Character/vector controller for stroke written CRT displays

Details Character/vector controller for stroke written CRT displays Character/vector controller for stroke written CRT displays

1982-09-13

1985-03-26

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340727, 340736, G09G 110

Patent

active

045076561

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.

REFERENCES:
patent: 3821729 (1974-06-01), Schultze
patent: 3824382 (1974-07-01), Eshelman
patent: 3921163 (1975-11-01), Giraud et al.
patent: 3962536 (1976-06-01), Busch
patent: 4001806 (1977-01-01), Sweeting
patent: 4032768 (1977-06-01), Rieger
patent: 4095145 (1978-06-01), Terranova et al.
patent: 4228510 (1980-10-01), Johnson et al.

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