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CODING ARRANGEMENTS FOR MULTIPLEXED MESSAGES

  • US 3,585,290 A
  • Filed: 01/29/1968
  • Issued: 06/15/1971
  • Est. Priority Date: 01/29/1968
  • Status: Expired due to Term
First Claim
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1. For use in conjunction with a television message system of the type wherein message representative line scan video signals are developed by an auxiliary video pickup device and sequentially multiplexed with regular television program video signals developed by a primary video pickup device during the vertical blanking interval thereof at a rate of one line scan signal per message information per field of program information and wherein said message information includes message category information identifying the message as to content, apparatus comprising:

  • first means responsive to said message category information for producing output signals assigning each of said line scan signals a predetermined position within said vertical blanking interval, and a predetermined category code signal identifying said line scan signal, second means responsive to said output signals from said first means for inserting a category code signal into an earlier horizontal interval of said vertical blanking interval so as to identify a plurality of message line signals inserted in later vertical blanking intervals, and third means responsive to said output signals from said first means for inserting said line scan signals having the same identifying category code frequency but different horizontal interval positions into their predetermined position within said vertical blanking interval according to a predetermined schedule, said second and third means operable to increase the message transmission capabilities of the system to a number equal to the number of unique code signals utilized, multiplied by the number of vertical blanking intervals utilized for message line insertion.

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