DE2438218C2 - Elektronisches Sicherheitssystem mit einer Störsignalblockierschaltung - Google Patents

Elektronisches Sicherheitssystem mit einer Störsignalblockierschaltung

Info

Publication number
DE2438218C2
DE2438218C2 DE2438218A DE2438218A DE2438218C2 DE 2438218 C2 DE2438218 C2 DE 2438218C2 DE 2438218 A DE2438218 A DE 2438218A DE 2438218 A DE2438218 A DE 2438218A DE 2438218 C2 DE2438218 C2 DE 2438218C2
Authority
DE
Germany
Prior art keywords
circuit
integrator
multivibrator
signal
pulse
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
DE2438218A
Other languages
German (de)
English (en)
Other versions
DE2438218A1 (de
Inventor
George Jay New York N.Y. Lichtblau
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
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of DE2438218A1 publication Critical patent/DE2438218A1/de
Application granted granted Critical
Publication of DE2438218C2 publication Critical patent/DE2438218C2/de
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
    • G08B13/2414—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
    • G08B13/2465—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

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)
  • Geophysics And Detection Of Objects (AREA)
  • Credit Cards Or The Like (AREA)
DE2438218A 1973-08-20 1974-08-08 Elektronisches Sicherheitssystem mit einer Störsignalblockierschaltung Expired DE2438218C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00389728A US3828337A (en) 1973-08-20 1973-08-20 Noise rejection circuitry

Publications (2)

Publication Number Publication Date
DE2438218A1 DE2438218A1 (de) 1975-02-27
DE2438218C2 true DE2438218C2 (de) 1985-08-14

Family

ID=23539479

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2438218A Expired DE2438218C2 (de) 1973-08-20 1974-08-08 Elektronisches Sicherheitssystem mit einer Störsignalblockierschaltung

Country Status (9)

Country Link
US (1) US3828337A (enrdf_load_stackoverflow)
JP (1) JPS533913B2 (enrdf_load_stackoverflow)
BR (1) BR7406375D0 (enrdf_load_stackoverflow)
CA (1) CA1033027A (enrdf_load_stackoverflow)
DE (1) DE2438218C2 (enrdf_load_stackoverflow)
FR (1) FR2241837B1 (enrdf_load_stackoverflow)
GB (1) GB1484353A (enrdf_load_stackoverflow)
IT (1) IT1011583B (enrdf_load_stackoverflow)
ZA (1) ZA744889B (enrdf_load_stackoverflow)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223830A (en) * 1978-08-18 1980-09-23 Walton Charles A Identification system
US4278900A (en) 1979-02-15 1981-07-14 Westinghouse Electric Corp. Fail-safe pulse providing apparatus
US4236068A (en) * 1979-03-29 1980-11-25 Walton Charles A Personal identification and signaling system
JPS57124548A (en) * 1981-01-26 1982-08-03 Nippon Koki Kk Casting method
US4429302A (en) * 1981-10-08 1984-01-31 I. D. Engineering, Inc. Electronic security system with noise rejection
US4476459A (en) * 1981-10-23 1984-10-09 Knogo Corporation Theft detection method and apparatus in which the decay of a resonant circuit is detected
US4728938A (en) * 1986-01-10 1988-03-01 Checkpoint Systems, Inc. Security tag deactivation system
US4779077A (en) * 1987-04-13 1988-10-18 Lichtblau G J Continuously armed high reliability pulse train processor
WO1989012877A1 (en) * 1988-06-20 1989-12-28 Lichtblau G J Continuously armed high reliability pulse train processor
WO1991006934A1 (en) 1989-10-31 1991-05-16 Checkpoint Systems, Inc. Method for tagging articles used in conjunction with an electronic article surveillance system, and tags or labels useful in connection therewith
US5081445A (en) * 1991-03-22 1992-01-14 Checkpoint Systems, Inc. Method for tagging articles used in conjunction with an electronic article surveillance system, and tags or labels useful in connection therewith
GB2282720A (en) * 1993-09-10 1995-04-12 Thomson Consumer Electronics Circuit for synchronizing a microprocessor in a TV receiver
US5508684A (en) * 1995-03-02 1996-04-16 Becker; Richard S. Article tag
US5798693A (en) * 1995-06-07 1998-08-25 Engellenner; Thomas J. Electronic locating systems
US7123129B1 (en) 1995-08-14 2006-10-17 Intermec Ip Corp. Modulation of the resonant frequency of a circuit using an energy field
US5812065A (en) * 1995-08-14 1998-09-22 International Business Machines Corporation Modulation of the resonant frequency of a circuit using an energy field
US7002475B2 (en) * 1997-12-31 2006-02-21 Intermec Ip Corp. Combination radio frequency identification transponder (RFID tag) and magnetic electronic article surveillance (EAS) tag
CA2251326C (en) * 1996-04-10 2003-06-17 Sentry Technology Corporation Electronic article surveillance system
US5909178A (en) * 1997-11-28 1999-06-01 Sensormatic Electronics Corporation Signal detection in high noise environments

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115622A (en) * 1958-10-15 1963-12-24 Polard Electronics Corp Panoramic scanning counter
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection
US3521280A (en) * 1969-01-16 1970-07-21 Gen Res Corp Coded labels
US3624631A (en) * 1970-04-27 1971-11-30 Sanders Associates Inc Pilferage control system
US3696379A (en) * 1970-12-02 1972-10-03 Knogo Corp Apparatus for article theft detection
US3752960A (en) * 1971-12-27 1973-08-14 C Walton Electronic identification & recognition system

Also Published As

Publication number Publication date
US3828337A (en) 1974-08-06
BR7406375D0 (pt) 1975-06-03
FR2241837A1 (enrdf_load_stackoverflow) 1975-03-21
JPS5051300A (enrdf_load_stackoverflow) 1975-05-08
JPS533913B2 (enrdf_load_stackoverflow) 1978-02-10
CA1033027A (en) 1978-06-13
DE2438218A1 (de) 1975-02-27
ZA744889B (en) 1975-08-27
GB1484353A (en) 1977-09-01
IT1011583B (it) 1977-02-10
FR2241837B1 (enrdf_load_stackoverflow) 1978-11-24

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8125 Change of the main classification

Ipc: G08B 13/22

D2 Grant after examination
8364 No opposition during term of opposition