Noise reduction in digitizer system

摘要

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.

主权项

1. A method for noise reduction in a digitizer, the digitizer comprising a plurality of detecting elements spread over a sensing surface for detecting an electromagnetic signal and finger touch, the method comprising:
sampling outputs from a plurality of detecting elements substantially simultaneously to detect input originating from a stylus; identifying based on the outputs, at least one detecting element of the plurality of detecting elements that received input originating from a user touching the sensing surface; determining a first level of output from the at least one detecting element in a frequency associated with emission from the stylus; and adjusting levels of the outputs from at least a portion of the plurality of detecting elements in the frequency associated with emission from the stylus based on the first level of output.