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Method and apparatus for nesting secondary signals within a television signal

  • US 5,808,689 A
  • Filed: 09/05/1995
  • Issued: 09/15/1998
  • Est. Priority Date: 04/20/1994
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting secondary information within a television signal that produces successive fields, each having a first plurality of scan lines within a respective field time, the method comprising:

  • selecting a second plurality of scan lines among said first plurality of scan lines of the television signal to be encoded with control information and the secondary information;

    producing samples of the secondary information by sampling said secondary information at a predetermined rate;

    for each field, encoding an active video region of said second plurality of scan lines with the control information and a plurality of said samples, said control information indicating that said plurality of said samples are present in said second plurality of scan lines, said plurality of samples being equal in number to said samples taken within the field time, said second plurality of scan lines being encoded with said samples at a temporally compressed rate within the active video region; and

    transmitting said television signal containing said secondary information and said control information.

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