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1. 发明授权

US3580998A Video multiplexer-switcher with sequence recycling upon loss of video 失效
标题翻译：视频多路复用器切换器，带有序列的视频回放
公开(公告)号：US3580998A
公开(公告)日：1971-05-25
申请号：US3580998D
申请日：1968-12-18
申请人： DIEBOLD INC
发明人： HAMMOND ROBERT A , PRESTA EUGENE A
IPC分类号： H04N5/268 , H04N7/18 , H04N7/02 , H04N7/08
CPC分类号： H04N7/181 , H04N5/268
摘要： A plurality of television cameras such as in a closed circuit television system for industrial plant security are provided with a monitoring system including a control module and a plurality of switching modules, one for each camera, and also a single monitoring means such as a television receiver or a video tape recorder or both, at which signals or pictures from the cameras appear sequentially. The monitoring system includes means for enabling the picture from the cameras to be displayed at the monitor successively each for a selected desired length of time; or for enabling any camera to be removed in effect from the system by pressing a button; or for enabling any selected camera to remain connected to the monitor continuously or for any desired period of time merely by the operation of pushbuttons. Flexibility is provided in the system by utilizing monostable regenerative circuits in each video switching module to determine the length of time the corresponding camera remains operatively connected to the monitor and by successively triggering successive switching modules so that a system may be assembled with any desired number of cameras and switching modules. A bistable regenerative circuit is employed in the control module as a clock. Loss of synchronization between the cameras by the monitor is avoided by switching at electronic speeds.

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