KR960043889A - Scrambler and Descrambler for Cable TV - Google Patents

Scrambler and Descrambler for Cable TV Download PDF

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Publication number
KR960043889A
KR960043889A KR1019950014369A KR19950014369A KR960043889A KR 960043889 A KR960043889 A KR 960043889A KR 1019950014369 A KR1019950014369 A KR 1019950014369A KR 19950014369 A KR19950014369 A KR 19950014369A KR 960043889 A KR960043889 A KR 960043889A
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KR
South Korea
Prior art keywords
signal
outputting
output
loading
scrambler
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Application number
KR1019950014369A
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Korean (ko)
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KR0158970B1 (en
Inventor
이진영
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배순훈
대우전자 주식회사
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Priority to KR1019950014369A priority Critical patent/KR0158970B1/en
Publication of KR960043889A publication Critical patent/KR960043889A/en
Application granted granted Critical
Publication of KR0158970B1 publication Critical patent/KR0158970B1/en

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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
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/173—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using elementary logic circuits as components
    • H03K19/1733—Controllable logic circuits
    • H03K19/1737—Controllable logic circuits using multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

본 발명은 케이블 텔레비젼의 스크램블러 및 디스크램블러에 관한 것으로, 스크램블러는, 극성 반전 영상신호 및 비반전영상신호를 선택하기 위한 제어신호를 출력하는 제어부(13)와; 상기 제어부(13)에서 출력된 제어신호에 따라 로딩신호를출력하는 로딩신호발생기(14); 상기 로딩신호에 따라 상기 랜덤 발생기(10)에서 출력된 PN_code 신호를 계수하여 계수신호를 출력하는 카운터(15) 및; 상기 카운터(15)에서 출력된 계수신호에 따라 상기 극성 반전 영상신호 및 비반전 영상신호를 선택적으로 전송하는 멀티플렉서(16)를 포함되고, 디스크램블러는, 스크램블러에서 전송된 제어신호에 따라 로딩신호를 출력하는 로딩신호발생기(23); 상기 로딩신호에 따라 랜덤 발생기(20)에서 출력된 PN_code 신호를 계수하여 계수신호를 출력하는 카운터(24) 및; 상기 카운터(24)에서 출력된 계수신호에 따라 스크램블된 영상신호를 선택적으로 출력하는멀티플렉서(25)를 포함하여 구성되어, 극성 반전 방식으로 스크램블된 영상신호를 복원할 때 발생되는 반전 영상 신호와비반전 영상 신호의 기준레벨 차이에 의해 발생되는 줄간 콘트라스트의 수를 감소시킬 수 있는 것이다.The present invention relates to a scrambler and a descrambler of a cable television. The scrambler includes: a control unit 13 for outputting a control signal for selecting a polarity inverted video signal and a non-inverted video signal; A loading signal generator 14 for outputting a loading signal according to the control signal output from the control unit 13; A counter (15) for counting the PN_code signal output from the random generator (10) according to the loading signal and outputting a count signal; And a multiplexer 16 for selectively transmitting the polarity inverted video signal and the non-inverted video signal according to the count signal output from the counter 15. The descrambler includes a loading signal according to a control signal transmitted from the scrambler. A loading signal generator 23 for outputting; A counter 24 for counting the PN_code signal output from the random generator 20 according to the loading signal and outputting a count signal; And a non-inverting video signal generated when restoring the scrambled video signal by the polarity inversion method, which includes a multiplexer 25 for selectively outputting the scrambled video signal according to the count signal output from the counter 24. It is possible to reduce the number of interline contrasts caused by the difference of the reference level of the video signal.

Description

케이블 텔레비젼의 스크램블러 및 디스크램블러Scrambler and Descrambler for Cable TV

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 따른 스크램블러 및 디스크램블러의 개략적인 구성도이다.2 is a schematic configuration diagram of a scrambler and a descrambler according to the present invention.

Claims (2)

의사 랜덤 키(PN_key)값 및 초기 위상(phase) 신호를 입력받는 한편 위상데이타를 피드백하여 의사 랜덤코드(PN_code) 신호를 연속적으로 출력하는 랜덤 발생기(10)와; 외부로부터 입력된 영상신호를 기준레벨을 기준으로 극성반전시켜 출력하는 반전기(11); 외부로부터 입력된 영상신호를 비반전시켜 출력하는 버퍼(12); 상기 반전기(11) 및 버퍼(12)에서 각각 출력된 극성 반전 영상신호 및 비반전 영상신호를 선택하기 위한 제어신호를 출력하는 제어부(13); 상기제어부(13)에서 출력된 제어신호에 따라 로딩신호를 출력하는 로딩신호발생기(14); 상기 로딩신호에 따라 상기 랜덤 발생기에서 출력된 PN_code 신호를 계수하여 계수신호를 출력하는 카운터(15) 및; 상기 카운터(15)에서 출력된 계수신호에 따라 상기 반전기(11)의 출력신호 및 버퍼(12)의 출력신호를 선택적으로 전송하는 멀티플렉서(16)를 포함하여 구성된 케이블 텔레비젼의 스크램블러.A random generator 10 which receives a pseudo random key (PN_key) value and an initial phase signal while feeding back phase data to continuously output a pseudo random code (PN_code) signal; An inverter 11 for inverting and outputting an image signal input from the outside based on a reference level; A buffer 12 for non-inverting and outputting the video signal input from the outside; A controller 13 for outputting control signals for selecting the polarity inverted video signal and the non-inverted video signal output from the inverter 11 and the buffer 12, respectively; A loading signal generator 14 for outputting a loading signal according to the control signal output from the control unit 13; A counter (15) for counting the PN_code signal output from the random generator in accordance with the loading signal and outputting a count signal; And a multiplexer (16) for selectively transmitting the output signal of the inverter (11) and the output signal of the buffer (12) according to the count signal output from the counter (15). 스크램블러에서 전송된 의사 랜덤 키(PN_key)값을 아웃밴드(모뎀)을 통하여 입력받음과 더불어 인밴드(Inband)를 통하여 전송된 위상데이타를 입력받는 한편 상기 위상데이타를 피드백하여 PN_code 신호를 연속적으로 출력하는 랜덤 발생기(20)와; 스크램블러에서 극성 반전 방식으로 스크램블 걸려 전송된 영상신호를 기준레벨을 기준으로 극성반전시켜 출력하는 반전기(21); 스크램블러에서 극성 반전 방식으로 스크램블 걸려 전송된 영상신호를 비반전시켜 출력하는 버퍼(22); 스크램블러에서 전송된 제어신호에 따라 로딩신호를 출력하는 로딩신호발생기(23); 상기 로딩신호에 따라상기 랜덤 발생기(20)에서 출력된 PN_code 신호를 계수하여 계수신호를 출력하는 카운터(24) 및; 상기 카운터(24)에서 출력된 계수신호에 따라 상기 반전기(21)의 출력신호 및 버퍼(22)의 출력신호를 선택적으로 출력하는 멀티플렉서(25)를 포함하여 구성된 케이블 텔레비젼의 디스크램블러.The PN_key value transmitted from the scrambler is input through the outband (modem), and the phase data transmitted through the inband is input while the PN_code signal is continuously output by feeding back the phase data. A random generator 20; An inverter 21 for reversing the polarity of the video signal transmitted from the scrambler by the polarity inversion scheme based on the reference level; A buffer 22 for non-inverting and outputting the video signal scrambled by the scrambler in a polarity inversion scheme; A loading signal generator 23 for outputting a loading signal according to a control signal transmitted from a scrambler; A counter 24 for counting the PN_code signal output from the random generator 20 and outputting a count signal according to the loading signal; And a multiplexer (25) for selectively outputting the output signal of the inverter (21) and the output signal of the buffer (22) according to the count signal output from the counter (24). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950014369A 1995-05-31 1995-05-31 Scrambler and descrambler of a cable television KR0158970B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950014369A KR0158970B1 (en) 1995-05-31 1995-05-31 Scrambler and descrambler of a cable television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950014369A KR0158970B1 (en) 1995-05-31 1995-05-31 Scrambler and descrambler of a cable television

Publications (2)

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KR960043889A true KR960043889A (en) 1996-12-23
KR0158970B1 KR0158970B1 (en) 1998-12-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431705B1 (en) * 2001-10-24 2004-05-24 이상원 Scrambing and descrambling device for securing communication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431705B1 (en) * 2001-10-24 2004-05-24 이상원 Scrambing and descrambling device for securing communication

Also Published As

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KR0158970B1 (en) 1998-12-15

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