Method and device for controlling the balance adjustment of a multi-channel audio signal distribution system embedded in a vehicle

Abstract

The present invention relates to a method and device for controlling the balance adjustment of a multichannel audio signal distribution system in a vehicle's passenger compartment. The method comprises the following steps: - obtaining (51) vehicle audio channels from the multichannel audio signal; - obtaining (52) as many amplified versions of each obtained vehicle audio channel as there are output channels contributing to the sound reproduction of the multichannel audio signal, each output channel being obtained by mixing one of the amplified versions of each of the obtained vehicle audio channels; - obtaining (53) a desired balance setting; - obtaining (54) an amplification gain value for each amplified version of each obtained vehicle audio channel, from a stored amplification gain matrix taking as input the desired balance setting. Figure for the abstract: Figure 5

Description

Title of the invention: Method and device for controlling and adjusting the balance of a multichannel audio signal distribution system embedded in a vehicle technical field

[0001] The present invention relates to the field of vehicle-mounted audio and more particularly to the adjustment of balances of a multi-channel audio signal diffusion system embedded in a vehicle. Technological background

[0002] Multichannel audio signal distribution systems are increasingly used in the field of in-car audio. While traditional audio signal distribution systems often only provide stereo sound in vehicles, newer distribution systems allow for a much more immersive and sophisticated sound experience.

[0003] To achieve this, multichannel audio signal distribution systems installed in vehicles use several strategically placed speakers inside the vehicle's passenger compartment to create an immersive sound environment. These distribution systems allow for the broadcasting of multichannel content in advanced audio formats (such as Object-Based Audio format) which add an immersive dimension to the sound, in addition to the traditional left-right and front-back dimensions. This configuration makes it possible to simulate a three-dimensional sound environment, where sounds can appear to come from any direction, including from above or below.

[0004] Multichannel audio signals not only allow for the streaming of music and movies with superior sound quality, but also provide clearer and more intuitive navigation instructions, where directions can be specifically directed to drivers or passengers. The introduction of these technologies in vehicles therefore aims to transform the driving and travel experience, making listening to music, watching movies, or even receiving phone calls more enjoyable and immersive.

[0005] However, the adoption of these technologies also poses significant challenges, particularly with regard to the adjustment of left / right and front / rear balances, also known as "fader".

[0006] Indeed, traditional balance and fader adjustment processes gradually "turn off" or "turn on" an audio channel to limit the sound reproduction of a multichannel audio signal to one or more areas of a vehicle's interior. An audio channel is said to be "off" when it is completely attenuated and "on" when its content contributes to the sound reproduction of a multichannel audio signal.

[0007] Fig. 1 schematically illustrates an example of a balance and fader control device for a vehicle-mounted multichannel audio signal broadcasting system according to the prior art.

[0008] According to this example, the device includes means for obtaining vehicle audio channels from a multichannel audio signal. For example, these means may take the form of a multichannel audio rendering matrix R that outputs vehicle audio channels whose contents constitute a sound reproduction of the multichannel audio signal when this multichannel audio signal is presented as input to this matrix R. The vehicle audio channels of the rendering matrix R form a signal vector Ve of dimension N (N is the number of vehicle audio channels). Each vehicle audio channel is amplified by a variable-gain amplifier Oi (i = 1 to N), that is, the content of each vehicle audio channel is amplified according to amplification gains associated with each of the vehicle audio channels.Each amplifier gain can be controlled, for example, by a human-machine interface of the multichannel audio signal distribution system, to adjust the balance and fader of the sound reproduction of the multichannel audio signal delivered by the vehicle's onboard speakers. For example, to achieve left / right balance in the sound reproduction, the amplifier gains of the amplifiers corresponding to the speakers located on the left or right side of the vehicle's cabin can be increased or decreased to modify the left / right balance of the sound reproduction. In some extreme situations, certain vehicle channels may even be completely attenuated, and the corresponding speakers may be "off."If, for example, a passenger in the vehicle wishes to play sound only in the front left of the vehicle, then the amplification gains corresponding to the front right, rear right and rear left speakers can be chosen so that the sound is produced by the vehicle's audio channel that corresponds to the front left speaker.

[0009] In a stereo audio signal (1 left audio channel and 1 right audio channel), all the sound content is contained within a left audio channel and a right audio channel. Therefore, there is little to no loss when extending a vehicle's audio channel, and adjusting the balance or fader using these traditional methods is satisfactory. However, these traditional methods prove inadequate for efficiently managing audio content when the number of vehicle audio channels increases. Indeed, the gradual switching off of some vehicle audio channels then leads to significant losses in sound reproduction. The content of each audio channel in these multichannel formats is necessary for the faithful reproduction of the sound experience. immersive, and its removal, even partial, can considerably degrade listening quality and therefore degrade the sound experience.

[0010] The integration of multichannel audio signals in vehicles therefore represents a revolution in in-car audio, promising an enriched and immersive listening experience. However, it requires a reassessment of balance and fader adjustment techniques to ensure that these multichannel signal delivery systems deliver their full potential without compromising sound quality. Summary of the present invention

[0011] One object of the present invention is to solve at least one of the problems of the technological background described above.

[0012] Another object of the present invention is to improve the left / right and front / rear balance adjustment of a multi-channel audio signal broadcasting system embedded in a vehicle.

[0013] According to a first aspect, the present invention relates to a method for controlling the balance adjustment of a multichannel audio signal broadcast in the passenger compartment of a vehicle, the method comprising the following steps: - obtaining vehicle audio channels from the multichannel audio signal; - obtaining as many amplified versions of each vehicle audio channel obtained as there are output channels contributing to a sound reproduction of the multichannel audio signal, each output channel being obtained by mixing one of the amplified versions of each of the vehicle audio channels obtained; - obtaining a desired balance setting; - obtaining an amplification gain value, to obtain each amplified version of each audio channel of the vehicle obtained, from a memorized amplification gain matrix taking as input the desired balance setting.

[0014] Such a method makes it possible to obtain a sound reproduction of a multichannel audio signal that preserves the essential content of the different channels composing the multichannel audio signal, regardless of the balance and fader settings. The quality of the sound reproduction is then superior to that obtained when the balance and fader adjustment is implemented by a prior art balance and fader adjustment device.

[0015] According to a second aspect, the present invention relates to a control device for adjusting the balance of a multichannel audio signal broadcast in the passenger compartment of a vehicle, the device comprising a memory associated with a processor configured for implementing the steps of the process according to the first aspect of the present invention.

[0016] According to a third aspect, the present invention relates to a vehicle, for example of the automobile type, comprising a device as described above according to the second aspect of the present invention.

[0017] According to a fourth aspect, the present invention relates to a computer program which includes instructions adapted for carrying out the steps of the process according to the first aspect of the present invention, in particular when the computer program is executed by at least one processor.

[0018] Such a computer program may use any programming language, and be in the form of source code, object code, or an intermediate code between source code and object code, such as in a partially compiled form, or in any other desirable form.

[0019] According to a fifth aspect, the present invention relates to a computer-readable recording medium on which is recorded a computer program comprising instructions for carrying out the steps of the process according to the first aspect of the present invention.

[0020] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium can include a storage means, such as a ROM, RAM, CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means or a hard disk drive.

[0021] On the other hand, this recording medium can also be a transmissible medium such as an electrical or optical signal, such a signal being able to be transmitted via an electrical or optical cable, by conventional or radio frequency, by self-directing laser beam, or by other means. The computer program according to the present invention can, in particular, be downloaded from an Internet-type network.

[0022] Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the process in question. Brief description of the figures

[0023] Other features and advantages of the present invention will become apparent from the description of the particular and non-limiting embodiments of the present invention below, with reference to the attached Figures 1 to 5, in which:

[0024] [Fig. 1] schematically illustrates an example of a balance and fader control device for a multi-channel audio signal broadcasting system on board a vehicle according to the prior art.

[0025] [Fig.2] schematically illustrates an example of a vehicle 10 incorporating a multi-channel audio signal diffusion system according to a particular and non-limiting embodiment of the present invention.

[0026] [Fig.3] schematically illustrates an example of a balance and fader control system for a multichannel audio signal broadcasting system according to a particular and non-limiting embodiment of the present invention.

[0027] [Fig.4] schematically illustrates a device configured to control a balance and fader setting of a multichannel audio signal broadcasting system according to a particular and non-limiting embodiment of the present invention.

[0028] [Fig.5] illustrates a flowchart of the different stages of a process for controlling the adjustment of balances of a system for broadcasting a multi-channel audio signal in a vehicle's passenger compartment, according to a particular and non-limiting embodiment of the present invention. Description of examples of achievements

[0029] A method and device for controlling balance settings of a broadcast multichannel audio signal will now be described in what follows with joint reference to Figures 1 to 5. The same elements are identified with the same reference signs throughout the following description.

[0030] The terms "first," "second" (or "firsts," "seconds"), etc., are used in this document by arbitrary convention to allow for the identification and distinction of different elements (such as operations, means, etc.) implemented in the embodiments described below. Such elements may be distinct or correspond to a single element, depending on the embodiment.

[0031] According to a particular and non-limiting embodiment of the present invention, adjusting the balance and fader of multichannel signals by modifying amplification gains achieves a "projection," also called "reinjection," of the content of the vehicle's audio channels that one wishes to reduce / mute onto the other audio channels of the vehicle. The content of the vehicle's audio channels being reduced is thus transferred / added to the content of the other audio channels of the vehicle that remain fully active, i.e., unattenuated. Thus, content loss is limited, and the sound reproduction of the multichannel audio signal remains close to full reproduction.

[0032] Fig. 2 schematically illustrates an example of a vehicle 10 incorporating a multi-channel audio signal diffusion system according to a particular and non-limiting embodiment of the present invention.

[0033] Vehicle 10 corresponds for example to a land vehicle, for example a car, a truck, a bus, a utility vehicle.

[0034] The vehicle 10 includes a multi-channel audio signal distribution system comprising one or more loudspeakers, here the 4 loudspeakers 11 to 14 distributed in the passenger compartment of the vehicle 10. For example, loudspeaker 11, respectively 13, is located in the front-right, respectively front-left, part of the passenger compartment, typically in the doors or in the dashboard of the vehicle 10; loudspeaker 12 is located in the rear-right part, for example in a right rear door and loudspeaker 14 is located in the rear-left part, for example in a left rear door.

[0035] The present invention is not limited to a particular multichannel audio signal distribution system. For example, the number and / or arrangement of the loudspeakers can be arbitrary within the passenger compartment, provided that they are distributed throughout the passenger compartment so that the different audio channels of the vehicle can be distributed in different areas of the passenger compartment.

[0036] The multichannel audio signal distribution system further includes a computer configured to control the balance and fader settings of the speakers installed in the vehicle 10.

[0037] The computer corresponds for example to the computer of the infotainment system, called the IVI computer (from the English "In-Vehicle Infotainment" or in French "Infodivertissement étoilé") of the vehicle 10.

[0038] The multichannel audio signal distribution system further includes a human-machine interface (HMI) configured so that a user of the vehicle 10 can adjust the balance and fader of the multichannel audio signal. The HMI is configured to provide balance adjustments based on choices made, for example, by an operator or a user of the vehicle 10.

[0039] According to a particular and non-limiting embodiment, the multichannel audio signal distribution system may further include a touchscreen, for example, an LCD (Liquid Crystal Display), a TFT (Thin-Film Transistor), or an OLED (Organic Light-Emitting Diode). The touchscreen is configured to display content for an operator, the driver, and the vehicle passengers. The touchscreen is also configured to allow the driver and / or vehicle passengers to interact with one or more vehicle-mounted systems via a human-machine interface (HMI) displayed on the touchscreen 101.For example, the touchscreen is configured to interact with the IVI system to adjust the balance and fader of the multichannel audio signal.

[0040] According to a particular embodiment, the vehicle 10 carries one or more embedded systems, each controlled by one or more computers. These computers, together with the IVI computer, form, for example, a multiplexed architecture for providing various services useful for the proper functioning of the vehicle and for assisting the driver and / or passengers in controlling the vehicle by controlling the embedded system(s).Computers communicate and exchange data with each other via one or more computer buses, for example a CAN (Controller Area Network), CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (according to ISO 17458), LIN (Local Interconnect Network), or Ethernet (according to ISO / IEC 802-3) type communication bus.

[0041] Fig. 3 schematically illustrates an example of a balance and fader control device for a multichannel audio signal broadcast in the passenger compartment of the vehicle 10 according to a particular and non-limiting embodiment of the present invention.

[0042] In a first operation, the device obtains audio channels from the vehicle from the multichannel audio signal.

[0043] An audio channel in a multichannel audio signal represents one of the distinct sound tracks that make up the entire multichannel audio signal. A single-channel audio signal has only one channel. It is played identically by all speakers. A stereo audio signal has two audio channels: one for the left ear and one for the right ear. This creates a spatial sound effect. A multichannel audio signal has several channels, usually more than two, to create an immersive audio experience. Each audio channel in a multichannel audio signal can be processed separately and can contain different audio elements or specific aspects of the overall sound mix to create a realistic, enveloping listening experience.

[0044] According to one embodiment, the device includes a sound rendering matrix R which provides an audio signal per audio channel of the vehicle when this multichannel audio signal is presented as input to this sound rendering matrix.

[0045] According to the example in [Fig. 3], the device comprises a sound rendering matrix R which outputs a signal vector Ve of N elements Ve(i) when the multichannel audio signal is presented as input. Each element Ve(i) (i = 1 to N) corresponds to a vehicle audio channel present at the output of this sound rendering matrix R. Each vehicle audio channel can correspond to a vehicle speaker 10 or to a subset of the speakers located in the vehicle's passenger compartment 10.

[0046] The device further comprises as many mixing devices Mi (i=l to N) as there are output channels contributing to the sound reproduction of the multichannel audio signal.

[0047] In a second operation, the device obtains as many amplified versions of each audio channel obtained as there are output channels.

[0048] According to the example in [Fig. 3], each vehicle audio channel (output of matrix R) is duplicated into as many versions as there are output channels. Each duplicated version j (j = 1 to N) of each vehicle audio channel i (i = 1 to N) is presented as the input to a variable-gain amplifier Oi,j (i = 1 to N, j = 1 to N). An amplified version at the output of each variable-gain amplifier Oi,j is presented as the input to a mixing device Mi (i = 1 to N) so that each mixing device Mi provides an output audio channel obtained by mixing one of the amplified versions of each of the resulting vehicle audio channels.

[0049] According to the example in [Fig. 3], N amplified versions of a first vehicle audio channel are obtained and amplified by N variable-gain amplifiers 01,j (j = 1 to N). N amplified versions of a second vehicle audio channel are obtained and amplified by N variable-gain amplifiers 02,j (j = 1 to N), and so on. In general, N amplified versions of a second vehicle audio channel (i = 1 to N) are obtained and amplified by N variable-gain amplifiers 01,j (j = 1 to N). Furthermore, an output channel provided by a mixing device Mk (k = 1 to N) is obtained by mixing the amplified versions at the outputs of the amplifiers 01,k (i = 1 to N).

[0050] In a third operation, a desired balance (and / or fader) setting is obtained, for example, from the HMI of the multichannel audio signal broadcasting system.

[0051] In a fourth operation, an amplification gain value for each amplified version of each vehicle audio channel is obtained from a stored MG amplification gain matrix taking as input the desired balance setting.

[0052] For example, the MG matrix is ​​stored in a memory of the vehicle 10.

[0053] The MG matrix is ​​designed to "project" ("reinject") contents of the vehicle's audio channels that are attenuated (or even turned off) following the balance adjustment to (to) other vehicle audio channels that are not attenuated.

[0054] Let us return to the example of [Fig. 3] with N = 4 and assuming that each of the four output channels is rendered by one of the four loudspeakers 11 to 14. For example, a first output channel is rendered on loudspeaker 11, a second output channel is rendered on loudspeaker 12, a third output channel is rendered on loudspeaker 13, and a fourth output channel is rendered on loudspeaker 14. The first output channel, provided by the mixing device M1, is obtained by mixing the amplified versions of the four output channels of the amplifiers O1,1 (i = 1 to 4). The second output channel, provided by the mixing device M2, is obtained by mixing the amplified versions of the four output channels of the amplifiers O1,2 (i = 1 to 4). The The third output channel, provided by the mixer M3, is obtained by mixing the amplified versions of the four output channels of amplifiers Oi,3 (i=l to 4). The fourth output channel, provided by the mixer M4, is obtained by mixing the amplified versions of the four output channels of amplifiers Oi,4 (i=l to 4). Now suppose that the resulting balance setting indicates that the multichannel audio signal should be played only on speakers 12 and 14, meaning that the first and third output channels should be muted. The MG matrix has been previously determined to address this situation and provides amplification gain values ​​for the different amplifiers Oi,j (i=l to 4, j=l to 4) to feed the contents of output channels 11 and 13 back to output channels 12 and 14.To this end, the MG matrix may have been determined so that the amplification gains of amplifiers Oi,l (i=l to 4) are set to zero to turn off the first output channel, and the amplification gains of amplifiers Oi,3 (i=l to 4) are set to zero to turn off the third output channel. The MG matrix may also have been determined so that the amplification gains of the other amplifiers are set so that the content that was to be output through the first and third output channels is now output through the second and fourth output channels. For example, the amplification gain of amplifier O1,2 is set to 1 (100% amplification) so that the content of the audio channel that was previously mixed by the mixer M1 is fed back into the input of the mixer M2 through the amplified version at the output of amplifier O1,2.The amplification gain of amplifier 01.4 can then be equal to 0.

[0055] The MG matrix can also be configured so that the feedback is distributed across several unattenuated output channels. For example, the amplification gain of amplifier 03,2 is set to 0.5 (50% amplification) so that the content of the audio channel previously mixed by mixing device M3 is partially fed back into the input of mixing device M2 through the amplified output version of amplifier 03,2. Furthermore, the amplification gain of amplifier 03,4 is set to 0.5 (50% amplification) so that the content of the audio channel previously mixed by mixing device M3 is partially fed back into the input of mixing device M4 through the amplified output version of amplifier 03,4.

[0056] Through these few examples, the person skilled in the art understands that the MG matrix is ​​not limited to these few examples but can be determined to respond to different situations related to balance adjustment which may involve more than four loudspeakers and amplification gain values ​​other than those mentioned in these examples.

[0057] For example, the MG matrix can be obtained empirically from tests carried out by an operator in an environment similar to that of the passenger compartment, for example of vehicle 10, for different balance and fader settings.

[0058] For example, the MG matrix can be stored in a memory of the vehicle 10.

[0059] For example, a balance and fader setting can be obtained by an operator or by a user of vehicle 10 from the HMI of the multi-channel audio signal broadcasting system.

[0060] Mathematically speaking, a signal vector Vs, each element of which Vs(i) (i=l to N) corresponds to an audio output channel, can result from the product of the matrix MG by the signal vector Ve. [00611 l",Mg[M]*Ve[j]

[0062] The MG matrix is ​​not always full and can in particular be equal to the identity matrix when the balance and the fader are in the center, that is to say that no area of ​​the passenger compartment of the vehicle 10 is privileged over another for the sound reproduction of the multichannel audio signal.

[0063] Figure 4 schematically illustrates a device 2 configured to control the balance and fader settings of a multichannel audio signal distribution system, according to a particular and non-limiting embodiment of the present invention. Device 2 corresponds, for example, to a device embedded in the vehicle 10, for example, a computer.

[0064] Device 2 is, for example, configured to carry out the operations described opposite Figures 2 and 3 and / or the steps of the process described opposite [Fig. 5]. Examples of such a device 2 include, but are not limited to, embedded electronic equipment such as a vehicle's on-board computer, an electronic control unit such as an ECU (Electronic Control Unit), a smartphone, a tablet, or a laptop computer. The elements of device 2, individually or in combination, can be integrated into a single integrated circuit, into several integrated circuits, and / or into discrete components. Device 2 can be implemented in the form of electronic circuits or software (or computer) modules, or a combination of electronic circuits and software modules.

[0065] The device 2 comprises one (or more) processor(s) 20 configured to execute instructions for carrying out the steps of the process and / or for executing the instructions of the software embedded in the device 2. The processor 20 may include integrated memory, an input / output interface, and various circuits known to those skilled in the art. The device 2 further comprises at least one memory 21 corresponding, for example, to volatile and / or non-volatile memory and / or includes a memory storage device which may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic or optical disk.

[0066] The computer code of the embedded software(s) including the instructions to be loaded and executed by the processor is for example stored on memory 21.

[0067] According to various specific and non-limiting embodiments, the device 2 is coupled in communication with other similar devices or systems and / or with communication devices, for example a TCU (Telematic Control Unit), for example via a communication bus or through dedicated input / output ports.

[0068] According to a particular and non-limiting embodiment, the device 2 includes a block 22 of interface elements for communicating with external devices, for example, a remote server or the cloud, other nodes of the ad hoc network. The interface elements of block 22 include one or more of the following interfaces: - radio frequency RF interface, for example of the Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or of the Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or of the Sigfox type using UBN (Ultra Narrow Band) radio technology, or LoRa in the 868 MHz frequency band, LTE (Long-Term Evolution), LTE-Advanced; - USB interface (from the English "Universal Serial Bus" or "Universal Serial Bus" in French); - HDMI interface (from the English "High Definition Multimedia Interface", or "High Definition Multimedia Interface" in French); - LIN interface (from the English "Local Interconnect Network", or in French "Réseau interconnecté local").

[0069] According to another particular and non-limiting embodiment, the device 2 includes a communication interface 23 which enables communication with other devices (such as other computers in the embedded system) via a communication channel 24. The communication interface 23 corresponds, for example, to a transmitter configured to transmit and receive information and / or data via the communication channel 24. The communication interface 23 corresponds, for example, to a wired CAN (Controller Area Network) or CAN FD (Controller Area Network Flexible Data-Rate) type network. flexible data rate”), FlexRay (standardized by ISO 17458) or Ethernet (standardized by ISO / IEC 802-3).

[0070] According to a particular and non-limiting embodiment, the device 2 can provide output signals to one or more external devices, such as a display screen 25, touch or not, one or more speakers 26 and / or other peripherals 27 (projection system) via output interfaces 28, 29, 30 respectively. According to a variant, one or more of the external devices is integrated into the device 2.

[0071] Figure 5 illustrates a flowchart of the different stages of a control process adjustment of balances of a multi-channel audio signal diffusion system in a vehicle passenger compartment, according to a particular and non-limiting embodiment of the present invention.

[0072] In a step 51, vehicle audio channels are obtained from the multichannel audio signal.

[0073] In a step 52, as many amplified versions of each audio channel of the vehicle obtained as there are output channels contributing to a sound reproduction of the multichannel audio signal, each output channel being obtained by mixing one of the amplified versions of each of the audio channels of the vehicle obtained.

[0074] In a step 53, a desired balance setting is obtained.

[0075] In step 54, an amplification gain value, to obtain each version amplified from each audio channel of the vehicle obtained, is obtained from a memorized amplification gain matrix taking as input the desired balance setting.

[0076] According to one variant, the variants and examples of the operations described in relation to Figures 2 and 3 apply to the steps of the process in [Fig. 5].

[0077] Of course, the present invention is not limited to the embodiments described above but extends to a method for controlling the balance adjustment of a multichannel audio signal distribution system in a vehicle's passenger compartment, which would include secondary steps without departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

[0078] The present invention also relates to a vehicle, for example an automobile or more generally an autonomous land-powered vehicle, comprising device 2 of [Fig.4].

Claims

Demands

1. A method for controlling the balance adjustment of a multichannel audio signal distribution system in a vehicle's passenger compartment, the method comprising the following steps: - obtaining (51) vehicle audio channels from the multichannel audio signal; - obtaining (52) as many amplified versions of each obtained vehicle audio channel as there are output channels contributing to a sound reproduction of the multichannel audio signal, each output channel being obtained by mixing one of the amplified versions of each of the obtained vehicle audio channels; - obtaining (53) a desired balance adjustment; - obtaining (54) an amplification gain value, to obtain each amplified version of each obtained vehicle audio channel, from a stored amplification gain matrix taking as input the desired balance adjustment.

2. Device (2) for controlling the adjustment of balances of a multi-channel audio signal diffusion system in a vehicle passenger compartment, said device (2) comprising a memory (21) associated with at least one processor (20) configured for carrying out the steps of the method according to claim 1.

3. A computer program comprising instructions for carrying out the method according to claim 1, when these instructions are executed by a processor.

4. Computer-readable recording medium on which is recorded a computer program comprising instructions for carrying out the steps of the process according to claim 1.

5. Vehicle comprising a device according to claim 2.

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