EP0840266A1 - Dispositif pour surveiller un élément de sécurité dans une zone d'interrogation - Google Patents

Dispositif pour surveiller un élément de sécurité dans une zone d'interrogation Download PDF

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Publication number
EP0840266A1
EP0840266A1 EP97117103A EP97117103A EP0840266A1 EP 0840266 A1 EP0840266 A1 EP 0840266A1 EP 97117103 A EP97117103 A EP 97117103A EP 97117103 A EP97117103 A EP 97117103A EP 0840266 A1 EP0840266 A1 EP 0840266A1
Authority
EP
European Patent Office
Prior art keywords
signals
computing
measured values
received
signal
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.)
Granted
Application number
EP97117103A
Other languages
German (de)
English (en)
Other versions
EP0840266B1 (fr
Inventor
David Stocks
Terry Clancy
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.)
Meto International GmbH
Original Assignee
Meto International GmbH
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
Application filed by Meto International GmbH filed Critical Meto International GmbH
Publication of EP0840266A1 publication Critical patent/EP0840266A1/fr
Application granted granted Critical
Publication of EP0840266B1 publication Critical patent/EP0840266B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2482—EAS methods, e.g. description of flow chart of the detection procedure
    • 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout

Definitions

  • the invention relates to a device for monitoring an electronic security element in an interrogation zone, consisting of a transmission device that emits at least one periodic interrogation signal into the interrogation zone, the interrogation signal stimulating the security element to emit a detection signal, a receiving device that receives the detection signal, and one Computing / control unit that evaluates the signals received by the receiving device and triggers an alarm when the security element is identified.
  • EP 123 586 B proposes to send a field with a frequency F3 in the Hz range to the query zone in addition to two query fields with the frequencies F1 and F2 in the kHz range.
  • the low-frequency interrogation field causes the fuse element to cycle from saturation in one direction to saturation in the other in time with this field Direction is driven.
  • the characteristic signal therefore occurs periodically with the frequency of the low-frequency field.
  • the invention is based on the object of proposing a device which improves the recognition of articles which are equipped with electronically detectable security elements within a query zone.
  • the object is achieved in that the computing / control device records the signals received during a predetermined period of time, uses the signals to determine whether and if so with what period interference signals occur and removes these interference signals from the received signals.
  • the device according to the invention thus makes it possible, in addition to periodically occurring ones Eliminate interfering signals of known origin, also periodically occurring interfering signals that originate from interference sources with unknown interference frequencies.
  • One example is the control of the energy supply for cash registers in supermarkets.
  • the computing / control device determines the periodic interference signal on the basis of the smallest resulting difference c (n) if the difference c (n) is smaller than a predetermined maximum value c max , which is a fraction represents the average interference signal.
  • the interfering signal thus determined periodically is then subtracted from the received signals.
  • the measurement data are updated with a fixed predetermined time constant, which is an integral multiple f of the duration of a cycle of the monitoring system .
  • the interrogation zone 3 is formed by two essentially parallel detector gates which contain the transmitting device 4 and the receiving device 5. Of course, both devices 4, 5 can also be accommodated in a detector gate.
  • the monitoring device 1 is controlled and the measured values are evaluated by means of the computing / regulating device 7.
  • FIG. 2 shows a flow diagram of an advantageous program for controlling the device 1 according to the invention.
  • the program starts at point 8. Under program point 9, the transmitter 4 and the Receiving device 6 turned on. If the received signals r are below a predetermined signal level - the corresponding check is carried out at program point 11 - the program jumps to program point 17. On the other hand, if the received signals r are above the predetermined signal level, they are transmitted over a certain period of time (e.g. several seconds) saved. The period taken into account is usually a multiple of the period of the interrogation signal.
  • the stored received signals r are divided at least approximately into k intervals of n measurement data each. So k is an integer that is less than or equal to the number of stored received signals r divided by n.
  • c (n) ⁇
  • n measured values within a first k interval are compared with the measured values of one of the subsequent k intervals. This makes it possible to determine whether periodic signal components occur in the intervals under consideration, which can be attributed to interference signals of known or unknown origin. Since different interval lengths are considered, the value of n for which the difference c (n) is minimal provides the period of the interference signal.
  • the computer 7 carries out this examination at program point 14.
  • n is the number of signals received in a k interval; k is an integer less than the number of signals received divided by n; i takes the values from 1 to n-1.
  • the received signals r are stored over a period of the interrogation signal.
  • the interference signal a (i) is subtracted from the periodic reception signals r (i). This calculation must take into account the information of how often the n measured values occur within a period of the cyclical query signal. This is necessary in order to achieve synchronization between the received signals, which show the period of the interrogation signal, and the periodically occurring interference signals.
  • the interference signal a (i) is updated. This update takes place continuously with a time constant which is an integer multiple f of a cycle of the monitoring device. f thus controls the time constant of the signal update.
  • the program jumps back to point 18 and frees the received signals r (i) from the periodically occurring interference signals, in which the loop, formed from program points 18, 19 20, is run through.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP97117103A 1996-10-29 1997-10-02 Dispositif pour surveiller un élément de sécurité dans une zone d'interrogation Expired - Lifetime EP0840266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19644927A DE19644927A1 (de) 1996-10-29 1996-10-29 Vorrichtung zur Überwachung eines elektronischen Sicherungselementes in einer Abfragezone
DE19644927 1996-10-29

Publications (2)

Publication Number Publication Date
EP0840266A1 true EP0840266A1 (fr) 1998-05-06
EP0840266B1 EP0840266B1 (fr) 2002-01-16

Family

ID=7810307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117103A Expired - Lifetime EP0840266B1 (fr) 1996-10-29 1997-10-02 Dispositif pour surveiller un élément de sécurité dans une zone d'interrogation

Country Status (4)

Country Link
US (1) US5894270A (fr)
EP (1) EP0840266B1 (fr)
DE (2) DE19644927A1 (fr)
ES (1) ES2171800T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6750768B2 (en) * 2002-04-15 2004-06-15 Wg Security Products, Inc. EAS system employing pseudorandom coding system and method
US6753821B2 (en) * 2002-04-22 2004-06-22 Wg Security Products, Inc. Method and arrangement of antenna system of EAS
US8131239B1 (en) 2006-08-21 2012-03-06 Vadum, Inc. Method and apparatus for remote detection of radio-frequency devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005518A (en) * 1977-10-05 1979-04-19 Lichtblau G J Quasistationary noise cancellation system
US4975681A (en) * 1989-12-07 1990-12-04 Sensormatic Electronics Corporation Interfering signal rejection circuitry and electronic article surveillance system and method employing same
US5495229A (en) * 1994-09-28 1996-02-27 Sensormatic Electronics Corporation Pulsed electronic article surveillance device employing expert system techniques for dynamic optimization

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459474A (en) * 1981-05-18 1984-07-10 Walton Charles A Identification system with separation and direction capability and improved noise rejection
US4668942A (en) * 1984-11-19 1987-05-26 Progressive Dynamics, Inc. Signal analysis apparatus including recursive filter for electromagnetic surveillance system
US4630035A (en) * 1985-01-04 1986-12-16 Motorola, Inc. Alarm system having alarm transmitter indentification codes and acoustic ranging
US4679035A (en) * 1985-07-30 1987-07-07 Sensormatic Electronics Corporation Tri-signal electromagnetic article surveillance system
US5023598A (en) * 1990-01-02 1991-06-11 Pitney Bowes Inc. Digital signal processor for electronic article gates
GB9009739D0 (en) * 1990-05-01 1990-06-20 Disys Inc Transponder system
US5300922A (en) * 1990-05-29 1994-04-05 Sensormatic Electronics Corporation Swept frequency electronic article surveillance system having enhanced facility for tag signal detection
SE9203479L (sv) * 1992-01-20 1993-07-21 Rso Corp Saett och anordning vid elektronisk identifiering
US5349339A (en) * 1992-04-07 1994-09-20 Actron Entwicklungs Ag Apparatus for the detection of labels employing subtraction of background signals
US5673024A (en) * 1996-04-22 1997-09-30 Sensormatic Electronics Corporation Electronic article surveillance system with comb filtering by polyphase decomposition and nonlinear filtering of subsequences
US5699045A (en) * 1996-06-06 1997-12-16 Sensormatic Electronics Corporation Electronic article surveillance system with cancellation of interference signals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2005518A (en) * 1977-10-05 1979-04-19 Lichtblau G J Quasistationary noise cancellation system
US4975681A (en) * 1989-12-07 1990-12-04 Sensormatic Electronics Corporation Interfering signal rejection circuitry and electronic article surveillance system and method employing same
US5495229A (en) * 1994-09-28 1996-02-27 Sensormatic Electronics Corporation Pulsed electronic article surveillance device employing expert system techniques for dynamic optimization

Also Published As

Publication number Publication date
US5894270A (en) 1999-04-13
DE59706000D1 (de) 2002-02-21
ES2171800T3 (es) 2002-09-16
EP0840266B1 (fr) 2002-01-16
DE19644927A1 (de) 1998-04-30

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