FR3091768A1 - VISUAL AND LATERALIZED NAVIGATION ASSISTANCE SYSTEM - Google Patents

Abstract

The invention relates to a visual and lateral navigation aid system comprising an electronic device 20 and two man-machine interfaces 10L, 10R. The electronic device 20 comprises a means of wireless communication 24 and a processing unit 21 for transmitting an orientation message. Each man-machine interface 10L, 10R comprises a main body encapsulating display means 15, a wireless communication means 14 and a processing unit 11. The display means 15 are driven by the processing unit 11 for display an IL, IR light indication in response to the orientation message. The man-machine interfaces 10L, 10R are distinct from one another and intended to be positioned respectively on the left and on the right of a user U. The electronic device 20 is adapted to send the orientation message to destination of a human-machine interface 10L and / or 10R depending on the orientation of a change of direction. Figure for the abstract: Fig. 1

Description

VISUAL AND LATERALIZED NAVIGATION ASSISTANCE SYSTEM

The invention relates to a visual and lateralized navigation aid system that can be used by the greatest number of us, regardless of the mode of travel and the space to be covered. The invention thus offers more particularly and in a non-limiting manner a valuable aid during hiking, cycling or skiing. The invention also remains relevant for delivering a navigation aid during a journey made on or in a motorized vehicle. Although particularly suitable for land travel, the invention can also be used during journeys made on the surface of the water or in the air.

Moving as freely as possible in space is a constant concern for humans. Freedom of movement does not, however, exclude a renunciation for some of comfort, the search for performance or even a form of serenity and safety during a journey to prevent, for example, any risk of getting lost during a hike in mountain, or any disappointment inherent in not having been able or able to access a remarkable point of view, through ignorance of a route or a site. Many solutions have been developed, from the simplest to the most sophisticated, to achieve this objective with varying degrees of success.

Thus, there are first of all solutions for marking routes, in the city or in the mountains. Directional signs are thus physically and regularly installed to provide a guide or a visual aid during navigation or a journey. In the mountains, markings are often used in the form of marks affixed to the ground, on rocks and/or on trees to indicate a recommended pedestrian or cycling route. This type of solution requires a relatively static and durable definition of said routes. Indeed, such marks and/or panels require human intervention to materialize any modification of the route. In addition, a hiker may not become aware of an erroneous orientation until very late at the risk of finding himself in an unfortunate position or exhausted by the obligation to make an unplanned detour.

Mainly in a road or motorway context, many vehicle drivers resort to a much more sophisticated complementary solution than marking or arrowing on the ground. Thus, a driver of a motorized land machine, such as a car or a passenger or goods carrier, can consult, when moving, a screen positioned within the passenger compartment of said machine, displaying, in real time , a traffic plan, in the form of a dynamic road map and disclosing in textual, semi-figurative and sound ways, orientation indications over a journey. For this, a vehicle is equipped, near the dashboard, with an electronic navigation aid device comprising a touch screen or not, of sufficient display size, generally of the order of a two tens of centimeters diagonally, so that the driver can follow and consult, albeit by diverting his attention somewhat from driving, visually and comfortably, the road map updated in real time. Such equipment also comprises a computer and satellite communication means in order to locate in space the location of the vehicle. The driver can, prior to his departure, enter a desired destination location and, according to configuration parameters stored in the memory of said equipment and reflecting certain preferences of said driver, such as recommending the shortest route in terms of distance or time, the route the most economical in terms of fuel, toll costs, etc., the computer of said equipment determines a relevant route and then provides graphical and sound indications of progress along the route. There are more minimalist versions in the form of portable equipment, dedicated to navigation, or even software applications, designed to adapt a smart mobile phone hosting such an application. Such mobile equipment thus adapted offers a similar solution in terms of functionalities while offering mobility allowing the user not to make his navigation aid equipment permanently resident within a given vehicle. Such mobile equipment generally cooperates with adapted support means ensuring maintenance and positioning of said equipment close to the driver's field of vision. Thus, brackets offer reversible fixing on a dashboard air vent, on a side window or on a vehicle windshield via a suction cup, for example. However, such solutions are expensive and require sophisticated and fragile equipment. In addition, the manufacturers or publishers of such solutions try to improve, day after day, the performance, the graphic rendering, the wealth of information delivered, to such an extent that the user sometimes has to make an intellectual effort to mentally extract a minority of relevant and necessary information for his orientation among a multitude of secondary information, some of which may divert his attention in his main mission of driving a vehicle.

Although certain manufacturers of vehicles comprising resident navigation aid equipment attempt to position, physically or virtually, the screen disclosing such indications so that it renders said graphic indications globally in the nominal field of vision of a driver when the latter looks at his road, the visual information remains concentrated in a single and same area of vision, reduced and delimited, of said visual field. In addition and in practice, a driver is generally and regularly forced to leave his natural posture of vision of the road to direct his gaze in the direction of the screen of the navigation aid device and consult the indications produced, at the risk not to anticipate an obstacle or lose control of your vehicle and cause an accident.

Other means of transport or modes of travel do not allow the use of such a navigation aid device. This is the case, for example, when traveling on foot, by bicycle or more generally on a motorized or non-motorized two-wheeler. Some operators have proposed positioning a mobile device on the frame, handlebars or stem of a bicycle, like the mobile devices mentioned above. For this, appropriate supports have been developed to ensure the maintenance for example of a mobile phone on a bicycle, or even a dedicated mobile device of reduced size with regard to what is found to equip a car. However, this type of electronic equipment is not designed to be weather and drop resistant. It can also be easily stolen by a malicious third party. A hiker generally prefers to shelter his precious equipment in a waterproof pocket and consult during breaks the progress of his journey at the risk of being led to deviate from the selected route. Other waterproof equipment that is more robust than a smart mobile phone is available. They include a screen capable of displaying figurative signs such as arrows for example. The dimensions of said screen are modest, that is to say a few centimeters in diameter or radius, so as not to hinder its user in its evolution. Some equipment is similar to a compass, which can be positioned in the center of the handlebars. Thus, a moving point of light displayed on the periphery of a circular dial indicates a relative direction. However, such an indication is all in all of low precision and semantics.

When such equipment is used by a pedestrian, the latter has no other solution than to hold it in his hand, on one of his arms, on his belt or on a piece of clothing.

In any case, it remains the responsibility of the hiker or cyclist to consult, wisely and at the appropriate time, his navigation aid equipment to read the orientation indications. Between two readings, said hiker was able to deviate from the route. So that a hiker does not put himself in danger, it is strongly recommended to consult such equipment only during a stop or a break. Indeed, the reading and translation of the information produced by the equipment are not instantly intelligible for said hiker, the latter being able to fall due to lack of concentration if he consults his equipment in motion. To prevent forgetting to consult, or even to avoid slowing down the journey by too regular stops, some equipment supplements the visual information with sound messages. To avoid causing any inconvenience to those around you, such an additional solution requires the use of headphones or earphones. Wearing this type of accessory can be uncomfortable when hiking or competing and listening to messages can be considered invasive for a walker looking for peace and quiet or for an athlete looking for concentration.

Far from the context of leisure or competition, helping the visually impaired to travel is also a subject of study. To supplement, or even supplant, the use of a cane making it possible not to hit an obstacle, the document WO2007/105937 discloses an electronic belt comprising a plurality of vibrating means distributed all around the abdominal belt of its wearer. The various vibrating means are controlled by a computer in response to indications or commands emanating from a navigation aid device cooperating with said computer. By means of a vibratory language, the wearer of the belt can interpret orientation instructions transmitted by such or such vibrating means. Such a solution is, however, cumbersome and not very usable by sighted hikers because it requires a certain learning curve in order to be able to interpret precise and complex indications. In addition, a hiker on a mountain bike may not perceive the vibrations drowned in the jolts caused by uneven terrain.

A hiker therefore has no other solution than to resort, at the present time, to navigation aid equipment that is not very suitable for his leisure, forcing him to consult a screen generally restoring graphic indications outside their natural field of vision, at the risk of getting lost and unnecessarily increasing an itinerary due to an inappropriate frequency of consultations, or even of falling or being injured by a loss of concentration linked to the reading and/or interpretation of instructions that are not very intuitive in the middle of piloting or progressing.

In summary, to date there is no technical and realistic solution offering equipment particularly suitable for outdoor recreation, distilling wisely and at the appropriate times non-invasive and particularly intuitive orientation indications for the hiker, all with great precision for a limited budget allowing to envisage a mass deployment.

The invention makes it possible to achieve such an objective by proposing a visual and lateralized navigation aid system, thus resolving the drawbacks of the known solutions. New perspectives in terms of hiking are thus within everyone's reach, whatever the mode of travel.

In the rest of the document, we will qualify as "lateralized" any signal or any information perceptible and/or positioned on or near an edge or on a side of a field of vision of a user of a system according to the invention. Thus, such a system confers a visual aid which can be described as "lateralized" since the visual indications delivered to said user are delivered laterally, that is to say, preferably and advantageously, on the left and/or on the right of said field of vision according to the content of an orientation instruction. The information is therefore delivered wisely to be instinctively perceived and interpreted by said user, so that the latter instinctively modifies his path without loss of concentration. On the other hand, a "non-lateralized" aid may consist of a visual indication, whether centralized or not, diffused within said field of vision, or even outside it - thereby requiring a loss of visual monitoring of the current path. , which requires non-instinctive and therefore indirect user interpretation. By way of example, a display of an indication in the form of a menu or else in a literal or figurative form, located in the center of the field of vision or on one of the sides thereof, in an undifferentiated manner whatever the nature of the said indication, will not be considered as a "lateralized" indication or aid.

In the same way, we will use in this document the term “direction” to qualify a current path taken by a user of a system according to the invention. A “direction” therefore encompasses indiscriminately the notions of trajectory, when a movement is carried out in the absence of a road or physical track, or of a path as such. Thus, in the remainder of the document, the terms "change of direction" are similar to and encompass the notion of inflection or modification of a trajectory or of a selection of a path from among a plurality of possible paths downstream of the current path.

Finally, we will use the term "orientation instruction" to encompass the notion of instruction aimed at modifying a current direction, as defined above, that is to say a selection of a path downstream, a change in a trajectory, possibly including a degree or more generally any additional and useful information for the user to carry out a recommended change of direction in a relevant manner.

Among the many advantages provided by the invention, we can mention that:
- The indications delivered by a navigation aid system according to the invention are directly intelligible by its recipient because it is visible at any time and particularly intuitive;
- the user of such a system benefits from precise and rich assistance without any negative feelings leading to loss of concentration or a feeling of invasion;
- the use of such a system maintains a very high degree of serenity and attention for the driver or hiker using said system;
- According to the embodiment, a system according to the invention does not require any structural modification of clothing or of vehicle elements, or even of support, to use said system;
- Different packaging modes of a system according to the invention are possible and allow to decline configurations suitable for recreation, sports or more generally trips envisaged;
- the preferred embodiment in the form of a pair of bracelets communicating with an adapted smart mobile phone by loading an appropriate application, ensures the provision of very economical, robust, fun and high-performance equipment for the biggest number.

To this end, a visual and lateralized navigation aid system is provided comprising an electronic device, a first man-machine interface and a second man-machine interface, said electronic device comprising a means of communication and a processing unit arranged to produce an orientation instruction, develop and transmit an orientation instruction message encoding said orientation instruction to said first and second man-machine interfaces. Each of said first and second man-machine interfaces comprises a main body encapsulating display means, communication means and a processing unit, said display means being controlled by said processing unit of the first man-machine interface for displaying a luminous indication in response to the reception and decoding of said orientation instruction message received from the communication means of the electronic device.

To offer a lateralized visual aid and thus guide a user in a perfectly intuitive and non-invasive manner, the first and second man-machine interfaces are separate from each other and intended to be positioned respectively on the left and on the right in a user's field of vision. The means of communication of the electronic device and of the first and second man-machine interfaces are wireless communication interfaces In addition, the electronic device of such a system is suitable for transmitting the orientation instruction message to the first interface man-machine and/or of the second man-machine interface according to the orientation of the change of direction concerned by said orientation instruction.

To facilitate the implementation by the user of the system, the main body of each of the first and second man-machine interfaces can comprise a fixing element making it possible to fix the first and second man-machine interfaces respectively on the left and on the right of the system user's field of vision.

By way of preferred but non-limiting packaging, the fixing element of the main body of each man-machine interface can cooperate with the handlebars of a two-wheeled vehicle.

Independently of such conditioning, in order to deliver relevant light indications and promote the lateralization of the perception of said indications by the user, the electronic device can elaborate and trigger the emission of an orientation instruction message intended for the first man-machine interface if the change of direction concerned by said orientation instruction induces a direction orientation to the left of said user. Conversely, said electronic device can generate and trigger the transmission of an orientation setpoint message intended for the second man-machine interface if the change of orientation concerned by said orientation setpoint induces a direction orientation to the right of said user.

By way of preferred embodiment, so that the user of a system in accordance with the invention can effortlessly interpret a guidance instruction and anticipate a possible change of direction, the display means of the first and second human interfaces -machines can advantageously comprise first and second display spaces, respectively controlled by the processing unit of the man-machine interface concerned, to display a lateralized light signal of orientation and a time gauge reflecting the imminence of the change direction indicated by said first display space. For this, the orientation setpoint message advantageously includes a datum of time expiry of the change of direction, the value of which defines said imminence of the change of direction.

To achieve an effective, robust and particularly economical solution, said first and second display spaces may consist respectively of two series of at least one light-emitting diode.

To complete the information delivered to the user and thus reduce the risk of uncertainty or erroneous interpretation, in particular during a change of direction in the presence of numerous possible directions, the display means of the first and second human interfaces -machines may comprise a display space, controlled by the processing unit of the man-machine interface concerned, to display a figurative symbol from among a plurality of determined symbols. For this, the orientation instruction message comprises an additional field whose value designates said figurative symbol from among said determined plurality of symbols.

In order to ensure that an orientation instruction, although translated into a lateralized visual indication, is not omitted by the user of an aid system according to the invention, the first and second man-machine interfaces can include alert means as to the imminence of a change of direction, said alert means broadcasting information of a nature other than light, and being actuated by the processing unit of the man-machine interface having received the orientation instruction message when the imminence of a change of direction deduced from said message reaches a determined threshold.

To produce relevant and precise instructions linked to the current terrestrial location of the user of a system according to the invention, the electronic device may comprise second communication means for collecting data from at least one distant satellite and for wherein the processing unit of said electronic device uses said data to determine the terrestrial position of said electronic device.

According to an embodiment minimizing the number of elements necessary for the implementation of the solution, the invention provides that the electronic device and one of the two man-machine interfaces can constitute only one and the same physical entity .

On the other hand, when the electronic device and the man-machine interfaces remain separate, said electronic device may be an intelligent mobile telephone comprising a program memory cooperating with the processing unit of said electronic device and recording instructions of an application program whose the execution or interpretation by said processing unit causes the implementation of a method for generating an orientation instruction message intended for one of the two man-machine interfaces.

According to another aspect, the invention provides a pair of man-machine interfaces of a visual and lateralized navigation aid system intended to cooperate with an electronic device comprising a wireless communication means, a processing unit arranged to produce an orientation setpoint, develop and transmit an orientation setpoint message encoding said orientation setpoint to said pair of man-machine interfaces. Each of said man-machine interfaces of said pair comprises a main body encapsulating a wireless communication means, a processing unit, and display means. The wireless communication means is configured to receive one or more orientation instruction messages from the electronic device. The processing unit is configured to decode the orientation instruction messages received by the communication means. The display means are controlled by said processing unit to display a light indication in response to the reception and decoding of an orientation instruction message. The human-machine interfaces are distinct from each other and intended to be positioned respectively on the left and on the right in a user's field of vision.

Thus, according to a second object, the invention provides such a method for generating an orientation instruction message implemented by the processing unit of an electronic device of a visual and lateralized aid system. Such a process includes:
- a step for determining a guide route;
- a step for determining the terrestrial position of said electronic device;
- a step to develop an orientation instruction;
- a step for encoding said orientation instruction in the form of an orientation instruction message and transmitting said message to one of the two man-machine interfaces of said system, said message comprising an orientation datum whose value denotes a particular change of direction.

So that only the appropriate man-machine interface among the two is solicited during a change of direction, said step for encoding said orientation instruction in the form of an orientation instruction message and transmitting said message consists in developing and transmitting said orientation instruction message to one of the two man-machine interfaces of said system according to the orientation of the change of direction concerned by the orientation instruction.

To adapt an electronic device so that it operates within a visual and lateralized navigation aid system according to the invention, there is also provided a computer program product comprising a plurality of program instructions which, when they are previously loaded into the program memory of an electronic device of such a system and then executed or interpreted by the processing unit of said electronic device, causes the implementation of a method for generating a message orientation setpoint as mentioned above.

Other characteristics and advantages will appear more clearly on reading the following description and examining the accompanying figures, including:

describes an example of the architecture of a navigation aid system according to the invention comprising two man-machine interfaces communicating with an adapted smart mobile telephone by implementing an appropriate application;

describes a functional example of a method for restoring an orientation indication implemented by one of said man-machine interfaces of a navigation aid system according to FIG. 1;

describes an example of a method for generating instruction messages implemented by an electronic device of a navigation aid system in accordance with the invention, said device possibly being the smart mobile telephone described in connection with FIG. 1 or as a variant integrated into one of the man-machine interfaces also described in FIG. 1;

presents a schematic view of an exemplary embodiment of means for displaying lateralized visual indications of a home-machine interface of a navigation aid system according to the invention, including several non-exhaustive examples of information figurative optionally displayed by the man-machine interface;

presents a three-dimensional view of one of the two man-machine interfaces of a navigation aid system in accordance with the invention in the form of a communicating electronic bracelet.

detailed description

FIG. 1 presents a simplified architecture of a first embodiment of a visual and lateralized navigation aid system according to the invention. Such a system comprises two man-machine interfaces 10L and 10R, for example in the form of two communicating electronic bracelets such as the one described later in connection with FIG. 5. According to this first embodiment, the two man-machine interfaces 10L and 10R are similar in their architecture and operation. Also, FIG. 1 presents, for simplification, only a detailed view of the means included in the man-machine interface 10L. This comprises a processing unit 11, in the form of one or more computers or microcontrollers cooperating by means of communication buses, symbolized by double arrows in FIG. 1, with a program memory 13 and a data memory 12 Said memories 12 and 13 may constitute only one and the same physical entity or be physically or logically separate. The program memory 13 is provided for recording in particular instructions of a computer program product P10. Said program instructions can be interpreted or executed by the processing unit 11 and cause the implementation of a method for restoring an indication of orientation IL, IR or IC, such as the method 100 described later in connection with FIG. 2. The processing unit 11 also cooperates with first communication means 14 responsible for ensuring communication C1, advantageously but not limitatively wireless, with a remote electronic device 20. Such communication C1 can be implemented, for example by relying on a proximity wireless communication protocol such as Bluetooth, ZigBee, iBeacon or any other equivalent protocol or technology. As a variant, such a communication C1 can be implemented by wire via a communication of the USB type (Universal Serial Bus, according to an English terminology) for example. To graphically restore an orientation indication to a human user U, a man-machine interface 10L or 10R further comprises display means 15, in the form of one or more screens of sizes deliberately reduced to their simplest expressions. . Such display means 15 may consist, by way of non-limiting examples, of two, or even three, display spaces. The first display space 15-1 may consist of one or more light-emitting diodes or of an advantageously flexible screen to reduce the risk of breakage in the event of a fall, for example, liquid crystals, or any other equivalent. FIG. 4A, described more precisely and subsequently in conjunction with FIG. 2, describes an example embodiment of such a first display space 15-1 in the form of a row of five light-emitting diodes. Such a diode is symbolized by a square with rounded edges. It can be turned off, said symbol is then white. Said diode can be illuminated, said symbol is in this case black in color. The main function of this first display space 15-1 is to deliver a first lateralized light signal of orientation IL to the user U. Thus, if said user U conveys or carries the two man-machine interfaces 10L and 10R respectively at the level of these two wrists, for example when said man-machine interfaces 10L and 10R consist of two separate electronic bracelets such as that described in FIG. 5, said user U knows immediately and instinctively that he must take a direction to his left when the first display space 15-1 of the interface 10L positioned on his left wrist delivers a light signal IL. Conversely, the user knows that he must take a direction to his right when the first display space 15-1 of the man-machine interface 10R which is positioned at his right wrist, delivers such an IR light signal. The IL or IR light information is instantly taken into account by the user because the latter, for example in the case of a cyclist, has his forearms in his field of vision at all times, his hands resting on his handlebars. The information delivered by the man-machine interfaces 10L and 10R are therefore present in said field of vision. The light signal IL or IR being lateralized (that is to say that only one man-machine interface among the two man-machine interfaces 10L and 10R does not deliver such a light signal at a given moment, apart from any signaling guidance incident) the brain of the user U instantly assimilates such information, in a completely intuitive manner without any mental effort. When the two man-machine interfaces 10L and 10R simultaneously deliver light information, we will see that this can signify a loss of roaming. Such joint light information, which we can qualify as "contradictory", will also be instantly taken into account by the user U, forcing him to question himself.

A change of direction is information that the user U of the system should advantageously anticipate. For this, a man-machine interface 10L or 10R in accordance with the invention comprises a second display space 15-2. This may be similar in nature to the previous first display space 15-1, as described, by way of non-limiting example, in FIG. 4A. Such a second display space 15-2 can thus be constituted by a row of light-emitting diodes or a screen. On the other hand, its function is similar to a time gauge reflecting the imminence of a change of direction indicated by the first display space 15-1. Thus, the brighter said time gauge, that is to say the greater the number of light-emitting diodes lit, the more imminent the change of direction. FIG. 4A thus shows light information IL or IR at three distinct instants t1, t2 and t3. At time t1, the man-machine interface 10L or 10R concerned does not deliver any light information. The two display spaces 15-1 and 15-2 respectively consist of two rows of five extinguished light-emitting diodes. At time t2, the first display space 15-1 delivers clear light information (the five diodes constituting it are lit). The user then knows that a change of direction is near. The time gauge indicates (two of the five diodes are lit) that said change should occur in n seconds, for example sixteen seconds. A third diode would be lit four seconds later for example and so on. When said change must occur, instant t3 in FIG. 4, the five diodes of the time gauge are lit, thus warning the user U that he must make the change of direction, on his left, if it is the interface man-machine 10L positioned on the left of its field of vision which delivers this light information IL, or vice versa, on its right, if it is the man-machine interface 10R, positioned on the right of said field of vision , which delivers said IR visual information. Any other process or technique could alternatively be implemented to materialize and display such a time gauge. The same is true for the durations associated with said gauge. Indeed, if the hiker is on foot, it will be possible to determine, that is to say to parameterize, the temporal gradient of the gauge, for example by requesting an input means, such as a push button 18 or a microphone or any other equivalent means, for transmitting parameters Pu to the processing unit 11. Such preferences Pu are recorded in the data memory 12. The user preferences Pu can also emanate from the electronic device 20 in communication with the two human interfaces. 10L and 10R machine, as we will describe later.

Confidential tests have demonstrated that it is possible to use the first display space 15-1 as an indicator of a degree of change of direction and thus inform a user U in the presence of a plurality of possible paths. In this case, the invention provides, like the time gauge described in connection with the second display space 15-2, that the first space 15-1 can describe a directional gauge. The more said directional gauge is illuminated (that is to say the greater the number of light-emitting diodes composing, by way of non-limiting example, said first display space), the more the change of direction must be marked with regard to the current direction. Other tests showed a loss of intuitiveness and instinctual perception of such IL or IR information. Thus, a preferred embodiment of display means 15 may consist in providing a third optional display space 15-3, preferably in the form of a screen capable of displaying figurative symbols, such as symbols S1 to S5 illustrated by FIG. 4B by way of non-limiting and non-exhaustive examples. In this case, the first display space 15-1 remains basic and boolean, that is to say a simple and clear light signal (all the diodes are off in the absence of signaling or on to indicate a change of direction), and this information is supplemented by the optional display of an additional symbol by the third display space 15-3.

FIG. 4B thus presents a few non-exhaustive examples of symbols whose display can be triggered by the processing unit 11 of a man-machine interface in accordance with the invention, such as those 10L and 10R described in connection with FIGS. 1 and 5.

A first example of a symbol, referenced S1 in FIG. 4B, indicates to move slightly to the right with regard to the current trajectory. A second example S2 instructs user U to simply turn right. The symbol S3 can indicate that said change of direction on the right of the user must be clearly marked. Finally, a fourth example of figurative symbol S4 can indicate a virtual U-turn to be made to the right. To facilitate, if necessary, the instinctive understanding of the visual information produced, the invention provides that said symbols can be displayed by the man-machine interface positioned in the left sector of the user's field of vision, presenting an axial symmetry vertical with regard to the examples described in connection with FIG. 4B, so that the arrows indicated are oriented towards the left of the third display space 15-3 of said man-machine interface. Alternatively, said symbols may be identical. Figure 4B also depicts a fifth example of symbol S5 in the form of a number, in this case the number '2'. Such use of numbers, instead of figurative symbols S1 to S4, as described previously, can be clever to indicate the rank of an exit from a roundabout, for example. Thus, said symbol S5 describing the number '2' can indicate to take the second exit.

The invention also provides, to increase the lateralization of the visual information delivered to a user, that the display means 15 of the first 10L and second 10R man-machine interfaces, respectively provided to be positioned on the left and on the right of the field of vision of said user, also have an axial symmetry. Thus, it is possible to provide for the third display space 15-3 to be arranged on the left of said display means 15 of the man-machine interface 10L and on the right of those of the IR interface. The same is true for the virtual “filling” directions of the temporal gauges 15-2, or even directional gauges 15-1. Any other ergonomic arrangement of said display means 15 aiming to reinforce the intuitiveness of the lateralized visual information IL and IR perceived by the user could as a variant or in addition be envisaged.

Whatever the arrangement chosen for making the display means 15 of the two man-machine interfaces 10L and 10R, the invention makes it possible to deliver timely, complete and relevant information to the user to guide him in his progress. The latter perceives, in his field of vision, that is to say without necessarily taking his gaze away from his current direction and therefore without loss of concentration, contrary to what the previous solutions impose, clear IL, IR information, linked to a change of direction, said information being lateralized and therefore directly and instinctively taken into account by the user, supplemented by a time gauge indicating the imminence of said change of direction, or even additional information during multiple possible routes in order to avoid any navigation error.

We can notice that the information is elementary and reduced to its simplest expressions. Particularly, when the display means 15 have only two display spaces 15-1 and 15-2, said display means 15 may consist of only two rows of a few light-emitting diodes, offering a particularly economical and robust.

Other confidential tests have shown, in particular during long and/or strenuous hikes, that the display spaces 15-1, 15-2, even 15-3 of the two interfaces 10L and 10R remain in the field of vision of a user of the navigation system, said user may be distracted and not perceive IL and/or IR light information delivered by one of the two man-machine interfaces 10L and 10R. The invention provides that such man-machine interfaces 10L or 10R may also include means 16 for alerting to an imminence of a change of direction, complementary to the display means 15. The nature of such additional alert means 16 is chosen so that they deliver a signal IC of a different nature than light, for example sound or preferably vibratory. Such means 16 can therefore consist of a loudspeaker, a beeper (or beeper or even buzzer according to Anglo-Saxon terminologies) or a mobile weight like a vibrator for a mobile telephone. Said means 16 cooperate with the processing unit 11 which drives them electronically. Said alert means 16 can be actuated by the processing unit 11, for example when the first display space 15-1 is actuated, therefore at the earliest, then when the time gauge 15-2 describes the time to effect said change of direction, such as time t3 described in connection with FIG. 4A.

Finally, the invention provides that a man-machine interface 10L or 10R may include a source or reserve of electrical energy, such as one or more batteries, sized to ensure the operation of the electronic components constituting said interface.

To implement a method for restoring an orientation indication, such as the method 100 that we will describe in connection with FIG. 2, and thus trigger the emission of lateralized visual information accompanied by additional perceptible signals of optional alerts, it is necessary to produce orientation instructions from the current position on the surface of the Earth of the user of the system or of the vehicle he is driving and from a route chosen by said user or generated in the purpose of reaching a given destination.

According to a first embodiment illustrated by FIG. 1, it is the task of a processing unit 21 of an electronic device 20 distinct from the man-machine interfaces 10L and 10R previously described, to produce, according to a method of which a example of functional description is illustrated by figure 3, to produce said orientation instructions, to encode them in the form of instruction messages mc and to trigger their transmission by first communication means 24 complementary to the communication means 14 said man-machine interfaces 10L or 10R. The joint use of said means 14 and 24 makes it possible to establish communication C1, advantageously but not limitatively, wirelessly between the electronic device 20 and the remote man-machine interfaces 10L and/or 10R. Such a communication C1 could be the ground for a joint implementation, by the electronic device 20 and the man-machine interfaces 10L and/or 10R, of a recognition and/or pairing procedure so that the entities 20 , 10L, 10R can exchange messages. Configuration or discovery messages, or even operating status messages, referenced mp in FIG. 1, can be exchanged according to conventional techniques in the field.

An electronic device 20 further comprises a program memory 23 and a data memory 22. Said memories 22 and 23 may constitute only one and the same physical entity or be physically or logically separated. The memory 23 is provided for recording in particular instructions of an application computer program product PA. Said program instructions can be interpreted or executed by the processing unit 21 and cause the implementation of a method for generating an orientation instruction message, such as the method 200 described later in connection with FIG. 3. The data memory 22 is for its part arranged to record user preferences, pre-established routes, etc. The data memories 22 and 12 also advantageously store identifiers specific to each element 20, 10L and 10R, or even secrets traditionally used to implement secure and/or confidential communication C1 mentioned above. All or only part of these identifiers and/or of said secrets recorded in the data memories 22 and 12 can be exchanged through said configuration messages mp.

To determine its current position on the surface of the Earth, an electronic device 20 further comprises second communication means 25, generally known by the term GPS (Global Positioning System) receivers for determining said location by triangulation from ms data transmitted by satellites. Said means 25 thus make it possible to establish such a remote communication C3 with a plurality of satellites, such as those referenced ST1 and ST2 in FIG. Earth location accurately. As a variant or in addition, said means of communication 25 can cooperate with other satellite systems such as, but not limited to, Galileo, GLONASS, or even Beidou. The means of communication 24 and 25 can constitute entities that are physically separate from each other or else constitute only one and the same physical entity.

The invention further provides variant embodiments of the electronic device 20 and of the man-machine interfaces 10L and 10R. A first variant may consist in simplifying the structure of one of the two man-machine interfaces 10L or 10R. Instead of being similar and/or identical, as previously mentioned, one of the two man-machine interfaces can be the slave of the other. For example, as shown in Figure 1, the man-machine interface 10L can be responsible for receiving any message mc or mp from the electronic device 20. When one of said messages transmitted to it is not relevant , in this case a message mc concerning an instruction in orientation to the right, said message mc is propagated, that is to say repeated, by the man-machine interface 10L to the sister man-machine interface 10R, via C2 communication, advantageously wireless or wired. For this, the man-machine interfaces 10L and 10R comprise second communication means 17 cooperating with their respective processing units 11 to encode and/or decode secondary setpoint messages mcs corresponding to propagated setpoint messages. According to a second variant, the processing unit 11 of the slave man-machine interface can be simplified to be no more than a signal controller controlling the display 15 and/or additional alert 16 means. in this case, it is the processing unit 11 of the master man-machine interface, in this case in the example represented in FIG. 1, the man-machine interface 10L, which produces the control signals for said means display 15 and/or alert 16 of the slave man-machine interface 10R. The communication C2 as well as the second means of communication 17 are then adapted and arranged accordingly. According to a third variant, the additional alert means 16 may only be present on the master man-machine interface 10L. The same is true for any input means 18, present also and only on the master man-machine interface 10L. The invention also provides for a fourth variant not described in FIG. 1, according to which the implementation of all or part of the processing carried out by the electronic device 20 can be carried out by the processing unit 11 of one of said human interfaces. -machine 10L or 10R. The invention even provides that the electronic device 20 and one of said man-machine interfaces 10L or 10R can form only one and the same physical entity. In this case, communication C1 is reduced to its simplest expression. The processing units 11 and 21 can also be combined, as well as the data memories 12 and 22, or even the program memories 13 and 23 mentioned above. Thus, one of said electronic bracelets, such as that described in connection with FIG. 5, is responsible for determining its current terrestrial position and for producing orientation instructions.

Let us now study, in conjunction with FIG. 2, an example of non-limiting embodiment of a method 100 for restoring an orientation indication implemented by a processing unit 11 of a man-machine interface conforming to the invention, such as the man-machine interfaces 10L and 10R described in connection with FIG.

Such a method 100 comprises a first step 101, prior to any restitution of an orientation indication, aimed at configuring the operation of said man-machine interface 10L or 10R. Such a step consists in taking into consideration any preferences Pu of the user U but also, in participating in a discovery procedure between the man-machine interface implementing said method 100 and the electronic device 20, via for example one or more messages referenced mp in FIG. 1, or even with a slave man-machine interface. This step 101 makes it possible in particular to determine, and to write in data memory 13, information characterizing the fact that the man-machine interface 10L or 10R whose processing unit 11 implements said method 100 is intended to be positioned on the left or on the right in the field of vision of the user U. The method 100, described by FIG. 2, comprises a first step 102 of a subsequent and iterative processing aiming to decode a setpoint message in orientation mc received by the first communication means 14. Such a message mc advantageously comprises several information fields such as an identifier of the recipient man-machine interface and concerned by said instruction message, an orientation datum whose predetermined value designates a change particular direction from among a set of possible pre-established changes, a time datum of the change of direction, or even additional and optional data.

Said iterative processing comprises a subsequent step 103 aimed at verifying that the man-machine interface, whose processing unit implements said method 100, is indeed the recipient of the instruction message in orientation mc received. Such verification may consist of comparing the value of the recipient's identifier contained in said message mc with that of the identifier specific to said man-machine interface, implementing said method 100, recorded for example in the data memory 12 If so, situation symbolized in FIG. 2 by the link referenced 103y, the method comprises a step 104 for extracting and recognizing the characteristics of the change of direction and its imminence with regard to the values of the data read from the instruction message mc at the view of a table of possible changes of direction advantageously recorded in data memory 12. The iterative processing of the method 100 therefore comprises a first step 105 for producing a control signal for the first display space 15-1 of the means for display 15. Step 105 thus consists in driving a display made up of a plurality of light-emitting diodes so that the latter light up, or in dec start the display of a graphic content produced or read in the data memory 12 by a screen 15-1. According to the example described in conjunction with FIG. 4A, the first display space 15-1 changes from a “diodes off” state at a time t1 prior to receipt of the setpoint message mc, to a “diodes lit” state as described at time t2. Parallel to step 105 or before or subsequently, the method 100 comprises a step 106 for producing a control signal for the second display space 15-2 of the display means 15. The step 106 thus consists in controlling a display consisting of a plurality of light-emitting diodes so that the latter light up, all or some of them, or to trigger the display of a graphic content produced or read in the data memory 12 by a screen constituting the display space 15-2. This step 106 consists in producing and triggering the display of the time gauge associated with the change of direction. According to the example described in connection with FIG. 4A, the second display space 15-2 passes from a state, “diodes off” at a time t1 prior to reception of the instruction message in orientation mc, to a state "illuminated diodes" such as those described at times t2 and t3 depending on the earliness of said change of direction.

Steps 105 and 106 can also be implemented in parallel, before or after an optional step 107 to control the additional warning means 16 if the man-machine interface includes them. Depending on the deadline for the change of direction extracted from the setpoint message mc, such a step 106 may consist of actuating said alert means 16 for a predetermined duration (for example one second) and an equally predetermined frequency. The invention provides that such an alert is effective only at certain times of change of direction. Thus, according to said deadline, no control signal for the alert means 16 may be produced while the first and second display spaces are actuated. For this, the invention provides one or more determined thresholds whose values can be written into the data memory 12, for example following the implementation of the configuration step 101 mentioned above. When the imminence of a change of direction deduced from an orientation instruction message mc reaches the value of one of said determined thresholds, step 106 is triggered. The same is true for a second optional step 108 aimed at activating the third display space if it exists. Such a step aims to control said third display space 15-3 so that the latter displays a graphic content elaborated or read in the data memory 12 by a screen. This step 108 consists in producing and triggering the display of one of the symbols described, by way of non-limiting examples in FIG. 4B, according to the characteristics of the change of orientation extracted in step 104 from the instruction message mc.

The iterative processing constituted by steps 102 to 108 is then terminated. The lateralized graphical information IL or IR restored by the display means 15 to the user U is maintained until the reception of a next setpoint message mc.

In the event that the processing unit 11 implementing such a method 100 has to control the second man-machine interface as a slave (situation symbolized by the link referenced 109y in FIG. 2), said method 100 may comprise a step 110 to produce a secondary setpoint message mcs, as mentioned previously, intended for said slave man-machine interface. A configuration test referenced 109 in FIG. 2 is provided for this purpose. Said steps 109 and 110 are implemented only if the test 103 has determined (situation symbolized by the link 103n in FIG. 2) that the instruction message mc received at step 102 was not intended for the human interface - master machine. In the event that said processing unit 11 implementing said method 100 does not have to manage setpoint messages intended for a slave man-machine interface (situation symbolized by the link 109n in FIG. 2), the processing iterative triggered at the end of step 102 is interrupted until the next reception of a setpoint message mc.

To trigger the implementation of a method for restoring a visual orientation indication IL, IR, or even vibrating IC, by a processing unit 11 of a man-machine interface according to the invention, such as the man-machine interfaces 10L and 10R described in connection with FIG. 1 implementing a method 100 described in connection with FIG. 2, the invention provides an electronic device 20, for example in the form of a smart mobile telephone, adapted to generate instruction messages in orientation mc intended for said man-machine interfaces 10L and 10R. Such adaptation resides, for example, in the loading of instructions of an application program PA whose execution or interpretation by the processing unit 21 of said electronic device 20 causes the implementation of a suitable method whose main characteristics are illustrated by the method 200 described in conjunction with Figure 3 by way of non-limiting example.

Such a method 200 comprises a first step 201 for determining or selecting a route along which a user wishes to be guided. For this, the processing unit 21 of the electronic device 20 triggers the display of one or more graphic or sound selection menus by display means, a loudspeaker and/or input means not shown in figure 1. These can consist of a touch screen, for example, or even a microphone. Such a method 200 can further comprise a step 202 for configuring the subsequent execution, by the processing unit 21, of the other steps of said method 200 according to one or more preferences of the user U. Such preferences can be translated by said means for displaying and/or inputting the electronic device 20 into one or more operating parameters, the respective values of which can advantageously be recorded in the data memory 22 of the electronic device 20. In this way, the user U of the device electronic device 20 can inform the processing unit 21 about its choices and preferences for selecting the shortest route with regard to a given destination, the route presenting the least difficulty, a periodicity and/or a delay, or even a given distance preceding a crossing of a characteristic point of the route to benefit from an orientation instruction, etc. To communicate and cooperate with the interfaces 10L and 10R (communication referenced C1 in FIG. 1), it is advantageous to implement a pairing or discovery protocol 203. Such a step is notably required if the communication C1 established between the different entities is said to be wireless. As a variant, such a step 203 could be optional if the communication C1 is wired. By way of non-limiting example, such a step 203 may consist in transmitting, via the means of communication 24, a discovery request, for example via a proximity wireless communication protocol of the Bluetooth type, and in waiting, in response , the reception of a message mp emanating from a man-machine interface 10L and/or 10R comprising the identifier of said man-machine interface or a secret or any other element which can characterize said interface. Such an exchange consists of the joint implementation of steps 201 by the processing unit 21 of the electronic device 20 and by step 101, mentioned previously, of a method 100 by the processing unit 11 of an interface man-machine 10L or 10R.

Steps 201, 202 and 203 having been carried out, a method for generating instruction messages in mc orientation, such as the method 200 illustrated by way of nonlimiting example in FIG. 3, now and advantageously comprises an iterative processing comprising a series of steps. The first step 204 consists in taking into consideration the terrestrial position of the electronic device 20. For this, the step 204 commands the processing unit 21 to collect data emitted by a plurality of satellites via the means 25 of GPS receivers or any equivalent. Knowing the desired route and determined in step 202, the respective terrestrial coordinates of a plurality of characteristic crossing points of which are recorded in data memory 22, a step 205 consists in producing an orientation instruction, intended to maintain the electronic device 20, therefore its user U, on the desired route, or even bringing said user U closer to the latter. The implementation of such a step 205 can be triggered at the end of a time period of predetermined duration or at the approach of one of said characteristic passage points mentioned previously. Thus, said step 205 determines whether the user must maintain his direction or inflect it. In the latter case, an orientation instruction is drawn up: head to the left, to the right, or even to turn around. Such an instruction can be enriched, in the case of a bifurcation or a crossroads, by determining a degree of inflection of the required trajectory or a path index (for example choosing the n ^th exit from 'a roundabout). When an orientation instruction aims to advise the user to orient himself on his left, a step 206 consists in encoding said orientation instruction drawn up in 205, in the form of an orientation instruction message mc intended for the man-machine interface provided to be positioned on the left of the user's field of vision, in this case the interface 10L. If, on the other hand, said orientation instruction relates to a change of direction advised on the right of said user, step 206 consists in generating an orientation instruction message mc intended for the man-machine interface positioned on the right of the field vision of said user, in this case according to Figure 1, the man-machine interface 10R. More generally, step 206 thus consists in triggering the transmission of a setpoint message in orientation mc intended for a first man-machine interface or a second man-machine interface, depending on the orientation of the change of direction concerned by the orientation instruction encoded by said message mc.

The invention provides that the step 205 can also determine that it is preferable for the user U to turn back, because the latter tends to move away inexorably from the recommended route. In this case, the step 206 can consist in developing and then transmitting two messages mc addressed respectively to the two man-machine interfaces 10L and 10R and encoding the same orientation instruction, for example of semantics “oblique your direction very frankly”. As the situation t3 in FIG. 4A indicates, the simultaneous taking into account of such an instruction by the two man-machine interfaces 10L and 10R spontaneously alert the user U. Faced with the concomitant visual indications IL and IR which would induce for the user contradictory and simultaneous instructions or actions, for example "turn left" and "turn right", the user understands in fact instantly that he is getting lost or that he is facing a guidance limit. He can then proceed to a U-turn or at least wonder about his current path. When the display means 15 of one of the two man-machine interfaces or when each of said interfaces comprises a third display space 15-3, the latter can display the symbol S4, described by way of example by FIG. 4B. In this case, the message mc produced at step 206 may include meta-information designating said symbol or predetermined characteristic information instructing each man-machine interface of the need for a U-turn.

Thus, such a step 206 consists in producing a message mc advantageously encoding several information fields such as an identifier of the man-machine interface recipient of said instruction message, an orientation datum whose predetermined value designates a change of orientation among a set of possible pre-established changes, a datum of the temporal expiry of the change of orientation, or even an additional and optional datum, referred to above as meta-information.

Steps 204, 205 and 206 are thus iterated until the user U reaches the destination.

The invention has been described preferably in connection with the configuration example of a system according to the invention presented by FIG. 1 comprising two man-machine interfaces 10L and 10R in the form of a bracelet or a show. FIG. 5 schematically illustrates in a very simplified manner an embodiment of a man-machine interface 10L or 10R in the advantageous form of a bracelet, the main body of which 10S constitutes a support for the organs 11 to 19 described previously and of which only the display means 15 comprising three display spaces 15-1, 15-2 and 15-3, as described by way of example in FIGS. 4A and 4B, are only shown for the sake of simplification. Said support 10S can be arranged to encapsulate the electronic components, in order to give them excellent protection against shocks and bad weather, with the exception of all or part of the "active face" of the display means 15, that is that is to say any visible part of a screen or of light-emitting diodes, to allow the visual transmission of the graphic indications delivered by said display means 15. Said body 10S can advantageously have a boss, not described in FIG. 5, to orient the display means further towards the user's field of vision. Said body 10S may further comprise any locking means, not described in FIG. 5, to adjust the bracelet 10L or 10R to the morphology of the user, as well as possibly a terminal block to allow the connection of a cable necessary for the recharging of the battery or batteries 19 necessary for the operation of the man-machine interface. Such recharging can also be provided by induction.

The invention cannot be limited to this single mode of packaging a man-machine interface. Thus, the main body 10S of such a man-machine interface can constitute all or part of a glove within which the user could slip a hand or more generally a garment thus adapted to convey one or two man-machine interfaces. machine 10L, 10R. As a variant, the body 10S of such a man-machine interface can be arranged to cooperate with the handlebars of a two-wheeled vehicle or any equivalent, such as a bicycle, a motorcycle, a motorized nautical vehicle, etc., and be advantageously fixed close to one of the distal parts of said handlebar, that is to say close to one of the grips of said handlebar. The lateralization of the visual information IL and IR delivered jointly by such man-machine interfaces 10L and 10R thus spaced from each other, respectively positioned on the left and on the right of the field of vision of the user of the two-wheelers, is therefore reinforced. Finally, said body 10S can also cooperate with or comprise fastening elements on a dashboard of a vehicle comprising a passenger compartment, for example a car, a truck, a boat, etc. Thus, two man-machine interfaces 10L and 10R can be arranged respectively on the left and on the right within the driver's field of vision. The invention also provides for arranging the body 10S of such a man-machine interface to satisfy the constraints imposed by other hobbies or sports. Thus, such a man-machine interface can be arranged to be positioned on an accessory, visually accessible in the field of vision of the user, such as a ski board close to the spatula or even the upper part of a stick. skier or hiker.

Claims (11)

Visual and lateral navigation aid system comprising an electronic device (20), a first man-machine interface (10L) and a second man-machine interface (10R), said electronic device (20) comprising a means of communication ( 24) and a processing unit (21) arranged to produce an orientation instruction, develop and transmit an orientation instruction message (mc) encoding said orientation instruction to said first and second man-machine interfaces (10L, 10R), characterized in that each of said first and second man-machine interfaces (10L, 10R) comprises a main body encapsulating display means (15), communication means (14) and a processing unit (11), said means display (15) being driven by said processing unit (11) of the first man-machine interface (10L) to display a luminous indication (IL, IR) in response to the reception and decoding of said message from c onsign in orientation (mc) received from the means of communication (24) of the electronic device (20), and in that:
the first and second man-machine interfaces (10L, 10R) are separate from each other and intended to be positioned respectively on the left and on the right in a field of vision of a user (U),
- the communication means (24, 14) of the electronic device (20) and of the first and second man-machine interfaces (10L, 10R) are wireless communication interfaces,
- the electronic device (20) is suitable for transmitting the orientation instruction message (mc) to the first man-machine interface (10L) and/or the second man-machine interface (10R) according to the orientation of the change of direction affected by said orientation instruction. System according to the preceding claim, in which the main body (10S) of each of the first and second man-machine interfaces (10L, 10R) comprises a fixing element making it possible to fix the first and second man-machine interfaces respectively on the left and on the right in the field of vision of the user (U) of the system. System according to the preceding claim, in which the fixing element of the main body (10S) of each man-machine interface (10L, 10R) cooperates with the handlebars of a two-wheeled vehicle. System according to Claims 1 to 3, for which the electronic device (20) elaborates and triggers the transmission of an orientation instruction message (mc) intended for the first man-machine interface (10L) if the change of direction concerned by said orientation instruction induces a steering orientation to the left of said user (U), or elaborates and triggers the transmission of an orientation instruction message (mc) intended for the second man-machine interface (10R) if the change of orientation concerned by said orientation instruction induces a direction orientation to the right of said user (U). System according to any one of the preceding claims, for which:
- the display means (15) of the first and second man-machine interfaces (10L, 10R) comprise first (15-1) and second (15-2) display spaces, respectively controlled by the processing unit (11) of the man-machine interface (10L, 10R) concerned to display a lateralized light signal of orientation and a time gauge reflecting the imminence of a change of direction indicated by said first display space (15- 1);
- the orientation instruction message (mc) comprising a datum of time expiry of the change of direction, the value of which defines said imminence of the change of direction. System according to the preceding claim, for which the first and second display spaces (15-1, 15-2) respectively consist of two series of at least one light-emitting diode. System according to one of Claims 1 to 4, for which:
- the display means (15) of the first and second man-machine interfaces (10L, 10R) comprise a display space (15-3) controlled by the processing unit (11) of the man-machine interface (10L, 10R) concerned to display a figurative symbol among a plurality of determined symbols;
- the orientation instruction message (mc) includes an additional field, the value of which designates said figurative symbol from among said determined plurality of symbols. System according to any one of Claims 1 to 8, for which the electronic device (20) is an intelligent mobile telephone comprising a program memory (23) cooperating with the processing unit (21) of the said electronic device (20) and recording instructions of an application program (AP) whose execution or interpretation by said processing unit (21) causes the implementation of a method (200) for generating an orientation instruction message ( mc) to one of the two man-machine interfaces (10L, 10R). Pair of man-machine interfaces (10L, 10R) of a visual and lateral navigation aid system intended to cooperate with an electronic device (20) comprising a wireless communication means (24), a processing unit (21) arranged to produce an orientation instruction, develop and transmit an orientation instruction message (mc) encoding said orientation instruction to said pair of man-machine interfaces (10L, 10R), each of said man-machine interfaces (10L, 10R) of said pair comprising a main body encapsulating:
- a wireless communication means (14) configured to receive one or more orientation instruction messages (mc) from the electronic device (20),
- a processing unit (11) configured to decode the orientation instruction messages (mc) received by the communication means (14),
- display means (15) controlled by said processing unit (11) for displaying a light indication (IL, IR) in response to the reception and decoding of an orientation instruction message (mc),
the man-machine interfaces being distinct from each other and intended to be positioned respectively on the left and on the right in a field of vision of a user (U). Pair of interfaces according to the preceding claim, in which the main body (10S) of each of the first and second man-machine interfaces (10L, 10R) comprises a fixing element making it possible to fix the first and second man-machine interfaces respectively to the left and on the right in the field of vision of the user (U) of the system. Pair of interfaces according to the preceding claim, in which the fixing element of the main body (10S) of each man-machine interface (10L, 10R) cooperates with the handlebars of a two-wheeled vehicle.