EQUIPMENT WITH AN ACOUSTIC ENCLOSURE WITH AT LEAST ONE AMPLIFIER

Description

[0001] The present invention relates to the field of equipment comprising a housing containing a box and having at least a first loudspeaker arranged inside the box to diffuse sounds towards the outside of the housing. BACKGROUND OF THE INVENTION

[0002] Such equipment integrates into a box containing electronic cards, a subwoofer having particular acoustic qualities, this equipment thus being particularly compact (because the subwoofer is integrated into the box, this subwoofer not being an external speaker to the box) and of improved sound quality since on the one hand the acoustic characteristics offered by the subwoofer are directly present in the box and since on the other hand the first loudspeaker receives an audio signal which is directly generated in the box for the first loudspeaker which is also located in the box.

[0003] However, it has been found that the presence of these elements in the same box can cause heating of electronic components.

[0004] In some cases, for example when listening at high power, the heating of certain electronic components can be detrimental to their performance.

[0005] To avoid the disadvantages of overheating, it is sometimes necessary to limit the power delivered to the first loudspeaker, which is detrimental to the listening experience. Documents US 2016 / 010846 A1, US 2020 / 100030 A1 and FR 3 110 797 A1 each disclose equipment comprising a housing in which there is a box housing a loudspeaker, electronic components placed in the housing outside the box and a connection device passing through a wall of the box and connected to the electronic components. SUBJECT OF THE INVENTION

[0006] An object of the invention is to provide equipment comprising a housing in which there is a box, a first loudspeaker arranged inside the box and a main electronic card placed in the housing, outside the box, the equipment making it possible to resolve or at least mitigate all or part of the aforementioned drawbacks of the prior art. SUMMARY OF THE INVENTION

[0007] For this purpose, according to the invention, there is proposed equipment comprising a housing in which there are: a box; a first loudspeaker arranged inside the box and mounted at a wall of the box, the first loudspeaker being arranged to diffuse sounds towards the outside of the housing; a main electronic card placed in the housing outside the box and on which is mounted at least one power supply module arranged to produce a first supply voltage; a connection device passing through the wall of the box;a secondary electronic card placed inside the box and on which is mounted at least a first amplifier connected to the first loudspeaker, the secondary electronic card being electrically connected to the main electronic card via the connection device, so that the first amplifier is powered by the first supply voltage, characterized in that the connection device comprises an intermediate card carrying a first plurality of electrical conductors for powering the first amplifier with the first supply voltage, the intermediate card and the electrical conductors of said first plurality of electrical conductors passing through an opening formed through the wall of the box. ;

[0008] The enclosure of the equipment according to the invention is an acoustic enclosure containing at least a first loudspeaker, this enclosure thus being intended for the diffusion of sounds from the first loudspeaker towards the exterior of the enclosure and more particularly towards the exterior of the housing of the equipment.

[0009] Thanks to the invention, the first amplifier and the first loudspeaker are located in the box, away from the main electronic board and away from the power supply module which are, in the housing, but outside the box.

[0010] In this way, the first amplifier is less subject to the thermal effects generated at the level of the main electronic board (the power supply module generates heat), and conversely, the main electronic board is less subject to the thermal effects generated at the level of the first amplifier.

[0011] The invention minimizes the need to limit the amplification gain of the first amplifier during its operation to avoid overheating.

[0012] As a corollary, the need to limit the sound power delivered by the first loudspeaker to avoid overheating is largely minimized by the invention.

[0013] Furthermore, the greater the distance between the first amplifier and the first loudspeaker, the greater the electromagnetic disturbances emitted or received along the connection between the first amplifier and the first loudspeaker.

[0014] By placing the first amplifier and the first loudspeaker in the same enclosure, the invention makes it possible to minimize the distance between the first amplifier and the first loudspeaker, which limits the level of electromagnetic interference emitted or received at the connection between the first connected amplifier and the first loudspeaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other characteristics and advantages of the invention will emerge clearly from the description given below, for information purposes only and in no way limiting, with reference to the appended drawings, in which: [ Fig. 1 ] there figure 1 is an exploded view of the equipment according to the invention; [ Fig. 2 ] there figure 2 is a perspective view of the equipment 0 according to the invention; [ Fig. 3a ] there figure 3a is a bottom view of the cover 19 of the equipment housing illustrating the position of the microphones 14a, 14b, 14c, 14d and the main heat sink 11 for dissipating heat generated at the main board 4; [ Fig. 3b ] there figure 3b is a perspective view from below of the upper cover 19 of the housing 1 of the equipment 0 where we see the main electronic card 4 and the connectors 43, 44 mounted on this card 4 and making it possible to connect the equipment 0 to elements external to the equipment; [ Fig. 3c ] there figure 3c is a side view of the hood 19 shown in the figure 3b where we see ribs 13 with notches 13a which allow the main card 4 to be wedged onto a rear portion of the housing 1 constituted by a rear face 18 of the upper cover 19; [ Fig. 4 ] there figure 4 is a perspective view of box 2 of equipment 0; [ Fig. 5a ] there figure 5a is a perspective view of the interior of the box 2 with the secondary card 6 which carries the first amplifier 6a (on this figure 5a , the part 24 forming the cover of the box 2 which comprises the upper, right, left, front and rear walls of the box is removed here); [ Fig. 5b ] there figure 5b is a side view of all the parts illustrated in the figure 5a , this figure 5b illustrating the typical inclination of a loudspeaker (here the front 3b) relative to the bottom plane Px defined by the bottom 1f of the housing 1; [ Fig. 6 ] there figure 6 is a top view of the bottom of the box serving as a heat sink and comprising for this purpose bosses 2f1, 2f2, 2f3 for receiving heat exchange materials intended to establish a heat transfer by conduction from components to be cooled towards the bottom of the box, this figure also shows internal walls 25 of the box 2 which each define sealed chambers 20a, 20, 20d, 20e each receiving a loudspeaker; [ Fig. 7a ] there figure 7a is a perspective view of equipment 0 cut along a plane P0 (visible on the figure 5a ), the equipment is illustrated without its top cover 19 to show the electrical connection between the main board 4 and the secondary board 6 via the intermediate board 5; [ Fig. 7b ] there figure 7b is a perspective view of equipment 0 cut along a plane P0 (visible on the figure 5a ), the equipment is illustrated without its top cover and without the main board for assembling the intermediate board 5 on the secondary board 6b before the box is closed with the part defining the top, right, left, front and rear walls of the box; [ Fig. 8 ] there figure 8 is a schematic view of the equipment according to the invention making it possible to illustrate a particular embodiment where the box 2 comprises a heat sink 10 arranged against the bottom 2f of the box 2, this figure 8 also illustrates the sound path 26 for diffusion of the sounds generated by the first loudspeaker 3a. DETAILED DESCRIPTION OF THE INVENTION

[0016] In reference to the figure 1 , the invention mainly concerns equipment 0 comprising a housing 1 in which there are: a box 2; a first loudspeaker 3a arranged inside the box 2 and mounted at a wall 2a of the box 2, the first loudspeaker 3a being arranged to diffuse sounds towards the outside of the housing 1; a main electronic card 4 placed in the housing 1 outside the box 2 and on which is mounted at least one power supply module 41 arranged to produce a first supply voltage; a connection device 5 passing through the wall 2a of the box 2; a secondary electronic card 6 placed inside the box 2 and on which is mounted at least one first amplifier 6a connected to the first loudspeaker 3a.

[0017] According to the invention, the secondary electronic card 6 is electrically connected to the main electronic card 4 via the connection device 5 so that the first amplifier 6a is powered by the first supply voltage.

[0018] Thus, the amplifier 6a (as well as the second amplifier 6b which will be presented later) is placed in the box 2, at a distance from the main electronic card 4 which is a “hot card” (i.e. a card whose components have significant thermal emission) carrying the power supply module 4.

[0019] Since these amplifiers 6a, 6b are not heated by the main board 4 and are better cooled, it is therefore possible to protect the amplifiers from heating due to the components present on the board 4 and it is also possible to use more powerful amplifiers without risking overheating.

[0020] For example, we can switch from a 12V amplifier supply voltage to a 16V supply voltage so as to get better use out of the first speaker 3a which is here a bass speaker (typically a speaker intended to reproduce frequencies below 1kHz, for example frequencies below 500Hz).

[0021] As the amplifiers are better cooled and less impacted by the heat output of other components, it is possible to operate them at higher power and it is also possible to choose amplifiers with higher power but lower efficiency (therefore having greater heat output for the same audio power output).

[0022] This can be useful, for example, if you want to change amplifier or component references while having a limited risk of overheating of these components.

[0023] The main electronic card 4 carries at least one processor 4b having a decoder function, memories, a power supply module 41 for generating at least a first supply voltage and an audio module 42.

[0024] As seen on the figures 1 , 7a , 7b And 8 , the connection device 5 comprises an intermediate card 5 carrying a first plurality of electrical conductors 50 for supplying the first amplifier 6a with the first supply voltage.

[0025] The intermediate card 5 and the electrical conductors 50 pass through an opening 20 formed through the wall 2a of the box 2.

[0026] Such an intermediate card 5 (preferably of the printed circuit board type) is more advantageous than a sheet of electrical conductors, because the card 5 is rigid and makes it possible to increase the cross-section of the electrical conductors 50 to obtain a better current flow capacity.

[0027] In addition, the assembly of an intermediate card 5, “rigid” with respect to a ribbon cable, is easier to carry out automatically than the assembly of a “flexible” ribbon cable, which requires human intervention. The main electronic card 4 carries a first mechanical connector 40 and the secondary electronic card 6 carries a second mechanical connector 60.

[0028] Intermediate card 5: carries on the one hand a first mechanical connector 51 removably connected to the first mechanical connector 40 carried by the main electronic card 4; and carries on the other hand a second mechanical connector 52 of the intermediate card 5 removably connected to the second mechanical connector 60 carried by the secondary electronic card 6; so that the first supply voltage is transmitted to the first amplifier 6a via: of the first mechanical connector 40 carried by the main electronic card 4; of the first and second mechanical connectors 51, 52 carried by the intermediate card 5; and by the second mechanical connector 60 carried by the secondary electronic card 6.

[0029] These mechanical connectors 40, 51, 52, 60 are electrically connected in series.

[0030] Here, the connectors 51 and 52 of the intermediate card 5 are produced by simple electrical tracks formed on terminal end portions of the intermediate card 5, these connectors 51, 52 here being of the male type.

[0031] Although these connectors 51 and 52 are simple tracks here, they could also be made with other more complex types of connector comprising additional parts with interlocking and / or keying devices.

[0032] Each of the electrical conductors 50 of the first plurality of electrical conductors carried by the intermediate card 5 has: a first clean end electrically connected to the first mechanical connector 51 carried by the intermediate card 5; and a second clean end electrically connected to the second mechanical connector 52 carried by the intermediate card 5.

[0033] In this way the electrical connection between the main electronic card 4 and the secondary electronic card 6 is made, reversibly, via the mechanical connectors 51, 52 electrically connected to each other via the first plurality of electrical conductors 50.

[0034] As the intermediate card 5 is rigid, its connection to the second mechanical connector 60 carried by the secondary card 6 makes it possible to spatially position the first mechanical connector 51 of the intermediate card 5 relative to the main electronic card 4.

[0035] Thus, the electrical connection between the main electronic card 4 and the secondary electronic card 6 is particularly easy to implement in an automated manner.

[0036] In the preferred embodiment illustrated in figure 7a , one of the first mechanical connectors 51 is a male type connector fitted into the other of said first mechanical connectors 40 which is a female type connector.

[0037] These first mechanical connectors 40, 51 are here connected to each other so as to present a first clearance allowing relative movement between these first mechanical connectors 40, 51.

[0038] Similarly, one of the second mechanical connectors 52 is a male type connector nested in the other of said second mechanical connectors 60 which is a female type connector.

[0039] These second mechanical connectors 52, 60 are here connected to each other so as to present a second clearance allowing relative movement between these second mechanical connectors 52, 60.

[0040] These first and second games between the connectors allow: better resistance in the event of accidental dropping of the equipment; and easier assembly of the intermediate card 5 with respect to the main 4 and secondary 6 electronic cards (which is favorable to the automation of the assembly process).

[0041] Preferably, the intermediate card 5 extends in length and width in a plane of the intermediate card 5 which is on the one hand perpendicular to a main plane of the main card 4 and on the other hand perpendicular to a front face 1b of the housing 1.

[0042] The 90° orientation of the intermediate card 5 relative to the front face 1b of the housing 1 contributes to the resistance of the equipment 0 to falls.

[0043] In fact, if the equipment is dropped, the shock most often occurs at the front of the case, i.e. along the plane of the intermediate card 5 (in the event of a drop, the connectors and card 5 are generally preserved).

[0044] Rigid card 5 can also contribute to the robustness of the equipment in the event of a fall, by preventing cards 4 and 6 from possibly coming together during an impact.

[0045] Preferably, the first and second mechanical connectors 51, 52 are identical to each other (in this case they are male connectors of the PCI express type) and the first and second mechanical connectors 40, 60 respectively carried by the main electronic card 4 and by the secondary electronic card 6 are also identical to each other (in this case they are female connectors of the PCI express type).

[0046] Having identical mechanical connectors reduces the number of component types needed to make the electrical connection between boards.

[0047] As illustrated on the figures 5a , 7a , 7b And 8, the intermediate card 5 is preferably of asymmetrical shape so that the electrical connection between the main electronic card 4 and the secondary electronic card 6 via the first plurality of electrical conductors 50 carried by the intermediate card 5 is possible in a single position / orientation of the intermediate card 5 relative to the main 4 and secondary 6 electronic cards.

[0048] The asymmetrical shape of the intermediate card 5 allows electrical connection between the cards only when the intermediate card is in its single position.

[0049] This asymmetrical shape prevents the intermediate card 5 from being positioned in any other position / orientation than the single position visible in the figures.

[0050] This asymmetrical shape of the intermediate card 5 allows mechanical keying which facilitates the assembly of the intermediate card while making it possible to assign to each electrical conductor 50 a unique function in the electrical connection between the main 4 and secondary 6 cards.

[0051] Thus, each electrical conductor 50 can be specifically developed / sized to carry a given current / signal / voltage dedicated to it.

[0052] In this case, as illustrated in the figures 1 , 5a , 7a , 7b And 8 , the asymmetry of the intermediate card 5 is obtained by an axial offset Dx between the two longitudinal ends of the intermediate card 5 (see for example the figure 8 ).

[0053] The first longitudinal end of the intermediate card 5 is essentially on one side of a longitudinal axis D of the intermediate card 5 while the other longitudinal end of the intermediate card is essentially on the other side of the longitudinal axis D of the intermediate card 5.

[0054] To increase the asymmetrical appearance of the intermediate card 5 and to facilitate recognition of the unique position in which it must be assembled, the intermediate card 5 also comprises: a first longitudinal edge cut in a step and formed along and on a first side of the longitudinal axis of the intermediate card; and a second longitudinal edge formed along and on a second side of the longitudinal axis, this second edge having a portion cut at 45° relative to the longitudinal axis of the intermediate card.

[0055] As we understand from the figures 7a And 8, the wall of the box is shaped to abut against the portion cut at 45° when the intermediate card 5 is in a position other than said single position illustrated in the figures.

[0056] Preferably, a compressible seal 7, visible on the figures 7a And 4 is arranged to oppose the passage of air between the inside and the outside of the box 2 via the opening 20 formed through the wall of the box 2.

[0057] This seal 7 ensures acoustic sealing of the box 2 at the level of the opening 20 through which the intermediate card 5 passes.

[0058] Preferably, this seal 7 rests against the main electronic card 4, the latter thus “closing” the acoustic volume of the box 2.

[0059] This seal 7 is preferably an annular seal which extends here around the first mechanical connector 40 carried by the main electronic card 4.

[0060] This seal 7 here comprises first and second faces formed on either side of the seal.

[0061] The first face of the seal bears against an annular bearing surface carried by the main electronic card 4 and the second face of the seal bears against an annular bearing surface carried by the wall 2a of the box 2.

[0062] The compression of the seal 7 between the annular bearing surface carried by the main electronic card and the annular bearing surface carried by the wall 2a of the box also makes it possible to absorb vibrations / slight movements of the main electronic card and the box 2.

[0063] Parasitic vibrations can thus be absorbed by the seal 7.

[0064] As illustrated in the figure 7a , an elastically deformable element 8, preferably made of foam, extends all around a longitudinal portion of the intermediate card 5, inside the opening 20 formed through the wall 2a of the box 2.

[0065] This elastically deformable element 8 makes it possible to oppose contact between the intermediate card 5 and the wall of the box 2.

[0066] Here, the elastically deformable element 8 (here a foam sleeve) surrounds a longitudinal portion of the intermediate card 5 to allow alignment of the intermediate card 5 relative to the opening 20.

[0067] This makes assembly of the intermediate board 5 easier.

[0068] This sleeve 8 thus makes it possible to absorb / dissipate vibrations and also makes it possible to oppose the passage of air along the intermediate card, via the opening 20.

[0069] The audio module 42 is placed in the housing 1, outside the box 2, and is arranged to produce a primary audio signal.

[0070] More specifically, the audio module 42 is mounted on the main electronic board 4 and is powered by said power supply module 41 via an electrical connection connecting the power supply module 41 to the audio module 42.

[0071] The audio module 42 is also connected to the secondary electronic card 6 so that when the primary audio signal is applied to the input of the first amplifier 6a and the first amplifier 6a is powered by said first voltage, the first amplifier 6a produces, from the primary audio signal, a first amplified audio signal intended for the first loudspeaker 3a.

[0072] The sounds broadcast by the first loudspeaker 3a are thus a function of the first amplified audio signal, this amplification being carried out in the box 2, as close as possible to the first loudspeaker 3a and at a distance from the main electronic card 4.

[0073] This limits the risk of electromagnetic interference of the first amplified audio signal, which is beneficial to the quality of the sounds broadcast by the equipment 0.

[0074] The audio module 42 is electrically connected to the secondary electronic card 6 via the connection device 5 so that the primary audio signal is transmitted from the audio module 42 to the first amplifier 6a via the connection device 5.

[0075] More particularly, the audio module 42 is electrically connected to the secondary electronic card 6 via audio electrical conductors carried by the intermediate card 5 so that said primary audio signal is transmitted from the audio module 42 to the first amplifier 6a via specific audio electrical conductors.

[0076] In this way, the intermediate board 5 carries electrical connectors dedicated to the transmission of the supply voltage to the first amplifier 6a and audio electrical conductors dedicated to the transmission of the primary audio signal to the first amplifier 6a, thus limiting the risk of disruption of the quality of the primary audio signal.

[0077] As illustrated on the different figures 1 , 4 , 5a à 8 , equipment 0 also includes: a right loudspeaker 3d arranged in a right inner chamber 20d of the box 2 open on a right lateral face 2d of the wall of the box 2; a left loudspeaker 3e arranged in a left inner chamber 20e of the box 2 open on a left lateral face 2e of the wall of the box 2; and a front loudspeaker 3b arranged in a front inner chamber 20b of the box 2 open on a front face 2b of the wall of the box 2.

[0078] The number and arrangement of these speakers could vary while remaining within the scope of the present invention.

[0079] Said first loudspeaker 3a is here a loudspeaker of the bass loudspeaker type (the bass sounds being mainly located between 20 and 500 Hz) arranged in a central interior chamber 20a of the box 2 arranged between the right and left interior chambers 20d, 20e of the box 2.

[0080] The central interior chamber 20a is open on the upper face 2a of the box, in the direction of the main electronic card 4.

[0081] The housing 1 has a rear face 1c which is open towards the outside of the housing 1 to diffuse the sounds coming from the first bass speaker 3a towards the outside of the housing.

[0082] The airflow generated by the sounds of the first speaker 3a thus contributes to the cooling of the main electronic card 4.

[0083] The right, left, front and central inner chambers 20a, 20b, 20d, 20e of the box are sealed against each other.

[0084] In this way, each chamber has an internal volume adapted to the main frequencies of the loudspeaker it contains.

[0085] Furthermore, the seal between the chambers promotes the separation of sounds generated by the different speakers.

[0086] Preferably: the right loudspeaker 3d has a main sound axis of its own, along which the sounds it generates are mainly diffused; the left loudspeaker 3e has a main sound axis of its own, along which the sounds it generates are mainly diffused; the front loudspeaker 3b has a main sound axis Ax of its own, along which the sounds it generates are mainly diffused.

[0087] As understood from the perspective views of the housing 1, 4, 7a and 7b and the sectional view of the figure 5b : on the one hand, the housing 1 comprises a housing bottom 1f defining a support plane Px of the housing (here the plane Px is defined by feet of the housing intended to support the equipment on a flat piece of furniture); and on the other hand, at least one of said main sound axes of the right, left and front loudspeakers is oriented relative to the support plane Px so that the sound mainly diffused along said at least one sound axis Ax gradually moves away from said support plane Px.

[0088] As it is understood from the figure 5b , the main sound axis Ax of the front loudspeaker 3b extends in a plane perpendicular to the support plane Px where it optionally forms a frontal angle A relative to the support plane Px.

[0089] This angle is between 2 and 40° angle, for example between 2 and 15° angle, preferably it is 3° angle.

[0090] Similarly, the main sound axis of the right loudspeaker 3d extends in a second plane perpendicular to the support plane Px where it optionally forms a right lateral angle with respect to the support plane Px which is between 2 and 50° angle, for example between 2 and 15° angle, preferably 3° angle.

[0091] Symmetrically, the main sound axis of the left loudspeaker 3rd extends in said second plane perpendicular to the support plane Px where it optionally forms a left lateral angle relative to the support plane Px which is between 2 and 50° angle, for example between 2 and 15° angle, preferably 3° angle.

[0092] Preferably, the right lateral angle and the left lateral angle have the same angle value.

[0093] With a main sound axis of a given loudspeaker forming, in a plane perpendicular to the support plane Px, an angle A, for example between 2 and 15° relative to the support plane Px, the sound tends to be diffused upwards relative to the support plane Px, that is to say gradually moving away from this support plane Px.

[0094] As the equipment according to the invention is intended to be positioned at the foot of the television screen, the equipment is most often in a fairly low position (between 50 and 80cm high) relative to the head of the user watching the television screen.

[0095] This positive vertical angle A partially compensates for the difference in height.

[0096] Optionally, it is possible to have lateral angles significantly greater than angle A in order to improve the spatial reproduction of the sounds emitted by the 3d and 3e loudspeakers (for example by taking advantage of sound reflections on the walls and ceiling of the room) while maintaining a direct sound path between the front loudspeaker 3b and the listener.

[0097] Optionally, the loudspeakers 3d and 3e have an angle between their main sound axis and the support plane Px, while the front loudspeaker 3b does not have an angle between its main sound axis and the support plane Px which are parallel to each other.

[0098] The angle of the 3d and 3e speakers could, for example, be between 15 and 90° (relative to the Px plane) while the angle of the front speaker 3b could, for example, be between 0 and 20° (relative to the Px plane).

[0099] Preferably, to limit the appearance of sound disturbances at the interface between the speakers and the housing: the main sound axis of the front loudspeaker is perpendicular to the front face of the housing; and / or the main sound axis of the right loudspeaker is perpendicular to the right side face of the housing or is perpendicular to the upper face of the housing; and / or the main sound axis of the left loudspeaker is perpendicular to the left side face of the housing or is perpendicular to the upper face of the housing; and / or the main sound axis of the first loudspeaker is perpendicular to the upper face 1a of the housing defined by an upper cover 19 of the housing.

[0100] Preferably: the front face 1b of the housing 1 has a plurality of sound diffusion perforations defining a front grille facing the front loudspeaker 3b; the right side face 1d of the housing 1 has a plurality of sound diffusion perforations defining a right side grille facing the right loudspeaker 3d; the left side face 1e of the housing 1 has a plurality of sound diffusion perforations defining a left side grille facing the left loudspeaker 3e; and the rear face 1c of the housing 1 has a plurality of sound diffusion perforations defining a rear grille for diffusing sounds generated by the first loudspeaker 3a (central loudspeaker of the bass loudspeaker type “woofer” whose membrane is oriented towards the main electronic board 4).

[0101] The box 2 comprises a lower face 2f extending mainly in a box bottom plane and in which: a flat portion of the right lateral face 2d of the wall of the box on which the right loudspeaker 3d is fixed forms an angle with the bottom plane of the box, measured inside the box, which is between 50 and 88° angle, preferably 77°; a flat portion of the left lateral face 2e of the wall of the box on which the left loudspeaker is fixed forms an angle with the bottom plane of the box, measured inside the box, which is between 50 and 88° angle, preferably 77°.

[0102] As illustrated in the figure 4 , the box 2 comprises a lower face 2f extending mainly in a bottom plane of the box, a flat portion of the front face 2b of the wall of the box on which the front loudspeaker 3b is fixed forms an angle with the bottom plane 2f, measured inside the box, this angle being between 50 and 88° angle, preferably 77°, but it could also be 90° for example in the case where it is not desired to orient the sound axis upwards.

[0103] As we understand from figures 4 , 5a , 5b And 7a , 7b , the flat portions of the right, left and front side faces of the wall of the box on which the right, left and front loudspeakers are respectively fixed are inclined relative to the bottom plane 2f of the box, which makes it possible to simply obtain the vertical inclination of each of the loudspeakers while bringing it closer to the inside of the box.

[0104] This particular embodiment allows for slightly upward-firing sounds while maximizing the internal volume of the enclosure.

[0105] This embodiment is particularly economical since it does not require a custom adaptation of each given loudspeaker nor the use of an inclined spacer between the cabinet and each given loudspeaker.

[0106] Preferably, a second amplifier 6b is mounted on the secondary electronic card 6 and is connected to at least one of said right, left, front loudspeakers, said second amplifier 6b being electrically connected to said power supply module 41 via the connection device 5 (in this case via the card 5), so that the second amplifier 6b is electrically powered by the power supply module 41 mounted on the main electronic card 4.

[0107] The electrical power supply of the second amplifier 6b passes through electrical conductors 50 carried by the intermediate card 5 and by each of said mechanical connectors 40, 51, 52, 60.

[0108] The audio module 42 is preferably arranged to produce a secondary audio signal.

[0109] This audio module 42 is connected to the secondary electronic card 6 so that when the secondary audio signal is applied to the input of the second amplifier 6b and the second amplifier is electrically powered by the power supply module 41, the second amplifier 6b then produces, from the secondary audio signal, a second amplified audio signal intended for at least one of said right, left and front speakers.

[0110] To cope with occasional power demands from one and / or the other of the amplifiers 6a, 6b, the secondary card 6 carries at least one energy reserve capacitor 6d (also called a power capacitor) electrically powered by the power supply module 41 via the connection device 5 passing through the wall 2a of the box 2.

[0111] Said at least one capacitor 6d is furthermore electrically connected to said at least one first amplifier 6a so as to supply energy to said at least one first amplifier and possibly to the second amplifier.

[0112] In the embodiment of the invention where the secondary card carries two amplifiers 6a, 6b, it is preferable to have a capacitor per amplifier to prevent a one-off power demand by the first amplifier 6a dedicated to the bass speaker 3a from interfering with the operation of the second amplifier 6b which powers the other speakers.

[0113] Thus, the equipment 0 comprises at least one other energy reserve capacitor also mounted on the secondary card 6 and electrically powered by the power supply module via the connection device.

[0114] This other reserve capacitor can be electrically connected to at least one of said first and / or second amplifiers 6a, 6b to provide energy to these amplifiers.

[0115] Each of the energy reserve capacitors mounted on the secondary card makes it possible to store electrical energy coming from the power supply module 41 carried by the main electronic card and, in the event of a call for electrical power by at least one of the amplifiers, to punctually supply directly available energy, in the box, at the level of the secondary card 6, as close as possible to the amplifiers and the loudspeakers.

[0116] Having one or more reserve capacitors mounted on the secondary board 6 makes it possible to shorten the electrical path between the reserve capacitor and the amplifier(s), which limits power demands at the power supply module (the power supply module 41 can thus be less heavily dimensioned); limits energy loss between the capacitor and the amplifier; improves the response time to the power demand; and limits electromagnetic interference, in particular during the transmission of the load / power to the amplifier(s).

[0117] In other words, the 6d reserve capacitors are capacitors placed as close as possible to the amplifiers to respond to high peak consumption, during current calls by the amplifiers.

[0118] These capacitors / capacitors are highly dimensioned (for example 2*2200uF instead of 2*400uF required in “stable” mode), in order to reduce the current draws on said at least one power supply module 41.

[0119] In addition to reducing the cost of the power supply module, which can be less heavily dimensioned, this has a beneficial effect on reducing electromagnetic interference (EMI).

[0120] Another effect of the proximity between capacitor(s) and amplifier(s) is the reduction of voltage drops due to resistive losses on the power supply path, therefore an improvement in audio dynamics (peak power).

[0121] The equipment 0 according to the invention mainly constitutes a “Set Top Box” (literally “set top box”) intended to receive external signals containing audio and video components, to decode these signals and to broadcast the audio component via the speakers contained in the box and the video component via display means external to the equipment.

[0122] To this end, the equipment 0 comprises a decoder placed in the housing 1, outside the box 2, mounted on the main electronic card 4 or on another electronic card remote from the main card 4, this decoder possibly being integrated into a component grouping together several functions (for example a component of the “SoC - System on Chip” type).

[0123] This decoder has: of at least one input connection 43 for receiving a signal external to the equipment comprising a video component and an audio component; and of at least one output connection 44 for broadcasting an output signal generated by the decoder as a function of said external signal, the output signal having at least one video component.

[0124] Said at least one input connection 43 is for example an optical input for receiving an optical signal, transmitted via an optical fiber and coming from an internet server and / or an Ethernet / RJ45 type input for receiving an electrical signal coming from an internet server and / or a coaxial input for receiving an electrical signal coming from a satellite receiver.

[0125] The output connection 44 of the video signal is for example an HDMI output which can be connected to an external display device such as a television or a video projector or any other type of connection suitable for broadcasting a video stream.

[0126] The decoder is connected to the audio module 42 and is arranged to: generating, as a function of said external signal received by the decoder, a decoded signal comprising at least one audio component; and to transmit the decoded signal to said audio module 42.

[0127] The audio module 42 is arranged to generate said primary audio signal as a function of the decoded signal.

[0128] It should be noted that audio decoding and the application of audio processing (audio processing functions performed by the audio module 42) can be carried out by the same electronic component (typically a DSP) or by several separate electronic components.

[0129] The audio module 42 may or may not be integrated into the main processor 4b (here an SoC).

[0130] In other words, the functions performed by the decoder and the audio module 42 can be performed on the same electronic component or distributed over several electronic components that are distinct from each other.

[0131] The input and output connectors 43, 44 of the decoder are each accessible from outside the housing 1 via connection openings made through the wall of the housing 1.

[0132] More particularly, each input or output connector 43, 44 is fixed on a rear edge of the main electronic card 4 and the connection openings are formed through the rear portion 18 of the upper cover 19 of the housing 1.

[0133] Thanks to these characteristics, the assembly of the equipment according to the invention is greatly facilitated.

[0134] In a single step of fixing the main electronic card 4 in the housing 1, the input 43 and output 44 connectors are also positioned relative to the housing 1.

[0135] In a single step of positioning the cover 19 of the housing 1 on the rest of the housing 1, we achieve: the alignment of the main board 4 relative to the cover 19 (thanks to the notched ribs 13 which limit the risk of vibrations between the board 4 and the housing 1); and the positioning of each connector 43, 44 facing the connection opening which corresponds to it (the connection openings are here made in the rear portion 19 of the cover 19).

[0136] The heat dissipation aspects will now be detailed with reference to Figures 13a5a, 5b , 6 , 7a , 7b And 8 .

[0137] Preferably, the equipment 0 comprises at least a first block of heat exchange material 91 which is: on one side in contact against a lower face of the secondary electronic card 6; and on the other side in contact against an upper face of a heat sink 10 fixed to the box 2 to evacuate heat generated at the level of the secondary electronic card 6 towards the outside of the box 2.

[0138] This heat sink 10 is here a bottom 2f of the box 2.

[0139] The upper face of this heat sink 10 comprises at least one localized boss 2f1 which is in contact against the first block of heat exchange material 91.

[0140] This boss 2f1, sometimes called a recess, allows the bottom 1f of the box 2 to be brought closer to the area of ​​the secondary electronic card 6 from which heat is to be evacuated.

[0141] A second block of heat exchange material 92 is: on one side in contact against a lower face of the first loudspeaker 3a (in this case the lower face of the permanent magnet of the loudspeaker); and on the other side in contact against the upper face of the heat sink 10 fixed to the box 2 to evacuate heat generated by the first loudspeaker 3a towards the outside of the box 2.

[0142] The heat sink 10 attached to the box 2 is arranged to dissipate heat from the inside to the outside of the box 2.

[0143] The second block of heat exchange material 92, in addition to its function of transmitting heat from the first loudspeaker 3a to the heat sink 10, also makes it possible to improve the rigidity of the assembly between the first loudspeaker 3a and the box 2.

[0144] This is useful for speaker models with a chassis, also called a "basket", that is too flexible / deformable.

[0145] The chassis / basket of the loudspeaker 3a forms an annular flange flaring from a first flange edge which is attached to a permanent magnet to a second flange edge on which a membrane of the loudspeaker 3a is attached.

[0146] It has been noted that speaker performance generally degrades from 60°C or 80°C, and sound distortions may then appear.

[0147] At higher temperatures, we can even observe a definitive degradation of the loudspeaker due to loss of magnetic characteristics of its permanent magnet.

[0148] The good cooling of the components / first speaker placed in the box 2 allows to maintain optimal audio quality, even at high sound power, while preserving the electronic components.

[0149] The lifespan of equipment 0 is thus improved.

[0150] Each block of heat exchange material 91, 92 preferably has the shape of a mat (PAD) but it can also be made of thermal paste molded at the time of assembly against the heat sink fixed to the box.

[0151] The heat sink 10 fixed to the box 2 can be constituted by the bottom 2f of the box 2 or by a plate assembled on the bottom of the box.

[0152] Depending on the amount of heat to be dissipated and the size of the heat sink 10 attached to the housing, this sink may be made of a polymer material, metal (for example aluminum or copper) or any combination of these materials.

[0153] As illustrated in the figure 6 , the bottom 2f of the box 2 preferably comprises several bosses 2f1, 2f2, 2f3 (also called recesses) each arranged to be opposite one of the blocks of heat exchange material 91, 92 which corresponds to it and which is arranged in the box 2.

[0154] Each boss 2f1, 2f2, 2f3 is formed to locally bring the bottom of the box closer to a block of heat exchange material 91, 92 which corresponds to it.

[0155] In this way the heat flow through the bottom of the box is localized and optimized at the location of the bosses.

[0156] In the embodiment illustrated by the figure 6 , the bottom 2f comprises three bosses / recesses 2f1, 2f2, 2f3, one facing a lower face of the first loudspeaker 3a and the other two facing a lower face of the secondary electronic card 6 (one at the level of the installation of the first amplifier 6a and the other at the level of the installation of the second amplifier 6b mounted on the secondary electronic card 6).

[0157] Finally, at least a third block of heat exchange material 94 is: on one side in contact against an upper face of at least one electronic component carried by the main electronic card 4 (in this case against the processor 4b); and on the other side in contact against a lower face of a main heat sink 11 extending between the main electronic card 4 and the upper cover 19 of the housing 1 to evacuate heat generated at the level of the main electronic card 4 towards the outside of the housing 1.

[0158] According to another aspect, the equipment is also equipped with microphones which are for example useful for capturing sounds in the environment of the equipment to generate a spatial sound image useful for configuring the operation of the speakers and / or for capturing commands issued by a user (the equipment being able to have voice recognition and a voice assistant function).

[0159] For this, the equipment comprises a plurality of microphones 14a, 14b, 14c, 14d arranged inside the housing and connected to the main electronic card 4 via a single microphone connector for: on the one hand electrically supply this plurality of microphones; and on the other hand transmit to a microphone module carried by the main electronic card 4 microphone signals representative of sounds picked up by the microphones.

[0160] A first pair of microphones 14a, 14b is mounted on the same first layer of electrical conductors 15 and a second pair of microphones 14c, 14d is mounted on the same second layer of electrical conductors 16.

[0161] The second layer 16 is electrically connected to said first layer 15.

[0162] The first sheet 15 extends along a first sheet axis and the second sheet extends along a second sheet axis 16 which is oriented at 90° relative to the first sheet axis.

[0163] In this way, the plurality of microphones 14a, 14b, 14, 14d is connected to the main electronic card 4 via a single microphone connection, which is particularly economical (simplification of assembly).

[0164] The microphone connection is on the underside of the main board 4 and is not visible in the figures.

[0165] Furthermore, thanks to the first and second layers 15, 16 arranged at 90° to each other, the first pair of microphones 14a, 14b is spatially positioned relative to the second pair of microphones 14c, 14d.

[0166] The spatial positioning precision of the microphones allows for precise capture of sounds emitted in the environment around the box 1.

[0167] The microphones of the first pair of microphones 14a, 14b make it possible to pick up and differentiate sounds coming from the right or left of the housing while the microphones of the second pair of microphones 14c, 14d make it possible to pick up and differentiate sounds coming from the front or rear of the housing.

[0168] In this case, as illustrated in the figure 3a , the first and second sheets 15, 16 which carry the two pairs of microphones are mounted on the main heat sink 11 (presented above) and which allows heat to be evacuated from the main electronic card 4.

[0169] In this way, the microphones are placed closer to the top cover 19 of the equipment, which improves the quality of sound capture.

[0170] Each microphone is preferably placed above the main heat exchanger 11, that is to say between the main heat exchanger 11 and the cover 1a of the housing 1.

[0171] Furthermore, to achieve sound capture, each microphone is placed facing a perforation 21 which corresponds to it and which passes through the cover 19.

[0172] Preferably, the second sheet 16 is removably connected to the first sheet 15, possibly via a connector.

[0173] Alternatively, the second sheet 16 is connected to the first sheet 15 by a fixed connection, for example by welding.

[0174] In this way, the second layer 16 and the microphones that it carries may be optional depending on whether we want a variation of the equipment 0 comprising only a first pair of microphones 14a, 14b or a variation comprising two pairs of microphones 14a, 14b, 14c, 14d.

[0175] This embodiment with two possible variations of the equipment is particularly economical to implement.

[0176] Preferably, the microphones of the first pair of microphones are spaced from each other by at least 50 mm, preferably 70 mm.

[0177] The same can be said for the microphones in the second pair of microphones.

[0178] As seen on the figures 1 And 7a, the equipment also includes an electronic communication card 12 placed in the housing 1 outside the box 2.

[0179] This communication card 12 is electrically connected to the main electronic card 4 via a secondary connection device (here a deformable ribbon cable not shown and comprising a plurality of deformable electrical conductors), so as to electrically supply at least one electronic communication element mounted on the communication card 12.

[0180] Said at least one electronic communication element belongs to the group of electronic communication elements comprising: at least one LED for diffusing light signals via at least one first optical passage formed through the wall of the housing; and / or optionally at least one infrared receiver for receiving infrared signals from a remote control of the equipment, the infrared receiver being positioned facing at least one second optical passage formed through the front part of the wall of the housing; and / or optionally at least one camera for generating images of objects located outside the housing, said at least one camera being positioned facing a third optical passage formed through the front part of the wall of the housing.

[0181] Having a separate communication card 12 remote from the main electronic card 4 makes it possible to limit the heating of said at least one electronic communication element mounted on the communication card 12.

[0182] The lifespan / aging of these electronic communication elements is thus improved because they are less impacted by the thermal releases from the main board 4 (“hot board”).

[0183] In addition, the cooling of the electronic communication card 12 (“cold card”) is improved.

[0184] Mounting the communication elements on a dedicated electronic card separate from the main electronic card also makes it easy to vary the spatial positioning / height of each of the electronic communication elements (LEDs, infrared receiver and possible camera) in relation to the front face of the box.

[0185] Indeed, as these electronic communication elements are not attached to the main electronic card 4, they can be positioned in different locations in the housing 1 without having to move or adapt the main electronic card 4.

[0186] In the embodiment illustrated in the figures 1 à 7b , it is provided that the communication card 12 is mounted in a recess 25 of the external wall of the box 2 and against an external zone of the wall of the box.

[0187] This saves space inside the housing while precisely positioning each electronic communication element carried by the communication card with respect to the front part of the housing wall which has optical passages.

[0188] In the present case, as can be understood from the cut of the figure 7a , each optical passage 17 corresponds to a single one of the electronic communication elements and integrates an optical lens forming an optical flow guide through the front wall 1b of the housing.

[0189] Preferably, the electronic communication card 12 extends in a plane perpendicular to the main plane of the main electronic card 4 and the electronic communication elements are mounted on a main flat face of the electronic communication card 12 which facilitates the positioning and assembly of these electronic elements.

[0190] As illustrated on the figures 3a , 3b , 3c , ribs 13 supported by a rear face 1c of the housing 1 extend inside the housing 1, these ribs 13 each comprising at least one notch 13a.

[0191] A rear edge of the main electronic card penetrates inside these notches so as to wedge the main electronic card by wedging its rear edge in these notches 13a.

[0192] The wedging of the rear edge of the card 4 in the notches 13a of the ribs 13 makes it possible to limit the risk of having vibrations of the main card 4 relative to the case 1, thereby limiting sound disturbances.

[0193] It is also possible for an elastically compressible foam to be arranged between the rear edge of the main electronic card and at least some of the notches 13a or the bottom of the case so as to simplify the adjustment of the main card in the ribs 13 while allowing vibrations in the foam to be dissipated.

[0194] More particularly, the rear face 1c of the housing 1 is here partly constituted by a rear portion 18 of the upper cover 19 which extends perpendicularly relative to a main flat face of the upper cover 19.

[0195] The ribs 13 supported by the rear face 1c of the housing 1 are here carried by this rear portion 18 of the cover 19.

[0196] The invention is not limited to the examples described above and it encompasses any variant falling within the scope defined by the claims.

[0197] It should be noted that certain advantages of the subwoofer exist regardless of whether or not the subwoofer contains an audio amplifier or regardless of the number of speakers it contains.

[0198] Thus, another aspect of the invention may also relate to a box comprising a lower face extending mainly in a box bottom plane and comprising: a flat portion of the front face of the box wall on which a front loudspeaker is fixed forming an angle with the bottom plane of the box, measured inside the box, which is either 90° or between 50 and 88° angle; and / or a flat portion of the right side face of the box wall on which a right loudspeaker is fixed forming an angle with the bottom plane of the box, measured inside the box, which is between 50 and 88° angle; and / or a flat portion of the left side face of the box wall on which a left loudspeaker is fixed forming an angle with the bottom plane of the box, measured inside the box, which is between 50 and 88° angle.

[0199] As explained above, this embodiment allows for upward diffusion of sounds to direct the sound to a level higher than the box where the user's head is located.

[0200] Likewise, it is preferentially ensured that each given side wall of the housing in which the box is located is parallel to a main plane defined by one of said loudspeakers carried by the box opposite this given side wall of the housing.

[0201] This embodiment is advantageous for limiting the distortion of sound diffused by the speakers through perforations made in the wall of the box.

[0202] Any other placement and / or angle of the enclosure walls described above is possible, regardless of whether or not the enclosure contains an audio amplifier or the number of speakers it contains.

Claims

1. Equipment (0) comprising a casing (1), wherein are located: - a box (2); - a first loudspeaker (3a) disposed inside the box (2) and mounted at a wall (2a) of the box (2), the first loudspeaker (3a) being arranged to broadcast sounds outwards from the casing (1); - a main electronic board (4) placed in the casing (1) outside of the box (2) and on which is mounted at least one power supply module (41) arranged to produce a first power supply voltage; - a connecting device (5) passing through the wall of the box (2a); - a secondary electronic board (6) placed inside the box (2) and on which is mounted at least one first amplifier (6a) connected to the first loudspeaker (3a), the secondary electronic board (6) being electrically connected to the main electronic board (4) via the connecting device (5), such that the first amplifier (6a) is powered by the first power supply voltage, characterised in that the connecting device (5) comprises an intermediate board (5) carrying a first plurality of electrical conductors (50) to power the first amplifier (6a) with the first power supply voltage, the intermediate board (5) and the electrical conductors (50) of said first plurality of electrical conductors passing through an opening (20) formed through the wall of the box (2) .

2. Equipment (0) according to claim 1, wherein the main electronic board (4) carries a first mechanical connector (40) and the secondary electronic board (6) carries a second mechanical connector (60), the intermediate board (5) carrying, on the one hand, a first mechanical connector (51) of the intermediate board (5) removably connected to the first mechanical connector (40) carried by the main electronic board (4) and carrying, on the other hand, a second mechanical connector (52) of the intermediate board (5) removably connected to the second mechanical connector (60) carried by the secondary electronic board (6), such that the first power supply voltage is transmitted to the first amplifier (6a) by way of the first mechanical connector (40) carried by the main electronic board (4), first and second mechanical connectors carried by the intermediate board (5) and by the second mechanical connector (60) carried by the secondary electronic board (6).

3. Equipment (0) according to claim 2, wherein: - one of said first mechanical connectors (51) is a male-type connector interlocked in the other of said first mechanical connectors (40) which is a female-type connector, these first mechanical connectors (40, 51) being connected to one another, so as to have a first clearance enabling a relative movement between these first mechanical connectors (40, 51), likewise - one of said second mechanical connectors (52) is a male-type connector interlocked in the other of said second mechanical connectors (60) which is a female-type connector, these second mechanical connectors (52, 60) being connected to one another, so as to have a second clearance enabling a relative movement between these second mechanical connectors (52, 60).

4. Equipment (0) according to any one of claims 2 or 3, wherein the intermediate board (5) extends in length and in width into a plane of the intermediate board (5), which is on the one hand, perpendicular to a main plane of the main board (4), and on the other hand, perpendicular to a front face (1b) of the casing (1).

5. Equipment (0) according to any one of claims 2 to 4, wherein the first and second mechanical connectors (51, 52) carried by the intermediate board (5) are identical to one another and the first and second mechanical connectors (40, 60) respectively carried by the main electronic board (4) and by the secondary electronic board (6) are also identical to one another.

6. Equipment (0) according to any one of claims 1 to 5, wherein the intermediate board (5) is of asymmetric form, such that the electrical connection between the main electronic board (4) and the secondary electronic board (6) via the first plurality of electrical conductors (50) carried by the intermediate board (5) is possible in one single position of the intermediate board (5) with respect to the main (4) and secondary (6) electronic boards.

7. Equipment (0) according to any one of claims 1 to 6, wherein a compressible seal (7) is disposed to oppose the air passage between the inside and the outside of the box via the opening (20) formed through the wall of the box (2).

8. Equipment (0) according to any one of claims 1 to 7, wherein an elastically deformable element (8), preferably made of foam, extends all around a longitudinal portion of the intermediate board (5), inside the opening (20) formed through the wall (2a) of the box (2), to oppose the contact between the intermediate board (5) and the wall of the box (2) .

9. Equipment (0) according to any one of claims 1 to 8, further comprising an audio module (42) placed in the casing (1) outside of the box (2) and arranged to produce a primary audio signal, the audio module (42) being connected to the secondary electronic board (6), such that when the primary audio signal is applied at the input of the first amplifier (6a) and that the first amplifier (6a) is powered by said first voltage, the first amplifier (6a) produces a first amplified audio signal sent to the first loudspeaker (3a).

10. Equipment (0) according to claim 9, wherein the audio module (42) is electrically connected to the secondary electronic board (6) by way of the connecting device (5), such that the primary audio signal is transmitted from the audio module (42) to the first amplifier (6a) by way of the connecting device (5).

11. Equipment (0) according to any one of claims 9 or 10, wherein the audio module (42) is mounted on the main electronic board (4).

12. Equipment (0) according to any one of claims 1 to 11, further comprising: - a right loudspeaker (3d) disposed in a right inner chamber (20d) of the box (2) open on a right side face (2d) of the wall of the box (2); - a left loudspeaker (3e) disposed in a left inner chamber (20e) of the box (2) open on a left side face (2e) of the wall of the box (2); and optionally - a front loudspeaker (3b) disposed in a front inner chamber (20b) of the box (2) open on a front face (2b) of the wall of the box (2); said first loudspeaker (3a) being a woofer-type loudspeaker disposed in a central inner chamber (20a) of the box (2) disposed between the right and left inner chambers (20d, 20e) of the box (2), the central inner chamber (20a) of the box being open on an upper face (2a) of the box, the right, left, front and central inner chambers (20a, 20b, 20d, 20e) of the box being sealed against one another and wherein the right loudspeaker (3d) has a main sound axis which is specific to it, and along which the sounds that it generates are mainly broadcast; - the left loudspeaker (3e) has a main sound axis which is specific to it, and along which the sounds that it generates are mainly broadcast; - the front loudspeaker (3b) has a main sound axis (Ax) which is specific to it, and along which the sounds that it generates are mainly broadcast; - the casing (1) comprising the casing bottom (1f) defining a support plane (Px) of the casing; and at least one of said main sound axes of the right, left and front loudspeakers is oriented with respect to the support plane (Px), such that the sound mainly broadcast along said at least one sound axis (Ax) moves progressively away from said support plane (Px).

13. Equipment (0) according to claim 12, wherein the main sound axis (Ax) of the front loudspeaker (3b) extends into a plane perpendicular to the support plane (Px) where it forms a front angle (A) with respect to the support plane (Px) which is of between 2 and 40° of angle, preferably of 3° of angle.

14. Equipment according to any one of claims 1 to 13, wherein the secondary board carries at least one energy reserve capacitor (6d) electrically powered by the power supply module (41) via the connecting device (5) passing through the wall (2a) of the box (2), said at least one capacitor (6d) being moreover electrically connected to said at least one first amplifier (6a), so as to supply energy to said at least one first amplifier.

15. Equipment according to any one of claims 1 to 14, wherein a plurality of microphones (14a, 14b, 14c, 14d) is disposed inside the casing and is connected to the main electronic board (4) by way of one single microphone connector to, on the one hand, electrically power this plurality of microphones and to, on the other hand, transmit to a microphone module carried by the main electronic board (4), micro signals representative of sounds captured by the microphones, a first pair of microphones (14a, 14b) being mounted on one same first layer of electrical conductors (15) and a second pair of microphones (14c, 14d) being mounted on one same second layer of electrical conductors (16), the second layer (16) being electrically connected to said first layer (15), the first layer extending along a first axis layer and the second layer extending along a second axis layer oriented at 90° with respect to the first layer axis.

16. Equipment according to claim 15, wherein the second layer (16) is removably connected to the first layer (15).