EP1368987B1 - Enceinte acoustique et appareil audiovisuel comportant une telle enceinte - Google Patents
Enceinte acoustique et appareil audiovisuel comportant une telle enceinte Download PDFInfo
- Publication number
- EP1368987B1 EP1368987B1 EP02700340A EP02700340A EP1368987B1 EP 1368987 B1 EP1368987 B1 EP 1368987B1 EP 02700340 A EP02700340 A EP 02700340A EP 02700340 A EP02700340 A EP 02700340A EP 1368987 B1 EP1368987 B1 EP 1368987B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vent
- bass
- reflex
- enclosure
- box
- 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
Links
- 239000000725 suspension Substances 0.000 claims description 5
- 230000011514 reflex Effects 0.000 description 8
- 230000004044 response Effects 0.000 description 8
- 229920005669 high impact polystyrene Polymers 0.000 description 3
- 239000004797 high-impact polystyrene Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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 apparatus comprising such an enclosure.
- a vent acoustic speaker comprising at least one electro-acoustic transducer, such as a speaker, mounted in a box.
- a speaker is generally called bass-reflex enclosure or ventilated enclosure.
- the assembly constituted by the volume of the box and the vent reacts to the vibratory excitations of the loudspeaker as an oscillating system (Helmholtz resonator), with a resonant frequency F 0 called resonance frequency of the bass-reflex.
- Helmholtz resonator oscillating system
- F 0 resonant frequency of the bass-reflex
- bass-reflex speaker is particularly known in audiovisual devices, such as televisions, as described for example in the utility model JP 63-183 788.
- Patent Applications US-5,659,155, FR-A-2,403,706 and DE-A-2 727,975 also disclose loudspeakers with vents according to the preamble of claim 1. These speakers however do not include attenuation means at the resonant frequency Fo.
- the vent includes attenuation means at the resonance frequency of the bass reflex.
- the invention also proposes an audiovisual apparatus which comprises a display device and such a speaker.
- the speaker 2 shown in Figure 2 has four speakers 4 mounted on the front face 6 of a parallelepipedic box 8 of which the walls are made of wood.
- the speakers 4 are aligned on the face before 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 Y direction.
- the box also includes a rear face 7 parallel to the front face and two lateral faces 14.
- the speakers are of type Odyssey 1 with suspension in foam.
- the dimensions of the box 8 in the example studied are the following: height 250 mm (between upper face 10 and lower face 12); width 43 mm (between lateral faces 14); depth 55 mm (between face front 6 and back 7).
- the chamber 2 also comprises a vent 16 consisting of a rectangular opening 18 in the front face 6 as well as a plate upper 20 and a lower plate 22 parallel to the upper faces 10 and lower 12.
- the opening 18 is not necessarily rectangular; it could alternatively be oblong.
- the lower plates 22 and 20 do not extend over the entire depth of the well 8 (that is, their area is less than that of the lower faces 12 and 10). In the example, she extend over 40 mm. Of course, alternatively, the plates may have different lengths from each other. They are not necessarily rectangular or perfectly flat.
- the lower plates 22 and 20 are spaced 5 mm and thus define between them a volume of vent which opens on the one hand on the outside of the box 8 through the opening 18 and secondly on the inside of the box.
- the lower plates 22 and 20 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 chamber 2 having a resonance frequency F 0 of 155 Hz.
- the lower plates 22 and upper 20 each have a inferior rigidity to the walls of the box 8.
- the plates 20, 22 are made of PS - HI (high impact polystyrene) with a thickness of 0.17 mm.
- These plates 20, 22 behave like vibrating flexible 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.
- the plates 20, 22 attenuate and limit the influence of the vent around the resonance frequency of the bass -reflex F 0 , without changing its value, absorbing in part the vibrations whose frequency is close to the mechanical resonance frequency F M.
- the bass-reflex loudspeaker 2 therefore has an acoustic response (bold continuous line) improved in low frequency compared to a box without a vent (dotted line), without, however, presenting the resonance peak that is too sharp.
- a classic bass - reflex speaker tilt continuous line
- only one of the plates can be made with a lower rigidity to the walls of the box 8, the other plate being for example made identically to the walls of the box.
- the dimensioning of the lower stiffness 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 provides a means of attenuation around the resonance frequency of the bass-reflex, and thus in particular the resonance frequency of the bass-reflex.
- the mechanical resonance frequency is very close to (substantially equal to) the resonance 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 cover in particular the resonance frequency of the bass reflex.
- the cut-off frequency at -3 dB can be considered close to the resonance 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)
Description
- l'évent comporte au moins une plaque souple ;
- l'évent comporte au moins une plaque dont la fréquence de résonance mécanique est proche de la résonance du 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.
- la figure 1 représente les réponses fréquentielles de systèmes connus, comme déjà expliqué ci-dessus ;
- la figure 2 représente une enceinte acoustique réalisée conformément aux enseignements de l'invention ;
- la figure 3 représente la réponse fréquentielle de l'enceinte acoustique de la figure 2 comparée aux réponses fréquentielles de la figure 1.
Claims (7)
- Enceinte acoustique (2) comportant un caisson (8), sur lequel est monté au moins un transducteur électro-acoustique (4), et un évent (16) qui réalise avec le caisson (8) un système bass-reflex avec une fréquence de résonance du bass-reflex déterminée (F0),
caractérisé en ce que l'évent (16) comporte des moyens d'atténuation (20 ; 22) à ladite fréquence de résonance du bass-reflex (F0). - Enceinte selon la revendication 1, caractérisée en ce que l'évent (16) comporte au moins une plaque souple (20 ; 22).
- Enceinte selon la revendication 1, caractérisée en ce que l'évent (16) comporte au moins une plaque (20 ; 22) dont la fréquence de résonance mécanique (FM) est proche de la résonance du bass-reflex (F0).
- Enceinte selon la revendication 1, caractérisée en ce que l'évent (16) comporte au moins une plaque (20 ; 22) dont la fréquence de résonance mécanique (FM) est pratiquement égale à la fréquence de résonance du bass-reflex (F0).
- Enceinte selon l'une des revendications 1 à 4, caractérisée en ce que l'évent (16) comporte deux plaques souples (20, 22) qui définissent un volume d'évent débouchant dans une ouverture (18) du caisson (8).
- Enceinte selon l'une des revendications 1 à 5, caractérisée en ce que le transducteur électro-acoustique est un haut-parleur (4) à suspension dure.
- Appareil audiovisuel caractérisé en ce qu'il comporte un dispositif d'affichage et une enceinte (2) selon l'une des revendications 1 à 6.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0100906 | 2001-01-24 | ||
FR0100906A FR2819974A1 (fr) | 2001-01-24 | 2001-01-24 | Enceinte acoustique et appareil audiovisuel comportant une telle enceinte |
PCT/FR2002/000223 WO2002060217A1 (fr) | 2001-01-24 | 2002-01-21 | Enceinte acoustique et appareil audiovisuel comportant une telle enceinte |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1368987A1 EP1368987A1 (fr) | 2003-12-10 |
EP1368987B1 true EP1368987B1 (fr) | 2005-12-14 |
Family
ID=8859156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02700340A Expired - Lifetime EP1368987B1 (fr) | 2001-01-24 | 2002-01-21 | Enceinte acoustique et appareil audiovisuel comportant une telle enceinte |
Country Status (8)
Country | Link |
---|---|
US (1) | US7111706B2 (fr) |
EP (1) | EP1368987B1 (fr) |
JP (1) | JP3965120B2 (fr) |
CN (1) | CN100518383C (fr) |
DE (1) | DE60208000T2 (fr) |
ES (1) | ES2254640T3 (fr) |
FR (1) | FR2819974A1 (fr) |
WO (1) | WO2002060217A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013223950B4 (de) * | 2013-11-22 | 2018-11-15 | Henning Bosselmann | Lautsprechergehäuse |
CN111726710A (zh) * | 2020-06-08 | 2020-09-29 | 无锡路通视信网络股份有限公司 | 一种便于拆卸安装的智能音柱 |
FR3113475B1 (fr) * | 2020-08-18 | 2022-11-04 | Renault Sas | Caisson de basse |
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 (fr) * | 1970-02-27 | 1974-09-30 | ||
DE2727075A1 (de) * | 1977-06-13 | 1978-12-21 | Sinum Klangstrahler Gmbh | Doppelphasenkorrektor |
NL184037C (nl) * | 1977-09-15 | 1989-03-16 | Novanex Automation Nv | Luidsprekerstelsel. |
US4756382A (en) * | 1987-03-02 | 1988-07-12 | Hudson Iii Joseph L | Loudspeaker having enhanced response at bass frequencies |
FR2623337B1 (fr) * | 1987-11-18 | 1990-06-08 | Dehaeze Jean Marie | |
EP0361445A3 (fr) * | 1988-09-28 | 1991-05-22 | Yamaha Corporation | Appareil acoustique |
US5432860A (en) * | 1990-02-09 | 1995-07-11 | Mitsubishi Denki Kabushiki Kaisha | Speaker system |
DE69110530T2 (de) * | 1990-04-20 | 1996-02-29 | Matsushita Electric Ind Co Ltd | Lautsprechersystem. |
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 (ja) * | 1991-08-09 | 1993-02-26 | Pioneer Electron Corp | スピーカシステム |
US5659155A (en) * | 1991-12-02 | 1997-08-19 | Porzilli; Louis B. | Acoustical transducer enclosure |
US5327985A (en) * | 1991-12-02 | 1994-07-12 | Louis Porzilli | 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 (fr) * | 1999-03-30 | 2000-10-06 | Thomson Multimedia Sa | Filtre mecanique pour systemes acoustiques et televiseur equipe de tels filtres |
JP3778793B2 (ja) * | 2000-01-28 | 2006-05-24 | 富士通テン株式会社 | スピーカシステム |
-
2001
- 2001-01-24 FR FR0100906A patent/FR2819974A1/fr active Pending
-
2002
- 2002-01-21 JP JP2002560422A patent/JP3965120B2/ja not_active Expired - Lifetime
- 2002-01-21 DE DE60208000T patent/DE60208000T2/de not_active Expired - Lifetime
- 2002-01-21 US US10/470,146 patent/US7111706B2/en not_active Expired - Lifetime
- 2002-01-21 ES ES02700340T patent/ES2254640T3/es not_active Expired - Lifetime
- 2002-01-21 CN CNB028040333A patent/CN100518383C/zh not_active Expired - Lifetime
- 2002-01-21 WO PCT/FR2002/000223 patent/WO2002060217A1/fr active IP Right Grant
- 2002-01-21 EP EP02700340A patent/EP1368987B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2819974A1 (fr) | 2002-07-26 |
DE60208000D1 (de) | 2006-01-19 |
ES2254640T3 (es) | 2006-06-16 |
EP1368987A1 (fr) | 2003-12-10 |
CN1488231A (zh) | 2004-04-07 |
DE60208000T2 (de) | 2006-06-22 |
US20040055812A1 (en) | 2004-03-25 |
US7111706B2 (en) | 2006-09-26 |
JP2004538672A (ja) | 2004-12-24 |
CN100518383C (zh) | 2009-07-22 |
WO2002060217A1 (fr) | 2002-08-01 |
JP3965120B2 (ja) | 2007-08-29 |
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