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System and method for inductive line synchronization

  • US 7,218,356 B2
  • Filed: 11/22/2005
  • Issued: 05/15/2007
  • Est. Priority Date: 04/02/2001
  • Status: Expired due to Term
First Claim
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1. A synchronized television display system comprising:

  • a plurality of cameras generating video signals;

    a monitor for displaying a video signal generated by one of said plurality of cameras;

    a video selection unit electrically connected to said plurality of cameras and said monitor, for connecting a selected camera from said plurality of cameras to said monitor;

    an AC line having an AC signal; and

    a synchronization unit comprising an AC line sensing device comprising a core and a coil wrapped around said core for generating a signal corresponding to the AC signal on said AC line and a synchronization circuit connected to said AC line sensing device for providing a synchronization signal to said video selection unit, wherein said AC line is wrapped around said AC line sensing device and said AC line sensing device is not electrically connected to said AC line and said video selection unit switches the video signal generated by a selected camera from said plurality of cameras to said monitor based on the occurrence of the synchronization signal.

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