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Half normal frequency regime phase encoding in cordless digitizers

  • US 5,373,118 A
  • Filed: 10/25/1993
  • Issued: 12/13/1994
  • Est. Priority Date: 10/25/1993
  • Status: Expired due to Term
First Claim
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1. A device for imparting a signal phase status of a basic alternating current (AC) magnetic field signal transmitting from a cursor in a cordless digitizer having a tablet with a grid of conductors, and wherein the basic AC magnetic field signal induces a corresponding signal in the grid of conductors, the device comprising:

  • a) a means for causing the cursor to temporarily emit a signal having a frequency which is lower than the frequency of a basic cursor signal instead of the basic AC magnetic field signal; and

    ,b) a means for determining and imparting the signal phase status of the basic AC magnetic field signal transmitting from the cursor from a signal induced in the grid of conductors of the tablet by the signal transmitting from the cursor, using the temporarily emitted lower frequency signal.

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