Graphic symbol generator

Details Graphic symbol generator Graphic symbol generator

G - Physics

06

F

375/21

G06F 3/153 (2006.01) G09G 3/00 (2006.01)

Patent

CA 1048667

ABSTRACT Apparatus for generating graphic symbols on a cathode-ray tube em- ploys a beam control system which starts-each of a plurality of parallel strokes required for each symbol at the bottom, using a programmed offset for symbols which extend below a baseline, and to otherwise move a symbol in the X and Y axes from a position routinely specified as spaced symbols are dis- played in a line. The slope of the strokes for a symbol is controlled for italicizing the symbols by programming the relative magnitudes and signs of inputs to X and Y integrators which generate ramp signals added to symbol positioning signals. The beam is turned on and off during each stroke in response to a programmed and clocked bit stream of coded digital signals. The size of a symbol is controlled by programming the clock rate for the beam on- off control and the magnitudes of the inputs to the X and Y integrators.

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