Patent ID: 7995036

Claim:
A method for noise reduction in a digitizer, the digitizer comprising a plurality of detecting elements for detecting an electromagnetic signal at one of a number of predetermined frequencies comprising: sampling at least two elements of said plurality of detecting elements substantially simultaneously to obtain an output signal from each of the at least two detecting elements; defining a noise signal based on the output signal from one element of the at least two elements, wherein one of said at least two elements is selected as a candidate carrier of stylus signal and the other of said at least two elements is selected as a candidate carrier of mere noise; and reducing noise on the output signal of the other of the at least two elements in accordance with the noise signal, wherein: said candidate carrier of mere noise is selected, noise reduction is carried out over a group of elements based on said selection being correct, a resulting signal pattern over said group of elements is analyzed, and said selection is allowed if said resulting signal pattern is indicative of a correct selection, otherwise a new selection of candidate carrier of mere noise is made.