公开(公告)号：CA1095164A

公开(公告)日：1981-02-03

申请号：CA274475

申请日：1977-03-22

Applicant: SONY CORP

Inventor： MORIO MINORU ,  KAMBARA MASAHIRO

IPC: H04N1/23 ,  G11B20/02 ,  H04N5/91 ,  H04N5/913 ,  H04N7/16

Abstract: S0891 METHOD OF AND APPARATUS FOR MODIFYING A VIDEO SIGNAL TO PREVENT UNAUTHORIZED RECORDING AND REPRODUCTION THEREOF A method of and apparatus for modifying a video signal such that a video picture can be reproduced by a video display device in response to the modified video signal, but if the modified video signal is transmitted and then recorded on a video signal recorder, a satisfactory video picture cannot be reproduced if that recorded modified video signal subsequently is played back. A pulse whose amplitude is substantially equal to the peak white level of the video signal is inserted into respective horizontal blanking intervals of the video signal. If this modified video signal is recorded on a conventional type of video signal recorder, the presence of the inserted pulse signal is detected by an automatic gain control (AGC) detector which, in turn, controls an AGC amplifier to substantially attenuate the modified video signal which then is recorded.

公开(公告)号：CA1088665A

公开(公告)日：1980-10-28

申请号：CA274334

申请日：1977-03-21

Applicant: SONY CORP

Inventor： MORIO MINORU ,  KAMBARA MASAHIRO

IPC: H04N1/23 ,  G11B5/027 ,  G11B20/02 ,  H04N5/91 ,  H04N5/913 ,  H04N1/44

Abstract: METHOD OF AND APPARATUS FOR MODIFYING A VIDEO SIGNAL TO PREVENT UNAUTHORIZED RECORDING AND REPRODUCTION THEREOF A method of and apparatus for modifying a video signal such that a video picture can be reproduced on a television receiver in response to the modified video signal, but if the modified video signal is transmitted and then recorded on a video signal recorder, an accurate video picture cannot be reproduced if that recorded modified video signal subsequently is played back. The vertical blanking interval containing one set of equalizing pulses followed by a set of vertical synchronizing pulses followed by another set of equalizing pulses is modified by replacing a portion of the vertical synchronizing pulses and a portion of the set of equalizing pulses following the vertical synchronizing pulses with simulated equalizing pulses in at least some of the vertical blanking intervals. The amplitude and frequency of the simulated equalizing pulses are equal to that of the actual equalizing pulses. In one embodiment, the modified video signal is transmitted via, for example, cable or RF transmission. In another embodiment, the modified video signal is recorded on a master recording medium. If the master recording medium subsequently is reproduced, the resulting, reproduced modified video signal can be transmitted for video display. However, if a copy of the master recording medium is made, an accurate video picture cannot be reproduced from subsequent reproduction of the copy medium. -i-

公开(公告)号：DE2906770A1

公开(公告)日：1979-08-23

申请号：DE2906770

申请日：1979-02-21

Applicant: SONY CORP

Inventor： MORIO MINORU ,  NAKAMURA TADAHIKO ,  KAMBARA MASAHIRO ,  KUBOTA YUKIO

IPC: H04N5/7826 ,  H04N5/783 ,  H04N5/93 ,  H04N7/01 ,  H04N9/79 ,  H04N5/02 ,  H04N5/78

Abstract: In a video signal reproducing apparatus for converting a first video signal having a first field frequency to a second video signal having a second field frequency, there are provided a tape scanning device which is made movable in a direction perpendicular to the recording track on a tape, a system for controlling the speed of the scanning device, a system for shifting the scanning device in the aforesaid direction according to the difference between the first and second field frequencies, in order to skip or repeat selected fields so that the video signal is reproduced with the second field frequency. Also provided is a system for converting the number of lines contained in one field of the first video signal. In the above converting system there is included a memory, and the first video signal is written into the memory and read out therefrom so that a predetermined number of lines of the first video signal are discarded or repeated and the reproduced video signal has the required number of lines for each field of the second video signal.

公开(公告)号：CA1056946A

公开(公告)日：1979-06-19

申请号：CA239155

申请日：1975-11-07

Applicant: SONY CORP

Inventor： MORIO MINORU ,  KAMBARA MASAHIRO

IPC: H04N5/92 ,  H04N9/83 ,  H04N9/86 ,  H04N9/898 ,  H04N5/76 ,  G11B15/18

Abstract: A system for producing video signals recorded on a magnetic recording medium as a suppressed-carrier modulated signal in which the video information is carried primarily on only one sideband and the frequency of the suppressed carrier is within the band occupied by the video signals prior to modulation. Jitter components in the reproduced signals are substantially cancelled out.

公开(公告)号：DE2741029A1

公开(公告)日：1978-03-23

申请号：DE2741029

申请日：1977-09-12

Applicant: SONY CORP

Inventor： KUBOTA YUKIO ,  MORIO MINORU ,  OKADA HIDEHIKO ,  KAMBARA MASAHIRO

IPC: H04N5/7826 ,  G11B5/027 ,  G11B5/588 ,  G11B15/467 ,  H04N5/78

Abstract: A video signal reproducing system having a magnetic head deflector for automatic head scan tracking, the deflector being displaced corresponding to an error signal obtained from crosstalk pilot signals in a reproduced video signal.

公开(公告)号：DE2740770A1

公开(公告)日：1978-03-16

申请号：DE2740770

申请日：1977-09-09

Applicant: SONY CORP

Inventor： KAMBARA MASAHIRO ,  MORIO MINORU ,  OKADA HIDEHIKO ,  KUBOTA YUKIO

IPC: H04N5/91 ,  G11B5/027 ,  G11B5/588 ,  G11B15/467 ,  H04N5/78