DE3674872D1 - Synchrondetektor. - Google Patents

Synchrondetektor.

Info

Publication number
DE3674872D1
DE3674872D1 DE8686111390T DE3674872T DE3674872D1 DE 3674872 D1 DE3674872 D1 DE 3674872D1 DE 8686111390 T DE8686111390 T DE 8686111390T DE 3674872 T DE3674872 T DE 3674872T DE 3674872 D1 DE3674872 D1 DE 3674872D1
Authority
DE
Germany
Prior art keywords
synchronous detector
synchronous
detector
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
DE8686111390T
Other languages
English (en)
Inventor
John Joseph Torre
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.)
IDENTITECH CORP
Original Assignee
IDENTITECH CORP
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 IDENTITECH CORP filed Critical IDENTITECH CORP
Application granted granted Critical
Publication of DE3674872D1 publication Critical patent/DE3674872D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G08B13/2408—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 ferromagnetic 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
    • G08B13/2488—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)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Phase Differences (AREA)
DE8686111390T 1985-09-17 1986-08-18 Synchrondetektor. Expired - Lifetime DE3674872D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/777,060 US4644286A (en) 1985-09-17 1985-09-17 Article surveillance system receiver using synchronous demodulation and signal integration

Publications (1)

Publication Number Publication Date
DE3674872D1 true DE3674872D1 (de) 1990-11-15

Family

ID=25109169

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686111390T Expired - Lifetime DE3674872D1 (de) 1985-09-17 1986-08-18 Synchrondetektor.

Country Status (4)

Country Link
US (1) US4644286A (de)
EP (1) EP0216128B1 (de)
JP (1) JPH0758330B2 (de)
DE (1) DE3674872D1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8603415D0 (sv) * 1986-08-14 1986-08-14 Leif Arnold Persson Remote sensing of metglas identifiers
DE3632624C1 (de) * 1986-09-25 1988-03-10 Balluff Gebhard Feinmech Stoerfeldunempfindlicher Naeherungsschalter
US5241923A (en) * 1992-07-23 1993-09-07 Pole/Zero Corporation Transponder control of animal whereabouts
US5602527A (en) * 1995-02-23 1997-02-11 Dainippon Ink & Chemicals Incorporated Magnetic marker for use in identification systems and an indentification system using such magnetic marker
US5783871A (en) * 1996-09-24 1998-07-21 Trw Inc. Apparatus and method for sensing a rearward facing child seat
US6266592B1 (en) 1996-10-11 2001-07-24 Trw Inc. Apparatus and method for sensing a rearward facing child seat using beat frequency detection
US6064308A (en) * 1996-10-25 2000-05-16 Pole/Zero Corporation RF signaling system and system for controlling the whereabouts of animals using same
US6446049B1 (en) 1996-10-25 2002-09-03 Pole/Zero Corporation Method and apparatus for transmitting a digital information signal and vending system incorporating same
US5745039A (en) * 1997-02-21 1998-04-28 Minnesota Mining And Manufacturing Company Remote sterilization monitor
US6166643A (en) * 1997-10-23 2000-12-26 Janning; Joseph J. Method and apparatus for controlling the whereabouts of an animal
US5909178A (en) * 1997-11-28 1999-06-01 Sensormatic Electronics Corporation Signal detection in high noise environments
US6118378A (en) * 1997-11-28 2000-09-12 Sensormatic Electronics Corporation Pulsed magnetic EAS system incorporating single antenna with independent phasing
US5969659A (en) * 1997-11-28 1999-10-19 Sensormatic Electronics Corporation Analog to digital converters with extended dynamic range
US6188310B1 (en) 1997-11-28 2001-02-13 Sensormatic Electronics Corporation Natural frequency measurement of magnetic markers
US5995002A (en) * 1997-11-28 1999-11-30 Sensormatic Electronics Corporation Line synchronized delays for multiple pulsed EAS systems

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
JPS533913A (en) * 1976-07-01 1978-01-14 Kiyuuroku Kk Method of heatttreating with laser beams
US4135184A (en) * 1977-08-31 1979-01-16 Knogo Corporation Electronic theft detection system for monitoring wide passageways
US4215342A (en) * 1978-03-31 1980-07-29 Intex Inc. Merchandise tagging technique
JPS551640A (en) * 1978-06-20 1980-01-08 Hitachi Maxell Ltd Magnetic recording medium
US4300183A (en) * 1980-03-27 1981-11-10 Richardson Robert H Method and apparatus for generating alternating magnetic fields to produce harmonic signals from a metallic strip
US4354235A (en) * 1980-06-30 1982-10-12 Portec, Inc. Guidance system detector circuit
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
NL8200138A (nl) * 1982-01-14 1983-08-01 Nedap Nv Detectiestelsel.
JPS5940287A (ja) * 1982-08-31 1984-03-05 Anritsu Corp 金属検出装置
JPS6078378A (ja) * 1983-10-05 1985-05-04 Anritsu Corp 金属検出装置

Also Published As

Publication number Publication date
EP0216128A1 (de) 1987-04-01
EP0216128B1 (de) 1990-10-10
US4644286A (en) 1987-02-17
JPS6269183A (ja) 1987-03-30
JPH0758330B2 (ja) 1995-06-21

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition