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System for processing data signals for insertion in television signals

  • US 3,996,583 A
  • Filed: 07/30/1974
  • Issued: 12/07/1976
  • Est. Priority Date: 07/30/1973
  • Status: Expired due to Term
First Claim
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1. A signal processing system for the compilation and processing of a supply of data signals representing the data for a set of pages of data each for display, separately from the other pages, upon television receiver screens, to provide output signals for insertion in a transmitted television signal during periods of the transmitted television signal which are unoccupied by video signals, said system comprising a main store for storing the supply of data signals in digitized form, at least one peripheral data generating device for supplying data signals to the main store, a second store having a data storage capacity which is small compared with the storage capacity of the main store, transfer means operable to read out portions of the data signals in digitized form from the main store in a sequence for temporary storage of said portions in the second store, an output, discharge means operable to clock out the portions of the data from the second store and feed them to the output in series digital form at a rate and at times such that the discharged signals in said series digital form can be accommodated in said television signal during said periods, each said portion representing a part of one of said pages, said sequence being such that the supply of data signals representing the data for the set of pages is transferred to the second store in a repeated cycle, said second store and said discharge means cooperating in order that each portion is fed to the output once only per cycle and means at the output for also providing a clock run-in signal and a start code signal for accommodation in said television signal during said periods and before each said portion.

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