Patent ID: 9746962
Date: 2017-08-29
CPC Classifications: G06F

Claim:
1. A frequency selecting module for a touch system, comprising: a storage unit, for storing a sum of at least one of a plurality of sensing signals of a plurality sensing channels in the touch system; a spectrum calculating unit, for transforming the sum of the at least one of the plurality of sensing signals stored in the storage unit to generate a spectrum data and storing the spectrum data to the storage unit; and a selecting unit, for generating an adjusting signal according to the spectrum data to select one of a plurality of operation frequencies as a working frequency of the plurality of sensing signals; wherein the selecting unit calculates the sum of a plurality of amplitudes of a plurality of sampling points around each of the plurality of operation frequencies to acquire a plurality of noise levels and selects the operation frequency corresponding to the minimum noise level among the plurality of noise levels as the working frequency of the plurality of sensing signals.