GB1484353A - Electronic security systems incorporating noise rejection circuitry - Google Patents

Electronic security systems incorporating noise rejection circuitry

Info

Publication number
GB1484353A
GB1484353A GB36028/74A GB3602874A GB1484353A GB 1484353 A GB1484353 A GB 1484353A GB 36028/74 A GB36028/74 A GB 36028/74A GB 3602874 A GB3602874 A GB 3602874A GB 1484353 A GB1484353 A GB 1484353A
Authority
GB
United Kingdom
Prior art keywords
circuit
flop
electronic security
flip
output
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
GB36028/74A
Other languages
English (en)
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 GB1484353A publication Critical patent/GB1484353A/en
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)
  • Credit Cards Or The Like (AREA)
  • Geophysics And Detection Of Objects (AREA)
GB36028/74A 1973-08-20 1974-08-15 Electronic security systems incorporating noise rejection circuitry Expired GB1484353A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1484353A true GB1484353A (en) 1977-09-01

Family

ID=23539479

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36028/74A Expired GB1484353A (en) 1973-08-20 1974-08-15 Electronic security systems incorporating noise rejection circuitry

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278900A (en) 1979-02-15 1981-07-14 Westinghouse Electric Corp. Fail-safe pulse providing apparatus
GB2282720A (en) * 1993-09-10 1995-04-12 Thomson Consumer Electronics Circuit for synchronizing a microprocessor in a TV receiver

Families Citing this family (17)

* 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
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
KR950004714B1 (ko) * 1988-06-20 1995-05-04 체크 포인트 시스템스, 인코오퍼레이티드 연속적으로 보강된 고신뢰성 펄스열 처리기
DE69033093T2 (de) 1989-10-31 1999-12-09 Checkpoint Systems, Inc. Verfahren zum etikettieren von artikeln in verbindung mit einem elektronischen artikelüberwachungssystem
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
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
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
US5812065A (en) 1995-08-14 1998-09-22 International Business Machines Corporation Modulation of the resonant frequency of a circuit using an energy field
WO1997038404A1 (en) * 1996-04-10 1997-10-16 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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4278900A (en) 1979-02-15 1981-07-14 Westinghouse Electric Corp. Fail-safe pulse providing apparatus
GB2282720A (en) * 1993-09-10 1995-04-12 Thomson Consumer Electronics Circuit for synchronizing a microprocessor in a TV receiver

Also Published As

Publication number Publication date
BR7406375D0 (pt) 1975-06-03
US3828337A (en) 1974-08-06
JPS533913B2 (enrdf_load_stackoverflow) 1978-02-10
DE2438218C2 (de) 1985-08-14
CA1033027A (en) 1978-06-13
IT1011583B (it) 1977-02-10
FR2241837A1 (enrdf_load_stackoverflow) 1975-03-21
ZA744889B (en) 1975-08-27
JPS5051300A (enrdf_load_stackoverflow) 1975-05-08
FR2241837B1 (enrdf_load_stackoverflow) 1978-11-24
DE2438218A1 (de) 1975-02-27

Similar Documents

Publication Publication Date Title
GB1484353A (en) Electronic security systems incorporating noise rejection circuitry
ATE32277T1 (de) Elektronisches sicherheitssystem mit geraeuschzurueckweisung.
ES8103422A1 (es) Procedimiento y disposicion de circuito para la comprobacionde la entrada y-o la salida de un vehiculo,en especial de unvehiculo de trafico rodado,en y respectivamente de una zona de control fijada
SE8205993L (sv) Sett och apparat for uppteckande av stold genom detektering av avklingningen i en resonanskrets
US4054871A (en) Electromagnetic intrusion sensor
US4236147A (en) Automatic doorbell
JPS56106457A (en) Extracting system of clock signal
GB1126996A (en) Signal discriminating
GB1514982A (en) Signal discrimination circuitry in an electronic security system
GB1433233A (en) Frequency sensitive switching circuits
JPS56138340A (en) Reception signal level detecting system for superregenerative receiver
US3825842A (en) Pulse rate discriminator generating output only at predetermined input frequency
JPS5750021A (en) Periodic signal detector
US3603988A (en) Pulse density demodulator
SU972539A1 (ru) Устройство дл обнаружени объекта в контролируемой зоне
JPS56125602A (en) Moving object detector
GB1364436A (en) Theft detection system
GB1237109A (en) Discriminating amplifier for high frequency detection devices
JPS54136102A (en) Electronic tuning type receiver
JPS56156091A (en) Remote control method
JPS5732165A (en) Multifrequency signal receiver
SU1642489A1 (ru) Устройство дл учета посетителей
ES8605916A1 (es) Procedimiento de detectar cuerpos errantes en un reactor nuclear
JPS5589783A (en) Discrimination circuit for time casting signal
GB1339120A (en) Electronic logic control apparatus

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19940814