JPS59118085U - 電子防備システムの干渉除去回路 - Google Patents

電子防備システムの干渉除去回路

Info

Publication number
JPS59118085U
JPS59118085U JP1983199111U JP19911183U JPS59118085U JP S59118085 U JPS59118085 U JP S59118085U JP 1983199111 U JP1983199111 U JP 1983199111U JP 19911183 U JP19911183 U JP 19911183U JP S59118085 U JPS59118085 U JP S59118085U
Authority
JP
Japan
Prior art keywords
frequency
beat
signal
transmitter
interference
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.)
Granted
Application number
JP1983199111U
Other languages
English (en)
Other versions
JPS5937910Y2 (ja
Inventor
ジヨ−ジ・ジエイ・リヒトブラウ
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 JPS59118085U publication Critical patent/JPS59118085U/ja
Application granted granted Critical
Publication of JPS5937910Y2 publication Critical patent/JPS5937910Y2/ja
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
    • G08B13/2465—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)
  • Signal Processing (AREA)
  • Physics & Mathematics (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)
  • Noise Elimination (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【図面の簡単な説明】
第１図は、本考案を採用した電子防備システムを示すブ
ロックダイヤグラムである。第２Ａ図及び第２Ｂ図は、
それぞれうなり周波数信号と共振タグ信号の周波数スペ
クトルを表わす。 １０・・・送信機、１２・・・発信アンテナ、１５・・
・共振タグ回路、１４・・・受信アンテナ、１６・・・
ＲＦ前端部、１Ｂ・・・検波器、２０・・・高域フィル
タ、２２・・・低域フィルタ、２４・・・信号処理装置
、２６・・・警報器、３０・・・高域フィルタ、３２・
・ゼデオ増幅器、３４・・・閾値検波器、３６・・・マ
ルチバイブレータ、２８・・・干渉原送信機、２９・・
・アンテナ。

Claims (1)

  1. 【実用新案登録請求の範囲】 １　所定の範囲に渡って、反復的に掃引される周波数で
    電磁場を生成する送信機と、掃引範囲内の共振周波数を
    有する共振タグと、掃引場によって生成される該タグの
    全ての共振周波数を検出して警報を表示する受信手段と
    を有する電子防備システムに用いられる、 共振タグ信号と、掃引範囲内の周波数を有する固定周波
    数送信機によって生成された偽の信号とを弁別する干渉
    除去回路において、該受信手段からの検波出力信号に応
    じて、掃引送信機の周波数と干渉原送信機の固定周波数
    との干渉によってもたらされるうなり周波数を検出する
    手段と、 上記の検出の際にうなり干渉が持続する間該警報表示を
    抑制する信号を発生する手段とを具備し、 該うなり周波数検出手段が、該うなり干渉によって発生
    する周波数成分を通過させる一方、該共振タグによって
    発信される全ての周波数成分を実質的に阻止するに十分
    なカットオフ周波数を有する高域フィルタ手段を含むこ
    とを特徴とする干渉除去回路。 ２　該警報抑制手段が、該高域フィルタからの出力信号
    に応じて、該うなり干渉の持続時間に対応する長さの抑
    制信号を発生させる回路手段を含む実用新案登録請求の
    範囲第１項記際の回路。
JP1983199111U 1977-03-14 1983-12-27 電子防備システムの干渉除去回路 Expired JPS5937910Y2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/777,524 US4117466A (en) 1977-03-14 1977-03-14 Beat frequency interference rejection circuit
US777524 1977-03-14

Publications (2)

Publication Number Publication Date
JPS59118085U true JPS59118085U (ja) 1984-08-09
JPS5937910Y2 JPS5937910Y2 (ja) 1984-10-20

Family

ID=25110489

Family Applications (2)

Application Number Title Priority Date Filing Date
JP5891677A Pending JPS53113492A (en) 1977-03-14 1977-05-23 Electronic protecting system and circuit for deleting interference of beat frequency
JP1983199111U Expired JPS5937910Y2 (ja) 1977-03-14 1983-12-27 電子防備システムの干渉除去回路

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP5891677A Pending JPS53113492A (en) 1977-03-14 1977-05-23 Electronic protecting system and circuit for deleting interference of beat frequency

Country Status (13)

Country Link
US (1) US4117466A (ja)
JP (2) JPS53113492A (ja)
AU (1) AU511099B2 (ja)
CA (1) CA1073076A (ja)
DE (1) DE2725169C2 (ja)
DK (1) DK147169C (ja)
ES (1) ES459235A1 (ja)
FR (1) FR2384306A1 (ja)
GB (1) GB1580412A (ja)
IT (1) IT1082816B (ja)
MX (1) MX143644A (ja)
SE (1) SE427882B (ja)
ZA (1) ZA772858B (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484182A (en) * 1981-07-01 1984-11-20 Shorrock Developments Limited Intruder detection apparatus for functioning free of disturbance while in close proximity to high-power pulse-moldulated radars
US4429302A (en) * 1981-10-08 1984-01-31 I. D. Engineering, Inc. Electronic security system with noise rejection
NL8202951A (nl) * 1982-07-21 1984-02-16 Nedap Nv Absorptiedetectiestelsel.
US4595915A (en) * 1984-02-06 1986-06-17 Mrs. Lawrence Israel Electronic surveillance system employing the doppler effect
US4565996A (en) * 1984-02-06 1986-01-21 Mrs. Lawrence Israel Range limited coherent frequency doppler surveillance system
US4728938A (en) * 1986-01-10 1988-03-01 Checkpoint Systems, Inc. Security tag deactivation system
NL8600738A (nl) * 1986-03-24 1987-10-16 Nedap Nv Onderdrukking van valse alarmen als gevolg van aanraken.
US4779077A (en) * 1987-04-13 1988-10-18 Lichtblau G J Continuously armed high reliability pulse train processor
US5508684A (en) * 1995-03-02 1996-04-16 Becker; Richard S. Article tag
GB9702242D0 (en) * 1997-02-04 1997-03-26 Plessey Semiconductors Ltd Alarm sensor and antenna arrangement
US9590761B2 (en) * 2011-09-23 2017-03-07 Commscope Technologies Llc Detective passive RF components using radio frequency identification tags

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696379A (en) * 1970-12-02 1972-10-03 Knogo Corp Apparatus for article theft detection
US3810147A (en) * 1971-12-30 1974-05-07 G Lichtblau Electronic security system
US3863244A (en) * 1972-06-14 1975-01-28 Lichtblau G J Electronic security system having improved noise discrimination
US3818472A (en) * 1972-05-26 1974-06-18 K Mauk R.f. system for detecting unauthorized travel of articles through a selected zone
US3967161A (en) * 1972-06-14 1976-06-29 Lichtblau G J A multi-frequency resonant tag circuit for use with an electronic security system having improved noise discrimination
NL161904C (nl) * 1973-04-13 Knogo Corp Diefstal-detectiestelsel.
US3961322A (en) * 1974-07-02 1976-06-01 Lichtblau G J Real time signal discrimination circuitry

Also Published As

Publication number Publication date
ES459235A1 (es) 1978-08-01
SE427882B (sv) 1983-05-09
JPS53113492A (en) 1978-10-03
JPS5937910Y2 (ja) 1984-10-20
GB1580412A (en) 1980-12-03
AU511099B2 (en) 1980-07-31
DK147169C (da) 1984-10-15
DK147169B (da) 1984-04-30
IT1082816B (it) 1985-05-21
AU2535277A (en) 1978-11-23
DE2725169A1 (de) 1978-09-21
FR2384306B1 (ja) 1983-05-13
FR2384306A1 (fr) 1978-10-13
DE2725169C2 (de) 1985-08-22
SE7704988L (sv) 1978-09-15
US4117466A (en) 1978-09-26
CA1073076A (en) 1980-03-04
MX143644A (es) 1981-06-17
DK189477A (da) 1978-09-15
ZA772858B (en) 1978-04-26

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