NOISE REDUCTION IN DIGITIZER SYSTEM
First Claim
1. A digitizer controller comprising:
- a circuit configured to;
sample outputs from a plurality of sensor lines of a digitizer sensor substantially simultaneously to detect a signal emitted by a stylus interacting with the digitizer sensor;
identify based on the outputs, at least one sensor line of the plurality of sensor lines that sensed interaction with a conductive object;
determine a first level of output from the at least one sensor line in a frequency associated with emission from the stylus; and
adjust levels of the outputs from at least a portion of the plurality of sensor lines in the frequency associated with emission from the stylus based on the first level of output.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for noise reduction in a digitizer includes determining a location of a stylus with a known frequency of emission over a first sampling period, sampling output from a plurality of detecting elements over a second sampling period, identifying detecting elements with sampled output in the second sampling period above a defined threshold in a selected frequency, the selected frequency being close to but different than the known frequency of the stylus, selecting as a candidate carrier of mere noise a detecting element from the detecting elements identified that is spaced away from the determined location of the stylus, and reducing values of output sampled over the second sampling period from at least one other detecting element, in accordance with the output sampled over the second sampling period from the detecting element selected as the candidate carrier of mere noise.
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Citations
20 Claims
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1. A digitizer controller comprising:
a circuit configured to; sample outputs from a plurality of sensor lines of a digitizer sensor substantially simultaneously to detect a signal emitted by a stylus interacting with the digitizer sensor; identify based on the outputs, at least one sensor line of the plurality of sensor lines that sensed interaction with a conductive object; determine a first level of output from the at least one sensor line in a frequency associated with emission from the stylus; and adjust levels of the outputs from at least a portion of the plurality of sensor lines in the frequency associated with emission from the stylus based on the first level of output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A digitizer controller comprising:
a circuit configured to; sample outputs from a plurality of sensor lines of a digitizer sensor substantially simultaneously to detect a signal emitted by a stylus interacting with the digitizer sensor; identify based on the outputs, a first group of sensor lines of the plurality of sensor lines that sensed interaction with a conductive object; determine a first level of output from the first group in a frequency associated with emission from the stylus; adjust levels of the outputs from at least a portion of the plurality of sensor lines in the frequency associated with emission from the stylus based on the first level of output; and identify based on the adjust levels of the outputs, a second group of sensor lines that sensed interaction with a conductive object; determine a position of the stylus based on the second group. - View Dependent Claims (10, 11, 12)
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13. A digitizer system comprising:
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a display configured to display data; a digitizer sensor integrated with the display, wherein the digitizer sensor is configured to detect interaction with each of a stylus and a finger; a controller configured to operate the digitizer sensor, wherein the controller includes a circuit configured to; sample outputs from a plurality of sensor lines of a digitizer sensor substantially simultaneously to detect a signal emitted by a stylus interacting with the digitizer sensor; identify based on the outputs, at least one sensor line of the plurality of sensor lines that sensed interaction with a conductive object; determine a first level of output from the at least one sensor line in a frequency associated with emission from the stylus; and adjust levels of the outputs from at least a portion of the plurality of sensor lines in the frequency associated with emission from the stylus based on the first level of output. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification