EP1187094A1 - Dispositif de sonorisation à guide d'onde acoustique - Google Patents
Dispositif de sonorisation à guide d'onde acoustique Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- conicoid
- generator
- acoustic
- focal point
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
-
- 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 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
Description
- 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.
- 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.
- 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.
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.
- 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.
- 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.
- 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.
- 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.
- 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).
- 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.
- 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).
- 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.
- 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.
- 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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0011496 | 2000-09-08 | ||
FR0011496A FR2813986B1 (fr) | 2000-09-08 | 2000-09-08 | Dispositif de sonorisation a guide d'onde acoustique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1187094A1 true EP1187094A1 (fr) | 2002-03-13 |
EP1187094B1 EP1187094B1 (fr) | 2004-11-24 |
Family
ID=8854124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01402280A Expired - Lifetime EP1187094B1 (fr) | 2000-09-08 | 2001-09-03 | Dispositif de sonorisation à guide d'onde acoustique |
Country Status (5)
Country | Link |
---|---|
US (1) | US6585077B2 (fr) |
EP (1) | EP1187094B1 (fr) |
JP (1) | JP4897161B2 (fr) |
DE (1) | DE60107336T2 (fr) |
FR (1) | FR2813986B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005104609A1 (fr) * | 2004-03-25 | 2005-11-03 | Active Audio | Dispositif de sonorisation a controle de rayonnement geometrique et electronique |
FR2994046A1 (fr) * | 2012-07-27 | 2014-01-31 | Jean Noel Duchamp | Dispositif de sonorisation a pavillon et reflecteur confondus |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7324654B2 (en) * | 2000-07-31 | 2008-01-29 | Harman International Industries, Inc. | Arbitrary coverage angle sound integrator |
EA006223B1 (ru) * | 2001-11-01 | 2005-10-27 | Верисайн, Инк. | Способ и система для проверки достоверности удалённой базы данных |
US7068805B2 (en) * | 2003-07-11 | 2006-06-27 | Earl Russell Geddes | Acoustic waveguide for controlled sound radiation |
US7275621B1 (en) | 2005-01-18 | 2007-10-02 | Klipsch, Llc | Skew horn for a loudspeaker |
JP2008278145A (ja) * | 2007-04-27 | 2008-11-13 | Victor Co Of Japan Ltd | スピーカシステム用音波行路長補正構造 |
US8351630B2 (en) * | 2008-05-02 | 2013-01-08 | Bose Corporation | Passive directional acoustical radiating |
US8917896B2 (en) | 2009-09-11 | 2014-12-23 | Bose Corporation | Automated customization of loudspeakers |
US9111521B2 (en) | 2009-09-11 | 2015-08-18 | Bose Corporation | Modular acoustic horns and horn arrays |
US9049519B2 (en) | 2011-02-18 | 2015-06-02 | Bose Corporation | Acoustic horn gain managing |
EP2922050A1 (fr) | 2014-03-10 | 2015-09-23 | Ciare s.r.l. | Guide d'ondes acoustique |
NL2015783B1 (nl) * | 2015-11-12 | 2017-06-02 | Mastenbroek Erik | Geluidsgolfgeleider, geluidsgolfgeleidermodule, en luidsprekerinrichting. |
Citations (5)
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FR528154A (fr) * | 1917-06-09 | 1921-11-08 | Louis Lumiere | Système d'appareil récepteur et transmetteur des ondes sonores |
US2643727A (en) * | 1950-01-31 | 1953-06-30 | Elipson S A | Sound transmitting device with an ellipsoidal reflector |
US4033431A (en) * | 1975-11-19 | 1977-07-05 | Ebejer James G | Acoustic crossover speaker enclosure |
DE3439996A1 (de) * | 1984-08-03 | 1986-03-06 | Piet de Amstelveen Reuver | Muschelfoermiger lautsprecherkasten sowie verfahren zu dessen herstellung |
US5900593A (en) * | 1995-07-31 | 1999-05-04 | Adamson; Alan Brock | Loudspeaker system |
Family Cites Families (7)
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JPS5213251B2 (fr) * | 1973-06-01 | 1977-04-13 | ||
US4235301A (en) * | 1979-06-04 | 1980-11-25 | Mitchell Robert W | Folded column speaker enclosure |
DE3637910A1 (de) * | 1986-11-06 | 1988-05-19 | Joachim Weckler | Lautsprechergehaeuse |
JPH09149487A (ja) * | 1995-11-24 | 1997-06-06 | Matsushita Electric Ind Co Ltd | 電気音響変換システム |
US5716254A (en) * | 1996-07-26 | 1998-02-10 | Bowes; William L. | Turkey call |
US5889876A (en) * | 1997-05-01 | 1999-03-30 | Billings; Bart P. | Hemispherical speaker system |
JP3732007B2 (ja) * | 1998-04-30 | 2006-01-05 | ティーオーエー株式会社 | ホーンスピーカ |
-
2000
- 2000-09-08 FR FR0011496A patent/FR2813986B1/fr not_active Expired - Lifetime
-
2001
- 2001-09-03 DE DE60107336T patent/DE60107336T2/de not_active Expired - Lifetime
- 2001-09-03 EP EP01402280A patent/EP1187094B1/fr not_active Expired - Lifetime
- 2001-09-07 JP JP2001271492A patent/JP4897161B2/ja not_active Expired - Lifetime
- 2001-09-10 US US09/948,662 patent/US6585077B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR528154A (fr) * | 1917-06-09 | 1921-11-08 | Louis Lumiere | Système d'appareil récepteur et transmetteur des ondes sonores |
US2643727A (en) * | 1950-01-31 | 1953-06-30 | Elipson S A | Sound transmitting device with an ellipsoidal reflector |
US4033431A (en) * | 1975-11-19 | 1977-07-05 | Ebejer James G | Acoustic crossover speaker enclosure |
DE3439996A1 (de) * | 1984-08-03 | 1986-03-06 | Piet de Amstelveen Reuver | Muschelfoermiger lautsprecherkasten sowie verfahren zu dessen herstellung |
US5900593A (en) * | 1995-07-31 | 1999-05-04 | Adamson; Alan Brock | Loudspeaker system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005104609A1 (fr) * | 2004-03-25 | 2005-11-03 | Active Audio | Dispositif de sonorisation a controle de rayonnement geometrique et electronique |
US7426278B2 (en) | 2004-03-25 | 2008-09-16 | Active Audio | Sound device provided with a geometric and electronic radiation control |
CN1965608B (zh) * | 2004-03-25 | 2011-08-17 | 活动音频公司 | 具有几何和电子辐射控制的公共广播系统 |
FR2994046A1 (fr) * | 2012-07-27 | 2014-01-31 | Jean Noel Duchamp | Dispositif de sonorisation a pavillon et reflecteur confondus |
Also Published As
Publication number | Publication date |
---|---|
JP2002135878A (ja) | 2002-05-10 |
EP1187094B1 (fr) | 2004-11-24 |
JP4897161B2 (ja) | 2012-03-14 |
FR2813986B1 (fr) | 2002-11-29 |
FR2813986A1 (fr) | 2002-03-15 |
DE60107336T2 (de) | 2005-12-01 |
US6585077B2 (en) | 2003-07-01 |
DE60107336D1 (de) | 2004-12-30 |
US20020029926A1 (en) | 2002-03-14 |
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