EP0263748B1 - Electro-acoustic transducer - Google Patents
Electro-acoustic transducer Download PDFInfo
- Publication number
- EP0263748B1 EP0263748B1 EP87402186A EP87402186A EP0263748B1 EP 0263748 B1 EP0263748 B1 EP 0263748B1 EP 87402186 A EP87402186 A EP 87402186A EP 87402186 A EP87402186 A EP 87402186A EP 0263748 B1 EP0263748 B1 EP 0263748B1
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- EP
- European Patent Office
- Prior art keywords
- enclosure
- loud
- electro
- speaker
- acoustic transducer
- 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
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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
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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
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
- H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers
Definitions
- the present invention relates to a particularly efficient and economical electro-acoustic transducer, comprising a flexible enclosure in the form of a revolution around an axis and two loudspeakers mounted back to back in the axis of the enclosure.
- the generally parallelepiped shape of the multi-way speakers imposes on the rear wave of the bass speaker, operating in piston, a constraint which causes a prejudicial deformation of the front wave, transmitting only the sound message.
- this constraint on the rear wave is more or less important depending on the acoustic absorption power of the walls or the degree of sophistication of the vents or baffles intended to weaken the return of the wave.
- patent US-A-3,978,941 which describes an acoustic enclosure in the form of a rigid cylindrical tube held vertically, comprising an active loudspeaker turned upwards and mounted 15 centimeters from the open upper end of said enclosure, the lower end of said tube having a passage opening which allows the transfer of air from inside the chamber to the outside atmosphere. Because the active speaker is enclosed in the speaker tube, edge effects appear, ruining the omnidirectionality of the diffusion of mid and treble sounds.
- patent GB-A-2 101 448 which describes an acoustic transducer formed by a set of cylindrical chambers each comprising back to back an active speaker and a passive speaker, mounted axially at the interior of a rigid enclosure, the length of which gives each chamber a particular fundamental resonant frequency, all the chambers being able to reproduce the almost complete range of audible sounds.
- the transducer advantageously has a cylindrical shape providing a construction convenience contributing to the economy of the system; this particular form is, moreover, entirely suited to another feature of the invention recommending the use of two strictly identical speakers in order to introduce no source of distortions of purely mechanical origin.
- the cylindrical shape of the speaker is ideal for avoiding the edge effects well known in conventional speakers and therefore totally avoiding diffraction of sounds.
- transducers according to the invention can be envisaged: one could for example use a passive speaker with a diameter different from that of the active speaker, or else, the enclosure could be frustoconical, or flared on one side, in hyperboloid of revolution etc ... All the tests nevertheless converge towards an optimal solution providing a cylindrical support and similar speakers.
- the proposed transducer must be suspended vertically, the active loudspeaker being directed upwards and the passive loudspeaker towards the ground at a sufficient distance from the latter.
- the electro-acoustic transducer consists of a first "active" loudspeaker 1, of external diameter equal to 21 cm and having, in a manner known per se, all the electromechanical arrangements allowing a strip bandwidth between 40 and 18,000 Hertz.
- This speaker 1 is mounted on a disc 2 with a diameter equal to 25 cm.
- This disc is preferably produced in a 19 mm thick panel made up of wood chips joined by an epoxy resin.
- a second "passive" speaker similar to the first speaker 1 is also mounted on a disc 4 identical to the disc 2.
- the two discs 2 and 4 which are centered on the same axis at a distance of 50 cm from each other, receive on their periphery a sheet 5, of corrugated cardboard for example, coming to wind on the two discs 2 and 4 to which it is fixed by gluing.
- the grooves of the sheet 5 are arranged along a generatrix of the cylinder 6 thus formed.
- the flexible wall formed by the sheet 5 is lined with a thickness of about 5 cm of rock wool or synthetic wadding 7.
- the cylinder 6 is suspended vertically by means of two cords 8 secured to the disc 2, which hooks onto a support 9 in the form of a bracket, so that the "active" loudspeaker 1 is turned towards the ceiling.
- the same loudspeaker 1 is supplied with power, advantageously using, for example, the cords 8 for supplying the electrical wires 8a from any sound source.
- the loudspeaker 3 is not connected to any source and it is left free to "work” under the sole stresses of the rear wave of the "active" loudspeaker 1 thereby contributing to its suffocation and therefore to the sound reinforcement of the front wave, with which there is total overlap, at least for the low frequency register.
- the electro-acoustic transducer thus described and in accordance with the invention, is advantageously decorated on its side wall 10 so as to better integrate into the environment.
- This same environment also determines the optimal height of the "passive" speaker 3, relative to the ground, by considering a minimum height fixed at 30 cm, so that there is a perfect acoustic coupling between the transducer and the environment.
Abstract
Description
La présente invention concerne un transducteur électro-acoustique particulièrement performant et économique, comportant une enceinte souple en forme de révolution autour d'un axe et deux haut-parleurs montés dos à dos dans l'axe de l'enceinte.The present invention relates to a particularly efficient and economical electro-acoustic transducer, comprising a flexible enclosure in the form of a revolution around an axis and two loudspeakers mounted back to back in the axis of the enclosure.
La grande majorité des enceintes connues à ce jour, comportent deux, trois et parfois quatre haut-parleurs, savamment connectés entre eux pour tenter de couvrir l'ensemble du spectre de fréquences audibles. Cette conception requiert généralement l'intercalation d'un filtre répartiteur de fréquences entre l'arrivée du signal et les différents haut-parleurs. On sait que, dans ce cas, le filtre altère le message sonore en y introduisant de nombreuses modifications :
- réduction très sensible de la plage dynamique,
- réduction du rendement global de l'enceinte,
- modification de la phase aux fréquences de coupure qui entraîne une augmentation ou une diminution de la puissance acoustique à ces fréquences.
- very significant reduction in dynamic range,
- reduction of the overall performance of the enclosure,
- modification of the phase at the cut-off frequencies which results in an increase or a decrease in the sound power at these frequencies.
Par ailleurs, on connaît aussi les problèmes de disparités de timbre, inévitables entre les différents haut-parleurs qui nuisent à la vérité des sons reproduits.Furthermore, we also know the problems of timbre disparities, which are inevitable between the different speakers which harm the truth of the sounds reproduced.
D'autres désagréments ressortent d'enceintes classiques dont tous les haut-parleurs actifs sont montés sur le panneau frontal imposant ainsi à l'ensemble une directivité sonore contraignant l'auditeur à "situer" l'aire d'écoute optimale ou priviligiée, ce qui est incompatible avec le confort d'une audition naturelle, d'autant plus sensible dans le registre des fréquences graves.Other annoyances emerge from conventional speakers in which all the active speakers are mounted on the front panel thus imposing on the whole a sound directivity forcing the listener to "locate" the optimal or privileged listening area, this which is incompatible with the comfort of natural hearing, all the more sensitive in the low frequency register.
En outre, la forme généralement parallèlépipédique des enceintes à plusieurs voies impose à l'onde arrière du haut-parleur grave, fonctionnant en piston, une contrainte qui entraîne une déformation préjudiciable de l'onde avant, transmettant seule le message sonore. Naturellement cette contrainte sur l'onde arrière est plus ou moins importante selon le pouvoir d'absorption acoustique des parois ou le degré de sophistication des évents ou des chicanes destinés à affaiblir le retour de l'onde.In addition, the generally parallelepiped shape of the multi-way speakers imposes on the rear wave of the bass speaker, operating in piston, a constraint which causes a prejudicial deformation of the front wave, transmitting only the sound message. Naturally, this constraint on the rear wave is more or less important depending on the acoustic absorption power of the walls or the degree of sophistication of the vents or baffles intended to weaken the return of the wave.
Une autre conséquence de la forme prismatique des enceintes tient aux rebords de celles-ci sur lesquels les vibrations des haut-parleurs viennent se distordre, ruinant la plupart du temps le caractère omnidiretionnel des mêmes haut-parleurs.Another consequence of the prismatic shape of the speakers is due to the edges of these on which the vibrations of the speakers are distorted, ruining most of the time the omnidirectional character of the same speakers.
On peut noter enfin les classiques observations ou difficultés liées à une ébénisterie traditionnelle pour ce genre d'enceinte : étant généralement mal suspendue, l'enceinte entre fréquemment en résonnance et transmet des vibrations désagréables à l'environnement, ajoutant encore à l'aspect souvent inesthétique de leur caisse en bois, au poids et au coût réellement inacceptable.Finally, we can note the classic observations or difficulties associated with traditional cabinet making for this type of enclosure: being generally poorly suspended, the enclosure frequently enters into resonance and transmits unpleasant vibrations to the environment, often adding to the appearance unsightly of their wooden case, the weight and the cost really unacceptable.
Dans ce domaine des émetteurs ou transducteurs de son, les recherches ont, de tout temps, passionné amateurs et professionnels ; il n'est donc pas étonnant que de nombreuses solutions aient été proposées pour tenter de réduire les inconvénients cités en préambule.In this field of sound transmitters or transducers, research has always fascinated amateurs and professionals; it is therefore not surprising that many solutions have been proposed in an attempt to reduce the drawbacks mentioned in the preamble.
Pour réduire l'encombrement des enceintes, tout en conservant toutes les qualités requises en "haute fidélité", on a pensé, ainsi qu'il est indiqué dans le brevet FR-1- 330 932, remplacer l'unique membrane d'un haut-parleur par deux ou plusieurs membranes se déplaçant en phase dans le même sens et juxtaposées ; ainsi découple-t-on l'onde arrière de l'onde avant. Dans le Brevet FR-1- 510 260, on trouve des tentatives intéressantes pour limiter le "confinement du son" et surtout résoudre l'inacceptable caractère directionnel d'installation classique affectant gravement le diagramme des radiations acoustiques.To reduce the size of the speakers, while retaining all the qualities required for "high fidelity", it has been thought, as indicated in patent FR-1 330 932, to replace the single membrane of a high -speaker by two or more membranes moving in phase in the same direction and juxtaposed; so we decouple the rear wave from the front wave. In Patent FR-1- 510 260, there are interesting attempts to limit the "confinement of sound" and above all to resolve the unacceptable directional character of conventional installation seriously affecting the diagram of acoustic radiation.
D'autres propositions sont exposées notamment dans le brevet FR 2 338 616 pour remédier aux distorsions et résonnances créant des perturbations dans l'audition ; il est notamment proposé de remplacer les haut-parleurs frontaux par au moins deux haut-parleurs semblables, disposés en file les uns derrière les autres, dans un support commun, cylindriq ue ou non, dont l'extrémité avant est obturée par l'un des haut-parleurs et l'extrémité arrière par l'autre haut-parleur monté en phase acoustique, c'est-à-dire électriquement en série ou en parallèle selon la disposition de la membrane du haut-parleur arrière.Other proposals are set out in particular in
On sait maintenant que ce type de solution reste très partielle ; en effet, tous les inconvénients de directionnalité ou de fréquences de résonnance subsistent et sont même amplifiés par le couplage électrique des haut-parleurs avant et arrière, alors que les améliorations obtenue par ailleurs viennent grever le prix de l'installation.We now know that this type of solution remains very partial; indeed, all the drawbacks of directionality or resonant frequencies remain and are even amplified by the electrical coupling of the front and rear speakers, while the improvements obtained elsewhere are increasing the price of the installation.
Une amélioration à ces dernières propositions est apportée par le brevet US-A-3 978 941 qui décrit une enceinte acoustique en forme de tube cylindrique rigide maintenue verticalement, comportant un haut-parleur actif tourné vers le haut et monté à 15 centimètres de l'extrémité supérieure ouverte de ladite enceinte, l'extrémité inférieure dudit tube présentant une ouverture de passage qui permet le transfert de l'air de l'intérieur de la chambre à l'atmosphère extérieure. Du fait que le haut-parleur actif est enfermé dans le tube de l'enceinte, il apparaît des effets de bords ruinant l'omnidirectionnalité de la diffusion des sons médiums et aigus.An improvement to these latter proposals is made by patent US-A-3,978,941 which describes an acoustic enclosure in the form of a rigid cylindrical tube held vertically, comprising an active loudspeaker turned upwards and mounted 15 centimeters from the open upper end of said enclosure, the lower end of said tube having a passage opening which allows the transfer of air from inside the chamber to the outside atmosphere. Because the active speaker is enclosed in the speaker tube, edge effects appear, ruining the omnidirectionality of the diffusion of mid and treble sounds.
Une première solution à ce problème est apportée par le brevet GB-A-2 101 448 qui décrit un transducteur acoustique formé par un ensemble de chambres cylindriques comportant chacune dos à dos un haut-parleur actif et un haut-parleur passif, montés axialement à l'intérieur d'une enceinte rigide, et dont la longueur procure à chaque chambre une fréquence de résonance fondamentale particulière, l'ensemble des chambres pouvant ainsi reproduire la gamme à peu près complète des sons audibles.A first solution to this problem is provided by patent GB-A-2 101 448 which describes an acoustic transducer formed by a set of cylindrical chambers each comprising back to back an active speaker and a passive speaker, mounted axially at the interior of a rigid enclosure, the length of which gives each chamber a particular fundamental resonant frequency, all the chambers being able to reproduce the almost complete range of audible sounds.
La présente invention vise à améliorer les qualités de reproduction des sons du dispositif précédent, en proposant un transducteur plus simple, plus performant et présentant un étonnant rapport qualité-prix ainsi que d'excellentes capacités à s'intégrer dans l'environnement. Dans ce but, l'invention concerne un transducteur électro-acoustique constitué d'une enceinte en forme de révolution autour d'un axe dont chaque extrémité est obturée par un haut-parleur, les deux haut-parleurs étant montés dos à dos dans l'axe de l'enceinte, l'un des haut-parleurs est alimenté par une source d'énergie électrique et, en ce sens, il est dit actif, alors que l'autre haut-parleur est dit passif en ce qu'il ne reçoit aucune alimentation électrique, son mouvement résultant uniquement de l'onde arrière du haut-parleur actif, ce transducteur étant caractérisé en ce que :
- l'enceinte est maintenue verticalement suivant son axe de révolution,
- le haut-parleur actif est disposé au-dessus de l'enceinte,
- l'enveloppe de l'enceinte est constituée d'un matériau souple, connu en soi, insusceptible d'entrer en résonance avec les ondes avant ou arrière desdits haut-parleurs.
- the enclosure is held vertically along its axis of revolution,
- the active loudspeaker is arranged above the enclosure,
- the envelope of the enclosure is made of a flexible material, known per se, incapable of entering into resonance with the front or rear waves of said speakers.
L'emploi d'une matière souple pour le support des haut-parleurs évite toute résonnance pour l'onde arrière et toute diffraction pour l'onde avant. Naturellement, il importe peu que le support soit réalisé en tel ou tel matériau souple qui dépendra plus de critères d'économie ou d'esthétique : on peut, en effet, considérer tout aussi bien des supports en carton ondulé, qu'en fibre ou en matériau compact ou encore en cuir et même en matériau tissé.The use of a flexible material for the support of the speakers avoids any resonance for the rear wave and any diffraction for the front wave. Naturally, it does not matter that the support is made of such or such flexible material which will depend more on criteria of economy or esthetics: one can, indeed, consider just as well supports in corrugated cardboard, as in fiber or in compact material or in leather and even in woven material.
Suivant une caractéristique complémentaire de l'invention, le transducteur a avantageusement une forme cylindrique procurant une commodité de construction contribuant à l'économie du système ; cette forme particulière est, en outre, tout à fait adaptée à une autre particularité de l'invention préconisant d'utiliser deux haut-parleurs strictement identiques afin de n'introduire aucune source de distorsions d'origine purement mécanique. Enfin, la forme cylindrique de l'enceinte est idéale pour éviter les effets de bords bien connus dans les enceintes classiques et par conséquent éviter totalement la diffraction des sons.According to a complementary characteristic of the invention, the transducer advantageously has a cylindrical shape providing a construction convenience contributing to the economy of the system; this particular form is, moreover, entirely suited to another feature of the invention recommending the use of two strictly identical speakers in order to introduce no source of distortions of purely mechanical origin. Finally, the cylindrical shape of the speaker is ideal for avoiding the edge effects well known in conventional speakers and therefore totally avoiding diffraction of sounds.
Il est évident que d'autres combinaisons de transducteurs suivant l'invention peuvent être envisagées : on pourrait par exemple utiliser un haut-parleur passif de diamètre différent de celui du haut-parleur actif, ou encore, l'enceinte pourrait être tronconique, ou évasée d'un côté, en hyperboloïde de révolution etc... Tous les essais convergent néanmoins vers une solution optimale prévoyant un support cylindrique et des haut-parleurs semblables.It is obvious that other combinations of transducers according to the invention can be envisaged: one could for example use a passive speaker with a diameter different from that of the active speaker, or else, the enclosure could be frustoconical, or flared on one side, in hyperboloid of revolution etc ... All the tests nevertheless converge towards an optimal solution providing a cylindrical support and similar speakers.
Suivant une autre caractéristique complémentaire de l'invention ,le transducteur proposé doit être suspendu verticalement, le haut-parleur actif étant dirigé vers le haut et le haut-parleur passif vers le sol à une distance suffisante de celui-ci.According to another additional characteristic of the invention, the proposed transducer must be suspended vertically, the active loudspeaker being directed upwards and the passive loudspeaker towards the ground at a sufficient distance from the latter.
Naturellement, il sera préféré une suspension parfaitement insusceptible de transmettre des vibrations à l'environnement, utilisée avantageusement pour l'amenée des fils électriques. De cette manière, on réalise un transducteur électro-acoustique "total", idéalement chargé et parfaitement couplé avec la pièce d'écoute qui, de ce fait, intervient beaucoup moins qu'avec des enceintes classiques.Naturally, it will be preferred a perfectly insusceptible suspension to transmit vibrations to the environment, advantageously used for the supply of electric wires. In this way, a “total” electro-acoustic transducer is produced, ideally charged and perfectly coupled with the listening room, which therefore intervenes much less than with conventional speakers.
Enfin, on a su déterminer qu'en ce qui concerne les dimensions des transducters électro-acoustiques suivant l'invention, il existe une relation tendant à retenir, comme hauteur de l'enceinte, le double du diamètre moyen de la même enceinte et ce pour un volume interne donné.Finally, we have been able to determine that with regard to the dimensions of the electro-acoustic transducers according to the invention, there exists a relationship tending to retain, as the height of the enclosure, twice the average diameter of the same enclosure and this for a given internal volume.
On décrira ci-après, à titre d'exemple non limitatif, une forme d'exécution de la présente invention, en référence au dessin annexé qui est une vue en élévation, partiellement en coupe suivant son axe vertical, d'un transducteur électro-acoustique suivant l'invention.An embodiment of the present invention will be described below, by way of nonlimiting example, with reference to the appended drawing which is an elevational view, partially in section along its vertical axis, of an electro-transducer. acoustics according to the invention.
Conformément au dessin, le transducteur électro-acoustique suivant l'invention est constitué d'un premier haut-parleur "actif" 1, de diamètre extérieur égal a 21 cm et présentant, de façon connue en soi, toutes les dispositions électromécaniques autorisant une bande passante comprise entre 40 et 18 000 Hertz. Ce haut-parleur 1 est monté sur un disque 2 de diamètre égal à 25 cm. Ce disque est réalisé de préférence dans un panneau de 19 mm d'épaisseur consitué de copeaux de bois solidarisés par une résine époxy.According to the drawing, the electro-acoustic transducer according to the invention consists of a first "active"
Un deuxième haut-parleur "passif" semblable au premier haut-parleur 1 est également monté sur un disque 4 identique au disque 2.A second "passive" speaker similar to the
Les deux disques 2 et 4 qui sont centrés sur le même axe à une distance de 50 cm l'un de l'autre, reçoivent sur leur périphérie une feuille 5, en carton ondulé par exemple, venant s'enrouler sur les deux disques 2 et 4 auxquels elle est fixée par collage. Les cannelures de la feuille 5 sont disposées suivant une génératrice du cylindre 6 ainsi constitué.The two
A l'intérieur du cylindre 6, la paroi souple constituée par la feuille 5 est tapissée d'une épaisseur d'environ 5 cm de laine de roche ou d'ouate synthétique 7.Inside the
Le cylindre 6 est suspendu verticalement au moyen de deux cordons 8 solidaires du disque 2, venant s'accrocher sur un support 9 en forme de potence, de telle sorte que le haut-parleur "actif" 1 soit tourné vers le plafond. On alimente ce même haut-parleur 1 en utilisant avantageusement, par exemple, les cordons 8 pour l'amenée des fils électriques 8a depuis une source sonore quelconque.The
Le haut-parleur 3 n'est raccordé à aucune source et on le laisse libre de "travailler" sous les seules sollicitations de l'onde arrière du haut-parleur "actif" 1 contribuant de ce fait à son étouffement et donc au renforcement phonique de l'onde avant, avec laquelle il y a totale superposition, du moins pour le registre des fréquences graves.The
Le transducteur électro-acoustique, ainsi décrit et conforme à l'invention, est avantageusement décoré sur sa paroi latérale 10 de manière à mieux s'intégrer dans l'environnement. Ce même environnement détermine par ailleurs la hauteur optimale du haut-parleur "passif" 3, par rapport au sol, en considérant une hauteur minimale fixée à 30 cm, de manière qu'il y ait un couplage acoustique parfait entre le transducteur et l'environnement.The electro-acoustic transducer, thus described and in accordance with the invention, is advantageously decorated on its
Il ressort alors une écoute remarquable proche du son "total" donnant l'impression très inattendue d'une audition à l'"intérieur des instruments" et ce, quelle que soit la situation relative de l'auditeur par rapport aux transducteurs.A remarkable listening experience then comes close to the "total" sound, giving the very unexpected impression of hearing inside the "instruments", whatever the relative situation of the listener compared to the transducers.
Claims (7)
- Electro-acoustic transducer constituted by an enclosure in the form of revolution about an axis of which each end is obturated by a loud-speaker, the two loud-speakers being mounted back to back in the axis of the enclosure, one of the loud-speakers (1) is supplied by a source of electrical energy and, in that sense, it is called active, whilst the other loud-speaker (3) is called passive in that it receives no electrical supply, its movement resulting solely from the rear wave of the active loud-speaker (1), this transducer being characterized in that:- the enclosure (6) is maintained vertically along its axis of revolution,- the active loud-speaker (1) is disposed above the enclosure (6),- the envelope (5) of the enclosure (6) is constituted by a supple material, known per se, not capable of entering into resonance with the front or rear waves of said loud-speaker (1, 3).
- Electro-acoustic transducer according to Claim 1, characterized in that the enclosure (6) is suspended, by any means not capable of transmitting vibrations or of entering into resonance with the transducer, at a minimum height of about 30 cm from the ground.
- Electro-acoustic transducer according to either one of the preceding Claims, characterized in that the supple material constituting the envelope (5) of the enclosure (6) is made of corrugated cardboard of which the directions of the grooves follow the generatrices of the enclosure (6).
- Electro-acoustic transducer according to any one of the preceding Claims, characterized in that the two loud-speakers (1, 3) are fixed on rigid discs (2, 4) of simple or composite, acoustically very absorbent material, with diameter slightly greater than the diameter of each loud-speaker (1, 3), around which the supple material (5) of the enclosure (6) is wound.
- Electro-acoustic transducer according to any one of the preceding Claims, characterized in that the enclosure of revolution (6) is truncated.
- Electro-acoustic transducer according to any one of the preceding Claims, characterized in that the height of the enclosure (6) is substantially equal to double its mean diameter for the same volume of enclosure (6).
- Electro-acoustic transducer according to any one of the preceding Claims, characterized in that the active loud-speaker (1) is of the electro-dynamic type with wide pass band with a diameter at least equal to 21 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87402186T ATE88047T1 (en) | 1986-10-07 | 1987-10-01 | ELECTROACOUSTIC TRANSDUCER. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8613948 | 1986-10-07 | ||
| FR8613948A FR2604845B1 (en) | 1986-10-07 | 1986-10-07 | ELECTRO-ACOUSTIC TRANSDUCER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0263748A1 EP0263748A1 (en) | 1988-04-13 |
| EP0263748B1 true EP0263748B1 (en) | 1993-04-07 |
Family
ID=9339618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87402186A Expired - Lifetime EP0263748B1 (en) | 1986-10-07 | 1987-10-01 | Electro-acoustic transducer |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4905788A (en) |
| EP (1) | EP0263748B1 (en) |
| JP (1) | JP2726047B2 (en) |
| KR (1) | KR880005822A (en) |
| CN (1) | CN87107784A (en) |
| AT (1) | ATE88047T1 (en) |
| DE (1) | DE3785289T2 (en) |
| FR (1) | FR2604845B1 (en) |
| OA (1) | OA08763A (en) |
| RU (1) | RU1838895C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2261136B (en) * | 1990-06-08 | 1995-02-15 | Simon Paul Carrington | Loudspeaker with an oscillator having a coiled tubular chamber |
| US5664020A (en) * | 1994-01-18 | 1997-09-02 | Bsg Laboratories | Compact full-range loudspeaker system |
| US5450495A (en) * | 1994-01-18 | 1995-09-12 | Bsg Laboratories. Inc. | Loudspeaker system |
| DE10015751B4 (en) * | 1999-03-31 | 2005-11-17 | Matsushita Electric Industrial Co., Ltd., Kadoma | speaker |
| US6445806B1 (en) * | 2000-02-08 | 2002-09-03 | Michael L. Jacobson | Tuned elastic loudspeaker enclosure |
| US7347276B2 (en) * | 2004-08-23 | 2008-03-25 | Tci97 Inc. | Adjustable garden tool |
| US20070251759A1 (en) * | 2006-04-26 | 2007-11-01 | Eric Neiman | Bass speaker stand |
| LT5638B (en) | 2008-02-28 | 2010-02-25 | Gintautas Sruogis | Acoustic system |
| JP5449122B2 (en) * | 2010-01-02 | 2014-03-19 | ファイナル・オーディオデザイン事務所株式会社 | Drum air power system |
| DE102013009605B3 (en) * | 2013-06-07 | 2014-06-12 | Drazenko Sukalo | Speaker chassis for use in compact one-way or two-way loudspeaker systems, has band-shaped profile tightly bonded to membrane area along flow channel, where total area of band-shaped profile is seventy percentage of membrane area of chassis |
| CN111372162A (en) * | 2018-12-25 | 2020-07-03 | 深圳纽斯声学系统有限公司 | No-opening surface-mounted ultrathin ceiling sound box |
| CN109951778B (en) * | 2019-04-16 | 2020-12-01 | 陈国富 | Full frequency loudspeaker |
| GB2587412B (en) * | 2019-09-27 | 2021-10-13 | William Eikos Ltd | Sound projection apparatus |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3470976A (en) * | 1967-12-11 | 1969-10-07 | Procter Brevard | High fidelity speaker |
| US3750878A (en) * | 1971-11-15 | 1973-08-07 | Dixon K Corp | Electrical component testing apparatus |
| US3978941A (en) * | 1975-06-06 | 1976-09-07 | Curt August Siebert | Speaker enclosure |
| JPS5644148Y2 (en) * | 1976-01-19 | 1981-10-15 | ||
| US4169516A (en) * | 1976-04-26 | 1979-10-02 | Ichiro Honda | Speaker system |
| US4146744A (en) * | 1976-09-02 | 1979-03-27 | Bose Corporation | Low q multiple in phase high compliance driver ported loudspeaker enclosure |
| US4284844A (en) * | 1979-05-07 | 1981-08-18 | Belles Research Corp. | Loudspeaker system |
| JPS6019056Y2 (en) * | 1980-09-19 | 1985-06-08 | 川崎製鉄株式会社 | Material scattering prevention device for inclined conveyor |
| US4420061A (en) * | 1980-11-03 | 1983-12-13 | Michael Levy | Pentagonal speaker enclosure with a downward directed dynamic damping system |
| GB2101448B (en) * | 1981-06-02 | 1984-10-24 | Anthony Robert Taddeo | Speaker system |
| US4417714A (en) * | 1981-06-29 | 1983-11-29 | Orrin Charm | Hanging device mounting system for devices such as speaker enclosures |
| JPS58169786U (en) * | 1982-05-07 | 1983-11-12 | キ−プ工業株式会社 | public address system |
| US4673057A (en) * | 1984-11-13 | 1987-06-16 | Glassco John M | Geometrical transducer arrangements |
| US4580654A (en) * | 1985-03-04 | 1986-04-08 | Hale James W | Portable sound speaker system |
-
1986
- 1986-10-07 FR FR8613948A patent/FR2604845B1/en not_active Expired
-
1987
- 1987-10-01 AT AT87402186T patent/ATE88047T1/en not_active IP Right Cessation
- 1987-10-01 EP EP87402186A patent/EP0263748B1/en not_active Expired - Lifetime
- 1987-10-01 DE DE87402186T patent/DE3785289T2/en not_active Expired - Fee Related
- 1987-10-05 US US07/104,752 patent/US4905788A/en not_active Expired - Fee Related
- 1987-10-06 KR KR870011213A patent/KR880005822A/en not_active Application Discontinuation
- 1987-10-06 RU SU874203456A patent/RU1838895C/en active
- 1987-10-07 CN CN198787107784A patent/CN87107784A/en active Pending
- 1987-10-07 JP JP62251733A patent/JP2726047B2/en not_active Expired - Lifetime
- 1987-10-07 OA OA59205A patent/OA08763A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE88047T1 (en) | 1993-04-15 |
| JP2726047B2 (en) | 1998-03-11 |
| KR880005822A (en) | 1988-06-30 |
| OA08763A (en) | 1989-03-31 |
| US4905788A (en) | 1990-03-06 |
| JPS63160498A (en) | 1988-07-04 |
| FR2604845A1 (en) | 1988-04-08 |
| CN87107784A (en) | 1988-07-06 |
| FR2604845B1 (en) | 1989-06-16 |
| RU1838895C (en) | 1993-08-30 |
| DE3785289T2 (en) | 1993-11-11 |
| DE3785289D1 (en) | 1993-05-13 |
| EP0263748A1 (en) | 1988-04-13 |
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