Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1994-11-17
1997-12-09
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
345161, G09G 500
Patent
active
056965354
ABSTRACT:
A threshold discrimination filter circuit compares an amplitude and rate of change of amplitude of an output of a graphic input device such as an isometric joystick including strain gauges and a fixed resistance in a hierarchical voltage divider with threshold reference signals and corrects the output of the graphic input device based on previously stored samples thereof when a selection or deselection action by a user is discriminated. Outputs of the graphic input device are supplied directly to a CPU of a data processing device between masking periods so that graphic manipulations such as dragging can be performed while masking unintended change of specified display location during selection and deselection.
REFERENCES:
patent: 4879556 (1989-11-01), Duimel
patent: 5012231 (1991-04-01), Felsenstein
patent: 5448261 (1995-09-01), Koike et al.
Rutledge Joseph Dela
Selker Edwin Joseph
Hjerpe Richard
International Business Machines - Corporation
Kaufman, Esq. Stephen C.
Liang Regina
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