Patent ID: 6732923
Filing Date: 2004-05-11
Classification: G06K

Abstract:
A method of identifying an item comprising the steps of:transmitting a plurality of different first signals having a plurality of different frequencies; receiving second signals having second frequencies from an item label associated with the item, each second frequency corresponding to a known data bit position of an N-bit item identification number associated with the item; determining third frequencies associated with the item label which were not received from the item label, each third frequency corresponding to another known data bit position of the N-bit item identification number associated with the item; and determining the N-bit item identification number from the second and third frequencies, including the substeps of assigning first values equal to a first binary value to each known data bit position of the N-bit item identification number for the second frequencies; and assigning second values equal to a second binary value to each known data bit position of the N-bit item identification number for the third frequencies.