Electronic security element monitoring arrangement

摘要

The arrangement includes a transmitter per interrogation zone which transmits at least one periodic interrogation signal into the interrogation zone. The security element (2,6) is stimulated to transmit an identifying signal. A receiver receives the identification signal in more than two channels. A controller (7) evaluates the received signals and triggers an alarm if a security element is identified. The controller concentrates noise signals received in at least two channels into one channel (A) and removes the noise signal components from the remaining channels.