Apparatus for the surveillance of an electronic security element in an interrogation zone
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Nov 20, 1997
filing date -
Nov 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to an apparatus for the surveillance of an electronic security element in an interrogation zone. The essential elements are a transmitting device, a receiving device and a computing/control unit. The transmitting device emits at least one interrogation signal into the interrogation zone. This signal causes the security element to emit a characteristic signal. The receiving device receives the characteristic signal and generates a signal which is an indication of the characteristic signal. The computing/control unit evaluates the signals received from the receiving device and produces an alarm when the presence of the security element is established. The evaluation comprises detecting spikes from the signals received from the receiving device, creating a corresponding signal shape from the spikes in a self-learning process, and removing the determined spikes from the signals received from the receiving device.
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