发明授权
US06487363B1 Video duplication control signal, video playback device, video recording device, information superimposing and extracting device and video recording medium
失效
视频复制控制信号，视频播放设备，视频录像设备，信息叠加和提取设备以及录像介质
- 专利标题： Video duplication control signal, video playback device, video recording device, information superimposing and extracting device and video recording medium
- 专利标题（中）： 视频复制控制信号，视频播放设备，视频录像设备，信息叠加和提取设备以及录像介质
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申请号： US09696845申请日： 2000-10-26
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公开(公告)号： US06487363B1公开(公告)日： 2002-11-26
- 发明人: Akira Ogino , Takehiro Sugita , Takashi Usui
- 申请人： Akira Ogino , Takehiro Sugita , Takashi Usui
- 优先权： JP8-298180 19961022
- 主分类号： H04N591
- IPC分类号： H04N591
摘要：
A playback device 10 generates a pseudo random noise (PN) code with a start timing based on a video sync signal, and generates a PN inverse code which has a reverse polarity to that of the PN code with a timing based on the video sync signal. An anti-duplication control signal is spectrally spread using this PN code, superimposed on the video signal and supplied to a recording device. A PN inverse code which is the same as the PN inverse code used in the playback device is also generated in the recording device based on the video sync signal, and reverse spectral spread is performed using this PN inverse code.