EP1287508B1 - Selbstgeregelte alarmvorrichtung mit geringem energieverbrauch - Google Patents

Selbstgeregelte alarmvorrichtung mit geringem energieverbrauch Download PDF

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Publication number
EP1287508B1
EP1287508B1 EP01936588A EP01936588A EP1287508B1 EP 1287508 B1 EP1287508 B1 EP 1287508B1 EP 01936588 A EP01936588 A EP 01936588A EP 01936588 A EP01936588 A EP 01936588A EP 1287508 B1 EP1287508 B1 EP 1287508B1
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EP
European Patent Office
Prior art keywords
signal
width
alarm
microprocessor
comparator
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
EP01936588A
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English (en)
French (fr)
Other versions
EP1287508A1 (de
Inventor
François PHILIPPE
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.)
F and F International Sarl
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F and F International Sarl
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Publication date
Application filed by F and F International Sarl filed Critical F and F International Sarl
Publication of EP1287508A1 publication Critical patent/EP1287508A1/de
Application granted granted Critical
Publication of EP1287508B1 publication Critical patent/EP1287508B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
    • 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
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components

Definitions

  • the present invention relates to devices alarm capable of detecting pressure differences acoustics following untimely opening or the breaking of a door or a window and concerns in particular a very low self-regulating alarm device energy consumption.
  • the signal output of a microphone is first amplified, then, in general, compared to a reference voltage fixed in a comparator whose output can have two possible states according to the relative value of the signal from the microphone and the reference voltage.
  • These devices trigger the alarm under the effect of an aperiodic compression wave, while they are insensitive to a periodic signal such as an audible sound, the monitoring taking place in particular on the shape and the amplitude signals received.
  • the threshold adjustment sensitivity should be done manually, case by case.
  • a differential sound pressure detector has a sensitivity threshold permanently set to its value optimal by the microphone output signal which is function of atmospheric disturbances captured at the input microphone.
  • the device described in the patent EP 0.317.459 uses electronic components analog such as capacitors, resistors including specifications vary from component to component for the same type of component. This dispersion of characteristics for a given component, even if it is relatively small can cause deviations of important functioning between two devices in the measure the operation of the device results from the combination of a plurality of such components.
  • a such a device is generally powered continuously and therefore leads to excessive energy consumption due to fact that it is connected to the mains in a central wired alarm.
  • the object of the invention is to provide self-regulating alarm devices with deviations of insignificant operation from one device to another of the in particular that part of the functions of the device is produced by a microprocessor.
  • Another object of the invention is to provide a alarm device of the above type having a very low energy consumption thanks to the use of a microprocessor.
  • the invention relates to a device alarm according to claim 1.
  • the signals received by a acoustic sensor 10 are transmitted on the one hand at the input + of a gain amplifier means constant 12 and on the other hand at the input + a means adjustable gain amplifier 14 via a resistor 16 connected to a voltage of 0.8 volts.
  • the amplifier means 12 is mainly composed an operational amplifier 13 comprising between its input - and its output a resistance (worth 3M ⁇ ) and a capacitor (with a value of 1nF) serving as feedback to limit the gain.
  • the entrance - is connected to the ground via an electrolytic capacitor preventing amplification of the resting voltage.
  • the amplifier means 14 is mainly composed an operational amplifier 15 comprising between its input - and its output a resistance (worth 4.7M ⁇ ) and a capacitor (with a value of 1nF) serving as feedback to limit the gain.
  • the input - is connected to the ground via an electrolytic capacitor 20 preventing amplification of the resting voltage and of a potentiometer 22 from 210 to 10 000 whose adjustment is made in depending on the room in which the device is installed alarm, the necessary gain of the amplifier means being the lower the said room is watertight on the plan acoustic.
  • the output of the amplifier means 12 is connected to the input + of a comparator 24 which has the function of transform the analog signal supplied by the means amplifier 12 into a binary signal whose width is depending on the size of the disturbance and that is transmitted to microprocessor 26 in order to self-regulate the alarm device.
  • the output of the amplifier means 14 is connected to the input + of a comparator 34 which transforms the signal analog supplied by the amplifier means 14 in a signal binary which is transmitted to microprocessor 26 for the purpose inform him of an untimely door opening or a breaking in.
  • microprocessor 26 transmits a signal to the alarm means 28 which is preferably a radio transmitter transmitting the alarm signal to the alarm center.
  • the microprocessor 26 is programmed to transmit a signal on its output 32 when it detects a digital signal of value 1 on its input 30 from comparator 24.
  • This signal is formed by pulses of variable width depending on the number and the width of the pulses of value 1 detected on entry 30. Indeed, assuming a sampling of a 150Hz frequency of this input, an input bit of a 15Hz frequency will therefore be sampled approximately 5 times if the received signal is a perfect sinusoid. Every sampling, the width of the pulse transmitted over the line 32 will be increased. In the same way this width is decreased each time the microprocessor detects the value 0 of the signal on line 30. So we see that the higher the the stronger the wind, the more the impulses transmitted at the output of the comparator 24 are wide and the more the pulse delivered on line 32 will also be wide. We thus obtain a pulse width modulation.
  • the pulse transmitted on line 32 charges more or minus the capacitor 38 (of value 1 ⁇ F) through the resistor 36 (of value 4.7 M ⁇ ) and provides a voltage of which the value depends on the width of the pulse supplied on the line 32.
  • the larger this pulse the higher the voltage supplied on the input - of comparator 34 is high and less is the sensitivity of comparator 34 to react to signal received from sensor 10 to trigger alarm 28.
  • the length of time the microprocessor 26 reacts to the presence of the atmospheric disturbance in transmitting increasingly large impulses to integrator 36-38 can be limited to a maximum value such as 10 or 20s.
  • a self-calibration of the device This takes place at the end of the phase initialization, after power up, and consists for the microprocessor to find the width of the signal 32 which allows for optimal sensitivity. By proceeding by successive adjustments of signal 32, it searches for the sensitivity threshold causing untimely triggering materialized by a permanent signal 32. Readjustments periodicals are however necessary due to possible thermal variations. For this, the microprocessor does this in two ways. Without incident, it recalculates the optimal signal width 32 (for example every 1 ⁇ 2 hour). In the event of an incident detected, it checks that it is not a trigger untimely by testing the sensitivity threshold before validate the incident.
  • FIG. 2 makes it possible to illustrate the value of the signals S 1 at the output of the amplifier means 12, S 2 at the output of the comparator 24, S 3 at the output of the comparator 34, S 4 on the output line 32, S 5 at the input of the comparator 34 and S 6 at the output of the microprocessor 26 towards the alarm 28, when 1) the device is at rest, 2) in the presence of an atmospheric disturbance and 3) in the presence of d 'a break-in.
  • the signal S 1 supplied by the amplifier means 12 has a constant value (0.8 volts) and the comparators 24 and 34 each provide an almost zero signal S 2 or S 3 .
  • the signal S 4 supplied by the microprocessor on line 32 is a regular signal which makes it possible to obtain a signal S 5 on the input - of the comparator equal to approximately 1 volt.
  • the signal S 3 being reduced to 0, it is the same for the alarm signal S 6 .
  • the signal S 1 supplied at the output of the amplifier means 12 becomes approximately sinusoidal and the signal S 2 supplied to the microprocessor is formed of pulses of variable width according to the importance of the disturbance.
  • the signal S 3 is still almost zero because the sensitivity threshold has been increased. Indeed, the existence of pulses S 2 leads to the generation by the microprocessor of pulses S 4 whose width depends on the width and the number of pulses S 2 , which results in a signal S 5 of higher voltage ( 2 volts in this case) at the input - of comparator 34. As before, the signal S 3 being reduced to 0, the same is true of the alarm signal S 6 .
  • the analysis of the width of the signal S 3 by the microprocessor could make it possible to differentiate the alarm signal supplied. It could thus be provided that if this width is between a minimum width and a maximum width, it is a shock (against a window for example) or an attempted break-in, while the break-in will not be proven that if this width is greater than the maximum width.
  • the comparator 24 could be replaced by an analog-to-digital converter making it possible to provide bit configurations associated with the signature of possible atmospheric disturbances, said configurations being analyzed and recognized by the microprocessor 26 before the latter transmits a signal S 4 on its output 32 which is a function of the detected disturbance.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Fire Alarms (AREA)
  • Emergency Alarm Devices (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Alarm Systems (AREA)

Claims (10)

  1. Eine Alarmvorrichtung, die Folgendes umfasst: einen Atmosphärendrucksensor (10), der einerseits einem ersten Verstärkermittel (12) und andererseits einem zweiten Verstärkermittel (14) ein analoges Signal bereitstellt, einen ersten Vergleicher (34), dessen positiver Eingang mit dem Ausgang des zweiten Verstärkermittels verbunden ist und dessen Ausgang im Falle eines Einbruchs oder eines Einbruchsversuchs einem programmierten Mikroprozessor (26) ein Alarmsignal bereitstellt, Selbstregelungsmittel, die auf eine atmosphärische Störung, wie etwa Wind von sinusförmiger Darstellung, reagieren und einen Analog-Digital-Umwandler (24) umfassen, dessen Eingang mit dem Ausgang des ersten Verstärkermittels verbunden ist, um je nach atmosphärischer Störung ein digitales Signal bereitzustellen;
    wobei die Vorrichtung dadurch gekennzeichnet ist, dass der Mikroprozessor programmiert ist, um als Reaktion auf das Erfassen des vom Umwandler bereitgestellten digitalen Signals dem negativen Eingang des ersten Vergleichers, dessen Impulse eine variable Länge aufweisen, die je nach Dauer und Ausmaß der atmosphärischen Störung derart wächst, dass die Schwelle zum Auslösen der Alarmvorrichtung automatisch erhöht wird und folglich ihre Empfindlichkeit verringert wird, wenn der Atmosphärensensor die atmosphärische Störung erfasst, ein digitales Signal bereitzustellen.
  2. Vorrichtung gemäß Anspruch 1, wobei Mittel zur Pulsumwandlung (36, 38), die mit dem negativen Eingang des ersten Vergleichers (34) verbunden sind, ein Signal, dessen Spannung je nach zeitabhängiger Länge der Impulse von variabler Länge variiert, bereitstellen.
  3. Vorrichtung gemäß Anspruch 2, wobei die Mittel zur Pulsumwandlung einen Kondensator (38) umfassen, der durch die Impulse von variabler Länge mittels eines Widerstands (36) geladen wird, um die Impulse von variabler Länge in ein Spannungssignal, dessen Wert proportional zu ihrer zeitabhängigen Länge ist, umzuformen.
  4. Vorrichtung gemäß einem der Ansprüche 1 bis 3, wobei der Analog-Digital-Umwandler (24) eine Bitkonfiguration bereitstellt, die der Störung zugehört, und der Mikroprozessor (26) programmiert ist, um dem negativen Eigang des ersten Vergleichers (34) je nach dieser Konfiguration ein Signal zur Erhöhung der angelegten Spannung bereitzustellen.
  5. Vorrichtung gemäß einem der Ansprüche 1 bis 3, wobei der Analog-Digital-Umwandler ein zweiter Vergleicher (24) ist, der Impulse von variabler Länge je nach Ausmaß der atmosphärischen Störung bereitstellt.
  6. Vorrichtung gemäß einem der Ansprüche 1 bis 5, wobei die Alarmmittel den Mikroprozessor (26), der zum Bereitstellen eines Spannungssignals (S6) als Reaktion auf das Alarmsignal, dessen zeitabhängige Länge eine vorbestimmte Schwelle überschreitet, programmiert ist, und ein Alarmmittel (28), das zur Erfassung des Spannungssignals aktiviert wird, umfassen.
  7. Vorrichtung gemäß Anspruch 6, wobei das Alarmmittel (28) unterschiedlich aktiviert wird, je nachdem, ob die Größe des Alarmsignals zwischen einem Minimalwert und einem Maximalwert liegt, was anzeigt, dass ein Einbruchsversuch oder Aufprall stattgefunden hat, oder ob die Größe über dem Maximalwert liegt, was anzeigt, dass ein Einbruch stattgefunden hat.
  8. Vorrichtung gemäß einem der Ansprüche 1 bis 7, wobei das zweite Verstärkermittel (14) einen Operationsverstärker (15) beinhaltet und aufgrund eines Potentiometers (22), das zwischen dem Erdschluss und dem negativen Eingang des Operationsverstärkers verbunden ist, im Verstärkungsgrad variabel ist, wobei die Regelung des Potentiometers vom Raum abhängt, in dem sich die Alarmvorrichtung befindet.
  9. Vorrichtung gemäß einem der Ansprüche 1 bis 8, wobei der Mikroprozessor (26), durch aufeinander folgende Anpassungen, die optimale Länge der Impulse von variabler Länge sucht, die bei der Initialisierung der Vorrichtung ein durch ein permanentes Signal (32) verwirklichtes unzeitiges Auslösen verursachen.
  10. Vorrichtung gemäß einem der Ansprüche 9, wobei der Mikroprozessor (26) periodische Neuanpassungen durchführt, indem er bei Nichtstattfinden eines Vorfalls oder beim Überprüfen, dass es sich nicht um ein unzeitiges Auslösen beim Testen der Empfindlichkeitesschwelle im Falle eines erfassten Vorfalls handelt, erneut die optimale Länge berechnet.
EP01936588A 2000-05-18 2001-05-18 Selbstgeregelte alarmvorrichtung mit geringem energieverbrauch Expired - Lifetime EP1287508B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0006360A FR2809215B1 (fr) 2000-05-18 2000-05-18 Dispositif d'alarme autoregule a tres faible consommation d'energie
FR0006360 2000-05-18
PCT/FR2001/001541 WO2001088870A1 (fr) 2000-05-18 2001-05-18 Dispositif d'alarme autoregule a tres faible consommation d'energie

Publications (2)

Publication Number Publication Date
EP1287508A1 EP1287508A1 (de) 2003-03-05
EP1287508B1 true EP1287508B1 (de) 2004-09-01

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Application Number Title Priority Date Filing Date
EP01936588A Expired - Lifetime EP1287508B1 (de) 2000-05-18 2001-05-18 Selbstgeregelte alarmvorrichtung mit geringem energieverbrauch

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EP (1) EP1287508B1 (de)
AT (1) ATE275279T1 (de)
AU (1) AU2001262464A1 (de)
CA (1) CA2407117A1 (de)
DE (1) DE60105289T2 (de)
ES (1) ES2228868T3 (de)
FR (1) FR2809215B1 (de)
PT (1) PT1287508E (de)
WO (1) WO2001088870A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2842933B1 (fr) * 2002-07-26 2004-11-19 F And F Internat Dispositif de detection de la chute d'un corps dans une piscine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2560701B1 (fr) * 1984-03-05 1987-04-17 Sogesec Sarl Detecteur d'acces a pression differentielle
US5084696A (en) * 1991-01-24 1992-01-28 Aritech Corporation Signal detection system with dynamically adjustable detection threshold
FR2694650A1 (fr) * 1992-08-04 1994-02-11 Frizet Christian Analyseur paramétrique en temps réel de choc et d'ouverture.
EP0726548B1 (de) * 1995-02-13 2004-07-21 Siemens Building Technologies AG Körperschallmelder zur Einbruchüberwachung
FR2770670A1 (fr) * 1997-11-03 1999-05-07 Omega Conception Et Systeme Procede et dispositif d'alarme utilisant une detection sonore basse frequence

Also Published As

Publication number Publication date
EP1287508A1 (de) 2003-03-05
CA2407117A1 (fr) 2001-11-22
DE60105289D1 (de) 2004-10-07
PT1287508E (pt) 2005-01-31
FR2809215A1 (fr) 2001-11-23
WO2001088870A1 (fr) 2001-11-22
ATE275279T1 (de) 2004-09-15
ES2228868T3 (es) 2005-04-16
AU2001262464A1 (en) 2001-11-26
FR2809215B1 (fr) 2004-09-10
DE60105289T2 (de) 2005-09-01

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