WO2011108943A1

WO2011108943A1 - A portable intrusion, water damage or fire security warning system

Info

Publication number: WO2011108943A1
Application number: PCT/NO2011/000077
Authority: WO
Inventors: Tor SØNSTERØD; Bjørn KRAABØL
Original assignee: Idteq As
Priority date: 2010-03-04
Filing date: 2011-03-04
Publication date: 2011-09-09
Also published as: NO20100310A1; NO331330B1

Abstract

The present invention relates to a hand portable complete alarm solution for securing homes and other installations against burglary and vandalism, comprising: a hand portable suitcase containing a complete intrusion security system and/or detectors/sensors for fire and water damage warning, wherein the complete security system at least includes: one or more intrusion detectors, in the form of a housing (1), electric circuitry (5) within the housing (1) for processing signals, means (5) for configuring the alarm device to compensate for changes in the surroundings, in order to prevent false alarms, an embedded power supply (7) within the housing, fire/smoke and moisture detectors with transmitters, a received adapted for receiving signals from one or more transmitters/detectors, and a communication unit configured for relaying the signals to an external receiver.

Description

A portable intrusion, water damage or fire security warning system Field of the invention

The present invention relates to an alarm device for securing a permanent installation against unlawful entry and possibly fire, moisture damage, etc. The invention is particularly useful in connection with private homes or other premises for sale/rental, securing crime scenes, guarding military and other installations which are frequently relocated. More particularly, the present invention relates to a portable intrusion, fire, or water damage security warning system, wherein the security system includes an alarm device comprising electrical circuits inside a housing for sending a radio signal to an external alarm central and fire/smoke and moisture detectors having transmitters for transmitting alarm signals.

Background

A need exists for being able to install a warning system in a quick and efficient manner, with no unnecessary installation and time-consuming configuration. Typically, this is desirable in cases where houses, flats, or industrial buildings are to be sold or rented out. The object is then to distribute and deploy alarm devices at the premises as straightforward and simple as possible. If each alarm unit needs to be positioned accurately and configured "correctly" for the alarm to function properly, a lot of time will be spent in carrying out this task. This hence leads to costly and more effort-intensive alarm systems and therefore reduces the use of intrusion and vandalism protection

Temporary protection alarm devices are known from prior art. Common for such devices is that they require some kind of extensive installation. For example, consider the communication part, which may be similar, but when one moves towards the unit emitting the signal, the conditions change. The existing systems require an

unobstructed view, detect in a limited field of view or perhaps only on limited surfaces, such as a glass rupture detector on one window. Thus, in existing systems a large number of units are required in order to be able to achieve a satisfactory protection of a unit. It is hence apparent that a substantial period of time must be spent by the personal at the site on deploying and configuring the alarm devices at each individual installation correctly, so that they can function well in cooperation with an alarm central. This is a consequence, among other things, of the type of detection principle being employed.

From US 6380860 B1 , a complete portable alarm system arranged in a suitcase is known. Several exemplary portable security or alarm systems are found in the patent publications US 5200735 A, US 2009/295578 A1 , US 2005/0030179 A1 , and US 4742336 A.

Ideally, all a person should have to do is to enter into a house, for example, place the alarm device behind the door without having to worry about the position or orientation thereof, and then just close and lock the door to the house again. Or, for that matter, place the detector in sight on a table, hidden under a sofa, under a table, on top of a cabinet, or behind a curtain. The object of the present invention is to provide an alarm device which following such a simple deployment operation is still able to carry out its protective task 100% reliably.

Summary of the invention

Thus, an important aspect of the present invention is that the detection principle being used works omnidirectionally, i.e. the detector receives external signals from any direction. Another important aspect is to avoid blocking the path for the external signal to the detector, regardless of how the alarm device is positioned.

According to the present invention, a portable intrusion, fire, or water damage security warning system is provided, wherein the security system includes an alarm device comprising electrical circuitry inside a housing for sending a radio signal to an external alarm central as well as fire/smoke and moisture detectors having transmitters for transmitting alarm signals. The security system is further characterized by a portable suitcase containing: a) one or more intrusion detectors in the form of a housing having at least one opening in at least one of the housing walls in order to provide an air path to a microphone disposed inside the housing, the microphone being configured for picking up sound and volumetric signals in the frequency range from 0.1 Hz, b) the electrical circuitry inside the housing is further adapted for processing signals from the microphone and for transmitting the radio signal to the external alarm central when the alarm device determines that a detected event is undesired, abnormal, or for communicating normal status if the alarm device is configured to do so, c) the electrical circuitry is adapted for configuring the alarm device to

compensate for changes in the surroundings, in order to prevent the occurrence of false alarms, d) an integrated power supply in the housing,

the housing being provided with steering features for ensuring a free air path to the at least one opening regardless of the orientation assumed by the alarm device when placed on a support, e) a receiver configured for receiving signals from one or more

transmitters/detectors, and f) a communication unit configured for relaying the signals to an external receiver, as an encrypted or open transmission.

According to an alternative embodiment, the steering features may be constituted by a netting or grating secured to the housing and spaced at some distance from the housing around the opening. In this case, the netting/grating may further surround the entire housing as a sphere or egg, and the netting/grating may be secured to the housing at corner points of the housing or be attached to the housing by way of short struts. Preferably, said struts are resilient in order to provide a shock dampening function. Moreover, it is also advantageous that said netting/grating is a two-piece netting/grating with a hinge and locking arrangement for providing easy access to the housing. The netting/grating is preferably made of a strong plastic material.

According to a further embodiment, the steering features may be comprised of a number of openings in the form of perforations in the housing wall(s), formed in the wall(s) at locations ensuring that at least one or more perforations will face

upwardly/outwardly regardless of the final orientation of the alarm device. The perforations may advantageously be substantially uniformly distributed around the entire outer surface of the housing.

In some embodiments, it will be advantageous to provide a soft outer coating around the housing, preferably of a soft rubber material, for protecting against mechanical impact.

It is also advantageous if the at least one opening in the housing wall is covered by a diaphragm that prevents the penetration of dust while allowing audio signals to pass.

The suitcase further contains:

- a receiver for receiving and relaying signals from several detectors in such a manner that the system has a nearly unlimited capacity over an area for which safeguarding is desired.

- a GSM/GPRS/CDMA/TDM (SMS/IP) unit, but not limited thereto, which is able to relay signals from the receiver to privately owned or commercial receivers.

Additional features and advantages of the present invention will be apparent from the attached patent claims. Brief description of the drawings

In the following, the invention will be illustrated in more detail by way of some advantageous embodiments, and in this connection reference will be made to the attached drawings, in which:

Fig. 1 shows a first embodiment of an alarm device according to the present invention in a side view,

Fig. 2 shows the same alarm device as Fig. 1 , but in a bottom view,

Fig. 3 shows a second embodiment of the alarm device according to the invention,

Fig. 4 shows the same as Fig. 3, but from another angle,

Fig. 5 shows a third embodiment of the alarm device according to the invention,

Fig. 6 shows a schematic of a fourth embodiment of the alarm device according to the invention,

Fig. 7 shows a variant of the embodiment shown in Fig. 6,

Fig. 8 shows an additional feature of the embodiments shown in Figs. 6 and 7,

Figs. 9 and 10 show deployment of the alarm device according to the invention in a vehicle, and

Fig. 1 1 is a view showing the transmission of a radio signal from the alarm device according to the invention to an external alarm central.

Detailed description of the invention

As mentioned in the background section, the object of the present invention is to provide an alarm device which may very easily be placed practically anywhere inside a stationary unit such as, but not limited to a house, flat, office building, or industrial building. This is of particular interest in the real estate market where private homes are to be sold or rented out for shorter or longer periods. It is assumed that an employee, such as an estate agent, can carry with him/her such an alarm solution containing an appropriate number of such alarm devices, unlock the flat, and relatively quickly and rather recklessly place the alarm device(s) inside the flat/building, on a sofa, under a table, on top of a cabinet, behind a curtain, or visible on a table, and then leave the building and lock the door to thereafter remotely activate the signal transmission by way of telephone, for example. Alternatively, the system is activated before the person leaves the premises. Such an operation can then be accomplished in a few minutes. For example, one may secure a private home in 10 minutes and remove the system even faster. Most of the time is then actually spent on travelling to the premises to carry out the installation.

In order for such a relatively reckless manner of deployment to still be able to result in a good detection function, firstly, a detection principle has been chosen that is based on detecting sound regardless of frequency range. The invention uses pressure waves which propagate in the air and which are typically generated by objects moving the mass (air) or through movement of large mass objects, e.g. objects such as windows and doors, and or in cases where the application of force are detected on other parts of the structure, such as walls, floor, and ceiling. The invention also uses signals caused by sound in cases where the activity causing the signal has been recognized. Hence, a detector for such sound will preferably be omnidirectional, i.e. pick up signals from any direction.

The present invention is not directed to the processing of signals picked up by sensors/detectors as such. The Norwegian patent NO 322340, having iDTEQ as the applicant, which is incorporated herein by reference in its entirety, however, shows examples of how signals picked up by detectors/sensors may be processed. According to said publication, the signal processing circuitry includes at least a processor and program algorithms for determining the most likely cause of detected signals, to thereby reduce the occurrence of false alarms and detection failure. The processor can receive signals and use program algorithms to determining information from picked-up signals and then make decisions based on such information. The processor may also modify decision parameters and criteria accordingly. As such, a particular cause of detected signals can be determined among various possible causes, and the errors made in this determination reduce as the amount of relevant information increases. The decision parameters may be adaptive in order to maintain a predetermined temporal frequency of alarms for varying detection conditions. The processor and program algorithms used are implemented as an expert system utilizing artificial intelligence technology. In practice, this could mean that the processor adaptively optimizes threshold levels for probability for the occurrence of predetermined signal states from at least one burglary detector to a predetermined temporal frequency of false alarms.

The present invention can also be applicable in a scenario where signals captured by detectors/sensors are processed in an even more sophisticated manner; typical examples of such signal processing is found in the Norwegian patent application 2008 0920 with iDTEQ AS as the applicant, which is incorporated by reference herein in its entirety. According to 2008 0920, an intrusion detection system is provided which may include at least an intrusion detector and a processor connected thereto, which intrusion detector comprises a transducer for picking up gas-borne mechanical vibration energy within a certain frequency range and convert this energy to electric vibration energy within the same frequency range, and an analog/digital converter is included in the system in order to be able to provide digital signals representing the electric vibration energy. The detector according to 2008 0920 may be characterized in that the detector further includes a low frequency signal for extracting and delivering to a first input of the processor a low frequency signal part of said frequency range as well as a high frequency channel for extracting and delivering to a second input of the processor the remaining part of the signal of said frequency range, and in that the processor includes circuitry for using certain digital characteristics of the low frequency signal part and the remaining part of the signal, respectively, in order to provide decisions regarding which events have caused the gas borne mechanical vibration energy.

Said processor may be provided with means for digitally signal processing the signals provided at the inputs thereof, and the processor further includes a signal recognition part in which the digitally processed signals are compared to trained and stored signal patterns. Both the detector and the processor may be configured to further subdivide the low frequency and high frequency channels into several channels based on high gain filtering, low gain filtering, and frequency content.

The A/D-converter may be embedded in the detector.

The low frequency channel may be a channel which processes signals in a frequency sub range of about 1 -5 Hz, while the high frequency channel may be a channel which processes signals in a frequency sub range of about 5-20 Hz.

In exemplary embodiments according to 2008 0920, the processor circuitry may include:

- a comparator for comparing certain digital signal characteristics of the low frequency part to corresponding digital signal characteristics of the remaining signal part and for providing a set of comparison result signals to additional processor subunits for further processing, and

- among said additional processor subunits, an association subunit for

establishing an association between a comparison result signal and a word to be selected from a word table, and a status subunit for establishing a status based on the selected words.

It should be appreciated that in this context, the meaning of the term "word" may be a regular word or a token/character (e.g. a Chinese or Japanese language character) or even a number. The status subunit may further be able to organize selected words according to a ranking order, which may be either predefined or natural.

Additionally, the association subunit may be able to select automatically, and if the word selection criteria are not met, a word associated with an adjacent comparison result signal which roughly satisfies the selection criteria will be selected. In one example, the comparator will be configured for comparing sequences of incoming energy bursts in the low frequency signal part to sequences in the remaining signal part.

In another example, the comparator will be configured for comparing the duration of incoming energy bursts in the low frequency signal part to the duration in the remaining signal part.

In yet another example, the comparator may be configured for comparing time periods between energy bursts in the low frequency signal part to time periods in the remaining signal part.

In a still further example, the comparator may be configured for comparing event times for given signal events such as absolute maximum amplitudes within energy bursts in the low frequency signal part to event times in the remaining signal part.

In a further embodiment, the comparator may be configured for comparing the duration of complete series of energy bursts in the low frequency signal parts to corresponding durations in the remaining signal part.

According to still another example, the comparator may be configured for comparing the signal strength of incoming energy bursts in the low frequency part to the signal strength in the remaining signal part.

In a still further embodiment, the comparator will be configured for comparing signal amplitudes in incoming energy bursts in the low frequency signal part to signal amplitudes in the remaining signal part.

Thus, in exemplary embodiments of the present invention, signal processing circuitry operating according to the principles set out above for automatically deciding on whether or not intrusion is in progress can be used. It must be understood, however, that the present invention does not necessary have to use the signal processing methods outlined above, as the invention relates to a hand portable complete alarm solution for protecting private homes and the like against burglary and vandalism and not signal processing as such.

However, the present invention are more precisely related to an alarm solution, the physical compactness of the alarm solution, and the detection technology, in particular intended for random handling as mentioned above. The goal is that the alarm solution ^~ shall be extremely easy to use and work equally well regardless of how and where the detector, for example, is placed inside the house with respect to both position and orientation.

It is therefore important that there must exist, at all times, an air path into a microphone embedded in the alarm device of the invention. Unless certain measures are taken, an alarm device which is not designed in accordance with the present invention may easily end up in such a position that no unobstructed air path exists into the

sensor/microphone intended to pick up the signals, and, additionally, an unfavorable positioning inside a cabinet, for example, will result in a weak reception of normal audio frequencies. Said infrasound frequencies, however, may function excellently in any location. Therefore, a combination of detection technologies including frequencies in all ranges is used in order to achieve a greatly improved signal interception.

Accordingly, a few important principles form the basis for the invention, namely the compactness of the solution or system providing a complete security system which in popular terms may be referred to as a "Plug and Play" solution, placed in a single suitcase with the size of an attache case which contains all components, the use of detectors utilizing audio signals, but not so limited, making sure the placement or positioning is unimportant, and particular features of the alarm device which make sure that there will always exist an unobstructed air path into the microphone for audio reception, a receiver allowing for a practically unlimited area of coverage, a communication unit relaying signals to private or commercial receivers. The solution offers the user a unique security article making short or longer time safeguarding very easy.

Reference is now made to Fig. 1 , which schematically shows an alarm device generally referred to as 100. The alarm device 100 has an outer casing in the form of a housing 1 , which in the case shown is a parallelepiped-shaped box. There are no limitations on the geometrical shape of the box. As such, the box could also have curved walls, or a larger number of walls/sides/corners. However, an opening 2 must exist which provides an unobstructed air path into an important element, namely the microphone 4, as shown schematically in the figure. Microphone 4 is connected to signal processing circuitry 5, which will not be discussed in any detail in the present invention. The signal processing circuitry is capable of deciding whether or not an abnormal situation exists, i.e. intrusion, in a given case, and if so, a radio signal can be emitted by means of an associated antenna (RF transmitter or the like), which is also shown purely schematically on the outside of housing 1.

The element important for the invention in Fig. 1 is the protrusions or legs 9, which make sure that there will always exist an unobstructed air path into opening 2, even if opening 2 ends up facing down against a seat in a chair or down against a floor. In the absence of such legs 9, opening 2 could easily end up facing down against some support, so that no unobstructed air path would exist into microphone 4.

Fig. 2 shows the same alarm device as fig. 1 , but in a "bottom view". In the embodiment shown, it can be seen that alarm device 100 is provided with three legs 9, even though in practice, two such legs would be sufficient. Actually, with a proper length leg, one such leg 9 would be sufficient if positioned in the vicinity of the opening 2. The alarm device shown would then assume a "tilted" position but still provide a free air path into opening 2 and microphone 4. In Fig. 3 an alternative solution is shown which will also ensure the existence of an unobstructed air path into opening 2. In principle, the same kind of alarm device 100 as the one in Fig. 1 and Fig. 2 is shown, but the legs 9 has now been replaced with a grating 10, which in the example shown has a hemispherical shape and is mounted around opening 2. This represents another way of ensuring the existence of the necessary unobstructed air path into opening 2. Other elements appearing in Fig. 3, as well as in Fig. 4, which shows the same device as Fig. 3, are also as shown in Fig. 1 and Fig. 2. It is understood that such a grating, which could also have a different shape from the one shown, will make sure that there will always be an unobstructed air path into opening 2 and microphone 4.

It can be noted that should the alarm device 100 end up upside-down as compared to the position shown in Fig. 4 and Fig. 1 , i.e. with the radio antenna located on the "underside", this is not a big concern as the transmitted radio signal is only to propagate a relatively short distance to the nearby receiver unit which relays signals via the communication unit. It is not a problem to provide sufficient signal strength for the radio signal to easily reach a few hundred meters, even with a downward facing antenna and from a position in a closed room. In other words, the propagation of a radio signal does not present any problems in this respect.

Fig. 5 also shows a parallelepiped box, i.e. a housing 1 containing the other necessary components. In Fig. 5, however, another shape is shown, i.e. a third embodiment with respect to said "steering features" which, as mentioned, are supposed to ensure the existence of an unobstructed air path regardless of the deployed position and orientation of the alarm device. In this case, a great number of openings 2 are provided in the walls 3 of housing 1 , as opposed to a single opening as in the above

embodiments. We therefore use the term "perforations" and note that a number of holes are provided around walls 3 so that regardless of orientation, a number of holes will be facing outwardly or upwardly. In the embodiment shown, holes are formed around four faces 3 of the parallelepiped, but additional holes could be formed in the remaining two, largest, faces 3. Other features appearing in this drawing is the microphone 4, signal processing circuitry 5, power supply 7 (preferably in the form of electric batteries), internally positioned transmitter 5 as well as an outlined diaphragm 16 covering each opening/perforation 2. The purpose of the diaphragm 16 is to prevent dust from entering into the alarm device, while (infrasound) audio signals pass through with no attenuation. In the example shown, one such diaphragm may be provided for each opening, or a band diaphragm may be attached on the inside around the entire "circumference". Such a diaphragm 16 may advantageously be made of an elastic material such as rubber or the like, but this is not necessary. The main point is that it is dust tight and resilient, i.e. transmits movement.

In Figs. 6, 7, and 8, another embodiment is shown that will ensure the existence of an unobstructed air path into an opening 2 into a housing 1 , which could be of the same type as the one shown in Figs. 1 and 2, for example, but having no legs. In this case the entire housing 1 is contained within a grating shaped like a sphere or egg, and the housing, which could have another shape than a parallelepiped box, is attached to the grating sphere either by struts 13 or in such a manner that the corners of the housing are attached directly to the grating. The former variant is shown in Fig. 6, and the variant in which comers 12 are attached to the grating is shown in Fig. 7. Reference number 1 1 refers to the fully enclosing grating/netting of Figs. 6, 7, and 8. Fig. 8 shows a rather important feature, namely a closing and opening mechanism constituted by a hinge 14 and lock 15 for providing access to the inside of housing 1 .

Moreover, it is also possible to provide features that reduce the effect of any mechanical impact to which the alarm device may be exposed being rather rapidly placed or tossed onto a sofa, for example. Such a provision is shown in Fig. 6 in the form of a soft suspension having spring-shaped struts 13.

Another way to achieve impact protection is to provide a soft outer coating around the entire housing. Such an outer coating 17 is outlined with a dotted line in Fig. 1. This coating may include a soft rubber material, foam rubber, or the like. Of course, the soft material 17 must not cover opening 2.

Figs. 9 and 10 schematically outline the deployment of the alarm device of the invention into a house.

Above, mention has been made of "infrasound and volumetric signals." As used herein, "volumetric signals" refers to signals arising from changes in an air pressure due to the change in the volume being watched over; the signal frequencies are below 20Hz and perceived by a microphone/sensor. The signals are processed analogically and/or digitally. Other audio signals that may be used for the detection span over an unlimited frequency range, such as from 1 Hz to 6000 Hz. As regards the emission of radio signals from a housing inside a grating egg or grating ball, the grating should not be made of metal, as metal may attenuate the radio signals. A strong plastic material will be preferred as material for the grating.

The use of a diaphragm 16 (see Fig. 5) for preventing dust from entering the device when used in the industry or in buildings which are cleaned regularly, for example, can be advantageous also in the other embodiments, cf. Figs. 1 -4 and Figs. 6-8.

In the embodiment shown in figs. 7 and 8, i.e. wherein a housing is attached at the corners thereof to an outside-mounted grating, advantageously mounting brackets can be used which are attached to the grating and into which the housing is positioned.

Hence, using an alarm device according to the present invention, the following is achieved:

Firstly, the alarm device detects incoming signals from any direction, i.e.

"omnidirectional" detection. Secondly, the alarm device may be put anywhere in the house. Further, no form of installation in each house is required. Furthermore, such alarm devices may be moved from one house to another with no form of adjustment or configuration necessary. Moreover, it is also possible to use such an alarm device as a sensor being part of some bigger system. The alarm device contains its own batteries for power supply and is hence completely self-sufficient. It can be provided with dust protection and can also be provided with mechanical impact protection. The alarm device may be put anywhere in the house as mentioned above regardless of angles, unobstructed view, etc. Regardless of positioning it will cover the entire perimeter within a given volume against intrusion, and may therefore be referred to as a sophisticated but simply constructed form of boundary protection.

A further possible embodiment is based on the cardanic suspension of an inner housing inside a grating, for example, in order to make sure that a microphone opening will always face upwardly regardless of the final orientation of the alarm device as placed inside the house. However, such a floating suspension (gimble mount) within a cage will be an unnecessarily complicated solution as the cage itself will provide a sufficient "steering feature", as shown in the embodiment of figs. 6, 7, and 8.

Claims

1. A portable intrusion, fire, or water damage security warning system, the security system including an alarm device (100) comprising electrical circuitry (5) inside a housing (1) for sending a radio signal to an external alarm central (6) and fire/smoke and moisture detectors having transmitters for the transmission of alarm signals, the security system being further c h a r a c t e r i z e d by

- a portable suitcase containing:

a) one or more intrusion detectors in the form of a housing (1 ) having at least one opening (2) in at least one of the housing walls (3) for providing an air path to a microphone (4) disposed inside the housing (1 ), which microphone is configured for picking up audio and volumetric signals in the frequency range from 0.1 Hz,

b) the electrical circuitry (5) inside the housing (1) are further adapted for processing signals from the microphone (4) and for sending the radio signal to the external alarm central (6) when the alarm device (100) determines that a detected event is undesired, abnormal, or for communicating normal status if the alarm device is configured to do so,

c) the electrical circuitry (5) is adapted for configuring the alarm device (100) to compensate for changes in the surroundings, for preventing the occurrence of false alarms,

d) an integrated power supply (7) in the housing (1),

the housing (1) being provided with steering features (9,2, ) for ensuring the existence of an unobstructed air path to the at least one opening (2) regardless of the orientation assumed by the alarm device (100) when positioned on a support,

e) a receiver adapted for receiving signals from one or more

transmitters/detectors, and

f) a communication unit configured for relaying the signals to an external receiver, as an encrypted or open transmission.

2. The security system of claim 1 , characterized in that the steering features are constituted by at least one protrusion or leg (9) on the housing (1) surrounding the opening (2) to the microphone (4).

3. The security system of claim 1 ,

characterized in that the steering features are constituted by a netting or grating (10) attached to the housing (1) and positioned around one or more of the openings (2) in the housing walls (3).

4. The security system of claim 3,

characterized in that the netting/grating (11) surrounds the entire housing (1) as a ball or egg, and is attached to the housing at corner points (12) of the housing or is attached to the housing by way of short struts (13).

5. The security system of claim 4,

characterized in that said struts (13) are elastic in order to provide a shock dampening function.

6. The security system of claim 4,

characterized in that the grating (11) is a two-piece grating having a hinge (14) and locking arrangement (15) for providing easy access to the housing (1).

7. The security system of claim 4,

characterized in that the grating (11) is made of a strong plastic material.

8. The security system of claim 1 ,

characterized in that the steering features are constituted by a number of openings (2) in the form of perforations in the housing wall(s), formed in the wall(s) at locations ensuring that at least one perforation (2) will face upwards/outwards regardless of the final orientation of the alarm device (100).

9. The security system of claim 8,

characterized in that the perforations (2) are distributed around the entire outer surface of the housing (1).

10. The security system of claim 1 ,

characterized by a soft outer coating (17), preferably of a soft rubber material, for protecting against mechanical impact.

11. The security system of claim 1 ,

characterized in that the at least one opening (2) in the housing wall is covered by a diaphragm (16) that prevents the penetration of dust but allows infrasound and volumetric signals to pass.

12. The security system of any one of the previous claims,

characterized in that the communication unit configured for relaying the signals to an external receiver uses SMS.

13. The security system of any one of the previous claims,

characterized in that the housing is made of a transparent material.

14. The security system of any one of the previous claims,

characterized in that signals are acquired through natural joints in the housing.