SE9602147D0 - Device for electronic alarm systems - Google Patents

Device for electronic alarm systems

Info

Publication number
SE9602147D0
SE9602147D0 SE9602147A SE9602147A SE9602147D0 SE 9602147 D0 SE9602147 D0 SE 9602147D0 SE 9602147 A SE9602147 A SE 9602147A SE 9602147 A SE9602147 A SE 9602147A SE 9602147 D0 SE9602147 D0 SE 9602147D0
Authority
SE
Sweden
Prior art keywords
transmitted
frequency
transmitter
alternating field
signal
Prior art date
Application number
SE9602147A
Other languages
Swedish (sv)
Other versions
SE506610C2 (en
SE9602147L (en
Inventor
Leif Aasbrink
Original Assignee
Leif Aasbrink
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 Leif Aasbrink filed Critical Leif Aasbrink
Priority to SE9602147A priority Critical patent/SE506610C2/en
Publication of SE9602147D0 publication Critical patent/SE9602147D0/en
Priority to EP97926322A priority patent/EP0939942A1/en
Priority to JP09542189A priority patent/JP2000511310A/en
Priority to AU31111/97A priority patent/AU3111197A/en
Priority to CA002256375A priority patent/CA2256375A1/en
Priority to PCT/SE1997/000861 priority patent/WO1997045819A1/en
Publication of SE9602147L publication Critical patent/SE9602147L/en
Publication of SE506610C2 publication Critical patent/SE506610C2/en

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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2488—Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver

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)

Abstract

An arrangement pertaining to electronic alarm systems of the kind used in goods monitoring systems includes an alarm element (1) that is adapted to receive a magnetic alternating field which is transmitted from a transmitter (2) by means of a transmitter coil (3) and whose frequency is swept, wherein the alarm element is adapted to retransmit a magnetic alternating field, and wherein a receiver (4) that includes a receiver coil (5) is adapted to receive and detect the retransmitted alternating field. The invention is characterized in that the system transmitter (2) is adapted for variation of the transmitted frequency; in that the system receiver (4) is adapted to receive and detect the occurrence of a signal from a disturbing other system; in that there is provided a control circuit (8) which is adapted to analyze the frequency and phase position of a signal transmitted from a disturbing system in relation to the frequency and phase position of the alternating field transmitted from the first system; and in that the control circuit (8) is adapted to deliver to the transmitter (2) of the first-mentioned system a control signal that displaces the transmitted frequency so that the first system is not disturbed by the disturbing signal.
SE9602147A 1996-05-31 1996-05-31 Device for electronic alarm system which gives control signals to offset the transmitted frequency of the system and thus avoid interference SE506610C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9602147A SE506610C2 (en) 1996-05-31 1996-05-31 Device for electronic alarm system which gives control signals to offset the transmitted frequency of the system and thus avoid interference
EP97926322A EP0939942A1 (en) 1996-05-31 1997-05-26 An arrangement relating to electronic alarm systems that deliver control signals such as to displace the system transmission frequency and therewith avoid disturbances
JP09542189A JP2000511310A (en) 1996-05-31 1997-05-26 Apparatus related to an electronic alarm system that sends out a control signal to shift the system transmission frequency and thereby avoid interference, etc.
AU31111/97A AU3111197A (en) 1996-05-31 1997-05-26 An arrangement relating to electronic alarm systems that deliver control signals such as to displace the system transmission frequency and therewith avoid disturbances
CA002256375A CA2256375A1 (en) 1996-05-31 1997-05-26 An arrangement relating to electronic alarm systems that deliver control signals such as to displace the system transmission frequency and therewith avoid disturbances
PCT/SE1997/000861 WO1997045819A1 (en) 1996-05-31 1997-05-26 An arrangement relating to electronic alarm systems that deliver control signals such as to displace the system transmission frequency and therewith avoid disturbances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9602147A SE506610C2 (en) 1996-05-31 1996-05-31 Device for electronic alarm system which gives control signals to offset the transmitted frequency of the system and thus avoid interference

Publications (3)

Publication Number Publication Date
SE9602147D0 true SE9602147D0 (en) 1996-05-31
SE9602147L SE9602147L (en) 1997-12-01
SE506610C2 SE506610C2 (en) 1998-01-19

Family

ID=20402818

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9602147A SE506610C2 (en) 1996-05-31 1996-05-31 Device for electronic alarm system which gives control signals to offset the transmitted frequency of the system and thus avoid interference

Country Status (6)

Country Link
EP (1) EP0939942A1 (en)
JP (1) JP2000511310A (en)
AU (1) AU3111197A (en)
CA (1) CA2256375A1 (en)
SE (1) SE506610C2 (en)
WO (1) WO1997045819A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2007012435A (en) * 2005-03-07 2007-12-05 Sensormatic Electronics Corp Adaptively transmitting a signal for activating a tag.
AU2012202729B2 (en) * 2005-03-07 2015-04-09 Sensormatic Electronics Llc Adaptively transmitting a signal for activating a tag

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667185A (en) * 1985-12-06 1987-05-19 Minnesota Mining And Manufacturing Company Wireless synchronization system for electronic article surveillance system
US5371490A (en) * 1989-03-22 1994-12-06 Actron Entwicklungs Ag System for electronic safeguarding against burglary using multiple transmitters and receivers
US5023600A (en) * 1990-04-10 1991-06-11 Sensormatic Electronics Corporation Electronic article surveillance system with adaptiveness for synchronization with companion systems

Also Published As

Publication number Publication date
CA2256375A1 (en) 1997-12-04
JP2000511310A (en) 2000-08-29
AU3111197A (en) 1998-01-05
SE506610C2 (en) 1998-01-19
WO1997045819A1 (en) 1997-12-04
EP0939942A1 (en) 1999-09-08
SE9602147L (en) 1997-12-01

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