Digital indicia generator employing compressed data
First Claim
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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Accused Products
Abstract
A display indicia generator driven by compressed data is arranged to draw indicia on a display coordinated with signals from an external environment. For drawing a line, for example, the compressed data includes coordinates of a point on the line, a slope of the line and a length of the line. The display includes a deflection system for deflecting a writing beam, such as a cathode ray beam, over the display area in a predetermined pattern, i.e., a raster scan or PPI display. The signal source for the external signals to be displayed is coupled via a mixer to the unblanking control of the display. Another input to the mixer comes from the indicia generator which is arranged to enable the beam when it reaches a point, such as the start point on the line. On each succeeding coordinate scan, counters keep track of the portion of the sweep during which the beam should be unblanked so as to display the line. At the completion of the frame, the indicia has been generated concurrently with the signals. Both raster scan and PPI scan embodiments are disclosed.
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Citations
18 Claims
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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:
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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, and first 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A compressed data indicia generator for use with a display system to manifest visible fixed indicia concurrently and in coordination with visible manifestations of information bearing signals received by an antenna in which said display system includes a writing beam scanned over a display field by a deflection system in a predetermined pattern with a beam unblanking means for creating said manifestations, the indicia generator comprising:
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a mixer for mixing information bearing signals with an output representing said indicia for controlling said beam unblanking means, storage means storing data defining said indicia including at least coordinates of one point on said indicia and a slope and length of said indicia, and first means coupled to said storage means and to said deflection system and providing indicia signals to said mixer for writing said indicia. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification