EP0449173B1 - Anordnung zur Meldung der unbefugten Mitnahme von ortsbeweglichen Gegenständen - Google Patents

Anordnung zur Meldung der unbefugten Mitnahme von ortsbeweglichen Gegenständen Download PDF

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Publication number
EP0449173B1
EP0449173B1 EP91104662A EP91104662A EP0449173B1 EP 0449173 B1 EP0449173 B1 EP 0449173B1 EP 91104662 A EP91104662 A EP 91104662A EP 91104662 A EP91104662 A EP 91104662A EP 0449173 B1 EP0449173 B1 EP 0449173B1
Authority
EP
European Patent Office
Prior art keywords
frequency
supply voltage
resonant circuit
voltage source
electronic switch
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
EP91104662A
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German (de)
English (en)
French (fr)
Other versions
EP0449173A3 (en
EP0449173A2 (de
Inventor
Helmut Brähler
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0449173A2 publication Critical patent/EP0449173A2/de
Publication of EP0449173A3 publication Critical patent/EP0449173A3/de
Application granted granted Critical
Publication of EP0449173B1 publication Critical patent/EP0449173B1/de
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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
    • G08B13/2405—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
    • G08B13/2414—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 inductive tags
    • 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
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details

Definitions

  • the invention relates to an arrangement for reporting the unauthorized transportation of portable objects, in particular conference receivers, from a room in which the objects are to remain permanently, according to the preamble of claim 1.
  • the electronic switch which is closed by the received signal of the resonance circuit in the event of resonance, is directly the one via which the beep tone generator is connected to the supply voltage source.
  • the electronic switch is equipped with a self-holding function, by means of which the beep tone generator remains switched on, even if the received signal drops again. Since the electronic switch switches the beep generator directly, it requires a relatively high control energy, which must be supplied by the received electromagnetic wave. This results in a relatively low sensitivity. Conversely, the electronic switch can also easily are brought into the switched-on state by non-system electromagnetic waves whose frequency happens to be in the resonance range.
  • DE 37 33 808 A1 Another arrangement for monitoring objects and / or persons is known from DE 37 33 808 A1, which also works with a transmitter and a receiving circuit on each person or object to be monitored.
  • the receiving circuit is in constant or quasi-continuous operation.
  • the RF signal emitted by the transmitter is coded in a certain way, and each receiving circuit contains a digital decoder which emits an alarm signal when a defined information content of the coded RF signal is present.
  • This coding and decoding can be used to effectively eliminate interference from non-system waves, but the circuitry required is very high, especially on the receiving circuit side. This stands in the way of using this known arrangement when it comes to securing relatively inexpensive items that can be manufactured in large quantities, such as conference receivers.
  • the invention has for its object to design the arrangement of the type mentioned in such a way that reliable discrimination of non-system electromagnetic waves is ensured at the same time with low structural complexity and at the same time high sensitivity of the receiving device in the objects to be secured to the electromagnetic wave emitted for protection.
  • the two-stage activation of the beep tone generator namely via the electronic switch controlled by the received resonance signal and the electronic latching switch controlled by the phase comparison circuit, achieves a high sensitivity and also the advantage that the receiving device does not normally require any current in the object to be protected, also not for a stand-by function, so it behaves like a passive device. It is only switched on by the long-wave field, which is by means of only the energy for actuating the first electronic switch is taken from the resonance circuit, preferably a parallel resonance circuit, this preferably being implemented by a field-effect transistor.
  • a further increase in the reliability of the arrangement is achieved by the development according to claim 2, in which a timing element between the phase comparison circuit and the electronic latching switch delays the response of the latching switch by a defined period of time.
  • the alarm by means of the beep tone generator is only triggered if the triggering conditions on the phase comparison circuit exist for a certain minimum duration.
  • a high-frequency transmitter module can be provided in each object to be protected, which is switched on in the event of a message and emits a high-frequency signal that is generated by means of a suitably positioned high-frequency receiver can be received and evaluated at a remote location.
  • the invention is particularly suitable for securing conference receivers, which are designed for this purpose according to claim 3.
  • the conference receiver according to the features of claim 3 is operated particularly advantageously according to the method according to claim 4.
  • Fig. 1 shows a long-wave transmitter 1 of an arrangement for reporting the unauthorized taking of portable objects.
  • the transmitting device 1 is arranged at each exit of a room in which the objects to be protected, for example conference receivers, are located.
  • the transmitting device 1 contains an oscillator circuit 3 with an oscillator and a two-stage frequency divider, at whose terminal 3 'a high frequency (HF) and at its terminal 3''a low frequency (NF) is tapped and fed to a transmitter 2.
  • the transmitter 2 which amplifies the high frequency, contains an amplitude modulator, which modulates the high frequency from the terminal 3 'with the fixed low frequency derived from the high frequency by even division from the terminal 3''.
  • the amplitude-modulated signal is then fed to an antenna 5, which then emits it as an electromagnetic long wave.
  • the antenna 5 can consist, for example, of a ferrite rod or an earth loop and expediently contains a harmonic filter.
  • the oscillator frequency is given as an example at 2.09715 MHz, the HF at 131.07 kHz and the NF (modulation frequency) at 1/32 of the HF, which corresponds to approximately 4.1 kHz.
  • Fig. 2 shows the circuit diagram of the receiving device 4, which is integrated in the object to be protected (for example a conference receiver). It contains a parallel resonance circuit 6, which is set up for receiving the transmission frequency emitted by the transmission device 1 in the long-wave range and is matched to the transmission frequency (in the example, 131.07 kHz).
  • the resonance circuit 6 is connected via a diode 7 to the actuator G or gate of an electronic switch, which is closed by the voltage generated at the resonance circuit 6 when resonating.
  • the switch 8 connects the supply voltage source 12 connected to its clamp S (source) to a high-frequency amplifier 10, which is connected to the terminal D (drain) of the switch 8.
  • the electronic switch 8 can advantageously consist of a field effect transistor (FET).
  • the supply voltage source 12 can be implemented by a battery or an accumulator, which also supplies the receiving part 24 of the conference receiver, which for example operates in the infrared range, with voltage.
  • the RF signal emitted by the resonance circuit 6 in the event of a resonance is supplied to the RF amplifier 10 activated by closing the switch 8.
  • the RF amplifier 10 is indirectly followed by a phase comparison circuit 18, which has one input via a frequency divider 19 and the other input via an amplitude demodulator 20 is connected to the output of the high-frequency amplifier 10.
  • the phase comparison circuit can be designed, for example, as a phase-locked loop (PLL) circuit or as an exclusive OR gate.
  • the amplitude demodulator 20 demodulates the HF picked up by the HF amplifier in a known manner and outputs the corresponding LF signal to the phase comparison circuit 18.
  • the divider 19 also divides the HF of the HF amplifier 10 down to a low frequency, with the same divider ratio that is used in the oscillator circuit 3 for the derivation of the NF from the HF, that is 1/32 in the example.
  • All of the transmitting devices 1 used to secure a room at the outputs are constructed identically and work with the same transmitting frequency. They generate a corresponding long-wave field in the immediate vicinity of the respective output. If a conference receiver enters this long-wave field, two signals of the same frequency and phase are generated at the two inputs of the phase comparison circuit of approximately 4.1 kHz in the example, whereupon an intermittent signal generator in the form of the phase comparison circuit 18 via an intermediate timer 22 and a latching switch 14 a beep generator 16 is connected to the supply voltage source 12. During this process, the timer 22 delays the response of the electronic latching switch 14 by a defined period of time, for example 0.5 seconds, in order to suppress triggering conditions that are only given for a short time.
  • the electronic latching switch 14 is preferably closed by the amplified received signal at the output of the amplifier.
  • the alarm is triggered when the received longitudinal wave has the resonance frequency of the resonance circuit 6 and is amplitude-modulated in the special manner described.
  • Other long waves with a different frequency or different or no modulation either does not lead to the response of the electronic switch 8 or does not result in two signals of the same frequency and phase at the input of the phase comparison circuit 18, with the result that the latching switch 14 is not activated.
  • the beep tone generator 16 can be connected in parallel with a small RF transmitter module, the RF radiation of which is received at the transmitter device 1 and processed to form a special signal which can be forwarded to a remote location.

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  • 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)
EP91104662A 1990-03-30 1991-03-25 Anordnung zur Meldung der unbefugten Mitnahme von ortsbeweglichen Gegenständen Expired - Lifetime EP0449173B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4010327 1990-03-30
DE4010327A DE4010327C1 (enrdf_load_stackoverflow) 1990-03-30 1990-03-30

Publications (3)

Publication Number Publication Date
EP0449173A2 EP0449173A2 (de) 1991-10-02
EP0449173A3 EP0449173A3 (en) 1992-12-02
EP0449173B1 true EP0449173B1 (de) 1997-07-30

Family

ID=6403448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104662A Expired - Lifetime EP0449173B1 (de) 1990-03-30 1991-03-25 Anordnung zur Meldung der unbefugten Mitnahme von ortsbeweglichen Gegenständen

Country Status (2)

Country Link
EP (1) EP0449173B1 (enrdf_load_stackoverflow)
DE (2) DE4010327C1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239271A1 (de) * 1991-11-21 1993-10-14 Thomson Brandt Gmbh Diebstahlabsicherung mit Sende-Empfangs-Prinzip
DE4242739A1 (de) * 1992-12-17 1994-06-23 Thomson Brandt Gmbh Rundfunkempfänger
DE19745953C2 (de) * 1997-10-17 2002-12-05 Anatoli Stobbe Diebstahl-Sicherungssystem sowie Verfahren zur automatischen Detektion und Identifikation eines Warensicherungsetiketts durch eine Basisstation
KR100634296B1 (ko) * 1998-11-24 2006-10-16 가부시키가이샤 코진 자명식 물품감시장치
US8452868B2 (en) 2009-09-21 2013-05-28 Checkpoint Systems, Inc. Retail product tracking system, method, and apparatus
US8508367B2 (en) 2009-09-21 2013-08-13 Checkpoint Systems, Inc. Configurable monitoring device
CN103250191B (zh) 2009-09-28 2016-10-19 关卡系统公司 用于触发警报的系统、方法以及装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH472748A (de) * 1968-04-09 1969-05-15 Theytaz Philibert Einrichtung zur drahtlosen Identifizierung von Objekten beim Passieren einer räumlichen Schranke
GB2181326B (en) * 1985-09-30 1989-09-20 Sensormatic Electronics Corp Electronic surveillance using self-powered article attached tags
DE3733808A1 (de) * 1987-10-07 1989-05-11 T E C Computer Gmbh Vorrichtung zur ueberwachung von sachen und/oder personen
US4992776A (en) * 1988-04-08 1991-02-12 Crossfield Michael D Antipilferage tags and their use

Also Published As

Publication number Publication date
DE4010327C1 (enrdf_load_stackoverflow) 1991-12-19
EP0449173A3 (en) 1992-12-02
DE59108802D1 (de) 1997-09-04
EP0449173A2 (de) 1991-10-02

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