Method and system for detecting a marker

Details Method and system for detecting a marker Method and system for detecting a marker

1994-02-10

1995-05-09

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 13187

Patent

active

054144108

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.

REFERENCES:
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4622542 (1986-11-01), Weaver
patent: 4710752 (1987-12-01), Cordery
patent: 5121103 (1992-06-01), Minasy et al.
patent: 5304982 (1994-04-01), Cordery

Affiliated with

Also associated with

Rating

Method and system for detecting a marker does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for detecting a marker, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for detecting a marker will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1708982