Half normal frequency regime phase encoding in cordless digitizers
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United States of America Patent
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Dec 13, 1994
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app pub date -
Oct 25, 1993
filing date -
Oct 25, 1993
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Abstract
A device for imparting a signal phase status of an alternating current (AC) magnetic field signal transmitting from a cursor in a cordless digitizer. The device includes an apparatus for causing the cursor to temporarily emit a signal having a frequency which is lower than the frequency of a basic cursor signal, and an apparatus for determining and imparting the signal phase status of the AC magnetic field signal transmitting from the cursor as derived from the temporarily emitted lower frequency signal.
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