JPS5723366A - Reproduction preventing system of video software - Google Patents

Reproduction preventing system of video software

Info

Publication number
JPS5723366A
JPS5723366A JP9836880A JP9836880A JPS5723366A JP S5723366 A JPS5723366 A JP S5723366A JP 9836880 A JP9836880 A JP 9836880A JP 9836880 A JP9836880 A JP 9836880A JP S5723366 A JPS5723366 A JP S5723366A
Authority
JP
Japan
Prior art keywords
signal
vertical synchronizing
false vertical
recorded
reproduced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9836880A
Other languages
Japanese (ja)
Inventor
Taku Kamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9836880A priority Critical patent/JPS5723366A/en
Publication of JPS5723366A publication Critical patent/JPS5723366A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04N2005/91314—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To prevent the fact that a video signal which has been reproduced by a video tape, etc. is re-recorded to a magnetic tape, by alternately providing a section in which a false vertical synchronizing signal has been inserted and a section in which no false vertical synchronizing signal is inserted, and recording them in a recording medium. CONSTITUTION:A monostable multivibrator 31 is driven by breaking of an input signal (a), and outputs a pulse signal (b). A monostable multivibratot 32 is driven by rise-up of this signal (b), and outputs a pulse signal (c). An output (e) is obtained by taking OR of this signal (c) and an output of an unstable multivibrator 33, by an AND circuit 34. When the signal (e) is inputted to a switching circuit 17, a signal in which a false vertical synchronizing signal has been inserted intermittently is obtained. In this way, a television signal and a control signal which are recorded in a magnetic tape 21 are phase-modulated by a false vertical synchronizing signal contained in a reproduced signal.
JP9836880A 1980-07-17 1980-07-17 Reproduction preventing system of video software Pending JPS5723366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9836880A JPS5723366A (en) 1980-07-17 1980-07-17 Reproduction preventing system of video software

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9836880A JPS5723366A (en) 1980-07-17 1980-07-17 Reproduction preventing system of video software

Publications (1)

Publication Number Publication Date
JPS5723366A true JPS5723366A (en) 1982-02-06

Family

ID=14217931

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9836880A Pending JPS5723366A (en) 1980-07-17 1980-07-17 Reproduction preventing system of video software

Country Status (1)

Country Link
JP (1) JPS5723366A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5918162A (en) * 1982-07-20 1984-01-30 三菱鉱業セメント株式会社 Dielectric ceramic composition
JPS5975780A (en) * 1982-10-08 1984-04-28 ノーザン・テレコム・リミテッド Method and device for correcting video signal for inhibitingvideo signal
JPH01238287A (en) * 1988-03-18 1989-09-22 Toyo Rekoodeingu Kk Copying-preventive type magnetic tape recording device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5918162A (en) * 1982-07-20 1984-01-30 三菱鉱業セメント株式会社 Dielectric ceramic composition
JPS5975780A (en) * 1982-10-08 1984-04-28 ノーザン・テレコム・リミテッド Method and device for correcting video signal for inhibitingvideo signal
JPH0470825B2 (en) * 1982-10-08 1992-11-12 Northern Telecom Ltd
JPH01238287A (en) * 1988-03-18 1989-09-22 Toyo Rekoodeingu Kk Copying-preventive type magnetic tape recording device

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