IMPROVED METHOD AND APPARATUS FOR DATA INPUT

摘要

A method and apparatus for providing accelerated X and Y axis position determination (12) of a probe (16) relative to a touchpad surface (10) by enabling determination of the X and Y axis coordinates independent of each other. The apparatus of the present invention enables simplification of the electronics of the touchpad (10) because fewer sense lines (60, 62) are required to achieve position resolution which is finer than the electrode pitch. Position determination (12) is further accelerated because fewer position measurements are then required to compensate for such problems as probe symmetry duplication.