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System and method for encoding digital information in a television signal

  • US 5,929,920 A
  • Filed: 07/11/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 01/25/1996
  • Status: Expired due to Term
First Claim
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1. A system for communicating digital data from a transmitter to a receiver via a video signal, said video signal having a spectrum associated therewith, said system comprising:

  • means for encoding said digital data in a signal including a component at a carrier frequency selected so that said digital data is not likely to be perceptible to a viewer of said video signal, said frequency being in a portion of spectrum that contains minimal energy,means for combining the output of said encoding means with said video signal only when selected portions of said video signal occur,means for displaying the output of said combining means on a video display,means for capturing the video image displayed on said video display, andmeans responsive to said capturing means for recovering said encoded digital data.

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