EP1368987A1 - Enclosure and audio-visual apparatus comprising same - Google Patents
Enclosure and audio-visual apparatus comprising sameInfo
- Publication number
- EP1368987A1 EP1368987A1 EP02700340A EP02700340A EP1368987A1 EP 1368987 A1 EP1368987 A1 EP 1368987A1 EP 02700340 A EP02700340 A EP 02700340A EP 02700340 A EP02700340 A EP 02700340A EP 1368987 A1 EP1368987 A1 EP 1368987A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- enclosure
- vent
- resonance frequency
- reflex
- bass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000011514 reflex Effects 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 4
- 230000004044 response Effects 0.000 description 8
- 239000004793 Polystyrene Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
- H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
Definitions
- the present invention relates to loudspeakers and audiovisual devices comprising such a speaker.
- a vent with an acoustic enclosure comprising at least one electro-acoustic transducer, such as a loudspeaker, mounted in a box.
- an enclosure is generally called a bass-reflex enclosure or a ventilated enclosure.
- the assembly formed by the volume of the box and the vent reacts to the vibratory excitations of the loudspeaker like an oscillating system (Helmholtz resonator), with a resonance frequency F 0 called the resonance frequency of the bass-reflex.
- the frequency response of the bass-reflex speaker can thus be adapted to the desired use.
- the use of a bass-reflex enclosure is notably known in audiovisual devices, such as televisions, as described for example in the utility model JP 63-183 788.
- FIG. 1 An example of frequency responses in the case of an enclosure without vent (dotted line) and with vent (solid line) is given in FIG. 1 where the resonance peak F 0 clearly appears in the case of the enclosure with vent.
- the vent comprises means of attenuation at the resonance frequency of the bass-reflex.
- the vent comprises at least one flexible plate
- the vent comprises at least one plate whose mechanical resonance frequency is close to the resonance of the bass reflex;
- the vent comprises at least one plate whose mechanical resonance frequency is practically equal to the resonance of the bass reflex; -
- the vent comprises two flexible plates which define a vent volume opening into an opening of the box; - the electro-acoustic transducer is a hard suspension speaker.
- the invention also provides an audiovisual device which includes a display device and such an enclosure.
- FIG. 2 shows an acoustic enclosure produced in accordance with the teachings of the invention
- FIG. 3 represents the frequency response of the acoustic enclosure of FIG. 2 compared to the frequency responses of FIG. 1.
- the enclosure 2 shown in FIG. 2 comprises four speakers 4 mounted on the front face 6 of a parallelepipedal box 8, the walls of which are made of wood.
- the speakers 4 are aligned on the front face 6 of the box 8 in a general direction Y.
- the box has an upper face 10 and a lower face 12 parallel to each other and each perpendicular to the direction Y.
- the box also has a face rear 7 parallel to the front face and two lateral faces 14.
- the speakers are of the Odyssey 1 type with foam suspension.
- the dimensions of the box 8 in the example studied are as follows: height 250 mm (between upper face 10 and lower face 12); width 43 mm (between side faces 14); depth 55 mm (between front face 6 and rear face 7).
- the enclosure 2 also includes a vent 16 consisting of a rectangular opening 18 in the front face 6 as well as an upper plate 20 and a lower plate 22 parallel to the upper 10 and lower faces 12.
- the opening 18 n ' is not necessarily rectangular; it could alternatively be oblong.
- the lower 22 and upper 20 plates do not extend over the entire depth of the box 8 (that is to say that their surface is less than that of the lower 12 and upper 10 faces). In the example, they extend over 40 mm.
- the plates can have different lengths from one another. They are not necessarily rectangular or perfectly flat.
- the bottom plates
- the lower 22 and upper 20 are spaced 5 mm apart and thus define between them a vent volume which opens on the one hand to the outside of the box 8 through the opening 18 and on the other hand to the inside of the caisson.
- the lower 22 and upper 20 plates extend over the entire width of the front face so that the vent volume is also delimited by the lateral faces 14.
- Such an assembly constitutes a bass-reflex enclosure 2 having a resonance frequency F 0 of 155 Hz.
- the lower 22 and upper 20 plates each have a rigidity less than the walls of the box 8. In the example studied, the plates
- PS - Hl impact polystyrene
- These plates 20, 22 behave like flexible vibrating plates and are designed so that their mechanical resonance frequency F M is close to the resonance frequency F 0 of the bass-reflex enclosure 2.
- the plates 20, 22 have a mechanical resonance frequency F M of 153 Hz.
- D is the stiffness factor of the plate defined as follows
- the plates 20, 22 achieve an attenuation and limit the influence of the vent around the resonance frequency of the bass -reflex F 0 , without changing its value, by partially absorbing vibrations whose frequency is close to the mechanical resonance frequency F M.
- the bass-reflex 2 speaker therefore has an acoustic response (bold solid line) improved at low frequency compared to a ventless box (dotted line), without however presenting the peak of resonance too sharp a classic bass-reflex enclosure (thin solid line).
- only one of the plates can be produced with a rigidity lower than the walls of the box 8, the other plate being for example produced in an identical manner to the walls of the box.
- the dimensioning of the lower rigidity plate will then be designed so that the vent constitutes a mechanical system having a mechanical resonance frequency F M close to the resonance frequency of the bass reflex F 0 and thus achieves a means of attenuation around the resonance frequency of the bass reflex, and therefore in particular the resonance frequency of the bass reflex.
- the mechanical resonant frequency is very close to (substantially equal to) the resonant frequency of the bass reflex. It is important to note, however, that the invention is not limited to this specific case but consists in providing attenuation means which notably cover the resonance frequency of the bass-reflex.
- the cut-off frequency at -3 dB can be considered as close to the resonant frequency.
Landscapes
- 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)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Enceinte acoustique et appareil audiovisuel comportant une telle enceinte Acoustic enclosure and audiovisual device comprising such an enclosure
La présente invention concerne les enceintes acoustiques et les appareils audiovisuels comportant une telle enceinte.The present invention relates to loudspeakers and audiovisual devices comprising such a speaker.
Il est connu de pourvoir d'un évent une enceinte acoustique comportant au moins un transducteur électro-acoustique, tel qu'un haut- parleur, monté dans un caisson. Une telle enceinte est généralement dénommée enceinte bass-reflex ou enceinte ventilée. L'ensemble constitué par le volume du caisson et l'évent réagit aux excitations vibratoires du haut- parleur comme un système oscillant (résonateur de Helmholtz), avec une fréquence de résonance F0 dite fréquence de résonance du bass-reflex. La réponse fréquentielle de l'enceinte bass-reflex peut ainsi être adaptée à l'utilisation souhaitée. L'utilisation d'une enceinte bass-reflex est notamment connue dans les appareils audiovisuels, tels que les téléviseurs, comme décrit par exemple dans le modèle d'utilité JP 63-183 788.It is known to provide a vent with an acoustic enclosure comprising at least one electro-acoustic transducer, such as a loudspeaker, mounted in a box. Such an enclosure is generally called a bass-reflex enclosure or a ventilated enclosure. The assembly formed by the volume of the box and the vent reacts to the vibratory excitations of the loudspeaker like an oscillating system (Helmholtz resonator), with a resonance frequency F 0 called the resonance frequency of the bass-reflex. The frequency response of the bass-reflex speaker can thus be adapted to the desired use. The use of a bass-reflex enclosure is notably known in audiovisual devices, such as televisions, as described for example in the utility model JP 63-183 788.
Un exemple de réponses fréquentielles dans les cas d'une enceinte sans évent (trait pointillé) et avec évent (trait continu) est donné à la figure 1 où apparaît clairement le pic de résonance F0 dans le cas de l'enceinte avec évent.An example of frequency responses in the case of an enclosure without vent (dotted line) and with vent (solid line) is given in FIG. 1 where the resonance peak F 0 clearly appears in the case of the enclosure with vent.
L'inventeur a remarqué que, dans certaines applications, notamment lorsqu'on utilise des haut-parleurs à suspension dure (en mousse ou papier par exemple), le pic de résonance pouvait être trop marqué alors qu'une réponse la plus plate possible est en général souhaitable.The inventor noticed that, in certain applications, in particular when using speakers with hard suspension (in foam or paper for example), the resonance peak could be too marked while a response as flatter as possible is generally desirable.
Afin d'améliorer la réponse acoustique de l'enceinte bass-reflex, l'inventeur propose ainsi que l'évent comporte des moyens d'atténuation à la fréquence de résonance du bass-reflex.In order to improve the acoustic response of the bass-reflex enclosure, the inventor thus proposes that the vent comprises means of attenuation at the resonance frequency of the bass-reflex.
Selon d' autres caractéristiques avantageuses, - l'évent comporte au moins une plaque souple ;According to other advantageous characteristics, - the vent comprises at least one flexible plate;
- l'évent comporte au moins une plaque dont la fréquence de résonance mécanique est proche de la résonance du bass-reflex ;- The vent comprises at least one plate whose mechanical resonance frequency is close to the resonance of the bass reflex;
- l'évent comporte au moins une plaque dont la fréquence de résonance mécanique est pratiquement égale à la résonance du bass-reflex ; - l'évent comporte deux plaques souples qui définissent un volume d'évent débouchant dans une ouverture du caisson ; - le transducteur électro-acoustique est un haut-parleur à suspension dure.- The vent comprises at least one plate whose mechanical resonance frequency is practically equal to the resonance of the bass reflex; - The vent comprises two flexible plates which define a vent volume opening into an opening of the box; - the electro-acoustic transducer is a hard suspension speaker.
L'invention propose également un appareil audiovisuel qui comporte un dispositif d'affichage et une telle enceinte. La description qui suit sera faite en référence aux dessins annexés dans lesquels :The invention also provides an audiovisual device which includes a display device and such an enclosure. The following description will be made with reference to the accompanying drawings in which:
- la figure 1 représente les réponses fréquentielles de systèmes connus, comme déjà expliqué ci-dessus ;- Figure 1 shows the frequency responses of known systems, as already explained above;
- la figure 2 représente une enceinte acoustique réalisée conformément aux enseignements de l'invention ;- Figure 2 shows an acoustic enclosure produced in accordance with the teachings of the invention;
- la figure 3 représente la réponse fréquentielle de l'enceinte acoustique de la figure 2 comparée aux réponses fréquentielles de la figure 1.FIG. 3 represents the frequency response of the acoustic enclosure of FIG. 2 compared to the frequency responses of FIG. 1.
L'enceinte 2 représentée à la figure 2 comporte quatre haut- parleurs 4 montés sur la face avant 6 d'un caisson 8 parallelepipedique dont les parois sont réalisées en bois. Les haut-parleurs 4 sont alignés sur la face avant 6 du caisson 8 selon une direction générale Y. Le caisson possède une face supérieure 10 et une face inférieure 12 parallèles entre elles et chacune perpendiculaire à la direction Y. Le caisson comporte également une face arrière 7 parallèle à la face avant et deux faces latérales 14.The enclosure 2 shown in FIG. 2 comprises four speakers 4 mounted on the front face 6 of a parallelepipedal box 8, the walls of which are made of wood. The speakers 4 are aligned on the front face 6 of the box 8 in a general direction Y. The box has an upper face 10 and a lower face 12 parallel to each other and each perpendicular to the direction Y. The box also has a face rear 7 parallel to the front face and two lateral faces 14.
Les haut-parleurs sont du type Odyssey 1 avec suspension en mousse.The speakers are of the Odyssey 1 type with foam suspension.
Les dimensions du caisson 8 dans l'exemple étudié sont les suivantes : hauteur 250 mm (entre face supérieure 10 et face inférieure 12) ; largeur 43 mm (entre faces latérales 14) ; profondeur 55 mm (entre face avant 6 et face arrière 7).The dimensions of the box 8 in the example studied are as follows: height 250 mm (between upper face 10 and lower face 12); width 43 mm (between side faces 14); depth 55 mm (between front face 6 and rear face 7).
L'enceinte 2 comporte également un évent 16 constitué d'une ouverture 18 rectangulaire dans la face avant 6 ainsi que d'une plaque supérieure 20 et d'une plaque inférieure 22 parallèles aux faces supérieure 10 et inférieure 12. L'ouverture 18 n'est pas nécessairement rectangulaire ; elle pourrait en variante être oblongue.The enclosure 2 also includes a vent 16 consisting of a rectangular opening 18 in the front face 6 as well as an upper plate 20 and a lower plate 22 parallel to the upper 10 and lower faces 12. The opening 18 n 'is not necessarily rectangular; it could alternatively be oblong.
Les plaques inférieure 22 et supérieure 20 ne s'étendent pas sur toute la profondeur du caisson 8 (c'est-à-dire que leur surface est inférieure à celle des faces inférieure 12 et supérieure 10). Dans l'exemple, elle s'étendent sur 40 mm. Bien sûr, en variante, les plaques peuvent avoir des longueurs différentes l'une de l'autre. Elles ne sont d'ailleurs pas nécessairement rectangulaires ni parfaitement planes. Les plaques inférieureThe lower 22 and upper 20 plates do not extend over the entire depth of the box 8 (that is to say that their surface is less than that of the lower 12 and upper 10 faces). In the example, they extend over 40 mm. Of course, as a variant, the plates can have different lengths from one another. They are not necessarily rectangular or perfectly flat. The bottom plates
22 et supérieure 20 sont espacées de 5 mm et définissent ainsi entre elles un volume d'évent qui s'ouvre d'une part sur l'extérieur du caisson 8 à travers l'ouverture 18 et d'autre part sur l'intérieur du caisson. Les plaques inférieure 22 et supérieure 20 s'étendent sur toute la largeur de la face avant de telle sorte que le volume d'évent est également délimité par les faces latérales 14.22 and upper 20 are spaced 5 mm apart and thus define between them a vent volume which opens on the one hand to the outside of the box 8 through the opening 18 and on the other hand to the inside of the caisson. The lower 22 and upper 20 plates extend over the entire width of the front face so that the vent volume is also delimited by the lateral faces 14.
Un tel ensemble constitue une enceinte bass-reflex 2 ayant une fréquence de résonance F0 de 155 Hz. Les plaques inférieure 22 et supérieure 20 ont chacune une rigidité inférieure aux parois du caisson 8. Dans l'exemple étudié, les plaquesSuch an assembly constitutes a bass-reflex enclosure 2 having a resonance frequency F 0 of 155 Hz. The lower 22 and upper 20 plates each have a rigidity less than the walls of the box 8. In the example studied, the plates
20, 22 sont réalisées en PS - Hl (polystyrène choc) d'épaisseur 0,17 mm.20, 22 are made of PS - Hl (impact polystyrene) 0.17 mm thick.
Ces plaques 20, 22 se comportent comme des plaques souples vibrantes et sont conçues de telle sorte que leur fréquence de résonance mécanique FM soit proche de la fréquence de résonance F0 de l'enceinte bass-reflex 2. Dans l'exemple, les plaques 20, 22 ont une fréquence de résonance mécanique FM de 153 Hz.These plates 20, 22 behave like flexible vibrating plates and are designed so that their mechanical resonance frequency F M is close to the resonance frequency F 0 of the bass-reflex enclosure 2. In the example, the plates 20, 22 have a mechanical resonance frequency F M of 153 Hz.
Pour caractériser la souplesse d'une plaque rectangulaire, on considère la fréquence du premier mode propre de vibration de la même plaque encastrée en ses quatre cotés, fréquence qui est donnée par la relation théorique suivante :To characterize the flexibility of a rectangular plate, we consider the frequency of the first natural mode of vibration of the same plate embedded in its four sides, frequency which is given by the following theoretical relation:
où D est le facteur de raideur de la plaque défini comme suitwhere D is the stiffness factor of the plate defined as follows
o- E h'o- E h '
12.(1 -/) ' h l'épaisseur de la plaque, a et b les dimensions des cotés du rectangle formé par la plaque ; p la masse volumique, Ε le module d'Young et μ le coefficient de Poisson du matériau. Dans le cas du PS - Hl, Ε = 2,1.109 N.rτr2, μ = 0,3 , p = 1050 kg.nr3.12. (1 - /) 'h the thickness of the plate, a and b the dimensions of the sides of the rectangle formed by the plate; p the density, Ε the Young's modulus and μ the Poisson's ratio of the material. In the case of PS - Hl, Ε = 2,1.10 9 N.rτr 2 , μ = 0.3, p = 1050 kg.nr 3 .
Dans l'application considérée (enceinte acoustique, notamment pour dispositifs d'affichage), on considère que la plaque est souple pour des valeurs de fréquence du premier mode propre Fv inférieures à 800 Hz, de préférence inférieures à 500 Hz. Dans l'exemple décrit ici, Fv = 243 Hz.In the application under consideration (acoustic enclosure, in particular for display devices), it is considered that the plate is flexible for first eigen mode frequency values F v less than 800 Hz, preferably less than 500 Hz. In the example described here, F v = 243 Hz.
En choisissant la résonance mécanique FM proche de (de préférence pratiquement égale à) la fréquence de résonance du bass-reflex, les plaques 20, 22 réalisent une atténuation et limitent l'influence de l'évent autour de la fréquence de résonance du bass-reflex F0, sans en changer la valeur, en absorbant en partie les vibrations dont la fréquence est proche de la fréquence de résonance mécanique FM.By choosing the mechanical resonance F M close to (preferably practically equal to) the resonance frequency of the bass reflex, the plates 20, 22 achieve an attenuation and limit the influence of the vent around the resonance frequency of the bass -reflex F 0 , without changing its value, by partially absorbing vibrations whose frequency is close to the mechanical resonance frequency F M.
Comme bien visible à la figure 3, l'enceinte bass-reflex 2 a donc une réponse acoustique (trait continu gras) améliorée en basse fréquence par rapport à un caisson sans évent (trait pointillé), sans toutefois présenter le pic de résonance trop pointu d'une enceinte bass-reflex classique (trait continu fin).As clearly visible in Figure 3, the bass-reflex 2 speaker therefore has an acoustic response (bold solid line) improved at low frequency compared to a ventless box (dotted line), without however presenting the peak of resonance too sharp a classic bass-reflex enclosure (thin solid line).
En variante, seule une des plaques peut être réalisée avec une rigidité inférieure aux parois du caisson 8, l'autre plaque étant par exemple réalisée de manière identique aux parois du caisson. Le dimensionnement de la plaque de rigidité inférieure sera alors conçu pour que l'évent constitue un système mécanique ayant une fréquence de résonance mécanique FM proche de la fréquence de résonance du bass-reflex F0 et réalise ainsi un moyen d'atténuation autour de la fréquence de résonance du bass-reflex, et donc notamment à la fréquence de résonance du bass-reflex.As a variant, only one of the plates can be produced with a rigidity lower than the walls of the box 8, the other plate being for example produced in an identical manner to the walls of the box. The dimensioning of the lower rigidity plate will then be designed so that the vent constitutes a mechanical system having a mechanical resonance frequency F M close to the resonance frequency of the bass reflex F 0 and thus achieves a means of attenuation around the resonance frequency of the bass reflex, and therefore in particular the resonance frequency of the bass reflex.
Dans l'exemple préféré expliqué ci-dessus, la fréquence de résonance mécanique est très proche de (sensiblement égale à) la fréquence de résonance du bass-reflex. Il est important de remarquer toutefois que l'invention n'est pas limitée à ce cas précis mais consiste à prévoir des moyens d'atténuation qui couvrent notamment la fréquence de résonance du bass-reflex.In the preferred example explained above, the mechanical resonant frequency is very close to (substantially equal to) the resonant frequency of the bass reflex. It is important to note, however, that the invention is not limited to this specific case but consists in providing attenuation means which notably cover the resonance frequency of the bass-reflex.
Pour déterminer la proximité des deux fréquences, on pourra se référer à des critères classiques : par exemple, la fréquence de coupure à -3 dB peut être considérée comme proche de la fréquence de résonance. To determine the proximity of the two frequencies, reference can be made to conventional criteria: for example, the cut-off frequency at -3 dB can be considered as close to the resonant frequency.
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0100906 | 2001-01-24 | ||
| FR0100906A FR2819974A1 (en) | 2001-01-24 | 2001-01-24 | ACOUSTIC SPEAKER AND AUDIOVISUAL APPARATUS COMPRISING SUCH A SPEAKER |
| PCT/FR2002/000223 WO2002060217A1 (en) | 2001-01-24 | 2002-01-21 | Enclosure and audio-visual apparatus comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1368987A1 true EP1368987A1 (en) | 2003-12-10 |
| EP1368987B1 EP1368987B1 (en) | 2005-12-14 |
Family
ID=8859156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02700340A Expired - Lifetime EP1368987B1 (en) | 2001-01-24 | 2002-01-21 | Enclosure and audio-visual apparatus comprising same |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7111706B2 (en) |
| EP (1) | EP1368987B1 (en) |
| JP (1) | JP3965120B2 (en) |
| CN (1) | CN100518383C (en) |
| DE (1) | DE60208000T2 (en) |
| ES (1) | ES2254640T3 (en) |
| FR (1) | FR2819974A1 (en) |
| WO (1) | WO2002060217A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013223950B4 (en) * | 2013-11-22 | 2018-11-15 | Henning Bosselmann | Speaker enclosure |
| CN111726710A (en) * | 2020-06-08 | 2020-09-29 | 无锡路通视信网络股份有限公司 | Intelligent sound post convenient to dismantle installation |
| FR3113475B1 (en) * | 2020-08-18 | 2022-11-04 | Renault Sas | SUBWOOFER |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2834423A (en) * | 1954-09-01 | 1958-05-13 | Robert L Bradford | High fidelity loud speaker enclosure |
| US3233695A (en) * | 1964-07-10 | 1966-02-08 | Budsen Corp | Speaker enclosure |
| US3319737A (en) * | 1966-06-17 | 1967-05-16 | Barthel Lucien | Acoustical enclosures |
| JPS4936416B1 (en) * | 1970-02-27 | 1974-09-30 | ||
| DE2727075A1 (en) * | 1977-06-13 | 1978-12-21 | Sinum Klangstrahler Gmbh | Double phase acoustic corrector - has small transverse deflector preventing flow back of sound so that it can be added |
| NL184037C (en) * | 1977-09-15 | 1989-03-16 | Novanex Automation Nv | SPEAKER SYSTEM. |
| US4756382A (en) * | 1987-03-02 | 1988-07-12 | Hudson Iii Joseph L | Loudspeaker having enhanced response at bass frequencies |
| FR2623337B1 (en) * | 1987-11-18 | 1990-06-08 | Dehaeze Jean Marie | |
| EP0361445A3 (en) * | 1988-09-28 | 1991-05-22 | Yamaha Corporation | Acoustic apparatus |
| US5432860A (en) * | 1990-02-09 | 1995-07-11 | Mitsubishi Denki Kabushiki Kaisha | Speaker system |
| EP0453230B1 (en) * | 1990-04-20 | 1995-06-21 | Matsushita Electric Industrial Co., Ltd. | Speaker system |
| US5170436A (en) * | 1991-01-24 | 1992-12-08 | Allan L. Powell | Acoustic speaker system |
| US5150417A (en) * | 1991-02-25 | 1992-09-22 | Socon Ab | Bass reflex type speaker system |
| JPH0549081A (en) * | 1991-08-09 | 1993-02-26 | Pioneer Electron Corp | Speaker system |
| US5327985A (en) * | 1991-12-02 | 1994-07-12 | Louis Porzilli | Acoustical transducer enclosure |
| US5659155A (en) * | 1991-12-02 | 1997-08-19 | Porzilli; Louis B. | Acoustical transducer enclosure |
| US5204501A (en) * | 1992-02-20 | 1993-04-20 | Tsao Ye Ming | Synchronous common polar resonant wall type speaker cabinet |
| US5475764A (en) * | 1992-09-30 | 1995-12-12 | Polk Investment Corporation | Bandpass woofer and method |
| US5809154A (en) * | 1994-01-04 | 1998-09-15 | Britannia Investment Corporation | Ported loudspeaker system and method |
| US5602367A (en) * | 1994-12-19 | 1997-02-11 | Meyer Sound Laboratories Incorporated | Multiple tuned high power bass reflex speaker system |
| FR2791802A1 (en) * | 1999-03-30 | 2000-10-06 | Thomson Multimedia Sa | MECHANICAL FILTER FOR ACOUSTIC SYSTEMS AND TELEVISION EQUIPPED WITH SUCH FILTERS |
| JP3778793B2 (en) * | 2000-01-28 | 2006-05-24 | 富士通テン株式会社 | Speaker system |
-
2001
- 2001-01-24 FR FR0100906A patent/FR2819974A1/en active Pending
-
2002
- 2002-01-21 JP JP2002560422A patent/JP3965120B2/en not_active Expired - Lifetime
- 2002-01-21 CN CNB028040333A patent/CN100518383C/en not_active Expired - Lifetime
- 2002-01-21 EP EP02700340A patent/EP1368987B1/en not_active Expired - Lifetime
- 2002-01-21 US US10/470,146 patent/US7111706B2/en not_active Expired - Lifetime
- 2002-01-21 DE DE60208000T patent/DE60208000T2/en not_active Expired - Lifetime
- 2002-01-21 ES ES02700340T patent/ES2254640T3/en not_active Expired - Lifetime
- 2002-01-21 WO PCT/FR2002/000223 patent/WO2002060217A1/en active IP Right Grant
Non-Patent Citations (1)
| Title |
|---|
| See references of WO02060217A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60208000D1 (en) | 2006-01-19 |
| FR2819974A1 (en) | 2002-07-26 |
| US20040055812A1 (en) | 2004-03-25 |
| DE60208000T2 (en) | 2006-06-22 |
| JP2004538672A (en) | 2004-12-24 |
| EP1368987B1 (en) | 2005-12-14 |
| ES2254640T3 (en) | 2006-06-16 |
| JP3965120B2 (en) | 2007-08-29 |
| CN100518383C (en) | 2009-07-22 |
| US7111706B2 (en) | 2006-09-26 |
| CN1488231A (en) | 2004-04-07 |
| WO2002060217A1 (en) | 2002-08-01 |
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