CA2174886A1 - Proximity Alarm System - Google Patents

Proximity Alarm System

Info

Publication number
CA2174886A1
CA2174886A1 CA2174886A CA2174886A CA2174886A1 CA 2174886 A1 CA2174886 A1 CA 2174886A1 CA 2174886 A CA2174886 A CA 2174886A CA 2174886 A CA2174886 A CA 2174886A CA 2174886 A1 CA2174886 A1 CA 2174886A1
Authority
CA
Canada
Prior art keywords
transceiver station
stations
distance
alarm
station
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
CA2174886A
Other languages
French (fr)
Other versions
CA2174886C (en
Inventor
Nicola R. Sala
Rocco L. Sala
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 CA2174886A1 publication Critical patent/CA2174886A1/en
Application granted granted Critical
Publication of CA2174886C publication Critical patent/CA2174886C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1427—Mechanical actuation by lifting or attempted removal of hand-portable articles with transmitter-receiver for distance detection

Abstract

The spatial separation of an object from a reference location is monitored utilizing a proximity alarm system which comprises a transceiver station mounted on the object and a repeater station at the reference location. Both stations function to generate and transmit an encoded rf signal in a half-duplex manner, with the transceiver station initiating the process. In one embodiment of the system, a phase delay is measured between a remote signal originating at the transceiver station and a corresponding decoded timing signal received from the repeater station. Correlation of the phase delay with a reference value ascertains the distance between the stations and an alarm at the transceiver station is actuated when the distance exceeds a predetermined value. A
second embodiment of the system employs a clock driven counter that is stopped when a predetermined multiple of decoded timing signals is received at the transceiver station in response to iterative transmissions therefrom. The count value of the counter is read and correlated with a transit time reference value to ascertain the distance between stations. An alarm is actuated if the distance exceeds a predetermined maximum.
CA002174886A 1995-04-28 1996-04-24 Proximity alarm system Expired - Fee Related CA2174886C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/430232 1995-04-28
US08/430,232 US5583488A (en) 1995-04-28 1995-04-28 Proximity alarm system

Publications (2)

Publication Number Publication Date
CA2174886A1 true CA2174886A1 (en) 1996-10-29
CA2174886C CA2174886C (en) 2000-02-29

Family

ID=23706646

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002174886A Expired - Fee Related CA2174886C (en) 1995-04-28 1996-04-24 Proximity alarm system

Country Status (2)

Country Link
US (1) US5583488A (en)
CA (1) CA2174886C (en)

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7362775B1 (en) 1996-07-02 2008-04-22 Wistaria Trading, Inc. Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management
US5613004A (en) 1995-06-07 1997-03-18 The Dice Company Steganographic method and device
US6205249B1 (en) 1998-04-02 2001-03-20 Scott A. Moskowitz Multiple transform utilization and applications for secure digital watermarking
US7664263B2 (en) 1998-03-24 2010-02-16 Moskowitz Scott A Method for combining transfer functions with predetermined key creation
US7159116B2 (en) 1999-12-07 2007-01-02 Blue Spike, Inc. Systems, methods and devices for trusted transactions
US7346472B1 (en) 2000-09-07 2008-03-18 Blue Spike, Inc. Method and device for monitoring and analyzing signals
US5889868A (en) 1996-07-02 1999-03-30 The Dice Company Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US7107451B2 (en) * 1996-07-02 2006-09-12 Wistaria Trading, Inc. Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US7457962B2 (en) 1996-07-02 2008-11-25 Wistaria Trading, Inc Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US7095874B2 (en) 1996-07-02 2006-08-22 Wistaria Trading, Inc. Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US6078664A (en) * 1996-12-20 2000-06-20 Moskowitz; Scott A. Z-transform implementation of digital watermarks
US7177429B2 (en) 2000-12-07 2007-02-13 Blue Spike, Inc. System and methods for permitting open access to data objects and for securing data within the data objects
US5708421A (en) * 1996-08-19 1998-01-13 Radio Systems Corp. System for tracking an article or person
GB2318672B (en) * 1996-10-23 2001-03-21 Nokia Mobile Phones Ltd Radiotelephone proximity detector
US7730317B2 (en) 1996-12-20 2010-06-01 Wistaria Trading, Inc. Linear predictive coding implementation of digital watermarks
US6078269A (en) * 1997-11-10 2000-06-20 Safenight Technology Inc. Battery-powered, RF-interconnected detector sensor system
US6133830A (en) * 1998-06-19 2000-10-17 Lexent Technologies, Inc. Motion sensitive anti-theft device with alarm screening
US6265974B1 (en) 1998-06-19 2001-07-24 Lexent Technologies, Inc. Systems and methods for monitoring spatial relationship between mobile objects
US5963131A (en) * 1998-06-19 1999-10-05 Lexent Technologies, Inc. Anti-theft device with alarm screening
US6133829A (en) * 1999-03-05 2000-10-17 Frl, Inc. Walk-through metal detector system and method
US7664264B2 (en) 1999-03-24 2010-02-16 Blue Spike, Inc. Utilizing data reduction in steganographic and cryptographic systems
US7475246B1 (en) 1999-08-04 2009-01-06 Blue Spike, Inc. Secure personal content server
US6265975B1 (en) * 2000-02-25 2001-07-24 Harry I. Zimmerman Proximity system for baggage
US7127615B2 (en) 2000-09-20 2006-10-24 Blue Spike, Inc. Security based on subliminal and supraliminal channels for data objects
US7287275B2 (en) 2002-04-17 2007-10-23 Moskowitz Scott A Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US6747555B2 (en) 2002-09-24 2004-06-08 International Business Machines Corporation Tracking apparatus and associated method for a radio frequency enabled reminder system
US20050200487A1 (en) * 2004-03-06 2005-09-15 O'donnell Ryan Methods and devices for monitoring the distance between members of a group
US7503484B2 (en) * 2004-09-10 2009-03-17 Capital One Financial Corporation Methods, systems, and articles of manufacture for a financial card having warning features
WO2006116664A1 (en) * 2005-04-26 2006-11-02 Rf Code, Inc. Tamper monitoring system and method
US20070120698A1 (en) * 2005-11-29 2007-05-31 Jordan Turk System for monitoring the proximity of personal articles
US7817038B2 (en) * 2007-01-22 2010-10-19 Microsoft Corporation Object detection framework for set of related objects
US20080204239A1 (en) * 2007-02-28 2008-08-28 Christopher Marszalek Apparatus, system and/or method for wirelessly securing and/or for wirelessly monitoring an article
US20110221633A1 (en) * 2010-03-11 2011-09-15 Benjamin Bela Schramm Methods and systems for determining the distance between two objects using wirelessly transmitted pulses
US9071300B2 (en) * 2012-07-23 2015-06-30 Wistron Neweb Corporation Signal transceiver with enhanced return loss in power-off state
US9799203B1 (en) 2016-11-16 2017-10-24 Lester Fritz Separation alert device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE456118B (en) * 1985-12-12 1988-09-05 Stiftelsen Inst Mikrovags PROCEDURE AND DEVICE FOR MEASURING DISTANCE BETWEEN A SUBSTANCE AND ANOTHER FORM WITH SIGNALS OF MICROWAVE FREQUENCY
GB8810872D0 (en) * 1988-05-07 1988-06-08 Transalarm Ltd Security system
US5043702A (en) * 1990-05-09 1991-08-27 Kuo Chun Chang Luggage with alarm device
US5402104A (en) * 1993-06-09 1995-03-28 Larosa; Lazaro Scanning excessive separation alarm

Also Published As

Publication number Publication date
CA2174886C (en) 2000-02-29
US5583488A (en) 1996-12-10

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