G - Physics – 06 – F
Patent
G - Physics
06
F
354/236
G06F 3/14 (2006.01) G06T 11/20 (2006.01) G09G 1/10 (2006.01)
Patent
CA 1087319
ABSTRACT OF THE DISCLOSURE The digital stroke display generates vectors by applying clock pulses to an up/down counter which through a digital-to-analog converter provides the deflection voltage for one of the display X or Y axes. The clock pulses are applied through a gate to a second up/down counter which through a second digital-to-analog converter provides the deflection voltage for the other of the X and Y axes. The gate is controlled by the overflow of an accumulator that is repetitively accumulating, under control of the clock pulses, a signal representative of the desired slope of the vector. Circular curves are generated by a concatanated series of vectors utilizing the vector generation apparatus where the signal representative of the vector slope is provided from a memory that stores the plurality of slopes for the concatanated vectors that comprise the circular curve. A signal representing the curvature of the circular curve is accumulated in a second accumulator, the output of which provides the addresses for the slope memory. Characters are generated by the vector generation apparatus in response to a sequence of stored vector control words for writing a series of vectors comprising the desired character. Apparatus for display resolution enhancement is included wherein the digital-to-analog converter utilized in the display axis associated with the gated clock derives its input from both the associated up/down counter and the output of the associated accumulator.
288454
Smart & Biggar
Sperry Corporation
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