 KR940004968Y1 KR2019880019148U KR880019148U KR940004968Y1 KR 940004968 Y1 KR940004968 Y1 KR 940004968Y1 KR 2019880019148 U KR2019880019148 U KR 2019880019148U KR 880019148 U KR880019148 U KR 880019148U KR 940004968 Y1 KR940004968 Y1 KR 940004968Y1
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- South Korea
- Prior art keywords
- filter
- amplifier
- descrambler
- output
- signal
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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
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 블록다이어그램.1 is a block diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1,1' : 선택스위치 2,4,7,9,12,14,16 : 필터1,1 ': Selection switch 2,4,7,9,12,14,16: Filter
3,8,10,13,17 : 증폭기 5 : 믹서3,8,10,13,17: amplifier 5: mixer
6 : 발진기 11 : 감쇄기6: oscillator 11: attenuator
15 : AGC검파기 20 : 제1디스크램블러15 AGC detector 20: first descrambler
30 : 제2디스크램블러 40 : 에어방송라인30: second descrambler 40: air broadcasting line
본 고안은 유료 유선 TV방송시스팀에 있어서, 비가입자의 무료시청을 방지하기 위한것으로 가입자측 컨버터에서 방송신호를 복호화할때 적용되는 유선 TV시스팀용 멀티디스크램블러에 관한 것이다.The present invention relates to a multi-descrambler for a wired TV system, which is applied to decoding a broadcast signal in a subscriber-side converter in order to prevent free viewing of non-subscribers in a paid wired TV broadcasting system.
일반적으로 유선 TV방송이 유료방송인 경우 센터측에서는 TV방송신호를 부호화하여 송출하고 가입자측에서 보유하게되는 컨버터에서는 상기 부호화된 TV방송신호를 복호화하여 시청하도록함으로써, 비가입자의 무료시청을 방해하기위한 시스팀이 필요하게 된다.In general, when wired TV broadcasting is paid broadcasting, the system encodes and transmits the TV broadcasting signal on the center side, and the converter retained on the subscriber side decodes the encoded TV broadcasting signal for viewing, thereby preventing the unsubscribed free viewing. This is necessary.
그러나, 에어(Air)방송인 경우 센터측에서 의도적으로 방송신호를 스크램블하여 송출할 필요는 없게된다.However, in the case of air broadcasting, it is not necessary to intentionally scramble and transmit a broadcast signal from the center side.
이러한 경우, 즉 에어방송중에는 스크램블러와 디스크램블러가 불필요하게 된다.In this case, that is, the scrambler and the descrambler are unnecessary during air broadcasting.
본 고안은 이상의 제반문제점을 고려하여 창안해 낸 것으로, 복수개의 디스크램블러(센터측인 경우는 스크램블러)와 에어방송수신용 라인을 임의로 선택할수 있는 연동스위치를 디스크램블러 입출력단에 두어 가입자가 센터측의 방송방식에따라 임의로 선택하여 시청할수 있게되는 유선 TV시스템용 멀티디스크램블러를 제공하는데 목적이 있다.The present invention was devised in consideration of the above-mentioned problems, and the subscriber has the center side by placing a plurality of descramblers (scrambler in the case of the center side) and an interlock switch at the descrambler input / output stage that can arbitrarily select an air broadcasting line. It is an object of the present invention to provide a multi-discambler for a wired TV system that can be arbitrarily selected and viewed according to the broadcasting method of the present invention.
이하 첨부한 도면에 따라 본 고안의 일실시예를 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
제1도에 도시하고 있는 바와같이, 제1디스크램블러(20)와 제2디스크램블러(30)와 에어방송라인(40)이 방송신호입출력단(18,19)에 연결된 선택스위치(1,1')에 의해 연동되어 해당모드가 선택되어지도록 연결구성한다.As shown in FIG. 1, the selector switches 1 and 1 in which the first descrambler 20, the second descrambler 30, and the air broadcast line 40 are connected to the broadcast signal input / output terminals 18 and 19. As shown in FIG. Configure the connection so that the relevant mode is selected by interlocking with ').
사인파로 스크램블된 방송신호를 디스크램블하는 상기 제1디스크램블러(20)는 선택위치(1)의 단자(a)를 통하여 들어오는 입력신호는 필터(2), 증폭기(3), 필터(4)를 통하여 믹서(5)에서 발진기(6)의 발진주파수와 혼합된 후 필터(7), 증폭기(8), 필터(9), 증폭기(10), 감쇄기(11)를 차례로 거쳐 상기 선택스위치(1)와 연동되는 선택 스위치(1')의 단자(a')을 통하여 출력되게 연결구성한다.The first descrambler 20 which descrambles the broadcast signal scrambled with a sine wave, inputs the input signal through the terminal (a) of the selection position (1) to filter (2), amplifier (3), filter (4). After mixing with the oscillation frequency of the oscillator 6 in the mixer (5) through the filter (7), amplifier (8), filter (9), amplifier (10), attenuator (11) in turn through the selection switch (1) It is configured to be output through the terminal (a ') of the selection switch (1') interlocked with.
상기 증폭기(10)의 출력은 필터(12), 증폭기(13), 필터(14), AGC검파기(15), 필터(16), 증폭기(17)를 차례로 통하여 상기 증폭기(8)의 이득조절 신호로 피이드백되게 연결구성한다.The output of the amplifier 10 is the gain control signal of the amplifier 8 through the filter 12, amplifier 13, filter 14, AGC detector 15, filter 16, amplifier 17 in order Make a connection with feedback.
상기 제2디스크램블러(30)는 상기 제1디스크램블러(20)와 다른 방식의 디스크램블러이다.The second descrambler 30 is a descrambler different from the first descrambler 20.
이와같이된 본 고안의 작용 및 효과를 상세히 설명하면 다음과 같다.Referring to the operation and effects of the present invention as described in detail as follows.
제1도에서, 사인파로 스크램블된 방송신호를 수신하고자할 경우에는 연동되는 선택스위치(1,1')의 단자(a,a')에 의해 제1디스크램블모드가 선택된다.In FIG. 1, when a broadcast signal scrambled with a sine wave is to be received, the first descramble mode is selected by terminals a and a 'of the select switches 1 and 1' that are interlocked.
따라서, 입력단(18)을 통해 들어오는 방송신호는 필터(2)와 증폭기(3)와 필터(4)를 거쳐 믹서(5)에서 발진기(6)의 발진주파수와 혼합된다.Therefore, the broadcast signal coming through the input stage 18 is mixed with the oscillation frequency of the oscillator 6 in the mixer 5 through the filter 2, the amplifier 3, and the filter 4.
상기 믹서(5)에서 발생된 주파수는 필터(7)와 증폭기(8)와 필터(9)와 증폭기(10)와 통상 2,3,4채널로 고정된 감쇄기(11)를 차례로 통하여 디스크램블된 방송신호로 출력단(19)에 내보내지게된다.The frequency generated in the mixer 5 is descrambled through the filter 7, the amplifier 8, the filter 9, the amplifier 10, and the attenuator 11, which is usually fixed in 2, 3, 4 channels. The broadcast signal is sent to the output terminal 19.
이때, 증폭기(10)의 출력은 필터(12)와 증폭기(13)와 필터(14)를 차례로 거치면서 진폭변조된 음성캐리어가 AGC검파기(15)에서 검파된다.At this time, the output of the amplifier 10 passes through the filter 12, the amplifier 13, and the filter 14, and the amplitude-modulated voice carrier is detected by the AGC detector 15.
상기 AGC 검파기(15)에서 검파된 스크램블된 신호가 필터(16)와 증폭기(17)를 통하여 상기 증폭기(8)의 이득조절신호로 피이드백된다.The scrambled signal detected by the AGC detector 15 is fed back to the gain control signal of the amplifier 8 through the filter 16 and the amplifier 17.
상기 피이드백되는 신호는 출력반송파와 반대 위상을 가지게되므로 증폭기(9)의 출력레벨은 증폭기(19)의 이득조절신호레벨과 같아지게되어 디스크램블된다.Since the feedback signal has a phase opposite to that of the output carrier, the output level of the amplifier 9 becomes equal to the gain control signal level of the amplifier 19 and is descrambled.
한편, 방송신호가 스크램블되지않는 에어방송인 경우 선택스위치(1,1')를 절환하여 그들의 단자(b,b')에 위치시키면, 라인(40)이 입출력단(18,19)에 연결되어 에어방송이 그대로 수신가능하게 된다.On the other hand, in the case of air broadcasting in which the broadcast signal is not scrambled, when the selector switches 1 and 1 'are switched and positioned at their terminals b and b', the line 40 is connected to the input / output terminals 18 and 19 to provide air. The broadcast can be received as it is.
또한, 상기 선택스위치(1,1')를 절환하여 그들의 단자(C,C')에 위치시키면 제2디스크램블모드가 선택되어 제1디스크램블러(20)와 다른 방식의 제2디스크램블러(30)에 의해 디스크램블링을 하게된다.In addition, when the selector switches 1 and 1 'are switched to the terminals C and C', the second descramble mode is selected so that the second descrambler 30 which is different from the first descrambler 20 is selected. ) To descramble.
또, 선택스위치(1,1')의 단자를 확장하고 또다른 방식의 디스크램블러를 다수 설치하는 것도 가능하게 된다.It is also possible to expand the terminals of the selector switches 1 and 1 'and to provide a plurality of descramblers of another method.
이상에서 설명한 바와같은 본 고안은 이러한 시스팀을 컨버터에 구현할 경우 연동되는 선택스위치의 조작만으로 여러가지 방식으로 스크램블된 신호를 디스크램블하는것이 가능할 뿐만아니라 에어방송의 수신도 가능하게되는 효과가 있게된다.As described above, when the system is implemented in a converter, not only the descrambling of the scrambled signal can be performed in various ways but also the reception of an air broadcast by only operating the selector to be interlocked.
특히, 본 고안에 적용된 사인파디스크램블러는 수직 또는 수평동기신호에 스크램블된 신호를 동기시켜 효율적으로 디스크램블링하게되므로, 유료유선TV 방송시스팀의 활성화 및 관리의 용이화를 가져오게된다.In particular, the sine wave descrambler applied to the present invention is effectively descrambled by synchronizing a scrambled signal with a vertical or horizontal synchronous signal, thereby facilitating activation and management of the pay-wired TV broadcasting system.
또한 이러한 시스팀은 쌍방향유선 TV 시스팀구축에 적용가능하며, 이경우 데이터통신시의 보안성이 향상되는 효과도 얻을수 있게된다.In addition, such a system can be applied to the construction of an interactive cable TV system, and in this case, the security of data communication can be improved.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880019148U KR940004968Y1 (en) | 1988-11-26 | 1988-11-26 | Multi-descrambling apparatus of catv |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880019148U KR940004968Y1 (en) | 1988-11-26 | 1988-11-26 | Multi-descrambling apparatus of catv |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900011144U KR900011144U (en) | 1990-06-04 |
| KR940004968Y1 true KR940004968Y1 (en) | 1994-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880019148U KR940004968Y1 (en) | 1988-11-26 | 1988-11-26 | Multi-descrambling apparatus of catv |
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| Country | Link |
|---|---|
| KR (1) | KR940004968Y1 (en) |
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1988
- 1988-11-26 KR KR2019880019148U patent/KR940004968Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR900011144U (en) | 1990-06-04 |
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