The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 1984
Filed:
Mar. 05, 1982
Karl L Chase, Glendale, AZ (US);
Sperry Corporation, New York, NY (US);
Abstract
The vector generator comprises X and Y digital-to-analog converters providing X and Y deflection voltages to a cathode ray tube display. X and Y digital accumulators provide respective inputs to the X and Y digital-to-analog converters. The word lengths of the accumulators are wider than those of the digital-to-analog converters and the digital-to-analog converters derive their inputs from the most significant digits of the accumulators. X rate and Y rate signals proportional to the sine and cosine of the vector angle are applied as inputs to the respective accumulators which accumulate the rate signals with the present contents of the accumulators so as to generate linearly changing X and Y deflection signals. The vector angle is adjusted by changing the ratio of the sine to cosine inputs to the accumulators and the vector speed is controlled by increasing and decreasing the sine and cosine signals but maintaining the ratio therebetween the same. Preferably, the accumulator is implemented by an adder and latch combination providing the least significant portion of the accumulator with an up/down counter providing the most significant portion thereof.