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 tapeInfo
- 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
Links
Landscapes
- Television Signal Processing For Recording (AREA)
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.
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62187683A JP2533330B2 (en) | 1987-07-29 | 1987-07-29 | Duplicate-prerecorded video tape |
AT88112128T ATE143557T1 (en) | 1987-07-29 | 1988-07-27 | METHOD FOR COPY PROTECTING A PRE-RECORDED VIDEO TAPE |
CA000573207A CA1337496C (en) | 1987-07-29 | 1988-07-27 | Copy protected pre-recorded videotape |
ES88112128T ES2091747T3 (en) | 1987-07-29 | 1988-07-27 | PROTECTION PROCEDURE AGAINST COPYING OF A PRE-RECORDED VIDEO TAPE. |
DE3855568T DE3855568T2 (en) | 1987-07-29 | 1988-07-27 | Method for copy protection of a pre-recorded video tape |
EP88112128A EP0301504B1 (en) | 1987-07-29 | 1988-07-27 | Method of copy protecting a pre-recorded videotape |
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 |
GB8818073A GB2207797B (en) | 1987-07-29 | 1988-07-29 | Copy protected pre-recorded videotape |
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 |
US07/225,741 US5179452A (en) | 1987-07-29 | 1988-07-29 | Method for producing copy protected recorded videotape having uncopyable vertical synchronizing signal partition |
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)
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 |
-
1987
- 1987-07-29 JP JP62187683A patent/JP2533330B2/en not_active Expired - Lifetime
Patent Citations (3)
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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