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Digital indicia generator employing compressed data

  • US 4,181,956 A
  • Filed: 11/07/1977
  • Issued: 01/01/1980
  • Est. Priority Date: 11/07/1977
  • Status: Expired due to Term
First Claim
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1. In a display system for displaying signals representing an environment external thereto, said display system including a CRT display with a deflection means for sweeping a cathode ray beam over said CRT display in a predetermined pattern with means for controlling unblanking of said beam for creating visible manifestations on said CRT display, an indicia generator for providing signals to said means for controlling unblanking of said beam to write indicia on said CRT display concurrently with manifestations of said environmental signals and coordinated therewith in which said indicia generator is driven by data in compressed form comprising:

  • storage means for storing parameters related to said indicia including coordinates of a point on said indicia, a slope for said indicia and a length for said indicia, andfirst means responsive to said stored parameters and to beam position in said pattern for producing signals to control unblanking of said beam to write indicia corresponding to said stored parameters.

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