JPS56168480A - Recorded recording medium - Google Patents

Recorded recording medium

Info

Publication number
JPS56168480A
JPS56168480A JP7179180A JP7179180A JPS56168480A JP S56168480 A JPS56168480 A JP S56168480A JP 7179180 A JP7179180 A JP 7179180A JP 7179180 A JP7179180 A JP 7179180A JP S56168480 A JPS56168480 A JP S56168480A
Authority
JP
Japan
Prior art keywords
signal
video signal
vertical synchronous
composite video
synchronous signal
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
JP7179180A
Other languages
Japanese (ja)
Inventor
Toshio Kaneshiro
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP7179180A priority Critical patent/JPS56168480A/en
Publication of JPS56168480A publication Critical patent/JPS56168480A/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

Abstract

PURPOSE:To prevent duplication by stealthy recording, by recording a composite video signal in which a disturbance signal is added to a vertical synchronous signal and thus preventing an acquisition of a normal reproduced picture in case the picture is once recorded on a VTR and then reproduced. CONSTITUTION:When the composite video signal fitted with a disturbance signal protruding large from the tip part of a vertical synchronous signal toward the outer part is recorded at the vertical synchronous signal part, by a home-use VTR fitted with a recorder providing a means so as to fix the synchronous tip part of a composite video signal to be supplied to a frequency modulator to a specific potential on a clamping circuit 15. Then, the composite video signal supplied to a frequency modulator 18 is displaced toward the video signal side at the vertical synchronous signal part. As a result, the vertical synchronous signal is lost.
JP7179180A 1980-05-29 1980-05-29 Recorded recording medium Pending JPS56168480A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7179180A JPS56168480A (en) 1980-05-29 1980-05-29 Recorded recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7179180A JPS56168480A (en) 1980-05-29 1980-05-29 Recorded recording medium

Publications (1)

Publication Number Publication Date
JPS56168480A true JPS56168480A (en) 1981-12-24

Family

ID=13470743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7179180A Pending JPS56168480A (en) 1980-05-29 1980-05-29 Recorded recording medium

Country Status (1)

Country Link
JP (1) JPS56168480A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01300686A (en) * 1988-05-28 1989-12-05 Saiteku Kk Video tape already recorded with copying preventing video recording and copying preventing video recording system for video tape
JPH05284451A (en) * 1992-04-01 1993-10-29 Imagica:Kk Method and device for inserting disturbing signal to video software for distribution, method and device for reproducing video software for distribution inserted disturbing signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01300686A (en) * 1988-05-28 1989-12-05 Saiteku Kk Video tape already recorded with copying preventing video recording and copying preventing video recording system for video tape
JPH05284451A (en) * 1992-04-01 1993-10-29 Imagica:Kk Method and device for inserting disturbing signal to video software for distribution, method and device for reproducing video software for distribution inserted disturbing signal

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