US2011254807A1PendingUtilityA1

Noise reduction in digitizer system

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Assignee: N trig ltdPriority: Feb 27, 2004Filed: Jun 29, 2011Published: Oct 20, 2011
Est. expiryFeb 27, 2024(expired)· nominal 20-yr term from priority
Inventors:Haim PerskiOri Rimon
G06F 3/0441G06F 3/04182G06F 3/0442G06F 3/04162G06F 2203/04106G06F 3/0412G06F 3/03545G06F 3/046G06F 2203/04108
52
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Claims

Abstract

A digitizer that includes plurality of detecting elements for detecting an electromagnetic signal. A method for noise reduction in the digitizer includes determining a location of a stylus with a known frequency of emission over a first sampling period, sampling output from the plurality of detecting elements substantially simultaneously over a second sampling period, the second sampling period subsequent to the first sampling period, identifying detecting elements with output above a defined threshold in a selected frequency that is close to but different than the known frequency, wherein the detecting elements identified are identified based on the output sampled over the second sampling period, selecting from the detecting elements identified in the second sampling period, a detecting element that is spaced away from the location of the stylus, wherein the detecting element selected is selected as a candidate carrier of mere noise, and reducing output sampled in the second sampling period of at least one other detecting element in accordance with output of the detecting element selected as a candidate carrier of mere noise.

Claims

exact text as granted — not AI-modified
1 . A method for noise reduction in a digitizer, the digitizer comprising a plurality of detecting elements for detecting an electromagnetic signal, comprising:
 determining a location of a stylus with a known frequency of emission over a first sampling period;   sampling output from the plurality of detecting elements substantially simultaneously over a second sampling period, the second sampling period subsequent to the first sampling period;   identifying detecting elements with output above a defined threshold in a selected frequency that is close to but different than the known frequency, wherein the detecting elements identified are identified based on the output sampled over the second sampling period;   selecting from the detecting elements identified in the second sampling period, a detecting element that is spaced away from the location of the stylus, wherein the detecting element selected is selected as a candidate carrier of mere noise; and   reducing values of output sampled in the second sampling period of at least one other detecting element, in accordance with output of the detecting element selected as a candidate carrier of mere noise.   
     
     
         2 . The method of  claim 1 , comprising locating the stylus in a second sampling period based on a signal level of the reduced value of output of the at least one other detecting element. 
     
     
         3 . The method of  claim 1 , comprising detecting from each of the plurality of detecting element, output in the selected frequency and output in the known frequency. 
     
     
         4 . The method of  claim 1 , comprising utilizing signal level of output in the selected frequency to estimate a noise level in the known frequency of the stylus. 
     
     
         5 . The method of  claim 1 , wherein output of candidate carrier of mere noise is at least in part a consequence of presence of any member of a group of: a finger, hand or palm. 
     
     
         6 . The method of  claim 1 , wherein said digitizer is adapted for finger touch detection and wherein the selected frequency is a frequency used for said finger touch detection. 
     
     
         7 . The method of  claim 1 , wherein the detecting element that is spaced away from the location of the stylus is spaced away from the location of the stylus by a distance that is above a predefined distance. 
     
     
         8 . The method of  claim 1 , wherein the detecting element selected from the detecting elements identified is a detecting element that is furthest from the location of the stylus. 
     
     
         9 . The method of  claim 1 , wherein the selected frequency is a frequency within a defined range of frequencies around the known frequency of the stylus. 
     
     
         10 . The method of  claim 9 , wherein the selected frequency is a frequency having a highest level output in the defined range. 
     
     
         11 . The method of  claim 1  further comprising:
 detecting output in each of a plurality of frequencies within a defined range of frequencies around the known frequency of the stylus; and 
 defining the selected frequency as a frequency with a highest output from the output in each of the plurality of frequencies.

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