Patent ID: 7574350
Filing Date: 2009-08-11
Classification: G06K,H04L

Abstract:
1. A data carrier that is developed for contactless receiving of a signal, wherein the data carrier can be supplied with energy and information by the signal, with data carrier transmission means for transmitting the signal and with a circuit, which circuit comprises at least one connection to which the transmission means are connected and over which connection the signal can be fed to the circuit, and which circuit comprises the circuit parts listed below, namely: energy supply means, which, using the signal occurring at the data carrier transmission means, are developed to supply parts of the circuit with energy; and signal evaluation means, which, with energy input from the energy supply means, are developed to evaluate the signal occurring at the data carrier transmission means with regard to information that can be transmitted by the signal, characterized in that the signal evaluation means are developed to evaluate a self-clocking signal, which self-clocking signal forms the signal that can be fed to the circuit; characterized in that the signal is formed by a carrier signal that can be modulated in respect of a signal parameter, wherein the signal comprises a modulation-free state and at least two mutually distinguishable modulated states provided for information transmission, and wherein adjoining modulated states are separated from each other in each case by an unmodulated state, and that the signal evaluation means are developed to evaluate the at least three states.