GB1514982A - Signal discrimination circuitry in an electronic security system - Google Patents

Signal discrimination circuitry in an electronic security system

Info

Publication number
GB1514982A
GB1514982A GB27759/75A GB2775975A GB1514982A GB 1514982 A GB1514982 A GB 1514982A GB 27759/75 A GB27759/75 A GB 27759/75A GB 2775975 A GB2775975 A GB 2775975A GB 1514982 A GB1514982 A GB 1514982A
Authority
GB
United Kingdom
Prior art keywords
pulse
signal
response
counter
signals
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
GB27759/75A
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 GB1514982A publication Critical patent/GB1514982A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
GB27759/75A 1974-07-02 1975-07-01 Signal discrimination circuitry in an electronic security system Expired GB1514982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/485,206 US3961322A (en) 1974-07-02 1974-07-02 Real time signal discrimination circuitry

Publications (1)

Publication Number Publication Date
GB1514982A true GB1514982A (en) 1978-06-21

Family

ID=23927306

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27759/75A Expired GB1514982A (en) 1974-07-02 1975-07-01 Signal discrimination circuitry in an electronic security system

Country Status (7)

Country Link
US (1) US3961322A (enExample)
JP (1) JPS551640B2 (enExample)
CA (1) CA1035442A (enExample)
DE (1) DE2529589C2 (enExample)
FR (1) FR2277386A2 (enExample)
GB (1) GB1514982A (enExample)
IT (1) IT1036405B (enExample)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4117466A (en) * 1977-03-14 1978-09-26 Lichtblau G J Beat frequency interference rejection circuit
GB1604219A (en) * 1977-04-28 1981-12-02 Parmeko Ltd Detection systems
US4290056A (en) * 1979-07-05 1981-09-15 Ellsworth, Chow & Murphy, Inc. Protective system
DE3632624C1 (de) * 1986-09-25 1988-03-10 Balluff Gebhard Feinmech Stoerfeldunempfindlicher Naeherungsschalter
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
DE4200082A1 (de) * 1992-01-03 1993-07-08 Minnesota Mining & Mfg Vorrichtung und verfahren zum erkennen eines magnetisierbaren markierungselementes
EP1288841A1 (en) * 2001-08-30 2003-03-05 Motorola, Inc. Passive response communication system
US9501916B2 (en) 2012-03-20 2016-11-22 Tyco Fire & Security Gmbh Inventory management system using event filters for wireless sensor network data
CN112265330B (zh) * 2020-11-05 2021-06-25 杭州盛得新材料有限公司 一种回收改性pvb的织物层压体及其制备方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863244A (en) * 1972-06-14 1975-01-28 Lichtblau G J Electronic security system having improved noise discrimination

Also Published As

Publication number Publication date
US3961322A (en) 1976-06-01
DE2529589C2 (de) 1985-08-08
FR2277386A2 (fr) 1976-01-30
CA1035442A (en) 1978-07-25
JPS5128499A (enExample) 1976-03-10
FR2277386B2 (enExample) 1979-03-30
JPS551640B2 (enExample) 1980-01-16
DE2529589A1 (de) 1976-01-22
IT1036405B (it) 1979-10-30

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Legal Events

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

Effective date: 19950630