EP0840266B1 - 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
EP0840266B1
EP0840266B1 EP97117103A EP97117103A EP0840266B1 EP 0840266 B1 EP0840266 B1 EP 0840266B1 EP 97117103 A EP97117103 A EP 97117103A EP 97117103 A EP97117103 A EP 97117103A EP 0840266 B1 EP0840266 B1 EP 0840266B1
Authority
EP
European Patent Office
Prior art keywords
computing
signals
control unit
measured values
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.)
Expired - Lifetime
Application number
EP97117103A
Other languages
German (de)
English (en)
Other versions
EP0840266A1 (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 of an electronic security element in one Interrogation zone, consisting of a transmission device, the at least one periodic interrogation signal in the interrogation zone sends out, the interrogation signal the security element stimulates to send a detection signal, one Receiving device which receives the detection signal, and a computing / control unit that the by the Received device evaluates signals and at Identification of the security element an alarm triggers.
  • EP 123 586 B suggested, in addition to two query fields with the Frequencies F1 and F2 in the kHz range a field with an im Hz range lying frequency F3 in the interrogation zone send.
  • the low frequency query field causes the fuse element in time with this field of the Saturation in one direction to saturation in the other Direction is driven.
  • the characteristic signal occurs therefore periodically with the frequency of the low frequency Field.
  • the invention has for its object a device propose the recognition of articles related to electronically detectable security elements are improved within a query zone.
  • the object is achieved in that the computing / control device the during a given period of time received signals recorded, based on the signals determines whether and if so with which period Interference signals occur and these interference signals from the received signals removed.
  • This enables the device according to the invention, in addition to periodically occurring Interference signals of known origin also occur periodically Eliminate interference signals from sources of interference with unknown interference frequencies.
  • Interference signals of known origin also occur periodically Eliminate interference signals from sources of interference with unknown interference frequencies.
  • 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 periodically determined is then from subtracted from the received signals.
  • the measurement data are fixed with a predetermined time constant, which is an integer multiple f is the duration of one cycle of the surveillance system, updated.
  • Fig. 1 shows a schematic representation of the Device 1 according to the invention for detecting a a securing element 2 provided Article 6 in one Query zone 3.
  • Query zone 3 is composed of two in essentially parallel detector gates formed, the transmitter 4 and the Receiving device 5 included. Of course you can both devices 4, 5 also in a detector gate be housed.
  • the control of the monitoring device 1 and the evaluation of the measured values takes place by means of the computing / regulating device 7.
  • FIG. 2 shows a flowchart of an advantageous program for controlling the device 1 according to the invention.
  • the program starts at point 8. Under program point 9, the transmitting device 4 and the receiving device 6 are switched 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. If, on the other hand, the received signals r are above the predetermined signal level, they are stored over a certain period of time (for example several seconds). The period taken into account is usually a multiple of the period of the interrogation signal. At program point 13, 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 are within a first k interval with the measured values of one of the subsequent k intervals are compared. hereby it can be determined whether in the considered intervals periodic signal components occur due to interference signals known or unknown origin. There different interval lengths are considered the value of n at which the difference c (n) is minimal is the period of the interference signal. This investigation leads the computing / regulating device 7 at program point 14.
  • n is the number of signals received in k Interval; k is an integer that is less than that Number of signals received divided by n; i takes the Values from 1 to n-1.
  • the received signals r over a Period of the interrogation signal saved.
  • the interference signal a (i) is at program point 18 from the periodic Received signals r (i) subtracted. This calculation must taking into account the information, how often the n measured values within a period of the cyclic Query signal occur. This is required in order to Synchronization between the received signals that the Show period of the interrogation signal, and the periodic to achieve occurring interference signals.
  • the interference signal a (i) is updated. This Update is done continuously with a Time constants that are an integer multiple f one Cycle 'of the monitor is. f controls the time constant of the signal update. To Processing of point 20 jumps the program to point 18 back and frees the received signals r (i) from the periodically occurring interference signals in which the loop, formed from the program points 18, 19 20, go through becomes.

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  • 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)

Claims (7)

  1. Appareil (1) pour surveiller un élément de sécurité électronique (2) dans une zone d'interrogation (3), constitué d'un dispositif d'émission (4), qui émet au moins un signal d'interrogation périodique dans la zone d'interrogation (3), le signal d'interrogation excitant l'élément de sécurité pour qu'il émette un signal de reconnaissance, d'un dispositif de réception (5), qui reçoit le signal de reconnaissance, et une unité de régulation/calcul (7), qui évalue les signaux (r(i)) reçus par l'installation de réception et déclenche une alarme lors de l'identification de l'élément de sécurité, caractérisé en ce que, le dispositif de régulation/calcul (7) enregistre les signaux (r(i)) reçus pendant un intervalle de temps (tp) prédéterminé, en ce qu'il détermine à l'aide des signaux reçus (r), si des signaux parasites (a(i)) apparaissent dans les signaux reçus (r(i)) et, éventuellement avec quelle période, et en ce qu'il élimine les signaux parasites déterminés (a(i)) des signaux reçus (r(i)).
  2. Appareil selon la revendication 1, caractérisé en ce que pendant l'intervalle de temps prédéterminé tp, le dispositif de régulation/calcul (7) enregistre au moins k*n valeurs de mesure, où n = 1, 2, 3, ...z et k est un nombre entier qui est inférieur au nombre de signaux (r) reçus, divisé par n, et détermine à l'aide d'une comparaison des n valeurs de mesure d'un premier intervalle k avec les n valeurs de mesure des k intervalles suivants, si des signaux parasites périodiques (a(i)) apparaissent pendant l'intervalle de temps comprenant les n valeurs de mesure.
  3. Appareil selon la revendication 2, caractérisé en ce que le dispositif de régulation/calcul (7) détermine les différences c(n) pour différents nombres de n valeurs de mesure dans k intervalles selon la formule suivante : c(n) = Σ|r(n • k...n • (k+1)-1) - r(n • (k+1)...n • (k+2)-1)|
  4. Appareil selon la revendication 2 ou 3, caractérisé en ce que le dispositif de régulation/calcul (7) détermine le signal parasite périodique à l'aide de la plus petite différence cmin(n) obtenue, lorsque la différence cmin(n) est inférieure à une valeur maximale prédéterminée Cmax(n).
  5. Appareil selon la revendication 4, caractérisé en ce que le dispositif de régulation/calcul (7) détermine un signal parasite a(i) initial moyenné sur l'intervalle de n valeurs de mesure selon la formule suivante : a(i) = Σ r(n *(k+i)), avec i = 1, 2,..., n-1
  6. Appareil selon la revendication 5, caractérisé en ce que le dispositif de régulation/calcul (7) soustrait le signal parasite (a(i)) moyenné apparaissant périodiquement, des signaux reçus (r(i)).
  7. Appareil selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de régulation/calcul (7) actualise la détermination des signaux parasites (a (i)) avec une constante de temps fixe prédéterminée.
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 EP0840266A1 (fr) 1998-05-06
EP0840266B1 true 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

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168496A (en) * 1977-10-05 1979-09-18 Lichtblau G J Quasi-stationary noise cancellation system
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
US4975681A (en) * 1989-12-07 1990-12-04 Sensormatic Electronics Corporation Interfering signal rejection circuitry and electronic article surveillance system and method employing same
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
US5495229A (en) * 1994-09-28 1996-02-27 Sensormatic Electronics Corporation Pulsed electronic article surveillance device employing expert system techniques for dynamic optimization
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

Also Published As

Publication number Publication date
US5894270A (en) 1999-04-13
DE59706000D1 (de) 2002-02-21
EP0840266A1 (fr) 1998-05-06
ES2171800T3 (es) 2002-09-16
DE19644927A1 (de) 1998-04-30

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