Cursor controller

• US 4,386,346 A
• Filed: 03/27/1981
• Issued: 05/31/1983
• Est. Priority Date: 03/27/1981
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Levine, James L.
• Primary Examiner(s): Curtis, Marshall M.
• Application Number:
  US06/248,667
• Time in Patent Office: 795 Days
• Field of Search: 340/709, 340/722, 340/721, 340/700, 340/710, 340/707, 340/723, 340/724
• US Class Current: 345/159
• CPC Class Codes: G06F 3/04892 Arrangements for controlling cursor position based on codes indicative of cursor displacements from one discrete location to another, e.g. using cursor control keys associated to different directions or using the tab key arrangements for controlling cursor position based on coordinate signals G06F3/038
• CPC Class Codes: G09G 5/08 Cursor circuits

Abstract

A controller is provided for manually actuated movement of a cursor in an interactive display wherein overshoot in the positioning of the cursor when rapid movement is involved is compensated employing a factor involving the user'"'"'s reaction time and the motion rate of the cursor.

Claims

1. In a manually controllable device of the type wherein the position of an element proceeds at a rate in response to a first operator signal and the operation is terminated in response to a subsequent second operator signal, the improvement for providing an operator reaction compensated end point comprising:

means for establishing a signal responsive to said rate;

means for establishing a signal indicative of operator reaction time;

means for producing an end point compensation adjustment signal based on the product of said operator reaction time signal and said rate signal; and

means for establishing an end point position by applying said end point compensation adjustment signal negatively to the end point at the time of said second operator signal.

2. The device of claim 1 wherein said each signal is provided from an analog circuit.

3. The device of claim 1 wherein said rate responsive signal is derived from incremental steps through a first table in the memory of a microprocessor, each entry of said first table containing a time delay between movements of said element and said operator reaction time signal is derived incremental steps through a second table, each entry of said second table being a continuously corrected user reaction time.

4. In a display terminal of the type where depression of a key by an operator controls the speed and distance of cursor travel on a display, the improvement comprising:

means for establishing a cursor motion rate;

means for establishing operator reaction time; and

means for negatively applying a backspacing signal to the cursor position for a number of spaces after release of said key determined by the expression;

##EQU5##

5. The terminal of claim 4 wherein said improvement is applied to each axis of the display.

6. The terminal of claim 5 wherein said display is a cathode ray tube.