WO2001022379A1 - Surveillance de presence electronique - Google Patents

Surveillance de presence electronique Download PDF

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Publication number
WO2001022379A1
WO2001022379A1 PCT/EP1999/006950 EP9906950W WO0122379A1 WO 2001022379 A1 WO2001022379 A1 WO 2001022379A1 EP 9906950 W EP9906950 W EP 9906950W WO 0122379 A1 WO0122379 A1 WO 0122379A1
Authority
WO
WIPO (PCT)
Prior art keywords
monitoring device
distance
mobile phone
section
transmitter
Prior art date
Application number
PCT/EP1999/006950
Other languages
English (en)
Inventor
Pascal Feuillarade
Original Assignee
Pascal Feuillarade
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 Pascal Feuillarade filed Critical Pascal Feuillarade
Priority to PCT/EP1999/006950 priority Critical patent/WO2001022379A1/fr
Priority to EP99947388A priority patent/EP1221152B1/fr
Priority to DE69907760T priority patent/DE69907760D1/de
Priority to AT99947388T priority patent/ATE239960T1/de
Priority to AU60857/99A priority patent/AU6085799A/en
Publication of WO2001022379A1 publication Critical patent/WO2001022379A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0263—System arrangements wherein the object is to detect the direction in which child or item is located
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0294—Display details on parent unit

Definitions

  • the present invention relates to electronic surveillance systems for surveilling the presence of a mobile object within a 5 . certain distance with respect to a monitoring device surveilling the mobile object.
  • a system generally consists of primarily a transmitter, a receiver and a processing unit for processing the data or signals from the transmitter and received by the receiver.
  • the invention especially relates to such 0 systems which further release an alarm, when a threshold distance between the mobile object and the monitoring device is exceeded, and which are able to determine and indicate the direction of the mobile object with respect to the monitoring unit . 5
  • Hawthorne U.S. Pat. No. 4,785,291 discloses a system for determining and indicating the distance between a transmitter and a receiver (monitor) , in which the signal indicated on the receiver turns into an alarm mode signal, as soon as a threshold 0 distance is exceeded by the transmitter. This system is not able to monitor the direction of the transmitter.
  • the receiver (monitoring device) is a box intended for stationary use.
  • Perez et al . U.S. Pat. No. 5,289,163
  • Musa U.S. Pat. No. 5,557,259
  • the monitoring device is a box, attacheable to a person.
  • Musa the monitoring device has the form of a bracelet, attacheable to the wrist of a person.
  • Dalsace suggests a transmitter- receiver system for releasing an audible or vibrating alarm, when a selectable predetermined threshold distance is exceeded.
  • This system does not provide a direction monitoring option.
  • Pearl www.pearl.com
  • Pearl has revealed a surveillance system, wherein the distance and the direction between a monitor box and an element attacheable to the person to be surveilled (e.g. a child) may be displayed on an LCD display. This system does not provide an alarm option for releasing an alarm when a preset threshold distance is exceeded.
  • a compact, portable surveillance system for surveilling the presence of a mobile object within a predetermined distance range of up to typically several 10 metres with respect to a monitoring device.
  • a system is a useful instrument e.g. for an adult having the charge of a playing child. She/he can attach the mobile object to the child and have the monitoring device with her/him, and thus she/he can surveille the presence of the child without the need of permanent direct visual or mechanical contact to the child, which would prevent her/him from doing other things during her/his activity of surveilling the child.
  • the surveillance system can also be used for other applica- tions, such as monitoring the distance of elderly or mentally disabled people outside specialized homes or clinics, of a team or group member (outdoor sports and leisure activities) , a pet or the like.
  • said monitoring device is incorporated nto a mobile phone apparatus such as e.g. a GSM cellular phone.
  • a mobile phone apparatus such as e.g. a GSM cellular phone.
  • the surveillance system of the invention is especially comfortable for users: mobile phones are very common by now, thus it is not unusual that a person owns a private mobile phone and permanently has this phone with her. This means that when whishmg to use the surveillance system the person does not have to take an additional, bulky device with her, but she can ust use a supplementary option of her mobile phone, which she has with her anyway .
  • the presence surveillance system comprises on the one hand an R.F. transmitter emitting R.F. signals and being attacheable to a mobile object.
  • an electronic monitoring device comprising a receiver section being adapted to said R.F. transmitter.
  • Said receiver section receives R.F. signals emitted by the R.F. 5 . transmitter and provides a corresponding signal to a distance measuring section also provided m the monitoring device.
  • the distance measuring section determines from the received actual R.F. signal more or less permanently at successive time points the corresponding momentary actual distance of the R.F. trans- 0 mitter with respect to the monitoring device and outputs a corresponding distance output signal to a microprocessor section provided m the monitoring device.
  • Said microprocessoi section preferably compares the value of said distance output signal to a threshold value corresponding to a predetermined threshold 5 distance, which should not be exceeded by the mobile object, i.e. for example by the child.
  • the threshold value is for example stored m a memory of the monitoring device being provided therein. If now the value of the distance output signal exceeds said threshold value, an alarm section provided m the monito- 0 ring device generates an alarm.
  • the aforementioned microprocessor further controls the receiver section, the measuring section and the alarm section.
  • the R.F. i.e. the Radio Frequency spectral range has been chosen, as by using this spectral range transmission with little 5 distortion or interference can be obtained, even with the presence of objects such as walls, doors and vegetation m the transmission path of R.F. signals between the R.F. transmitter and the monitoring device.
  • the mobile phone apparatus of the invention comprises a dice comprising a CPU, with a transceiver, an alarm unit disposing of one or more alarms such as audible, voice and vibrational alarms, a keyboard and a display being connected to the CPU.
  • the microprocessor section of the monitoring device is integrated into the dice of the mobile phone apparatus, the monitoring device is operatively connected to and thus may be operated via the keyboard and the display of the mobile phone apparatus.
  • the actual distances are recallable into the display of the mobile phone apparatus by means of the keyboard thereof.
  • the mobile phone apparatus disposes of a menu the aforementioned actions of operating the monitoring device and of recalling the actual distances into the display of the mobile phone apparatus may also be done via said menu.
  • the monitoring device is provided with a separate alarm section for generating specific alarms
  • the alarm section of the monitoring device is preferably integrated into the alarm unit of the mobile phone apparatus, and optionally disposes of specific alarms for the electronic surveillance system, which are different from the con- ventional alarms of the mobile phone.
  • the actual distance between the R.F. transmitter and the monitoring device may be measured via the signal amplitude of the R.F. signal received by the receiver section of the monitoring device.
  • This method has the disadvantage that, even though an appropriate spectral range has been chosen, objects and obstacles m the transmission path of the R.F. signal can distort the R.F. signal, such that the actual distance is determined incorrectly. Therefore, for measuring the actual distance be- tween the R.F. transmitter and the monitoring device there is preferably provided a pulsed operation mode. In this mode the R.F. transmitter emits as R.F. signals a series of successive R.F. pulses at a corresponding series of successive time points of emission.
  • At least one of the microprocessor section and the receiver section of the monitoring device is synchronized to these time points of emission of said R.F. pulses.
  • the R.F. transmitter and the monitoring device comprise each a clock, and the two clocks run at the same speed and emit their respective clock pulses at the same time point or alternatively at two different time points having a specified fixed time distance with respect to each other.
  • the distance measuring section determines the propagation time period of each of the R.F. pulses proceeding between the R.F. transmitter and the monito- ring device. From this propagation time period the actual distance between the R.F. transmitter and the monitoring device is determined.
  • the distance measuring section generates a distance output signal corresponding to the propagation time period and thus to the actual distance measured before and provides said distance output signal to the display of the mobile phone apparatus, where the distance output signal is displayed m a form such as "DISTANCE: m" .
  • said distance output signal is displayed via a bar graph.
  • the pulsed operation mode is preferably used according to the invention, it would be possible instead that there is provided a monitor transmitter m the monitoring device which is designed such that it emits a switch-on impulse to the mo- bile object.
  • the switch-on pulse may be emitted when a key of the mobile phone or a button is depressed.
  • the mobile object comprises a transceiver comprising, besides the R.F. transmitter, an object receiver for receiving the switch-on impulse from the monitor transmitter.
  • the transceiver is designed such that receipt of the switch-on impulse switches the R.F. transmitter of the mobile object on and initiates the emission of one or more R.F. signals by the R.F. transmitter.
  • the switch-on impulse from the monitor transmitter initiates the emission of the first pulse m pulsed operation mode and the a distance measurement m pulsed operation mode.
  • the direction of the location of the R.F. transmitter with respect to the location of the mo- mtormg device is detected via determination of the polarization of the R.F. signals.
  • the monitoring device for this purpose further comprises a direction detector circuit.
  • the user e.g. executes a rotation around the vertical axis of his upright body by an angle of 360 de- grees . When doing so he also rotates the monitoring device, i.e. the mobile phone apparatus.
  • the receiver signal is e.g. a maximum or e.g.
  • the alarm section of the monitoring device generates an alarm.
  • the alarm can be an alarm of the mobile phone ap- paratus or alternatively a separate audible or visible signal such as a beep or an LED.
  • the display indicates that the direction has been found.
  • the direction of the location of the R.F. transmitter with respect to the location of the monitoring device can alternatively be detected via the signal amplitude of the R.F. signal. But this latter method has the disadvantage that objects or obstacles m the transmission path of the R.F. signals possibly distort the transmission of the R.F. signals, which makes it difficult to search and find the direction.
  • the predetermined threshold distance is presettable via the keyboard and preferably under support of the display of the mobile phone apparatus or, if available, via the menu of the latter.
  • This setting of the thresh- old distance can be such that the threshold distance is a permanent preset value.
  • the threshold distance is set- table and changeable by the user of the surveillance system as often as she/he wants, wherein the value of the threshold distance is freely adjustable to be a value not greater than the value of the predetermined distance range of e.g. 50 metres.
  • the monitoring device may even be settable to a plurality of threshold values to respond to a plurality of additional different threshold distances, and the alarm section of the monitoring device generates an alarm each time the value of the distance output signal exceeds one out of the plurality of corresponding additional different threshold values.
  • additional different threshold values are preferably settable, ust like the first threshold value. They may be presettable (once) by the manufacturer, but they are preferably settable by the user as often as she/he wants, with the threshold values being freely adjustable m the same way as for the abovemen- t oned single threshold value. Further, preferably different alarms may be available for the different threshold values.
  • a vibrational and/or a visual alarm is generated for all but the largest threshold values, and a beep and optionally a visual alarm is generated for the largest threshold value.
  • a pulsed beep is generated for all but the largest threshold values, wherein the pulse repetition rate may be related, e.g. directly proportional, to the respective threshold value, and a permanent beep is generated for the largest threshold value.
  • beeps of different frequencies or of different sound volumes are generated for the different threshold values, or the like.
  • some other combination of alarms out of the available alarms - comprising the separate ones and the ones of the mobile phone - may be provided.
  • the R.F. transmitter is preferably hermetically sealed into a waterproof casing.
  • the R.F. transmitter is further incorporated into a bracelet with an adjustable strap, such that the bracelet can be attached to a wrist, arm, ankle, leg, the upper part of the body, the neck or the like of a person.
  • the R.F. transmitter may alternatively be incorporated into a belt, a pendant to be worn on a strap or the like around the neck or the like, or the like.
  • the presence surveillance system of the invention preferably further disposes of a standby mode.
  • the R.F. transmitter emits R.F. signals
  • the receiver of the monitoring device receives the R.F. signals
  • the distance measuring section determines the distance between the R.F. transmitter and the monitoring device and pro- vides a distance output signal to the microprocessor section of the monitoring device.
  • the microprocessor section comprises a comparing section being designed such that it then compares the value of the distance output signal to a or, if several threshold values are available, to the several different threshold value/s.
  • the distance output signal When the value of the distance output signal exceeds the or any out of the several different threshold value/s, respectively, an alarm is released, and alternatively also the distance output signal is provided to the display of the mobile phone, such that the distance is displayed on the display of the mobile phone. If a direction detector cercuit is available, as there is m the preferably, upon exceeding of a threshold distance also a direction output signal is provided to the display or to the alarm unit or to both.
  • the distance output signal is permanently provided to the display of the mobile phone for being displayed there. I.e. the distance output signal is provided to the display for being displayed there also m that case, when no predetermined threshold value is exceeded.
  • m standby mode the user is contacted by the mom- to ⁇ ng device only m that case, when a predetermined threshold value is exceeded. In that case, when a predetermined threshold value is exceeded, at least an alarm is raised.
  • the system is switched to normal operation mode as well. In normal operation mode distance and, if a direction detection circuit is available, direction of the R.F. tranmitter with respect to the monitoring device are permanently indicated, wether the distance exceeds a threshold distance or not; when a threshold distance is exceeded, an alarm is raised.
  • a predetermined threshold distance is exceeded while the mobile phone apparatus is m use m conventional telephone mode, e.g. while the user is making or receiving a telephone call or while the user is setting the menu or while she/he is checking a mail box of the mobile phone apparatus, if such is available, or the like, at least an alarm is raised.
  • the surveillance system is m addition automatically switched to normal operation mode, i.e. the distance output signal and optionally the direction output signal is/are provided to the display to be indicated there. Neither said raising of an alarm nor said switching to normal operation mode, when a predetermined threshold distance is exceeded, interrupts the activity of the conventional telephone mode momentarily m use. I.e., for example a telephone conversation is not interrupted, when a threshold distance is exceeded.
  • the incorporated monitoring device of the invention does not alter the conventional functions of the mobile phone apparatus .
  • the monitoring device of the invention is preferably incorporated into a cellular mobile phone apparatus, nevertheless it may alternatively be incorporated nto the cordless mobile phone apparatus of a conventional cordless phone.
  • Fig. 1 shows a bracelet A with an incorporated R.F. transmitter
  • Fig. 2 shows a monitoring device E according to the preferred embodiment of the invention being, according to the invention, incorporated into an mobile phone apparatus APP and a microprocessor section P according to the preferred embodiment of the invention.
  • Fig. 3 shows an R.F. transmitter C according to the preferred embodiment of the invention.
  • Fig. 4 shows a monitoring device E according to the preferred embodiment of the invention.
  • Fig. 5 shows part of a monitoring device E according to another embodiment of the invention.
  • the R.F. transmitter C according to the preferred embodiment of the invention is preferably incorporated into a bracelet A, as shown m fig. 1.
  • a monitoring device E according to a pre- ferred embodiment of the invention is incorporated into a mobile phone apparatus (APP) .
  • the mobile phone apparatus according to the preferred embodiment of the invention comprises an antenna AN, a display DI , a keyboard KB, and a microprocessor section P, here for clarity shown outside the mobile phone apparatus, but according to the invention being incorporated into the mobile phone apparatus.
  • the R.F. transmitter C is incorporated into a bracelet A and comprises an antenna B and a lithium cell D.
  • the antenna B is a double line antenna.
  • the encoding is 12 bit and programmable via a switch (not shown) .
  • a PP3 battery with an output voltage of 9 Volts is used for alimentation a PP3 battery with an output voltage of 9 Volts is used.
  • the fre- quency of the R.F. transmitter C is 433 MHz.
  • the cycle of emission is 1 emission per second, wherein the emission is optionally visualized via an LED.
  • the range of emission of the R.F. transmitter C is typically 20 metres.
  • the R.F. transmitter C is sealed into a casing made of ABS and having the size of a typi- cal sports wristwatch. A membrane being tightly connected with the casing guarantees the hermetical disconnection of the R.F. transmitter C from the environmental atmosphere.
  • An adjustable strap allows the adjustment of the bracelet to an arm, wrist, upper part of the
  • the monitoring device E comprises an antenna F, an alimentation means G, a receiver section H with a direction detector circuit, a distance measuring section I, a threshold adjustment section J for setting the predetermined threshold value or values, a switching means K for switching the monitoring device E between normal operation mode and standby mode, an alarm 1 L and a display 1 M, each of the two latter being related to the measurement of the distance between the R.F. transmitter C and the monitoring device E, an alarm 2 N and a display 2 O, each of the two latter being related to the determination of the direction of the R.F. transmitter C with respect to the monitoring device E, and a microprocessor section P .
  • the antenna F of the monitoring device E is a SMA-double line joint and at the same time a quarter-wave antenna.
  • the alimentation G is identical with the battery of the mobile phone apparatus.
  • the level of the received R.F. signal is indicated digitally via a bar graph.
  • the receiver section H operates at a frequency of 433 MHz.
  • the encoding is 12 bit and programmable via a switch (not shown) .
  • the microprocessor section P of the monitoring device E consists of a section of a silicon dice comprising a printed circuit.
  • the silicon dice of the preferred embodiment is identical with the dice of the mobile phone apparatus, which dice is mo- dified by the microprocessor section P, the dice of the mobile phone apparatus comprising registers, an arithmetic-logic unit ALU, a control unit, a bus, data input and output interfaces and a line amplifier and disposing of bus addresses indicating the location of data to be read from or to be written into a central memory.
  • a microprogram is integrated into the micro- processor section P.
  • the microprocessor section P calculates m real time the propagation time period of R.F. signals from the R.F. transmitter C to the mobile phone apparatus. This calculation allows the indication of the exact distance of the location of the R.F. transmitter C with respect to the location of the mobile phone apparatus on the display DI of the mobile phone apparatus.
  • the detailed functioning of the monitoring device E according to the preferred embodiment of the invention m its function of detecting an actual distance being larger than a threshold distance is the following.
  • the R.F. receiver H receives an R.F. signal and transmits the R.F. signal to the distance measuring section I.
  • the threshold adjustment section J releases via the distance measuring section I the activation of the alarm 1 L and the display 1 M.
  • the alarm 1 L releases the alarm 2 N and the display 2 O.
  • the alarm 2 N and the display 2 0 are repeated until manual extinction.
  • the alarm 1 L and the display 1 M are repeated until the threshold distance J is not exceeded any more (optional manual extinction) .
  • the surveillance system of the preferred embodiment of the invention disposes of four threshold distances, which are set- table m the threshold adjustment section J and via the menu or generally via the keyboard KB and the display DI of the mobile phone apparatus to be e.g. 5, 10, 15 and 20 metres.
  • an alarm 1 L is released when one out of the four predetermined threshold distances is exceeded.
  • a beep with a duration of 0.5 seconds is emitted every 4 seconds, when exceeding 10 metres said beep is emitted every 2 seconds, when exceeding 15 metres, said beep is emitted every one second, and finally when 20 metres are exceeded, a permanent beep is emitted, and the system is switched to normal operation mode.
  • the alarm 1 L triggers the display 1 M, which m turn releases the alarm 2 N and the display 2 O.
  • Said beep is preferably an audible alarm of the mobile phone.
  • the receiver H and/or the distance measuring section I activate/s the display 1 M, which m turn releases the alarm 2 N and the display 2 0.
  • the alarm 2 N and the display 2 0 are repeated until manual extinction.
  • the display 1 N can e.g. be a text such as "DISTANCE :....m” displayed on the display of the mobile telephone.
  • the display 2 0 can be a text such as "Direction OK” , when the direction of the location of the R.F. transmitter C is found, and a text such as "Searching Transmitter” otherwise.
  • the display of the mobile telephone e.g. alternately displays the texts of display 1 N and display 2 O, each of the texts staying on the display for e.g. one second, or, according to the choice by the user, the display 1 N permanently stays visible on the display, until manual extinction.
  • the predetermined distance range is typically 100 metres. According to still another embodiment said range is a few or several 10 metres or a plurality of 10 metres.
  • the monitoring device of the surveillance system is preferably incorporated into a cellu- lar mobile phone apparatus, but it may alternatively also be incorporated into a conventional cordless phone with a cordless mobile phone apparatus (APP) as shown m fig. 2 and a cordless phone base station (BST) as shown m fig. 5.
  • APP cordless mobile phone apparatus
  • BST cordless phone base station

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  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Alarm Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Glass Compositions (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

La présente invention concerne un système de surveillance de présence destiné à surveiller la présence d'un objet mobile dans un rayon prédéterminé allant jusqu'à plusieurs dizaines de mètres. Ce système comprend un émetteur HF émettant des signaux HF, que l'on peut fixer sur ledit objet mobile, et un dispositif de surveillance électronique destiné à recevoir et traiter ces signaux HF de façon à déterminer les distances réelles instantanées de cet émetteur HF par rapport au dispositif de surveillance. Ce dispositif de surveillance comprend une partie récepteur adaptée pour correspondre avec cet émetteur HF. Une partie mesure de distance détermine la distance réelle et produit un signal de distance de sortie correspondant à la distance réelle, cette partie étant connectée à la partie réception. Une partie microprocesseur contrôle la partie récepteur et la partie mesure. Le dispositif de surveillance est incorporé dans un téléphone mobile tel qu'un téléphone cellulaire mobile GSM comprenant un dé qui inclut une UC, avec un émetteur récepteur, un clavier et un afficheur connectés à cette UC. La partie microprocesseur au moins du dispositif de surveillance est intégrée dans l'UC du téléphone mobile et ce dispositif de surveillance est connecté de façon opérationnelle au clavier et à l'afficheur de ce téléphone mobile.
PCT/EP1999/006950 1999-09-20 1999-09-20 Surveillance de presence electronique WO2001022379A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/EP1999/006950 WO2001022379A1 (fr) 1999-09-20 1999-09-20 Surveillance de presence electronique
EP99947388A EP1221152B1 (fr) 1999-09-20 1999-09-20 Surveillance de presence electronique
DE69907760T DE69907760D1 (de) 1999-09-20 1999-09-20 Elektronische anwesenheitsüberwachung
AT99947388T ATE239960T1 (de) 1999-09-20 1999-09-20 Elektronische anwesenheitsüberwachung
AU60857/99A AU6085799A (en) 1999-09-20 1999-09-20 Electronic presence surveillance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/006950 WO2001022379A1 (fr) 1999-09-20 1999-09-20 Surveillance de presence electronique

Publications (1)

Publication Number Publication Date
WO2001022379A1 true WO2001022379A1 (fr) 2001-03-29

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ID=8167441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/006950 WO2001022379A1 (fr) 1999-09-20 1999-09-20 Surveillance de presence electronique

Country Status (5)

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EP (1) EP1221152B1 (fr)
AT (1) ATE239960T1 (fr)
AU (1) AU6085799A (fr)
DE (1) DE69907760D1 (fr)
WO (1) WO2001022379A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2368704A (en) * 2000-08-24 2002-05-08 Robert Thomas Kingsbury Wireless child distance monitoring alarm system with anti-tamper features
EP1362624A1 (fr) * 2002-05-03 2003-11-19 Character Games Limited Appareil permettant de creer un illusion
WO2005004413A1 (fr) * 2003-07-02 2005-01-13 Disetronic Licensing Ag Systeme et procede de controle de communication
GB2518404A (en) * 2013-09-20 2015-03-25 Jason Williams Device to prevent loss of belongings
US10909836B2 (en) * 2019-01-30 2021-02-02 Center For Integrated Smart Sensors Foundation Device for preventing mobile phone loss through reduction of false alarms and method for providing alarms for mobile phone loss prevention

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289163A (en) * 1992-09-16 1994-02-22 Perez Carla D Child position monitoring and locating device
EP0732820A2 (fr) * 1995-03-16 1996-09-18 Siemens Aktiengesellschaft Système de communication
US5661460A (en) * 1994-12-13 1997-08-26 Secure Technologies, Inc. Distance determination and alarm system
FR2768249A1 (fr) * 1997-09-08 1999-03-12 Ralph Feingold Dispositif de recherche et de surveillance
EP0969435A2 (fr) * 1998-06-23 2000-01-05 Raj Kumar Dhameja Système de suivi pour enfants

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289163A (en) * 1992-09-16 1994-02-22 Perez Carla D Child position monitoring and locating device
US5661460A (en) * 1994-12-13 1997-08-26 Secure Technologies, Inc. Distance determination and alarm system
EP0732820A2 (fr) * 1995-03-16 1996-09-18 Siemens Aktiengesellschaft Système de communication
FR2768249A1 (fr) * 1997-09-08 1999-03-12 Ralph Feingold Dispositif de recherche et de surveillance
EP0969435A2 (fr) * 1998-06-23 2000-01-05 Raj Kumar Dhameja Système de suivi pour enfants

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2368704A (en) * 2000-08-24 2002-05-08 Robert Thomas Kingsbury Wireless child distance monitoring alarm system with anti-tamper features
EP1362624A1 (fr) * 2002-05-03 2003-11-19 Character Games Limited Appareil permettant de creer un illusion
WO2005004413A1 (fr) * 2003-07-02 2005-01-13 Disetronic Licensing Ag Systeme et procede de controle de communication
US7650146B2 (en) 2003-07-02 2010-01-19 Disetronic Licensing Ag System and method for monitoring communication
GB2518404A (en) * 2013-09-20 2015-03-25 Jason Williams Device to prevent loss of belongings
US10909836B2 (en) * 2019-01-30 2021-02-02 Center For Integrated Smart Sensors Foundation Device for preventing mobile phone loss through reduction of false alarms and method for providing alarms for mobile phone loss prevention

Also Published As

Publication number Publication date
EP1221152B1 (fr) 2003-05-07
DE69907760D1 (de) 2003-06-12
ATE239960T1 (de) 2003-05-15
AU6085799A (en) 2001-04-24
EP1221152A1 (fr) 2002-07-10

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