Graphics decoder

Details Graphics decoder Graphics decoder

1992-06-24

1993-10-05

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

345125, 345143, G09G 128

Patent

active

052509281

ABSTRACT:
A graphics decoder which stores color number data of each pixel of the display screen, which is acquired from a subcode signal, sequentially reads out the color number data to produce a graphics RGB signal referring to a color look-up table, and supplies the graphics RGB signal to a CRT display. When a graphics command acquired from the subcode signal is a screen-scroll command, scroll data is obtained from pointer data included in that scroll command, and that scroll data is output at a timing synchronous with a horizontal sync signal or vertical sync signal to set the read address of the display memory. When the graphics command is a color look-up table write command, the color look-up table is updated at a timing synchronous with the first horizontal sync signal or vertical sync signal after the generation of that write command.

REFERENCES:
patent: 4673929 (1987-06-01), Nelson et al.
patent: 4684942 (1987-08-01), Nishi et al.
patent: 4697176 (1987-09-01), Kawakami

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