EP0188165B1 - Procédé et dispositif de protection de locaux contre l'intrusion - Google Patents

Procédé et dispositif de protection de locaux contre l'intrusion Download PDF

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Publication number
EP0188165B1
EP0188165B1 EP19850420226 EP85420226A EP0188165B1 EP 0188165 B1 EP0188165 B1 EP 0188165B1 EP 19850420226 EP19850420226 EP 19850420226 EP 85420226 A EP85420226 A EP 85420226A EP 0188165 B1 EP0188165 B1 EP 0188165B1
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European Patent Office
Prior art keywords
signal
intercorrelation
signals
echos
building
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Expired - Lifetime
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EP19850420226
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German (de)
English (en)
French (fr)
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EP0188165A2 (fr
EP0188165A3 (en
Inventor
Bernard Allgeyer
Lionel Gaudriot
Alain Hellion
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Metravib SA
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Metravib SA
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Publication of EP0188165A3 publication Critical patent/EP0188165A3/fr
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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
    • 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
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems

Definitions

  • the subject of the present invention is a method of protecting premises against intrusion, according to which an acoustic signal is emitted inside a room to be monitored and the variations of the reflected acoustic signals are analyzed to detect an intrusion into the room. .
  • the invention also relates to a device for protecting premises against intrusion, comprising at least one transmitter of acoustic signals and at least one detector of reflected acoustic signals, arranged in the room to be protected, as well as a processing assembly. of signals to which are applied, on the one hand, the signals emitted by the transmitter and, on the other hand, the reflected signals picked up by the detector (s).
  • the known volumetric protection methods are generally based on the use of microwave radiation or sonic or ultrasonic acoustic waves.
  • microwave radiation makes it possible, using the Doppler effect, to detect movements and to measure the speeds of movement of objects or people in the field of the monitored area.
  • microwave radiation passes through the walls of the premises, which makes this type of detection unreliable in many circumstances where disturbing phenomena outside the premises to be protected risk being taken into account by the detection system.
  • the patent US Pat. No. 3,406,385 also describes a system for monitoring premises against intrusion consisting in emitting a signal, audible or ultrasonic, inside the premises and in analyzing the reflected signals to determine a variation of the reverberation time of the room under reference conditions. This system detects a change in the output level of an integrator circuit receiving the signals from the sensor detecting the reflected signals.
  • ultrasonic detection systems are sensitive to acoustic phenomena caused, for example, by fluids circulating in pipes or by local temperature rises.
  • the ultrasonic waves have a short wavelength which promotes the triggering of false alarms by movements of small objects or animals.
  • the present invention thus aims to remedy the drawbacks of the above systems and, in particular, to allow rapid detection of intruders entering a room, while limiting the risk of false alarms due, for example, to the presence of small animals or extraneous noise.
  • the acoustic waves emitted comprise pulse trains modulated linearly in frequency in a band comprised between approximately 1 kHz and 3 kHz for a duration comprised between approximately 10 and 15 milliseconds.
  • the detection of the echoes of the reflected signal has, due to the intercorrelation with the transmitted signal, excellent immunity to outside noise and a high signal-to-noise ratio.
  • a transmission signal constituted by a train of pulses linearly modulated in frequency, ensures a high spectral energy density and a short analysis time.
  • the frequency band used for the pulse train corresponds to wavelengths on the order of dimensions of the human body, which reduces false alarms due to small objects or animals and increases the chances of detection of 'an intruder.
  • the frequency band adopted exhibits good detection selectivity and the duration of the train of pulses which has been selected makes it possible to obtain good temporal compression of the signal.
  • the period of recurrence of the emission of the pulse trains is of the order of 1 to 3 seconds, that is to say is greater than the usual reverberation time of the premises to be protected, while allowing an analysis complete of the signals emitted and reflected between two successive emissions of pulse trains.
  • the theoretical primary and secondary echoes to be reflected by the walls of the room to be protected are determined beforehand, as a function of the location of the transmitter of the acoustic signal and of the detector (s). of acoustic signals reflected by the room and the recognized echoes corresponding to theoretical echoes are identified on the pre-recorded reference signal.
  • an alarm is suspended until 'taking into account a predetermined number, greater than two, of disappearances or attenuations of echoes not recognized with respect to the reference signal, for a predetermined number greater than two, of acquisitions of intercorrelation signals analyzed.
  • one proceeds, periodically, at time intervals much greater than the recurrence frequency, to the acquisition and recording of a new reference signal.
  • the faults due for the echoes at a difference in value less than a predetermined threshold, corresponding to a determined percentage of the amplitude of the considered echo of the reference signal are not taken into account for the triggering of an alarm.
  • the time offset of each echo is measured between two or more successive analyzes and, in the event of a shift remaining substantially stable, information corresponding to a change in the physical characteristics of the atmosphere of the room to be protected.
  • a specific non-operation alarm is triggered in the event of the disappearance or appearance of echoes in numbers greater than a predetermined value, for one or more acquisitions of intercorrelation signals analyzed.
  • the subject of the invention is also a protection device of the type defined at the head of the description, characterized in that the acoustic signal transmitter comprises a generator of pulse trains modulated linearly in frequency and an omnidirectional loudspeaker for broadcasting in the room, said pulse trains, in that the acoustic signal detector comprises at least one microphone and means for conditioning the signals received by the microphone and in that the signal processing assembly comprises intercorrelation means acoustic signals emitted by the transmitter and received by the detector to provide an intercorrelation signal, means for analyzing the envelope of the intercorrelation signal and recognizing echoes, means for comparing the signal of intercorrelation and a reference signal having a predetermined number of echoes characteristic of the room to be protected and of the counting and re detection of echoes that have appeared or disappeared in the intercorrelation signal and in that means for triggering an alarm are controlled by said means for counting and tracking of echoes that have disappeared or have appeared, according to a programmed decision logic strategy.
  • the signal processing assembly comprises means for sampling the acoustic signals emitted by the transmitter and received by the detector and means intercorrelation of the sampled transmitted and received acoustic signals to provide said intercorrelation signal.
  • pre-alarm means are interposed between the means for counting and locating missing or appeared echoes so as to control the triggering means only in the event of repeated recognition of disappearances or appearances of echoes according to a programmed sequential logic.
  • the protection device comprises several acoustic signal detectors distributed in the room to be protected and each connected to the signal processing assembly which includes means for summing the signals received by the different detectors, means for sampling the acoustic signals emitted by the transmitter and summed signals received by the various detectors, means for intercorrelating the sampled transmitted signals and summed and sampled reception signals corresponding to all of the various detectors to provide for the set of detectors an intercorrelation signal, means for analyzing the envelope of the intercorrelation signal and recognizing echoes, means for comparing the intercorrelation signal of all the various detectors and a reference signal also corresponding to all of the various detectors and having u n predetermined number of echoes characteristic of the room to be protected and of the means of counting and locating echoes that have appeared or disappeared in the intercorrelation signal corresponding to all the detectors.
  • the transmitter and the detectors are arranged so that at least the acoustic rays linked to the theoretical primary and secondary echoes reflected by the walls of the room to be protected constitute a well distributed beam in the directions that are likely to be 'intercept an intruder. These rays must, in particular, have an angle between them greater than about 15 °.
  • FIG. 1 an example of a room having the shape of a six-sided parallelepiped: a front face 1, a rear face 3, two lateral faces 2 and 4, a lower face 6 and an upper face 5.
  • an acoustic signal transmitter 10 is arranged, constituted for example by an omnidirectional loudspeaker and two acoustic signal receivers D 1 , D 2 constituted by microphones.
  • the location of the transmitter 10 and of the receivers D 1 ' D 2 depend on the particular characteristics of the room to be protected. Knowing the geometric configuration of the room to be protected, it is possible to determine by calculation the different theoretical paths of the sound waves from the transmitter to the different receivers, after primary and secondary reflections on the different walls of the room.
  • FIGS. 2 to 4 different theoretical paths of sound waves from a sound source 10 to a receiver D 1 taking into account primary and secondary reflections on the different walls of the room.
  • the secondary reflections we do not take into account those which correspond to rays which are not presumed to be cut by an intruder and those which present the longest paths, if the length, width and height of the volume are not too different.
  • the sound wave paths in the case of figs. 2 to 4, were established by way of example for a room of length 8.38 m, width 3.93 m and height 2.70 m, with, for the sound source, the first sensor D l and the second sensor D 2 , the following coordinates in the reference frame Ox, yz, represented in FIG. 1:
  • a primary echo on side 4 will be designated by 4-4 and a secondary echo on sides 5 and 1 will be designated by 5-1.
  • the method of protecting premises against intrusion is based, according to the invention, essentially on the analysis of the modifications of the sound echoes recorded by the detectors D "D 2 for the same emission signal.
  • This is the reason for which the transmitter 10 and the detectors D i , D 2 , must be positioned inside the room, so that there is a minimum of overlapping echoes, that is to say that it there is a minimum of sound waves whose path has a similar length.
  • the paths of the emitted and reflected acoustic waves have an angle of between approximately 15 and 30 °.
  • the number of detectors must also be adapted in the room, so that there is a minimum of gray areas in which an intruder would not cut the path of a sound wave. With a number of detectors between two and four, we can consider a good detection security in most of the cases.
  • the detection of the presence of an intruder in a room is thus done by analysis of the echoes of an acoustic signal. From a sound wave sent to a room by a transmitter 10, we control the echoes returned by the walls 1 to 6 and picked up by detectors D i , D 2 . These echoes are modified if there is an intruder. Thanks to the recognition of a certain number of echoes, corresponding to theoretical echoes due to primary and secondary reflections on the walls of the room, it is possible to locate an intruder and follow its movement inside the room.
  • the analysis of the echoes returned by the walls can, in fact, be done fairly quickly compared to the normal speed of progression of an individual in an unknown place, that is to say in a time that can range from around 1 to 3 seconds. There is thus, at the end of each analysis, that is to say for example every second, the result of the diagnosis characterizing the state of the room.
  • the acoustic wave emitted by the transmitter 10 is constituted by trains of pulses modulated linearly in frequency in a band B between, approximately, 500 Hz and 5 kHz, during a limited duration T of between approximately 5 and 20 ms, with a recurrence period at least of the order of the reverberation time of the room to be protected.
  • the frequency band B of the pulse train is preferably between approximately 1 and 3 kHz, to achieve the desired resolution linked to the temporal separation of the echoes, and the duration T of the pulse train is preferably between 10 and 15 ms.
  • the product Bx T be much greater than 1, in order to achieve, by treatment, a satisfactory signal / noise ratio in realistic acoustic atmospheres.
  • FIG. 5 the form of the signal S transmitted.
  • This signal has a high energy spectral density and allows a short analysis time, given its limited duration.
  • the frequency band chosen is adapted, by the acoustic wavelength corresponding to the detection of human intruders, while avoiding false alarms which would be due to intruders of small dimensions, such as small animals.
  • the form of the signal received by a detector D, or D 2 is shown in FIG. 6.
  • this signal S ' is naturally delayed in time with respect to the transmitted signal S and has a certain number of points corresponding to echoes on the various faces of the room.
  • the echoes are more or less attenuated and offset in time, depending on the length of the sound wave path.
  • the duration of the signal received S ′ is taken into account voluntarily, for example to a duration of the order of 40 to 100 ms and, preferably, close to 50 ms, in order to eliminate the echoes too delayed in time and too muted corresponding, for example, to tertiary or higher order reflections in the room.
  • the period of recurrence of the pulse trains of signal S is advantageously of the order of 1 to 3 s. Such a value is, in general, greater than the reverberation time of the room and reserves sufficient time for the analysis of the signals transmitted S and received S '.
  • the detection of echoes in the received signal is done by intercorrelation of the received signal with the transmitted signal.
  • intercorrelation signal G ss ' produced by intercorrelation of the signals S and S' and highlighting the echoes E ,.
  • the intercorrelation signal G ss thus corresponds, for the various echoes E l spread over time, to a series of autocorrelation functions of width ⁇ 1 / B which defines the spatial resolution of the detection.
  • B 2 kHz
  • 1 / B 0, 5 ms and then the spatial resolution is 17 cm.
  • the intercorrelation signal is sampled.
  • the signal G ss can thus be scanned on, for example, 512 points sampled at 10 kHz. This corresponds to a sequence of echoes with a duration of 51.2 ms and makes it possible to monitor a sphere of 9 m radius centered on the emitter of sound signals 10.
  • other numerical values can be chosen, in order to adapt the protection to the dimensions of the room to be monitored.
  • each intercorrelation signal obtained is compared with a reference signal which has itself been formed by an "empty" intercorrelation. "that is to say in the room without the presence of the intruder and results from the intercorrelation carried out under the reference conditions between a basic signal emitted S and a signal received S 'by the detector (s) D 1 , D 2 .
  • the reference signal is processed in such a way that each echo it contains is recognized and, for some, that the rays which carry them are identified.
  • the result of this processing which consists of a time sequence, is stored in memory and will be used later for comparison with the intercorrelation signals produced when the monitoring device is in action.
  • Figs. 8a and 8b represent, for the sensors D 1 and D 2 of FIG. 1, the distribution over time of the different theoretical echoes that each of these sensors must receive for a predetermined period after primary and secondary reflections on the various faces of the room to be protected.
  • the different theoretical echoes E have been identified by the numbers of the planes on which the reflections leading to the formation of an echo have occurred.
  • fig. 9 represents the envelope b of the intercorrelation function prepared from the signal emitted by the transmitter 10 and the signal received by a detector D l under the reference conditions, without the presence of an intruder.
  • This envelope b in combination with the information relating to the theoretical echoes E l of a sequence c of theoretical echoes, corresponding to a location of the detector D 1 which causes a minimum of overlap of the various theoretical echoes E i , makes it possible to develop a reference sequence S R which involves the counting and identification of all the echoes whose energy exceeds a predetermined energy threshold a and the recognition among these echoes of those whose position in the time scale, that is to say the delay, corresponds to a theoretical echo of the series c.
  • the reference signal S R of FIG. 9 thus comprises, by way of example, 9 recognized theoretical echoes E, R identified by the numbers of the reflecting planes 5 ⁇ 5.1 ⁇ 1.6 ⁇ 6, 5 ⁇ 1, 1 ⁇ 2, 6-3, 2 ⁇ 3, 4 ⁇ 4, 5 ⁇ 4.
  • the reference signal includes ten other unrecognized echoes, that is to say exceeding the predetermined energy threshold a, but whose delays do not correspond exactly to those of theoretical echoes.
  • These echoes, present in the reference signal S R but not identifiable by a theoretical echo, are simply designated by the indices 0-0.
  • the echoes present in the reference signal can correspond, for example, to reflections on furniture or other objects present in the room to be monitored and which are therefore possibly likely to be modified over time, when, for example, an object is moved, while the theoretical echoes identified, which are due to reflections on the walls of the room, must, in principle, remain immutable.
  • the reference signal is saved in a memory, so that it can be used as a based on a comparison with the cross-correlation signals which will then be produced periodically.
  • Fig. 10 shows such a cross-correlation function envelope of a transmitted signal and a received signal which manifests the presence of an intruder.
  • the envelope of the intercorrelation function d in FIG. 10 is treated in combination with the sequence c of theoretical echoes E ,.
  • the different recognized theoretical echoes E IR and the different unrecognized echoes E, o are compared with those of the reference signal S R , in order to determine whether recognized or unrecognized echoes have disappeared or , on the contrary, appeared.
  • the research is in fact carried out, preferably, from the most energetic echoes, that is to say from the echoes least delayed in time.
  • an echo is considered to have disappeared if its attenuation relative to the corresponding echo of the reference signal is greater in percentage than a predetermined value compared to the echo of the signal of reference.
  • a test is also carried out, with the aim of determining whether the number of echoes appeared or disappeared is not greater to a predetermined value corresponding, for example, to more than half of the echoes present in the reference signal S R.
  • the protection device essentially comprises a transmitter 10 of acoustic signals and a set 20 for detecting reflected acoustic signals.
  • the signal transmitter 10 comprises one or more loudspeakers 11, suitably placed to insonate all the areas to be protected, taking into account the shape of the premises and of the objects, furniture, equipment, storage placed there.
  • the detection device 20 comprises a sensor assembly 21 consisting of one or more microphones distributed along the various paths of direct and reflected acoustic rays which one chooses to consider, using the mentioned mobilization, to ensure the density desired surveillance according to the described method for comparing the echoes collected.
  • a signal processing assembly 30 receives the signals transmitted by the transmitter (s) 10 (line 33), as well as the signals delivered by the detectors 21 (line 34). It will be noted that the various signals delivered by several sensors 21, in response to the emission of an acoustic signal by the loudspeakers 11, can be processed globally by the processing assembly 30. In this case, the reference signal is itself established by taking into account the analog sum of the signals delivered by the various microphones 21.
  • the signal processing assembly 30 furthermore controls, via line 35, the timing of the transmission of the various pulse trains by the transmitter 10.
  • An alarm device 40 is triggered by the assembly 30 signal processing via line 36.
  • the signal processing assembly 30 comprises a stage 31 which constitutes an interface for acquiring data and digitizing the information received by lines 33 and 34.
  • the signals delivered by the sensors 21 are applied to the interface 31 after amplification in amplifiers 22 and sounding in a buzzer 23.
  • Line 33 provides the reference signal of the transmitter.
  • the digital signals from the interface 31 are processed by a microprocessor 32.
  • the microprocessor 32 sends on line 35 a reset signal from a binary counter 121, of which the output is connected to a digital analog converter 122 which transforms the digital information coming from the binary counter 121 into a voltage which increases linearly as a function of time.
  • a voltage-frequency converter 123 is mounted at the output of the digital-analog converter 122 to transform the voltage signal into a sinusoidal signal of linearly variable frequency, like the input voltage, as a function of time.
  • An analog switch 124 is interposed between the voltage-frequency converter 123 and the amplifier 125.
  • the analog switch 124 cuts the signal emitted by the voltage-frequency converter after a predetermined duration T defined by a time-out circuit 126 connected to the binary counter 121.
  • the circuit 126 in fact ensures the adjustment of the duration of the pulse train T and of the recurrence period T R of the different pulse trains.
  • the analog switch 124 is thus closed as soon as the counter 121 is reset to zero, then is opened after a predetermined duration T and, finally, is closed again after the recurrence time T R corresponding to a new reset of the counter 121.
  • the binary counter 121 is controlled by a pilot clock 127, itself connected to a circuit 128 for adjusting the frequency band B.
  • the circuit 128 governs the frequency band B by its action on the pilot clock 127 and therefore on the counting speed of the binary counter 121.
  • the frequency modulated pulse trains present at the output of the analog switch 124 are applied, on the one hand, to the processing circuit 30 by the line 33 and, on the other hand hand, to the speaker 11 via an amplifier 125.
  • the microprocessor 32 provides via line 35 the control of the recurrence frequency T R between the different pulse trains emitted by the circuit 12 for developing frequency modulated pulse trains.
  • This allows a relatively short recurrence time, for example of the order of 1 second.
  • recurrence periods corresponding to longer time intervals between two successive pulse trains one could also, conversely, provide for control of the signal processing assembly 30 by the circuit 12 of pulse train emission.
  • a first acquisition phase comprising modules 201 and 202.
  • the module 201 corresponds to a waiting phase during which the acquisition, in synchronism with the operation of the transmitter, of information relating to a train of transmission signals transmitted on line 33 and to the echo signals received on line 34.
  • the module 202 corresponds to the reading of the digital tables of the signals transmitted and received after the phase of conversion into digital form carried out by l 'interface 31.
  • the module 203 corresponds to the phase of intercorrelation of the digital signals transmitted and received for each train of pulses transmitted by the transmitter 10. This intercorrelation can be carried out in the frequency domain, by Fourier transform, then by return to the time domain.
  • the module 204 corresponds to the initialization of the phases of intrusion detection. Variables and simulated data are taken into account which correspond, in particular, to the recording of theoretical echoes E l specific to the room to be monitored.
  • a first phase is carried out in module 205 for determining or refreshing a reference signal S R.
  • a vacuum intercorrelation signal is used, that is to say from a transmitted signal and received signals corresponding to a room, considered to be under reference conditions, the detection of the various echoes, the recognition of the echoes E R corresponding to recognized theoretical echoes and the recording in memory of this information.
  • the module 206 corresponds, on the contrary, to a control phase by viewing the reference signal and comparing it with the envelope of the intercorrelation signal produced during an active monitoring phase. This phase is useful for pre-setting and checking the operation of the system.
  • the module 207 corresponds to an active monitoring phase during which a comparison of the intercorrelation signal and the reference signal recorded in memory is carried out. The counting and tracking of the echoes that have appeared and disappeared is carried out automatically during this phase. The echoes are divided into recognized theoretical echoes E, R and unrecognized echoes E, o .
  • the modules 208 and 209 correspond to a pre-alarm phase.
  • the module 208 corresponds to a test making it possible to determine for each acquisition of a new cross-correlation signal if anomalies have been detected with respect to the reference signal. In the case where no anomaly is detected, a return is made to the initial phase of acquisition of new signals at the level of the module 201. In the case where an anomaly is detected at the level of the test 208, a prealarm in module 209, then return to an acquisition phase.
  • the modules 210 to 217 correspond to additional tests leading to alarms after a predetermined number of pre-alarms recorded at the level of the module 209.
  • the module 210 corresponds to a test to determine whether echoes recognized E IR have disappeared or not. If this test indicates that recognized echoes have not disappeared, this means that the previous prealarm corresponds to an unrecognized echo.
  • a test is then carried out on the unrecognized echoes at the level of the module 216 which counts the various recorded pre-alarms, relating to the appearance or disappearance of unrecognized echoes.
  • the module 217 triggers an alarm after a predetermined number N of pre-alarms counted by the module 216.
  • the module 210 test indicates that the pre-alarm recorded is due to the disappearance of a recognized echo, it is proceeded, at the level of the module 211, to the identification of the recognized echoes which have disappeared and an activation is carried out. memory of the result at the level of module 211.
  • the tests carried out at the level of module 211 make it possible to carry out topological monitoring of the intruder and thus to operate a logical confirmation of the diagnosis.
  • the disappearance of the same recognized echo or of a echo recognized topologically close it can be triggered at the level of the module 213 an alarm from this sequence which constitutes a confirmation of the diagnosis of presence of an intruder and continuity of its trajectory in the room.
  • a pre-alarm message is recorded at the level of the module 212 and an alarm can then be triggered upon detection of at least a third pre-alarm at the level of the module 209.
  • the logical structure of development of the alarm signal is thus programmable in the microprocessor according to a logic mode adapted to the topology of the room and to the general monitoring strategy that is applied to it.
  • the modules 214 and 215 correspond to specific tests on the number of different echoes that have disappeared. Thus, at the level of the module 214, the detection of a disappearance of at least more than half of the echoes is interpreted as a malfunction of the monitoring system and an alarm is automatically triggered immediately. At the level of module 215, a test is carried out to determine whether the disappeared echoes are systematically offset on the time scale by a value greater than a predetermined value.
  • the decision process for triggering an alarm is as follows: for each pulse train emitted by the sound source 10, a feedback signal is received which reflects the configuration of the room to be monitored. Due to the intercorrelation carried out on the transmitted signal and the received signals, there is a very strong elimination of the spurious signals and therefore a self-recognition of the received signals which always constitute echoes of the transmitted signal. A simple comparison of the different intercorrelation signals produced successively from the different pulse trains emitted and the different echo signals received, makes it possible to detect a modification of the echoes and therefore to induce a presumption of intrusion. However, to minimize the risk of a false alarm, a strategy for confirming this presumption is implemented in the system as follows.
  • a simulation is used to determine the sound paths of the least attenuated echoes due to primary and secondary reflections. on the different walls and fixed obstacles of the room.
  • Such a simulation of the echo sound paths then makes it possible to establish, taking into account the length of the sound paths, a series of theoretical echoes distributed over the time scale and which can be identified each by the reflective plane or planes to which they are due.
  • Recognition of plans and sound beams defining the conditions of spatial and temporal reception of the echoes (fig. 2 to 4 and fig. 8a, 8b) makes it possible to define a comparison matrix gathering the information relating to the determined theoretical echoes.
  • the alarm may be triggered as soon as the second finding of the same fault or of a fault due to an echo recognized topologically close to the echo which caused the detection of a first fault.
  • identifiable echoes because corresponding to theoretical echoes, makes it possible to trace the route followed by an intruder within the premises and therefore to confirm the diagnosis of intrusion, which greatly increases the safety of the system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
EP19850420226 1984-12-12 1985-12-10 Procédé et dispositif de protection de locaux contre l'intrusion Expired - Lifetime EP0188165B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419235 1984-12-12
FR8419235A FR2574576B1 (fr) 1984-12-12 1984-12-12 Procede et dispositif de protection de locaux contre l'intrusion

Publications (3)

Publication Number Publication Date
EP0188165A2 EP0188165A2 (fr) 1986-07-23
EP0188165A3 EP0188165A3 (en) 1986-08-13
EP0188165B1 true EP0188165B1 (fr) 1990-10-10

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EP19850420226 Expired - Lifetime EP0188165B1 (fr) 1984-12-12 1985-12-10 Procédé et dispositif de protection de locaux contre l'intrusion

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EP (1) EP0188165B1 (es)
CH (1) CH667931A5 (es)
DE (1) DE3580099D1 (es)
ES (1) ES8702684A1 (es)
FR (1) FR2574576B1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL121068A (en) * 1997-06-12 2000-11-21 Visonic Ltd Method and apparatus for detecting the presence of a moving object in a detection area
EP1073026A1 (en) * 1999-07-29 2001-01-31 M.I.B. Elettronica S.R.L. A device and process for detecting introduction of foreign bodies into environments of varying conformation
EP1375269A1 (de) * 2002-06-25 2004-01-02 Siemens Aktiengesellschaft Akustisches Überwachungsverfahren
US7535351B2 (en) 2006-07-24 2009-05-19 Welles Reymond Acoustic intrusion detection system

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Publication number Priority date Publication date Assignee Title
US3406385A (en) * 1965-08-16 1968-10-15 Hughes Aircraft Co Intruder detection system
DE2938969C2 (de) * 1979-09-26 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Ultraschall-Raumüberwachungssystem nach dem Impuls-Echo-Verfahren
WO1982000727A1 (en) * 1980-08-20 1982-03-04 Sirai S Supersonic warning system
US4382291A (en) * 1980-10-17 1983-05-03 Secom Co., Ltd. Surveillance system in which a reflected signal pattern is compared to a reference pattern

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DE3580099D1 (de) 1990-11-15
FR2574576A1 (fr) 1986-06-13
CH667931A5 (fr) 1988-11-15
EP0188165A2 (fr) 1986-07-23
FR2574576B1 (fr) 1987-02-27
ES8702684A1 (es) 1987-01-01
ES549888A0 (es) 1987-01-01
EP0188165A3 (en) 1986-08-13

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