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AU2002222441A1 - A method and apparatus for receiving an amplitude modulated radiosignal - Google Patents

A method and apparatus for receiving an amplitude modulated radiosignal

Info

Publication number
AU2002222441A1
AU2002222441A1 AU2002222441A AU2244102A AU2002222441A1 AU 2002222441 A1 AU2002222441 A1 AU 2002222441A1 AU 2002222441 A AU2002222441 A AU 2002222441A AU 2244102 A AU2244102 A AU 2244102A AU 2002222441 A1 AU2002222441 A1 AU 2002222441A1
Authority
AU
Australia
Prior art keywords
signal
microprocessor
channel
channels
tuner
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.)
Abandoned
Application number
AU2002222441A
Inventor
Jeremy John Greenwood
Patrick John Lyons
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.)
Jaguar Land Rover Ltd
Hi Key Ltd
Original Assignee
Land Rover UK Ltd
Hi Key Ltd
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 Land Rover UK Ltd, Hi Key Ltd filed Critical Land Rover UK Ltd
Publication of AU2002222441A1 publication Critical patent/AU2002222441A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00238—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00555—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks comprising means to detect or avoid relay attacks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/61—Signal comprising different frequencies, e.g. frequency hopping

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Noise Elimination (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

Receiving apparatus ( 1 ) for receiving an amplitude modulated signal which may be transmitted on a plurality of frequency channels within a predetermined frequency bandwidth comprises a tuner ( 3 ) for sequentially scanning through the channels under the control of a microprocessor ( 6 ) which determines the presence of a signal on a channel to which the tuner ( 3 ) is tuned. A first validation circuit ( 10 ) determines if the received signal is a valid type signal, and if so the microprocessor ( 6 ) counts the channels from the channel on which the signal is first detected to the channel on which the signal can no longer be detected is reached. The microprocessor ( 6 ) determines the middle one of the channels in which the signal is detected, and the microprocessor ( 6 ) locks the tuner ( 3 ) onto the frequency of the middle channel, and simultaneously operates a gate circuit ( 11 ) for outputting at least one complete signal to security apparatus of a motor vehicle for switching the state of the security apparatus from one of an armed and a disarmed state to the other of the armed and disarmed state. A noise suppressing circuit ( 9 ) is responsive to a noise analyzing circuit ( 8 ) under the control of the microprocessor ( 6 ) for suppressing noise in the received signal.
AU2002222441A 2000-12-20 2001-12-20 A method and apparatus for receiving an amplitude modulated radiosignal Abandoned AU2002222441A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IE2000/1054 2000-12-20
IE20001054 2000-12-20
PCT/IE2001/000161 WO2002049888A1 (en) 2000-12-20 2001-12-20 A method and apparatus for receiving an amplitude modulated radiosignal

Publications (1)

Publication Number Publication Date
AU2002222441A1 true AU2002222441A1 (en) 2002-07-01

Family

ID=11042700

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2002222441A Abandoned AU2002222441A1 (en) 2000-12-20 2001-12-20 A method and apparatus for receiving an amplitude modulated radiosignal

Country Status (7)

Country Link
US (1) US7099638B2 (en)
EP (1) EP1343664B1 (en)
AT (1) ATE395226T1 (en)
AU (1) AU2002222441A1 (en)
DE (1) DE60134038D1 (en)
IE (1) IES20011092A2 (en)
WO (1) WO2002049888A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7359448B2 (en) 2002-08-21 2008-04-15 Lear Corporation Remote transmitter system and method
DE10301146B4 (en) * 2003-01-14 2014-07-10 Robert Bosch Gmbh A security system
US6990324B2 (en) * 2004-04-15 2006-01-24 Flarion Technologies, Inc. Methods and apparatus for selecting between multiple carriers using a single receiver chain tuned to a single carrier
US20060045018A1 (en) * 2004-08-25 2006-03-02 Ahmad Masri Device, system and method for varying scanning time on a channel
KR100765319B1 (en) * 2005-09-13 2007-10-09 삼성전자주식회사 Channel searching method and apparatus thereof in broadcasting system
US7577412B2 (en) * 2005-12-23 2009-08-18 Intermec Ip Corp. System and method for detecting narrow bandwidth signal content to determine channel occupancy
US8111133B2 (en) * 2007-03-16 2012-02-07 Homerun Holdings Corporation System for processing multiple signal frequencies and data formats for a barrier operator
JP5109813B2 (en) * 2008-05-30 2012-12-26 アイコム株式会社 Frequency scanning method and receiver
DE102014010002A1 (en) * 2014-07-05 2016-01-07 Audi Ag Device for controlling a device of a motor vehicle, associated device and operating method
US9792744B2 (en) * 2015-06-01 2017-10-17 Schlage Lock Company Llc Antenna diversity implementation for wireless locks
US20220361089A1 (en) * 2021-05-06 2022-11-10 Apple Inc. Systems and methods for supporting evolving band regulations

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6411408A (en) * 1987-07-03 1989-01-17 Nec Corp Automatic frequency sweeping method for frequency synthesizer type channel selecting device
US5161168A (en) * 1991-05-15 1992-11-03 Scs Mobilecom, Inc. Spread spectrum CDMA communications system microwave overlay
US5587715A (en) * 1993-03-19 1996-12-24 Gps Mobile, Inc. Method and apparatus for tracking a moving object
US5621767A (en) * 1994-09-30 1997-04-15 Hughes Electronics Method and device for locking on a carrier signal by dividing frequency band into segments for segment signal quality determination and selecting better signal quality segment
GB9816170D0 (en) 1997-12-20 1998-09-23 Rover Group A security system
US6173166B1 (en) * 1998-06-29 2001-01-09 Visteon Global Technologies, Inc. Detection and correction of multipath in an FM receiver
AU1794400A (en) 1998-12-22 2000-07-12 Hi-Key Limited A receiver and a variable frequency signal generating circuit for the receiver
US6560270B1 (en) * 1999-03-04 2003-05-06 Northrop Grumman Corporation Method for tuning a spread spectrum receiver
US6804262B1 (en) * 2000-04-28 2004-10-12 3Com Corporation Method and apparatus for channel determination through power measurements

Also Published As

Publication number Publication date
WO2002049888A1 (en) 2002-06-27
EP1343664A1 (en) 2003-09-17
ATE395226T1 (en) 2008-05-15
IES20011092A2 (en) 2002-07-10
EP1343664B1 (en) 2008-05-14
US20040041692A1 (en) 2004-03-04
DE60134038D1 (en) 2008-06-26
US7099638B2 (en) 2006-08-29

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