Half normal frequency regime phase encoding in cordless digitizers
First Claim
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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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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Citations
19 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A cordless digitizer including a cursor which emits a basic alternating current (AC) magnetic field signal and a tablet with a grid of conductors, and wherein the basic AC magnetic field signal induces a corresponding signal in the grid of conductors, and further comprising:
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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. - View Dependent Claims (11, 12, 13, 14)
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15. In a cordless digitizer employing a cursor which emits a basic alternating current (AC) magnetic field signal and 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, a method for imparting a signal phase status of the basic AC magnetic field signal transmitting from the cursor comprising the steps of:
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a) 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 cursor signal; and
,b) 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. - View Dependent Claims (16, 17, 18, 19)
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Specification