CA1217256A - Methode et appareil de traitement de signaux pour systemes detecteurs de vol - Google Patents

Methode et appareil de traitement de signaux pour systemes detecteurs de vol

Info

Publication number
CA1217256A
CA1217256A CA000423477A CA423477A CA1217256A CA 1217256 A CA1217256 A CA 1217256A CA 000423477 A CA000423477 A CA 000423477A CA 423477 A CA423477 A CA 423477A CA 1217256 A CA1217256 A CA 1217256A
Authority
CA
Canada
Prior art keywords
marker
signal
field
signals
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000423477A
Other languages
English (en)
Inventor
Larry Eccleston
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Progressive Dynamics Inc
Original Assignee
Progressive Dynamics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/358,383 external-priority patent/US4524350A/en
Priority claimed from US06/358,299 external-priority patent/US4535323A/en
Application filed by Progressive Dynamics Inc filed Critical Progressive Dynamics Inc
Priority to CA000522288A priority Critical patent/CA1229896A/fr
Application granted granted Critical
Publication of CA1217256A publication Critical patent/CA1217256A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
CA000423477A 1982-03-15 1983-03-14 Methode et appareil de traitement de signaux pour systemes detecteurs de vol Expired CA1217256A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000522288A CA1229896A (fr) 1982-03-15 1986-11-05 Logique de detection et methode et appareil de traitement de signal pour antivol

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US358,299 1982-03-15
US06/358,383 US4524350A (en) 1982-03-15 1982-03-15 Detection logic and signal processing method and apparatus for theft detection systems
US358,383 1982-03-15
US06/358,299 US4535323A (en) 1982-03-15 1982-03-15 Preamplifying and signal processing method and apparatus for theft detection systems
US36426482A 1982-04-01 1982-04-01
US364,264 1982-04-01

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA000522288A Division CA1229896A (fr) 1982-03-15 1986-11-05 Logique de detection et methode et appareil de traitement de signal pour antivol

Publications (1)

Publication Number Publication Date
CA1217256A true CA1217256A (fr) 1987-01-27

Family

ID=27408345

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000423477A Expired CA1217256A (fr) 1982-03-15 1983-03-14 Methode et appareil de traitement de signaux pour systemes detecteurs de vol

Country Status (5)

Country Link
EP (1) EP0103629B1 (fr)
AU (1) AU562133B2 (fr)
CA (1) CA1217256A (fr)
DE (1) DE3380326D1 (fr)
WO (1) WO1983003203A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4668942A (en) * 1984-11-19 1987-05-26 Progressive Dynamics, Inc. Signal analysis apparatus including recursive filter for electromagnetic surveillance system
US4888579A (en) * 1988-09-16 1989-12-19 Minnesota Mining And Manufacturing Company False alarm minimization and direction determination methods
US5748086A (en) * 1995-11-14 1998-05-05 Sensormatic Electronics Corporation Electronic article surveillance system with comb filtering and false alarm suppression
GB9915595D0 (en) * 1999-07-02 1999-09-01 Sadler Robin W Identification apparatus for reading moving tags in passageways
CA2626228C (fr) 2005-09-20 2014-03-18 Allflex Australia Pty. Limited Antenne de portail

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR763681A (fr) * 1933-11-10 1934-05-04 Procédé de repérage des objets par modification d'un champ magnétique
US3747086A (en) * 1968-03-22 1973-07-17 Shoplifter International Inc Deactivatable ferromagnetic marker for detection of objects having marker secured thereto and method and system of using same
US3665449A (en) * 1969-07-11 1972-05-23 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US3838409A (en) * 1973-04-13 1974-09-24 Knogo Corp Field strength uniformity control system for article theft detection system
US3983552A (en) * 1975-01-14 1976-09-28 American District Telegraph Company Pilferage detection systems
US4168496A (en) * 1977-10-05 1979-09-18 Lichtblau G J Quasi-stationary noise cancellation system
US4300183A (en) * 1980-03-27 1981-11-10 Richardson Robert H Method and apparatus for generating alternating magnetic fields to produce harmonic signals from a metallic strip
US4321586A (en) * 1980-08-21 1982-03-23 Knogo Corporation Article theft detection
US4309697A (en) * 1980-10-02 1982-01-05 Sensormatic Electronics Corporation Magnetic surveillance system with odd-even harmonic and phase discrimination

Also Published As

Publication number Publication date
EP0103629A4 (fr) 1987-03-12
DE3380326D1 (en) 1989-09-07
EP0103629A1 (fr) 1984-03-28
WO1983003203A1 (fr) 1983-09-29
EP0103629B1 (fr) 1989-08-02
AU562133B2 (en) 1987-05-28
AU1471983A (en) 1983-10-24

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Legal Events

Date Code Title Description
MKEX Expiry