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Data transmission in active picture period

  • US 5,075,773 A
  • Filed: 10/13/1989
  • Issued: 12/24/1991
  • Est. Priority Date: 12/07/1987
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting extended aspect ratio pictures in a video signal comprising the steps of providing a video signal in which picture information (6) occupies a smaller number of lines than the number required to fill the visible area of a conventional receiver, inserting additional data into at least some of the lines (2,4) not used for picture information, the data being at a sufficiently low level to be substantially invisible when viewed on a conventional receiver, and transmitting the picture information and data as a conventional video signal.

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