Patent ID: 7429001
Filing Date: 2008-09-30
Classification: G06K

Abstract:
1. A label identification system comprising: a transmitting-receiving unit emitting a periodically alternating magnetic field through a primary coil; and an identification label which stores a digital identification information word on a bit basis and, fed by inductive coupling with the alternating magnetic field sent by the transmitting-receiving unit, outputs the stored identification information with a delay by corresponding modulation of the energy content of the transmission magnetic field; wherein the transmitting-receiving unit has detection means, which are connected to the primary coil and serve for detecting the energy content of the transmission magnetic field, and decoding means, which decode the identification information modulated onto the alternating magnetic field from the identification label, on the basis of a change in the energy content of the alternating magnetic field detected by the detection means and on the basis of the respectively detected time delay of this change, and from this determine the identification information as a binary code.