Patent ID: 6817536
Filing Date: 2004-11-16
Classification: G06K

Abstract:
A method of decoding an information carrier comprising a plurality of magnetic elements supported by, or incorporated in, a substrate, wherein the elements are of substantially the same width and wherein the relative positions of said magnetic elements represents the information encoded by the information carrier, the method comprising the steps of:i) applying an interrogation signal to the information carrier so that each of the magnetic elements are subjected, in turn, to the interrogation signal; ii) detecting the response signal of each of the magnetic elements to said interrogation signal; iii) processing each response signal detected in ii) so as to determine an estimate of the relative velocity between the interrogation signal and each of the magnetic elements; and iv) estimating the dynamics of motion between the interrogation signal and the information carrier, by consideration of the processed signals obtained in iii), so as to determine the relative positions of the magnetic elements.