EP0331566A1 - Cylindrical acoustic wave guide - Google Patents

Cylindrical acoustic wave guide Download PDF

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Publication number
EP0331566A1
EP0331566A1 EP19890400530 EP89400530A EP0331566A1 EP 0331566 A1 EP0331566 A1 EP 0331566A1 EP 19890400530 EP19890400530 EP 19890400530 EP 89400530 A EP89400530 A EP 89400530A EP 0331566 A1 EP0331566 A1 EP 0331566A1
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EP
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Prior art keywords
conduit
waveguide
outlet
orifice
passage
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EP19890400530
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German (de)
French (fr)
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EP0331566B1 (en
Inventor
Christian Heil
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L Acoustics SAS
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Heil Acoustics
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements 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
    • H04R1/345—Arrangements 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 present invention relates to the optimization of acoustic couplings between neighboring electroacoustic transducers, over the whole extent of their frequency spectrum, by means of a particular waveguide.
  • the purpose of this waveguide is to transform an isophase circular planar wave surface (loudspeaker membrane or outlet of a compression chamber) into an isophase rectangular planar wave surface.
  • the alignment of several rectangular surfaces thus formed constitutes an isophase flat ribbon from which a coherent cylindrical progressive wave can emerge.
  • several transducers thus coupled generate a coherent cylindrical wave while these same transducers without the waveguide of the invention generate as many spherical traveling waves interfering with each other.
  • the sound waveguide has a circular input and a rectangular output so that the propagation time of the wave between input and output is constant, whatever the acoustic path taken.
  • the waveguide adapts in front of a loudspeaker or in front of the orifice of a compression chamber along the axis of the transducer considered, and comprises a conduit widening from the inlet to an outlet area characterized by the fact that the area of the outlet opening of the waveguide is flat and oblong, that its duct has a passage (between the inlet opening and the outlet area) evoking the general shape of 'a sheet, that the shortest paths allowed in the sheet-like passage (s) are all of practically equal length to go from the inlet orifice to the outlet orifice of the conduit.
  • the so-called sheet form is obtained by deformation of the walls of the conduit or by incorporation of one or more bodies internal to the conduit, or both by deformation of the walls of the conduit and by incorporation of one or more bodies internal to said conduit.
  • the internal body can have various shapes and be made up of several elements.
  • This body may have the general appearance of a flattened pyramid, or of a flattened cone, the point of which penetrates into the entry orifice, and the other end of which is bevelled so that its edge is flush with the outlet area of the conduit along the axis of said outlet.
  • the diffuser is designed to work with several speakers and several waveguides.
  • the oblong areas of the outlet orifices are all in one plane and in line with one another.
  • the waveguide shown "in Fig. 1 is made up of three elements 1, 2, 3.
  • Elements 1 and 2 are symmetrical along a vertical plane and constitute shells between which the internal body 3 is fixed.
  • Each shell has a rear flange 4 or 4 ′ and a front flange 6 or 6 ′ joined by a spacer plate 5 or 5 ′,
  • the flanges 4-4 ′ coming in extension of one another, and it is the same for the flanges 6, 6 ′ which leave between them a slot 9 formed by the notches 8, 8 ′.
  • the hollow parts 7 and 7 ′ form a housing for the element 3.
  • the rear flanges 4,4 ′ have a small circular notch 10 10 ′ facing each other after assembly to determine the inlet orifice 11.
  • Fig. 4 shows the case of a guide provided for loudspeaker with compression chamber, and the orifice 11, of a relatively small surface area, lets see the tip 12 of the internal body 3 which will be described later in detail.
  • Fig. 5 shows the case of a waveguide provided for a speaker with an annular diaphragm.
  • the orifice 11 ′ has a larger surface area than in the previous case.
  • Fig. 6 shows the front flange 6 and 6 ′ with their notch 8, 8 ′ determining the slot 9 leaving the body 3 ending on this side with an edge 14.
  • Figs. 2 and 3 we see a waveguide fixed on a loudspeaker 15 and provided with a horn 16.
  • a continuous passage bearing the references 16 to 18 ′. This passage surrounds the body 3 on all sides, and has an almost constant width.
  • the body 3 and the wall of the housing 7, 7 ′ have compatible shapes and dimensions to allow a fluid sheet to pass between them in the conduit provided for this purpose.
  • O 35mm
  • the internal body 3 has the general shape of a cone 19, the base of which is bevelled up to half its height to determine two areas 20, 21 determining the edge 14.
  • the body 3 is fixed by any known means.
  • Fig. 9 we see a single tongue 22, but there is a symmetrical tongue, and during assembly the two tongues are sandwiched between the plates 5 and 5 ′.
  • the waveguide is made of rigid material (metal, plastic, resin) by molding. As explained above, it is made up of three parts, the central part is sandwiched between two identical external parts which determine the walls of the waveguide and include the flanges for fixing to the loudspeaker at the entrance, at flag at the exit. These three parts are assembled by gluing, welding or screwing.
  • the shapes of the internal body and of the housing are such that all the shortest paths from the inlet to the outlet are all the same length, or very similar lengths.
  • the propagation time of the sound wave is constant through the guide.
  • the said waveguide makes it possible to transform the isophase circular wave plane generated by the membrane of a loudspeaker or the orifice of a compression chamber into a rectangular isophase wave plane.
  • the dimensions of the rectangular plane in question are calibrated so that the emerging sound wave propagates in quasi-cylindrical mode.
  • the optimization parameters of a guide are as follows: - either (f1, f2) with f2> f1, the frequency interval over which the guide must be effective and ( ⁇ 1, ⁇ 2) the associated wavelengths, - either l and L respectively the width and length of the guide exit rectangle, L being the vertical side, l the horizontal side.
  • the preferred field of use of the diffusers according to the invention is that of professional sound reinforcement in rooms or open-air spaces which require a large number of juxtaposed loudspeakers.
  • the stacking of several loudspeakers with waveguides in the height direction, the L side being vertical has the effect of generating a flat isophase ribbon from which a coherent cylindrical wave can emerge. Optimal coupling between the speakers is thus achieved.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

Waveguide to fit the output side of a loudspeaker, in front of the diaphragm or in front of the mouth of a compression chamber, lying in the axis of the transducer in question and comprising a channel whose cross-section increases from its input to its output opening, which waveguide is characterised in that the output mouth opening (9) is planar and elongate, in that its channel comprises a passage (between the input mouth (11) and the output opening (9) capable of guiding the waves in a general shape resembling a sheet, and in that the shortest permitted paths in the passage(s) are all practically identical in length from the input mouth to the output mouth of the channel. …<??>For use in sound systems for large areas. …<IMAGE>…

Description

La présente invention concerne l'optimisation des couplages acoustiques entre transducteurs électroacousti­ques voisins, sur toute l'étendue de leur spectre de fréquen­ce, au moyen d'un guide d'ondre particulier. Ce guide d'on­des a pour but de transformer une surface d'onde plane circulaire isophase (membrane de haut-parleur ou sortie de chambre à compression) en une surface d'onde plane rectan­gulaire isophase. L' alignement de plusieurs surfaces rectan­gulaires ainsi formées constitue un ruban plan isophase d'où peu émerger une onde progressive cylindrique cohérente. plusieurs transducteurs ainsi couplés générent une onde cylindrique cohérente alors que ces mêmes transducteurs sans le guide d'onde de l'invention générent autant d'ondes pro­gressives sphériques interférant les unes avec les autres.The present invention relates to the optimization of acoustic couplings between neighboring electroacoustic transducers, over the whole extent of their frequency spectrum, by means of a particular waveguide. The purpose of this waveguide is to transform an isophase circular planar wave surface (loudspeaker membrane or outlet of a compression chamber) into an isophase rectangular planar wave surface. The alignment of several rectangular surfaces thus formed constitutes an isophase flat ribbon from which a coherent cylindrical progressive wave can emerge. several transducers thus coupled generate a coherent cylindrical wave while these same transducers without the waveguide of the invention generate as many spherical traveling waves interfering with each other.

Le guide d'ondes sonores comporte une entrée circulaire et une sortie rectangulaire de telle manière que le temps de propagation de l'onde entre entrée et sortie soit constant, quelque soit le chemin acoustique emprunté.The sound waveguide has a circular input and a rectangular output so that the propagation time of the wave between input and output is constant, whatever the acoustic path taken.

Le guide d'onde s'adapte devant un haut-parleur ou devant l'orifice d'une chambre de compression suivant l'axe du transducteur considéré, et comporte un conduit s'évasant de l'entrée jusqu'à une aire de sortie caractérisé par le fait que l'aire de l'orifice de sortie du guide d'on­de est plane et oblongue, que son conduit comporte un passa­ge (entre l'orifice d'entrée et l'aire de sortie) évoquant la forme générale d'une nappe, que les chemins les plus courts permis dans le ou les passages en forme de nappe sont tous de longueurs pratiquement égales pour aller de l'orifice d'entrée à l'orifice de sortie du conduit.The waveguide adapts in front of a loudspeaker or in front of the orifice of a compression chamber along the axis of the transducer considered, and comprises a conduit widening from the inlet to an outlet area characterized by the fact that the area of the outlet opening of the waveguide is flat and oblong, that its duct has a passage (between the inlet opening and the outlet area) evoking the general shape of 'a sheet, that the shortest paths allowed in the sheet-like passage (s) are all of practically equal length to go from the inlet orifice to the outlet orifice of the conduit.

La forme dite en nappe est obtenue par défor­mation des parois du conduit ou par incorporation d'un ou plu­sieurs corps internes au conduit, ou à la fois par déformation des parois du conduit et par incorporation de un ou plusieurs corps internes au dit conduit.The so-called sheet form is obtained by deformation of the walls of the conduit or by incorporation of one or more bodies internal to the conduit, or both by deformation of the walls of the conduit and by incorporation of one or more bodies internal to said conduit.

Le corps interne peut présenter diverses for­mes et être constitué en plusieurs éléments. Ce corps peut présenter l'aspect général d'une pyramide aplatie, ou d'un cône aplati dont la pointe pénètre dans l'orifice d'entrée, et dont l'autre extrémité est biseautée de façon à ce que son arête affleure l'aire de sortie du conduit suivant l'axe de la dite sortie.The internal body can have various shapes and be made up of several elements. This body may have the general appearance of a flattened pyramid, or of a flattened cone, the point of which penetrates into the entry orifice, and the other end of which is bevelled so that its edge is flush with the outlet area of the conduit along the axis of said outlet.

Le diffuseur est prévu pour fonctionner avec plusieurs haut-parleurs et plusieurs guides d'ondes. Dans ce cas les aires oblongues des orifices de sorties sont toutes dans un plan et dans le prolongement les unes des autres.The diffuser is designed to work with several speakers and several waveguides. In this case, the oblong areas of the outlet orifices are all in one plane and in line with one another.

Pour mieux faire comprendre l'invention, il est donné ci-après un exemple de réalisation d'un guide d'ondes représenté par les dessins annexés dans lesquels

  • Fig. 1 est une vue en perspective d'un diffu­seur,
  • Fig. 2 est une coupe axiale horizontale
  • Fig. 3 est une coupe axiale verticale
  • Fig. 4 est une vue arrière du guide pour haut-parleur à chambre de compression,
  • Fig. 5 est une vue arrière pour haut-parleur à diaphragme annulaire,
  • Fig. 6 est une vue avant,
  • Fig. 7 est une coupe suivant VII-VII de la Fig. 5,
  • Fig. 8 est une coupe suivant VIII-VIII de la Fig. 5,
  • Fig. 9 montre la forme du corps interne,
  • Fig. 10 est une vue de côté du corps interne,
  • Fig. 11 est une vue de dessus du corps interne,
  • Fig. 12 est une vue de face du corps interne.
To better understand the invention, there is given below an embodiment of a waveguide represented by the accompanying drawings in which
  • Fig. 1 is a perspective view of a diffuser,
  • Fig. 2 is a horizontal axial section
  • Fig. 3 is a vertical axial section
  • Fig. 4 is a rear view of the guide for a compression chamber speaker,
  • Fig. 5 is a rear view for an annular diaphragm speaker,
  • Fig. 6 is a front view,
  • Fig. 7 is a section along VII-VII of FIG. 5,
  • Fig. 8 is a section along VIII-VIII of FIG. 5,
  • Fig. 9 shows the shape of the internal body,
  • Fig. 10 is a side view of the internal body,
  • Fig. 11 is a top view of the internal body,
  • Fig. 12 is a front view of the internal body.

Le guide d'onde représenté" en Fig. 1 est formé de trois éléments 1, 2, 3.The waveguide shown "in Fig. 1 is made up of three elements 1, 2, 3.

Les éléments 1 et 2 sont symétriques suivant un plan vertical et constituent des coques entre lesquelles est fixé le corps interne 3, Chaque coque comporte un flas­que arrière 4 ou 4′ et un flasque avant 6 ou 6′ réunis par une plaque entretoise 5 ou 5′, les flasques 4-4′ venant en prolongement l'un de l'autre, et il en est de même pour les flasques 6, 6′ qui laissent subsister entre-eux une fente 9 formée par les échancrures 8, 8′. Les parties creu­ses 7 et 7′ forment un logement pour l'élément 3.Elements 1 and 2 are symmetrical along a vertical plane and constitute shells between which the internal body 3 is fixed. Each shell has a rear flange 4 or 4 ′ and a front flange 6 or 6 ′ joined by a spacer plate 5 or 5 ′, The flanges 4-4 ′ coming in extension of one another, and it is the same for the flanges 6, 6 ′ which leave between them a slot 9 formed by the notches 8, 8 ′. The hollow parts 7 and 7 ′ form a housing for the element 3.

Les flasques arrières 4,4′ comportent une petite échancrure circulaire 10 10′ se faisant face après assemblage pour déterminer l'orifice d'entrée 11.The rear flanges 4,4 ′ have a small circular notch 10 10 ′ facing each other after assembly to determine the inlet orifice 11.

La Fig. 4 montre le cas d'un guide prévu pour haut-parleur à chambre de compression, et l'orifice 11, d'une superficie relativement faible, laisse voir la pointe 12 du corps interne 3 qui sera plus loin décrit en détail.Fig. 4 shows the case of a guide provided for loudspeaker with compression chamber, and the orifice 11, of a relatively small surface area, lets see the tip 12 of the internal body 3 which will be described later in detail.

La Fig. 5 montre le cas d'un guide d'onde prévu pour un haut-parleur à diaphragme annulaire. L'orifice 11′ est d'une superficie plus grande que dans le cas précé­dent. On voit en 13 l'extrémité d'un autre corps interne.Fig. 5 shows the case of a waveguide provided for a speaker with an annular diaphragm. The orifice 11 ′ has a larger surface area than in the previous case. We see at 13 the end of another internal body.

La Fig. 6 montre les flasque avant 6 et 6′ avec leur échancrure 8, 8′ déterminant la fente 9 laissant le corps 3 se terminer de ce côté par une arête 14.Fig. 6 shows the front flange 6 and 6 ′ with their notch 8, 8 ′ determining the slot 9 leaving the body 3 ending on this side with an edge 14.

Sur les Fig. 2 et 3 on voit un guide d'onde fixé sur un haut-parleur 15 et muni d'un pavillon 16. On voit qu'entre le corps 3 et un logement 7, 7′ subsiste un passage continu portant les références 16 à 18′. Ce passage entoure le corps 3 de tous les côtés, et comporte une largeur à peu près constante.In Figs. 2 and 3 we see a waveguide fixed on a loudspeaker 15 and provided with a horn 16. We see that between the body 3 and a housing 7, 7 ′ remains a continuous passage bearing the references 16 to 18 ′. This passage surrounds the body 3 on all sides, and has an almost constant width.

Le corps 3 et la paroi du logement 7, 7′ ont des formes et dimensions compatibles pour laisser passer entre eux une nappe fluide dans le conduit prévu à cet effet. Dans l'exemple de réalisation présenté :
O = 35mm, diamètre de l'orifice de sortie de la chambre de compression,
a = 50°, angle du cône (entrée) et du biseau (sortie),
I = 30mm, largeur de l'orifice rectangulaire de sortie,
L = 220mm, hauteur de l'orifice rectangulaire de sortie,
A = 112mm, demi-longueur du dispositif.The body 3 and the wall of the housing 7, 7 ′ have compatible shapes and dimensions to allow a fluid sheet to pass between them in the conduit provided for this purpose. In the example of embodiment presented:
O = 35mm, diameter of the outlet of the compression chamber,
a = 50 °, angle of the cone (inlet) and the bevel (outlet),
I = 30mm, width of the rectangular outlet,
L = 220mm, height of the rectangular outlet,
A = 112mm, half length of the device.

Il est bien entendu que ces dimensions ne sont pas limitatives, mais données simplement à titre documentai­re pour illustrer l'exemple donné.It is understood that these dimensions are not limiting, but given simply for documentary purposes to illustrate the example given.

Le corps interne 3 a la forme générale d'un cône 19 dont la base est biseautée jusqu'à la moitié de sa hauteur pour déterminer deux plages 20,21 déterminant l'arête 14. Le corps 3 est fixé par tout moyen connu. Sur la Fig. 9 on voit une seule languette 22, mais il existe une languette symétrique, et lors du montage les deux lan­guettes sont prises en sandwich entre les plaques 5 et 5′.The internal body 3 has the general shape of a cone 19, the base of which is bevelled up to half its height to determine two areas 20, 21 determining the edge 14. The body 3 is fixed by any known means. In Fig. 9 we see a single tongue 22, but there is a symmetrical tongue, and during assembly the two tongues are sandwiched between the plates 5 and 5 ′.

Le guide d'onde est réalisé en matériau rigide (métal, plastique, résine) par moulage. Ainsi qu'exposé précédemment, il est constitué de trois pièces, la pièce centrale est prise en sandwich entre deux pièces identiques extérieures qui déterminent les parois du guide d'onde et comprennent les flasques de fixation au haut-parleur à l'en­trée, au pavillon à la sortie. Ces trois pièces sont assem­blées par collage, soudure ou vissage.The waveguide is made of rigid material (metal, plastic, resin) by molding. As explained above, it is made up of three parts, the central part is sandwiched between two identical external parts which determine the walls of the waveguide and include the flanges for fixing to the loudspeaker at the entrance, at flag at the exit. These three parts are assembled by gluing, welding or screwing.

Les formes du corps interne et du logement sont telles que tous les chemins les plus courts pour aller de l'orifice d'entrée à l'orifice de sortie ont tous la même longueur, ou des longueurs très voisines. Au cours du fonctionnement le temps de propagation de l'onde sonore est constant à travers le guide.The shapes of the internal body and of the housing are such that all the shortest paths from the inlet to the outlet are all the same length, or very similar lengths. During operation, the propagation time of the sound wave is constant through the guide.

Ainsi le dit guide d'onde permet de transfor­mer le plan d'onde circulaire isophase généré par la membra­ne d'un haut-parleur ou l'orifice d'une chambre à compression en un plan d'onde isophase rectangulaire. Les dimensions du plan rectangulaire en question sont calibrées de manière à ce que l'onde sonore émergente se propage en mode quasi cylindrique.Thus the said waveguide makes it possible to transform the isophase circular wave plane generated by the membrane of a loudspeaker or the orifice of a compression chamber into a rectangular isophase wave plane. The dimensions of the rectangular plane in question are calibrated so that the emerging sound wave propagates in quasi-cylindrical mode.

Les paramètres d'optimisation d'un guide sont les suivantes :
- soit (f1, f2) avec f2 > f1, l'intervalle de fréquence sur lequel le guide doit être efficace et (λ₁, λ ₂) les lon­gueurs d'ondes associées,
- soit l et L respectivement les largeur et longueur du rectangle de sortie du guide, L étant le côté vertical, l le côté horizontal.The optimization parameters of a guide are as follows:
- either (f1, f2) with f2> f1, the frequency interval over which the guide must be effective and (λ₁, λ ₂) the associated wavelengths,
- either l and L respectively the width and length of the guide exit rectangle, L being the vertical side, l the horizontal side.

Dans une propagation en mode cylindrique, l'axe du cylindre étant vertical, pour que le rectangle de sortie soit un plan isophase, il faut que les conditions suivantes soient remplies :

  • i = largeur du conduit <λ₂
  • ii = a≦30°
  • iii = soit δ l'écart maximal entre les diffé­rents chemins acoustiques possibles dans le guide, il faut δ≦λ2/4
In a propagation in cylindrical mode, the axis of the cylinder being vertical, so that the exit rectangle is an isophase plane, it is necessary that the following conditions are fulfilled:
  • i = width of the duct <λ₂
  • ii = a ≦ 30 °
  • iii = either δ the maximum difference between the different possible acoustic paths in the guide, faut ≦ λ 2/4

Pour que la propagation soit effectivement cylindrique le long de l'axe vertical, il faut que :

  • iv : L> quelques λ₁
  • v : l ≦λ₂
For the propagation to be effectively cylindrical along the vertical axis, it is necessary that:
  • iv: L> some λ₁
  • v: l ≦ λ₂

Le domaine de prédilection d'utilisation des diffuseurs selon l'invention est celui de la sonorisation professionnelle des salles ou des espaces en plein air qui requièrent un grand nombre de haut-parleurs juxtaposés.The preferred field of use of the diffusers according to the invention is that of professional sound reinforcement in rooms or open-air spaces which require a large number of juxtaposed loudspeakers.

L'empilement de plusieurs haut-parleurs avec guides d'onde dans le sens de la hauteur, le côté L étant vertical a pour effet de générer un ruban plan isophase d'où peut émerger une onde cylindrique cohérente. Un coupla­ge optimal entre les haut-parleurs est ainsi réalisé.The stacking of several loudspeakers with waveguides in the height direction, the L side being vertical has the effect of generating a flat isophase ribbon from which a coherent cylindrical wave can emerge. Optimal coupling between the speakers is thus achieved.

Claims (10)

1 guide d'onde s'adaptant à la sortie d'un haut-parleur, devant la membrane ou devant l'orifice d'une chambre de compression, suivant l'axe du transducteur considéré, et comportant un conduit s'évasant de son entrée à son aire de sortie, guide d'onde caractérisé par le fait que l'aire de l'orifice de sortie (9) est plane et oblongue, que son conduit comporte un passage (entre l'orifice d'entrée (11) et l'aire de sortie (9) propre à guider les ondes suivant une forme générale évoquant une nappe, que les chemins les plus courts permis dans le ou les passages sont tous de longueurs pratiquement identiques pour aller de l'orifice d'entrée à l'orifice de sortie du conduit.1 waveguide adapting to the output of a loudspeaker, in front of the membrane or in front of the orifice of a compression chamber, along the axis of the transducer considered, and comprising a conduit which widens from its entry to its exit area, waveguide characterized in that the area of the exit orifice (9) is planar and oblong, that its duct has a passage (between the entry orifice (11) and the exit area (9) suitable for guiding the waves in a general shape evoking a sheet, that the shortest paths allowed in the passage or passages are all of practically identical lengths going from the entry orifice to the outlet of the duct. 2 Guide d'onde selon la revendication 1, caractérisé par le fait que la forme dite en nappe du passage est obtenue par déformation des parois du conduit.2 waveguide according to claim 1, characterized in that the so-called sheet form of the passage is obtained by deformation of the walls of the conduit. 3 Guide d'onde selon la revendication 1 caractérisé par le fait que la forme dite en nappe du passage est obtenue par incorporation d'un ou plusieurs corps internes (3) au conduit.3 wave guide according to claim 1 characterized in that the so-called sheet form of the passage is obtained by incorporating one or more internal bodies (3) to the conduit. 4 Guide d'onde selon la revendication 1 caractérisé par le fait que la forme dite en nappe du passage est obtenue à la fois par la déformation du conduit et par incorporation d'un ou plusieurs corps internes (3) au dit conduit.4 waveguide according to claim 1 characterized in that the so-called sheet form of the passage is obtained both by the deformation of the conduit and by incorporation of one or more internal bodies (3) to said conduit. 5 Guide d'onde selon la revendication 3 ou 4 caractérisé par le fait qu'il est formé de trois éléments, que les élé­ments 1 et 2 sont symétriques suivant un plan vertical et constituent des coques entre lesquelles est fixé le corps interne (3), que chaque coque comporte un flasque arrière (4 ou 4′) et un flasque avant (6 ou 6′) réunis par une plaque entretoise (5 ou 5′) partiellement déformée pour déterminer le logement de l'élément interne (3).5 waveguide according to claim 3 or 4 characterized in that it is formed of three elements, that the elements 1 and 2 are symmetrical along a vertical plane and constitute shells between which is fixed the internal body (3) , that each shell has a rear flange (4 or 4 ′) and a front flange (6 or 6 ′) joined by a spacer plate (5 or 5 ′) partially deformed to determine the housing of the internal element (3). 6 Guide d'onde selon la revendication 5 caractérisé par le fait que les flasques arrières (4 et 4′) sont placés en prolongement l'un de l'autre, qu'ils comportent chacun une petite échancrure circulaire (10-10′) se faisant face après assemblage pour déterminer l'orifice d'entrée (11).6 waveguide according to claim 5 characterized in that the rear flanges (4 and 4 ′) are placed in extension of one another, that they each have a small circular notch (10-10 ′) facing each other after assembly to determine the inlet orifice (11). 7 - Guide d'onde selon la revendication 5 caractérisé par le fait que les flasques avants (6 et 6′) comportent chacun une échancrure (8, 8′) rectangulaire, se faisant face après assemblage, pour déterminer l'orifice de sortie (9) en forme de fente.7 - Waveguide according to claim 5 characterized in that the front flanges (6 and 6 ′) each have a rectangular notch (8, 8 ′), facing each other after assembly, to determine the outlet orifice ( 9) slit-shaped. 8 - Guide d'onde selon l'ensemble des revendications 5, 6 et 7, caractérisé par le fait que le corps interne évoque l'aspect général d'un cône aplati ou d'une pyramide aplatie, dont la pointe (12) pénètre dans l'orifice d'entrée (11) et dont l'autre extrêmité est biseautée de façon à ce que son arête affleure l'aire de sortie (9) du conduit suivant l'axe de la dite sortie en forme de fente.8 - Waveguide according to all of claims 5, 6 and 7, characterized in that the internal body evokes the general appearance of a flattened cone or a flattened pyramid, the point (12) of which penetrates in the inlet orifice (11) and the other end of which is bevelled so that its edge is flush with the outlet area (9) of the conduit along the axis of said outlet in the form of a slot. 9 - Guide d'onde selon la revendication 8 caractérisé par le fait que le corps interne (3) est fixé dans le conduit à l'aide de languettes (22) parallèles à son axe et permet­tant de le maintenir régulièrement espacé des parois du dit conduit.9 - waveguide according to claim 8 characterized in that the internal body (3) is fixed in the conduit using tongues (22) parallel to its axis and allowing to keep it regularly spaced from the walls of said drove. 10 - Diffuseur comportant plusieurs guides d'onde selon l'une quelconque des revendications précédentes caractérisé par le fait que les guides d'onde sont montés en ligne (cha­cun à la sortie d'un haut-parleur) de façon que les aires oblongues des fentes de sorties (9) se trouvent toutes dans un même plan et dans le prolongement les unes des autres.10 - Diffuser comprising several waveguides according to any one of the preceding claims, characterized in that the waveguides are mounted in line (each at the outlet of a loudspeaker) so that the oblong areas of the outlet slots (9) are all in the same plane and in the extension of each other.
EP89400530A 1988-02-29 1989-02-24 Cylindrical acoustic wave guide Expired - Lifetime EP0331566B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8802481A FR2627886B1 (en) 1988-02-29 1988-02-29 CYLINDRICAL SOUND WAVE GUIDE
FR8802481 1988-02-29

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EP0331566A1 true EP0331566A1 (en) 1989-09-06
EP0331566B1 EP0331566B1 (en) 1994-06-01

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EP89400530A Expired - Lifetime EP0331566B1 (en) 1988-02-29 1989-02-24 Cylindrical acoustic wave guide

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US (1) US5163167A (en)
EP (1) EP0331566B1 (en)
DE (1) DE68915582T2 (en)
ES (1) ES2054041T3 (en)
FR (1) FR2627886B1 (en)

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Also Published As

Publication number Publication date
FR2627886B1 (en) 1994-05-13
ES2054041T3 (en) 1994-08-01
FR2627886A1 (en) 1989-09-01
DE68915582T2 (en) 1995-01-19
DE68915582D1 (en) 1994-07-07
EP0331566B1 (en) 1994-06-01
US5163167A (en) 1992-11-10

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