EP1287508B1 - Dispositif d'alarme autoregule a tres faible consommation d'energie - Google Patents
Dispositif d'alarme autoregule a tres faible consommation d'energie Download PDFInfo
- 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
- Authority
- 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
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Classifications
-
- 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)
- Fire-Detection Mechanisms (AREA)
- Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
Description
Claims (10)
- Dispositif d'alarme comprenant un capteur de pression acoustique (10) fournissant un signal analogique d'une part à une premier moyen amplificateur (12) et d'autre part à un second moyen amplificateur (14), un premier comparateur (34) dont l'entrée positive est connectée à la sortie dudit second moyen amplificateur et dont la sortie fournit un signal d'alarme à un microprocesseur programmé (26) en cas d'effraction ou de tentative d'effraction, des moyens d'autorégulation réagissant à une perturbation atmosphérique telle que du vent de représentation sinusoïdale et comprenant un convertisseur analogique-numérique (24) dont l'entrée est connectée à la sortie dudit premier moyen amplificateur pour fournir en sortie un signal numérique en fonction de ladite perturbation atmosphérique ;
ledit dispositif étant caractérisé en ce que ledit microprocesseur est programmé pour fournir, en réponse à la détection dudit signal numérique fourni par ledit convertisseur, un signal numérique à l'entrée - dudit premier comparateur dont les impulsions ont une largeur variable qui croít en fonction de la durée et de l'importance de ladite perturbation atmosphérique de façon à augmenter automatiquement le seuil de déclenchement du dispositif d'alarme et donc diminuer sa sensibilité lorsque ledit capteur acoustique détecte ladite perturbation atmosphérique. - Dispositif selon la revendication 1, dans lequel des moyens de conversion d'impulsions (36, 38) connectés à l'entrée - dudit premier comparateur (34) fournissent un signal dont la tension varie en fonction de la largeur en fonction du temps desdites impulsion de largeur variable.
- Dispositif selon la revendication 2, dans lequel lesdits moyens de conversion d'impulsions comprennent un condensateur (38) chargé par lesdites impulsions de largeur variable par l'intermédiaire d'une résistance (36) pour transformer lesdites impulsions de largeur variable en un signal de tension dont la valeur est proportionnelle à leur largeur en fonction du temps.
- Dispositif selon l'une des revendications 1 à 3, dans lequel ledit convertisseur analogique numérique (24) fournit une configuration de bits associée à ladite perturbation et ledit microprocesseur (26) est programmé pour fournir un signal d'augmentation de la tension appliquée à l'entrée - dudit premier comparateur (34) en fonction de la dite configuration.
- Dispositif selon l'une des revendications 1 à 3, dans lequel ledit convertisseur analogique numérique est un second comparateur (24) fournissant des impulsions de largeur variable en fonction de l'importance de ladite perturbation atmosphérique.
- Dispositif selon l'une des revendications 1 à 5, dans lequel lesdits moyens d'alarme comprennent ledit microprocesseur (26) programmé pour fournir un signal de tension (S6) en réponse audit signal d'alarme dont la largeur en fonction du temps dépasse un seuil prédéterminé et un moyen d'alarme (28) activé à la détection dudit signal de tension.
- Dispositif selon la revendication 6, dans lequel ledit moyen d'alarme (28) est activé différemment selon que la largeur dudit signal d'alarme est comprise entre une valeur minimale et une valeur maximale indiquant qu'il y a eu tentative d'effraction ou choc ou que ladite largeur est supérieure à ladite valeur maximale indiquant qu'il y a eu effraction.
- Dispositif selon l'une des revendications 1 à 7, dans lequel ledit second moyen amplificateur (14) comporte un amplificateur opérationnel (15) et est à gain variable grâce à un potentiomètre (22) connecté entre la masse et l'entrée - dudit amplificateur opérationnel, le réglage dudit potentiomètre étant fonction du local dans lequel se trouve le dispositif d'alarme.
- Dispositif selon l'une des revendications 1 à 8, dans lequel ledit microprocesseur (26) recherche, par ajustements successifs, la largeur optimale desdites impulsions à largeur variable provoquant un déclenchement intempestif matérialisé par un signal (32) permanent lors de l'initialisation du dispositif.
- Dispositif selon la revendication 9 , dans lequel ledit microprocesseur (26) procède à des ré-ajustements périodiques en re-calculant ladite largeur optimale en l'absence d'incident ou en vérifiant qu'il ne s'agit pas d'un déclenchement intempestif en testant le seuil de sensibilité en cas d'incident détecté.
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 (fr) | 2003-03-05 |
EP1287508B1 true EP1287508B1 (fr) | 2004-09-01 |
Family
ID=8850369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01936588A Expired - Lifetime EP1287508B1 (fr) | 2000-05-18 | 2001-05-18 | Dispositif d'alarme autoregule a tres faible consommation d'energie |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1287508B1 (fr) |
AT (1) | ATE275279T1 (fr) |
AU (1) | AU2001262464A1 (fr) |
CA (1) | CA2407117A1 (fr) |
DE (1) | DE60105289T2 (fr) |
ES (1) | ES2228868T3 (fr) |
FR (1) | FR2809215B1 (fr) |
PT (1) | PT1287508E (fr) |
WO (1) | WO2001088870A1 (fr) |
Families Citing this family (1)
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)
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. |
DE59510930D1 (de) * | 1995-02-13 | 2004-08-26 | Siemens Building Tech 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 |
-
2000
- 2000-05-18 FR FR0006360A patent/FR2809215B1/fr not_active Expired - Fee Related
-
2001
- 2001-05-18 DE DE60105289T patent/DE60105289T2/de not_active Expired - Fee Related
- 2001-05-18 PT PT01936588T patent/PT1287508E/pt unknown
- 2001-05-18 WO PCT/FR2001/001541 patent/WO2001088870A1/fr active IP Right Grant
- 2001-05-18 AT AT01936588T patent/ATE275279T1/de not_active IP Right Cessation
- 2001-05-18 CA CA002407117A patent/CA2407117A1/fr not_active Abandoned
- 2001-05-18 AU AU2001262464A patent/AU2001262464A1/en not_active Abandoned
- 2001-05-18 ES ES01936588T patent/ES2228868T3/es not_active Expired - Lifetime
- 2001-05-18 EP EP01936588A patent/EP1287508B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60105289T2 (de) | 2005-09-01 |
FR2809215A1 (fr) | 2001-11-23 |
PT1287508E (pt) | 2005-01-31 |
ES2228868T3 (es) | 2005-04-16 |
EP1287508A1 (fr) | 2003-03-05 |
AU2001262464A1 (en) | 2001-11-26 |
WO2001088870A1 (fr) | 2001-11-22 |
CA2407117A1 (fr) | 2001-11-22 |
DE60105289D1 (de) | 2004-10-07 |
ATE275279T1 (de) | 2004-09-15 |
FR2809215B1 (fr) | 2004-09-10 |
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