EP2553946B1 - Method and device for loudspeaker control - Google Patents

Description

The present invention relates to a method and a speaker control device. It applies, in particular, to the operating state of operation of outdoor siren loudspeakers and the transmission of warning signals on a site.

Sirens and loudspeakers of security systems are critical elements for rallying and / or evacuating people during an incident, a fire, a natural or industrial disaster. It is therefore necessary to check their operating condition regularly.

It is known (document WO 2008/036992 ) to send a direct current on the electrical connection supplying a loudspeaker and to measure the resistance on this link. Depending on the measured resistance, it is determined whether the speaker coil is powered by the link and in operating condition.

However, this technique has many disadvantages. On the one hand, the continuous consumption of electrical energy is not negligible. On the other hand, by permanently maintaining the diaphragm of the loudspeaker in position offset from its off-balance equilibrium position, this membrane is damaged, mechanical problems are created on the coil and the effects of corrosion. In particular, the inventors have discovered that it is this continuous supply of the coil of certain speakers located outside that causes their fouling with dust, sand or salt.

• l'accumulation de matière et
• la création d'une croute sur la membrane du haut-parleur.

This fouling causes:

• the accumulation of matter and
• creating a crust on the speaker's membrane.

It results in particular from these disadvantages that the speaker gets older and emits a gradually decreasing sound power for the same electrical control signal. These speakers thus lose their effectiveness in an accelerated manner.

The present invention aims to remedy these disadvantages.

For this purpose, according to a first aspect, the present invention is directed to a loudspeaker control method, which comprises the steps of claim 1.

With these provisions, it avoids the problems related to the use of a direct current, recalled above. In particular, it causes the emission of an audible sound during movement of the membrane, which allows the verification of proper operation by a person or a system responsible for control moving near the speaker. In addition, the mechanical impulse resulting from the electrical impulse on the speaker coil de-encodes the membrane. It is observed that the corrective action may include the triggering of an alert signal, a maintenance operation, a more powerful electrical pulse and / or the increase of the amplification coefficient of an associated amplifier. to the said speaker.

According to particular characteristics, during the step of transmitting the pulse, a pulse is transmitted comprising at least one audible frequency.

This facilitates control by a controller in the vicinity of the speaker, especially when a large number of speakers are installed on a site, for example along a tunnel.

According to particular characteristics, during the step of transmitting the pulse, a voltage of about 100 volts is used.

Thanks to these arrangements, it is possible to position the loudspeaker at a greater distance from the emitter of the electric pulse, than if a lower voltage were used.

According to particular features, during the step of transmitting the pulse, a pulse is emitted for a duration of between 50 milliseconds and 500 milliseconds.

These pulse durations are adapted on the one hand, to a good hearing by a controller moving on the site and, on the other hand, to a precise measurement of the resistance when the loudspeaker has taken a stable position.

According to particular characteristics, during the step of transmitting the pulse, a pulse is emitted at a time interval of duration less than 100 seconds.

The detection of a failure is thus fast.

According to particular features, said corrective action includes triggering an alert signal, a maintenance operation and / or a more powerful electrical pulse.

• une étape d'association d'une pluralité de systèmes d'amplification à différents sous-ensembles de la pluralité de haut-parleurs,
• une étape d'affectation de signaux différents à émettre par différents haut-parleurs pour chacun d'une pluralité de signaux de commande,
• une étape de mémorisation de paramètres représentatifs des dits signaux à émettre, dans chaque système d'amplification

à réception d'un signal de commande commun aux différents systèmes d'amplification, les systèmes d'amplification faisant émettre les signaux différents aux dits haut-parleurs, ladite action correctrice comportant une mémorisation de paramètre représentatifs de l'état dudit haut-parleur.According to particular features, the method which is the subject of the present invention further comprises:

• a step of associating a plurality of amplification systems with different subsets of the plurality of loudspeakers,
• a step of assigning different signals to be transmitted by different loudspeakers for each of a plurality of control signals,
• a step of storing parameters representative of said signals to be transmitted, in each amplification system

upon receipt of a control signal common to the different amplification systems, the amplification systems causing different signals to be transmitted to said loudspeakers, said corrective action including a parameter storage representative of the state of said loudspeaker.

According to particular features, at least one said amplification system comprises a memory of values of operating parameters, the amplification system being adapted to implement values of stored operating parameters upon reception of a predetermined signal.

According to particular characteristics, at least one said amplification system comprises an amplification level memory, the amplification system being adapted to implement a memorized amplification level upon reception of a predetermined signal.

According to particular characteristics, at least one said amplification system comprises a sound memory to be transmitted, the amplification system being adapted to implement stored sounds upon reception of a predetermined signal.

Thanks to each of these arrangements, each amplification system can be configured before making it emit a sound, the triggering signal then being identical for all the amplification systems.

According to particular characteristics, at least one said amplification system is connected to a central station by a computer link.

The link between the central station and each amplification system thus becomes digital, with the advantages that are attached in terms of resistance to spurious signals, error correction capability, energy loss, etc.

According to particular features, at least one said amplification system comprises means for controlling the operation of at least one said speaker.

According to particular features, the device which is the subject of the present invention comprises at least one sensor of a physical quantity, the control signal depending on the signal emitted by said sensor.

For example, a sensor determines the direction and strength of the wind and the control corresponds, for some loudspeakers, to a call signal to a containment and, for other speakers to a call signal to a evacuation, the speakers concerned depending on the strength and direction of the wind.

According to particular features, the method according to the invention comprises a step of capturing, by a sensor, the ambient noise before emitting an audible signal. by said loudspeaker, on receipt of a control signal common to the different amplification systems, the amplification systems making the different signals transmit to said loudspeakers with variable levels as a function of the signal emitted by said sensor for represent the ambient noise.

According to particular features, the method according to the invention comprises a step of capturing, by a sensor, the sound signal emitted by the loudspeaker on receiving a control signal common to the various amplification systems, the control systems. amplification sending different signals to said speakers with varying levels depending on the signal emitted by said sensor to represent the emitted sound signal.

Thanks to each of these arrangements, it is possible to adapt the level of the sound signals emitted by the loudspeaker to the ambient noise and to the response of the loudspeaker.

Thanks to each of these arrangements, the level of the sound signals emitted by the loudspeaker can be adapted to the ambient noise and the impulse response of the loudspeaker. In addition, an aging or other problem of the speaker can be automatically detected depending on the impulse response of the speaker.

According to a second aspect, the present invention is directed to a loudspeaker control device according to claim 9.

• un moyen d'association d'une pluralité de systèmes d'amplification à différents sous-ensembles de la pluralité de haut-parleurs,
• un moyen d'affectation de signaux différents à émettre par différents haut-parleurs pour chacun d'une pluralité de signaux de commande,
• un moyen de mémorisation de paramètres représentatifs des dits signaux à émettre, dans chaque système d'amplification à réception d'un signal de commande commun aux différents systèmes d'amplification, les systèmes d'amplification faisant émettre les signaux différents aux dits haut-parleurs, le moyen de déclenchement étant adapté à ce que ladite action correctrice comporte une mémorisation de paramètre représentatifs de l'état dudit haut-parleur.

According to particular features, the device which is the subject of the present invention further comprises:

• means for associating a plurality of amplification systems with different subsets of the plurality of loudspeakers,
• means for assigning different signals to be transmitted by different loudspeakers for each of a plurality of control signals,
• means for storing parameters representative of said signals to be transmitted, in each amplification system on receiving a control signal common to the different amplification systems, the amplification systems making the different signals emit to said loudspeakers, the triggering means being adapted so that said corrective action comprises a storage of representative parameters of the state of said speaker.

The advantages, aims and special features of the device object of the second aspect of the present invention being similar to those of the method object of the first aspect of the present invention, as succinctly described above, they are not recalled here.

It is, moreover, known to have sirens on a site and to implement a central station with an amplification chain to transmit to all speakers sirens, the same signal with the same intensity so that all sirens emit this signal.

However, this technique has many disadvantages. On the one hand, it does not make it possible to emit different audible signals intended for different zones of the site and they do not make it possible to define a zone of emission which depends on the circumstances. The inventors have determined that, according to the prevailing wind, for example, during a chemical disaster with emission of gas into the atmosphere, different signals must be transmitted in the leeward zone, for example to encourage the confinement of people. likely to be exposed, and in other areas, for example to cause evacuation.

The present invention also aims to remedy these drawbacks.

• une pluralité de haut-parleurs et
• une pluralité de systèmes d'amplification reliés à différents sous-ensembles de la pluralité de haut-parleurs.

For this purpose, an example shows a loudspeaker control device, which comprises:

• a plurality of speakers and
• a plurality of amplification systems connected to different subsets of the plurality of loudspeakers.

Thanks to these arrangements, different signals can be emitted with different powers in different areas of the site and / or its vicinity.

According to particular features, at least one said amplification system comprises a memory of values of operating parameters, the amplification system being adapted to implement values of stored operating parameters upon reception of a predetermined signal.

According to particular characteristics, at least one said amplification system comprises an amplification level memory, the amplification system being adapted to implement a memorized amplification level upon reception of a predetermined signal.

According to particular characteristics, at least one said amplification system comprises a sound memory to be transmitted, the amplification system being adapted to implement stored sounds upon reception of a predetermined signal.

Thanks to each of these arrangements, each amplification system can be configured before making it emit a sound, the triggering signal then being identical for all the amplification systems.

According to particular characteristics, at least one said amplification system is connected to a central station by a computer link.

The link between the central station and each amplification system thus becomes digital, with the advantages that are attached in terms of resistance to spurious signals, error correction capability, energy loss, etc.

According to particular features, at least one said amplification system comprises means for controlling the operation of at least one said speaker.

According to particular features, the device which is the subject of the present invention comprises at least one sensor of a physical quantity, the control signal depending on the signal emitted by said sensor.

For example, a sensor determines the direction and strength of the wind and the control corresponds, for some loudspeakers, to a call signal to a containment and, for other speakers to a call signal to a evacuation, the speakers concerned depending on the strength and direction of the wind.

• une étape d'association d'une pluralité de systèmes d'amplification à différents sous-ensembles de la pluralité de haut-parleurs,
• une étape d'affectation de signaux différents à émettre par différents haut-parleurs pour chacun d'une pluralité de signaux de commande,
• une étape de mémorisation de paramètres représentatifs des dits signaux à émettre, dans chaque système d'amplification

à réception d'un signal de commande commun aux différents systèmes d'amplification, les systèmes d'amplification faisant émettre les signaux différents aux dits haut-parleurs.Another example shows a method of controlling a plurality of loudspeakers, which comprises:

• a step of associating a plurality of amplification systems with different subsets of the plurality of loudspeakers,
• a step of assigning different signals to be transmitted by different loudspeakers for each of a plurality of control signals,
• a step of storing parameters representative of said signals to be transmitted, in each amplification system

upon reception of a control signal common to the different amplification systems, the amplification systems making the different signals emit to said loudspeakers.

Since the advantages, aims and particular features of the process that are the subject of the fourth aspect of the present invention being similar to those of the device that is the subject of the third aspect of the present invention, as succinctly set forth above, they are not recalled here.

The various features of the various aspects of the present invention are advantageously combined to form a speaker control method and device. In particular, the corrective action characteristic of the first two aspects of the invention may include increasing the amplification coefficient of an amplifier associated with said speaker according to the third and fourth aspects of the invention.

• la figure 1 représente, schématiquement, un premier mode de réalisation particulier du dispositif objet de la présente invention incorporé à un système de sécurité,
• la figure 2 représente, schématiquement, un mode de réalisation particulier d'un dispositif d'amplification illustré en figure 1,
• la figure 3 représente, sous forme d'un logigramme, des étapes de fonctionnement du dispositif illustré en figure 1 et
• la figure 4 représente, schématiquement, un deuxième mode de réalisation particulier du dispositif objet de la présente invention.

Other advantages, aims and features of the present invention will become apparent from the description which follows, made for an explanatory and non-limiting purpose, with reference to the appended drawings, in which:

• the figure 1 represents, schematically, a first particular embodiment of the device of the present invention incorporated in a security system,
• the figure 2 represents, schematically, a particular embodiment of an amplification device illustrated in FIG. figure 1 ,
• the figure 3 represents, in the form of a logic diagram, steps of operation of the device illustrated in FIG. figure 1 and
• the figure 4 represents, schematically, a second particular embodiment of the device object of the present invention.

We observe figure 1 , a device according to the present invention 105 comprising a microprocessor alarm centralizer 125 whose inputs are connected to sensors of physical quantities, for example smoke detectors 115, alarm detectors 120. Microprocessor inputs 125 are also connected to a network 130. In particular embodiments, at least one physical magnitude sensor is adapted to detect a type of danger, the position of this danger being determined as a function of the position of this sensor and / or at least one physical magnitude sensor is adapted to determine the direction and / or the force of the wind.

The outputs 135 of the microprocessor 125 are connected to links 155 leading to loudspeakers 140 via amplifiers 145 and to a network 150. The terms "input" and "output" must here be considered as indicating the main direction of transmission of information related to incidents. It does not preclude that, for configuration, control or maintenance functions, for example, information may flow in the opposite direction.

The alarm centralizer 110 is of known type, apart from the specific functions related to the implementation of the present invention. It receives signals from the smoke detectors 115, alarm detectors 120 and the network 130. In a known manner, in the event of detecting abnormal conditions by the detectors or receiving triggering signals from the network 130, the centralizer 110 triggers remote warning signals on the network 150 and transmits audible signals to the amplification devices 145 of the speakers 140. These signals represent a type of danger as defined by the regulations.

It is noted that the networks 130 and 150 can be confused. These networks are computer networks and / or telecommunication networks.

Preferably, the links 155 between the centralizer 110 and the amplification devices 145 are digital links, for example of the Ethernet (registered trademark) type.

The microprocessor 125 is adapted to cause the centralizer 110 to transmit a pulse on the electrical link with each amplifying device 145 of the loudspeaker 140. During this pulse, the microprocessor 125 is adapted to measure the electrical resistance on each link. 155, for example by measuring the intensity of the electric current flowing through this connection 155 and dividing the voltage delivered during the pulse by this electrical intensity. The microprocessor 125 is adapted to determine the state of each loudspeaker 140 as a function of the measured resistance. For example, the microprocessor 125 compares the measured resistance to two upper and lower limit values and determines that the speaker 140 is operative if the measured resistance is between these two limit values. If it is not the case, the microprocessor 125 triggers an alert on the network 150. The operation of the microprocessor 125 is detailed with respect to the figure 3 .

It is noted that, according to the variants, the pulses are emitted simultaneously on the outputs 135 or sequentially on one and the other of the outputs 135.

Preferably, the microprocessor 125 causes the centralizer 110 to transmit a pulse comprising at least one audible frequency. Thus, auditory control can be easily performed by browsing the site on which the speakers 140 are located.

In embodiments, the pulse is carried by a voltage of about 100 volts, at +/- 30%. These embodiments are particularly suitable for long links. In embodiments, each pulse has a duration of between 50 milliseconds and 500 milliseconds.

In embodiments, the microprocessor 125 sends, for each speaker 140, a pulse with a time interval of time between 20 to 200 minutes. Thus, the discomfort caused by the impulses is more rare.

In embodiments, the microprocessor 125 causes the centralizer 110 to transmit, for each loudspeaker 140, a pulse with a time interval of less than 100 seconds duration. Thus the detection of a failure is faster.

We observe figure 2 , an amplification device 145 receiving messages from a centralizer 110, via a link 155 and transmitting amplified signals to the loudspeaker 140. This amplification device comprises a microprocessor 160 , a non-volatile memory 165 and an amplifier 170. The microprocessor 160 receives messages from the centralizer 110, writes and reads the 165 memory and controls the signals amplified by the amplifier 170 and broadcast by the speaker 140, according to the information read in the memory 165.

The microprocessor 160 receives and stores, in particular, values of operating parameters, amplification levels, and sounds to be transmitted. On receipt of a predetermined warning message, the microprocessor reads, in memory 165, the parameter values, the amplification level and the sounds to be implemented and causes the emission of an amplified sound signal representing the sounds. read and the sound level read.

For example, an alert message represents an instruction of evacuation of the whole site, an instruction of evacuation of a part of the site and of containment in another part of the site, an instruction of evacuation of a part of the site. site and assembly of people in another part of the site, it being understood that the parts of the site considered can depend on the type of danger and its displacement, for example the prevailing wind ... Each of its messages corresponds, for each device of amplification, sounds to be emitted and a sound level to be used.

Thus, it is possible to configure each amplification system before making it emit a sound, the triggering signal then being identical for all the amplification systems.

• une pluralité de haut-parleurs 140 et
• une pluralité de systèmes d'amplification 145 reliés à différents sous-ensembles de la pluralité de haut-parleurs.

The loudspeaker control device 105 thus comprises:

• a plurality of loudspeakers 140 and
• a plurality of amplification systems 145 connected to different subsets of the plurality of loudspeakers.

In the embodiment described and shown in figures 1 and 2 each amplification system is connected to a single loudspeaker. However, in other embodiments, at least one amplification system is connected to a plurality of loudspeakers. By implementing the present invention, it is possible to transmit different signals with different powers in different zones of the site and / or its vicinity.

We observe figure 3 that, during a step 200, the device 105 is put into operation. During a step 205, for each alert message and each loudspeaker 140 is transmitted from the centralizer 110 to the device amplifier 140 associated with said loudspeaker 140, the parameter values, amplification levels and sounds to be transmitted. This data is stored in the memories 165 of the amplification devices 145.

Then, during a step 210, the microprocessor 125 performs a delay, that is to say, a predetermined time is counted. As indicated above, this predetermined time is, in embodiments between 20 and 200 minutes and, in other embodiments, less than 100 seconds.

During a step 215, at the end of the predetermined duration, the microprocessor 125 sends a pulse by the centralizer 110, for each loudspeaker 145.

During a step 220, the microprocessor 125 measures the resistance on the link with each loudspeaker 145. During a step 225, the microprocessor determines, as a function of the resistance measured, whether a fault is detected on the one of the links.

During a step 230, the microprocessor causes the display and the remote transmission of a message representing the result of step 225. During a step 235, if the evolution of the measured resistance is predetermined type, for example it evolves to a limit value or it alternates between two distant values, the microprocessor 125 causes the triggering of a corrective action. For example, the microprocessor 125 causes the display and transmission of an alert message requiring maintenance operations. In embodiments, the microprocessor causes, for the speaker considered, a more powerful electrical pulse or a parameter storage representative of the state of said speaker, for example an increase in the gain factor of the associated amplifier auditing speaker or an increase in the stored power of the signal to be transmitted to said speaker.

During a step 240, which is represented after step 235 but is in fact continuously performed in parallel with steps 210 to 235, it is determined whether an alert must be triggered or based on signals received from sensors. or based on signals received on the network 130. If no, then we return to step 210.

If an alert is to be triggered, during a step 245, a capture of a physical quantity is performed. For example, the direction and / or wind force and / or the type and / or position of a hazard are measured. According to at least one of these physical quantities, a control signal, also called "warning message", is determined for each of the amplification devices.

For example, leeward speaker amplification devices for a chemical incident memorize a person containment call signal while loudspeaker amplification devices upstream of the incident location , with respect to the wind, memorize an evacuation signal. On the other hand, for a fire, the messages or signals can be reversed.

It is observed that the amplification devices may have in memory, upstream, a set of parameters of sound signals to be transmitted, the control signal directly representing the position and type of the hazard and the direction of the wind.

During a step 250, the alert message is transmitted from the centralizer 110 to all the amplification devices corresponding to the danger and its evolution. In embodiments, the alert message represents the value of the physical quantity sensed during step 245, as set out below with respect to this step 245.

During a step 255, each amplification device processor 145 reads the values of parameters, amplification level and sounds to be transmitted, in memory 165. During a step 260, each processor has amplify and broadcast the sound signals corresponding to these values, level and sounds.

In the second embodiment 190 of the device which is the subject of the invention, illustrated in FIG. figure 4 , we find the same elements as in the first embodiment illustrated in figures 1 and 2 with the exception of at least one (here a) amplification device 145 which is replaced by an amplification device 175. The amplification device 175 comprises, in addition to the microprocessor 160, non-volatile memory 165 and the amplifier 170, a sound environment sensor 185 and a sensor 190 of a physical magnitude representative of a hazard. The sensor 185 is, for example, a microphone of known type. The sensor 190 is, for example, a detector for fire, smoke, heat, radiation, including radioactive, gas or intrusion.

The amplification device 175 receives messages from a centralizer 110, via a link 155, and transmits amplified signals to the loudspeaker 140. More precisely, it is the microprocessor 160 which receives messages from the centralizer 110, writes and reads the memory 165 and controls the signals amplified by the amplifier 170 and broadcast by the loudspeaker 140, according to the information read in the memory 165.

As discussed with respect to the first embodiment, the microprocessor 160 receives and stores, in particular, values of operating parameters, amplification levels, and sounds to be transmitted. On receipt of a predetermined warning message, the microprocessor reads, in memory 165, the parameter values, the amplification level and the sounds to be implemented and causes the emission of an amplified sound signal representing the sounds. read and the sound level read.

For example, an alert message represents an instruction of evacuation of the whole site, an instruction of evacuation of a part of the site and of containment in another part of the site, an instruction of evacuation of a part of the site. site and assembly of people in another part of the site, it being understood that the parts of the site considered can depend on the type of danger and its displacement, for example the prevailing wind ... Each of its messages corresponds, for each device of amplification, sounds to be emitted and a sound level to be used.

Thus, it is possible to configure each amplification system before making it emit a sound, the triggering signal then being identical for all the amplification systems.

• une détection de danger, par l'intermédiaire du capteur 180,
• une mesure de bruit ambiant initial avant le déclenchement de l'émission sonore par le haut-parleur 140,
• une mesure de niveau sonore d'émission, après le déclenchement de l'émission sonore par le haut-parleur 140 et/ou
• une mesure de niveau sonore avant et pendant une impulsion sonore telle qu'exposée en regard des figures 1 à 3.

In addition to these functions already presented in connection with the first embodiment, the microprocessor 160 realizes, and communicates to the centralizer 110,

• a danger detection, via the sensor 180,
• an initial ambient noise measurement before the sound emission is triggered by the loudspeaker 140,
• an emission sound level measurement, after the triggering of the sound emission by the loudspeaker 140 and / or
• a sound level measurement before and during a sound pulse as outlined in relation to Figures 1 to 3 .

When triggering a sound emission, the amplifier 170 is controlled, first, according to the initial ambient noise level. For example, the amplifier 170 is controlled to cause the loudspeaker 140 to transmit a signal 10 dB greater than the ambient noise.

In variants, during the sound emission, the amplifier 170 is controlled according to the emission level. Again, the amplifier 170 is controlled to cause the loudspeaker 140 to transmit a signal of, for example, 10 dB greater than the ambient noise.

Examples of application of this operation are given below.

In a tunnel, the ambient sound levels can be very different depending on the traffic and the possible operation of fans. The emergence of the warning signal, 10 dB higher than the ambient noise, can vary the siren level from 100 dB to 120 dB.

As part of an internal organization plan, a company is asked to notify its employees without disturbing the neighborhood. The operation described above makes it possible to ensure the maximum effectiveness of the warning signal without disturbing the surrounding populations.

In the context of setting up equipment in environments with a very strong soundscape (steel mill, glassworks, etc ...) the sound diffusers must cover the ambient noise. This ambient noise may be higher or lower depending on the use of the machines. The operation indicated above makes it possible to broadcast the power necessary to be heard even if wearing anti-noise headphones, but not higher than what is necessary, which limits the noise exposure of workers.

In variants, the noise caused by the sound pulse emitted by the loudspeaker 140 is detected and measured automatically, either locally by the microprocessor 160, or at the centralizer 110.

The sound level measurement of the ambient noise also makes it possible, from a "zero" reading (commissioning or maintenance operation), to check a drift of the level during the monthly tests, to trigger any preventive maintenance operations.

Claims (15)

1. Method for checking loudspeakers, characterized in that it comprises:

   - a step (215) of emitting a pulse over an electrical connection with the loudspeaker;

   - a step (220) of measuring the electrical resistance over said connection;

   - a step (225) of determining according to said resistance the state of the loudspeaker;

   - a step of capturing by a sensor during the pulse the sound emitted by the loudspeaker; and

   - a step (230, 235) of triggering a corrective action, depending on the state of the loudspeaker determined in this way, the step of triggering the corrective action being dependent on the signal emitted by said sensor to represent this sound emitted by the loudspeaker.
2. Method according to claim 1, wherein, during the step of emitting the pulse, a pulse comprising at least one audible frequency is emitted.
3. Method according to one of claims 1 or 2, wherein, during the step of emitting the pulse, a voltage of about 100 Volts is utilized.
4. Method according to one of claims 1 to 3, wherein, during the step of emitting the pulse, a pulse of between 50 milliseconds and 500 milliseconds in duration is emitted.
5. Method according to one of claims 1 to 4, wherein, during the step of emitting the pulse, a pulse is emitted at a time interval of less than 100 seconds in duration.
6. Method according to one of claims 1 to 5, wherein said corrective action comprises triggering an alert signal.
7. Method according to one of claims 1 to 6, wherein said corrective action comprises triggering a maintenance operation.
8. Method according to one of claims 1 to 7, wherein said corrective action comprises triggering a more powerful electrical pulse than the electrical pulse emitted during the step (215) of emitting the pulse.
9. Device for checking loudspeakers, characterized in that it comprises:

   - a means of emitting a pulse over an electrical connection with the loudspeaker;

   - a means of measuring the electrical resistance over said connection;

   - a means of determining the state of the loudspeaker according to said resistance;

   - a sensor for capturing the sound emitted by the loudspeaker during the pulse; and

   - a triggering means designed to trigger a corrective action, depending on the state of the loudspeaker determined in this way, the triggering of the corrective action being dependent on the signal emitted by said sensor to represent this sound emitted by the loudspeaker.
10. Device according to claim 9, wherein the means of emitting the pulse is designed to emit a pulse comprising at least one audible frequency.
11. Device according to one of claims 9 or 10, wherein the means of emitting the pulse is designed to utilize a voltage of about 100 Volts.
12. Device according to one of claims 9 to 11, wherein the means of emitting the pulse is designed to emit a pulse of between 50 milliseconds and 500 milliseconds in duration.
13. Device according to one of claims 9 to 12, wherein the means of emitting the pulse is designed to emit a pulse at a time interval of less than 100 seconds in duration.
14. Device according to one of claims 9 to 13, wherein said corrective action comprises triggering an alert signal.
15. Device according to one of claims 9 to 14, wherein said corrective action comprises triggering a more powerful electrical pulse than the previous pulse.

Images