Importance

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Abstract

A threshold discrimination filter circuit compares signals output by 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 to values at a time of onset of selection. Onset of selection may be achieved by estimating maximum curvature of a plot of output values over time. Changes in output signals during selection and other signal signatures such as would correspond to a lift are exploited to provide a plurality of selection operations which can be recognized. User actions may be adaptively captured to increase discrimination capability (e.g. resolution) and/or user recognition. 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.

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First Claim