Boots – shoes – and leggings
Patent
1976-12-07
1978-09-19
Smith, Jerry
Boots, shoes, and leggings
340324A, 364719, 364720, G06F 314
Patent
active
041158636
ABSTRACT:
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 outut 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.
REFERENCES:
patent: 3629841 (1971-12-01), Hare
patent: 3649819 (1972-03-01), Waller
patent: 3713134 (1973-01-01), Chaney
patent: 3775760 (1973-11-01), Strathman
patent: 3789200 (1974-01-01), Childress et al.
patent: 3800183 (1974-03-01), Halio et al.
patent: 3809868 (1974-05-01), Villalobos et al.
patent: 3828169 (1974-08-01), Fluet
Cooper Albert B.
Smith Jerry
Sperry Rand Corporation
Terry Howard P.
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