Method and system for detecting a marker
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United States of America Patent
Stats
-
May 9, 1995
Grant Date -
N/A
app pub date -
Feb 10, 1994
filing date -
Feb 11, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electronic article surveillance system is provided having a transmitter for generating two alternating magnetic fields by way of a single transmitter coil fed with a transmitter signal current, and a receiver that detects harmonics and intermodulation products of the alternating magnetic fields by way of a receiver coil that generates a receiver signal current. The receiver comprises a wide-bandwidth phase detector locked on to a frequency p.f.sub.2 .+-.q.f.sub.1, where p and q are positive integers, one of which may be zero, and a digital signal processor adapted to carry out a full time-domain analysis of the waveform of the receiver signal current, and wherein the transmitter signal current corresponds to the linear super position of two alternative currents with a relatively low frequency f.sub.1 and high frequency f.sub.2 respectively.
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Cited Art Landscape
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