Registers – Transfer mechanism – Traveling pawl
Patent
1975-01-20
1976-10-05
Botz, Eugene G.
Registers
Transfer mechanism
Traveling pawl
340324AD, G06F 314
Patent
active
039846644
ABSTRACT:
A system is disclosed for generating a circle on a television raster display utilizing digital techniques. An x coordinate counter, a y coordinate counter, a radius number, and a radius +.delta. number, in parallel to each other, are connected to the input terminals of a multiplex switch. The multiplex switch selectively provides an output signal of the above number generators to a programmable read only memory (PROM). The memory in turn sequentially provides an output signal representing the square of the input number, i.e., x.sup.2, y.sup.2, r.sup.2 and (r + .delta.).sup.2. The numbers x.sup.2 and y.sup.2 are added by an adder and the number x.sup.2 + y.sup.2 is compared by a first comparator, with the number r.sup.2 and an output is provided if x.sup.2 + y.sup.2 .gtoreq. r.sup.2. The numbers x.sup.2 + y.sup.2 is also compared by a second comparator, with the number (r+.delta.).sup. 2 and an output signal is provided if x.sup.2 + y.sup.2 < (r+.delta.).sup.2. An output signal is provided to a television display whenever the above equations are true. Thus, each point on a television raster display is tested and a video signal is provided when the equations are both true.
REFERENCES:
patent: 3789200 (1974-01-01), Childress et al.
Botz Eugene G.
Cardenas Rafael A.
Hughes Aircraft Company
MacAllister William H.
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