EP0390626A1 - Sound reproduction unit - Google Patents

Sound reproduction unit Download PDF

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Publication number
EP0390626A1
EP0390626A1 EP90400574A EP90400574A EP0390626A1 EP 0390626 A1 EP0390626 A1 EP 0390626A1 EP 90400574 A EP90400574 A EP 90400574A EP 90400574 A EP90400574 A EP 90400574A EP 0390626 A1 EP0390626 A1 EP 0390626A1
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EP
European Patent Office
Prior art keywords
enclosure
auxiliary
loudspeaker
intermediate partition
conduit
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.)
Withdrawn
Application number
EP90400574A
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German (de)
French (fr)
Inventor
Jacques Morel
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Individual
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Individual
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Publication date
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Publication of EP0390626A1 publication Critical patent/EP0390626A1/en
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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 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
    • H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers
    • 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
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers

Definitions

  • the present invention relates to a sound reproduction assembly.
  • the acoustic energy In order for the transformation of electrical energy into acoustic energy carried out by such sound reproduction assemblies to be as faithful as possible, the acoustic energy must remain as constant as possible for a given electrical energy, in a frequency range from 30 Hz to 20 KHz.
  • an acoustic enclosure comprising two parts separated by an intermediate partition, a main speaker being placed opposite a orifice formed in a side wall of the first part of the enclosure and an auxiliary loudspeaker being disposed in this first part of the enclosure, opposite an orifice formed in the intermediate partition,
  • the second part of the enclosure includes a vent for placing the interior of this second part of the enclosure in communication with the outside and the loudspeakers are excited in phase opposition by the same source of electrical signals.
  • the object of the invention is therefore to solve the problems mentioned above by proposing a set of sound reproduction, which is reliable and faithful, in particular for low frequency signals, the structure of which is simple and easy to produce, and whose cost price is as low as possible.
  • the subject of the invention is a set of sound reproduction of the type comprising an acoustic enclosure comprising two parts separated by an intermediate partition, in the first part of which are arranged a main loudspeaker opposite an orifice. formed in a side wall of this first part and an auxiliary loudspeaker, opposite an orifice formed in the intermediate partition, said second part of the enclosure comprising a port for placing the interior of this second part in communication of the enclosure with the outside, said loudspeakers being excited in phase opposition by the same source of electrical signals, characterized in that a charging conduit for the auxiliary loudspeaker is provided between the orifice formed in the intermediate wall of the enclosure and the vent of the second part thereof, to put the signals emitted by the main and auxiliary speakers in phase, this conduit com bearing two portions of different section, the first, of smaller section, having a section approximately equal to that of the diaphragm of the auxiliary loudspeaker and is fixed to the intermediate partition of the enclosure opposite the auxiliary loudspeaker.
  • the second portion of the conduit has a cross section of 20 to 100% larger than that of the first portion thereof.
  • first and second portions of the conduit have approximately equal lengths, for example 0.5 m.
  • FIG. 1 which represents a first embodiment of a sound reproduction assembly according to the invention, this comprises an acoustic enclosure 1 comprising two parts 2 and 3, separated by an intermediate partition 4.
  • this acoustic enclosure In the first part 2 of this acoustic enclosure are arranged at least two speakers, namely a main speaker 5 disposed opposite an orifice 6 formed in a side wall of this first part of the enclosure, and a loud speaker auxiliary 7 disposed opposite an orifice 8 formed in the intermediate partition of this enclosure.
  • a third loudspeaker consisting for example of a TWEETER 9 type loudspeaker can also be placed in this first part of the enclosure.
  • these main 5 and auxiliary 7 speakers are active and are for example supplied in phase opposition by the same source of electrical signals, the corresponding supply terminals of these speakers being for example connected to opposite terminals of this source of electrical signals.
  • a conduit 10 for charging the auxiliary loudspeaker is provided between the orifice 8 of the intermediate partition 4 of the enclosure and a vent 11 for placing the interior of this second part of the enclosure in communication with the exterior.
  • this conduit comprises two portions of different section, the smaller section having a section roughly equal to that of the diaphragm of the auxiliary speaker 7 and is fixed to the intermediate partition. of the speaker next to this auxiliary speaker.
  • This charging conduit also allows the signals emitted by the main and auxiliary loudspeakers to be put back in phase.
  • this charging conduit comprises for example a charging tube 12 having a section approximately equal to that of the diaphragm of the loudspeaker 8 and one end of which is fixed to the intermediate partition 4 opposite this auxiliary loudspeaker .
  • This tube 12 has a length less than the height of the second part of the acoustic enclosure.
  • the internal wall of this tube forms a first portion 12a of the charging conduit, delimiting a first path of a first section for acoustic waves emitted by the membrane of the auxiliary loudspeaker through the orifice 8 formed in the intermediate partition 4 from the enclosure, toward the base of the enclosure.
  • the external wall of the tube 12 constitutes, with the internal wall of the enclosure, the second portion 12b of the charge conduit, this second portion having a section different from that of the first portion thereof and forming a second path for the waves acoustic from the base of the enclosure towards the vent 11
  • the second portion of the conduit may have a cross section of 20 to 100% greater than that of the first portion and that the first and second portions of this conduit advantageously have lengths approximately equal to and for example equal to 0.5 m.
  • the internal wall of the enclosure can be provided with means 13 absorbing the frequency signals for example greater than 150 Hz, these means being constituted for example by polyester foam.
  • this charge duct can have varied and different shapes and sections.
  • the vent 11 can also be arranged in a position other than that shown in FIG. 1 and the base of the enclosure can be provided with an acoustic signal deflector 14 disposed opposite the corresponding end of the tube, improving the transmission of these signals between the first and second portions of the charge conduit.
  • the auxiliary loudspeaker is a loudspeaker electrically excited by signals from a source.
  • this auxiliary speaker can also be constituted by a passive type speaker pneumatically excited by the main speaker.
  • FIG.2 there is shown schematically a second embodiment of this assembly.
  • This always includes an acoustic enclosure 20 in which are formed a first and a second parts 21 and 22 respectively.
  • a main speaker 23 and an auxiliary speaker 24 In the first part are arranged a main speaker 23 and an auxiliary speaker 24.
  • the main speaker is arranged opposite an orifice formed in a side wall of this first part while the auxiliary speaker is disposed opposite an orifice formed in an intermediate partition 25 delimiting the two parts of the enclosure.
  • a charging conduit for the auxiliary loudspeaker comprising a tube 26 is also provided in the second part 22 of the enclosure, this conduit comprising two portions of different sections, one of which 26a has a section roughly equal to that of the membrane of the auxiliary loudspeaker and extends from the orifice formed in the intermediate partition of this enclosure, in the direction of the base thereof.
  • the other portion 26b of this conduit extends between the base of the enclosure and a vent 27 formed therein.
  • a third embodiment can also be envisaged.
  • the sound reproduction assembly according to the invention always includes an acoustic enclosure 30 in which a first and a second part 31 and 32 are provided respectively.
  • Main 33 and auxiliary 34 speakers are arranged in the first part 31 of this enclosure.
  • the main loudspeaker 33 is disposed opposite an orifice formed in a side wall of this first part and the auxiliary loudspeaker is arranged opposite a orifice formed in an intermediate partition of this enclosure, this intermediate partition delimiting the two parts of the enclosure.
  • the charging duct is constituted by a tube 35 comprising a first portion 35a of section roughly equal to that of the membrane of the auxiliary loudspeaker and one end of which is connected to the intermediate partition of the enclosure. The other end of this first portion is connected to a second portion 35b of the tube 35, of larger section than that of the first portion. This second portion extends to a vent 36 of the enclosure.
  • the second portions of the conduits which have been described with reference to FIGS. 2 and 3, may comprise materials absorbing signals of frequency greater than 150 Hz as described above.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

This sound reproduction unit, containing an acoustic enclosure (1) comprising two parts (2,3) separated by an intermediate partition (4), in the first part of which are arranged a main loudspeaker (5) facing an orifice (6) of a lateral wall of this first part and an auxiliary loudspeaker (7), facing an orifice (8) of the intermediate partition of the enclosure, the second part (3) of the enclosure containing a vent (11) for placing the inside of the second part of the enclosure in communication with the outside, and the main (5) and auxiliary (7) loudspeakers being excited in phase opposition by a same signal source, is characterised in that a conduit (10) for loading the auxiliary loudspeaker (7) is provided between the orifice (8) of the intermediate partition and the vent (11), in order to place the signals emitted by the main and auxiliary loudspeakers back in phase, this conduit containing two portions (12a, 12b) of different cross-section, the first of which, of smaller cross-section, has a cross-section almost equal to that of the diaphragm of the auxiliary loudspeaker (7) and is fixed to the intermediate partition (4) of the enclosure facing the auxiliary loudspeaker. <IMAGE>

Description

La présente invention concerne un ensemble de reproduction de sons.The present invention relates to a sound reproduction assembly.

Pour que la transformation d'énergie élec­trique en énergie acoustique réalisée par de tels ensembles de reproduction de sons, soit la plus fidèle possible, il faut que l'énergie acoustique reste aussi constante que possible pour une énergie électrique déterminée, dans une gamme de fréquence de 30 Hz à 20 KHz.In order for the transformation of electrical energy into acoustic energy carried out by such sound reproduction assemblies to be as faithful as possible, the acoustic energy must remain as constant as possible for a given electrical energy, in a frequency range from 30 Hz to 20 KHz.

Or, si l'on n'éprouve pas trop de difficul­tés pour obtenir ce résultat pour les fréquences éle­vées, il en n'est pas de même pour les basses fréquen­ces et plus spécialement pour les fréquences inférieu­res à 100 Hz.However, if one does not experience too many difficulties to obtain this result for the high frequencies, it is not the same for the low frequencies and more especially for the frequencies lower than 100 Hz.

On a proposé dans l'état de la technique, un certain nombre de solutions permettant d'améliorer la réponse aux basses fréquences de ces ensembles.A number of solutions have been proposed in the state of the art which make it possible to improve the low frequency response of these sets.

Ainsi, on connait déjà dans l'état de la technique, par exemple par le document DE-A-2 837 520, une enceinte acoustique comportant deux parties sépa­rées par une cloison intermédiaire, un haut-parleur principal étant disposé en regard d'un orifice ménagé dans une paroi latérale de la première partie de l'enceinte et un haut-parleur auxiliaire étant disposé dans cette première partie de l'enceinte, en regard d'un orifice ménagé dans la cloison intermédiaire,Thus, we already know in the prior art, for example from document DE-A-2 837 520, an acoustic enclosure comprising two parts separated by an intermediate partition, a main speaker being placed opposite a orifice formed in a side wall of the first part of the enclosure and an auxiliary loudspeaker being disposed in this first part of the enclosure, opposite an orifice formed in the intermediate partition,

La seconde partie de l'enceinte comprend un évent de mise en communication de l'intérieur de cette seconde partie de l'enceinte avec l'extérieur et les haut-parleurs sont excités en opposition de phase par une même source de signaux électriques.The second part of the enclosure includes a vent for placing the interior of this second part of the enclosure in communication with the outside and the loudspeakers are excited in phase opposition by the same source of electrical signals.

Les documents US-A-3 688 373, 4 064 966, FR-A-2 304 237 et DE-A-3 214 226 décrivent également des perfectionnements apportés aux ensembles de re­ production de sons.Documents US-A-3,688,373, 4,064,966, FR-A-2,304,237 and DE-A-3,214,226 also describe improvements made to the re sound production.

Cependant, tous les ensembles connus présentent un certain nombre d'inconvénients, notam­ment au niveau de la qualité de reproduction des sons de basse fréquence, de la complexité de leur struc­ture, de leur encombrement et de leur prix de revient.However, all of the known assemblies have a certain number of drawbacks, in particular with regard to the quality of reproduction of low frequency sounds, the complexity of their structure, their size and their cost price.

Le but de l'invention est donc de résoudre les problèmes évoqués ci-dessus en proposant un en­semble de reproduction de sons, qui soit fiable et fidèle, en particulier pour les signaux de basse fréquence, dont la structure soit simple et facile à réaliser, et dont le prix de revient soit le plus faible possible.The object of the invention is therefore to solve the problems mentioned above by proposing a set of sound reproduction, which is reliable and faithful, in particular for low frequency signals, the structure of which is simple and easy to produce, and whose cost price is as low as possible.

A cet effet, l'invention a pour objet un ensemble de reproduction de sons du type comportant une enceinte acoustique comportant deux parties séparées par une cloison intermédiaire, dans la pre­mière partie de laquelle sont disposés un haut-parleur principal en regard d'un orifice ménagé dans une paroi latérale de cette première partie et un haut-parleur auxiliaire, en regard d'un orifice ménagé dans la cloison intermédiaire, ladite seconde partie de l'enceinte comportant un évent de mise en communi­cation de l'intérieur de cette seconde partie de l'enceinte avec l'extérieur, lesdits haut-parleurs étant excités en opposition de phase par une même source de signaux électriques, caractérisé en ce qu'un conduit de charge du haut-parleur auxiliaire est prévu entre l'orifice ménagé dans la paroi intermédiaire de l'enceinte et l'évent de la seconde partie de celle-­ci, pour remettre les signaux émis par les haut-par­leurs principal et auxiliaire en phase, ce conduit comportant deux portions de section différente dont la première, de plus petite section, présente une section à peu près égale à celle de la membrane du haut-parleur auxiliaire et est fixée sur la cloison intermédiaire de l'enceinte en regard du haut-parleur auxiliaire.To this end, the subject of the invention is a set of sound reproduction of the type comprising an acoustic enclosure comprising two parts separated by an intermediate partition, in the first part of which are arranged a main loudspeaker opposite an orifice. formed in a side wall of this first part and an auxiliary loudspeaker, opposite an orifice formed in the intermediate partition, said second part of the enclosure comprising a port for placing the interior of this second part in communication of the enclosure with the outside, said loudspeakers being excited in phase opposition by the same source of electrical signals, characterized in that a charging conduit for the auxiliary loudspeaker is provided between the orifice formed in the intermediate wall of the enclosure and the vent of the second part thereof, to put the signals emitted by the main and auxiliary speakers in phase, this conduit com bearing two portions of different section, the first, of smaller section, having a section approximately equal to that of the diaphragm of the auxiliary loudspeaker and is fixed to the intermediate partition of the enclosure opposite the auxiliary loudspeaker.

Avantageusement, la seconde portion du con­duit présente une section de 20 à 100% plus grande que celle de la première portion de celui-ci.Advantageously, the second portion of the conduit has a cross section of 20 to 100% larger than that of the first portion thereof.

Avantageusement également, les première et seconde portions du conduit présentent des longueurs à peu près égales, par exemple de 0,5 m.Advantageously also, the first and second portions of the conduit have approximately equal lengths, for example 0.5 m.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • - la Fig. 1 représente une vue en coupe d'un premier mode de réalisation d'un ensemble de reproduc­tion de sons selon l'invention;
  • - la Fig.2 représente une vue schématique en coupe d'un second mode de réalisation d'un ensemble de reproduction de sons selon l'invention; et
  • - la Fig.3 représente une vue schématique en coupe d'un troisième mode de réalisation d'un ensemble de reproduction de sons selon l'invention.
The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings, in which:
  • - Fig. 1 shows a sectional view of a first embodiment of a sound reproduction assembly according to the invention;
  • - Fig.2 shows a schematic sectional view of a second embodiment of a sound reproduction assembly according to the invention; and
  • - Fig.3 shows a schematic sectional view of a third embodiment of a sound reproduction assembly according to the invention.

Ainsi qu'on peut le voir sur la Fig. 1, qui représente un premier mode de réalisation d'un ensem­ble de reproduction de sons selon l'invention, celui-­ci comporte une enceinte acoustique 1 comportant deux parties 2 et 3, séparées par une cloison intermédiaire 4.As can be seen in FIG. 1, which represents a first embodiment of a sound reproduction assembly according to the invention, this comprises an acoustic enclosure 1 comprising two parts 2 and 3, separated by an intermediate partition 4.

Dans la première partie 2 de cette enceinte acoustique sont disposés au moins deux haut-parleurs, à savoir un haut-parleur principal 5 disposé en regard d'un orifice 6 ménagé dans une paroi latérale de cette première partie de l'enceinte, et un haut-parleur auxiliaire 7 disposé en regard d'un orifice 8 ménagé dans la cloison intermédiaire de cette enceinte.In the first part 2 of this acoustic enclosure are arranged at least two speakers, namely a main speaker 5 disposed opposite an orifice 6 formed in a side wall of this first part of the enclosure, and a loud speaker auxiliary 7 disposed opposite an orifice 8 formed in the intermediate partition of this enclosure.

Eventuellement, un troisième haut-parleur constitué par exemple par un haut-parleur du type TWEETER 9, peut également être disposé dans cette première partie de l'enceinte.Optionally, a third loudspeaker consisting for example of a TWEETER 9 type loudspeaker can also be placed in this first part of the enclosure.

Ainsi que cela est représenté sur cette figure, ces haut-parleurs principal 5 et auxiliaire 7, sont actifs et sont par exemple alimentés en opposi­tion de phase par une même source de signaux électri­ques, les bornes d'alimentation correspondantes de ces haut-parleurs étant par exemple raccordées à des bor­nes opposées de cette source de signaux électriques.As shown in this figure, these main 5 and auxiliary 7 speakers are active and are for example supplied in phase opposition by the same source of electrical signals, the corresponding supply terminals of these speakers being for example connected to opposite terminals of this source of electrical signals.

Un conduit 10 de charge du haut-parleur auxiliaire est prévu entre l'orifice 8 de la cloison intermédiaire 4 de l'enceinte et un évent 11 de mise en communication de l'intérieur de cette seconde par­tie de l'enceinte avec l'extérieur.A conduit 10 for charging the auxiliary loudspeaker is provided between the orifice 8 of the intermediate partition 4 of the enclosure and a vent 11 for placing the interior of this second part of the enclosure in communication with the exterior. .

Comme cela sera décrit plus en détail par la suite, ce conduit comporte deux portions de section différente dont celle de plus petite section présente une section à peu près égale à celle de la membrane du haut-parleur auxiliaire 7 et est fixée sur la cloison intermédiaire de l'enceinte en regard de ce haut-par­leur auxiliaire.As will be described in more detail below, this conduit comprises two portions of different section, the smaller section having a section roughly equal to that of the diaphragm of the auxiliary speaker 7 and is fixed to the intermediate partition. of the speaker next to this auxiliary speaker.

Ce conduit de charge permet en outre de remettre les signaux émis par les haut-parleurs prin­cipal et auxiliaire en phase.This charging conduit also allows the signals emitted by the main and auxiliary loudspeakers to be put back in phase.

Comme on peut le voir sur cette Fig. 1 , ce conduit de charge comprend par exemple un tube de charge 12 présentant une section à peu près égale à celle de la membrane du haut-parleur 8 et dont une extrémité est fixée sur la cloison intermédiaire 4 en regard de ce haut-parleur auxiliaire.As can be seen in this Fig. 1, this charging conduit comprises for example a charging tube 12 having a section approximately equal to that of the diaphragm of the loudspeaker 8 and one end of which is fixed to the intermediate partition 4 opposite this auxiliary loudspeaker .

Ce tube 12 présente une longueur inférieure à la hauteur de la seconde partie de l'enceinte acous­tique. La paroi interne de ce tube forme une première portion 12a du conduit de charge, délimitant un pre­mier trajet d'une première section pour des ondes acoustiques émises par la membrane du haut-parleur auxiliaire à travers l'orifice 8 ménagé dans la cloi­son intermédiaire 4 de l'enceinte, en direction de la base de l'enceinte.This tube 12 has a length less than the height of the second part of the acoustic enclosure. The internal wall of this tube forms a first portion 12a of the charging conduit, delimiting a first path of a first section for acoustic waves emitted by the membrane of the auxiliary loudspeaker through the orifice 8 formed in the intermediate partition 4 from the enclosure, toward the base of the enclosure.

La paroi externe du tube 12 constitue avec la paroi interne de l'enceinte, la seconde portion 12b du conduit de charge, cette seconde portion présentant une section différente de celle de la première portion de celui-ci et formant un second trajet pour les ondes acoustiques à partir de la base de l'enceinte en di­rection de l'évent 11The external wall of the tube 12 constitutes, with the internal wall of the enclosure, the second portion 12b of the charge conduit, this second portion having a section different from that of the first portion thereof and forming a second path for the waves acoustic from the base of the enclosure towards the vent 11

Il est à noter que la seconde portion du conduit peut présenter une section de 20 à 100% plus grande que celle de la première portion et que les première et seconde portions de ce conduit présentent avantageusement des longueurs à peu près égales et par exemple égales à 0,5 m. La paroi interne de l'en­ceinte peu être munie de moyens 13 absorbant les signaux de fréquence par exemple supérieure à 150 Hz, ces moyens étant constitués par exemple par de la mousse de polyester.It should be noted that the second portion of the conduit may have a cross section of 20 to 100% greater than that of the first portion and that the first and second portions of this conduit advantageously have lengths approximately equal to and for example equal to 0.5 m. The internal wall of the enclosure can be provided with means 13 absorbing the frequency signals for example greater than 150 Hz, these means being constituted for example by polyester foam.

Il va de soi que les portions de ce conduit de charge peuvent présenter des formes et des sections variées et différentes.It goes without saying that the portions of this charge duct can have varied and different shapes and sections.

L'évent 11 peut également être ménagé dans une autre position que celle représentée sur la Fig. 1 et la base de l'enceinte peut être munie d'un déflec­teur de signaux acoustiques 14 disposé en regard de l'extrémité correspondante du tube, améliorant la transmission de ces signaux entre les première et seconde portions du conduit de charge.The vent 11 can also be arranged in a position other than that shown in FIG. 1 and the base of the enclosure can be provided with an acoustic signal deflector 14 disposed opposite the corresponding end of the tube, improving the transmission of these signals between the first and second portions of the charge conduit.

Dans la description qui précède, le haut-parleur auxiliaire est un haut-parleur excité électriquement par des signaux émanant d'une source.In the above description, the auxiliary loudspeaker is a loudspeaker electrically excited by signals from a source.

Cependant, il va de soi que ce haut-parleur auxiliaire peut également être constitué par un haut-­parleur du type passif excité pneumatiquement par le haut-parleur principal.However, it goes without saying that this auxiliary speaker can also be constituted by a passive type speaker pneumatically excited by the main speaker.

D'autres modes de réalisation de cet ensem­ble de reproduction de sons selon l'invention peuvent également être envisagés.Other embodiments of this set of sound reproduction according to the invention can also be envisaged.

Par exemple sur la Fig.2, on a représenté schématiquement un second mode de réalisation de cet ensemble. Celui-ci comporte toujours une enceinte acoustique 20 dans laquelle sont ménagées une première et une seconde parties 21 et 22 respectivement.For example in Fig.2, there is shown schematically a second embodiment of this assembly. This always includes an acoustic enclosure 20 in which are formed a first and a second parts 21 and 22 respectively.

Dans la première partie sont disposés un haut-parleur principal 23 et un haut-parleur auxi­liaire 24. Le haut-parleur principal est disposé en regard d'un orifice ménagé dans une paroi latérale de cette première partie tandis que le haut-parleur auxiliaire est disposé en regard d'un orifice ménagé dans une cloison intermédiaire 25 délimitant les deux parties de l'enceinte.In the first part are arranged a main speaker 23 and an auxiliary speaker 24. The main speaker is arranged opposite an orifice formed in a side wall of this first part while the auxiliary speaker is disposed opposite an orifice formed in an intermediate partition 25 delimiting the two parts of the enclosure.

Un conduit de charge du haut-parleur auxi­liaire comprenant un tube 26 est également prévu dans la seconde partie 22 de l'enceinte, ce conduit compor­tant deux portions de sections différentes dont l'une 26a présente une section à peu près égale à celle de la membrane du haut-parleur auxiliaire et s'étend à partir de l'orifice ménagé dans la cloison intermé­diaire de cette enceinte, en direction de la base de celle-ci. L'autre portion 26b de ce conduit s'étend entre la base de l'enceinte et un évent 27 ménagé dans celle-ci.A charging conduit for the auxiliary loudspeaker comprising a tube 26 is also provided in the second part 22 of the enclosure, this conduit comprising two portions of different sections, one of which 26a has a section roughly equal to that of the membrane of the auxiliary loudspeaker and extends from the orifice formed in the intermediate partition of this enclosure, in the direction of the base thereof. The other portion 26b of this conduit extends between the base of the enclosure and a vent 27 formed therein.

Contrairement à ce qui est représenté sur la Fig. 1 dans laquelle le conduit de charge du haut-par­leur auxiliaire a été ménagé symétriquement par rap­port à l'axe de symétrie de l'enceinte, dans ce second mode de réalisation représenté sur la Fig.2, la pre­mière portion 26a de ce conduit de charge est décalée vers la face arrière de l'enceinte, la seconde portion 26b de celui-ci étant disposée vers la face avant de cette enceinte.Contrary to what is shown in FIG. 1 in which the load channel of the auxiliary loudspeaker has been formed symmetrically with respect to the axis of symmetry of the enclosure, in this second embodiment shown in FIG. 2, the first portion 26a of this conduit of load is shifted towards the rear face of the enclosure, the second portion 26b thereof being disposed towards the front face of this enclosure.

Un troisième mode de réalisation peut égale­ment être envisagé.A third embodiment can also be envisaged.

Dans ce troisième mode de réalisation repré­senté sur la Fig.3, l'ensemble de reproduction de sons selon l'invention comporte toujours une enceinte acoustique 30 dans laquelle sont prévues une première et une seconde parties 31 et 32 respectivement.In this third embodiment shown in FIG. 3, the sound reproduction assembly according to the invention always includes an acoustic enclosure 30 in which a first and a second part 31 and 32 are provided respectively.

Des haut-parleurs principal 33 et auxiliaire 34 sont disposés dans la première partie 31 de cette enceinte.Main 33 and auxiliary 34 speakers are arranged in the first part 31 of this enclosure.

Comme décrit précédemment, le haut-parleur principal 33 est disposé en regard d'un orifice ménagé dans une paroi latérale de cette première partie et le haut-parleur auxiliaire est disposé en regard d'un orifice ménagé dans une cloison intermédiaire de cette enceinte, cette cloison intermédiaire délimitant les deux parties de l'enceinte. Le conduit de charge est constitué par un tube 35 comportant une première portion 35a de section à peu près égale à celle de la membrane du haut-parleur auxiliaire et dont une extrémité est reliée à la cloison intermédiaire de l'enceinte. L'autre extrémité de cette première portion est reliée à une seconde portion 35b du tube 35, de section plus grande que celle de la première portion. Cette seconde portion s'étend jusqu'à un évent 36 de l'enceinte.As described above, the main loudspeaker 33 is disposed opposite an orifice formed in a side wall of this first part and the auxiliary loudspeaker is arranged opposite a orifice formed in an intermediate partition of this enclosure, this intermediate partition delimiting the two parts of the enclosure. The charging duct is constituted by a tube 35 comprising a first portion 35a of section roughly equal to that of the membrane of the auxiliary loudspeaker and one end of which is connected to the intermediate partition of the enclosure. The other end of this first portion is connected to a second portion 35b of the tube 35, of larger section than that of the first portion. This second portion extends to a vent 36 of the enclosure.

Il va de soi que les secondes portions des conduits qui ont été décrits en regard des Fig.2 et 3, peuvent comporter des matériaux absorbants des signaux de fréquence supérieure à 150 Hz comme décrit précé­demment.It goes without saying that the second portions of the conduits which have been described with reference to FIGS. 2 and 3, may comprise materials absorbing signals of frequency greater than 150 Hz as described above.

Claims (10)

1. Ensemble de reproduction de sons, du type comportant une enceinte acoustique (1;20;30) compor­tant deux parties (2,3; 21,22; 31,32) séparées par une cloison intermédiaire (4;25), dans la première partie de laquelle sont disposés un haut-parleur principal (5;23; 33) en regard d'un orifice (6) ménagé dans une paroi latérale de cette première partie et un haut-­parleur auxiliaire (7;24;34), en regard d'un orifice (8) ménagé dans la cloison intermédiaire de l'encein­te, la seconde partie (3;22;32) de l'enceinte compor­tant un évent (11;27;36) de mise en communication de l'intérieur de la seconde partie de l'enceinte avec l'extérieur, les haut-parleurs principal (5; 23;33) et auxiliaire (7;24;34) étant excités en opposition de phase par une même source de signaux électriques, caractérisé en ce qu'un conduit (10;26;35) de charge du haut-parleur auxiliaire (7; 24; 34) est prévu entre l'orifice (8) de la cloison intermédiaire et l'évent (11;27;36) de la seconde partie de l'enceinte, pour remettre les signaux émis par les haut-parleurs prin­cipal et auxiliaire en phase, ce conduit comportant deux portions (12a,12b; 26a,26b; 35a,35b) de section différente dont la première, de plus petite section, présente une section à peu près égale à celle de la membrane du haut-parleur auxiliaire (7;24;34) et est fixée sur la cloison intermédiaire (4) de l'enceinte en regard du haut-parleur auxiliaire.1. Sound reproduction assembly, of the type comprising an acoustic enclosure (1; 20; 30) comprising two parts (2,3; 21,22; 31,32) separated by an intermediate partition (4; 25), in the first part of which are arranged a main speaker (5; 23; 33) opposite an orifice (6) formed in a side wall of this first part and an auxiliary speaker (7; 24; 34), next to an orifice (8) formed in the intermediate partition of the enclosure, the second part (3; 22; 32) of the enclosure comprising a vent (11; 27; 36) for connecting the inside the second part of the enclosure with the outside, the main (5; 23; 33) and auxiliary (7; 24; 34) loudspeakers being excited in phase opposition by the same source of electrical signals, characterized in that a conduit (10; 26; 35) for charging the auxiliary loudspeaker (7; 24; 34) is provided between the orifice (8) of the intermediate partition and the vent (11; 27; 36 ) of the second p part of the enclosure, to put the signals emitted by the main and auxiliary loudspeakers in phase, this conduit comprising two portions (12a, 12b; 26a, 26b; 35a, 35b) of different section, the first, of smaller section, having a section roughly equal to that of the diaphragm of the auxiliary speaker (7; 24; 34) and is fixed to the intermediate partition (4) of the speaker next to the auxiliary speaker. 2. Ensemble selon la revendication 1, carac­térisé en ce que la seconde portion (12b; 26b; 35b) du conduit présente une section de 20 à 100% plus grande que celle de la première portion de celui-ci.2. Assembly according to claim 1, characterized in that the second portion (12b; 26b; 35b) of the duct has a cross section of 20 to 100% larger than that of the first portion thereof. 3. Ensemble selon la revendication 1 ou 2, caractérisé en ce que les première et seconde portions du conduit présentent des longueurs à peu près égales.3. Assembly according to claim 1 or 2, characterized in that the first and second portions of the duct have approximately equal lengths. 4. Ensemble selon la revendication 3, carac­térisé en ce que la longueur des portions est à peu près égale à 0,5 m.4. An assembly according to claim 3, characterized in that the length of the portions is approximately equal to 0.5 m. 5. En semble selon l'une quelconque des re­vendications précédentes, caractérisé en ce que le conduit de charge du haut-parleur auxiliaire comprend un tube (12;26) présentant une longueur inférieure à la hauteur de la seconde partie de l'enceinte et dont la paroi interne délimite un premier trajet (12a; 26a) de la première section, s'étendant de l'orifice (8) de la cloison intermédiaire en direction de la base de l'enceinte et dont la paroi externe délimite avec la paroi interne de l'enceinte un second trajet (12b; 26b) de la seconde section, s'étendant de la base de l'enceinte en direction de l'évent (11;27)5. Apparently according to any one of the preceding claims, characterized in that the charging channel of the auxiliary loudspeaker comprises a tube (12; 26) having a length less than the height of the second part of the enclosure and the internal wall of which delimits a first path (12a; 26a) of the first section, extending from the orifice (8) of the intermediate partition in the direction of the base of the enclosure and the external wall of which delimits with the wall inside the enclosure a second path (12b; 26b) of the second section, extending from the base of the enclosure towards the vent (11; 27) 6. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que le haut-parleur auxiliaire est un haut-parleur passif, excité pneumatiquement par les signaux émanant du haut-parleur principal.6. Assembly according to any one of the preceding claims, characterized in that the auxiliary loudspeaker is a passive loudspeaker, pneumatically excited by the signals emanating from the main loudspeaker. 7. Ensemble selon l'une quelconque des re­vendications 1 à 5, caractérisé en ce que le haut-­parleur auxiliaire est un haut-parleur actif, ali­menté en opposition de phase par la même source de signaux que le haut-parleur principal.7. Assembly according to any one of claims 1 to 5, characterized in that the auxiliary loudspeaker is an active loudspeaker, supplied in phase opposition by the same signal source as the main loudspeaker. 8. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce que la seconde portion du conduit comporte un revêtement (13) en matériau absorbant les signaux de fréquence supé­rieure à 150 Hz.8. Assembly according to any one of the preceding claims, characterized in that the second portion of the conduit comprises a coating (13) made of material absorbing the signals of frequency greater than 150 Hz. 9. Ensemble selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un déflecteur de signaux (14) est disposé à l'extrémité de la première portion du conduit, de manière à amé­liorer la transmission des signaux acoustiques de la première à la seconde portion du conduit.9. Assembly according to any one of the preceding claims, characterized in that a signal deflector (14) is arranged at the end from the first portion of the conduit, so as to improve the transmission of acoustic signals from the first to the second portion of the conduit. 10. Ensemble selon l'une quelconque des revendications 1,2,3,4,6,7 ou 8, caractérisé en ce que les première et seconde portions du conduit de charge du haut-parleur auxiliaire sont constituées par des première et seconde portions (35a,35b) d'un tube (35), ces portions étant ménagées dans le prolongement l'une de l'autre, ce tube s'étendant entre l'orifice ménagé dans la cloison intermédiaire en regard du haut-par­leur auxiliaire (34) et l'évent (36) de la seconde partie de l'enceinte acoustique (30)10. An assembly according to any one of claims 1,2,3,4,6,7 or 8, characterized in that the first and second portions of the load conduit of the auxiliary loudspeaker are constituted by first and second portions (35a, 35b) of a tube (35), these portions being formed in the extension of one another, this tube extending between the orifice formed in the intermediate partition opposite the auxiliary loudspeaker ( 34) and the vent (36) of the second part of the acoustic enclosure (30)
EP90400574A 1989-03-28 1990-03-01 Sound reproduction unit Withdrawn EP0390626A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904004 1989-03-28
FR8904004A FR2645386B1 (en) 1989-03-28 1989-03-28 IMPROVED SOUND REPRODUCTION ASSEMBLY

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EP0390626A1 true EP0390626A1 (en) 1990-10-03

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EP (1) EP0390626A1 (en)
FR (1) FR2645386B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256344A (en) * 1991-05-29 1992-12-02 Hughes Aircraft Co High mass low resonance speaker system
GB2288514A (en) * 1993-10-16 1995-10-18 Jozef Szczepanski A horn stand for loudspeakers
WO1998024268A1 (en) * 1996-11-25 1998-06-04 Excel Sound & Art Speaker system
WO2008056258A2 (en) * 2006-11-10 2008-05-15 Pss Belgium Nv Loudspeaker system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064966A (en) * 1976-03-11 1977-12-27 Burton William D Loudspeaker apparatus
FR2361032A1 (en) * 1976-08-06 1978-03-03 Elipson Loudspeaker cabinet with dual speaker - has first speaker in upper section of vertical front wall, and second speaker in internal horizontal dividing partition
US4325454A (en) * 1980-09-29 1982-04-20 Humphrey Theodore J Speaker system which inverts and redirects the speaker backwave
FR2505125A1 (en) * 1981-04-30 1982-11-05 Lemonne Denis Loudspeaker casing with baffles holding two units - has closed, common cavity and open tuned cavity transmitting low frequency tones
FR2579852A1 (en) * 1985-03-28 1986-10-03 Jacquet Castellano Patrice High-efficiency acoustic enclosure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064966A (en) * 1976-03-11 1977-12-27 Burton William D Loudspeaker apparatus
FR2361032A1 (en) * 1976-08-06 1978-03-03 Elipson Loudspeaker cabinet with dual speaker - has first speaker in upper section of vertical front wall, and second speaker in internal horizontal dividing partition
US4325454A (en) * 1980-09-29 1982-04-20 Humphrey Theodore J Speaker system which inverts and redirects the speaker backwave
FR2505125A1 (en) * 1981-04-30 1982-11-05 Lemonne Denis Loudspeaker casing with baffles holding two units - has closed, common cavity and open tuned cavity transmitting low frequency tones
FR2579852A1 (en) * 1985-03-28 1986-10-03 Jacquet Castellano Patrice High-efficiency acoustic enclosure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256344A (en) * 1991-05-29 1992-12-02 Hughes Aircraft Co High mass low resonance speaker system
GB2288514A (en) * 1993-10-16 1995-10-18 Jozef Szczepanski A horn stand for loudspeakers
GB2288514B (en) * 1993-10-16 1998-04-29 Jozef Szczepanski A horn stand for Loudspeakers for precision sound radiation
WO1998024268A1 (en) * 1996-11-25 1998-06-04 Excel Sound & Art Speaker system
WO2008056258A2 (en) * 2006-11-10 2008-05-15 Pss Belgium Nv Loudspeaker system
WO2008056258A3 (en) * 2006-11-10 2008-07-03 Pss Belgium Nv Loudspeaker system

Also Published As

Publication number Publication date
FR2645386A1 (en) 1990-10-05
FR2645386B1 (en) 1991-06-21

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