Method and apparatus for reducing noise in an electrostatic digitizing tablet
AssigneeLSI Logic Corporation
InventorWilliam K. Petty
Life of this patent
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Abstract
A method for reducing the effect of a noise impulse in a digitizing panel which includes a resistive layer is disclosed. The method includes the steps of generating a signal when an object is in proximity to the digitizing panel, amplifying the signal with an amplifier, detecting the presence of the noise impulse coupled to the resistive layer, and disconnecting an input of the amplifier from the resistive layer in response to detecting the noise impulse. In addition, a digitizing panel is disclosed which includes a resistive layer for providing a signal when an object is in proximity to the digitizing panel.
Claims16
A method for reducing the effect of a noise impulse in a digitizing panel which includes a resistive layer, comprising the steps of:
- generating a signal when an object is in proximity to the digitizing panel;
- amplifying the signal with an amplifier;
- detecting the presence of the noise impulse coupled to the resistive layer;
- and
- disconnecting an input of the amplifier from the resistive layer in response to detecting the noise impulse.
A digitizing panel comprising:
- a resistive layer for providing a signal when an object is in proximity to said digitizing panel;
- an amplifier having an input connected to said resistive layer for amplifying said signal;
- a detector for detecting a noise impulse coupled to said resistive layer;
- and
- means for disconnecting said input of said amplifier from said resistive layer and connecting said input of said amplifier to a common reference source in response to detecting said noise impulse.
Dependencies are inferred from the claim text.