CN1250042C - Loudspeaker - Google Patents
Loudspeaker Download PDFInfo
- Publication number
- CN1250042C CN1250042C CNB00810297XA CN00810297A CN1250042C CN 1250042 C CN1250042 C CN 1250042C CN B00810297X A CNB00810297X A CN B00810297XA CN 00810297 A CN00810297 A CN 00810297A CN 1250042 C CN1250042 C CN 1250042C
- Authority
- CN
- China
- Prior art keywords
- conduit
- panel
- loud speaker
- cavity
- frequency
- 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 - Fee Related
Links
- 238000005452 bending Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims description 14
- 239000011358 absorbing material Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 13
- 230000004044 response Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 208000002925 dental caries Diseases 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000000926 separation method Methods 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
- H04R1/2853—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
- H04R1/283—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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Surgical Instruments (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
- Liquid Crystal (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
A loudspeaker has a bending wave panel (11) and an exciter (13) mounted on the panel to excite bendingg wave modes in the panel. A rear box (15) defines a cavity (17) in cooperation with the panel (11). A resonance of cavity and panel at a coupled mode resonance frequency may be controlled by providing a duct (19) coupled to the cavity to selectively reduce sound pressure at the coupled mode resonance frequency. Damping (21) may be provided in the duct (19).
Description
Technical field
The present invention relates to loud speaker and relate more particularly to include the loud speaker of resonance panel acoustic transmitter.
Background technology
In some are used, be better than most loud speaker is installed in the shallow cover (enclosure).
Particularly be used in the dispersal pattern loud speaker that is installed on the wall.If loud speaker has the opening back of the body, then adjacent wall will influence voice output out of control, because do not immobilized by the position of the loud speaker environment to another loud speaker.Providing of shallow cover can alleviate this problem.
Yet, shallow some shortcomings that are covered with.Powerful specifically coupling betides between panel and the cover.Air in the shallow cover is as a spring, and panel can vibrate on spring under a frequency, and as a firm body that moves forward and backward, this frequency is usually in range of sounds.The output of this resonance when loud speaker uses can produce uneven frequency response.This response can produce big listened to the peak value in the frequency response.
For low-quality application, electric circuit is the balance peak value rightly.Yet this balance is not suitable for high-quality product, and for example, temperature can influence this electric circuit according to different sound properties.
Damping is the other method that reduces this coupled mode peak value.Also be suitable for low-quality application.In addition, the damping meeting increases the width of peak value, so the sound of system is in that to add that damping ratio does not add damping also poor.
If it is useful that traditional piston type loud speaker can embed shallow cavity.Usually in a cover, this loud speaker is installed because if do not cover after this loud speaker, from the voice output at loud speaker back for disappearing mutually when the low frequency easily from the antiphase of anterior voice output.
Yet in this piston type loud speaker, the entire body mode resonance almost always is positioned at the low frequency end of loudspeaker response.In this case, but the sound during the voice output compensate for low frequency that is increased because of resonance descend, and extend the bass response of loud speaker.This expression audio amplifier can not be too shallow, and need big volume after the loud speaker.In order to make the shallow and resonance that in audio frequency, will hinder even frequency response of audio amplifier move to upper frequency, will teach different with tradition institute by used low frequency.
Summary of the invention
According to the present invention, one loud speaker is provided, comprise that one is used to launch the panel member of sound equipment, one is used to excite the exciter of this panel member with the emission sound equipment, one is positioned at and the common panel component audio amplifier afterwards that limits shallow cavity of panel member, produces the coupled resonance pattern of a panel component and cavity under a coupled mode frequency, has a conduit, its sound is coupled to this cavity, optionally reduces the sound press in the cavity under the coupled mode frequency.
This conduit can be used as pressure and releives instrument to absorb the pressure ripple under the selected frequency.Though think that simply the acoustic absorption device being added on cavity still can work, only can increase absorbability in wide field frequently with an absorber.The enough volume damping meetings of control of being used to resonate make it to be below or above resonance because of the shortcoming selectivity absorbability acoustic power that decays.And the degree of depth of shallow audio amplifier is enough not dark for the big thickness of absorber.
So-called shallow cavity means a cavity, behind panel not as the volume function, yet limited thickness produce as in the acoustics scope coupling one-piece pattern effect.Generally speaking, this cavity must this effect become serious before less than half of less plate level size, preferably less than reduced size 1/4th or 10% in.The cavity shallow then loud speaker of healing is thinner, and this is generally desirable.
Even sound can optionally absorb, still will accurately not transfer to a specific frequency by absorbability under the coupled mode frequency.For example, the resonance of this one-piece pattern can be considerably wide and this absorbability can be suitably broad.
In specific embodiment, the solution of being carried has many advantages in selectable method, and the first, the cost of conduit can be by providing original tool to be absorbed with the cost that forms cavity.Also tolerable variations in temperature of this method is because these change the air in parallel audio-visual conduit of meeting and the cavity.This method also is permanent.
This coupled mode can be one-piece pattern, because be generally prevailing model in the pattern that this pattern decays with needs in shallow cavity.
One end of conduit can be opening to cavity.The other end then is remains silent.Can provide grooving to adjust the characteristic of cavity in the conduit.
Conduit can be adjusted to the frequency in quarter-wave conduit to the coupled mode frequency 10%.Though the starting point in required frequency downcomer length is the quarter-wave of sound wave, whether precise length is deciding of bending by terminal correction and this conduit.This correction is known for those skilled in the art.Therefore, " quarter-wave long duct " means through suitable tuning conduit but not has the conduit of this wavelength really.As mentioned above, this coupled mode absorbability is distributed on the frequency range quite extensively, so this length does not need definitely to be 1/4th of coupled mode frequency wavelength.
More desirable than the more accurate harmony of above-mentioned 10% amplitude; Therefore, the frequency of this conduit preferably can transfer in 5% scope of coupled mode frequency.
Though can't obtain acoustic impedance completely, quarter-wave transfers practical impedance to virtual, and vice versa.Therefore, to can be used as for length be effective acoustic absorption device of the sound under the quarter-wave frequency to the quarter-wave long duct.
Conduit is not required to be straight.Slight bending can influence conduit a little and heavy camber can be piled (acoustic mass) by increase sound, makes it to turn down.As is well known, this effect can be offset by appropriate adjustment catheter length.
Conduit can optionally place the inboard or the outside of main cavity.
The experiment demonstration has bigger improvement when the sound-absorbing material is added on conduit.This sound-absorbing material can be acoustic fiber and/or foamed plastics.
In another kind was arranged, this conduit can be coupled to cavity and be separated with this cavity by a membranoid substance, caused this conduit to form an auxiliary cavity effectively.The coupling system of this conduit and membranoid substance can be arranged cause with near the frequency resonance of coupled mode/one-piece pattern in cavity.This cavity can place the plane that is different from main cavity.In addition, the absorption material in the conduit is useful.This membranoid substance itself can be by providing the damping in the membranoid substance, and/or the damping suspended substance of membranoid substance is provided and absorbs.
In addition, conduit can be and connects cavity and hole (aperture) on every side.In view of an approaching quarter-wave conduit, length determines the tuning of conduit, and in this arranged, the width of conduit and area provided some tuning.This is because area may be too little for holding logical lower frequency, and under upper frequency, this area then has bass emission effect.
In specific embodiment, can wherein omit this strip and cause panel in providing a strip (strip) around the panel limit to support the panel on the audio amplifier in the some in limit, audio amplifier and strip limit this conduit; In this situation, conduit can leave cavity and be opened in the air.This layout is simpler than the solution of the conduit that separation is provided.This strip can be a toughness, with toughness ground support panel.In this method, panel can freely be installed, that is no longer is sandwiched on the limit.
In specific embodiment, conduit can be the hole in panel the place ahead or the audio amplifier.Hole is preferably in the central area behind panel or the audio amplifier.Conduit then has less frequency selectivity than 1/4th sound wave flat boards, but is enough to be used in some application.
In the practicality, the sound press when a plurality of as above-mentioned conduit can be used to reduce coupled mode.
Also may provide a plurality of conduits to have the sound of a plurality of frequencies with absorption.
To illustrate that now one uses the special methods availalbe of a plurality of conduits.In the method, provide a plurality of 1/4th acoustic waveguide tubes of different frequency that are tuned to acoustics ground coupling cavity.This has changed the resonance mode in the cavity, especially can select these conduits with fundamental frequency that reduces cavity and the density that increases the frequency couple resonance mode.
This panel can be the distributed mode panel of working under the different resonance modes that intersperse among different frequency.This number that has increased pattern makes the coupling cover system can significantly improve the distributed mode loudspeaker performance with this multiple frequency-selective control.
Can provide 1/4th acoustic waveguide tubes along a side of cavity, in this case, the side of cavity can be considered the acoustic absorption device.
Even all patterns of the present invention all are applicable to the resonance bending wave loudspeaker, the resonance in any panel that present technique also can be used for removing undesired resonance or being coupled to shallow cavity.This can be used for making shallow audio amplifier piston type loud speaker.
Description of drawings
By example certain specific embodiments of the present invention is described referring now to accompanying drawing, wherein
Fig. 1 is the simplified schematic illustration of the present invention's first specific embodiment,
The simplified schematic illustration of Fig. 2 the present invention second specific embodiment,
Fig. 3 has conduit and does not have the experimental result of conduit for Fig. 2's,
Fig. 4 has the 3rd specific embodiment of membranoid substance for the present invention,
Fig. 5 and Fig. 6 have the 4th specific embodiment of grooving for the present invention,
The details of Fig. 7 to Fig. 9 for arranging the acoustic response that is calculated when becoming along with Fig. 5 when grooving length, and
Figure 10 has the 5th specific embodiment of some different length conduits for the present invention.
Embodiment
In Fig. 1, use the instruction of WO97/09842 to produce a dispersion pattern panel 11.This panel has a preferable dispersion pattern length-width ratio, promptly 1: 882 or 1: 0.707.One converter 13 is installed on a preferable transducer locations at panel rear.One shallow audio amplifier 15 and the panel 11 common shallow cavitys 17 that limit.Provide a conduit 19 in the cavity end.This conduit is the quarter-wave that air and the panel 11 in the cavity 17 supports the coupling one-piece pattern of the panel 11 on the interior spring that any elastomer constituted.Sound-absorbing material 21 is provided in conduit 19.
With reference to figure 2, it takes advantage of illustrated second specific embodiment in cavity 17 rear portions of 210mm for 260mm.Panel 11 forms the upper surface of cavity and the position that converter is shown in label 13.Four conduits 19 that provided are respectively in four sides of cavity.Every conduit length is 120mm; Therefore, four all tuning identical resonance of conduit are one-piece pattern resonance herein.
Fig. 3 ecbatic.The original frequency response is represented with chain-dotted line, and response dots to conduit.
This result represents that about 740 hertz of places cause the serious decay of resonant size because of conduit.The decay of 4dB is very serious for acoustics.If cooperate damping, the resonance decay then is able to further improvement.
Except providing membranoid substance 23 to divide conduit 19 and the cavity 17, Fig. 4 represents similarly to arrange with Fig. 1 specific embodiment.Adjusting conduit 19 makes it at the one-piece pattern frequency resonance.This conduit 19 can be positioned at the plane different with main cavity.Damping 21 is arranged in the conduit; This damping can be acoustic fiber or is used for the foamed plastics of acoustic damping traditionally.
This membranoid substance has a selection to be used to cooperate the density of membranoid substance resiliency supported, and it is vibrated with the selected resonance frequency of decision conduit at a resonance frequency.This resiliency supported can be arranged in the conduit and comprise foamed plastics, the air in the cavity or both combinations.
Fig. 5 and Fig. 6 represent the 4th specific embodiment of the present invention.Panel 11 is supported on the audio amplifier 15 by the resilient elongate sheet 29 around the panel limit.This panel support on audio amplifier from edge 31 apart from the 5mm place.Audio amplifier 15 and panel 11 around the panel with between the 2mm every being separated from each other.Strip limits grooving 33 along a side of panel at length direction.The function of this grooving is conduit but is different from a quarter-wave conduit-these conduits are particularly useful as the release sound press under the one-piece pattern frequency blow vent.
Carried out to calculate and changed the effect of grooving length and these results are shown in Fig. 7 to Fig. 9 with expression by limited element analysis technique.The grooving length that every figure is all different with one is relevant, is that unit is shown among the figure with mm.Length provides a level and smooth especially response for the grooving of 144.44mm.As what seen, near the Qiang Fengke 760 hertz uses the grooving of different length to be eliminated.In addition, the length of fine-tuning grooving makes made loud speaker have the acoustic response of an expectation.
Between single continuous grooving and one group of grooving (Fig. 9) that causes identical gross effect, some differences are arranged on effect, but these are different and not serious.
Figure 10 represents that the six roots of sensation is to wait the quarter-wave long duct 19 of the different length of level length between 80 to 180mm with 20mm.These conduits provide multiple frequency to select acoustics terminal (termination).
The acting as of these conduits 19 makes on the acoustics of border invisible over a range of frequencies.Calculate and show the useful resonance mode number that can significantly increase coupled system; These patterns are different from the pattern without conduit on quality.The resonance mode with quarter-wave conduit is listed on first three hurdle of table 1 and the resonance mode with this conduit is listed on last three hurdles.Can find out to have conduit than not having conduit higher model number is arranged significantly.
Table 1
| Conduit is arranged | Duct free | ||||
| 388.12 | 1309 | 2223.9 | 1320.3 | 2238.8 | |
| 479.63 | 1420.1 | 2355.7 | 1492.5 | 2334.1 | |
| 568.32 | 1512.1 | 2411.3 | 1516.6 | 2479.9 | |
| 646.05 | 1679.6 | 2556.8 | 660.16 | 1632 | 2599.2 |
| 749.62 | 1801.4 | 2624.6 | 746.26 | 1980.5 | 2640.7 |
| 837.16 | 1931.6 | 2686.6 | 1992.7 | 2744.1 | |
| 962.92 | 2002.1 | 2816.2 | 996.35 | ||
| 1141.6 | 2081.8 | 2844.9 | |||
| 1236.2 | 2190.9 | 2937.4 | 2116.4 | ||
In addition, cavity shows less rigidity by the control sound press under the one-piece pattern frequency, to such an extent as to minimum coupled mode is positioned at a favourable lower frequency.In example, lowest mode is positioned at 388 hertz but not 660 hertz, and need not change the external dimensions of the capacity or the audio amplifier of air.The model density of system also increases about 50% and reach in 3000 hertz of scopes of tabular.
Claims (20)
1. a loud speaker comprises
One is used to launch the panel component of sound,
One is used to excite the exciter of this panel component with emission sound,
One places the audio amplifier at this panel component rear portion, with the common shallow cavity that limits of this panel component, and in the coupled resonance pattern of coupled mode frequency generation one this panel component and cavity,
It is characterized in that this panel component is resonance bending wave parts, be coupled to this cavity, reduce the sound press of cavity under the coupled mode frequency with selectivity by a conduit acoustics.
2. loud speaker as claimed in claim 1, wherein this coupled mode is vibrate one-piece pattern on its suspended substance of this panel component.
3. as the loud speaker of claim 1 or 2, wherein the sound-absorbing material is arranged in this conduit.
4. loud speaker as claimed in claim 1 or 2, wherein this conduit is adjusted into the quarter-wave long duct of a frequency in this coupled mode frequency 10%.
5. loud speaker as claimed in claim 4, wherein the frequency of this conduit is adjusted in 5% scope of coupled mode frequency.
6. as the loud speaker of claim 1 or 2, wherein this conduit is coupled to and is isolated from this cavity by a membranoid substance, is adjusted in 5% scope of coupled mode frequency in the cavity comprising the coupled system frequency of this membranoid substance and this conduit.
7. loud speaker as claimed in claim 1 or 2, wherein this conduit is the hole that is arranged in the cavity, is positioned at panel component central authorities or in the face of the audio amplifier rear of these panel component central authorities.
8. loud speaker as claimed in claim 1 or 2 wherein is provided with a plurality of conduits to absorb the sound of this coupled mode frequency.
9. loud speaker as claimed in claim 1 or 2 wherein is provided with a plurality of conduits to absorb the sound of a plurality of frequencies.
10. loud speaker as claimed in claim 1 or 2, wherein this panel is the dispersion pattern panel.
11. loud speaker as claimed in claim 1, wherein this conduit is arranged on the hole of cavity edge.
12. as the loud speaker of claim 11, wherein this coupled mode is vibrate one-piece pattern on its suspended substance of this panel component.
13. as claim 11 or 12 described loud speakers, wherein the sound-absorbing material is arranged in this conduit.
14. as claim 11 or 12 described loud speakers, wherein this conduit is adjusted into the quarter-wave long duct of a frequency in this coupled mode frequency 10%.
15. as the loud speaker of claim 14, wherein the frequency of this conduit is adjusted in 5% scope of coupled mode frequency.
16. as claim 11 or 12 described loud speakers, wherein on this audio amplifier, provide a strip to support this panel, wherein save this strip so that this panel, audio amplifier and strip limit this conduit in the part limit along the panel edges border.
17. as the loud speaker of claim 16, wherein this strip has elasticity.
18., a plurality of conduits wherein are set to absorb the sound of this coupled mode frequency as claim 11 or 12 described loud speakers.
19., a plurality of conduits wherein are set to absorb the sound of a plurality of frequencies as claim 11 or 12 described loud speakers.
20. as claim 11 or 12 described loud speakers, wherein this panel is the dispersion pattern panel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9917908.7A GB9917908D0 (en) | 1999-07-30 | 1999-07-30 | Loudspeakers |
| GB9917908.7 | 1999-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1360809A CN1360809A (en) | 2002-07-24 |
| CN1250042C true CN1250042C (en) | 2006-04-05 |
Family
ID=10858223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00810297XA Expired - Fee Related CN1250042C (en) | 1999-07-30 | 2000-07-24 | Loudspeaker |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP1201102B1 (en) |
| JP (1) | JP2003526968A (en) |
| CN (1) | CN1250042C (en) |
| AT (1) | ATE244494T1 (en) |
| AU (1) | AU6003700A (en) |
| DE (1) | DE60003692D1 (en) |
| GB (1) | GB9917908D0 (en) |
| HK (1) | HK1042012B (en) |
| NZ (1) | NZ516351A (en) |
| TW (1) | TW490988B (en) |
| WO (1) | WO2001010168A2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6988339B2 (en) | 2002-02-06 | 2006-01-24 | Andersen Corporation | Specialty media window |
| US7426804B2 (en) | 2002-02-06 | 2008-09-23 | Andersen Corporation | Specialty display window |
| US7207413B2 (en) * | 2003-06-02 | 2007-04-24 | Tbi Audio Systems Llc | Closed loop embedded audio transmission line technology for loudspeaker enclosures and systems |
| GB0400323D0 (en) * | 2004-01-08 | 2004-02-11 | New Transducers Ltd | Loudspeakers |
| GB0410962D0 (en) | 2004-05-17 | 2004-06-16 | Mordaunt Short Ltd | Loudspeaker |
| US20060061504A1 (en) * | 2004-09-23 | 2006-03-23 | The Regents Of The University Of California | Through wall detection and tracking system |
| WO2007109828A1 (en) * | 2006-03-28 | 2007-10-04 | Immersion Technology Property Limited | Loudspeaker system with acoustic equalisation |
| CN104038855A (en) * | 2014-06-04 | 2014-09-10 | 瑞声光电科技(常州)有限公司 | Electric acoustic device and assembly method for same |
| EP3528510B1 (en) * | 2016-10-13 | 2022-02-09 | Panasonic Intellectual Property Management Co., Ltd. | Flat speaker and display device |
| CN107205194B (en) * | 2017-06-07 | 2020-03-06 | 鞠波 | Sound box and sound box system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848090A (en) * | 1971-11-18 | 1974-11-12 | J Walker | Wall hanging speaker system |
| US3938617A (en) * | 1974-01-17 | 1976-02-17 | Fort Enterprises, Limited | Speaker enclosure |
| US4899390A (en) * | 1986-09-19 | 1990-02-06 | Matsushita Electric Industrial Co., Ltd. | Thin speaker having an enclosure within an open portion and a closed portion |
| DE69110530T2 (en) * | 1990-04-20 | 1996-02-29 | Matsushita Electric Ind Co Ltd | Speaker system. |
| UA51671C2 (en) * | 1995-09-02 | 2002-12-16 | Нью Транзд'Юсез Лімітед | Acoustic device |
-
1999
- 1999-07-30 GB GBGB9917908.7A patent/GB9917908D0/en not_active Ceased
-
2000
- 2000-07-24 WO PCT/GB2000/002784 patent/WO2001010168A2/en active IP Right Grant
- 2000-07-24 CN CNB00810297XA patent/CN1250042C/en not_active Expired - Fee Related
- 2000-07-24 DE DE60003692T patent/DE60003692D1/en not_active Expired - Lifetime
- 2000-07-24 JP JP2001513935A patent/JP2003526968A/en active Pending
- 2000-07-24 NZ NZ516351A patent/NZ516351A/en unknown
- 2000-07-24 AT AT00946162T patent/ATE244494T1/en not_active IP Right Cessation
- 2000-07-24 EP EP00946162A patent/EP1201102B1/en not_active Expired - Lifetime
- 2000-07-24 AU AU60037/00A patent/AU6003700A/en not_active Abandoned
- 2000-07-27 TW TW089115038A patent/TW490988B/en not_active IP Right Cessation
-
2002
- 2002-05-13 HK HK02103615.7A patent/HK1042012B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE60003692D1 (en) | 2003-08-07 |
| WO2001010168A2 (en) | 2001-02-08 |
| HK1042012B (en) | 2003-10-03 |
| EP1201102B1 (en) | 2003-07-02 |
| GB9917908D0 (en) | 1999-09-29 |
| AU6003700A (en) | 2001-02-19 |
| JP2003526968A (en) | 2003-09-09 |
| TW490988B (en) | 2002-06-11 |
| HK1042012A1 (en) | 2002-07-26 |
| CN1360809A (en) | 2002-07-24 |
| EP1201102A2 (en) | 2002-05-02 |
| WO2001010168A3 (en) | 2001-08-16 |
| NZ516351A (en) | 2002-09-27 |
| ATE244494T1 (en) | 2003-07-15 |
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