JPS6432781A - Duplication preventing picture-recorded video tape and duplication preventing picture-recording system for video tape - Google Patents

Duplication preventing picture-recorded video tape and duplication preventing picture-recording system for video tape

Info

Publication number
JPS6432781A
JPS6432781A JP62187683A JP18768387A JPS6432781A JP S6432781 A JPS6432781 A JP S6432781A JP 62187683 A JP62187683 A JP 62187683A JP 18768387 A JP18768387 A JP 18768387A JP S6432781 A JPS6432781 A JP S6432781A
Authority
JP
Japan
Prior art keywords
pulse
vertical synchronizing
tape
video tape
vertical
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.)
Granted
Application number
JP62187683A
Other languages
Japanese (ja)
Other versions
JP2533330B2 (en
Inventor
Yasunori Takahashi
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.)
Scitec KK
Original Assignee
Scitec KK
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 Scitec KK filed Critical Scitec KK
Priority to JP62187683A priority Critical patent/JP2533330B2/en
Priority to AT88112128T priority patent/ATE143557T1/en
Priority to CA000573207A priority patent/CA1337496C/en
Priority to EP88112128A priority patent/EP0301504B1/en
Priority to DE3855568T priority patent/DE3855568T2/en
Priority to ES88112128T priority patent/ES2091747T3/en
Priority to KR1019880009539A priority patent/KR890002869A/en
Priority to AU20166/88A priority patent/AU624334B2/en
Priority to US07/225,741 priority patent/US5179452A/en
Priority to BR8803793A priority patent/BR8803793A/en
Priority to GB8818073A priority patent/GB2207797B/en
Publication of JPS6432781A publication Critical patent/JPS6432781A/en
Application granted granted Critical
Publication of JP2533330B2 publication Critical patent/JP2533330B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To prevent illegal duplication by obtaining the special constitution of a vertical synchronizing pulse in a vertical blanking section, an equalizing pulse, and a horizontal synchronizing pulse in a picture-recorded video tape for a helical scanning revolving two-head system video tape recorder. CONSTITUTION:In a vertical synchronizing signal section B in a vertical blanking section E, only a pulse BIA with the width of 1-20mu second equivalent as a vertical synchronizing pulse to be separated by a vertical synchronizing signal separating circuit is present and at least one part of all of vertical synchronizing pulses, equalizing pulses, and horizontal synchronizing pulses of the vertical blanking section records a complex video signal which is a pedestal level P or below onto at least one part of a tape. When the modification soft tape is dubbed by using two VTRs, a mechanism to separate and 1/2-frequency-devide the vertical synchronizing signal and to generate a control signal does not function and the control signal is not recorded onto an illegal copy tape. By the electric resistance and the stray capacity of a cable to connect the two VTRs, the pulse BIA is integrated and recorded onto the illegal copy tape and does not function as the vertical synchronizing signal any more.
JP62187683A 1987-07-29 1987-07-29 Duplicate-prerecorded video tape Expired - Lifetime JP2533330B2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
JP62187683A JP2533330B2 (en) 1987-07-29 1987-07-29 Duplicate-prerecorded video tape
CA000573207A CA1337496C (en) 1987-07-29 1988-07-27 Copy protected pre-recorded videotape
EP88112128A EP0301504B1 (en) 1987-07-29 1988-07-27 Method of copy protecting a pre-recorded videotape
DE3855568T DE3855568T2 (en) 1987-07-29 1988-07-27 Method for copy protection of a pre-recorded video tape
ES88112128T ES2091747T3 (en) 1987-07-29 1988-07-27 PROTECTION PROCEDURE AGAINST COPYING OF A PRE-RECORDED VIDEO TAPE.
AT88112128T ATE143557T1 (en) 1987-07-29 1988-07-27 METHOD FOR COPY PROTECTING A PRE-RECORDED VIDEO TAPE
KR1019880009539A KR890002869A (en) 1987-07-29 1988-07-28 Copy-protected video tape
AU20166/88A AU624334B2 (en) 1987-07-29 1988-07-28 Copy protected pre-recorded videotape
US07/225,741 US5179452A (en) 1987-07-29 1988-07-29 Method for producing copy protected recorded videotape having uncopyable vertical synchronizing signal partition
BR8803793A BR8803793A (en) 1987-07-29 1988-07-29 PRE-RECORDED VIDEO-TAPE PROTECTED AGAINST IMPROPER REPRODUCTION, PROCESS TO PROTECT A VIDEO-TAPE AGAINST IMPROPER REPRODUCTION AND PROCESS TO RECORD VIDEO SIGNALS ON A VIDEO-TAPE
GB8818073A GB2207797B (en) 1987-07-29 1988-07-29 Copy protected pre-recorded videotape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62187683A JP2533330B2 (en) 1987-07-29 1987-07-29 Duplicate-prerecorded video tape

Publications (2)

Publication Number Publication Date
JPS6432781A true JPS6432781A (en) 1989-02-02
JP2533330B2 JP2533330B2 (en) 1996-09-11

Family

ID=16210313

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62187683A Expired - Lifetime JP2533330B2 (en) 1987-07-29 1987-07-29 Duplicate-prerecorded video tape

Country Status (1)

Country Link
JP (1) JP2533330B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51146113A (en) * 1975-06-04 1976-12-15 Nippon Herarudo Eiga Kk Method of processing video signal for prevention of copyright infringement and device therefor
JPS52127213A (en) * 1976-04-16 1977-10-25 Sony Corp Recorded medium and its manufacture
JPS5775088A (en) * 1980-10-29 1982-05-11 Victor Co Of Japan Ltd Generation device for composite color video signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51146113A (en) * 1975-06-04 1976-12-15 Nippon Herarudo Eiga Kk Method of processing video signal for prevention of copyright infringement and device therefor
JPS52127213A (en) * 1976-04-16 1977-10-25 Sony Corp Recorded medium and its manufacture
JPS5775088A (en) * 1980-10-29 1982-05-11 Victor Co Of Japan Ltd Generation device for composite color video signal

Also Published As

Publication number Publication date
JP2533330B2 (en) 1996-09-11

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