| 摘要 |
A digitizer tablet apparatus uses edge areas on the surface of the apparatus as macro cell areas. The location of a pointing device in the apparatus is determined from a plurality of detected magnetic voltages. Threshold values are used to determine if the pointing device is in an edge area. A macro cell in an edge area may be a relative precise macro cell or a coarse macro cell. When a pointing device is in an edge area, the detected voltages may not provide enough data for determining the exact location of the pointing device. If only the exact location in X direction or Y direction can not be determined, the macro cell selected by the pointing device is a relative precise macro cell. If the exact location in both X direction and Y direction can not be determined, the macro cell is a coarse macro cell.
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