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Method for simultaneous teletext and analog signal transmission

  • US 4,413,281 A
  • Filed: 06/26/1981
  • Issued: 11/01/1983
  • Est. Priority Date: 07/01/1980
  • Status: Expired due to Term
First Claim
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1. A process for the transmission of information over television networks comprising:

  • (a) generating analog signals representing groups of scans of an image, each of said scans having a duration approximately equal to the time necessary to transmit one scan of a television image;

    (b) generating first identifying messages and combining them with the analog signals representing said scans;

    (c) generating teletext signals in digital form, said teletext signals being associated with said groups of scans;

    (d) generating second identifying messages and combining them with said teletext signals;

    (e) selecting analog signals identified by said first identifying messages and associated teletext signals identified by said second identifying messages and transmitting both approximately at the same time;

    (f) receiving said analog and teletext signals with a receiver responsive to said first and second identifying messages;

    (g) decoding said analog and associated teletext signals; and

    (h) reproducing said decoded analog and associated teletext signals for one of simultaneous or successive reproduction.

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