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US 4,148,014 AGranted
System with joystick to control velocity vector of a display cursor
AssigneeTexas Instruments Incorporated
InventorDavid C. Burson
Life of this patent
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Abstract
A joystick control, which is moveable in the X and Y directions, generates X- and Y-coded signals indicative of the co-ordinate position of the joystick. The joystick has a normally central position; movement of the joystick to a non-central position indicates the directional vector along which movement of the display cursor, such as a cursor of a video cathode-ray tube display, is to proceed. The farther the joystick is from the central position, the faster the cursor moves along the indicated directional vector.
Claims6
A video display system comprising:
- (a) at least one joystick control having a shaft member which is moveable from a central position in any direction of an X-Y plane, said joystick control including means for generating X-coordinate and Y-coordinate data signals indicative of the position of said shaft member in said X-Y plane;
- (b) processor means coupled to said joystick control for receiving said X and Y coordinate data signals, said processor means including:
- (i) means for computing the directional vector between the X-Y coordinates of the shaft member, and said central position, and
- (ii) means responsive to the relative distance of the joystick from central position as determined from said X-Y coordinate data for selecting a corresponding speed;
- and
- (c) video signal generator means coupled to said processor means, said video signal generator means being controlled by said processor means to move a cursor across the video display along the computed vector at said selected speed.
3 more elements
Dependencies are inferred from the claim text.