Patent Document ID: 20110007028
Application ID: 12827592
Patent Status: 0

Claim One:
1. A method for determining a user's touch in a capacitive touch sensor system having a plurality of sensors and a relaxation oscillator, comprising: performing a series of potential touch detection tests for the plurality of sensors until a potential touch is detected, wherein each potential touch detection test involves measuring a test frequency for one of the sensors, and wherein a potential touch is detected by detecting a deviation between the measured test frequency and a previously measured test frequency for the same sensor; in response to detecting a potential touch, performing a series of baseline comparison tests for each of the sensors, wherein each baseline comparison test involves: measuring a current frequency for a particular one of the sensors; comparing the current frequency to a baseline frequency for the particular sensor; and assigning to the particular sensor a deviation value based on the comparison of its current frequency with its baseline frequency; determining whether any one of the sensors has been assigned a largest deviation value; and if one of the sensors has been assigned a largest deviation value, identifying that sensor as a touched sensor.