Character/vector controller for stroke written CRT displays
US4507656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Sep 13, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A controller for a vector generator used in drawing vector defined symbology on the face of a cathode ray tube is disclosed. Digital storage definitive of contiguous vectors which comprise each symbol to be drawn is addressed by a character address output from a microprocessor which also outputs rotation angle data. Rotation of each segment comprising a symbol is accomplished by simple addition of predetermined most-significant bits of the rotation angle data and segment angle data addressed from storage by the microprocessor, with the summation applied as addressing input to a ROM look-up table from which sine and cosine functions of the resultant angle are obtained. The sine and cosine functions are applied as inputs to respective integrators to establish their respective rates of integration over a period of time proportional to vector length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.