Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Reexamination Certificate
2005-05-31
2005-05-31
Lao, Lun-Yi (Department: 2673)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
C345S165000, C345S166000, C345S167000, C250S231160
Reexamination Certificate
active
06900793
ABSTRACT:
A method and system for determining the position of a movable member in an electronic input device within a predefined resolution. Two offset signals indicate the position of the movable member. The time required for each signal to cross a threshold level is measured and inverted, revealing an offset sinusoidal relationship. The offset sinusoids may be plotted against each other to reveal an approximate circle of inverse time samples for a cycle. Corresponding inverted minimum and maximum times are used to determine a center reference value for each signal. As a function of the inverted times, a quadrant of the circle is determined. Within a quadrant, a sector most closely corresponding to the position of the movable member is determined from among a plurality of predefined sectors that define the resolution. A number of sectors between position samples of the movable member are accumulated and communicated to a host device.
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Bathiche Steven N.
Goh Chun B.
Rensberger Gary M.
Serman Nathan C.
Anderson Ronald M.
Lao Lun-Yi
Microsoft Corporation
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