EP1187094A1 - Sound device with an acoustic waveguide - Google Patents

Sound device with an acoustic waveguide Download PDF

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Publication number
EP1187094A1
EP1187094A1 EP01402280A EP01402280A EP1187094A1 EP 1187094 A1 EP1187094 A1 EP 1187094A1 EP 01402280 A EP01402280 A EP 01402280A EP 01402280 A EP01402280 A EP 01402280A EP 1187094 A1 EP1187094 A1 EP 1187094A1
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EP
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Prior art keywords
conicoid
generator
acoustic
focal point
section
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EP01402280A
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German (de)
French (fr)
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EP1187094B1 (en
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Eric Vincenot
Francois Deffarges
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18Methods or devices for transmitting, conducting or directing sound
    • G10K11/26Sound-focusing or directing, e.g. scanning
    • G10K11/28Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Definitions

  • the invention relates to a sound device of the type comprising an acoustic waveguide and an acoustic generator coupled to this guide wave.
  • the invention relates more particularly to the shape of the waveguide forming an acoustic pavilion in order to obtain good control of the sound dispersion by means of a relatively compact assembly and in particular shallow.
  • an enclosure forming an enclosure acoustic and containing at least one acoustic generator and its guide wave is generally bulky and in particular fairly deep since the depth of said speaker essentially depends on the length of the pavilion.
  • French patent N ° 88-02481 defines the association of a generator acoustic and an acoustic waveguide. Between the entry and exit of the guide shaped obstacles are arranged to standardize the paths between the input and the output of the waveguide. The wavefront obtained is rectangular in shape and straight profile.
  • U.S. Patent No. 5,900,593 implements principles comparable to the previous one but also uses a dihedral shaped mirror curved in an arc to change the direction of sound propagation.
  • Forehead wave obtained is rectangular in shape and convex profile.
  • the primary purpose of the invention is to form an acoustic wave front of chosen shape, convex, concave or planar profile, using a waveguide reduced dimensions.
  • a second object of the invention is to propose a device arrangement sound system allowing to couple several of them so as to allow good control of the shape of the acoustic wavefront emitted by all of the acoustic generators, without creating annoying interference.
  • the invention is based on the principles of geometric acoustics, that is to say the field of acoustics based on ray theory. She applies therefore to the propagation of the sound of the known laws in optics, in particular the laws of reflection of the rays on the conicoid surfaces.
  • surface is meant conicoid a surface generated by the rotation of a curve of the family of conical. More particularly, in the context of the invention, we have found and put implementing advantageous acoustic properties, linked to reflections acoustic on surfaces such as a hyperboloid, a paraboloid or an ellipsoid.
  • the basic principle of the invention resides in the fact that, thanks to the use of such a reflecting surface as an acoustic mirror, one can move the apparent emission point of a sound source.
  • the invention relates to a sound device for the type comprising at least one acoustic generator and one waveguide acoustic provided with an input to which said generator is connected acoustics and a selected shape output from which a wave acoustic propagates outwards, characterized in that said waveguide comprises two sections of conduit, respectively a first section arranged in the extension of said outlet and a second section arranged in the extension of said entry, in that these two sections are connected in part by a curved reflecting surface having substantially the shape of a part of a conicoid and in that said entry is defined in the vicinity of a focus of said conicoid.
  • the waveguide as described can perfectly be extended by another pavilion.
  • the internal volume of said second section is substantially delimited by the intersections of a second lateral surface generated by a generator passing through a second focal point of said conicoid and based on said contour of said reflecting surface, and of said reflective surface itself, not including the common volume portion with said first section.
  • the second section includes, in the vicinity of this second hearth, an enlarged mouth connecting to said second lateral surface.
  • This mouthpiece is of shape and dimensions adapted to the associated acoustic generator.
  • the conicoid is a hyperboloid
  • this configuration facilitates the coupling of several similar devices, with emission from a front convex wave without creating interference between sources.
  • FIG. 1 there is an output 11 of selected shape of an acoustic wave guide not yet defined.
  • this outlet by which the sound must radiate to an audience, has an approximately rectangular outline but it is preferably inscribed on the surface of a sphere.
  • the output of the waveguide therefore fits preferably into a spherical convex surface.
  • the center of this sphere is denoted S 1 in FIG. 1.
  • the radius of the sphere is chosen by a person skilled in the art so that, the acoustic horn C which would extend between this center S 1 where the acoustic generator would be placed and the output 11, is long enough to ensure good control of the directivity of the projected sound beyond the output 11.
  • the theoretical shape of such a pavilion is shown in Figure 1 and it is understood that the sound system which would result the combination of such a pavilion and an acoustic generator placed at point S 1 , would be relatively bulky, particularly in depth.
  • the conicoid chosen is a hyperboloid.
  • a first focus of this hyperboloid is confused with the point S 1 (the characteristics of the hyperboloid are calculated for this).
  • the position of the second focus S 2 of the hyperboloid is also defined. This point is shown in FIG. 2.
  • This second focal point S 2 is located opposite the concave face of the reflecting surface 14 in the form of a hyperboloid.
  • the line S 1 , S 2 is the axis of revolution of this hyperboloid. From this point and from the surface 14 of the hyperboloid portion defined in the construction of FIG. 2, it is possible to define a volume represented in FIG.
  • the outlet 11 with a convex surface which is ideally inscribed on the surface of a sphere of center S 1 can in fact be relatively planar, as soon as the diameter chosen for this sphere is relatively large. Even by making this approximation, the internal volume of the conduit constituting the waveguide is determined as indicated above.
  • said second section comprises, in the vicinity of said second hearth, an enlarged mouth 24 connecting to the rest of said second lateral surface.
  • Said mouth is of shape and dimensions adapted to the acoustic generator 22 which is attached thereto.
  • FIG. 5 shows the complete sound system 25. It consists of the waveguide 26 (composed of the first and second sections 16, 18 and of the mouth 24) and of the acoustic generator 22 connected to the enlarged mouth 24.
  • the wave guide 26 is obtained by molding, or injection as soon as the walls thereof are sufficiently rigid. In theory, it is especially important that the conicoid portion is made of acoustically reflecting material, but in practice, all the walls of the waveguide are made of the same material.
  • the wave front emitted is convex.
  • the device which has just been described can be used as it is. or integrated into a box forming an acoustic enclosure.
  • the dimensions of the box, especially its depth, are shallower than what would be necessary with a horn C forming a waveguide, as shown in figure 1.
  • the rest of the box can be fitted out to house one or more additional loudspeakers.
  • the waveguide 26 has an outlet 11 comprises a substantially rectangular, with rounded corners here, associated with a curved reflecting surface 14a having substantially the shape of part of a paraboloid.
  • the limits of the reflecting surface 14 a are determined in the same way as above, considering that said first focal point is this time rejected at infinity.
  • said first lateral surface 13 a is generated by a generator perpendicular to the flat surface of said outlet 11 a and moving parallel to itself by pressing on the contour of this outlet.
  • Said second focal point in the vicinity of which the input of the waveguide will be placed and therefore the generator 22 is in fact the sole focal point of the paraboloid.
  • This second focal point, close to the generator 22 is located opposite the concave face of the reflecting surface 14 a in the form of a paraboloid.
  • the internal volume of the second section 18 a is as previously substantially delimited by the intersections of a second lateral surface 17 a generated by a generator passing through this second focal point and resting on the contour of the reflecting surface 14 a not understood, although understood, the volume portion common with said first section 16 a .
  • the reflecting surface 14 a is placed as close as possible to the outlet; we see that it "flushes" two rounded corners of it.
  • the second lateral surface 17 a has a concave face (towards the front) and a convex face (towards the rear).
  • the enlarged mouth 24 a is defined, as indicated above, at the end of said second lateral surface 17 a so as to be able to be connected to the acoustic generator 22.
  • the wave front emitted is flat.
  • the exit 11b of the waveguide 26 b are ideally placed on the surface of a sphere whose center S '1 is this time in the listening area itself.
  • the center of this theoretical sphere constitutes one of the focal points of the conicoid which defines said reflecting surface 14 b and this conicoid is an ellipsoid.
  • the construction of the volume of the waveguide is identical to what has been explained with reference to FIGS. 1 to 5.
  • the acoustic generator 22 is placed in the vicinity of the second focal point of the ellipsoid.
  • the wavefront emitted is concave and everything happens as if the sound were generated at a point S ' 1 in the listening area reserved for the audience.
  • Said first focus S ' 1 is therefore in front of the exit 11 b .
  • the waveguide and the acoustic generator can be housed inside a box forming an acoustic enclosure.
  • Figures 8 to 10 illustrate more particularly the possibilities of coupling, without interference, of several sound devices according to the invention.
  • Figure 8 illustrates the coupling of three sound devices 25 (the devices are shown in top view).
  • the overall sound system comprises several units each formed by an acoustic generator 22 and an associated waveguide 26.
  • each unit consists of a device described with reference to FIG. 5.
  • the device consists of several units each formed by an acoustic generator 22 and a waveguide 26a associated in accordance with the device which has been described with reference to FIG. 6, that is to say with a reflective surface consisting of a paraboloid part. These units are positioned side by side so that the outputs (defined in planar surfaces) are substantially aligned and therefore coplanar. In this case, all the acoustic generators positioned substantially at the focus of a reflective surface in the shape of a paraboloid, are themselves aligned.
  • the device consists of three units each formed by an acoustic generator 22 and an associated waveguide 26 b , in accordance with FIG. 7, that is to say comprising a reflecting surface forming part of an ellipsoid.
  • the three units are positioned side by side so that the first corresponding foci are substantially merged at a point S ' 1 of the listening range where the sound seems to be recreated.
  • each unit can be integrated into a shaped box so that the desired conditioning is achieved by juxtaposition of the walls side of such boxes.
  • the reflecting surface defined by a portion of conicoid tends towards a strip , or even a line defined by a portion of the corresponding conical curve, namely a hyperbola in the case of Figure 5, a parabola in the case of Figure 6 or an ellipse in the case of Figure 7.
  • a guide wave in which the reflecting surface is thus reduced to tend towards its generative curve is represented in FIG. 8 where the similar structural elements bear the same numerical references with the index c .
  • the conicoid surface is reduced to a thin strip of substantially hyperboloid reflective surface 14 c .

Abstract

The sound mechanism has an acoustic generator (22) and an acoustic guide (26) with an input connected to the acoustic generator and output (11) with a shape for propagation. The waveguide has two conduit sections (16,18) having a lengthened output section and a lengthened input section. There is a conical shaped reflection surface (14) with the input defined on the focus of the reflecting section.

Description

L'invention se rapporte à un dispositif de sonorisation du type comportant un guide d'onde acoustique et un générateur acoustique couplé à ce guide d'onde.The invention relates to a sound device of the type comprising an acoustic waveguide and an acoustic generator coupled to this guide wave.

Elle s'applique à tous les domaines de l'électroacoustique, y compris la haute fidélité.It applies to all areas of electroacoustics, including high fidelity.

L'invention concerne plus particulièrement la forme du guide d'onde formant pavillon acoustique dans le but d'obtenir une bonne maítrise de la dispersion du son au moyen d'un ensemble relativement compact et notamment peu profond.The invention relates more particularly to the shape of the waveguide forming an acoustic pavilion in order to obtain good control of the sound dispersion by means of a relatively compact assembly and in particular shallow.

En sonorisation, la bonne maítrise de la dispersion du son par un générateur acoustique impose classiquement d'utiliser un pavillon formant guide d'onde acoustique de grande taille. Par conséquent, un caisson formant enceinte acoustique et renfermant au moins un générateur acoustique et son guide d'onde est généralement volumineux et notamment assez profond puisque la profondeur de ladite enceinte acoustique dépend essentiellement de la longueur du pavillon.In sound, the good control of the dispersion of sound by a acoustic generator conventionally requires the use of a pavilion forming a guide large acoustic wave. Consequently, an enclosure forming an enclosure acoustic and containing at least one acoustic generator and its guide wave is generally bulky and in particular fairly deep since the depth of said speaker essentially depends on the length of the pavilion.

Le brevet français N° 88-02481 définit l'association d'un générateur acoustique et d'un guide d'onde acoustique. Entre l'entrée et la sortie du guide d'onde, sont agencés des obstacles conformés pour uniformiser les trajets acoustiques entre l'entrée et la sortie du guide d'onde. Le front d'onde obtenu est de forme rectangulaire et de profil droit.French patent N ° 88-02481 defines the association of a generator acoustic and an acoustic waveguide. Between the entry and exit of the guide shaped obstacles are arranged to standardize the paths between the input and the output of the waveguide. The wavefront obtained is rectangular in shape and straight profile.

Le brevet américain N° 5 900 593 met en oeuvre des principes comparables au précédent mais utilise de surcroít un miroir en forme de dièdre courbé en arc de cercle pour modifier la direction de propagation du son. Le front d'onde obtenu est de forme rectangulaire et de profil convexe.U.S. Patent No. 5,900,593 implements principles comparable to the previous one but also uses a dihedral shaped mirror curved in an arc to change the direction of sound propagation. Forehead wave obtained is rectangular in shape and convex profile.

L'invention a pour but premier de former un front d'onde acoustique de forme choisie, de profil convexe, concave ou plan, au moyen d'un guide d'onde de dimensions réduites.The primary purpose of the invention is to form an acoustic wave front of chosen shape, convex, concave or planar profile, using a waveguide reduced dimensions.

Par ailleurs, le couplage de plusieurs dispositifs de sonorisation traditionnels entraíne des irrégularités dans la dispersion du son, dues à l'apparition d'interférences acoustiques entre les ondes sonores issues des différents guides d'onde.In addition, the coupling of several sound systems traditional causes irregularities in the dispersion of sound, due to the appearance of acoustic interference between sound waves from different waveguides.

Un second but de l'invention est de proposer un agencement de dispositif de sonorisation permettant de coupler plusieurs d'entre eux de façon à permettre un bon contrôle de la forme du front d'onde acoustique émis par l'ensemble des générateurs acoustiques, sans création d'interférences gênantes.A second object of the invention is to propose a device arrangement sound system allowing to couple several of them so as to allow good control of the shape of the acoustic wavefront emitted by all of the acoustic generators, without creating annoying interference.

L'invention est fondée sur les principes de l'acoustique géométrique, c'est-à-dire le domaine de l'acoustique fondé sur la théorie des rayons. Elle applique donc à la propagation du son des lois connues en optique, en particulier les lois de réflexion des rayons sur les surfaces conicoïdes. On entend par surface conicoïde une surface engendrée par la rotation d'une courbe de la famille des coniques. Plus particulièrement, dans le cadre de l'invention, on a trouvé et mis en oeuvre des propriétés acoustiques avantageuses, liées à des réflexions acoustiques sur des surfaces telles qu'une hyperboloïde, une paraboloïde ou une ellipsoïde.The invention is based on the principles of geometric acoustics, that is to say the field of acoustics based on ray theory. She applies therefore to the propagation of the sound of the known laws in optics, in particular the laws of reflection of the rays on the conicoid surfaces. By surface is meant conicoid a surface generated by the rotation of a curve of the family of conical. More particularly, in the context of the invention, we have found and put implementing advantageous acoustic properties, linked to reflections acoustic on surfaces such as a hyperboloid, a paraboloid or an ellipsoid.

Le principe de base de l'invention réside dans le fait que, grâce à l'utilisation d'une telle surface de réflexion en tant que miroir acoustique, on peut déplacer le point d'émission apparent d'une source sonore.The basic principle of the invention resides in the fact that, thanks to the use of such a reflecting surface as an acoustic mirror, one can move the apparent emission point of a sound source.

Plus particulièrement, l'invention concerne un dispositif de sonorisation du type comprenant au moins un générateur acoustique et un guide d'onde acoustique pourvu d'une entrée à laquelle se raccorde ledit générateur acoustique et d'une sortie de forme choisie à partir de laquelle une onde acoustique se propage vers l'extérieur, caractérisé en ce que ledit guide d'onde comporte deux tronçons de conduit, respectivement un premier tronçon agencé dans le prolongement de ladite sortie et un second tronçon agencé dans le prolongement de ladite entrée, en ce que ces deux tronçons se raccordent en partie par une surface réfléchissante courbe ayant sensiblement la forme d'une partie de conicoïde et en ce que ladite entrée est définie au voisinage d'un foyer de ladite conicoïde.More particularly, the invention relates to a sound device for the type comprising at least one acoustic generator and one waveguide acoustic provided with an input to which said generator is connected acoustics and a selected shape output from which a wave acoustic propagates outwards, characterized in that said waveguide comprises two sections of conduit, respectively a first section arranged in the extension of said outlet and a second section arranged in the extension of said entry, in that these two sections are connected in part by a curved reflecting surface having substantially the shape of a part of a conicoid and in that said entry is defined in the vicinity of a focus of said conicoid.

Il est à noter que le guide d'onde tel que décrit peut parfaitement être prolongé par un autre pavillon.It should be noted that the waveguide as described can perfectly be extended by another pavilion.

Préférentiellement, le volume interne dudit premier tronçon est sensiblement délimité par les intersections :

  • de la surface de ladite sortie,
  • d'une première surface latérale engendrée par une génératrice passant par un premier foyer de ladite conicoïde et s'appuyant sur le contour de ladite sortie, et,
  • de ladite surface réfléchissante courbe délimitée à l'intérieur d'un contour défini par l'intersection de ladite conicoïde et de ladite première surface latérale.
Preferably, the internal volume of said first section is substantially delimited by the intersections:
  • of the surface of said outlet,
  • a first lateral surface generated by a generator passing through a first focal point of said conicoid and resting on the contour of said outlet, and,
  • of said curved reflecting surface delimited inside a contour defined by the intersection of said conicoid and said first lateral surface.

De la même façon, le volume interne dudit second tronçon est sensiblement délimité par les intersections d'une seconde surface latérale engendrée par une génératrice passant par un second foyer de ladite conicoïde et s'appuyant sur ledit contour de ladite surface réfléchissante, et de ladite surface réfléchissante elle-même, non compris la portion volumique commune avec ledit premier tronçon.Likewise, the internal volume of said second section is substantially delimited by the intersections of a second lateral surface generated by a generator passing through a second focal point of said conicoid and based on said contour of said reflecting surface, and of said reflective surface itself, not including the common volume portion with said first section.

Bien entendu, il est parfaitement équivalent, dans la définition desdits premier et second tronçons de considérer que le volume interne dudit second tronçon comprend ladite portion commune et que cette dernière est retranchée du volume interne dudit premier tronçon. La définition géométrique desdits premier et second tronçons du guide d'onde acoustique n'est qu'un moyen commode pour permettre d'appréhender la forme globale du volume interne du guide d'onde.Of course, it is perfectly equivalent, in the definition of said first and second sections to consider that the internal volume of said second section includes said common portion and that the latter is cut off of the internal volume of said first section. The geometric definition of said first and second sections of the acoustic waveguide is only a means convenient to understand the overall shape of the internal volume of the waveguide.

Ladite entrée est définie au voisinage dudit second foyer. Comme la source sonore ne peut être ponctuelle, le second tronçon comporte, au voisinage de ce second foyer, une embouchure élargie se raccordant à ladite seconde surface latérale. Cette embouchure est de forme et dimensions adaptées au générateur acoustique qui s'y rattache.Said entry is defined in the vicinity of said second hearth. As the sound source cannot be punctual, the second section includes, in the vicinity of this second hearth, an enlarged mouth connecting to said second lateral surface. This mouthpiece is of shape and dimensions adapted to the associated acoustic generator.

Dans le cas où la conicoïde est une hyperboloïde, tout se passe comme si le son était émis à partir dudit premier foyer, lequel se trouve à l'arrière et à distance des éléments constitutifs du dispositif. Ainsi dans ce cas, la profondeur d'un tel dispositif de sonorisation peut être notablement réduite par rapport à ce qu'elle serait si un pavillon acoustique était entièrement matérialisé entre ledit premier foyer et la sortie précitée. En outre, cette configuration facilite le couplage de plusieurs dispositifs semblables, avec une émission d'un front d'onde convexe sans création d'interférences entre les sources. In the case where the conicoid is a hyperboloid, everything happens as if sound was emitted from said first hearth, which is at the rear and distance from the components of the device. So in this case, the depth of such a sound system can be significantly reduced compared to that that it would be if an acoustic pavilion were fully materialized between said first hearth and the aforementioned exit. In addition, this configuration facilitates the coupling of several similar devices, with emission from a front convex wave without creating interference between sources.

Lorsqu'on utilise une paraboloïde, ledit premier foyer est reporté à l'infini derrière le miroir et le front d'onde acoustique est plan. Ce type d'émission est également propice à l'uniformisation de la propagation du son dans un local et à un bon couplage sans interférence entre plusieurs sources.When using a dish, said first focus is carried over to infinity behind the mirror and the acoustic wavefront is flat. This type of program is also conducive to standardizing the propagation of sound in a room and good coupling without interference between several sources.

Enfin, si le miroir est une portion d'ellipsoïde, ledit premier foyer est reporté en avant de l'ouverture de sorte que le son semble recréé en un point donné du lieu d'écoute. Le front d'onde est concave. Plusieurs dispositifs semblables peuvent également être couplés sans interférence en renforçant l'effet d'une source sonore virtuelle sur le lieu d'écoute.Finally, if the mirror is a portion of ellipsoid, said first focus is carried forward of the opening so that the sound seems recreated at a point given listening place. The wave front is concave. Several devices alike can also be coupled without interference by strengthening the effect of a virtual sound source on the listening location.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaítront plus clairement à la lumière de la description qui va suivre de plusieurs modes de réalisation d'un dispositif de sonorisation conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • les figures 1 à 4 sont des schémas illustrant les étapes de la conception d'un guide d'onde conforme à l'invention ;
  • la figure 5 illustre le dispositif de sonorisation équipé d'un premier type de guide d'onde conforme à l'invention ;
  • la figure 6 est une vue analogue à la figure 5 illustrant un dispositif de sonorisation équipé d'un deuxième type de guide d'onde, conforme à l'invention ;
  • la figure 7 est une vue analogue à la figure 5 illustrant un dispositif de sonorisation équipé d'un troisième type de guide d'onde conforme à l'invention ;
  • la figure 8 illustre une variante de la figure 5 ;
  • la figure 9 illustre schématiquement le couplage sans interférence de plusieurs dispositifs de sonorisation du type décrit à la figure 5 ;
  • la figure 10 illustre schématiquement le couplage de plusieurs dispositifs de sonorisation du type décrit à la figure 6 ; et
  • la figure 11 illustre schématiquement le couplage de plusieurs dispositifs de sonorisation du type décrit à la figure 7.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of several embodiments of a sound device in accordance with its principle, given solely by way of example and made with reference to the accompanying drawings in which:
  • Figures 1 to 4 are diagrams illustrating the stages of the design of a waveguide according to the invention;
  • FIG. 5 illustrates the sound device equipped with a first type of waveguide according to the invention;
  • Figure 6 is a view similar to Figure 5 illustrating a sound device equipped with a second type of waveguide, according to the invention;
  • Figure 7 is a view similar to Figure 5 illustrating a sound device equipped with a third type of waveguide according to the invention;
  • Figure 8 illustrates a variant of Figure 5;
  • FIG. 9 schematically illustrates the coupling without interference of several public address devices of the type described in FIG. 5;
  • FIG. 10 schematically illustrates the coupling of several public address devices of the type described in FIG. 6; and
  • FIG. 11 schematically illustrates the coupling of several public address devices of the type described in FIG. 7.

Sur la figure 1 on distingue une sortie 11 de forme choisie d'un guide d'onde acoustique encore non défini. Dans l'exemple, cette sortie, par laquelle le son doit rayonner jusqu'à un auditoire, a un contour approximativement rectangulaire mais il s'inscrit de préférence à la surface d'une sphère. La sortie du guide d'onde s'inscrit donc de preterence dans une surface sphenque convexe. Le centre de cette sphère est noté S1 sur la figure 1. Le rayon de la sphère est choisi par l'homme du métier pour que, le pavillon acoustique C qui s'étendrait entre ce centre S1 où on placerait le générateur acoustique et la sortie 11, soit suffisamment long pour assurer une bonne maítrise de la directivité du son projeté au-delà de la sortie 11. La forme théorique d'un tel pavillon est représentée sur la figure 1 et on comprend que le dispositif de sonorisation qui résulterait de la combinaison d'un tel pavillon et d'un générateur acoustique placé au point S1, serait relativement encombrant, notamment en profondeur.In Figure 1 there is an output 11 of selected shape of an acoustic wave guide not yet defined. In the example, this outlet, by which the sound must radiate to an audience, has an approximately rectangular outline but it is preferably inscribed on the surface of a sphere. The output of the waveguide therefore fits preferably into a spherical convex surface. The center of this sphere is denoted S 1 in FIG. 1. The radius of the sphere is chosen by a person skilled in the art so that, the acoustic horn C which would extend between this center S 1 where the acoustic generator would be placed and the output 11, is long enough to ensure good control of the directivity of the projected sound beyond the output 11. The theoretical shape of such a pavilion is shown in Figure 1 and it is understood that the sound system which would result the combination of such a pavilion and an acoustic generator placed at point S 1 , would be relatively bulky, particularly in depth.

C'est pourquoi on choisit de "tronquer" ce volume en interposant une surface réfléchissante courbe ayant sensiblement la forme d'une partie de conicoïde, entre la sortie 11 et le point S1. De plus, cette conicoïde est choisie pour que l'un de ses foyers soit placé au point S1. On parlera, dans la suite du texte, du foyer S1 sans oublier que ce foyer est aussi le centre d'une sphère fictive telle que définie plus haut. Dès lors, on a défini une partie du conduit réel constituant le guide d'onde et plus particulièrement un premier tronçon 16, agencé dans le prolongement de ladite sortie 11 et dont le volume interne est sensiblement délimité par les intersections :

  • de la surface de la sortie 11,
  • d'une première surface latérale 13 engendrée par une génératrice rectiligne passant par le premier foyer de la conicoïde et s'appuyant sur le contour de la sortie 11. Il est clair que cette première surface latérale 13 se confond avec celle du pavillon théorique C défini plus haut.
  • de la surface réfléchissante courbe 14 elle-même, portion de conicoïde, délimitée à l'intérieur d'un contour défini par l'intersection de cette conicoïde et de ladite première surface latérale 13.
This is why one chooses to "truncate" this volume by interposing a curved reflecting surface having substantially the shape of a conicoid part, between the outlet 11 and the point S 1 . In addition, this conicoid is chosen so that one of its foci is placed at point S 1 . We will speak, in the following text, of the focal point S 1 without forgetting that this focal point is also the center of a fictitious sphere as defined above. Consequently, a part of the actual duct constituting the waveguide has been defined, and more particularly a first section 16, arranged in the extension of said outlet 11 and whose internal volume is substantially delimited by the intersections:
  • from the surface of exit 11,
  • of a first lateral surface 13 generated by a rectilinear generator passing through the first focal point of the conicoid and resting on the contour of the outlet 11. It is clear that this first lateral surface 13 merges with that of the theoretical pavilion C defined upper.
  • of the curved reflecting surface 14 itself, portion of a conicoid, delimited inside a contour defined by the intersection of this conicoid and said first lateral surface 13.

Dans l'exemple de la figure 1, la conicoïde choisie est une hyperboloïde. Comme indiqué précédemment, un premier foyer de cette hyperboloïde est confondu avec le point S1 (les caractéristiques de l'hyperboloïde sont calculées pour cela). Selon la position du premier foyer et les caractéristiques de l'hyperboloïde, la position du second foyer S2 de l'hyperboloïde se trouve aussi définie. Ce point est représenté sur la figure 2. Ce second foyer S2 se situe en regard de la face concave de la surface réfléchissante 14 en forme d'hyperboloïde. La droite S1, S2 est l'axe de révolution de cette hyperboloïde. A partir de ce point et à partir de la surface 14 de la portion d'hyperboloïde définie dans la construction de la figure 2, il est possible de définir un volume représenté sur la figure 3 qui est sensiblement délimité par les intersections de la surface réfléchissante 14 et d'une seconde surface latérale 17 engendrée par une génératrice rectiligne passant par le second foyer S2 de la conicoïde (hyperboloïde) et s'appuyant sur le contour de la surface réfléchissante 14 préalablement délimitée. Si on retranche à ce volume, sa portion volumique commune avec ledit premier tronçon de conduit 16 défini plus haut, on a défini le second tronçon de conduit 18 du guide d'onde, lequel est globalement agencé dans le prolongement de l'entrée du guide d'onde, définie au voisinage du second foyer S2. Le volume interne et la forme du guide d'onde se trouvent donc théoriquement déterminés par la réunion desdits premier et second tronçons 16 et 18. C'est la représentation globale qui en est donnée sur la figure 4. En théorie, si un générateur acoustique est placé au point S2 (c'est-à-dire le second foyer précité de la surface réfléchissante courbe 14 appartenant à une hyperboloïde), tout se passe comme si le son était émis du point S1, avec un pavillon acoustique C (voir figure 1).In the example in Figure 1, the conicoid chosen is a hyperboloid. As indicated previously, a first focus of this hyperboloid is confused with the point S 1 (the characteristics of the hyperboloid are calculated for this). According to the position of the first focus and the characteristics of the hyperboloid, the position of the second focus S 2 of the hyperboloid is also defined. This point is shown in FIG. 2. This second focal point S 2 is located opposite the concave face of the reflecting surface 14 in the form of a hyperboloid. The line S 1 , S 2 is the axis of revolution of this hyperboloid. From this point and from the surface 14 of the hyperboloid portion defined in the construction of FIG. 2, it is possible to define a volume represented in FIG. 3 which is substantially delimited by the intersections of the reflecting surface 14 and a second lateral surface 17 generated by a rectilinear generator passing through the second focal point S 2 of the conicoid (hyperboloid) and resting on the contour of the reflecting surface 14 previously delimited. If we subtract from this volume, its volume portion common with said first section of conduit 16 defined above, we have defined the second section of conduit 18 of the waveguide, which is generally arranged in the extension of the inlet of the guide wave, defined in the vicinity of the second focal point S 2 . The internal volume and the shape of the waveguide are therefore theoretically determined by the meeting of said first and second sections 16 and 18. This is the global representation which is given in FIG. 4. In theory, if an acoustic generator is placed at point S 2 (that is to say the aforementioned second focal point of the curved reflecting surface 14 belonging to a hyperboloid), everything happens as if the sound were emitted from point S 1 , with an acoustic horn C ( see figure 1).

Il est à noter qu'il est avantageux de placer la conicoïde de façon que cette surface 14 soit relativement proche de la surface dans laquelle se dessine la sortie 11. Dans ces conditions ledit premier tronçon 16 peut être aussi court que possible.It should be noted that it is advantageous to place the conicoid so that this surface 14 is relatively close to the surface in which takes shape the exit 11. Under these conditions said first section 16 can be as short as possible.

Selon une version simplifiée, la sortie 11 à surface convexe qui est idéalement inscrite à la surface d'une sphère de centre S1 peut être en fait relativement plane, dès lors que le diamètre choisi de cette sphère est relativement grand. Même en faisant cette approximation, le volume interne du conduit constituant le guide d'onde est déterminé comme indiqué plus haut.According to a simplified version, the outlet 11 with a convex surface which is ideally inscribed on the surface of a sphere of center S 1 can in fact be relatively planar, as soon as the diameter chosen for this sphere is relatively large. Even by making this approximation, the internal volume of the conduit constituting the waveguide is determined as indicated above.

Néanmoins, il convient d'adapter l'extrémité de ladite seconde surface latérale 17 au voisinage dudit second foyer S2, pour tenir compte des caractéristiques dimensionnelles du générateur acoustique. C'est pourquoi cette partie de ladite seconde surface latérale 17 est modifiée pour permettre l'adaptation d'un tel générateur acoustique 22. A cet effet, ledit second tronçon comporte, au voisinage dudit second foyer, une embouchure élargie 24 se raccordant au reste de ladite seconde surface latérale. Ladite embouchure est de forme et dimensions adaptées au générateur acoustique 22 qui s'y rattache. La figure 5 montre le dispositif de sonorisation 25 complet. Il se compose du guide d'onde 26 (composé des premier et second tronçons 16, 18 et de l'embouchure 24) et du générateur acoustique 22 raccordé à l'embouchure élargie 24. Le guide d'onde 26 est obtenu par moulage, ou injection dès lors que les parois de celui-ci sont suffisamment rigides. En théorie, il est surtout important que la portion de conicoïde soit en matériau réfléchissant du point de vue acoustique mais dans la pratique, toutes les parois du guide d'onde sont réalisées dans le même matériau. Le front d'onde émis est convexe.Nevertheless, it is advisable to adapt the end of said second lateral surface 17 in the vicinity of said second focal point S 2 , to take account of the dimensional characteristics of the acoustic generator. This is why this part of said second lateral surface 17 is modified to allow the adaptation of such an acoustic generator 22. For this purpose, said second section comprises, in the vicinity of said second hearth, an enlarged mouth 24 connecting to the rest of said second lateral surface. Said mouth is of shape and dimensions adapted to the acoustic generator 22 which is attached thereto. FIG. 5 shows the complete sound system 25. It consists of the waveguide 26 (composed of the first and second sections 16, 18 and of the mouth 24) and of the acoustic generator 22 connected to the enlarged mouth 24. The wave guide 26 is obtained by molding, or injection as soon as the walls thereof are sufficiently rigid. In theory, it is especially important that the conicoid portion is made of acoustically reflecting material, but in practice, all the walls of the waveguide are made of the same material. The wave front emitted is convex.

Dans la pratique, le dispositif qui vient d'être décrit peut être utilisé tel quel ou intégré à un caisson formant enceinte acoustique. Dans ce cas, il ressort clairement de la comparaison des figures 1 et 5, que les dimensions du caisson, notamment sa profondeur, sont plus faibles que ce qui serait nécessaire avec un pavillon C formant guide d'onde, conforme à la figure 1. Le reste du caisson peut être aménagé pour abriter un ou plusieurs haut-parleurs complémentaires.In practice, the device which has just been described can be used as it is. or integrated into a box forming an acoustic enclosure. In this case, it appears clearly from the comparison of FIGS. 1 and 5, that the dimensions of the box, especially its depth, are shallower than what would be necessary with a horn C forming a waveguide, as shown in figure 1. The rest of the box can be fitted out to house one or more additional loudspeakers.

Dans le dispositif de la figure 6, le guide d'onde 26a comporte une sortie 11a approximativement rectangulaire, ici à coins arrondis, associé à une surface réfléchissante courbe 14a ayant sensiblement la forme d'une partie de paraboloïde. Les limites de la surface réfléchissante 14a sont déterminées de la même façon que précédemment en considérant que ledit premier foyer est cette fois rejeté à l'infini.In the device of Figure 6, the waveguide 26 has an outlet 11 comprises a substantially rectangular, with rounded corners here, associated with a curved reflecting surface 14a having substantially the shape of part of a paraboloid. The limits of the reflecting surface 14 a are determined in the same way as above, considering that said first focal point is this time rejected at infinity.

Par conséquent, ladite première surface latérale 13a est engendrée par une génératrice perpendiculaire à la surface plane de ladite sortie 11a et se déplaçant parallèlement à elle-même en s'appuyant sur le contour de cette sortie. Ledit second foyer au voisinage duquel on va placer l'entrée du guide d'onde et donc le générateur 22 est en fait le foyer unique de la paraboloïde. Ce second foyer, proche du générateur 22 se situe en regard de la face concave de la surface réfléchissante 14a en forme de paraboloïde. Le volume interne du second tronçon 18a est comme précédemment sensiblement délimité par les intersections d'une seconde surface latérale 17a engendrée par une génératrice passant par ce second foyer et s'appuyant sur le contour de la surface réfléchissante 14a non compris, bien entendu, la portion volumique commune avec ledit premier tronçon 16a.Consequently, said first lateral surface 13 a is generated by a generator perpendicular to the flat surface of said outlet 11 a and moving parallel to itself by pressing on the contour of this outlet. Said second focal point in the vicinity of which the input of the waveguide will be placed and therefore the generator 22 is in fact the sole focal point of the paraboloid. This second focal point, close to the generator 22 is located opposite the concave face of the reflecting surface 14 a in the form of a paraboloid. The internal volume of the second section 18 a is as previously substantially delimited by the intersections of a second lateral surface 17 a generated by a generator passing through this second focal point and resting on the contour of the reflecting surface 14 a not understood, although understood, the volume portion common with said first section 16 a .

Comme dans le cas précédent, la surface réfléchissante 14a est placée aussi près que possible de la sortie ; on voit qu'elle "affleure" deux coins arrondis de celle-ci. La seconde surface latérale 17a présente une face concave (vers l'avant) et une face convexe (vers l'arrière).As in the previous case, the reflecting surface 14 a is placed as close as possible to the outlet; we see that it "flushes" two rounded corners of it. The second lateral surface 17 a has a concave face (towards the front) and a convex face (towards the rear).

L'embouchure élargie 24a est définie, comme indiqué précédemment, à l'extrémité de ladite seconde surface latérale 17a pour pouvoir se raccorder au générateur acoustique 22. Le front d'onde émis est plan.The enlarged mouth 24 a is defined, as indicated above, at the end of said second lateral surface 17 a so as to be able to be connected to the acoustic generator 22. The wave front emitted is flat.

Dans le mode de réalisation de la figure 7, les éléments de structure semblables à ceux du mode de réalisation de la figure 5, portent les mêmes références numériques avec l'indice b. Il ne seront pas décrits à nouveau en détail.In the embodiment of Figure 7, the structural elements similar to those of the embodiment of Figure 5, have the same reference numerals with the index b . They will not be described again in detail.

Dans cet exemple, la sortie 11b du guide d'onde 26b s'inscrit idéalement à la surface d'une sphère dont le centre S'1 se trouve, cette fois, dans la zone d'écoute elle-même. Dans ce cas, le centre de cette sphère théorique constitue l'un des foyers de la conicoïde qui définit ladite surface réfléchissante 14b et cette conicoïde est une ellipsoïde.In this example, the exit 11b of the waveguide 26 b are ideally placed on the surface of a sphere whose center S '1 is this time in the listening area itself. In this case, the center of this theoretical sphere constitutes one of the focal points of the conicoid which defines said reflecting surface 14 b and this conicoid is an ellipsoid.

Bien entendu, comme dans le cas de la figure 5, on peut concevoir une sortie pratiquement plane si le rayon de la sphère est choisi suffisamment grand. Pour le reste, la construction du volume du guide d'onde est identique à ce qui a été expliqué en référence aux figures 1 à 5. Le générateur acoustique 22 est placé au voisinage du second foyer de l'ellipsoïde. Le front d'onde émis est concave et tout se passe comme si le son était généré en un point S'1 de la zone d'écoute réservée à l'auditoire. Ledit premier foyer S'1 se trouve donc en avant de la sortie 11b. Comme précédemment, le guide d'onde et le générateur acoustique peuvent être logés à l'intérieur d'un caisson formant enceinte acoustique.Of course, as in the case of FIG. 5, it is possible to design a practically flat outlet if the radius of the sphere is chosen to be sufficiently large. For the rest, the construction of the volume of the waveguide is identical to what has been explained with reference to FIGS. 1 to 5. The acoustic generator 22 is placed in the vicinity of the second focal point of the ellipsoid. The wavefront emitted is concave and everything happens as if the sound were generated at a point S ' 1 in the listening area reserved for the audience. Said first focus S ' 1 is therefore in front of the exit 11 b . As before, the waveguide and the acoustic generator can be housed inside a box forming an acoustic enclosure.

Les figures 8 à 10 illustrent plus particulièrement les possibilités de couplage, sans interférence, de plusieurs dispositifs de sonorisation conformes à l'invention. Ainsi, la figure 8 illustre le couplage de trois dispositifs de sonorisation 25 (les dispositifs sont représentés en vue de dessus). Autrement dit, le dispositif de sonorisation global comporte plusieurs unités formées chacune d'un générateur acoustique 22 et d'un guide d'onde 26 associé. Dans l'exemple de la figure 8, chaque unité est constituée d'un dispositif décrit en référence à la figure 5. Pour que de telles unités puissent être associées sans provoquer d'interférences, il suffit qu'elles soient positionnées les unes par rapport aux autres de façon que les premiers foyers correspondants S1 soient sensiblement confondus. C'est ce qui est illustré sur la figure 8. Dans ce cas, toutes les unités semblent émettre du même point S1 situé à l'arrière de celles-ci.Figures 8 to 10 illustrate more particularly the possibilities of coupling, without interference, of several sound devices according to the invention. Thus, Figure 8 illustrates the coupling of three sound devices 25 (the devices are shown in top view). In other words, the overall sound system comprises several units each formed by an acoustic generator 22 and an associated waveguide 26. In the example of FIG. 8, each unit consists of a device described with reference to FIG. 5. In order for such units to be able to be combined without causing interference, it suffices that they are positioned in relation to one another. to the others so that the first corresponding homes S 1 are substantially combined. This is what is illustrated in FIG. 8. In this case, all the units seem to emit from the same point S 1 situated at the rear of these.

Dans l'exemple de la figure 9, le dispositif est constitué de plusieurs unités formées chacune d'un générateur acoustique 22 et d'un guide d'onde 26a associé conformes au dispositif qui a été décrit en référence à la figure 6, c'est-à-dire avec une surface réfléchissante constituée par une partie de paraboloïde. Ces unités sont positionnées côte à côte de façon que les sorties (définies dans des surfaces planes) soient sensiblement alignées et donc coplanaires. Dans ce cas, tous les générateurs acoustiques positionnés sensiblement au foyer d'une surface réfléchissante en forme de paraboloïde, sont eux-mêmes alignés.In the example of Figure 9, the device consists of several units each formed by an acoustic generator 22 and a waveguide 26a associated in accordance with the device which has been described with reference to FIG. 6, that is to say with a reflective surface consisting of a paraboloid part. These units are positioned side by side so that the outputs (defined in planar surfaces) are substantially aligned and therefore coplanar. In this case, all the acoustic generators positioned substantially at the focus of a reflective surface in the shape of a paraboloid, are themselves aligned.

Dans le mode de réalisation de la figure 10, le dispositif est constitué de trois unités formées chacune d'un générateur acoustique 22 et d'un guide d'onde 26b associé, conforme à la figure 7, c'est-à-dire comprenant une surface réfléchissante s'inscrivant dans une ellipsoïde. Les trois unités sont positionnées côte à côte de façon que les premiers foyers correspondants soient sensiblement confondus en un point S'1 du domaine d'écoute où le son semble recréé.In the embodiment of FIG. 10, the device consists of three units each formed by an acoustic generator 22 and an associated waveguide 26 b , in accordance with FIG. 7, that is to say comprising a reflecting surface forming part of an ellipsoid. The three units are positioned side by side so that the first corresponding foci are substantially merged at a point S ' 1 of the listening range where the sound seems to be recreated.

Bien entendu, chaque unité peut être intégrée dans un caisson conformé pour que le conditionnement recherché soit atteint par juxtaposition des parois latérales de tels caissons.Of course, each unit can be integrated into a shaped box so that the desired conditioning is achieved by juxtaposition of the walls side of such boxes.

De plus, dans chacun des cas illustrés en référence aux figures 5 à 7, lorsque la plus petite dimension de la sortie devient faible en regard des longueurs d'onde des sons produits, la surface réfléchissante définie par une portion de conicoïde tend vers une bande, voire une ligne définie par une portion de la courbe conique correspondante, à savoir une hyperbole dans le cas de la figure 5, une parabole dans le cas de la figure 6 ou une ellipse dans le cas de la figure 7. Un guide d'onde dans lequel la surface réfléchissante est ainsi réduite pour tendre vers sa courbe génératrice est représenté à la figure 8 où les éléments de structure analogues portent les mêmes références numériques avec l'indice c. Sur cette figure, la surface de conicoïde est réduite à une fine bande de surface réfléchissante 14c sensiblement hyperboloïde.In addition, in each of the cases illustrated with reference to FIGS. 5 to 7, when the smallest dimension of the output becomes small compared with the wavelengths of the sounds produced, the reflecting surface defined by a portion of conicoid tends towards a strip , or even a line defined by a portion of the corresponding conical curve, namely a hyperbola in the case of Figure 5, a parabola in the case of Figure 6 or an ellipse in the case of Figure 7. A guide wave in which the reflecting surface is thus reduced to tend towards its generative curve is represented in FIG. 8 where the similar structural elements bear the same numerical references with the index c . In this figure, the conicoid surface is reduced to a thin strip of substantially hyperboloid reflective surface 14 c .

Claims (11)

Dispositif de sonorisation du type comprenant au moins un générateur acoustique (22) et un guide d'onde acoustique (26) pourvu d'une entrée à laquelle se raccorde ledit générateur acoustique et d'une sortie (11) de forme choisie à partir de laquelle une onde acoustique se propage vers l'extérieur, caractérisé en ce que ledit guide d'onde comporte deux tronçons de conduit (16, 18), respectivement un premier tronçon (16) agencé dans le prolongement de ladite sortie et un second tronçon (18) agencé dans le prolongement de ladite entrée, en ce que ces deux tronçons se raccordent en partie par une surface réfléchissante courbe (14) ayant sensiblement la forme d'une partie de conicoïde et en ce que ladite entrée est définie au voisinage d'un foyer (S2) de ladite conicoïde.Sound system of the type comprising at least one acoustic generator (22) and an acoustic waveguide (26) provided with an input to which said acoustic generator is connected and with an output (11) of a shape chosen from which an acoustic wave propagates outwards, characterized in that said waveguide comprises two sections of conduit (16, 18), respectively a first section (16) arranged in the extension of said outlet and a second section ( 18) arranged in the extension of said entry, in that these two sections are partly connected by a curved reflecting surface (14) having substantially the shape of a conicoid part and in that said entry is defined in the vicinity of a focal point (S 2 ) of said conicoid. Dispositif selon la revendication 1, caractérisé en ce que le volume interne dudit premier tronçon (16) est sensiblement délimité par les intersections : de la surface de ladite sortie (11), d'une première surface latérale (13) engendrée par une génératrice passant par un premier foyer (S1) de ladite conicoïde et s'appuyant sur le contour de ladite sortie, et, de ladite surface réfléchissante courbe (14) délimitée à l'intérieur d'un contour défini par l'intersection de ladite conicoïde et de ladite première surface latérale. Device according to claim 1, characterized in that the internal volume of said first section (16) is substantially delimited by the intersections: of the surface of said outlet (11), a first lateral surface (13) generated by a generator passing through a first focal point (S 1 ) of said conicoid and resting on the contour of said outlet, and, of said curved reflecting surface (14) delimited inside a contour defined by the intersection of said conicoid and said first lateral surface. Dispositif selon la revendication 2, caractérisé en ce que le volume interne dudit second tronçon (18) est sensiblement délimité par les intersections d'une seconde surface latérale (17) engendrée par une génératrice passant par un second foyer (S2) de ladite conicoïde et s'appuyant sur ledit contour de ladite surface réfléchissante, et de ladite surface réfléchissante (14) elle-même, non compris la portion volumique commune avec ledit premier tronçon.Device according to claim 2, characterized in that the internal volume of said second section (18) is substantially delimited by the intersections of a second lateral surface (17) generated by a generator passing through a second focus (S 2 ) of said conicoid and resting on said contour of said reflecting surface, and of said reflecting surface (14) itself, not including the volume portion common with said first section. Dispositif selon la revendication 3, caractérisé en ce que ledit second tronçon (18) comporte, au voisinage dudit second foyer, une embouchure élargie (24) se raccordant à ladite seconde surface latérale, ladite embouchure étant de forme et dimensions adaptées audit générateur acoustique qui s'y rattache. Device according to claim 3, characterized in that said second section (18) comprises, in the vicinity of said second focal point, an enlarged mouth (24) connecting to said second lateral surface, said mouth being of shape and dimensions adapted to said acoustic generator which is attached to it. Dispositif selon l'une des revendications précédentes, caractérisé en ce que ladite conicoïde est une hyperboloïde, ledit second foyer (S2) proche dudit générateur se situant en regard de la face concave de celle-ci.Device according to one of the preceding claims, characterized in that the said conicoid is a hyperboloid, the said second focal point (S 2 ) close to the said generator being located opposite the concave face thereof. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que ladite conicoïde est une ellipsoïde, ledit premier foyer (S'1) se trouvant en avant de ladite sortie (11b).Device according to one of claims 1 to 4, characterized in that said conicoid is an ellipsoid, said first focal point (S ' 1 ) being in front of said outlet (11 b ). Dispositif selon la revendication 5 ou 6, caractérisé en ce que le contour de ladite sortie (11, 11b) s'inscrit sensiblement à la surface d'une sphère dont le centre est confondu avec ledit premier foyer.Device according to claim 5 or 6, characterized in that the contour of said outlet (11, 11 b ) is inscribed substantially on the surface of a sphere whose center coincides with said first focus. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que ladite conicoïde est une paraboloïde, ledit premier foyer étant rejeté à l'infini et ledit second foyer, proche dudit générateur, se situant en regard de la face concave de ladite surface réfléchissante (14a).Device according to one of Claims 1 to 5, characterized in that the said conicoid is a paraboloid, the said first focal point being rejected endlessly and the said second focal point, close to the said generator, lying opposite the concave face of the said surface reflecting (14 a). Dispositif selon l'une des revendications 5 à 7, caractérisé en ce qu'il comporte plusieurs unités formées chacune d'un générateur acoustique (20) et d'un guide d'onde associé et en ce que ces unités sont positionnées les unes par rapport aux autres de façon que les premiers foyers (S1, S'1) correspondants soient sensiblement confondus.Device according to one of claims 5 to 7, characterized in that it comprises several units each formed by an acoustic generator (20) and an associated waveguide and in that these units are positioned one by relative to the others so that the first corresponding foci (S 1 , S ′ 1 ) are substantially confused. Dispositif selon la revendication 8, caractérisé en ce qu'il comporte plusieurs unités formées chacune d'un générateur acoustique et d'un guide d'onde associé et en ce que ces unités sont positionnées de façon que lesdites sorties (11a) soient sensiblement alignées.Device according to Claim 8, characterized in that it comprises a plurality of units each formed of an acoustical generator and an associated waveguide and in that said units are positioned so that said exits (11a) are substantially aligned. Dispositif selon la revendication 9 ou 10, caractérisé en ce que chaque unité est intégrée à un caisson conformé pour que le positionnement recherché des unités soit atteint par juxtaposition des parois latérales des caissons.Device according to claim 9 or 10, characterized in that each unit is integrated into a box shaped so that the desired positioning of the units is achieved by juxtaposition of the side walls of the boxes.
EP01402280A 2000-09-08 2001-09-03 Sound device with an acoustic waveguide Expired - Lifetime EP1187094B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0011496A FR2813986B1 (en) 2000-09-08 2000-09-08 SOUND WAVE GUIDE DEVICE
FR0011496 2000-09-08

Publications (2)

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EP1187094A1 true EP1187094A1 (en) 2002-03-13
EP1187094B1 EP1187094B1 (en) 2004-11-24

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EP01402280A Expired - Lifetime EP1187094B1 (en) 2000-09-08 2001-09-03 Sound device with an acoustic waveguide

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US (1) US6585077B2 (en)
EP (1) EP1187094B1 (en)
JP (1) JP4897161B2 (en)
DE (1) DE60107336T2 (en)
FR (1) FR2813986B1 (en)

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FR2994046A1 (en) * 2012-07-27 2014-01-31 Jean Noel Duchamp Sound system for use at output of loudspeaker, has reflective wall and two flanges extending from input to output from which wave produced by loudspeaker or compression chamber leaves so as to undergo functions such as wave guiding

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EP2922050A1 (en) 2014-03-10 2015-09-23 Ciare s.r.l. Acoustic wave guide
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Also Published As

Publication number Publication date
US6585077B2 (en) 2003-07-01
US20020029926A1 (en) 2002-03-14
FR2813986B1 (en) 2002-11-29
FR2813986A1 (en) 2002-03-15
DE60107336T2 (en) 2005-12-01
JP4897161B2 (en) 2012-03-14
DE60107336D1 (en) 2004-12-30
JP2002135878A (en) 2002-05-10
EP1187094B1 (en) 2004-11-24

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