Abstract: The invention relates to an electronic system for anti-theft protection of goods. The system comprises: a unit for detecting a metallic material in a first detection zone; a unit for detecting a magnetic or magnetizable material in a second detection zone; and a control unit. The control unit is capable of receiving information from the units for detecting metallic and magnetic material when the one or both of these units detect(s) a metallic or a magnetic material, respectively, in the respective detection zones. The control unit is further programmable to the effect that the control unit can be programmed to emit a signal which depends on whether it receives information about the detection of metallic and/or magnetic material.

Abstract: The invention relates to a method, a device and a system for preventing false alarms in a theft-preventing system comprising a magnetic field for detecting at least one metal object in a first detection zone and means for determining a time-difference; said method comprising the steps of detecting a first change in a parameter indicative of the magnetic field in said first detection zone; detecting a second change in the parameter indicative of the magnetic field in said first detection zone; determining a time-difference between the detection of said first change in said parameter and the detection of said second change in said parameter; and performing an action based on said time-difference. In this way, false alarms due to a metal detector falsely detecting for example movement of metal-doors in a first detection zone may be reduced/eliminated. Additionally, the false alarms due to an opening and/or closing of a door with metal parts acting as an active tag may be reduced/eliminated.

Abstract: The invention relates to an electronic system for anti-theft protection of goods. The system comprises: a unit for detecting a metallic material in a first detection zone; a unit for detecting a magnetic or magnetisable material in a second detection zone; and a control unit. The control unit is capable of receiving information from the units for detecting metallic and magnetic material when the one or both of these units detect(s) a metallic or a magnetic material, respectively, in the respective detection zones. The control unit is further programmable to the effect that the control unit can be programmed to emit a signal which depends on whether it receives information about the detection of metallic and/or magnetic material.