KR950022941A - Anti-recording signal detection system - Google Patents

Anti-recording signal detection system Download PDF

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Publication number
KR950022941A
KR950022941A KR1019930027805A KR930027805A KR950022941A KR 950022941 A KR950022941 A KR 950022941A KR 1019930027805 A KR1019930027805 A KR 1019930027805A KR 930027805 A KR930027805 A KR 930027805A KR 950022941 A KR950022941 A KR 950022941A
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KR
South Korea
Prior art keywords
signal
recording
pulse
gate
recording signal
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KR1019930027805A
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Korean (ko)
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KR960015508B1 (en
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임한섭
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배순훈
대우전자 주식회사
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Priority to KR1019930027805A priority Critical patent/KR960015508B1/en
Publication of KR950022941A publication Critical patent/KR950022941A/en
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Publication of KR960015508B1 publication Critical patent/KR960015508B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • 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
    • H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal

Abstract

본 발명은 녹화방지신호 시스템에 관한 것으로, 특히, 녹화방지신호를 검출하여 녹화가 금지된 비디오테이프의 무단복사를 방지하는 회로에서 수직동기신호에서 부터 일정시간의 펄스를 발생시켜 이를 카운트함으로써 출력된 캐리출력을 사용하여 녹화방지신호를 검출하는 것이다. 즉, 입력된 영상신호가 클램핑되고 수직동기신호가 추출되어 녹화방지신호 게이트펄스가 생성되고 2진카운터 및 피크검출부를 통해 녹화방지신호가 있을때 하이로 출력하고 녹화방지신호가 없을때 로우로 출력하여 검출된 출력을 기록계가 제어하여 녹화방지신호를 검출해 내는 시스템이다.The present invention relates to an anti-recording signal system. In particular, a circuit for detecting an anti-recording signal and preventing unauthorized copying of a video tape for which recording is prohibited is generated by generating a predetermined time pulse from a vertical synchronization signal and counting the pulse. The carry output is used to detect an anti-recording signal. In other words, the input video signal is clamped and the vertical synchronization signal is extracted to generate a video protection signal gate pulse and output high when there is a video protection signal through the binary counter and peak detector, and low when there is no video protection signal. The recorder controls the detected output to detect the video protection signal.

Description

녹화방지신호 검출 시스템Anti-recording signal detection system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 시스템 구성도,1 is a system configuration diagram of the present invention,

제4도는 제1도에 대한 시스템의 파형도,4 is a waveform diagram of the system relative to FIG.

제5도는 제2도에 대한 시스템의 파형도.5 is a waveform diagram of a system relative to FIG.

Claims (3)

녹화방지신호가 있는 영상신호가 기록매체에 입력되어 자동이득조정장치(AGC) 및 E-E계 등을 거쳐 검출된 녹화방지신호가 기록계에 입력되어 입력영상 신호가 기록되지 못하도록 하는 시스템에 있어서, 영상입력신호가 클램프(100)를 거치면서 동기선단이 클램핑되고 복합동기분리부(200)에서 영상신호 중의 복합동기신호가 분리되어 입력된 복합동기신호에서 수직동기 신호만을 분리하는 수직동기분리부(300)와, 상기 분리된 수직동기신호의 상승단에서부터 16H 기간의 펄스를 발생하는 제1단안정멀티바이브레이터(400)와, 상기 분리된 수직동기신호의 상승단에서부터 7.5H 기간의 펄스를 발생하는 제2단안정멀티바이브레이터(500)와, 상기 제1단안정멀티바이브레이터(400) 및 제2단안정멀티바이브레이터(500)로부터의 16H 및 7.5H 기간의 펄스를 입력받아 녹화방지신호 게이트펄스를 생성하는 EX-OR게이트(600)와, 상기의 분리된 복합동기신호중에서 녹화방지신호 게이트펄스 동안의 녹화방지신호 펄스만을 분리하는 제1AND게이트(700)와, 상기 EX-OR게이트(600)로부터의 녹화방지신호 게이트펄스를 미분하는 미분기(900)와, 상기 미분기(900) 출력을 기준전압과 비교하여 상승단 검출펄스를 클리어펄스로 출력하는 비교기(1000)와, 클리어펄스 입력시 카운터 값이 클리어된 후에 녹화방지신호 펄스를 카운트하는 4비트 2진카운터(800)와, 상기 4비트 2진카운터(800)로부터의 신호를 피크검출하여 녹화방지신호가 없는 경우는 로우로 출력하고 녹화방지신호가 있는 경우는 하이로 출력하는 피크검출부(1200)가 구비되어 이루어진 것을 특징으로 하는 녹화방지신호 검출 시스템.In a system in which an image signal having an anti-recording signal is input to a recording medium, and an anti-recording signal detected through an automatic gain control device (AGC), an EE system, or the like is input to the recording system so that an input image signal cannot be recorded. As the signal passes through the clamp 100, the synchronous front end is clamped and the composite synchronous separation unit 200 separates the composite synchronous signal among the image signals to separate only the vertical synchronous signal from the input composite synchronous signal 300. And a first single-stable multivibrator 400 for generating a pulse of 16H period from the rising end of the separated vertical synchronization signal, and a second for generating a pulse of 7.5H period from the rising end of the separated vertical synchronization signal. The recording room receives 16H and 7.5H period pulses from the monostable multivibrator 500 and the first monostable multivibrator 400 and the second monostable multivibrator 500. An EX-OR gate 600 for generating an earth signal gate pulse, a first AND gate 700 for separating only an anti-recording signal pulse during the anti-recording signal gate pulse from the separated composite synchronization signal, and the EX-OR A differentiator 900 for differentiating the anti-recording signal gate pulse from the gate 600, a comparator 1000 for outputting the rising edge detection pulse as a clear pulse by comparing the output of the differentiator 900 with a reference voltage, and a clear pulse. 4-bit binary counter 800 that counts anti-recording signal pulses after the counter value is cleared at the input, and signals from the 4-bit binary counter 800 are peaked, and low when there is no anti-recording signal. And a peak detection unit (1200) outputting a high signal when there is an anti-recording signal. 제1항에 있어서, 녹화방지신호 게이트펄스를 수직동기신호의 상승단에서 16H 기간에 해당되는 펄스를 직접 이용하는 것과, 4비트 2진카운터(800)대신에 5비트 2진카운터(810)를 사용하여 녹화방지신호 검출을 출력하는 것을 특징으로 하는 녹화방지신호 검출 시스템.The method of claim 1, wherein the anti-recording signal gate pulse is directly used at a rising end of the vertical synchronization signal for a 16H period, and a 5-bit binary counter 810 is used instead of the 4-bit binary counter 800. Outputting a video protection signal detection system. 제1항 또는 제2항에 있어서, 2진카운터(800,810)의 출력이 녹화방지신호 게이트 펄스 기간동안만 출력되도록 하는 제2AND 게이트(1100)를 더 구비한 것을 특징으로 하는 녹화방지신호 검출 시스템.3. The system according to claim 1 or 2, further comprising a second AND gate (1100) for outputting the binary counter (800,810) only during the anti-recording signal gate pulse period. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930027805A 1993-12-15 1993-12-15 A system for detecting recording prevention signal KR960015508B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930027805A KR960015508B1 (en) 1993-12-15 1993-12-15 A system for detecting recording prevention signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930027805A KR960015508B1 (en) 1993-12-15 1993-12-15 A system for detecting recording prevention signal

Publications (2)

Publication Number Publication Date
KR950022941A true KR950022941A (en) 1995-07-28
KR960015508B1 KR960015508B1 (en) 1996-11-14

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