EP1187094B1 - Dispositif de sonorisation à guide d'onde acoustique - Google Patents
Dispositif de sonorisation à guide d'onde acoustique Download PDFInfo
- Publication number
- EP1187094B1 EP1187094B1 EP01402280A EP01402280A EP1187094B1 EP 1187094 B1 EP1187094 B1 EP 1187094B1 EP 01402280 A EP01402280 A EP 01402280A EP 01402280 A EP01402280 A EP 01402280A EP 1187094 B1 EP1187094 B1 EP 1187094B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- focus
- section
- waveguide
- exit
- units
- 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.)
- Expired - Lifetime
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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 reinforcement device of the type having an acoustic waveguide and a coupled acoustic generator to this waveguide.
- the invention relates more particularly to the shape of the waveguide forming an acoustic flag in order to obtain a good mastery of the sound dispersion by means of a relatively compact set and especially shallow.
- a box forming an acoustic enclosure and enclosing at least one generator acoustics and its waveguide is generally bulky and especially quite deep since the depth of the acoustic enclosure depends essentially the length of the pavilion.
- French Patent No. 88.02481 defines the association of a generator acoustic and acoustic waveguide. Between entry and exit waveguides are arranged consistent obstacles to standardize the acoustic paths between the input and the output of the waveguide. The wave front obtained is rectangular in shape and straight profile.
- U.S. Patent No. 5,900,593 implements principles comparable to the previous one but additionally uses a mirror shaped dihedral curved in an arc to change the direction of propagation of the his.
- the wavefront obtained is of rectangular shape and of convex profile.
- U.S. Patent No. 4,033,431 also discloses the association of a acoustic generator and an acoustic waveguide with an input of the acoustic waveguide connecting to the acoustic generator and a output from which propagates an acoustic wave.
- the waveguide has a first section in the extension of the exit and a second stretch arranged in the extension of the entrance, these sections are connecting by a reflective flat surface.
- U.S. Patent No. 2,643,727 discloses a sound reinforcement device with an ellipsoid reflector.
- the aim of the invention is to form an acoustic wavefront of chosen shape, of convex, concave or plane profile, by means of a guide of reduced dimensions.
- a second object of the invention is to propose an arrangement of sound reinforcement device allowing to couple several of them to allow a good control of the shape of the acoustic wavefront issued by all acoustic generators, without creation interfering interference.
- the invention is based on the principles of geometric acoustics, that is, the field of acoustics based on ray theory. eille therefore applies to the propagation of sn laws known in optics, particularly the laws of reflection of the rays on the conicoidal surfaces.
- We conicoid surface means a surface generated by the rotation of a curve of the family of conics. More particularly in the context of the invention has been found and implemented acoustic properties advantageous, related to acoustic reflections on surfaces such than a hyperboloid, a paraboloid or an ellipsoid.
- the basic principle of the invention lies in the fact that, thanks the use of such a reflection surface as an acoustic mirror, can move the apparent emission point of a sound source.
- the waveguide as described can perfectly be extended by another pavilion.
- the internal volume of said second section is delimited by the intersections of a second lateral surface generated by a generator passing through the second focus of said conicoid and leaning on said contour of said reflecting surface, and said surface reflective surface, and said reflective surface itself, not including the common volume portion with said first section.
- first and second sections are perfectly equivalent in the definition of first and second sections to consider that the internal volume of the second section comprises said common portion and that the latter is removed from the internal volume of said first section.
- the definition geometry of said first and second sections of the acoustic waveguide is only a convenient way to understand the overall shape of the internal volume of the waveguide.
- the second section includes, in the vicinity of this second home, a enlarged mouthpiece connecting to said second side surface.
- This mouthpiece is shaped and dimensions adapted to the acoustic generator related to it.
- the conicoid is a hyperboloid
- this configuration facilitates the coupling of several devices similar, with a transmission of a convex wavefront without creation interference between sources.
- FIG. 1 there is an output 11 of selected shape of an acoustic waveguide still undefined.
- this output through which the sound must radiate to an audience, has an approximately rectangular outline but it preferably fits on the surface of a sphere.
- the output of the waveguide is therefore preferably in a convex spherical surface.
- the center of this sphere is noted S 1 in FIG. 1.
- the radius of the sphere is chosen by those skilled in the art so that the acoustic flag C which extends 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 sound directivity projected beyond the output 11.
- the theoretical form of such a flag is shown in Figure 1 and it is understood that the sound device that would result the combination of such a pavilion and an acoustic generator placed at point S 1 , would be relatively bulky, especially at depth.
- the chosen conicoid is a hyperboloid.
- a first focus of this hyperboloid is confounded with the point S 1 (the characteristics of the hyperboloid are calculated for that).
- the position of the second focus S 2 of the hyperboloid is also defined. This point is shown in FIG. 2.
- This second focus 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 convex surface outlet 11 which is ideally inscribed on the surface of a center sphere S 1 may in fact be relatively flat, since the chosen diameter of this sphere is relatively large. Even when 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 focus, an enlarged mouth 24 connecting to the rest of said second side surface.
- Said mouth is of shape and dimensions adapted to the acoustic generator 22 which is attached thereto.
- Figure 5 shows the complete sound system. It consists of the waveguide 26 (composed of the first and second sections 16, 18 and the mouth 24) and the acoustic generator 22 connected to the widened mouth 24.
- the waveguide 26 is obtained by molding, or injection when the walls thereof are sufficiently rigid. In theory, it is especially important that the conicoid portion is acoustically reflective material but in practice all the walls of the waveguide are made of the same material.
- the emitted wavefront is convex.
- the device that has just been described can be used as it is or integrated into a speaker box.
- the dimensions of the box, especially its depth, are lower than what would be necessary with a waveguide C, as shown in Figure 1.
- the rest of the casing may be arranged to house one or more complementary speakers.
- the waveguide 26 has an outlet 11 comprises a substantially rectangular, with rounded corners here, associated with a curved reflecting surface 14a having the shape of part of a paraboloid.
- the limits of the reflective surface 14 a are determined in the same way as previously considering that said first focus is this time rejected to infinity.
- said first side surface 13a is generated by a generatrix perpendicular to the planar surface of said outlet 11a and moving parallel to itself based on the contour of this output.
- Said second focus in the vicinity of which we will place the input of the waveguide and therefore the generator 22 is in fact the sole focus of the paraboloid.
- This second focus, close to the generator 22 is located opposite the concave face of the reflective surface 14 has the paraboloidal shape.
- the internal volume of the second section 18 a is as previously defined by the intersections of a second lateral surface 17 is generated by a generatrix passing through the second focal point and resting on the contour of the reflecting surface 14 is not included, of course the common volume portion with said first section 16 a .
- the reflecting surface 14 a is also arranged close as possible to the outlet; we see that it "outcrops" two rounded corners of it.
- the second side surface 17 a has a concave face (forward) and a convex face (backward).
- the enlarged mouth 24 a is defined, as indicated above, at the end of said second side surface 17a to be able to connect to the sound generator 22.
- the transmitted wavefront is plane.
- 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 the theoretical sphere is one of the foci of the conic section which defines said reflecting surface 14 b and the conic section is an ellipsoid.
- Figures 8 to 10 more particularly illustrate the possibility of coupling, without interference, 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 global sound device comprises several units each formed of 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 of an acoustical generator 22 and a waveguide 26 has associated conform to the device which has been described with reference to Figure 6, c that is to say with a reflective surface formed by a portion of paraboloid. These units are positioned side by side so that the outputs (defined in flat surfaces) are aligned and thus coplanar. In this case, all the acoustic generators positioned at the focus of a reflective surface in the form of a paraboloid, are themselves aligned.
- the device consists of three units each formed of an acoustical generator 22 and a waveguide 26 b associated, according to Figure 7, that is to say comprising a reflective surface forming an ellipsoid.
- the three units are positioned side by side so that the corresponding first foci are merged into a point S ' 1 of the listening domain where the sound seems recreated.
- each unit can be integrated in a shaped box so that the desired conditioning is achieved by juxtaposing the walls side of such boxes.
- the reflecting surface defined by a conicoid portion tends towards a band. , or 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.
- FIG. 8 A guide to The wave in which the reflecting surface is thus reduced to tend towards its generating curve is shown in FIG. 8 where the analogous structural elements bear the same reference numerals with the index c .
- the conicoid surface is reduced to a thin strip of reflective surface 14 c substantially hyperboloid.
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 (10)
- 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, ledit guide d'onde acoustique comportant 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, caractérisé en ce que ces deux tronçons se raccordent en partie par une surface réfléchissante courbe (14) ayant la forme d'une partie de conicoïde, en ce que ladite entrée se trouve à un second foyer (S2) de ladite conicoïde, et en ce que le volume interne dudit premier tronçon (16) est 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, etde 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 1, caractérisé en ce que le volume interne dudit second tronçon (18) est délimité par les intersections d'une seconde surface latérale (17) engendrée par une génératrice passant par le 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 (16).
- Dispositif selon la revendication 2, caractérisé en ce que ledit second tronçon (18) comporte au voisinage dudit second foyer (S2) une embouchure élargie (24) se raccordant à ladite seconde surface latérale, ladite embouchure étant de forme et de dimensions adaptées audit générateur acoustique (22) 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 acoustique (22), se situant en regard de la face concave de celle-ci.
- Dispositif selon l'une des revendications 1 à 3, 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 4 ou 5, caractérisé en ce que le contour de ladite sortie (11, 11b) s'inscrit à la surface d'une sphère dont le centre est confondu avec ledit premier foyer (S1).
- Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que ladite conicoïde est une paraboloïde, ledit premier foyer (S1) étant rejeté à l'infini et ledit second foyer, proche dudit générateur acoustique (22), se situant en regard de la face concave de ladite surface réfléchissante (14).
- Dispositif selon l'une des revendications 4 à 6, caractérisé en ce qu'il comporte plusieurs unités formées chacune d'une générateur acoustique (22) 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 confondus.
- Dispositif selon la revendication 7, caractérisé en ce qu'il comporte plusieurs unités formées chacune d'un générateur acoustique (22) et d'un guide d'onde associé et en ce que ces unités sont positionnées de façon que lesdites sorties (11a) soient alignées.
- Dispositif selon la revendication 8 ou 9, 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 EP1187094A1 (fr) | 2002-03-13 |
EP1187094B1 true 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) |
Families Citing this family (13)
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 |
FR2868237B1 (fr) | 2004-03-25 | 2006-05-19 | Xavier Jacques Marie Meynial | Dispositif de sonorisation a controle de rayonnement geometrique et electronique |
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 |
FR2994046B1 (fr) * | 2012-07-27 | 2017-05-19 | Jean Noel Duchamp | Dispositif de sonorisation a pavillon et reflecteur confondus |
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. |
Family Cites Families (12)
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 |
JPS5213251B2 (fr) * | 1973-06-01 | 1977-04-13 | ||
US4033431A (en) * | 1975-11-19 | 1977-07-05 | Ebejer James G | Acoustic crossover speaker enclosure |
US4235301A (en) * | 1979-06-04 | 1980-11-25 | Mitchell Robert W | Folded column speaker enclosure |
DE3439996A1 (de) * | 1984-08-03 | 1986-03-06 | Piet de Amstelveen Reuver | Muschelfoermiger lautsprecherkasten sowie verfahren zu dessen herstellung |
DE3637910A1 (de) * | 1986-11-06 | 1988-05-19 | Joachim Weckler | Lautsprechergehaeuse |
US5900593A (en) * | 1995-07-31 | 1999-05-04 | Adamson; Alan Brock | Loudspeaker system |
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
Also Published As
Publication number | Publication date |
---|---|
JP2002135878A (ja) | 2002-05-10 |
EP1187094A1 (fr) | 2002-03-13 |
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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