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:
Aug. 03, 1993
Filed:
Jun. 22, 1989
Ted W Berwin, Playa del Rey, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A symbol/raster generator system for a CRT display system is described, having the capability of generating raster-scanned display signals or vector symbology. The system includes a polar coordinate transformation circuit which transforms polar coordinate beam deflection data into corresponding X and Y beam deflection control signals. The system includes an angle accumulator for accumulating incremental angular data over time, and sine and cosine PROMS for providing the sine and cosine of the accumulated angle value. X and Y multiplier circuits provide respective incremental dX and dY values corresponding to the respective products of the cosine and sine values with a step size value dR. The incremental dX and dY values are accumulated over time to provide the X and Y beam deflection signals. The system further includes circuits for providing the angle data and step size dR so as to generate rasters, 8 and 16-side characters, curved and slanted characters, conic symbology, and other types of special symbols. The rasters can be arc-scanned rasters as required in radar displays, e.g., plan position indicator (PPI), SAR, angular and radial scan. The system provides an integrated and highly versatile raster/symbol generator for CRT displays.