EP0898771B1 - Systeme electronique de detection d'intrusion destine a des environnements surveilles - Google Patents

Systeme electronique de detection d'intrusion destine a des environnements surveilles Download PDF

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Publication number
EP0898771B1
EP0898771B1 EP97935552A EP97935552A EP0898771B1 EP 0898771 B1 EP0898771 B1 EP 0898771B1 EP 97935552 A EP97935552 A EP 97935552A EP 97935552 A EP97935552 A EP 97935552A EP 0898771 B1 EP0898771 B1 EP 0898771B1
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EP
European Patent Office
Prior art keywords
signal
alarm
sensor
output
control unit
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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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EP97935552A
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German (de)
English (en)
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EP0898771A1 (fr
Inventor
Luciano Trucchi
Giovanni Negro
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Tecno Alarm SNC
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Tecno Alarm SNC
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Publication of EP0898771A1 publication Critical patent/EP0898771A1/fr
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    • 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
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/183—Single detectors using dual technologies

Definitions

  • the present invention relates to an electronic intrusion detection system for environments to be monitored.
  • the invention is concerned with an electronic remote surveillance device adapted to be employed in combination with monitoring apparatuses, alarm systems, fire alarm devices, antitheft systems, etc.
  • the volumetric sensors based on Doppler effect are substantially small-size radar devices operating in the microwaves spectrum, typically 1-10 GHz, capable of detecting a person moving even at an extremely low speed.
  • the infrared volumetric sensors are sensors capable of detecting a temperature difference caused by the passage of a human body in the environment in which the sensors are located, but these sensors cannot detect mechanical vibrations.
  • volumetric sensors In presence of a body moving inside the environment or the space to be monitored, the above mentioned volumetric sensors generate an electric signal that can be applied to a control circuit that in turn actuates alarm warning devices or other devices that draw attention to the event by means of acoustic and/or optical (visual) alarm messages.
  • the acoustic and/or visual signal generated by the sensor(s) is converted into an alarm message and generally transmitted through a radio link or on a telephone line, either public or private, to a receiving device that can be located far away from the monitored place at which the event detection occurred.
  • the alarm message can be sent either to a receiving device located in a central control unit manned by private personnel or by policemen, or to a fixed or mobile telephone set, furnished to the surveillance personnel or even to the owner of a house.
  • the alarm message received through said devices can incorporate information relating to the place at which the event took place, such as for example a predetermined recorded vocal message.
  • the person in charge of the surveillance When the person in charge of the surveillance receives such alarm message from a monitored environment, he/she can either directlly intervene or arrange for proper actions, such as for example the request for a police intervention.
  • One of the main inconveniences of the known alarm systems using volumetric sensors that transmit alarm messages to a remote control unit is that the surveillance personnel - or more generally the person that receives such alarm message - is not in condition to discriminate a false alarm caused by a disturbance from a real alarm situation in which a quick intervention is required.
  • infrared sensors When infrared sensors are used in a monitoring system, many disturbing sources such as natural or artificial light sources, quick changes of temperature, e.g. caused by room convectors, sudden raise of the environment lighting due for example to the front lights of a passing car, are all capable of being detected by the sensors and generating (false) alarm signals. Moreover, the sensibility of infrared sensors decreases when the environment temperature increases.
  • the alarm message received at the remote location does not contain information allowing the personnnel in charge to decide with certainty whether it is due to a real or a false alarm
  • such monitoring systems suffer from several drawbacks, such as delayed interventions, or unnecessary interventions, with a reduction of the system reliability.
  • the owner of a dwelling that is far from home has to decide whether to ask for an intervention, or inform the police, or simply disregard the message as a false alarm, only on the base of a generic alarm message he/she has received.
  • One of the suggestions was to adjust the threshold level of the sensors to different conditions of the environment disturbances, another provided for pulse counters that actuated an alarm signal only after receiving a predetermined number the sensor detections, more likely to be caused by the presence of an intruder moving within the protected enclosure.
  • Still another device provided for using a combination of Doppler and infrared sensors both of which had to be activated before an alarm message was generated.
  • FR-A-2 611 290 One of such devices is disclosed in FR-A-2 611 290 concerning an alarm device capable of transmitting an alarm message.
  • the device illustrated and described in FR-A-2 611 290 comprises a volumetric sensor that upon being activated actuates a telephone dialing device the emits a predetermined stored number and transmits an alarm message through a telephone line.
  • an environment hearing is started through a microphone that allows the remote listening of the sounds and noises within the monitored space.
  • the remote listening through microphones requires the installation of additional devices in the rooms to be monitored and does not allow the listening of low intensity noises, such as those caused by slow movements.
  • a further object of the present invention is to realize an intrusion detection system that is both reliable and easy and inexpensive to install and to use.
  • the system generally comprises a number of volumetric sensors 1a, 1b, 1c that can be positioned in the environment(s) to be monitored in accordance with different patterns, such as one sensor for each room or two or more properly arranged sensors inside each (or a single) room to be monitored to increase the area kept under surveillance, in accordance with known techniques.
  • the volumetric sensors 1a, 1b and 1c can be either infrared sensors or sensors detecting the frequency shift caused by Doppler effect, hereinafter referred to as Doppler sensors.
  • infrared sensors When a human body passes through their detection range, infrared sensors generates a change in their output voltage signal, whereas Doppler sensors generates a frequency change in the reflected signal (generated by a not shown source) that is proportional to the speed and to the direction of the movement.
  • each node 3a, 3b, 3c is connected both to the input of an alarm generating circuit 10a, 10b and 10c, enclosed in a dashed box in the Figure, and to the input of a transducer or conversion circuit 20a, 20b and 20c, enclosed in a dash-and-point box in the Figure.
  • Each of the alarm circuits 10a, 10b and 10c outputs an alarm signal ALARM having a suitable voltage level when a predetermined alarm condition is met.
  • each of the alarm circuits 10a, 10b and 10c comprises a threshold detector (11a, 11b, 11c) connected a trigger circuit (12a, 12b, 12c) that actuates a relay (13a, 13b, 13c) or similar device that generates the alarm signal.
  • the corresponding relay 13a (13b, 13c) that is actuated by the trigger circuit 12a (12b, 12c) driven by the threshold detector 11a (11b, 11c) supplies the alarm signal from said alarm circuit 10a (10b, 10c).
  • the corresponding relay 13a, 13b and 13c switches from a rest condition to an alarm condition and enables an alarm signal or message to the transmitted to the respective alarm input 31a, 31b, 31c of an alarm control unit 30 through an alarm signal transmission line 14a, 14b, 14c.
  • a multiplexer or switch 32 provided in the alarm control unit 30, receives an ALARM signal having a proper logic level, e.g. 5 V for indicating a logic one, and about 0 V for indicating a logic zero, this signal representing the state of the sensor 1a or 1b or 1c that generated the alarm signal.
  • the conversion or transducer circuit 20a,- 20b and 20c comprises a voltage controlled oscillator or VCO 21a, 21b, 21c respectively, whose oscillation range is maintained in the (audio) frequency band from 300 Hz to 3,000 Hz corresponding to the telephone speech band, and a modulating circuit 22a, 22b, 22c respectively.
  • the amplified signal from the volumetric sensor 1a (1b, 1c) is used to drive the voltage controlled oscillator or VCO 21a (21b, 21c) and the output audio-frequency signal from the VCO is modulated in a modulating circuit 22a (22b, 22c) before being transmitted, on a transmission line for audio signals 23a (23b, 23c), to a demodulator 33a (33b, 33c) provided in the control unit 30.
  • any modification of the electric output from the sensors 1a, 1b, 1c is continuously converted into an audio signal, i.e. a signal that can be perceived (in the present case, heard) by a human being.
  • This audible signal is correlated with the monitored environment, i.e. contains information about what's happening within the monitored space.
  • this audible signal is a sort of "audio" picture of the thermal pattern changing in the monitored space.
  • this audible signal "represents" the motions occurring within the monitored space. In both cases the listener can easily distinguish the audio signals caused by an intrusion from those caused by disturbances, such as temporary phenomena or periodic sounds such as those produced by a banging door.
  • the output (audio) signal from demodulator 33a, 33b, 33c is applied to a corresponding input channels 34 of the multiplexer 32 the output of which is connected to an audio amplifier 40.
  • Each of the input channels 34 to the multiplexer 32 can be enabled to reach the audio amplifier 40 by a logic. address fed to one of the addressing inputs 35 of the multiplexer 32, connected to the outputs of the relay 13a, 13b, 13c, respectively.
  • the multiplexer 32 Through the multiplexer 32, one or more of the multiplexed audio signals are applied to the audio amplifier 40 the output of which feeds a telephone dialing device 41 (actuated by the alarm message) for the transmision on a public telephone line 43.
  • the audio signals signal can be received by any selected telephone set 42 or equivalent receiving device available to the surveillance personnel.
  • the alarm signal ALARM activates the telephone dialing device 41 for the setting up the connection with the receiving telephone set 42, and then the same signal enables the transmission along the telephone line 43 of an audio signal that is proportional to the activity detected by the volumetric sensor 1a, 1b, 1c.
  • the above audio signal can be directly applied to a (not shown) loudspeaker disposed in the audible range of-the surveillance personnel, such as for example the caretaker of a museum or other premises.
  • each signal generated by the volumetric sensors is converted into a form adapted to drive a display visible to the surveillance personnel, such as a CRT monitor, e.g. connected to the other end of the telephone line 43 and capable of visually representing the movements taking place in the monitored space, e.g. by changing the images shown.
  • a display visible to the surveillance personnel such as a CRT monitor, e.g. connected to the other end of the telephone line 43 and capable of visually representing the movements taking place in the monitored space, e.g. by changing the images shown.
  • Such representation is not the visual display of a television camera, but is nevertheless capable of allowing an easy and positive discrimination between an intrusion and other phenomena.
  • the signal generated by the volumetric (Doppler or infrared) sensor 1a (1b, 1c) is directly applied to the relay 13a (13b, 13c) which relay is generally incorporated in the same housing of the sensor.
  • This embodiment is schematically shown in Fig. 1 by the dashed line connection between the output of amplifier 2a (2b, 2c) and the relay.
  • the so obtaind pulse signal has a period that is proportional to the relay opening/closing cycle, and therefore is representative of the detection activity of the volumetric sensor, but is more "clean" (that is contains less spurious signals) in respect of a signal directly coming from the sensor.
  • the above embodiment of the invention has further the advantage of a simpler construction since the transmission line 14a, 14b, 14c - provided for sending the ALARM signal - can be used also for transmitting the signal from the unit containing the volumetric sensor and the relay to the alarm control unit 30.
  • the analysis for detecting when the threshold has been exceeded i.e. an alarm condition
  • the relays 13a, 13b, 13c are advantageously formed by solid state relays that are more suitable to be continuously closed and opened at a high rate.
  • the signal transmitted on audio transmission line 23a (23b, 23c) to the control unit 30 is continuously stored in a memory device provided for in this unit.
  • a memory device is a solid state memory capable of continuously storing an interval or "frame" of the signal.
  • unit 30 will contain a plurality of memory devices, each one for storing the signal from one of the sensors located in the monitored environment.
  • the stored signal can be transmitted along the telephone line to the surveillance personnel immediately after the trasmission of an ALARM signal that has warned the personnel of a possible alarm condition. Since the signal that caused the alarm has been stored, the surveillance personnel will have the additional possibility of listening to the signal - converted into audible form - that caused the alarm. However, once the stored signal has been transmitted, the system will start to transmit the current or real time signal so that the personnel can monitor what is happening in the monitored environment.
  • the movements can be displayed even without triggering any alerting signal, by sequentially enabling the channels of multiplexer 32, either manually or electronically.
  • the invention is applicable in the field of the alarm and antitheft systems for protecting civil dwellings and industrial premises from intrusion through a remote surveillance.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Emergency Alarm Devices (AREA)
  • Paints Or Removers (AREA)
  • Cable Accessories (AREA)

Claims (14)

  1. Système électronique de détection d'intrusion destiné à au moins un environnement surveillé, comprenant :
    au moins un capteur électronique (1a, 1b, 1c) sensible aux mouvements se produisant dans ledit environnement et capable de modifier au moins une des caractéristiques significatives de son signal électrique de sortie en réponse à la présence d'un corps se déplaçant dans ledit environnement surveillé ;
    au moins un premier circuit d'alarme (10a, 10b, 10c) connecté audit capteur et capable de générer un signal d'alarme (ALARM) lorsque ladite modification remplit une condition prédéterminée.
    et une unité de commande du système d'alarme (30) conçue pour recevoir ledit signal d'alarme (ALARM) ;
       caractérisé en ce que ledit système comprend des moyens formant transducteur supplémentaires (20a, 20b, 20c) pour convertir de manière continue ladite modification de la sortie dudit capteur électrique (1a, 1b, 1c) en un signal qui peut être perçu par un être humain, ledit signal perceptible étant transmis à l'unité de commande du système d'alarme (30).
  2. Système selon la revendication 1, caractérisé en ce que lesdits moyens formant transducteur (20a, 20b, 20c) permettant d'assurer la conversion continue de ladite modification de la sortie provenant du capteur électrique (1a, 1b, 1c) en un signal qui peut être perçu par un être humain comprennent un générateur de fréquence (21a, 21b, 21c) commandé par lesdites caractéristiques modifiées du signal électrique de sortie provenant dudit capteur (1a, 1b, 1c) et un transducteur acoustique situé dans la gamme des fréquences audibles pour le personnel de surveillance.
  3. Système selon la revendication 2, caractérisé en ce que ledit générateur de fréquence (21a, 21b, 21c) comprend un générateur audiofréquence.
  4. Système selon la revendication 3, caractérisé en ce que ledit générateur audiofréquence (21a, 21b, 21c) comprend un oscillateur commandé par tension ou VCO, la fréquence du signal généré par ledit oscillateur (21a, 21b, 21c) étant comprise entre 300 et 3 000 Hz.
  5. Système selon les revendications précédentes, caractérisé en ce que lesdits moyens formant transducteur (20a, 20b, 20c) comprennent en outre un circuit de démodulation 22a (22b, 22c).
  6. Système selon les revendications précédentes, caractérisé en ce que lesdits circuits d'alarme (10a, 10b, 10c) sont connectés à ladite unité de commande du système d'alarme (30) par des lignes de transmission de signaux (14a, 14b, 14c) et en ce que ladite unité de commande du système d'alarme (30) comprend des moyens de démodulation (33a, 33b, 33c) et des entrées d'alarme (31a, 31b, 31c).
  7. Système selon les revendications précédentes, caractérisé en ce que ladite unité de commande du système d'alarme (30) comprend un dispositif de commutation ou un multiplexeur (32) possédant une pluralité de canaux d'entrée (34), chacun transportant le signal audiofréquence obtenu à partir de l'un desdits moyens transducteurs (20a, 20b, 20c) et une pluralité d'entrées d'adresse (35), chacune étant reliée à l'une desdites entrées d'alarme (31a, 31b, 31c) pour permettre auxdits moyens de commutation (32) de produire les signaux audiofréquence associés à un signal d'alarme.
  8. Système selon les revendications précédentes, caractérisé en ce que la sortie dudit dispositif de commutation (32) est connectée à un amplificateur (40), dont la sortie alimente un dispositif de téléphone automatique (41) pour la transmission des signaux d'alarme et des signaux audiofréquence via une ligne téléphonique (43) vers un poste téléphonique récepteur (42).
  9. Système selon les revendications précédentes, caractérisé en ce que ledit au moins un capteur (1a, 1b, 1c) est sélectionné parmi le groupe de capteurs infrarouge, de capteurs d'effet Doppler ou une combinaison de ceux-ci.
  10. Système selon les revendications précédentes, caractérisé en ce que la sortie dudit capteur volumétrique (1a, 1b, 1c) est directement couplée audit relais (13a, 13b, 13c), moyennant quoi le signal devant être modulé est généré par les ouvertures et fermetures successives dudit relais (13a, 13b, 13c) entraínées par le signal provenant dudit capteur volumétrique (1a, 1b, 1c).
  11. Système selon la revendication 10, caractérisé en ce que ledit relais (13a, 13b, 13c) est enfermé dans la même unité logeant ledit capteur (1a, 1b, 1c) et le signal de ladite unité est transmis à l'unité de commande du système d'alarme (30) le long de la même ligne de transmission (14a, 14b, 14c) prévue pour envoyer ledit signal d'alarme (ALARM).
  12. Système selon les revendications précédentes, caractérisé en ce que le signal transmis sur ladite ligne de transmission audio (23a, 23b, 23c) vers ladite unité de commande (30) est stocké en continu dans au moins une mémoire dans ladite unité de commande (30).
  13. Système selon la revendication 12, caractérisé en ce que chacune desdites mémoires est une mémoire à semi-conducteurs capable de stocker en continu un intervalle ou une "trame" du signal, et il est prévu une mémoire pour stocker le signal de chaque capteur situé dans l'environnement surveillé.
  14. Système selon la revendication 1, caractérisé en ce que lesdits moyens formant transducteur (20a, 20b, 20c) servant à convertir en continu ladite modification de la sortie provenant du capteur électrique (1a, 1b, 1c) en un signal qui peut être perçu par un être humain comprennent un générateur de fréquence (21a, 21b, 21c) commandé par lesdites caractéristiques modifiées du signal électrique de sortie provenant dudit capteur (1a, 1b, 1c) et une unité d'affichage destinée au personnel de surveillance.
EP97935552A 1996-12-24 1997-07-30 Systeme electronique de detection d'intrusion destine a des environnements surveilles Expired - Lifetime EP0898771B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT96TO001080A IT1289800B1 (it) 1996-12-24 1996-12-24 Dispositivo elettronico di controllo ambientale.
ITTO961080 1996-12-24
PCT/EP1997/004142 WO1998028724A1 (fr) 1996-12-24 1997-07-30 Systeme electronique de detection d'intrusion destine a des environnements surveilles

Publications (2)

Publication Number Publication Date
EP0898771A1 EP0898771A1 (fr) 1999-03-03
EP0898771B1 true EP0898771B1 (fr) 2002-09-04

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Application Number Title Priority Date Filing Date
EP97935552A Expired - Lifetime EP0898771B1 (fr) 1996-12-24 1997-07-30 Systeme electronique de detection d'intrusion destine a des environnements surveilles

Country Status (11)

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EP (1) EP0898771B1 (fr)
AT (1) ATE223606T1 (fr)
AU (1) AU727852B2 (fr)
CA (1) CA2242870C (fr)
CZ (1) CZ293095B6 (fr)
DE (1) DE69715183D1 (fr)
HU (1) HU222942B1 (fr)
IT (1) IT1289800B1 (fr)
PL (1) PL184165B1 (fr)
WO (1) WO1998028724A1 (fr)
ZA (1) ZA976988B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106781163A (zh) * 2017-01-04 2017-05-31 四川友邻有家电子商务有限公司 门店语音报警系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2012327B1 (en) 2013-12-13 2016-06-21 Utc Fire & Security B V Selective intrusion detection systems.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064189A (en) * 1979-11-09 1981-06-10 Ascotts Ltd Surveillance System
FR2611290A1 (fr) * 1987-02-23 1988-08-26 Soulon Alain Perfectionnements apportes aux dispositifs de detection et de transmission d'alarme

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106781163A (zh) * 2017-01-04 2017-05-31 四川友邻有家电子商务有限公司 门店语音报警系统

Also Published As

Publication number Publication date
CZ293095B6 (cs) 2004-02-18
HUP9902390A3 (en) 2000-01-28
PL184165B1 (pl) 2002-09-30
HU222942B1 (hu) 2003-12-29
ZA976988B (en) 1999-04-16
ITTO961080A1 (it) 1998-06-24
CA2242870C (fr) 2003-02-18
PL328502A1 (en) 1999-02-01
AU3850097A (en) 1998-07-17
AU727852B2 (en) 2001-01-04
CZ268898A3 (cs) 1998-12-16
CA2242870A1 (fr) 1998-07-02
WO1998028724A1 (fr) 1998-07-02
EP0898771A1 (fr) 1999-03-03
DE69715183D1 (de) 2002-10-10
ATE223606T1 (de) 2002-09-15
HUP9902390A2 (hu) 1999-11-29
IT1289800B1 (it) 1998-10-16

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