EP0366527B1 - Sicherheitssystem mit funkelektrischer Übertragung - Google Patents

Sicherheitssystem mit funkelektrischer Übertragung Download PDF

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Publication number
EP0366527B1
EP0366527B1 EP89402891A EP89402891A EP0366527B1 EP 0366527 B1 EP0366527 B1 EP 0366527B1 EP 89402891 A EP89402891 A EP 89402891A EP 89402891 A EP89402891 A EP 89402891A EP 0366527 B1 EP0366527 B1 EP 0366527B1
Authority
EP
European Patent Office
Prior art keywords
signals
transmission
alarm
transmitter
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89402891A
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English (en)
French (fr)
Other versions
EP0366527A1 (de
Inventor
Jacques Duboys
Gérard Akenine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cerberus Guinard Dite Ste
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Cerberus Guinard Dite Ste
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 Cerberus Guinard Dite Ste filed Critical Cerberus Guinard Dite Ste
Priority to AT89402891T priority Critical patent/ATE87385T1/de
Publication of EP0366527A1 publication Critical patent/EP0366527A1/de
Application granted granted Critical
Publication of EP0366527B1 publication Critical patent/EP0366527B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/16—Security signalling or alarm systems, e.g. redundant systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm 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
    • G08B25/10—Alarm 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 invention relates to security systems, that is to say, danger warning systems which signal dangers such as for example a break-in, theft, fire, smoke, gas, etc. It relates more particularly to security systems in which the signaling or transmission of danger information and control orders for the security systems is carried out by radio means.
  • danger information also called “events”
  • Wired links are normally monitored, that is to say that they include devices to detect anomalies which prevent the transmission of events such as interruption, short-circuit, earthing, which makes the system capable of continuously transmitting safety-related signals.
  • the transmitters are of the autonomous type, i.e. they have their own source of energy which is unique and which is not backed up, i.e. -to say that there is no backup source. Consequently, a permanent transmission of signals would involve the use of energy sources whose volume, weight and cost are prohibitive in the state of the art.
  • the legislation currently in force does not allow permanent occupation of the radio frequency bands, but only of the order of thirty seconds every five minutes, and it is therefore necessary to distribute the test signals over time. system.
  • the object of the present invention is therefore to provide a radio transmission security system which has operating security compatible with the standards in force while respecting the constraints indicated above.
  • the goal is achieved by ensuring the transmission of information, instead of monitoring the proper functioning of the transmission.
  • the invention proposes to use at least two transmission devices, each transmitting the same information signals, with the exception of the identity of the transmission device, on the same frequency to a single receiver. but shifted in time relative to each other.
  • the detection of two identical and offset signals makes it possible to validate the information received and the detection of a single signal gives the information, but also indicates the existence of a fault in a determined transmission device .
  • the invention relates to a security system with radio transmission in which each alarm detection device is associated with a transmitter and in which several transmitters are associated with a single receiver characterized in that each transmitter comprises at least two identical transmission devices designed to receive the output signals of the alarm detection device and transmit on the same transmission frequency at least two substantially identical signals which are time-shifted by a determined time so as to transmit to the single receiver at least one alarm signal in the event of failure of an emission device.
  • the system is also characterized in that the single receiver includes a logic circuit for comparing the signals transmitted by a transmitter and providing signals indicating the type of alarm as well as possibly the identity of the transmission device which is faulty.
  • the security system comprises a plurality of transmitters 1, a number N for example, which are in radio link with a single receiver 15 (FIG. 2).
  • Each transmitter 1, associated with an alarm or event detection device 2 comprises two identical emission devices 3 and 4, an autonomous electrical supply device 5 of the battery type and a battery control device 6.
  • Each transmission device 3 (or 4) comprises a logic circuit 7 (or 8), a delay circuit 9 (or 10) and a transmission circuit proper 11 (or 12).
  • Each logic circuit 7 or 8 receives the alarm signal or signals supplied by the detection device 2, including the alarm signal corresponding to the possible displacement of the transmitter 1. It also receives an alarm signal relating to the state of the power supply device 5.
  • each logic circuit 7 or 8 On the basis of the signals received, each logic circuit 7 or 8 provides an output signal S1 or S2 only if the received signals correspond to an alarm detected by the detection device 2 or the battery control device 6.
  • the signals S1 and S2 are of the coded type so as to indicate in particular the type of alarm and the identity of the transmission device concerned.
  • the signal S1 is delayed by a duration t1 in the delay circuit 9 and this delayed signal S′1 is transmitted by the transmission circuit 11 (radio signal E1).
  • the signal S2 is delayed by a duration t2 in the delay circuit 10 and this delayed signal S′2 is transmitted by the transmission circuit 12 (radio signal E2).
  • the receiver 15 of the security system comprises, as shown in the functional diagram of FIG. 2, a circuit 16 for receiving the radio signals E1 and E2, a circuit for shaping 17 the signals received E1 and E2 for obtain signals R1 and R2 respectively, a decoding circuit 18 of the signals R1 and R2 and a logic decision circuit 19. It further comprises a transmitter 20 which is used to control the proper functioning of the reception circuit 16 and a device power supply 21 of the back-up type, that is to say operating continuously with the desired security.
  • the decoding circuit 18 (or decoder) notably determines the origin of the signal received, that is to say the identity of the transmission device which transmitted it thanks to the code contained in the signal E1 or E2.
  • the logic circuit 19 of the receiver 15 includes a first memory 22 for recording the received signal R1 and a second memory 23 for recording the received signal R2. Referral to one or the other memory 22 or 23 is obtained by the code of the identity of the transmission device concerned. The contents of these two memories are compared in a comparator 24 which provides a signal indicating the identity or not of the signals R1 and R2 (apart from the code part giving the identity of the transmission device). The output terminal of the comparator 24 is connected to an input terminal of an AND logic circuit 25 the other input terminal of which is connected to a delay circuit 29 of duration t3 equal to the maximum duration of reception of the receiver 15, counted from the moment of reception of the signal E1, the first to date.
  • the output signal from comparator 24 is only taken into account at the end of the duration t3.
  • the duration t3 must obviously be much greater than t2 - t1. If at the end of duration t3, the two signals R1 and R2 are identical, the comparator signal will be taken into account and will mean that there is an alarm signal from the transmitter 1 and that all works correctly. On the other hand, if at the end of the duration t3, one of the two signals R1 and R2 exists alone, this will also mean that there is an alarm signal from the transmitter 1 and that there is a fault in one of the two transmitting devices 3 and 4.
  • the signal E1 or E2 which is received.
  • This determination can be made using the AND circuits 26 and 27, one of the input terminals of which is connected to the output terminal of the AND circuit 25 via an inverter 28.
  • the other input terminal of the AND circuit 26 is connected to memory 22 (signal R1) while the other input terminal of the AND circuit 27 is connected to memory 23 (signal R3), the two signals coming from memories 22 and 23 indicating the presence or 'absence of signals R1 and R2.
  • the signal R1 is absent, the circuits AND 25 and 26 will be closed while the AND circuit 27 will be open, which will indicate that the transmitting device 3 has failed.
  • the signal R2 is absent, the AND circuits 25 and 27 will be closed while the AND circuit 26 will be open, which will indicate that the transmission device 4 has failed.
  • the temporal diagrams of figures 3-a, 3-b, 3-c and 3-d indicate the possible sequences of the signals on the emission and the reception by supposing that the transmission time is negligible compared to the durations t1, t2 or t3.
  • the event which is detected by the detection device 2 occurs at time T0 (figure 3-a).
  • the duration t1 corresponds to the delay applied to the signal E1 and the duration t2 corresponds to the delay applied to the signal E2.
  • the diagram of the figure 3-b corresponds to the emission and the reception of the two signals R1 and R2.
  • the diagram of the figure 3-c corresponds to a sequence of alarm signals indicating that there is an event and that the emission device 3 is in fault.
  • the diagram of the figure 3-d corresponds to a sequence of alarm signals indicating that there is an event and that the emission device 4 is in fault.
  • control transmitter transmits signals which are received by said receiver.
  • the received signals are analyzed in the same way as the alarm signals from the transmitting devices 3 and 4. This analysis makes it possible to determine a possible failure of the receiver.
  • the signals S1, S2 which are produced by the logic circuits 7 and 8 and therefore the transmitted signals E1, E2 are made up of codes which identify in particular the transmitter, the type of alarm and the identity of the transmission device concerned.
  • the analysis of signals received that is to say signals E1 or E2 recorded respectively in memories 22 and 23, makes it possible to determine the transmitter in question as well as the type of alarm, for example a battery whose voltage is lower than a certain security threshold.
  • the security system according to the invention has been described by showing only one transmitter, but it is understood that it can be implemented with a very high number of transmitters for the same single frequency receiver, all the transmitters being identical except for their identification code.
  • the invention has been described with a transmitter comprising two transmission devices 3 and 4 but it is clear that it also applies to a transmitter comprising more than two transmission devices in the event that it is desired to obtain a greater transmission guarantee.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Transceivers (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Fire Alarms (AREA)

Claims (9)

  1. Sicherheitssystem mit funkelektrischer Übertragung, bei dem jede Alarmdetektorvorrichtung (2) einem Sender (1) zugeordnet ist und bei dem mehrere Sender (1) einem einzigen Empfänger (15) zugeordnet sind,
       dadurch gekennzeichnet,
       daß jeder Sender (1) mindestens zwei identische Sendevorrichtungen (3, 4) enthält, die zum Empfang der Ausgangssignale der Alarmdetektorvorrichtung (2) und zum Aussenden mindestens zweier im wesentlichen identischer Signale auf der, gleichen Sendefrequenz vorgesehen sind, die um einen bestimmten Zeitabschnitt derart zeitlich gegeneinander versetzt sind, daß an den einzigen Empfänger (15) mindestens ein Alarmsignal übermittelt wird, falls eine Sendevorrichtung (3 bzw. 4) ausfällt.
  2. Sicherheitssystem nach Anspruch 1, dadurch gekennzeichnet, daß der einzige Empfänger (15) einen Logik-Schaltkreis (19) enthält, um die von einem Sender (1) ausgesandten Signale zu vergleichen und Signale zu liefern, die die Alarmart sowie gegebenenfalls die Identität der ausgefallenen sendevorrichtung (3 bzw. 4) anzeigen.
  3. Sicherheitssystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Logik-Schaltkreis (19) einen Speicher (22, 23) zum Einlesen der empfangenen Signale, einen Komparator (24) zum Vergleichen der Identität der empfangenen Signale sowie eine derartige Prüfschaltung (25, 29) für das vom Komparator (24) gelieferte Signal enthält, daß das besagte Komparatorsignal nur berücksichtigt wird, wenn es einem gewissen Zeitabschnitt nach dem Empfang des ersten von einem Sender stammenden Signals vorliegt.
  4. Sicherheitssystem nach Anspruch 3, dadurch gekennzeichnet, daß der Logik-Schaltkreis (19) für den Fall des Empfangs nur eines der beiden ausgesendeten Signale weitere Einrichtungen (26, 27, 28) zur Bestimmung, welche Sendevorrichtung (3 bzw. 4) ausgefallen ist, enthält.
  5. Sicherheitssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der einzige Empfänger (15) außerdem einen Überwachungssender (20) enthält, der solche Signale aussendet, die eine Überwachung des ordnungsgemäßen Funktionierens des Empfängers (15) gestatten.
  6. Sicherheitssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß jeder Sender (1) außerdem eine Überwachungsvorrichtung (6) für den Zustand der Stromversorgungseinrichtung (5) enthält, so daß ein Alarmsignal ausgelöst wird, falls die Kenngrößen dieses Zustands einen festgelegten Schwellenwert unterschreiten.
  7. Sicherheitssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß jeder Sender (1) außerdem eine Einrichtung zum Erkennen der Anwesenheit des Senders (1) am vorgesehenen Ort derat enthält, daß ein Alarmsignal ausgelöst wird, falls der Sender (1) entfernt wird.
  8. Verfahren zur Sicherstellung der Übertragung von Alarmsignalen in einem Sicherheitssystem mit funkelektrischer Übertragung, bei dem jede Alarmdetektorvorrichtung (2) einem Sender (1) zugeordnet ist und bei dem mehrere Sender (1) einem einzigen Empfänger (15) zugeordnet sind, dadurch gekennzeichnet, daß es folgende Verfahrensschritte umfaßt:
    - Erzeugung von zwei identischen Alarmsignalen in zwei getrennten Vorrichtungen,
    - Aussendung von zwei durch einen festgelegten Zeitabschnitt getrennten Alarmübertragungssignalen durch besagte Vorrichtungen,
    - Empfang wenigstens eines der beiden ausgesandten Signale, um den Alarm zu bestimmen, der dem entsprechenden Signal zugrunde liegt.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß es außerdem den folgenden Schritt umfaßt:
       - Vergleich der empfangenen Signale dergestalt, daß die ausgefallene Sendevorrichtung (3, 4) erkannt wird.
EP89402891A 1988-10-25 1989-10-19 Sicherheitssystem mit funkelektrischer Übertragung Expired - Lifetime EP0366527B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89402891T ATE87385T1 (de) 1988-10-25 1989-10-19 Sicherheitssystem mit funkelektrischer uebertragung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8813920A FR2638267B1 (fr) 1988-10-25 1988-10-25 Systeme de securite a transmission radioelectrique
FR8813920 1988-10-25

Publications (2)

Publication Number Publication Date
EP0366527A1 EP0366527A1 (de) 1990-05-02
EP0366527B1 true EP0366527B1 (de) 1993-03-24

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ID=9371248

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EP89402891A Expired - Lifetime EP0366527B1 (de) 1988-10-25 1989-10-19 Sicherheitssystem mit funkelektrischer Übertragung

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EP (1) EP0366527B1 (de)
AT (1) ATE87385T1 (de)
DE (1) DE68905567T2 (de)
FR (1) FR2638267B1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848231A (en) * 1970-12-31 1974-11-12 Baldwin Electronics Inc Alarm system utilizing pulse position modulation and dual conductor sensor
US3909722A (en) * 1973-06-22 1975-09-30 Jbh Electronic Systems Inc Variable frequency communication system
US4575712A (en) * 1984-02-27 1986-03-11 Pittway Corporation Communication system
US4665385A (en) * 1985-02-05 1987-05-12 Henderson Claude L Hazardous condition monitoring system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 3, no. 127 (E-146), 23 octobre 1979 *

Also Published As

Publication number Publication date
FR2638267A1 (fr) 1990-04-27
ATE87385T1 (de) 1993-04-15
DE68905567D1 (de) 1993-04-29
FR2638267B1 (fr) 1990-12-21
DE68905567T2 (de) 1993-08-26
EP0366527A1 (de) 1990-05-02

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