Patent ID: 6442215
Filing Date: 2002-08-27
Classification: G06K,H04L

Abstract:
A data carrier, which includes receiver means for receiving a carrier signal modulated in respect of a signal parameter and with a given modulation intensity, and includes an integrated circuit whichincludes connection means which are connected to the receiver means, a demodulation stage which is connected to the connection means, is arranged to demodulate the modulated carrier signal and to output a demodulated carrier signal, and has a sensitivity adapted to the given modulation intensity used for the modulated carrier signal, and includes signal processing means which succeed the demodulation stage and are arranged to process the demodulated carrier signal, characterized in that the data carrier is arranged to receive at least one additional carrier signal which is modulated in respect of the same signal parameter but with an other, given modulation intensity, the circuit including at least one additional demodulation stage which is also connected to the connection means and has an other sensitivity which is adapted to the other, given modulation intensity used for the additional modulated carrier signal, there being provided priority means which ensure that priority is granted each time to one demodulation stage only, that a demodulated carrier signal reaches the signal processing means only from this one demodulation stage and that, in the case of simultaneous demodulation of a modulated carrier signal by means of at least two demodulation stages, priority is granted each time to the demodulation stage having the each time lowest sensitivity, and that a demodulated carrier signal reaches the signal processing means only from this one demodulation stage.