FR2895201A1 - Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band - Google Patents
Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band Download PDFInfo
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- FR2895201A1 FR2895201A1 FR0512852A FR0512852A FR2895201A1 FR 2895201 A1 FR2895201 A1 FR 2895201A1 FR 0512852 A FR0512852 A FR 0512852A FR 0512852 A FR0512852 A FR 0512852A FR 2895201 A1 FR2895201 A1 FR 2895201A1
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- loudspeaker
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- concave membrane
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- 238000009792 diffusion process Methods 0.000 claims description 13
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- 239000000463 material Substances 0.000 claims description 4
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
- 239000011496 polyurethane foam Substances 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 abstract description 5
- 239000002250 absorbent Substances 0.000 abstract description 5
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- 230000005855 radiation Effects 0.000 description 4
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Classifications
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- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
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- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
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- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Haut-parleur a n membranes coaxiales, n z 3, montees sur un meme axe etLoudspeaker with n coaxial membranes, n z 3, mounted on the same axis and
enceinte acoustique correspondante. 1. Domaine de 1'invention Le domaine de ('invention est de celui du son et de 1'audio. Plus precisement, l'invention concerne des haut-parleurs et des enceintes acoustiques correspondantes mettant en oeuvre des technologies co-axiales. L'invention s'applique notamment, mais non exclusivement, dans des systemes d'ecoute professionnelle en studio, dans des systemes professionnels dans le domaine du cinema, dans des systemes audio grand public en stereophonie deux canaux ou multicanal, ou encore dans des systemes grand public Home Cinema. 2. L'art anterieur Pour reproduire fidelement un champ sonore couvrant l'ensemble de la bande de frequences audibles par 1'oreille humaine (qui s'etend de 20Hz a 20kHz), la solution la plus evidente consiste a separer cette bande de frequences audibles en plusieurs sous-bandes (ou voies, par exemple aigus, medium et graves) et a mettre en oeuvre pour chacune de ces sous-bande un haut-parleur dedie. Ainsi, dans le cadre de la conception d'une enceinte acoustique traditionnelle, on met en oeuvre plusieurs haut-parleurs, chacun comprenant une membrane et etant dedie a une sous-bande (ou voie). Bien entendu, chacun des haut-parleurs est etudie pour presenter les meilleures performances dans la sousbande de frequence a laquelle it est dedie. Dans la configuration classique d'une enceinte a plusieurs haut-parleurs, on superpose les haut-parleurs sur la facade de ('enceinte de fawn a restituer 1'ensemble de la bande de frequences audibles. Cependant, cette disposition traditionnelle des haut-parleurs presente un inconvenient en terme de rayonnement, et en particulier dans le cadre du champ proche (c'est-a-dire au voisinage de 1'enceinte) compte tenu des differences de marche entre Ies ondes sonores emises par 1es differents haut--parleurs et revues par 1'auditeur. corresponding loudspeaker. FIELD OF THE INVENTION The field of the invention is that of sound and audio, and more specifically the invention relates to loudspeakers and corresponding loudspeakers employing coaxial technologies. invention applies in particular, but not exclusively, in professional listening systems in the studio, in professional systems in the field of cinema, in consumer audio systems in stereophony two channels or multichannel, or in large systems 2. To the prior art To faithfully reproduce a sound field covering the entire frequency band audible by the human ear (which ranges from 20Hz to 20kHz), the most obvious solution is to separate this band of audible frequencies in several subbands (or channels, for example treble, medium and bass) and to implement for each of these sub-band a dedicated speaker.So, as part of the design of an aco speaker In traditional practice, several loudspeakers are used, each comprising a membrane and being dedicated to a sub-band (or channel). Of course, each of the speakers is studied to present the best performance in the frequency subband to which it is dedicated. In the conventional configuration of a multi-speaker speaker, the loudspeakers are superimposed on the front of the loudspeaker so as to reproduce the entire audible frequency band, however this traditional arrangement of the loudspeakers has a disadvantage in terms of radiation, and in particular in the context of the near field (that is to say in the vicinity of 1'entie) given the differences in the market between the sound waves emitted by the different speakers and reviewed by the auditor.
En effet, comme illustre sur la figure 1, du fait que les trajets 14, 15 et 16 parcourus par les ondes sonores respectivement anises par les membranes 111, 112 et 113 des haut-parleurs 11, 12, 13 et rect.'s par 1'auditeur 10 ne sont pas identiques, les temps de propagation sont differents ce qui a pour consequence 1'apparition d'irregularites sur la courbe de reponse de 1'enceinte par effet d'interferences destructrives ou constructives. Par ailleurs, un autre inconvenient de cette disposition des haut-parleurs sur la facade de l'enceinte est qu'il entraine des phenomenes de diffraction dus a la rupture sur les bords de l'enceinte. Indeed, as shown in Figure 1, because the paths 14, 15 and 16 traveled by the sound waves respectively aniseed by the membranes 111, 112 and 113 of the speakers 11, 12, 13 and rect 's by The listener 10 are not identical, the propagation times are different, which results in the appearance of irregularities on the response curve of the speaker by the effect of destructive or constructive interferences. Furthermore, another disadvantage of this arrangement of the speakers on the front of the enclosure is that it causes diffraction phenomena due to breakage on the edges of the enclosure.
Ainsi, pour pallier ces inconvenients, une solution alternative a donc ete proposee. Elie consiste a monter les membranes des differents haut-parleurs sur un meme axe. Une telle disposition est nominee configuration << co-axiale >>. On obtient ainsi un haut-parleur multi-voies, a chacune des voie etant associe un transducteur (classiquement constitue d'une membrane et du dispositif electromagnetique a base d'un aimant permettant d'actionner la membrane). Ces technologies co-axiales permettent d'obtenir un rayonnement coherent des differents transducteurs, meme en champ proche. On illustre, en relation avec la figure 2, un haut-parleur a trois voies coaxiales, chacune des voies etant associee a une membrane, respectivement 20, 21, 22. Dans ce montage co-axial des membranes, les membranes restituant les sons aigus 20, les sons hauts medium 21, et les sons bas medium 22 ont le meme centre d'emission 23. Le temps de propagation des ondes sonores du centre d'emission 23 jusqu'a 1'auditeur 24 est identique pour toutes ces membranes. Ainsi, a la difference des enceintes classiques a sources sonores etalees, les enceintes comprenant des membranes co-axiales permettent d'obtenir un rayonnement coherent des differents transducteurs, meme en champ proche. La societe Cabasse a commercialise un tel haut-parleur co-axial a trois voies (aigus, hauts medium et bas medium) sous la reference TC22. Les trois membranes convexes (lorsque vue par 1'auditeur) sont montees sur un meme axe. De ce fait, le temps de propagation jusqu'a 1'auditeur est identique pour toutes les membranes et la courbe de reponse sonore de 1'enceinte ne presente plus d'irregularites lorsque 1'auditeur se deplace dans le champ proche. Le rayonnement sonore dans 1'axe, et en dehors de l'axe de 1'enceinte peut ainsi 'are parfaitement controle. Thus, to overcome these drawbacks, an alternative solution has been proposed. Elie consists in mounting the membranes of the different speakers on the same axis. Such an arrangement is named "coaxial" configuration. A multi-channel loudspeaker is thus obtained, with each of the channels being associated with a transducer (conventionally consisting of a membrane and the electromagnetic device based on a magnet making it possible to actuate the membrane). These co-axial technologies make it possible to obtain a coherent radiation of the different transducers, even in the near field. FIG. 2 illustrates a coaxial three-way loudspeaker, each of the channels being associated with a membrane, respectively 20, 21, 22. In this co-axial assembly of the membranes, the membranes reproducing the treble sounds. 20, the medium high sounds 21, and the low medium sounds 22 have the same emission center 23. The propagation time of the sound waves from the transmitting center 23 to the listener 24 is identical for all these membranes. Thus, unlike conventional loudspeaker speakers, the enclosures comprising coaxial membranes make it possible to obtain coherent radiation from the different transducers, even in the near field. Cabasse has marketed such a three-way coaxial loudspeaker (treble, high medium and low medium) under reference TC22. The three convex membranes (when seen by the auditor) are mounted on the same axis. As a result, the delay to the listener is the same for all the membranes and the loudness response curve of the loudspeaker no longer shows any irregularities as the listener moves into the near field. The sound radiation in the axis, and outside the axis of the enclosure can thus be perfectly controlled.
Cependant, un inconvenient de ce haut-parleur a trois voies co-axiales est qu'il ne permet pas de restituer, sauf en acceptant une reduction notable de l'efficacite, les sons dans les basses frequences du spectre des frequences audibles par 1'oreille humaine (les graves situes entre 20Hz et quelques centaines de Hz). 3. Objectifs de 1'invention L'invention a notamment pour objectif de pallier ces inconvenients de fart anterieur. Plus precisement, un objectif de l'invention, dans au moins un de ses modes de realisation, est de fournir un haut-parleur co-axial qui restitue 1'ensemble du spectre des frequences audibles par 1'oreille humaine, c'est-a-dire de 20Hz a 20kHz, tout en presentant une forte efficacite, un faible taux de distorsion et un indice de directivite stable sur l'ensemble du spectre audible. Un autre objectif de 1'invention, dans au moins un de ses modes de realisation, est de fournir un tel haut-parleur qui permette de maximiser la surface de la membrane restituant les basses frequences. However, a disadvantage of this loudspeaker has three coaxial channels is that it does not allow to restore, except by accepting a significant reduction in efficiency, the sounds in the low frequencies of the spectrum of audible frequencies by 1 ' human ear (bass located between 20Hz and a few hundred Hz). 3. OBJECTIVES OF THE INVENTION The invention aims in particular to overcome these drawbacks of anterior art. More specifically, an object of the invention, in at least one of its embodiments, is to provide a coaxial loudspeaker which reproduces the entire spectrum of audible frequencies by the human ear, that is, ie from 20Hz to 20kHz, while having a high efficiency, a low distortion rate and a stable directivity index across the entire audible spectrum. Another object of the invention, in at least one of its embodiments, is to provide such a loudspeaker that maximizes the surface of the membrane restoring the low frequencies.
Encore un autre objectif de l'invention, dans au moins un de ses modes de realisation, est de fournir une telle technique qui permette de reduire 1'encombrement du haut-parleur. L'invention a encore pour objectif de fournir une telle technique qui soit simple a mettre en oeuvre. 4. Caracteristiques principales de 1'invention Ces objectify, ainsi que d'autres qui apparaitront par la suite sont atteints a 1'aide d'un haut-parleur a n membranes coaxiales, n 3, montees sur un meme axe, chacune des membranes etant associee a une bande de frequences distincte. Selon la presente invention, un tel haut-parleur comprend : - une membrane concave s'etendant selon un premier lens de parcours dudit axe ; un bloc a n-1 membranes coaxiales convexes s'etendant selon un second sens de parcours dudit axe ; et, dans un tel haut-parleur, le bloc est positionne devant la membrane concave, selon le second sens de parcours dudit axe. Yet another object of the invention, in at least one of its embodiments, is to provide such a technique which makes it possible to reduce the encumbrance of the loudspeaker. The invention also aims to provide such a technique that is simple to implement. 4. Main Features of the Invention These and other objects which will appear later are achieved by means of a loudspeaker with coaxial membranes, n 3, mounted on the same axis, each of the membranes being associated with a separate frequency band. According to the present invention, such a loudspeaker comprises: a concave membrane extending along a first lens of travel of said axis; a block having n-1 convex coaxial membranes extending in a second direction of travel of said axis; and in such a loudspeaker, the block is positioned in front of the concave membrane, in the second direction of travel of said axis.
Le principe general de !'invention repose sur une disposition particuliere dans un haut-parleur d'une membrane, par exemple, dediee aux basses frequences et d'un bloc de membranes co-axiales convexes restituant le reste de la bande de frequences audibles permettant de maximiser la surface de la membrane dediee aux basses frequences. The general principle of the invention is based on a particular arrangement in a loudspeaker of a membrane, for example, dedicated to low frequencies and a block of convex coaxial membranes restoring the rest of the band of audible frequencies allowing to maximize the surface of the membrane dedicated to low frequencies.
Ainsi, un tel haut-parleur co-axial restitue !'ensemble du spectre des frequences audibles par 1'oreille humaine tout en permettant de maximiser la surface de la membrane restituant les basses frequences pour un encombrement donne. En effet, grace a cette disposition particuliere de la membrane concave (avantageusement dediee aux basses frequences du spectre) par rapport au bloc de membranes convexes, celle-ci peut presenter une surface importante pour un volume donne par rapport a : une disposition classique ou la membrane concave est disposee dans un caisson de basse sepal-6 du haut parleur co-axial ; une autre disposition que pourrait envisager 1'homme du metier des enceintes acoustiques qui serait de placer cette membrane concave en peripherie des membranes convexes. Avantageusement, n = 4. Preferentiellement, le haut-parleur selon !'invention comprend des moyens de maintien maintenant ledit bloc devant la membrane concave. Selon une caracteristique avantageuse de la presente invention, les moyens de maintien comprennent un boitier comprenant une face avant presentant une ouverture en son centre prevue pour recevoir le bloc, et une face arriere faisant face a la membrane concave. Thus, such a coaxial speaker reproduces the entire spectrum of frequencies audible by the human ear while maximizing the surface of the membrane restoring the low frequencies for a given size. Indeed, thanks to this particular arrangement of the concave membrane (advantageously dedicated to the low frequencies of the spectrum) with respect to the block of convex membranes, it can have a large surface area for a given volume compared to a conventional arrangement or the Concave membrane is arranged in a sepal-6 subwoofer of the co-axial loudspeaker; another provision that might be envisaged by a person skilled in the field of loudspeakers who would place this concave membrane on the periphery of the convex membranes. Advantageously, n = 4. Preferably, the loudspeaker according to the invention comprises holding means maintaining said block in front of the concave membrane. According to an advantageous feature of the present invention, the holding means comprises a housing comprising a front face having an opening in its center intended to receive the block, and a rear face facing the concave membrane.
Avantageusement, le haut-parleur selon !'invention comprend un caisson dans lequel sont montees les membranes et auquel est fixe un chassis supportant la membrane concave, et en ce que les moyens de maintien comprennent egalement au moms un bras de liaison, solidaire, par une premiere de ses extremites, du boitier et, par une deuxieme de ses extremites, du chassis et/ou du caisson. Advantageously, the loudspeaker according to the invention comprises a box in which the membranes are mounted and to which is fixed a frame supporting the concave membrane, and in that the holding means also comprise at least one connecting arm, secured by a first of its ends, the case and, by a second of its ends, the frame and / or the box.
Selon une caracteristique avantageuse de 1'invention, le haut-parleur comprend des moyens de diffusion d'au moms une onde sonore emise par rune au moms des membranes du bloc, les moyens de diffusion etant places sur la face avant du boitier de facon qu'au moms une partie de la face avant du boitier presente un relief en saillie et/ou en creux. According to an advantageous characteristic of 1'invention, the loudspeaker comprises means of diffusion of at least one sound wave emitted by rune at least the membranes of the block, the diffusion means being placed on the front face of the box so that at least part of the front face of the housing has a projecting and / or recessed relief.
Ainsi, les moyens de diffusion, qui dissymetrise la geometrie de la face avant du boitier, permettent de diffuser les ondes sonores emises lateralement par les membranes du bloc et donc de minimiser 1'energie des ondes diffractees par les bords du caisson (ou par les bras de liaison ou par les bords de la cavite formee par la membrane concave ou par tout autre element du haut-parleur rencontre par ces ondes laterales) vers l'auditeur (ondes des sources secondaires). Preferentiellement, le haut-parleur selon 1'invention comprend des moyens d'absorption d'au moms une onde sonore emise par ladite membrane concave, lesdits moyens d'absorption etant places entre ledit bloc et ladite membrane concave. Thus, the diffusion means, which dissymmetrizes the geometry of the front face of the case, make it possible to diffuse the sound waves emitted laterally by the membranes of the block and thus to minimize the energy of the waves diffracted by the edges of the box (or by the connecting arm or by the edges of the cavity formed by the concave membrane or by any other element of the speaker meets by these lateral waves) towards the listener (waves of secondary sources). Preferably, the loudspeaker according to the invention comprises means of absorption of at least one sound wave emitted by said concave membrane, said absorption means being placed between said block and said concave membrane.
Ainsi, ces moyens d'absorption permettent d'absorber les ondes sonores emises par la membrane concave qui se propageant dans la cavite entre la membrane concave et le boitier. Avantageusement, les moyens d'absorption sont places sur la face arriere du boitier. Thus, these absorption means absorb the sound waves emitted by the concave membrane which propagates in the cavity between the concave membrane and the housing. Advantageously, the absorption means are placed on the rear face of the housing.
Selon une caracteristique avantageuse de 1'invention, les moyens d'absorption comprennent au moms un des materiaux appartenant au groupe comprenant : la mousse de melamine ; la mousse de polyurethane ; la mousse de polyethylene. Preferentiellement, le caisson est de forme sensiblement spherique. According to an advantageous characteristic of the invention, the absorption means comprise at least one of the materials belonging to the group comprising: melamine foam; polyurethane foam; polyethylene foam. Preferentially, the box is of substantially spherical shape.
Selon un premier mode de realisation avantageux de 1'invention, les moyens de maintien maintiennent le bloc a l'interieur d'une cavite creee par la membrane concave. Selon un second mode de realisation avantageux de 1'invention, les moyens de maintien maintiennent ledit bloc au dessus de la cavite creee par ladite membrane concave. Avantageusement, le caisson comprend au moins une ouverture pratiquee a proximite du bloc, et formant un event pour au moins une onde sonore emise par la membrane concave. According to a first advantageous embodiment of the invention, the holding means hold the block inside a cavity created by the concave membrane. According to a second advantageous embodiment of the invention, the holding means maintain said block above the cavity created by said concave membrane. Advantageously, the box comprises at least one opening practiced close to the block, and forming an event for at least one sound wave emitted by the concave membrane.
Avantageusement, la bande de frequence associee a la membrane concave correspond a une bande grave couvrant au moins certaines frequences comprises entre 20 et 200 Hz. Preferentiellement, le haut-parleur selon 1'invention comprend des moyens de filtrage numeriques d'un courant alimentant des moyens electromagnetiques pour actionner au moins une desdites membranes. Ces moyens de filtrage numeriques permettent d'obtenir une courbe de reponse spectrale constante et un indice de directivite stable sur la bande de frequences restituees par le haut-parleur, et ce, meme au niveau des zones de transition spectrales des membranes (ou zones de chevauchement des reponses des membranes sur la reponse du haut-parleur). L'invention concerne egalement une enceinte acoustique, comprenant au moins un haut-parleur tel que precedemment decrit. 5. Liste des figures D'autres caracteristiques et avantages de 1'invention apparaitront plus clairement a la lecture de la description suivante d'un mode de realisation preferentiel, donne a titre de simple exemple illustratif et non limitatif, et des dessins annexes, parmi lesquels : -la figure 1 illustre les differences de marche des ondes sonores emises par trois haut-parleurs d'une enceinte acoustique classique selon fart anterieur ; - la figure 2 illustre un haut-parleur co-axial a trois voies selon fart anterieur ; - la figure 3 presente une coupe d'une enceinte acoustique comprenant un haut-parleur a quatre voies co-axiales selon un premier mode de realisation de l'invention ; - Les figures 4 A et 4B presentent des vues en perspective (figure 4A) et de face (figure 4B) du boitier equipe du systeme de diffusion des ondes sonores emises par les membranes convexes de 1'enceinte selon le premier mode de realisation de 1'invention ; - la figure 5 presente une coupe de 1'enceinte selon le premier mode de realisation de 1'invention dans laquelle sont disposes des moyens d'absorption des ondes sonores emises par la membrane concave dans la cavite entre la membrane concave et le boitier ; - la figure 6 presente le schema, en coupe (figure 6A) et vu de face (figure 6B) d'une enceinte acoustique comprenant un haut-parleur a quatre voies co-axiales selon un second mode de realisation de 1'invention. 6. Description d'un mode de realisation de 1'invention On presente, en relation avec la figure 3, un premier mode de realisation d'une enceinte acoustique 30 comprenant un haut-parleur a quatre voies coaxiales conforme a l'invention. Advantageously, the frequency band associated with the concave membrane corresponds to a bass band covering at least some frequencies between 20 and 200 Hz. Preferably, the loudspeaker according to the invention comprises digital filtering means of a current supplying power. electromagnetic means for actuating at least one of said membranes. These digital filtering means make it possible to obtain a constant spectral response curve and a stable directivity index on the frequency band reproduced by the loudspeaker, even at the level of the spectral transition zones of the membranes (or zones of overlapping membrane responses on the speaker response). The invention also relates to an acoustic enclosure, comprising at least one speaker as previously described. 5. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and non-limiting example, and accompanying drawings, among which: FIG. 1 illustrates the differences in operation of the sound waves emitted by three loudspeakers of a conventional acoustic loudspeaker according to the prior art; FIG. 2 illustrates a three-way coaxial loudspeaker according to prior art; FIG. 3 shows a section of an acoustic loudspeaker comprising a four-way coaxial loudspeaker according to a first embodiment of the invention; FIGS. 4A and 4B show perspective (FIG. 4A) and front view (FIG. 4B) views of the case equipped with the sound wave diffusion system emitted by the convex membranes of the enclosure according to the first embodiment of FIG. invention; FIG. 5 shows a section of the enclosure according to the first embodiment of the invention in which there are arranged means for absorbing sound waves emitted by the concave membrane into the cavity between the concave membrane and the housing; FIG. 6 shows the diagram, in section (FIG. 6A) and seen from the front (FIG. 6B) of an acoustic enclosure comprising a four-way coaxial loudspeaker according to a second embodiment of the invention. 6. Description of an Embodiment of the Invention With reference to FIG. 3, a first embodiment of an acoustic enclosure 30 comprising a coaxial four-way loudspeaker according to the invention is presented.
Bien entendu, selon des variantes de ce premier mode de realisation, 1'enceinte acoustique 30 comprend tout autre nombre (n 3) de voies coaxiales. Le caisson 37 de 1'enceinte 30 de ce premier mode de realisation est une sphere creuse (par exemple en bois, mais elle peut titre egalement realisee en toute autre matiere) dont une calotte a ete decoupee sur la face avant laissant place a une ouverture circulaire 38. Dans ce premier mode de realisation, 1'enceinte 30 comporte deux ensembles de production sonore. Un premier ensemble 34 comprend des moyens electromagnetiques 343 classiques actionnant une membrane concave 341 s'etendant selon un premier sens de parcours 351 d'un axe 35. Cette membrane concave possede un diametre externe d'environ 55 cm (ce diametre pouvant titre different selon des variantes de ce premier mode de realisation de 1'invention) et est associee de maniere souple (au moyen d'un element elastique 3411) a un chassis 342. Ce premier ensemble sonore est insere dans le caisson 37, le chassis 342 etant fixe sur le pourtour de 1'ouverture circulaire 38 du caisson. Ce premier ensemble de production sonore permet de restituer une bande de basses frequences couvrant au moms certaines frequences comprises entre 20 Hz et 200 Hz. Dans des variantes de ce premier mode de realisation, le premier ensemble de production sonore couvre d'autres plages de frequences. Un second ensemble de production sonore 36 comprend un boitier 366 (encore appele lentille) et un bloc 364 de membranes co-axiales. Ce second ensemble 36 est maintenu a 1'interieur de la cavite creee par la membrane concave 341. Le boitier 366 possede une face avant presentant une ouverture en son centre prevue pour recevoir le bloc de membranes 364, et une face arriere faisant face a la membrane concave 341. Le boitier 366 est fixe au caisson 37 par 1'intermediaire de trois bras de liaison 39 (moyens de maintien) dont la premiere extremite est solidaire du boitier 366 et la seconde extremite du chassis 342 ce qui facilite le montage et le demontage du chassis 342 sur le caisson 37. Dans une variante de ce premier mode de realisation non representee, la seconde extremite du bras de liaison 39 pourrait titre fixee directement au caisson 37 ou alors simultanement au caisson 37 et au chassis 342. Ainsi, le bloc de membranes 364 est maintenu a l'interieur de la cavite creee par la membrane concave 341. Bien entendu, tout autre nombre de bras de maintien peut titre mis en couvre dans le cadre de la presente invention, d'autre part, tout autre moyen de maintien peut titre envisage. Par exemple, le bloc de membranes co-axiales 364 est le module reference TC22 commercialise par la societe CABASSE. I1 est forme notamment de trois membranes co-axiales 361, 362 et 363 montees convexes sur un chassis 342 et s'etendant selon un second sens de parcours 352 de 1'axe 35. Ces trois membranes 361, 362 et 363 restituent respectivement les frequences aigues, haut medium, et bas medium et sont actives par des moyens electromagnetiques (non representes). Grace au second ensemble de production sonore 36, !'enceinte 30 selon le second mode de realisation de !'invention permet de restituer tout le spectre audible par l'oreille humaine (de 20 Hz a 20 KHz) En outre, le boitier 366 supportant le bloc TC22 est equipe d'un systeme de diffusion 41 des ondes sonores (encore appele moyen de diffusion) sur la face 40. Les figures 4 A et 4B presentent des vues en perspective (figure 4A) et de face (figure 4B) du boitier 366 equipe du systeme de diffusion 41 des ondes sonores anises par Ies membranes convexes de !'enceinte selon le premier mode de realisation de !'invention. Lorsque les membranes 361, 362 et 363 du bloc 364 sont actionnees par les moyens electromagnetiques, elles emettent des ondes sonores se propageant sensiblement dans toutes les directions de 1'espace. Ainsi, ces ondes se propagent selon !'axe 35 du bloc de membranes co-axiales 364 mais egalement lateralement, dans le plan des membranes 361, 362 et 363. Ces ondes sonores laterales sont diffractees notamment par les bords du caisson 37 (mais egalement par les bras de liaison 39, par les bords de la cavite formee par la membrane concave 341 ou par tout autre element de !'enceinte 30 rencontre par ces ondes laterales) notamment vers l'auditeur. L'effet de cette diffraction est equivalent a la presence de sources sonores secondaires placees au niveau des bords du caisson 37 qui emettent vers l'auditeur. Les ondes de ces sources secondaires cumulees aux ondes sonores directement emises par les membranes 361, 362 et 363 du bloc de membranes 364 generent des accidents sur la courbe spectrale de reponse de !'enceinte 30 qui correspondent soit a des pics lorsqu'il s'agit d'interferences constructives (ondes sonores en phase), soit a des trolls lorsqu'il s'agit d'interferences destructives (ondes sonores en opposition de phase). L'effet de ces sources secondaires est d'autant plus important que 1'environnement proche du haut-parleur est symetrique. Of course, according to variants of this first embodiment, the acoustic chamber 30 comprises any other number (n 3) of coaxial channels. The casing 37 of the chamber 30 of this first embodiment is a hollow sphere (for example made of wood, but it can also be made of any other material), a cap has been cut on the front face leaving room for an opening. Circular 38. In this first embodiment, the enclosure 30 comprises two sets of sound production. A first assembly 34 comprises conventional electromagnetic means 343 actuating a concave membrane 341 extending in a first direction of travel 351 of an axis 35. This concave membrane has an outer diameter of about 55 cm (this diameter being able to differ according to variants of this first embodiment of the invention) and is associated in a flexible manner (by means of an elastic element 3411) to a frame 342. This first sound unit is inserted into the box 37, the frame 342 being fixed around the circular opening 38 of the box. This first set of sound production makes it possible to reproduce a low frequency band covering at least some frequencies between 20 Hz and 200 Hz. In variants of this first embodiment, the first sound production unit covers other frequency ranges. . A second sound production assembly 36 comprises a housing 366 (still called a lens) and a block 364 of coaxial membranes. This second assembly 36 is held inside the cavity created by the concave membrane 341. The housing 366 has a front face having an opening in its center intended to receive the membrane block 364, and a rear face facing the concave membrane 341. The housing 366 is fixed to the casing 37 by means of three connecting arms 39 (holding means), the first end of which is integral with the casing 366 and the second end of the frame 342 which facilitates assembly and operation. disassembly of the frame 342 on the box 37. In a variant of this first embodiment not shown, the second end of the link arm 39 could be fixed directly to the box 37 or simultaneously to the box 37 and the frame 342. Thus, the Membrane block 364 is held inside the cavity created by the concave membrane 341. Of course, any other number of holding arms may be covered under the present invention, on the other hand, any other means of maintenance may be considered. For example, the block of co-axial membranes 364 is the reference module TC22 marketed by the company CABASSE. It is formed in particular of three coaxial membranes 361, 362 and 363 mounted convex on a chassis 342 and extending in a second direction of travel 352 of the axis 35. These three membranes 361, 362 and 363 respectively restore the frequencies acute, high medium, and low medium and are active by electromagnetic means (not shown). Thanks to the second set of sound production 36, the speaker 30 according to the second embodiment of the invention makes it possible to restore all the spectrum audible by the human ear (from 20 Hz to 20 KHz) In addition, the housing 366 supporting block TC22 is equipped with a system 41 for broadcasting sound waves (also called diffusion means) on face 40. FIGS. 4A and 4B show perspective (FIG. 4A) and front (FIG. Case 366 equipped with the diffusion system 41 of sound waves aniseed by the convex membranes of the enclosure according to the first embodiment of the invention. When the membranes 361, 362 and 363 of the block 364 are actuated by the electromagnetic means, they emit sound waves propagating substantially in all directions of space. Thus, these waves propagate along the axis 35 of the coaxial membrane block 364 but also laterally in the plane of the membranes 361, 362 and 363. These lateral sound waves are diffracted notably by the edges of the caisson 37 (but also by the connecting arms 39, by the edges of the cavity formed by the concave membrane 341 or by any other element of the chamber 30 meets by these side waves) especially to the listener. The effect of this diffraction is equivalent to the presence of secondary sound sources placed at the edges of the box 37 which emit towards the listener. The waves of these secondary sources accumulated with the sound waves directly emitted by the membranes 361, 362 and 363 of the membrane block 364 generate accidents on the spectral response curve of the enclosure 30 which correspond to either peaks when it occurs. It acts of constructive interferences (sound waves in phase), or has trolls when it is about destructive interferences (sound waves in opposition of phase). The effect of these secondary sources is all the more important as the environment close to the loudspeaker is symmetrical.
Pour pallier ce probleme de diffraction, on met en oeuvre le systeme de diffusion 41. Ce systeme de diffusion 41 est realise sur la face avant 40 du boitier 366 au moyen, par exemple, d'un relief en saillie et/ou en creux, par exemple en marches d'escalier. Ces saillies et/ou en creux pouvant par exemple etre disposes de maniere aleatoires pour former un relief heterogene et non uniforme. Ce relief 41 peut etre obtenu par collage de matiere sur le boitier 366, ou etre prevu lors du moulage du boitier 366 ou par toute autre technique adequate. Ainsi le systeme de diffusion 41, qui dissymetrise la geometrie de la face avant 40 du boitier 364, permet de diffuser les ondes sonores emises lateralement et donc de minimiser l'energie des ondes diffractees vers 1'auditeur (ondes des sources secondaires). Bien entendu, tout relief permettant de diffuser Ies ondes sonores emises lateralement (dans le plan des membranes 361, 362 et 363 du bloc 364) peut etre mis en ceuvre dans le cadre de la presente invention. In order to overcome this diffraction problem, the diffusion system 41 is used. This diffusion system 41 is produced on the front face 40 of the housing 366 by means, for example, of a raised and / or recessed relief, for example, stairs. These projections and / or recesses may for example be arranged randomly to form a heterogeneous and non-uniform relief. This relief 41 can be obtained by bonding material on the case 366, or be provided during molding of the case 366 or by any other suitable technique. Thus, the diffusion system 41, which dissymmetries the geometry of the front face 40 of the housing 364, makes it possible to broadcast the sound waves emitted laterally and thus to minimize the energy of the waves diffracted towards the auditor (secondary source waves). Of course, any relief making it possible to diffuse the sound waves emitted laterally (in the plane of the membranes 361, 362 and 363 of the block 364) can be implemented within the framework of the present invention.
Selon une variante du premier mode de realisation de l'invention, on ne met pas en ceuvre de systeme de diffusion des ondes sonores sur l'enceinte 30. Selon ce premier mode de realisation de 1'invention, on met, en outre, en ceuvre des moyens d'absorption des ondes sonores emises par la membrane concave 341 se propageant dans la cavite entre la membrane concave 341 et le boitier 366. Par exemple, on peut choisir des moyens d'absorption qui soient particulierement efficaces sur la bande de frequences allant de 400 Hz a 500 Hz afin d'absorber de maniere efficace les ondes sonores emises par la membrane concave 341. According to a variant of the first embodiment of the invention, a sound wave diffusion system is not used on the chamber 30. According to this first embodiment of the invention, it is also possible to the absorption means of sound waves emitted by the concave membrane 341 propagating in the cavity between the concave membrane 341 and the housing 366. For example, one can choose absorption means which are particularly effective on the frequency band ranging from 400 Hz to 500 Hz in order to effectively absorb the sound waves emitted by the concave membrane 341.
Tel qu'illustre sur la figure 5, ces moyens d'absorption peuvent par exemple etre realises au moyen d'une couche de mousse absorbante 51 de melamine, de polyurethane, de polyethylene, ou de tout autre compose adequat, disposee sur la face arriere de la lentille 366 faisant face a la membrane concave 341. As illustrated in FIG. 5, these absorption means can for example be produced by means of an absorbent foam layer 51 of melamine, polyurethane, polyethylene, or any other suitable compound disposed on the rear face. of the lens 366 facing the concave membrane 341.
Cette couche de mousse absorbante 51 est placee a 1'arriere de la lentille 366 et permet donc d'amortir et d'absorber les ondes acoustiques se propageant dans la cavite entre la membrane concave 341 et 1'arriere de la lentille 366. L'epaisseur de cette couche de mousse absorbante 51 est par exemple de 1 cm sur toute la surface. Selon une variante de ce premier mode de realisation de 1'invention, on ne met pas en oeuvre de moyen d'absorption. Dans une enceinte traditionnelle ou les haut-parleurs sont superposes en facade, le spectre de reponse sonore est dependant de la position de 1'auditeur par rapport aux haut-parleurs, notamment en champ proche. Ainsi, d'une part, la reponse spectrale (stir la bande allant de 20Hz a 20kHz) d'une telle enceinte a une impulsion de type pic de Dirac est deformee par rapport a la reponse impulsionnelle ideale (qui est un sinus cardinal), cette deformation dependant de la position de 1'auditeur. D'autre part, pour une telle enceinte traditionnelle, la mise en oeuvre d'un filtrage numerique des courants alimentant les haut-parleurs de ('enceinte conduit a 1'obtention de reponse et indice de directivite de 1'enceinte qui presentent des irregularites spectrales en fonction de la position de 1'auditeur. Ces irregularites sont notamment presentes au niveau des zones de transition spectrales des hautparleurs (ou zones de chevauchement des reponses des haut-parleurs). Ainsi, dans une telle enceinte traditionnelle, it est necessaire de reajuster les parametres du filtrage pour chaque position de 1'auditeur, ce qui est tres contraignant. Au contraire, dans le cadre d'une enceinte a base d'un haut-parleur a membranes co-axiales tel que 1'enceinte 30 selon le premier mode de realisation de l'invention, d'une part, la reponse a une impulsion de type pic de Dirac est proche de la reponse impulsionnelle ideale (sinus cardinal) sur la bande allant de 20Hz a 20kHz, et ce, quelle que soit la position de 1'auditeur. D'autre part, pour une telle enceinte 30, on petit mettre en oeuvre un filtrage numerique efficace qui ne necessite pas de reajustement des parametres du filtrage pour chaque position de 1'auditeur. This layer of absorbent foam 51 is placed behind the lens 366 and thus makes it possible to dampen and absorb the acoustic waves propagating in the cavity between the concave membrane 341 and the rear of the lens 366. thickness of this layer of absorbent foam 51 is for example 1 cm over the entire surface. According to a variant of this first embodiment of the invention, absorption means are not used. In a traditional speaker or the speakers are superimposed in facade, the sound response spectrum is dependent on the position of the auditor in relation to the speakers, especially in the near field. Thus, on the one hand, the spectral response (in the band from 20 Hz to 20 kHz) of such a speaker with a Dirac peak pulse is deformed with respect to the ideal impulse response (which is a cardinal sinus), this deformation depends on the position of the listener. On the other hand, for such a traditional loudspeaker, the implementation of a digital filtering of the currents supplying the loudspeakers of the loudspeaker leads to the obtaining of a response and a directivity index of the loudspeaker which present irregularities. These irregularities are particularly present at the level of the spectral transition zones of the loudspeakers (or areas of overlapping speaker responses) .Thus, in such a traditional loudspeaker, it is necessary to to adjust the parameters of the filtering for each position of the auditor, which is very restrictive.On the contrary, in the context of an enclosure based on a coaxial diaphragm loudspeaker such as the enclosure 30 according to the first embodiment of the invention, on the one hand, the response to a Dirac peak-type pulse is close to the ideal impulse response (cardinal sinus) on the band from 20 Hz to 20 kHz, and this, whatever the p the hearing of the auditor. On the other hand, for such a chamber 30, it is possible to implement an effective digital filtering that does not require adjustment of the filtering parameters for each position of the listener.
Ainsi, on met en oeuvre, dans 1'enceinte 30 selon le premier mode de realisation de la presente invention, des moyens de filtrage numeriques (au moyen de moyens de traitement numeriques comprenant classiquement une carte electronique et un DSP, pour Digital Signal Processor >) des courants alimentant les premier 34 et second 36 ensembles de production sonore. Ces moyens de filtrage numeriques permettent d'obtenir une courbe de reponse spectrale constante et un indice de directivite stable sur la bande de frequence allant de 20Hz a 20kHz, et ce, meme au niveau des zones de transition spectrales des membranes 341, 361, 362 et 363 (ou zones de chevauchement des reponses des membranes sur la reponse de 1'enceinte 30). Les moyens de filtrage numerique permettent de compenser par des retards numeriques les decalages temporels des ondes sonores provenant des differentes membranes. Ces decalages temporels resultent du fait que les membranes sont situees sur un meme axe mais pas dans un meme plan. Ainsi, ces moyens de filtrage numerique optimisent la directivite des membranes co-axiales pour obtenir une reponse de 1'enceinte co-axiale stable depourvue d'irregularites qui se rapproche de la reponse d'un systeme acoustique a quatre voies ideal dans lequel les quatre transducteurs seraient montes selon un meme axe et dans un meme plan. Dans une variante du premier mode de realisation de l'invention, 1'enceinte 30 ne comprend pas de moyens de filtrage numerique. Thus, in the enclosure 30 according to the first embodiment of the present invention, digital filtering means are used (by means of digital processing means conventionally comprising an electronic card and a DSP for Digital Signal Processor). ) currents supplying the first 34 and second 36 sets of sound production. These digital filtering means make it possible to obtain a constant spectral response curve and a stable directivity index in the frequency band from 20 Hz to 20 kHz, even at the spectral transition regions of the membranes 341, 361, 362 and 363 (or overlapping areas of the membrane responses on the response of the enclosure 30). The digital filtering means make it possible to compensate by digital delays the time delays of the sound waves coming from the different membranes. These time differences result from the fact that the membranes are located on the same axis but not in the same plane. Thus, these digital filtering means optimize the directivity of the coaxial membranes to obtain a response of stable coaxial housing devoid of irregularities which is close to the response of an ideal four-way acoustic system in which the four transducers would be mounted along the same axis and in the same plane. In a variant of the first embodiment of the invention, the enclosure 30 does not include digital filtering means.
On presente maintenant, en relation avec les figures 6A et 6B, le schema, en coupe (figure 6A) et vu de face (figure 6B) d'une enceinte acoustique 60 comprenant un haut-parleur a quatre voies co-axiales selon un second mode de realisation de l'invention. Bien entendu, selon des variantes de ce second mode de realisation, 1'enceinte acoustique 60 comprend tout autre nombre (n z 3) de voies coaxiales. Dans ce second mode de realisation, le caisson 61 de 1'enceinte 60 comprend un premier 610 et un second 611 morceaux de sphere. Le second morceau de sphere 611 est appele ci-apres calotte avant 611. La calotte avant 611 comprend deux ouvertures longitudinales 65 a proximite d'un bloc de membranes co- axiales convexes 644 qui est identique au bloc de membranes 364 precite (1es trois membranes convexes 361, 362 et 363 du bloc 644 s'etendent selon un second sens de parcours 632 d'un axe 63). Ces deux ouvertures 65 constituent des events lateraux 65 pour les ondes sonores emises par une membrane concave 621. L'enceinte 60 comprend deux ensembles de production sonore. With reference to FIGS. 6A and 6B, the diagram in section (FIG. 6A) and seen from the front (FIG. 6B) of an acoustic loudspeaker 60 comprising a four-way coaxial loudspeaker according to a second embodiment of the invention. Of course, according to variants of this second embodiment, the acoustic chamber 60 comprises any other number (n z 3) of coaxial channels. In this second embodiment, the housing 61 of the enclosure 60 includes a first 610 and a second 611 pieces of sphere. The second piece of sphere 611 is hereinafter referred to as the front cap 611. The front cap 611 comprises two longitudinal openings 65 proximate a block of convex coaxial membranes 644 which is identical to the aforementioned membrane block 364 (the three membranes convexes 361, 362 and 363 of the block 644 extend in a second direction of travel 632 of an axis 63). These two openings 65 constitute side vents 65 for the sound waves emitted by a concave membrane 621. The enclosure 60 comprises two sets of sound production.
Un premier ensemble 62 comprend des moyens electromagnetiques 623 classiques actionnant une membrane concave 621 s'etendant selon un premier sens de parcours 631 de 1'axe 63. Cette membrane concave possede un diametre externe d'environ 55 cm (ce diametre pouvant etre different selon des variantes de ce second mode de realisation de l'invention) et est associee de maniere souple (au moyen d'un element elastique non represents) a un chassis 622. Ce premier ensemble sonore est totalement monte a 1'interieur de la partie arriere 610 du caisson 61, le chassis 622 etant fixe sur le pourtour de la calotte avant 611. Ce premier ensemble de production sonore permet de restituer une bande de basses frequences couvrant au moins certaines frequences comprises entre 20 Hz et 200 Hz. Dans des variantes de ce second mode de realisation, le premier ensemble de production sonore couvre d'autres plages de frequences. Un second ensemble de production sonore 64 comprend un boitier 640 (encore appele lentille) et un bloc 644. Ce second ensemble 64 est maintenu audessus de la cavite creee par la membrane concave 621 grace a la solidarisation du boitier 640 a la calotte avant 611 du caisson 61 au moyen par exemple d'un collage ou de tout autre moyen de solidarisation adequat. Ainsi, le bloc de membranes 644 est maintenu au-dessus de la cavite creee par la membrane concave 621. Grace au second ensemble de production sonore 64, 1'enceinte 60 selon le 25 second mode de realisation de 1'invention permet de restituer tout le spectre audible par 1'oreille humaine (de 20 Hz a 20 KHz) Bien entendu, I'enceinte 60 selon le second mode de realisation de 1'invention peut etre avantageusement munie de moyens de diffusion et/ou de moyens d'absorption et/ou de moyens de filtrage numeriques tels que 30 precedemment decrit en relation avec 1'enceinte 30 selon le premier mode de realisation de I'invention. A first assembly 62 comprises conventional electromagnetic means 623 actuating a concave membrane 621 extending in a first direction of travel 631 of the axis 63. This concave membrane has an external diameter of approximately 55 cm (this diameter being able to be different according to variants of this second embodiment of the invention) and is associated in a flexible manner (by means of an elastic element not shown) to a chassis 622. This first sound assembly is fully mounted inside the rear part 610 of the box 61, the frame 622 being fixed on the periphery of the front cap 611. This first set of sound production allows to restore a low frequency band covering at least some frequencies between 20 Hz and 200 Hz. In variants of this second embodiment, the first set of sound production covers other frequency ranges. A second sound production assembly 64 comprises a housing 640 (also called a lens) and a block 644. This second assembly 64 is held above the cavity created by the concave membrane 621 by the fastening of the housing 640 to the front cap 611 of the box 61 by means for example of a bonding or other suitable means of securing. Thus, the membrane block 644 is held above the cavity created by the concave membrane 621. Thanks to the second sound production assembly 64, the chamber 60 according to the second embodiment of the invention makes it possible to restore all the spectrum audible by the human ear (from 20 Hz to 20 KHz) Of course, the chamber 60 according to the second embodiment of the invention can be advantageously provided with diffusion means and / or absorption means and / or digital filtering means as previously described in relation to the enclosure 30 according to the first embodiment of the invention.
Ainsi les enceintes acoustiques 30 et 60 selon ('invention precedemment decrites, qui sont optimisees du point de vue de la directivite dans les zones de transition des differentes voies (graves/bas medium, bas-medium/medium, medium/aigu) s'approchent de la source acoustique ideale (sans irregularites au niveau des bandes de transition). Bien entendu, l'invention n'est pas Iimitee aux exemples de realisation mentionnees ci-dessus. D'autre part, 1'homme du metier peut combiner les premier et second mode de realisation precedemment decrit afin de realiser une enceinte acoustique conforme a la presente invention. Thus the acoustic speakers 30 and 60 according to the invention previously described, which are optimized from the point of view of the directivity in the transition zones of the different channels (bass / low medium, low-medium / medium, medium / high) s' approach to the ideal acoustic source (without irregularities at the level of the transition bands.) Of course, the invention is not limited to the embodiments mentioned above.On the other hand, the person skilled in the art can combine the first and second embodiment previously described in order to realize an acoustic enclosure according to the present invention.
En particulier, l'homme du metier pourra apporter toute variante dans la forme et les constituants des differents elements des enceintes acoustiques 30 et 60 (notamment la forme du caisson, la taille de la membrane concave, des membranes du bloc, le choix de la mousse absorbante, la geometrie de la lentille). L'homme du metier pourra apporter toute variante dans le choix des membranes 361 a 363, 341, 621 et des moyens electromagnetiques d'activation de ces membranes. II pourra ainsi obtenir des haut-parleurs selon ces variantes de l'invention couvrant differents spectres sonores (par exemple les bandes de frequences de 200 Hz a 20000 Hz, ou de 50 Hz a 1000 Hz, ou de 50 Hz a 20000Hz ou toute autre bande de frequence). In particular, the skilled person can provide any variant in the form and components of the different elements of the speakers 30 and 60 (including the shape of the box, the size of the concave membrane, the membranes of the block, the choice of the absorbent foam, the geometry of the lens). The skilled person may provide any variant in the choice of membranes 361 to 363, 341, 621 and electromagnetic means of activation of these membranes. It will thus be possible to obtain loudspeakers according to these variants of the invention covering different sound spectra (for example the frequency bands from 200 Hz to 20000 Hz, or from 50 Hz to 1000 Hz, or from 50 Hz to 20000 Hz or any other frequency band).
Claims (16)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0512852A FR2895201A1 (en) | 2005-12-16 | 2005-12-16 | Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band |
| FR0610916A FR2895202B1 (en) | 2005-12-16 | 2006-12-14 | SPEAKER COMPRISING AT LEAST ONE FIRST MEMBRANE AND A SECOND MEMBRANE PROVIDED COAXALLY AND CORRESPONDING ACOUSTIC ENCLOSURE. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0512852A FR2895201A1 (en) | 2005-12-16 | 2005-12-16 | Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2895201A1 true FR2895201A1 (en) | 2007-06-22 |
Family
ID=36950394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0512852A Pending FR2895201A1 (en) | 2005-12-16 | 2005-12-16 | Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2895201A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3012716A1 (en) * | 2013-10-30 | 2015-05-01 | Devialet | ACOUSTIC SPEAKER HAVING AT LEAST ONE MOBILE CONVEX MEMBRANE SPEAKER IN CONTINUOUS FORM WITH AN ADJACENT BODY |
| CN114097250A (en) * | 2019-06-13 | 2022-02-25 | 大众汽车股份公司 | Vibration damping device and loudspeaker vibration damping system for a motor vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811406A (en) * | 1982-03-31 | 1989-03-07 | Pioneer Electronic Corporation | Compound speaker system |
| GB2250658A (en) * | 1990-12-07 | 1992-06-10 | Canon Res Ct Europe Ltd | Loudspeaker |
| EP0771133A1 (en) * | 1995-10-27 | 1997-05-02 | Harman International Industries Incorporated | Multiple cone electroacoustic transducer |
| EP1515584A1 (en) * | 2003-09-15 | 2005-03-16 | Cabasse SA | Loudspeaker and corresponding loudspeaker enclosure |
-
2005
- 2005-12-16 FR FR0512852A patent/FR2895201A1/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811406A (en) * | 1982-03-31 | 1989-03-07 | Pioneer Electronic Corporation | Compound speaker system |
| GB2250658A (en) * | 1990-12-07 | 1992-06-10 | Canon Res Ct Europe Ltd | Loudspeaker |
| EP0771133A1 (en) * | 1995-10-27 | 1997-05-02 | Harman International Industries Incorporated | Multiple cone electroacoustic transducer |
| EP1515584A1 (en) * | 2003-09-15 | 2005-03-16 | Cabasse SA | Loudspeaker and corresponding loudspeaker enclosure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3012716A1 (en) * | 2013-10-30 | 2015-05-01 | Devialet | ACOUSTIC SPEAKER HAVING AT LEAST ONE MOBILE CONVEX MEMBRANE SPEAKER IN CONTINUOUS FORM WITH AN ADJACENT BODY |
| WO2015062852A1 (en) * | 2013-10-30 | 2015-05-07 | Devialet | Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member |
| US10313783B2 (en) | 2013-10-30 | 2019-06-04 | Devialet | Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member |
| CN114097250A (en) * | 2019-06-13 | 2022-02-25 | 大众汽车股份公司 | Vibration damping device and loudspeaker vibration damping system for a motor vehicle |
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