EP0368710A1 - Die Unterscheidung zwischen mehreren gleichzeitigen Phänomenen erlaubende Vorrichtungen - Google Patents

Die Unterscheidung zwischen mehreren gleichzeitigen Phänomenen erlaubende Vorrichtungen Download PDF

Info

Publication number
EP0368710A1
EP0368710A1 EP89402890A EP89402890A EP0368710A1 EP 0368710 A1 EP0368710 A1 EP 0368710A1 EP 89402890 A EP89402890 A EP 89402890A EP 89402890 A EP89402890 A EP 89402890A EP 0368710 A1 EP0368710 A1 EP 0368710A1
Authority
EP
European Patent Office
Prior art keywords
circuit
delay
transmitter
signals
duration
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.)
Ceased
Application number
EP89402890A
Other languages
English (en)
French (fr)
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
Cerberus Guinard
Original Assignee
Cerberus Guinard Dite Ste
Cerberus Guinard
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, Cerberus Guinard filed Critical Cerberus Guinard Dite Ste
Publication of EP0368710A1 publication Critical patent/EP0368710A1/de
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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 devices for discriminating between several phenomena which occur simultaneously; it relates more particularly to security systems in which the information from the danger sensors or detectors is transmitted to a single receiver and can therefore be received simultaneously.
  • the devices which detect events are independent of each other but they are connected by wire or radio links to a single receiver.
  • two or more events occur simultaneously, there is a risk of accumulation, distortion, disturbance or conflict between the signals received by the receiver, which leads to either the loss of information or the generation of erroneous signals .
  • the object of the present invention is therefore to provide a device for discriminating several simultaneous phenomena, in particular in a security system comprising N detectors / transmitters associated with a single receiver.
  • the invention relates to a device for discriminating between several simultaneous phenomena in a security system which comprises a plurality of transmitters (number N) and a single receiver in which each transmitter comprises an activation circuit. form of a signal representative of the phenomenon detected and a circuit for transmitting said representative signal, characterized in that each transmitter further comprises a delay circuit of variable durations disposed between the shaping circuit and the transmission circuit and a circuit for controlling said variable delay circuit, provided so as to delay said signal representative of a duration which is different from one transmitter to another.
  • each transmitter further comprises a direct link between the shaping circuit and the transmission circuit so as to first transmit the representative signal as soon as said phenomenon appears.
  • the invention will be described in its application to a security system which comprises a number N of detectors / transmitters, each detector / transmitter comprising an alarm detection device 1 and a transmitter 2.
  • the N detectors / transmitters are independent of each other and are connected to a single receiver by wired or radio links.
  • the number N can vary from a few tens to a few thousand.
  • the device of the invention is particularly advantageous when the number N is large because the probability that several events or alarms occur simultaneously, including nuisance alarms, is also high.
  • the invention proposes a transmitter whose functional diagram is given in FIG. 1.
  • the detector 1 is associated with the transmitter 2 and provides it with an alarm signal. when it detects a danger: break-in, theft, smoke, gas etc ...
  • the transmitter 2 comprises a circuit 3 for shaping the signal received from the detector 1 so as to present it in an appropriate form, that provided for the security system, so that it can be identified by the single receiver of the security system. . It is a coded signal which contains a certain amount of information such as the identification of the detector / transmitter and the type of alarm.
  • the coded signal is applied to a delay circuit 4 whose delay is variable according to criteria which will be explained below.
  • the delayed signal is applied to a transmission circuit 5 which puts it into the form required to be transmitted over a wire link or a radio link.
  • Each transmitter also includes a clock circuit 6 which gives signals at a determined frequency, the same from one transmitter to another in a determined security system.
  • the signals produced by the clock circuit 6 are applied to a time base circuit 7 whose output signals control the delay circuit 4 so as to obtain a variable delay as a function of the identification code of the transmitter contained in a memory 8.
  • variable delay is obtained by controlling the delay circuit by signals of variable frequency.
  • the frequency variation is obtained by using information from the transmitter identification code which is different from one transmitter to another.
  • the delay circuit 4 is designed to provide eight different delays, each of which is an integer multiple up to eight of an elementary delay ⁇ .
  • the time base circuit 7 comprises for example a divider circuit 9 which divides the frequency of the clock signal by a factor which will be taken to be equal to the identification code, a factor which may vary from 1 to 4096 if there is 4096 transmitters in the security system.
  • the signals supplied by the divider circuit 9, which therefore have a frequency which is significant for the transmitter concerned, are applied to a counter / decoder 10.
  • the eight outputs of the counter / decoder 10 are connected to the delay circuit 4 so as to make the choice of a delay time among the eight possible.
  • the shaping circuit 3 provides a signal on the conductor 11 as soon as it receives an alarm signal; this signal is used to stop the counter / decoder 10 so that the delay line 4 remains at a determined delay position.
  • Figures 2-a, 2-b and 2-c represent diagrams which make it possible to include / understand the obtaining of a delay among eight different delays.
  • the staircase curve 22, 23 or 24 represents, as a function of time, the delays obtained, each level corresponding to a decoding position and therefore to a determined delay.
  • the signals which are applied to the counter / decoder 10 have a different frequency from one transmitter to another, the duration of each stage is also different and the same is true of that of the complete cycle. In Figure 2, only one complete cycle has been shown for each transmitter plus the start of the next cycle.
  • the diagram of figure 2-a corresponds to a transmitter E1 (identification code 1), that of figure 2-b to a transmitter E i (identification code i) and that of the figure 2-c to a transmitter E N (identification code N - the last of the system).
  • E1 identification code 1
  • E i identity code 1
  • E N identity code N
  • this time t x corresponds to the fourth level for E1, to the third level for E i and to the second level for E N . Consequently, in E1, the delay will be 4 ⁇ ; in E i , the delay will be 3 ⁇ ; in E N the delay will be 2 ⁇ .
  • FIG. 1 The operation of the detector / transmitter of FIG. 1 which has just been described shows that the alarm signals of three simultaneous events are transmitted to three different moments.
  • the diagrams of figures 3-a, 3-b and 3-c show the pulses 25, 26 and 27 of the emitters E1, E i and E N in the case described in relation to figure 2. It will be noted that the signals E1, E i and E N are coded signals and can each take the form of a train of pulses.
  • the elementary delay ⁇ must be greater than the discrimination time of the receiver. Indeed, during this time ⁇ , events can occur in any one of the detectors / transmitters and it is therefore necessary that the delays which will be applied to them be greater than ⁇ so that the signals received by the receiver can be discriminated. Furthermore, the various events appearing during the duration ⁇ must give rise to a different delay in transmission, which means that the delay duration which is selected must be different from one transmitter to another. For this to be so, it is necessary that, in each transmitter, the different delay times are selected in a time of less than ⁇ , which means that the frequency of the signals supplied by the divider circuit 9 must be chosen accordingly. On the figures 2-a, 2-b and 2-c, that means that the duration of the curves in staircase 22, 23 and 24 must be lower than ⁇ .
  • the probability of having the same delay on two transmitters is all the greater the smaller the number of possible delays and the greater the number of transmitters.
  • N we are led to have a different number p of delays. also large, which is not always possible to achieve.
  • the device of FIG. 1 is modified by the addition of the link 20 mentioned above between the shaping circuit 3 and the transmission circuit 5.
  • This link 20 makes it possible to control the circuit 5 so that '' it emits a first pulse or train of pulses at the onset of the event, this first pulse being followed by a second pulse which is delayed by the delay line 4 under the same conditions as what has been described above .
  • the single receiver will receive for each transmitter two pulses and will thus only take account of the first pulse received referenced 28 on the figure 3-a.
  • the receiver will first receive simultaneously three pulses which it will not be able to discriminate, these are the pulses 28, 29 and 30 of FIG. 3. It will then receive the pulses 25, 26 and 27 which are shifted in time and which can therefore be discriminated.
  • the receiver receives two successive pulses which it can discriminate. It can take the second impulse into account to validate the first, which increases security.
  • the receiver which is used is of the conventional type but it must include complementary logic circuits according to the chosen device, complementary circuits which are within the reach of the skilled person. .
  • the main elements of a single receiver of a security system comprises a reception circuit 35 which receives and detects the signals transmitted by the detectors / transmitters.
  • This reception circuit 35 is connected to a shaping circuit 36, the output signals of which are applied to a decoder 37.
  • the logic signals supplied by the decoder 37 are applied to a logic circuit 38.
  • such a receiver corresponds to detectors / transmitters operating according to the first device (FIG. 1).
  • the receiver With detectors / transmitters operating according to the second device, the receiver must be completed by a link 39 between the reception circuit 35 and the logic circuit 38, this link serving to supply a signal which indicates that several pulses are received simultaneously.
  • the logic circuit 38 must be modified to include complementary circuits so that the receiver does not take into account the first pulses received.
  • this link 39 can also be used to validate the first train of pulses received by the second, as indicated above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)
EP89402890A 1988-10-25 1989-10-19 Die Unterscheidung zwischen mehreren gleichzeitigen Phänomenen erlaubende Vorrichtungen Ceased EP0368710A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8813921A FR2638268B1 (fr) 1988-10-25 1988-10-25 Dispositifs pour permettre de discriminer entre plusieurs phenomenes simultanes
FR8813921 1988-10-25

Publications (1)

Publication Number Publication Date
EP0368710A1 true EP0368710A1 (de) 1990-05-16

Family

ID=9371249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402890A Ceased EP0368710A1 (de) 1988-10-25 1989-10-19 Die Unterscheidung zwischen mehreren gleichzeitigen Phänomenen erlaubende Vorrichtungen

Country Status (2)

Country Link
EP (1) EP0368710A1 (de)
FR (1) FR2638268B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446979A1 (de) * 1990-03-16 1991-09-18 Ericsson Radio Systems B.V. Alarmsignalübertragungsanlage mit Wiederholung
EP0607562A1 (de) * 1992-12-18 1994-07-27 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Funkalarmanlage mit asynchroner Übermittlung von Meldungen über Zeitkanäle unterschiedlicher Periodendauern
FR2748340A1 (fr) * 1996-05-02 1997-11-07 Dumberger Electro Bobinage Ets Systeme de surveillance utilisant une centrale d'alarme et au moins un boitier de detection a liaison radio mono-frequence et mono-directionnelle
EP1204954A1 (de) * 1999-08-16 2002-05-15 Checkpoint Systems, Inc. Warenüberwachungssystem mit variablen zeitverschiebungen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665312A (en) * 1969-10-06 1972-05-23 Goldman Paul Radio alarm system
DE2351013A1 (de) * 1973-10-11 1975-04-17 Licentia Gmbh Nachrichtenuebermittlungssystem
FR2415406A1 (fr) * 1978-01-18 1979-08-17 Compur Electronic Gmbh Procede et dispositif pour la transmission d'informations entre plusieurs emetteurs et un recepteur, en particulier dans une installation de protection de personnes
GB2186404A (en) * 1986-02-06 1987-08-12 Notifier Co Security system with signal accuracy checking

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665312A (en) * 1969-10-06 1972-05-23 Goldman Paul Radio alarm system
DE2351013A1 (de) * 1973-10-11 1975-04-17 Licentia Gmbh Nachrichtenuebermittlungssystem
FR2415406A1 (fr) * 1978-01-18 1979-08-17 Compur Electronic Gmbh Procede et dispositif pour la transmission d'informations entre plusieurs emetteurs et un recepteur, en particulier dans une installation de protection de personnes
GB2186404A (en) * 1986-02-06 1987-08-12 Notifier Co Security system with signal accuracy checking

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446979A1 (de) * 1990-03-16 1991-09-18 Ericsson Radio Systems B.V. Alarmsignalübertragungsanlage mit Wiederholung
US5164704A (en) * 1990-03-16 1992-11-17 Ericsson Radio Systems B.V. System for transmitting alarm signals with a repetition
EP0607562A1 (de) * 1992-12-18 1994-07-27 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG Funkalarmanlage mit asynchroner Übermittlung von Meldungen über Zeitkanäle unterschiedlicher Periodendauern
FR2748340A1 (fr) * 1996-05-02 1997-11-07 Dumberger Electro Bobinage Ets Systeme de surveillance utilisant une centrale d'alarme et au moins un boitier de detection a liaison radio mono-frequence et mono-directionnelle
EP1204954A1 (de) * 1999-08-16 2002-05-15 Checkpoint Systems, Inc. Warenüberwachungssystem mit variablen zeitverschiebungen
JP2003507801A (ja) * 1999-08-16 2003-02-25 チエツクポイント システムズ， インコーポレーテツド 可変時間シフトを用いる電子式物品保安システム
EP1204954A4 (de) * 1999-08-16 2005-01-12 Checkpoint Systems Inc Warenüberwachungssystem mit variablen zeitverschiebungen

Also Published As

Publication number Publication date
FR2638268A1 (fr) 1990-04-27
FR2638268B1 (fr) 1994-02-11

Similar Documents

Publication Publication Date Title
EP0629758B1 (de) Fernbedienungssystem mit mehreren funktionellen Reichweiten ausgewählt auf Grund verschiedener Detektionsschwellen
FR2522829A1 (fr) Dispositif de detection du passage d'etiquettes a proximite d'un poste de controle
FR2536781A1 (fr) Installation de verrouillage central pour un vehicule automobile
FR2526980A1 (fr) Systeme de telecommande en multiplex temporel
EP0094279B1 (de) Verfahren zum Schutz eines Fernüberwachungssystemes gegen Sabotage und System zur Ausführung dieses Verfahrens
FR2589564A1 (fr) Mine avec capteurs de reveil et de declenchement
FR2574948A1 (fr) Procede d'interrogation ami-ennemi et systeme utilisant ce procede
EP0897563A1 (de) Verfahren zur auswahl eines elektronischen moduls aus mehreren im abfragefeld eines endgeräts
FR2537308A1 (fr) Procede et dispositif de transmission d'informations
EP0368710A1 (de) Die Unterscheidung zwischen mehreren gleichzeitigen Phänomenen erlaubende Vorrichtungen
EP0781440B1 (de) Vorrichtung und verfahren zur fernüberwachung von einem gegenstand
FR2754957A1 (fr) Procede de decodage d'un signal numerique ainsi qu'un systeme de bus et une unite peripherique pour sa mise en oeuvre
FR2707394A1 (fr) Elément et détecteur photosensibles pour la détection d'éclats lumineux.
EP0199294B1 (de) Verfahren und Anordnung zur Signalisierung über eine bidirektionale digitale Übertragungsstrecke
EP0193453B1 (de) Anordnung zur Überwachung der Impulsperiodendauer
FR2483104A1 (fr) Dispositif indicateur de zone d'alarme
EP0726666B1 (de) Schnittstellenvorrichtung zwischen Haus-Netzwerkübertragungsmedien
EP0312431B1 (de) Waren- und/oder Personen-Fernüberwachungsverfahren
WO2002054354A1 (fr) Systeme de detection du passage d'individus ou objets par une entree-sortie a un espace delimite
EP0125624B1 (de) Vorrichtung zur elektromagnetischen Übertragung eines Vorganges in einer gestörten Umgebung
EP0100523B1 (de) Verfahren zur Informationsübertragung über einen einzigen Übertragungskanal und Anwendung dieses Verfahrens insbesondere in Einrichtungen die ein Alarmsystem bilden
EP0028188A1 (de) Bakensystem zur etappenweisen Informationsübertragung
EP0184107A1 (de) Verfahren zur Signalisierung für eine digitale Verbindungsleitung und Vorrichtung zur Durchführung des Verfahrens
FR2537368A1 (fr) Systeme d'identification de stations locales par un poste central d'interrogation
FR2478855A1 (fr) Systeme pour la surveillance a distance d'une pluralite de dispositifs d'alarme

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19900620

17Q First examination report despatched

Effective date: 19920611

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19930731