EP0312431A1 - Remote goods and/or persons supervising method - Google Patents

Remote goods and/or persons supervising method Download PDF

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Publication number
EP0312431A1
EP0312431A1 EP19880402547 EP88402547A EP0312431A1 EP 0312431 A1 EP0312431 A1 EP 0312431A1 EP 19880402547 EP19880402547 EP 19880402547 EP 88402547 A EP88402547 A EP 88402547A EP 0312431 A1 EP0312431 A1 EP 0312431A1
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EP
European Patent Office
Prior art keywords
central station
transmitting
alarm
aforementioned
information
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EP19880402547
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German (de)
French (fr)
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EP0312431B1 (en
Inventor
Michel Baudoin
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MICHEL BAUDOIN TE NOTRE DAME DE COURSON, FRANKRIJK
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C M S -CENTRAL MULTI SERVICES
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    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

Definitions

  • the present invention relates to a method of remote monitoring in particular of goods and / or people for the remote detection of events of all kinds possibly requiring rapid intervention at the places where the events took place.
  • the object of the present invention is to eliminate the above drawback by proposing a method of remote monitoring, in particular of goods and / or persons, for the remote detection, by a common central station, of alarm information originating from '' at least two transmitting devices with associated sensors and located in geographically distinct places and characterized in that it consists in transmitting from each transmitting device at least one alarm information at a randomly determined instant and specific to each transmitting device when one of the sensors associated with said transmitting device has detected a significant event of an alarm.
  • the method consists in transmitting a first alarm information item within a maximum authorized time interval; triggering, at the end of said interval, a time delay of a determined value; to calculate randomly, from the start of the time delay, a time value in relation to parameters for example specific to each transmitting device, such as the geographical area where the transmitting device is located, the number identifying the owner of said transmitting device and / or the identification number of the sensor requested; modifying the value of the time delay as a function of the calculated time value; and emitting the aforementioned alarm information at the aforementioned instant in relation to the modified value of the time delay.
  • the method consists in adding or subtracting from the value of the above-mentioned time delay the calculated time value and in issuing the alarm information at the aforementioned instant equal to the sum of the value the time delay and the calculated time value or the difference between the time value and the calculated time value.
  • each alarm information from each transmitting device is subdivided into several pieces of information sent to the central station respectively on different channels or different frequencies, chosen according to a randomly established composition rule.
  • the method consists, as soon as a significant event of an alarm is detected at at least one of the transmitting devices, to transmit from the transmitting device to the central station a radio signal carrying at least minus coded information relating to the above-mentioned composition rule of the transmission channels or frequencies to and memorize it at the central station.
  • the aforementioned radio signal also carries coded information relating to the type of coding of the channels or frequencies and stored in the central station, said signal being transmitted on a channel or a frequency also chosen randomly.
  • each transmitter device is associated with a receiver device and the central station further comprises a transmitter device transmitting to the transmitter-receiver devices an acknowledgment signal of reception of the signal carrying at least 1 coded information relating to the aforementioned rule and setting of the receiving device of the central station on the chosen channel or transmission frequency, the acknowledgment and setting signal containing an identification code of the channel or the frequency used and a code relating to the quality of reception observed at the central station.
  • the remote monitoring device shown in Figure 1 comprises a transmitter device 1 arranged to transmit a radio alarm signal to the receiving device of the central station.
  • the remote monitoring device in fact comprises a plurality of transmitter devices 1 located in geographically distinct places to be monitored by the common central station such as a police station.
  • the transmitter device 1 comprises several inputs 10, for example 8 in number respectively connected to sensors triggering the emission of the radio alarm signal in the event of, for example, a break-in, a processing device 11, preferably with microprocessor, signals received at the inputs 10, a modulation device 12 intended to modulate one or more carrier frequencies by the low frequency alarm information signals coming from the processing device 11 and a filtering device 13 connected at the output of the modulation device 12
  • the analog signals applied to the inputs 10 are digitally converted by an analog-digital conversion device 14 connected to the processing device 11.
  • the 8 inputs 10 are at a low level (O V) and the detection of a break-in by one of the sensors results in a high level at the corresponding input terminal.
  • the digital signal from the analog-digital conversion device 14 is transmitted to the processing device 11 which is adapted to produce the alarm information composed for example of eight binary signals, each of 4 bits, four of them relating to the identification number of the person owning the transmitter device 1, two others to the geographical area where the transmitter device is located and the last two to the identification number of the sensor requested.
  • FIG. 2 represents the general flow diagram of the operating program of the processing device 11 for the emission of radio alarm signals and which, insofar as it is sufficiently self-explanatory, will be described quickly.
  • the device 1 When at least one of the sensors associated with the sending device 1 detects a particular event such as a break-in, the device 1 is powered up and emits a first radio alarm signal in a maximum time interval authorized by the PTT fixed at 20 seconds.
  • This signal consists of a carrier of a predetermined frequency modulated by the coded information which advantageously comprises three successive identical codes, each relating to the aforementioned parameters coded in the form of the eight binary signs of four bits.
  • This first signal will be transmitted on a channel defined by the filtering device 13.
  • the modulation device 12 At the end of the maximum time interval, the modulation device 12 is put out of service and a time delay of five minutes (radio silence) imposed by the PTT is triggered.
  • two other radio alarm signals identical to the first signal will be sent to the central station under the same conditions as above.
  • the processing device 11 is adapted to randomly calculate a time value in relation to the parameters specific to said transmitting devices 1 which are the geographical area where the transmitting device is located, the number identifying the person owning the device and / or the identification number of the sensor requested.
  • a time value can be calculated from other parameters such as for example the date and time of detection of a break-in.
  • the processing device 11 modifies the value of the time delay, for example by adding or subtracting from it the calculated time value. This new time value thus obtained will be the instant of emission of the second radio alarm signal.
  • the instant of emission of the third radio alarm signal will be determined randomly as a function of a new value of the calculated time modifying the value of the time delay.
  • Each radio alarm signal from a transmitting device is received at the receiving device of the central station, filtered and demodulated in the filtering and demodulating device 20 in order to transmit a low frequency analog signal of the alarm information.
  • an analog-digital transcoding device 21 the digital outputs of which are connected to a processing device 22 preferably with a microprocessor.
  • the processing device 22 is connected to a device 23 for displaying information relating to the geographical area where the alarm was triggered, to the identification of the person owning the sending device and / or to the identification of the sensor requested, this information can also be printed on a printer 24 connected to the processing device 22. This information can also be stored in a memory device 25 and subsequently displayed on the display device 23.
  • each coded alarm information item of the sending device 1 is subdivided by the processing device 11 into several parts or sections of information sent to the central station respectively on different sending channels. or different transmission carrier frequencies, chosen according to a randomly established composition rule specific to the transmitter device 1.
  • the processing device 11 is adapted to split the coded alarm information into four parts of information transmitted respectively on four channels n1-4 or frequencies f1-f4 chosen at random, the composition rule can be based for example on the date and time of detection of the event such as a break-in, by one of the sensors associated with the emitting device 1.
  • the processing device 11 can by example choose the first two binary signals relating to the identification of the person owning the transmitter device 1 so that they are transmitted on a first channel n1 or frequency f1, the other two binary signals relating to this identification to transmit them on the transmission channel n4 or the transmission frequency f4, the two binary signals relating to the geographical area where the transmitting device 1 is located to transmit them on the transmission channel n3 or the transmission frequency f3 and the last two binary signals relating to the identification of the sensor requested to transmit them on the transmission channel n2 or the transmission frequency f2.
  • the processing device 11 is connected to the modulation device 12 for choosing according to the randomly established rule the carrier frequencies for transmitting the alarm information and to the filtering device 13 for choosing according to this same rule the alarm information transmission channels.
  • the alarm information is transmitted to the processing device 22 by the transcoding device 21, the processing device 22 decoding and reconstructing the information of alarm which is displayed on the display device 23 and / or printed on the printer 24 and / or stored in the memory device 25.
  • the eight binary signals constituting the alarm information can be chosen by the processing device 11 to the sending device 1 in any order, different from that mentioned above.
  • the processing device 22 is adapted to reconstruct the alarm information even if at least one of the binary signals is missing as could be the case during jamming, the other three pieces of information received at the central station being sufficient to allow such a reconstruction.
  • the information signal modulating the FM carrier may also include a code relating to the type or rule of coding the channels n1-n4, for example a cyclic coding.
  • the receiving device 2 which is in broadband reception, detects the emission of the closely modulated FM carrier signal and an electronic device forming, for example, part of the device 20 decreases the bandwidth of a broadband reception filter of the device 20 until precisely detecting the aforementioned channel used.
  • the FM carrier signal is then demodulated so as to transmit to the processing device 2 the information relating to the composition rule of the transmission channels n1-n4 and to the coding rule for these channels, this information being stored in the memory device. 25.
  • the sending device 1 and the receiving device 2 of the central station are prepared to communicate on the four different channels or four different frequencies, the sending of the alarm signals from the sending device 1 being carried out as described above.
  • the composition rule and the processing device 22 of the receiving device 2 is adapted to calibrate the filtering device 20 on each channel or transmission frequency chosen randomly from the coded information relating to the composition rule to find the channels n1-n4 or the frequencies f1-f2.
  • each sending device 1 can be associated with a receiving device and the central station can also include a sending device.
  • This structure makes it possible to ensure the smooth running of the information exchanges between the sending device 1 and the receiving device 2 of the central station during the learning phase.
  • the transceiver device 2 of the central station switches to transmission mode to transmit from the processing device 22, using the device receiver associated with the transmitting device 1 a signal of acknowledgment of reception of the FM carrier signal and setting of the receiving device 2 on the channel or the frequency used once the transmission of the FM carrier signal from the transmitting device.
  • the acknowledgment and calibration signal will contain in coded form the identification number of the channel used as well as the quality of reception noted.
  • the transceiver device 2 will then return to reception mode.
  • the device transceiver 1 After receiving the acknowledgment and timing signal from the central station, the device transceiver 1, which has returned to transmission mode, retransmits an FM carrier signal containing in coded form the acknowledgment and calibration signal, the composition rule for finding transmission channels n1 to n4 or frequencies f1 at f4, the coding rule used for these channels or frequencies and, where appropriate, an emergency code in the event that an event such as a break-in is detected by one of the sensors of the transmitting device 1 during this phase learning.
  • This second FM carrier signal modulated by this coded information is received by the transceiver device 2 which demodulates it in order to extract the information which is compared with that which had been previously transmitted, so as to ascertain its identity.
  • the significant emergency code for a break-in is stored in the memory device 25 for confirmation during the communication between the sending device 1 and the receiving device 2 on the four channels or four transmission frequencies chosen at random.
  • the emitting device 1 is ready to emit alarm signals on the randomly chosen channels or frequencies upon detection of a significant alarm event by one of the associated sensors in the manner already explained previously.
  • the preparation phase 2 is initialized as soon as a significant alarm event is detected by one of the sensors associated with the transmitter device 1 with the condition that the time taken to transmit the modulated FM carrier signal including in particular the coded information representative of the composition rule and to possibly re-issue in the case of two-way communication directional between the receiving device associated with the sending device 1 and the central station is within the maximum authorized time interval.
  • the processing device 22 is adapted to erase the information relating to the composition rule and to the type of coding of the transmission channels or frequencies stored in the memory device 25.
  • the present invention can also be applied to the medical surveillance of persons, to the transmission of personal, industrial or military information.

Abstract

Remote-supervising method for remote detection by a common central station following the alarm signal. The method is characterised in that it consists in transmitting from each transmitter device (1) to the central station (2) at least one radio alarm signal at a randomly determined instant specific to each transmitter device (1) when one of the sensors (10) associated with the transmitter device (1) has detected an event signifying an alarm. The present invention finds application in particular for the protection of goods and/or persons. <IMAGE>

Description

La présente invention concerne un procédé de télésurveillance notamment de biens et/ou de personnes pour la détection à distance d'événements de toutes sortes nécessitant éventuellement une intervention rapide aux endroits où se sont déroulés les événements.The present invention relates to a method of remote monitoring in particular of goods and / or people for the remote detection of events of all kinds possibly requiring rapid intervention at the places where the events took place.

On connaît des procédés de télésurveillance assurant la protection de personnes contre des aggressions et de biens contre des cambriolages, du type consistant à émettre des signaux d'alarme provenant d'un certain nombre de dispositifs émetteurs situés en des lieux géographiquement distincts et reçus à un poste central commun tel qu'un poste de police le plus proche du ou des lieux d'incidents.There are known methods of remote monitoring ensuring the protection of persons against attacks and of property against burglaries, of the type consisting in transmitting alarm signals coming from a certain number of transmitting devices located in geographically distinct places and received at a joint central station such as the nearest police station to the incident site (s).

Cependant, compte tenu de la présence d'un grand nombre de dispositifs émetteurs situés respectivement en des lieux géographiquement différents surveillés par le poste central commun, plusieurs signaux d'alarmes provenant de certains de ces dispositifs émetteurs peuvent être reçus simultanément au poste central, occasionnant ainsi un problème de collision de ces signaux au poste central.However, given the presence of a large number of transmitting devices located respectively in geographically different places monitored by the common central station, several alarm signals originating from some of these transmitting devices can be received simultaneously at the central station, causing thus a problem of collision of these signals at the central station.

La présente invention a pour but d'éliminer l'inconvénient ci-dessus en proposant un procédé de télésurveillance, notamment de biens et/ou de personnes pour la détection à distance, par un poste central commun, d'informations d'alarme provenant d'au moins deux dispositifs émetteurs à capteurs associés et situés en des lieux géographiquement distincts et caractérisé en ce que qu'il consiste à émettre de chaque dispositif émetteur au moins une information d'alarme à un instant déterminé aléatoirement et propre à chaque dispositif émetteur lorsque l'un des capteurs associés audit dispositif émetteur a détecté un événement significatif d'une alarme.The object of the present invention is to eliminate the above drawback by proposing a method of remote monitoring, in particular of goods and / or persons, for the remote detection, by a common central station, of alarm information originating from '' at least two transmitting devices with associated sensors and located in geographically distinct places and characterized in that it consists in transmitting from each transmitting device at least one alarm information at a randomly determined instant and specific to each transmitting device when one of the sensors associated with said transmitting device has detected a significant event of an alarm.

Selon une caractéristique de l'invention, le procédé consite à émettre une premiere information d'alarme dans un intervalle de temps maximum autorisé ; à déclencher, à la fin dudit intervalle, une temporisation d'une valeur déterminée ; à calculer aléatoirement, dès le début de la temporisation, une valeur de temps en relation avec des paramétres par exemple propres à chaque dispositif émetteur, tels que la zone géographique où se trouve le dispositif émetteur, le numéro identifiant la personne propiétaire dudit dispositif émetteur et/ou le numéro d'identification du capteur sollicité ; à modifier la valeur de la temporisation en fonction de la valeur de temps calculée ; et à émettre l'information d'alarme précitée à l'instant précité en relation avec la valeur modifiée de la temporisation.According to a characteristic of the invention, the method consists in transmitting a first alarm information item within a maximum authorized time interval; triggering, at the end of said interval, a time delay of a determined value; to calculate randomly, from the start of the time delay, a time value in relation to parameters for example specific to each transmitting device, such as the geographical area where the transmitting device is located, the number identifying the owner of said transmitting device and / or the identification number of the sensor requested; modifying the value of the time delay as a function of the calculated time value; and emitting the aforementioned alarm information at the aforementioned instant in relation to the modified value of the time delay.

Selon une autre caractéristique de l'invention, le procédé consiste à ajouter ou à retrancher à la valeur de la temporisation précitée la valeur de temps calculée et à émettre l'information d'alarme à l'instant précité égal à la somme de la valeur de la temporisation et de la valeur de temps calculée ou à la différence entre la valeur de la temporisation et la valeur de temps calculée.According to another characteristic of the invention, the method consists in adding or subtracting from the value of the above-mentioned time delay the calculated time value and in issuing the alarm information at the aforementioned instant equal to the sum of the value the time delay and the calculated time value or the difference between the time value and the calculated time value.

Par ailleurs, afin d'assurer au procédé de télésurveillance de l'invention un degré de sécurité suffisant pour qu'une personne non autorisée ne puisse pas avoir accès aux informations codées d'alarme et brouiller complétement celles-ci, chaque information d'alarme provenant de chaque dispositif émetteur est subdivisée en plusieurs parties d'information émises au poste central respectivement sur différents canaux ou différentes fréquences, choisis suivant un règle de composition établie aléatoirement.Furthermore, in order to ensure that the remote monitoring method of the invention has a sufficient degree of security so that an unauthorized person cannot have access to the coded alarm information and completely jam it, each alarm information from each transmitting device is subdivided into several pieces of information sent to the central station respectively on different channels or different frequencies, chosen according to a randomly established composition rule.

Selon une caractéristique de l'invention, le procédé consiste, dès la détection d'un événement significatif d'une alarme à au moins l'un des dispositifs émetteurs, à transmettre du dispositif émetteur vers le poste central un signal radioélectrique porteur d'au moins une information codée relative à la règle de composition précitée des canaux ou fréquences d'émission à et mémoriser celle-ci au poste central.According to a characteristic of the invention, the method consists, as soon as a significant event of an alarm is detected at at least one of the transmitting devices, to transmit from the transmitting device to the central station a radio signal carrying at least minus coded information relating to the above-mentioned composition rule of the transmission channels or frequencies to and memorize it at the central station.

Selon une autre caractéristique de l'invention, le signal radioélectrique précité est également porteur d'une information codée relative au type de codage des canaux ou fréquences et mémorisée au poste central, ledit signal étant émis sur un canal ou une fréquence également choisi aléatoirement.According to another characteristic of the invention, the aforementioned radio signal also carries coded information relating to the type of coding of the channels or frequencies and stored in the central station, said signal being transmitted on a channel or a frequency also chosen randomly.

Selon toujours une autre caractéristique de l'invention, à chaque dispositif émetteur est associé un dispositif récepteur et le poste central comprend de plus un dispositif émetteur transmettant aux dispositifs émetteur-récepteur un signal d'accusé de réception du signal porteur d'au moins l'information codée relative à la règle précitée et de calage du dispositif récepteur du poste central sur le canal ou la fréquence d'émission choisi, le signal d'accusé de réception et de calage contenant un code d'identification du canal ou de la fréquence utilisée et un code relatif à la qualité de réception constatée au poste central.Still according to another characteristic of the invention, each transmitter device is associated with a receiver device and the central station further comprises a transmitter device transmitting to the transmitter-receiver devices an acknowledgment signal of reception of the signal carrying at least 1 coded information relating to the aforementioned rule and setting of the receiving device of the central station on the chosen channel or transmission frequency, the acknowledgment and setting signal containing an identification code of the channel or the frequency used and a code relating to the quality of reception observed at the central station.

L'invention sera mieux comprise, et d'autres buts, caractéristique, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention, et dans lesquels :

  • - la figure 1 représente un dispositif de télésurveillance comprenant un dispositif émetteur de signaux d'alarme vers un disposif récepteur d'un poste central ; et
  • - la figure 2 représente un organigramme de fonctionnement du dispositif émetteur.
The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a embodiment of the invention, and in which:
  • - Figure 1 shows a remote monitoring device comprising a device transmitting alarm signals to a receiving device of a central station; and
  • - Figure 2 shows a flowchart of operation of the transmitter device.

L'invention va être décrite en référence à un dispositif de télésurveillance de biens contre les cambriolages, mais il est bien entendu que l'invention peut s'appliquer à un autre domaine différent comme il sera expliqué ultérieurement.The invention will be described with reference to a device for remote monitoring of property against burglaries, but it is understood that the invention can be applied to another different field as will be explained later.

Le dispositif de télésurveillance représenté à la figure 1 comprend un dispositif émetteur 1 agencé pour émettre un signal radioélectrique d'alarme vers le dispositif récepteur du poste central.The remote monitoring device shown in Figure 1 comprises a transmitter device 1 arranged to transmit a radio alarm signal to the receiving device of the central station.

Le dispositif de télésurveillance comprend en fait une pluralité de dispositif émetteurs 1 situés en des lieux géographiquement distincts à surveiller par le poste central commun tel qu'un poste de police.The remote monitoring device in fact comprises a plurality of transmitter devices 1 located in geographically distinct places to be monitored by the common central station such as a police station.

Le dispositif émetteur 1 comprend plusieurs entrées 10, par exemple au nombre de 8 reliées respectivement à des capteurs déclenchant l'émission du signal radioélectrique d'alarme en cas par exemple d'effraction, un dispositif de traitement 11, de préférence à microprocesseur, des signaux reçus aux entrées 10, un dispositif de modulation 12 destiné à moduler une ou des fréquences porteuses par les signaux basse fréquence d'informations d'alarme provenant du dispositif de traitement 11 et un dispositif de filtrage 13 relié en sortie du dispositif de modulation 12. Les signaux analogiques appliqués aux entrées 10 sont convertis numériquement par un dispositif de conversion analogique-numérique 14 relié au dispositif de traitement 11.The transmitter device 1 comprises several inputs 10, for example 8 in number respectively connected to sensors triggering the emission of the radio alarm signal in the event of, for example, a break-in, a processing device 11, preferably with microprocessor, signals received at the inputs 10, a modulation device 12 intended to modulate one or more carrier frequencies by the low frequency alarm information signals coming from the processing device 11 and a filtering device 13 connected at the output of the modulation device 12 The analog signals applied to the inputs 10 are digitally converted by an analog-digital conversion device 14 connected to the processing device 11.

A l'état de veille du dispositif émetteur 1, les 8 entrées 10 sont à un niveau bas (O V) et la détection d'une effraction par l'un des capteurs se traduit par un niveau haut à la borne d'entrée correspondante. Le signal numérique du dispositif de conversion analogique-numérique 14 est transmis au dispositif de traitement 11 qui est adapté pour produire l'information d'alarme composée par exemple de huit signaux binaires, chacun de 4 bits, quatre d'entre eux étant relatifs au numéro d'identification de la personne propriétaire du dispositif émetteur 1, deux autres à la zone géographique où se trouve le dispositif émetteur et les deux derniers au numéro d'identification du capteur sollicité.In the standby state of the transmitting device 1, the 8 inputs 10 are at a low level (O V) and the detection of a break-in by one of the sensors results in a high level at the corresponding input terminal. The digital signal from the analog-digital conversion device 14 is transmitted to the processing device 11 which is adapted to produce the alarm information composed for example of eight binary signals, each of 4 bits, four of them relating to the identification number of the person owning the transmitter device 1, two others to the geographical area where the transmitter device is located and the last two to the identification number of the sensor requested.

La figure 2 représente l'organigramme général du programme de fonctionnement du dispositif de traitement 11 pour l'émission de signaux radioélectriques d'alarme et qui, dans la mesure où il est suffisamment explicite de lui-même, sera décrit rapidement.FIG. 2 represents the general flow diagram of the operating program of the processing device 11 for the emission of radio alarm signals and which, insofar as it is sufficiently self-explanatory, will be described quickly.

Lors de la détection par au moins l'un des capteurs associés au dispositif émetteur 1 d'un événement particulier tel qu'une effraction, le dispositif 1 est mis sous tension et émet un premier signal radioé­lectrique d'alarme dans un intervalle de temps maximum autorisé par les PTT fixé à 20 secondes. Ce signal est constitué d'une porteuse d'une fréquence prédéterminée modulée par l'information codée qui comprend avantageusement trois codes identiques successifs, chacun relatif aux paramètres susmentionnés codés sous forme des huit signes binaires de quatre bits. Ce premier signal sera émis sur un canal défini par le dispositif de filtrage 13. A la fin de l'intervalle de temps maximum, le dispositif de modulation 12 est mis hors service et une temporisation de cinq minutes (silence radio) imposée par les PTT est déclenchée. Pour des raisons de sécurité, deux autres signaux radioélectriques d'alarme identiques au premier signal seront émis vers le poste central dans les mêmes conditions que ci-dessus.When at least one of the sensors associated with the sending device 1 detects a particular event such as a break-in, the device 1 is powered up and emits a first radio alarm signal in a maximum time interval authorized by the PTT fixed at 20 seconds. This signal consists of a carrier of a predetermined frequency modulated by the coded information which advantageously comprises three successive identical codes, each relating to the aforementioned parameters coded in the form of the eight binary signs of four bits. This first signal will be transmitted on a channel defined by the filtering device 13. At the end of the maximum time interval, the modulation device 12 is put out of service and a time delay of five minutes (radio silence) imposed by the PTT is triggered. For safety reasons, two other radio alarm signals identical to the first signal will be sent to the central station under the same conditions as above.

Selon l'invention, dès le déclenchement de la temporisation à la fin de l'intervalle de temps pendant lequel a été émis le premier signal radioélectrique d'alarme, le dispositif de traitement 11 est adapté pour calculer aléatoirement une valeur de temps en relation avec les paramètres propres auxdits dispositifs émetteurs 1 qui sont la zone géographique où se trouve le dispositif émetteur, le numéro identifiant la personne propriétaire du dispositif et/ou le numéro d'identification du capteur sollicité. Bien entendu, une telle valeur de temps peut être calculée à partir d'autres paramètres tels que par exemple la date et l'heure de détection d'une effraction. A partir de cette valeur de temps calculée, le dispositif de traitement 11 modifie la valeur de la temporisation par exemple en ajoutant ou en retranchant à cette dernière la valeur de temps calculée. Cette nouvelle valeur de temps ainsi obtenue sera l'instant d'émission du deuxième signal radioélectrique d'alarme. De même, l'instant d'émission du troisième signal radioélectrique d'alarme sera déterminé aléatoirement en fonction d'une nouvelle valeur du temps calculée modifiant la valeur de la temporisation.According to the invention, as soon as the timer is triggered at the end of the time interval during which the first radio alarm signal has been emitted, the processing device 11 is adapted to randomly calculate a time value in relation to the parameters specific to said transmitting devices 1 which are the geographical area where the transmitting device is located, the number identifying the person owning the device and / or the identification number of the sensor requested. Of course, such a time value can be calculated from other parameters such as for example the date and time of detection of a break-in. From this calculated time value, the processing device 11 modifies the value of the time delay, for example by adding or subtracting from it the calculated time value. This new time value thus obtained will be the instant of emission of the second radio alarm signal. Likewise, the instant of emission of the third radio alarm signal will be determined randomly as a function of a new value of the calculated time modifying the value of the time delay.

Dans la mesure où les signaux radioélectriques d'alarme de chaque dispositif émetteur 1 sont émis respectivement à des instants déterminés aléatoirement en fonction de paramétres propres aux dispositifs émetteurs, les risques de réception simultanée par le poste central d'au moins deux signaux d'alarme provenant respectivement de deux dispositifs emétteurs différents sont considéra­blement diminués.Insofar as the radio alarm signals of each transmitting device 1 are transmitted respectively at instants randomly determined according to parameters specific to the transmitting devices, the risks of simultaneous reception by the central station of at least two alarm signals coming respectively from two different transmitting devices are considerably reduced.

Chaque signal radioélectrique d'alarme provenant d'un dispositif d'émetteur est reçu au dispositif récepteur du poste central, filtré et démodulé dans le dispositif de filtrage et de démodulation 20 afin de transmettre un signal analogique basse fréquence de l'information d'alarme à un dispositif de transcodage analogique-numérique 21 dont les sorties numériques sont reliées à un dispositif de traitement 22 de préférence à microprocesseur. Le dispositif de traitement 22 est relié à un dispositif d'affichage 23 de l'information relative à la zone géographique où a été déclenchée l'alarme, à l'identification de la personne propriétaire du dispositif émetteur et/ou à l'identification du capteur sollicité, cette information pouvant être également imprimée sur une imprimante 24 reliée au dispositif de traitement 22. Cette information peut également être mémorisée dans un dispositif mémoire 25 et affichée ultérieurement au dispositif d'affichage 23.Each radio alarm signal from a transmitting device is received at the receiving device of the central station, filtered and demodulated in the filtering and demodulating device 20 in order to transmit a low frequency analog signal of the alarm information. to an analog-digital transcoding device 21, the digital outputs of which are connected to a processing device 22 preferably with a microprocessor. The processing device 22 is connected to a device 23 for displaying information relating to the geographical area where the alarm was triggered, to the identification of the person owning the sending device and / or to the identification of the sensor requested, this information can also be printed on a printer 24 connected to the processing device 22. This information can also be stored in a memory device 25 and subsequently displayed on the display device 23.

Par ailleurs, afin de résoudre les problèmes de brouillage mentionnés précédement, chaque information codée d'alarme du dispositif émetteur 1 est subdivisée par le dispositif de traitement 11 en plusieurs parties ou tronçons d'information émis au poste central respectivement sur différents canaux d'émission ou différentes fréquences porteuses d'émission, choisis suivant une règle de composition établie aléatoirement et propre au dispositif émetteur 1. A titre d'exemple, le dispositif de traitement 11 est adapté pour morceler l'information codée d'alarme en quatre parties d'information émises respectivement sur quatre canaux n1-4 ou fréquences f1-f4 choisis aléatoirement, la règle de composition pouvant être basée par exemple sur la date et l'heure de détection de l'événement tel qu'une effraction, par l'un des capteurs associé au dispositif émetteur 1. Le dispositif de traitement 11 peut par exemple choisir les deux premiers signaux binaires relatifs à l'identification de la personne propriétaire du dispositif émetteur 1 de façon qu'ils soient émis sur un premier canal n1 ou fréquence f1, les deux autres signaux binaires relatifs à cette identification pour les émettre sur le canal d'émission n4 ou la fréquence d'émission f4, les deux signaux binaires relatifs à la zone géographique où se trouve le dispositif émetteur 1 pour les émettre sur le canal d'émission n3 ou la fréquence d'émission f3 et les deux derniers signaux binaires relatifs à l'identification du capteur sollicité pour les émettre sur le canal d'émission n2 ou la fréquence d'émission f2. Il est à noter que le dispositif de traitement 11 est relié au dispositif de modulation 12 pour choisir suivant la règle établie aléatoirement les fréquences porteuses d'émission de l'information d'alarme et au dispositif de filtrage 13 pour choisir suivant cette même règle les canaux d'émission de l'information d'alarme. Après réception et démodulation des signaux reçus au dispositif de réception 20 du poste central 2, l'information d'alarme est transmise au dispositif de traitement 22 par le dispositif de transcodage 21, le dispositif de traitement 22 décodant et reconstituant l'information d'alarme qui est affichée au dispositif d'affichage 23 et/ou imprimée à l'imprimante 24 et/ou mémorisée dans le dispositif mémoire 25. Il est à noter que les huit signaux binaires constituant l'information d'alarme peuvent être choisis par le dispositif de traitement 11 au dispositif émetteur 1 suivant un ordre quelconque, différent de celui mentionné précédement. Le dispositif de traitement 22 est adapté pour reconstituer l'information d'alarme même si au moins l'un des signaux binaires est manquant comme cela pourrait être le cas lors d'un brouillage, les trois autres parties d'information reçues au poste central étant suffisantes pour permettre une telle reconstitution.Furthermore, in order to solve the interference problems mentioned above, each coded alarm information item of the sending device 1 is subdivided by the processing device 11 into several parts or sections of information sent to the central station respectively on different sending channels. or different transmission carrier frequencies, chosen according to a randomly established composition rule specific to the transmitter device 1. By way of example, the processing device 11 is adapted to split the coded alarm information into four parts of information transmitted respectively on four channels n1-4 or frequencies f1-f4 chosen at random, the composition rule can be based for example on the date and time of detection of the event such as a break-in, by one of the sensors associated with the emitting device 1. The processing device 11 can by example choose the first two binary signals relating to the identification of the person owning the transmitter device 1 so that they are transmitted on a first channel n1 or frequency f1, the other two binary signals relating to this identification to transmit them on the transmission channel n4 or the transmission frequency f4, the two binary signals relating to the geographical area where the transmitting device 1 is located to transmit them on the transmission channel n3 or the transmission frequency f3 and the last two binary signals relating to the identification of the sensor requested to transmit them on the transmission channel n2 or the transmission frequency f2. It should be noted that the processing device 11 is connected to the modulation device 12 for choosing according to the randomly established rule the carrier frequencies for transmitting the alarm information and to the filtering device 13 for choosing according to this same rule the alarm information transmission channels. After reception and demodulation of the signals received at the reception device 20 of the central station 2, the alarm information is transmitted to the processing device 22 by the transcoding device 21, the processing device 22 decoding and reconstructing the information of alarm which is displayed on the display device 23 and / or printed on the printer 24 and / or stored in the memory device 25. It should be noted that the eight binary signals constituting the alarm information can be chosen by the processing device 11 to the sending device 1 in any order, different from that mentioned above. The processing device 22 is adapted to reconstruct the alarm information even if at least one of the binary signals is missing as could be the case during jamming, the other three pieces of information received at the central station being sufficient to allow such a reconstruction.

Bien entendu, il est nécessaire de transmettre au dispositif récepteur du poste central la règle de composition lui permettant de se caler sur chaque canal ou fréquence d'émission choisie aléatoirement au dispositif émetteur 1.Of course, it is necessary to transmit to the receiving device of the central station the composition rule allowing it to lock onto each channel or transmission frequency chosen randomly to the sending device 1.

Ceci peut être réalisé lors d'une phase dite d'apprentissage consistant à émettre sur un canal choisi aléatoirement au dispositif émetteur 1 une porteuse FM modulée étroitement par un signal comportant une information codée indiquant la règle de composition pour trouver les canaux n1-n4, le canal utilisé aléatoirement pouvant être l'un des canaux n1-n4 ou un canal différent, l'essentiel étant que le canal d'émission de la porteuse FM se trouve dans une largeur de bande de réception du dispositif récepteur 2 suffisamment large pour également recevoir les signaux émis ultérieurement sur les canaux n1-n4. Le signal d'information modulant la porteuse FM peut également comporter un code relatif au type ou règle de codage des canaux n1-n4, par exemple un codage cyclique. Le dispositif récepteur 2, qui est en réception en bande large, détecte l'émission du signal de porteuse FM modulée étroitement et un dispositif électronique faisant partie par exemple du dispositif 20 diminue la largeur de bande d'un filtre de réception à bande large du dispositif 20 jusqu'à détecter avec précision le canal utilisé précité. Le signal de porteuse FM est alors démodulé de façon à transmettre au dispositif de traitement 2 les informations relatives la règle de composition des canaux d'émission n1-n4 et à la règle de codage de ces canaux, ces informations étant mémorisées dans le dispositif mémoire 25.This can be achieved during a so-called learning phase consisting in transmitting on a randomly selected channel to the transmitting device 1 an FM carrier modulated closely by a signal comprising coded information indicating the composition rule for finding the channels n1-n4, the channel used randomly can be one of channels n1-n4 or a different channel, the main thing being that the emission channel of the FM carrier is in a reception bandwidth of the receiving device 2 sufficiently wide to also receive signals transmitted later on channels n1-n4. The information signal modulating the FM carrier may also include a code relating to the type or rule of coding the channels n1-n4, for example a cyclic coding. The receiving device 2, which is in broadband reception, detects the emission of the closely modulated FM carrier signal and an electronic device forming, for example, part of the device 20 decreases the bandwidth of a broadband reception filter of the device 20 until precisely detecting the aforementioned channel used. The FM carrier signal is then demodulated so as to transmit to the processing device 2 the information relating to the composition rule of the transmission channels n1-n4 and to the coding rule for these channels, this information being stored in the memory device. 25.

L'émission terminée, le dispositif émetteur 1 et le dispositif récepteur 2 du poste central sont prédisposés à communiquer sur les quatres canaux différents ou quatre fréquences différentes, l'émission des signaux d'alarme du dispositif émetteur 1 s'effectuant comme décrit précédemment suivant la règle de composition et le dispositif de traitement 22 du dispositif récepteur 2 est adapté pour caler le dispo­sitif de filtrage 20 sur chaque canal ou fréquence d'émission choisi aléatoirement à partir de l'information codée relative à la règle de composition pour retrouver les canaux n1-n4 ou les fréquences f1-f2.When the transmission has ended, the sending device 1 and the receiving device 2 of the central station are prepared to communicate on the four different channels or four different frequencies, the sending of the alarm signals from the sending device 1 being carried out as described above. the composition rule and the processing device 22 of the receiving device 2 is adapted to calibrate the filtering device 20 on each channel or transmission frequency chosen randomly from the coded information relating to the composition rule to find the channels n1-n4 or the frequencies f1-f2.

De plus, à chaque dispositif émetteur 1 peut être associé un dispositif récepteur et le poste central peut de plus comporter un dispositif émetteur. Cette structure permet de s'assurer du bon déroulement des échanges d'information entre le dispositif émetteur 1 et le dispositif récepteur 2 du poste central lors de la phase d'apprentissage. En effet, après avoir détecté avec précision le canal ou la fréquence utilisée pour émettre la porteuse FM modulée étroitement susmentionnée, le dispositif émetteur-récepteur 2 du poste central passe en mode émission pour émettre du dispositif de traitement 22, à l'aide du dispositif récepteur associé au dispositif émetteur 1 un signal d'accusé de réception du signal de porteuse FM et de calage du dispositif récepteur 2 sur le canal ou la fréquence utilisée une fois l'émission du signal de porteuse FM provenant du dispositif émetteur terminée. Le signal d'accusé de réception et de calage contiendra sous forme codée le numéro d'identification du canal utilisé ainsi que la qualité de réception constatée. Le dispositif émetteur-récepteur 2 repassera ensuite en mode réception. Après réception du signal d'accusé de réception et de calage provenant du poste central, le dispositif émetteur-récepteur 1, qui est repassé en mode émission, réémet un signal de porteuse FM contenant sous forme codée le signal d'accusé de réception et de calage, la règle de composition pour trouver les canaux de transmission n1 à n4 ou les fréquences f1 à f4, la règle de codage utilisée pour ces canaux ou fréquences et, le cas échéant, un code d'urgence dans le cas où un événement tel qu'une effraction serait détectée par l'un des capteurs du dispositif émetteur 1 durant cette phase d'apprentissage. Ce second signal de porteuse FM modulée par ces informations codées est reçu par le dispositif émetteur-récepteur 2 qui les démodule afin d'extraire les informations qui sont comparées à celles qui avaient été émises précédemment, de façon à s'assurer de leur identité. Le code d'urgence significatif d'une effraction est mémorisé dans le dispositif mémoire 25 en vue d'une confirmation lors de la communication entre le dispositif émetteur 1 et le dispositif récepteur 2 sur les quatre canaux ou quatre fréquences d'émission choisis aléatoirement.In addition, each sending device 1 can be associated with a receiving device and the central station can also include a sending device. This structure makes it possible to ensure the smooth running of the information exchanges between the sending device 1 and the receiving device 2 of the central station during the learning phase. In fact, after having precisely detected the channel or the frequency used to transmit the closely modulated FM carrier mentioned above, the transceiver device 2 of the central station switches to transmission mode to transmit from the processing device 22, using the device receiver associated with the transmitting device 1 a signal of acknowledgment of reception of the FM carrier signal and setting of the receiving device 2 on the channel or the frequency used once the transmission of the FM carrier signal from the transmitting device. The acknowledgment and calibration signal will contain in coded form the identification number of the channel used as well as the quality of reception noted. The transceiver device 2 will then return to reception mode. After receiving the acknowledgment and timing signal from the central station, the device transceiver 1, which has returned to transmission mode, retransmits an FM carrier signal containing in coded form the acknowledgment and calibration signal, the composition rule for finding transmission channels n1 to n4 or frequencies f1 at f4, the coding rule used for these channels or frequencies and, where appropriate, an emergency code in the event that an event such as a break-in is detected by one of the sensors of the transmitting device 1 during this phase learning. This second FM carrier signal modulated by this coded information is received by the transceiver device 2 which demodulates it in order to extract the information which is compared with that which had been previously transmitted, so as to ascertain its identity. The significant emergency code for a break-in is stored in the memory device 25 for confirmation during the communication between the sending device 1 and the receiving device 2 on the four channels or four transmission frequencies chosen at random.

Une fois cette phase d'aprentissage ou de préparation terminée, le dispositif émetteur 1 est prêt à émettre des signaux d'alarme sur les canaux ou fréquences choisies aléatoirement dès détection d'un événement significatif de l'alarme par l'un des capteurs associés à la manière déjà expliquée précédemment.Once this learning or preparation phase has ended, the emitting device 1 is ready to emit alarm signals on the randomly chosen channels or frequencies upon detection of a significant alarm event by one of the associated sensors in the manner already explained previously.

Il est à noter que la phase de préparation 2 est initialisée dès la détection d'un événement significatif d'une alarme par l'un des capteurs associés au dispositif émetteur 1 avec la condition que le temps mis pour émettre le signal de porteuse FM modulée comprenant notamment l'informantion codée représentative de la règle de composition et pour éventuellement réémettre dans le cas de la communication bi­ directionnelle entre le dispositif récepteur associé au dispositif émetteur 1 et le poste central se trouve dans l'intervalle de temps maximum autorisé.It should be noted that the preparation phase 2 is initialized as soon as a significant alarm event is detected by one of the sensors associated with the transmitter device 1 with the condition that the time taken to transmit the modulated FM carrier signal including in particular the coded information representative of the composition rule and to possibly re-issue in the case of two-way communication directional between the receiving device associated with the sending device 1 and the central station is within the maximum authorized time interval.

Lorsque l'émission des trois signaux d'alarme est terminée, le dispositif de traitement 22 est adapté pour effacer les informations relatives à la règle de composition et au type de codages des canaux ou fréquences d'émission mémorisées dans le dispositif mémoire 25.When the transmission of the three alarm signals is finished, the processing device 22 is adapted to erase the information relating to the composition rule and to the type of coding of the transmission channels or frequencies stored in the memory device 25.

La présente invention peut également s'appliquer à la surveillance médicale de personnes, à la transmission d'informations personnelles, industrielles ou militaires.The present invention can also be applied to the medical surveillance of persons, to the transmission of personal, industrial or military information.

Claims (10)

1. Procédé de télésurveillance notamment de biens et/ou de personnes pour la détection à distance, par un poste central commun d'informations d'alarme provenant d'au moins deux dispositifs émetteurs à capteurs associés et situés en des lieux géographiquement distincts, caractérisé en ce qu'il consiste à émettre de chaque dispositif émetteur (1) au moins une information d'alarme à un instant déterminé aléatoirement et propre à chaque dispositif émetteur (1) lorsque l'un des capteurs associés audit dispositif émetteur a détecté un évènement significatif d'une alarme, l'instant déterminé aléatoirement étant en relation avec des paramètres par exemple propres à chaque dispositif émetteur, tels que la zone géographique où se trouvent le dispositif émetteur (1), le numéro identifiant la personne propriétaire du dispositif et/ou le numéro d'identification du capteur (10) sollicité.1. A method of remote monitoring, in particular of goods and / or people, for remote detection, by a common central station of alarm information originating from at least two transmitter devices with associated sensors and located in geographically distinct places, characterized in that it consists in transmitting from each transmitting device (1) at least one alarm information at a randomly determined instant and specific to each transmitting device (1) when one of the sensors associated with said transmitting device has detected an event significant of an alarm, the instant randomly determined being in relation to parameters for example specific to each transmitting device, such as the geographical area where the transmitting device is located (1), the number identifying the person owning the device and / or the sensor identification number (10) requested. 2. Procédé selon la revendication 1, caractérisé en ce qu'il consiste à émettre une première information d'alarme dans un intervalle de temps maximum autorisé ; à déclencher, à la fin dudit intervalle, une temporisation d'une valeur déterminée ; à calculer aléatoirement, dès le début de la temporisation, une valeur de temps en relation avec les paramètres précités ; à modifier la valeur de la temporisation en fonction de la valeur de temps calculée ; et à émettre l'information d'alarme précitée à l'instant précité en relation avec la valeur modifiée de la temporisation.2. Method according to claim 1, characterized in that it consists in transmitting a first alarm information in a maximum authorized time interval; triggering, at the end of said interval, a time delay of a determined value; in calculating randomly, from the start of the time delay, a time value in relation to the aforementioned parameters; modifying the value of the time delay as a function of the calculated time value; and emitting the aforementioned alarm information at the aforementioned instant in relation to the modified value of the time delay. 3. Procédé selon la revendication 2, caractérisé en ce qu'il consiste à ajouter ou à retrancher à la valeur de la temporisation précitée la valeur calculée de temps et à émettre l'information d'alarme précitée à l'instant précité égale à la somme de la valeur de temporisation et de la valeur de temps calculée ou à la différence entre la valeur de la temporisation et la valeur de temps calculée.3. Method according to claim 2, characterized in that it consists in adding or subtracting from the value of the above-mentioned time delay the calculated time value and in transmitting the aforementioned alarm information at the aforementioned instant equal to the sum of the timer value and the calculated time value or the difference between the timer value and the calculated time value. 4. Procédé selon l'une des revendications précédentes, caractérisé en ce que chaque information d'alarme module en fréquence une onde porteuse et comporte trois codes d'alarme identiques successifs et en ce qu'il consiste à émettre un certain nombre de fois, par exemple trois, l'information d'alarme.4. Method according to one of the preceding claims, characterized in that each alarm information modulates in frequency a carrier wave and comprises three successive identical alarm codes and in that it consists in transmitting a certain number of times, for example three, alarm information. 5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il consiste de plus à subdiviser en plusieurs parties d'information chaque information d'alarme et à émettre les parties d'information au poste central (2) respectivement sur différents canaux ou différentes fréquences porteuses d'émission, choisis suivant une règle de composition établie aléatoirement.5. Method according to one of the preceding claims, characterized in that it further consists in subdividing into several parts of information each alarm information and in transmitting the parts of information to the central station (2) respectively on different channels or different transmission carrier frequencies, chosen according to a randomly established composition rule. 6. Procédé selon la revendication 5, caractérisé en ce qu'il consiste, dès détection d'un événement significatif d'une alarme à au moins l'un des dispositifs émetteurs (1), à transmettre du dispositif émetteur (1) vers le poste central (2) un signal radioélectrique porteur d'au moins une information codée relative à la règle de composition précitée des canaux ou fréquences d'émission et à mémoriser cette règle au poste central (2).6. Method according to claim 5, characterized in that, upon detection of a significant event of an alarm to at least one of the transmitter devices (1), to transmit from the transmitter device (1) to the central station (2) a radio signal carrying at least one coded item of information relating to the above-mentioned composition rule of the transmission channels or frequencies and in storing this rule at the central station (2). 7. Procédé selon la revendication 6, caractérisé en ce que le signal radioélectrique précité est également porteur d'une information codée relative au type de codage des canaux ou des fréquences et mémorisée au poste central (2), ledit signal radioélectrique étant émis sur un canal ou une fréquence d'émission choisi aléatoirement.7. Method according to claim 6, characterized in that the aforementioned radio signal also carries coded information relating to the type of coding of the channels or frequencies and stored in the central station (2), said radio signal being transmitted on a channel or transmission frequency chosen randomly. 8. Procédé selon la revendication 6 ou 7, caractérisé en ce qu'à chaque dispositif émetteur (1) est associé un dispositif récepteur et le poste central comprend de plus un dispositif émetteur transmettant aux dispositifs émetteur-récepteur un signal d'accusé de réception du dispositif récepteur du poste central (2) sur le canal ou la fréquence choisi d'émission du signal porteur d'au moins l'information codée relative à la règle précitée et de calage du récepteur du poste central (2) sur ledit signal, le signal d'accusé de réception et de calage contenant un code d'identification du canal ou fréquence utilisé et un code relatif à la qualité de réception constatée au poste central (2).8. Method according to claim 6 or 7, characterized in that each transmitter device (1) is associated with a receiver device and the central station further comprises a transmitter device transmitting to the transmitter-receiver devices an acknowledgment signal of the central station receiving device (2) on the channel or frequency chosen for transmitting the signal carrying at least the coded information relating to the aforementioned rule and setting the central station receiver (2) on said signal, the acknowledgment and calibration signal containing an identification code of the channel or frequency used and a code relating to the quality of reception observed at the central station (2). 9. Procédé selon la revendication 8, caractérisé en ce que le dispositif émetteur (1) réémet vers le poste central (2) un signal radioélectrique sur le canal ou la fréquence choisi précité et porteur de codes relatifs respectivement à la règle de composition précitée, au type de codage des canaux ou fréquences d'émission et, le cas échéant, d'un code d'alarme d'urgence.9. Method according to claim 8, characterized in that the transmitter device (1) retransmits to the central station (2) a radio signal on the aforementioned chosen channel or frequency and carrying codes respectively relating to the aforementioned composition rule, the type of coding of transmission channels or frequencies and, where appropriate, an emergency alarm code. 10. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il consiste à effacer les informations relatives à la règle de composition précitée et au type de codage des canaux mémorisés au poste central (2) une fois l'émission des signaux radioélectriques d'alarme terminée.10. Method according to one of the preceding claims, characterized in that it consists in erasing the information relating to the above-mentioned composition rule and to the type of coding of the channels stored at the central station (2) once the signals have been transmitted. alarm radio ended.
EP19880402547 1987-10-13 1988-10-10 Remote goods and/or persons supervising method Expired - Lifetime EP0312431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8714130A FR2621723A1 (en) 1987-10-13 1987-10-13 METHOD FOR TAMPERING GOODS AND / OR PEOPLE
FR8714130 1987-10-13

Publications (2)

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EP0312431A1 true EP0312431A1 (en) 1989-04-19
EP0312431B1 EP0312431B1 (en) 1992-01-29

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EP19880402547 Expired - Lifetime EP0312431B1 (en) 1987-10-13 1988-10-10 Remote goods and/or persons supervising method

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EP (1) EP0312431B1 (en)
DE (1) DE3868218D1 (en)
ES (1) ES2029341T3 (en)
FR (1) FR2621723A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP0575753A3 (en) * 1992-06-16 1995-08-16 Motorola Inc Electronic monitoring system
FR2729239A1 (en) * 1995-01-10 1996-07-12 Sgs Thomson Microelectronics THEFT PROTECTION SYSTEM

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
NL9000606A (en) * 1990-03-16 1991-10-16 Ericsson Radio Systems Bv SYSTEM FOR THE TRANSMISSION OF ALARM SIGNALS.
FR2661791A1 (en) * 1990-05-07 1991-11-08 Electrolux Sa METHOD FOR TRANSMITTING A NUMERICALLY ENCODED MESSAGE AND TRANSMISSION SYSTEM.
FR2674658A1 (en) * 1991-03-28 1992-10-02 Fusilier Jean Marie Method for transmission and for remote transmission in blind random mode between several transmitters and receivers
FR2696066B1 (en) 1992-09-18 1994-11-25 Landis Gyr Building Control Fr Method for transmitting messages, and functional unit and installation relating thereto.

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FR1544729A (en) * 1967-08-23 1968-11-08 Radarguard Security Ltd Improvements to security installations
US3866206A (en) * 1973-07-17 1975-02-11 Solid State Technology Emergency signalling system having manually operated generator
DE2351013A1 (en) * 1973-10-11 1975-04-17 Licentia Gmbh Signal blocks transmission method - between several stations operating on same channel involves asynchronous staggering in time
US4020477A (en) * 1975-11-10 1977-04-26 American District Telegraph Company Radio central station alarm system
FR2415406A1 (en) * 1978-01-18 1979-08-17 Compur Electronic Gmbh METHOD AND DEVICE FOR THE TRANSMISSION OF INFORMATION BETWEEN SEVERAL TRANSMITTERS AND A RECEIVER, IN PARTICULAR IN A PERSONAL PROTECTION INSTALLATION
US4234874A (en) * 1978-11-08 1980-11-18 Inventional/Security Development Corp. Alarm system and method thereof
GB2186404A (en) * 1986-02-06 1987-08-12 Notifier Co Security system with signal accuracy checking

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Publication number Priority date Publication date Assignee Title
FR1544729A (en) * 1967-08-23 1968-11-08 Radarguard Security Ltd Improvements to security installations
US3866206A (en) * 1973-07-17 1975-02-11 Solid State Technology Emergency signalling system having manually operated generator
DE2351013A1 (en) * 1973-10-11 1975-04-17 Licentia Gmbh Signal blocks transmission method - between several stations operating on same channel involves asynchronous staggering in time
US4020477A (en) * 1975-11-10 1977-04-26 American District Telegraph Company Radio central station alarm system
FR2415406A1 (en) * 1978-01-18 1979-08-17 Compur Electronic Gmbh METHOD AND DEVICE FOR THE TRANSMISSION OF INFORMATION BETWEEN SEVERAL TRANSMITTERS AND A RECEIVER, IN PARTICULAR IN A PERSONAL PROTECTION INSTALLATION
US4234874A (en) * 1978-11-08 1980-11-18 Inventional/Security Development Corp. Alarm system and method thereof
GB2186404A (en) * 1986-02-06 1987-08-12 Notifier Co Security system with signal accuracy checking

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0575753A3 (en) * 1992-06-16 1995-08-16 Motorola Inc Electronic monitoring system
FR2729239A1 (en) * 1995-01-10 1996-07-12 Sgs Thomson Microelectronics THEFT PROTECTION SYSTEM
EP0722157A1 (en) * 1995-01-10 1996-07-17 STMicroelectronics S.A. Anti-theft protection system for valuables

Also Published As

Publication number Publication date
FR2621723A1 (en) 1989-04-14
EP0312431B1 (en) 1992-01-29
DE3868218D1 (en) 1992-03-12
ES2029341T3 (en) 1992-08-01

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