CN1195458A - Panel-form loudspeakers - Google Patents
Panel-form loudspeakers Download PDFInfo
- Publication number
- CN1195458A CN1195458A CN96196710.2A CN96196710A CN1195458A CN 1195458 A CN1195458 A CN 1195458A CN 96196710 A CN96196710 A CN 96196710A CN 1195458 A CN1195458 A CN 1195458A
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- China
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- transducer
- reflector
- plate
- panel
- form loudspeakers
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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
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Holo Graphy (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
A panel-form loudspeaker (81) having a distributed mode acoustic radiator (2, 4) and a first transducer (9) coupled to the radiator (2) to excite distributed mode resonance in the radiator, characterised by a second transducer (9) coupled to vibrate the radiator.
Description
The present invention relates to loud speaker, relate in particular to the loud speaker that contains board-like acoustic emission element.
Proposed a kind of panel-form loudspeakers in GB-A-2262861, it comprises:
A resonance multi-mode transmitter components, it is a unit sandwich plate of being made and had the spacer core of horizontal honeycomb by two kinds of skin-materials, wherein plate is such, its bending strength (B) on all directions with respect to the plate quality (μ) of per unit surface area cube ratio be at least 10;
An erecting device, it is supported this plate or is connected to a support body frame on this plate in a kind of free undamped mode;
And an electromechanical drive unit that is coupled on this plate, it is used for responding the electricity input of speaker operation frequency band with excitation multi-mode resonance in expelling plate.
The element that embodiments of the invention use its characteristic, structure and configuration can be usually and/or distinguishingly obtain by our instruction of PCT application number (our case number for P.5711) of pending trial of fulfiling same period therewith.Such element thereby: have the ability to keep and propagate the vibrational energy of importing by bending wave in the operating area that extends to the element edge in (but needn't) laterally usually along thickness; With or make without the anisotropy of bending strength, have and in described zone, distribute and be of value to the mode of resonance vibrating mass of sound with the surrounding air coupling; And in described zone, have predetermined optimum position or place, this position or place are used for transducer apparatus, its effective active or moving parts particularly, this part for the acoustic vibration activity in the described zone and corresponding to such vibration activity sound content signal, normally the signal of telecommunication is effective.In the international application no of the pending trial of the same period therewith (our reel number for P.5711), looking forward to such element as or " passive " acoustic device at no transducer apparatus in application, such as being used for reverberation or being used for the sound filtration or being used for to a spatial sound " adjustment " acoustic device (voicing); And be used for having " active " acoustic device of transducer apparatus, such as sound source or loud speaker quite on a large scale are provided when providing the input signal that is converted into described sound, or be used for such as when being exposed to the microphone that to be converted under the sound of other signal.
The invention particularly relates to the active acoustic device of loud speaker form.Above element be called the distributed acoustic reflector here and be intended as above-mentioned PCT application and/or other is in this feature that provides especially.
A kind of panel-form loudspeakers according to the present invention comprises: distributed reflector; First transducer is installed on the reflector, is used for the distributed resonance of stimulated emission device, it is characterized in that, also connects one second transducer, makes the reflector vibration.First and second transducer can be worked under different frequency ranges.One of them can be an electromagnetic type, and one of them can be a piezoelectric type.
Panel-form loudspeakers can be mounted on first reflector or one second distributed acoustic reflector wherein, one resilient suspension connects ground one, two reflectors, first transducer fully also ad hoc is installed on first reflector, and second transducer fully also ad hoc is installed on second reflector.Second reflector can be installed in the hole of first reflector.
Mode is with reference to the accompanying drawings to the present invention's graphic extension in addition, wherein by way of example:
Fig. 1 is the international application no of common pending trial that shows our same period therewith ... the sketch of illustrated and claimed distributed mode speaker in (our case number be P.5711);
Fig. 2 a is the partial section along Figure 1A-the A line is got;
Fig. 2 b is the cutaway view that the distributed reflector shown in Fig. 2 a amplifies, and has shown the two kinds of structures that can replace;
Fig. 3 is the sketch according to first embodiment of distributed mode speaker of the present invention;
Fig. 4 is the schematic diagram according to second embodiment of distributed mode speaker of the present invention;
Fig. 5 is the schematic diagram according to the 3rd embodiment of distributed mode speaker of the present invention;
Fig. 6 is the schematic diagram according to the 4th embodiment of distributed mode speaker of the present invention; And
Fig. 7 is the schematic diagram of a transducer.
With reference to the Fig. 1 in the accompanying drawing, shown the illustrated and panel-form loudspeakers 81 that requires in our international application no (our case number for P.5711) of common pending trial of same period therewith, it comprises the rectangular frame 1 that has resilient suspension 3, and described suspension centers in it and supporting a distributed acoustic expelling plate 2 week.Such as transducer 9 with reference to detailed description in our international application no (our case number be P.56831415) of pending trial of same period therewith, intactly and exclusively be installed on the plate 2 or preset bearing that wherein limits by x and y, the calculating that illustrates in our international application no (our case number be P.5711) of pending trial of the position in its orientation by same period therewith, in plate, make plate resonance launch output with the emission bending wave.
Transducer 9 is driven by a signal amplifier 10 such as audio frequency amplifier that is connected on the transducer by conductor 28.The load of amplifier and power demand can be standards fully, are similar to common tapered loud speaker, and its sensitivity level is 86-88dB/watt under the condition of indoor loading.The amplifier load impedance is roughly 6ohms, and Power Processing is 20-80watts.Wherein plate core and/or top layer are made of metal, and they can be for transducer plays radiator, the heat of the motor coil of transducer is left and therefore improve Power Processing.
Fig. 2 a and 2b are the local typical cutaway views of the loud speaker 81 of Fig. 1.Fig. 2 a has shown that framework 1, surround 3 and plate 2 cemented joint 20 by separately links together.The suitable frame material comprises the light weight framework, for example by the frame frame of making such as the extrusion metal or the plastics of aluminium alloy.Suitable surround material comprises the elastomeric material such as foam rubber and foamed plastics.The viscose glue of suitable joint 20 comprises viscose glues such as epoxy, polypropylene and cyanogen propylene.
Fig. 2 b has illustrated that on the ratio of amplifying plate 2 is rigidity weight templates that have such as the made core 22 of rigidity plastics foam 97, this rigidity plastics foam for example is the latticed matrix 98 that interlinkage polyvinyl chloride or metal forming, plastics or analog are made, its cell extends transverse to board plane, and by being enclosed such as the top layer 21 of the made opposition of paper, card, plastics or metal forming or thin plate.When its mesexine is made of plastics, can strengthen to improve their modulus in a kind of mode of knowing by using such as carbon, glass, kevlar (RTM) or similar fiber.
Top layer layer material and the reinforce that can look forward to comprises paper, bonding ply of paper, melamine glue and such as polyester film, kapton, polyvinyl chloride, phenol, polyester or relevant plastics, fibre reinforced plastics etc. and sheet metal or paper tinsel, comprises that again carbon, glass, kevlar (RTM), Nomex (RTM) are the fiber of various twisting thread (lays) such as aromatic polyamide and textile-like.Investigation to the Vectra level of liquid crystal polymer thermoplastic shows that they are useful for injection moulding such as the ultra-thin property top layer below the diameter 30cm or the top layer of smaller szie.This material self has formed the crystal structure of an orientation on the direction of spraying, this orientation is the preferential direction that high-frequency energy is propagated into well panel area from drive point.
Additional this and injection moulding other thermoplastic makes injection mold have location and alignment feature such as groove or ring, in order to the transducer element of accurate location such as motor coil and magnet suspension.Some additional more weak core material it is calculated that and help increasing such as local skin depth in 150% zone that reaches transducer diameter or the annular, strengthen that piece zone and help vibrational energy is coupled in the plate.The high-frequency response will be improved with softer foamed material by this device.
The core material that can look forward to had both comprised foamed plastic or foamed plastics or paper pulp material, even if suitable low-density aerosol metal, comprise the latticed of manufacturing or corrugated aluminium alloy sheet or paper tinsel again, or Kevlar (RTM), Nomex (RTM), common or bonding paper, and various synthetic plastic films.Some suitable core materials have been showed the spontaneous top layer that it is useful effectively and/or have been had natural enough intensity to be used to not have the top layer interlayer of laminate patch in its manufacture process.Known a kind of high performance its trade mark of latticed core material is called ' Rohacell ', and it can be used as expelling plate and does not have the top layer.From the aspect of reality, its objective is the comprehensive fineness and the intensity that obtain to be suitable for special purposes, particularly comprise the optimal components of core and top layer layer and the conduction between them.
Some optimization formulas that are used for plate use metal and metal alloy top layer, maybe can be for being the carbon fiber reinforce.All these, and the design of alloy aerosol or wire netting trellis core, actual radio shielding feature all will be arranged, this feature is important in some EMC use.Common plate or cone loudspeaker do not have intrinsic EMC screening ability.
In addition, the preferred dynamic transducer of piezoelectricity has insignificant electromagnetic emission or stray field.Common loud speaker has a big magnetic field, if not adopt special compensation countermeasure will reach 1 meter distance.
The position that need to keep shielding in application can or can be used a kind of conductivity foam when the mounting edge or similar connector for electrical connector of conduction portion manufacturing of suitable DML plate.
Effectively describedly select damping to comprise special application to the light sheet material of plate and permanent connected device.Edge and angle are significant especially to low frequency modes main and its plate dispensed in small quantity.Being fixed with along the limit of damping device is beneficial to and produces the plate that its described light sheet material installs framework fully, although its angle may be often relatively free, such as for required low frequency operation.Attachment can be with viscose glue or self adhesive material.The damping form that other is useful aspect meticulousr effect and/or intermediate frequency and high frequency, can or be secured to the material of being scheduled in the above zone of light sheet material on the effectively central local location by suitable material especially.
It is two-way resembling top illustrated sound plate.The acoustic energy that sends does not from behind have very strong relation with the acoustic energy that sends previously on phase place.The result helps: acoustical power adds up in this room comprehensively, the propagation of equifrequent acoustic energy, reduced reflection and standing wave effect and helped that high-quality ground reproduces place and environment in the acoustical reproduction record.
Although the emission of sending from the sound plate mainly is unoriented, the percentage axle of the information relevant with phase place increases outward.Because the focus after the improvement of imaginary stereo image, the orientation of loud speaker are the same with picture, on the height when usually the people is upright, thereby provide the axle exterior orientation of favourable appropriateness, the stereoeffect of the best is provided for the audience who is seated usually.Equally, a triangle left side/right geometric figure with respect to the audience provides another angle component.The good stereo acquisition that comes to this.
Compare with common loudspeaker reproduction, the present invention also has the advantage at a group audience.The inherent propagation characteristic of sound plate audio emission has given its volume of not observing the square distance law of reciprocity of identical point source.Because the intensity that reduces with distance is much smaller than the intensity of being predicted by inverse square law, the result is for off-center and the bad hearer in position, and the plate loud speaker is compared its intensity field with common loud speaker and promoted a better stereophonic effect.This is because off-centered hearer can't suffer dual problem owing near the loud speaker approaching; At first near the loudness of loud speaker increases greatly, and the loudness of loud speaker far away then is corresponding to be reduced.
Panel-form loudspeakers flat, light weight also has advantage, and it is visually attractive, has good sound quality and only needs a transducer and the gamut sound that sends from each plate film does not have overlapping.
Fig. 3 shows the similar generally loud speaker of loud speaker a kind of to illustrated in figures 1 and 2, wherein, forms an essentially rectangular hole 82 in the border of distributed board 2, and one second distributed province expelling plate 4 has been installed in the hole, and a resilient suspension 3 is arranged between two plates.The structure of plate 4 is identical with plate 2, as has the separately center core 22 on top layer 21.Plate 4 also is installed on it or the wherein transducer 9 driving generation high frequency sound outputs of pre-position exclusively by complete, and plate 2 is exported by independent transducer 9 driving generation all-bottom sounds.Therefore, loud speaker can be easy to cover whole sound spectrum.If sheet material attenuate high frequency and cause loss, so this structure are just of great use.A transducer can be installed not only to improve performance on each or plate.
Fig. 4 shows distributed board 2, and how as depicted in figs. 1 and 2 the sort of is driven and resonance by a pair of transducer 70,71.Littler transducer 70 is a kind of high frequency PZT (piezoelectric transducer)s, as shown in Figure 7 the sort of; Bigger transducer 71 is a kind of electronic, the sort of in the time of as the applicant as shown in the international application of pending trial (reel number P5683/4/5).
Transducer 70,71 is driven by the amplifier in parallel with it, in view of the high voltage requirement of PZT (piezoelectric transducer), inserts a step-up transformer 72 and build-out resistor 73 on its circuit.More than one transducer 70 or transducer 71 can be set, to improve performance.
Fig. 5 shows according to distributed board 2 of the present invention, and how as depicted in figs. 1 and 2 the sort of is driven by a pair of transducer 70,74.Transducer 70 is a kind of high frequency PZT (piezoelectric transducer)s, as shown in Figure 7 the sort of; Transducer 74 is a kind of low frequency PZT (piezoelectric transducer)s, the sort of in the time of as the applicant as shown in the international application of pending trial (reel number P5684).Label 75 expression transducers 74 add the quality counterweight to increase its inertia.Transducer 70,74 is driven by the amplifier in parallel with it 10, resistance 78 is arranged to form dividing network therebetween.On demand, more than one transducer 70 and/or transducer 74 can be set, to improve performance.
Fig. 6 shows according to distributed board 2 of the present invention, and how as depicted in figs. 1 and 2 the sort of is driven by a pair of transducer 68,69.Transducer 68,69th, electrodynamic transducer is as applicant's the sort of shown in the international application (reel number P.5683/4/5) of pending trial simultaneously.
Transducer 68 is a high frequency driver, has small inductor; Transducer 69 is the low frequency driver, has big inductance.
Transducer 68,69 amplifiers 10 are in parallel to be driven, and the electric capacity 77 as frequency divider is arranged on the circuit of transducer 68, with by most high-frequency signal and pass to transducer 68.On demand, more than one transducer 68 and/or transducer 69 can be set, to improve performance.
Fig. 7 shows a kind of transducer 9 that is used for distributed board 2, and it is the crystalline flexural piezoelectric device 27 that is installed in as on the disks such as brass, and is bonded to by for example binding agent 20 on the face of plate 2.At work, acoustical signal is added on the transducer 9 through lead 28, makes 27 bendings of piezoelectricity disk, and causes the distortion of plate 2 local elasticities, launches bending wave in plate.
Claims (10)
1. panel-form loudspeakers comprises the distributed acoustic reflector and is installed on the reflector in order to first transducer of the distributed resonance in the stimulated emission device, it is characterized by and is connected with second transducer so that the reflector vibration.
2. according to the described panel-form loudspeakers of claim 1, it is characterized in that described first and second transducer is used for working in different frequency ranges.
3. according to claim 1 or 2 described panel-form loudspeakers, it is characterized in that described reflector comprises the light plate of a rigidity, between its top layer, accompany the core of porous.
4. according to the described panel-form loudspeakers of claim 3, it is characterized in that, the described plate of a frame support, described plate is connected to described framework through a resilient suspension.
5. according to the described panel-form loudspeakers of claim 4, it is characterized in that described framework surrounds described plate, and described suspension is connected the edge of described plate.
6. according to the described panel-form loudspeakers of above-mentioned arbitrary claim, it is characterized in that described first and second transducer fully also is installed on the described reflector exclusively.
7. according to the described panel-form loudspeakers of above-mentioned arbitrary claim, it is characterized in that one of described transducer is an electromagnetic type.
8. according to the described panel-form loudspeakers of claim 7, it is characterized in that one of described transducer is a piezoelectric type.
9. according to the described panel-form loudspeakers of above-mentioned arbitrary claim, it is characterized in that, one second distributed acoustic reflector is installed on described first acoustic transmitter or wherein, one resilient suspension connects described first and second reflectors, described first transducer fully also is installed on first reflector exclusively, and described second transducer fully also is installed on second reflector exclusively.
10. according to the described panel-form loudspeakers of claim 9, it is characterized in that described second reflector is installed in the hole of described first reflector.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9517918.0 | 1995-09-02 | ||
| GBGB9517918.0A GB9517918D0 (en) | 1995-09-02 | 1995-09-02 | Acoustic device |
| GBGB9522281.6A GB9522281D0 (en) | 1995-10-31 | 1995-10-31 | Acoustic device |
| GB9522281.6 | 1995-10-31 | ||
| GB9606836.6 | 1996-03-30 | ||
| GBGB9606836.6A GB9606836D0 (en) | 1996-03-30 | 1996-03-30 | Acoustic device |
| PCT/GB1996/002162 WO1997009846A1 (en) | 1995-09-02 | 1996-09-02 | Panel-form loudspeakers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1195458A true CN1195458A (en) | 1998-10-07 |
Family
ID=34865248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96196710.2A Pending CN1195458A (en) | 1995-09-02 | 1996-09-02 | Panel-form loudspeakers |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0847665B1 (en) |
| JP (1) | JPH11512257A (en) |
| CN (1) | CN1195458A (en) |
| AT (1) | ATE179296T1 (en) |
| AU (1) | AU703122B2 (en) |
| CA (1) | CA2230461A1 (en) |
| DE (1) | DE69602203T2 (en) |
| DK (1) | DK0847665T3 (en) |
| EA (1) | EA001720B1 (en) |
| ES (1) | ES2132953T3 (en) |
| HK (1) | HK1008649A1 (en) |
| RO (1) | RO119045B1 (en) |
| WO (1) | WO1997009846A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658318A (en) * | 2017-01-20 | 2017-05-10 | 瑞声科技（南京）有限公司 | Vibration sound production system |
Families Citing this family (43)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2273025A1 (en) * | 1996-12-20 | 1998-07-02 | Nct Group, Inc. | Electroacoustic transducers comprising vibrating panels |
| GB9709959D0 (en) * | 1997-05-15 | 1997-07-09 | New Transducers Ltd | Panel-form loudspeakers |
| US6278790B1 (en) | 1997-11-11 | 2001-08-21 | Nct Group, Inc. | Electroacoustic transducers comprising vibrating panels |
| RO121307B1 (en) | 1998-06-22 | 2007-02-28 | Slab Technology Limited | Loudspeaker |
| JP3512087B2 (en) | 1999-06-15 | 2004-03-29 | 日本電気株式会社 | Panel speaker |
| TW511391B (en) | 2000-01-24 | 2002-11-21 | New Transducers Ltd | Transducer |
| US6865277B2 (en) | 2000-01-27 | 2005-03-08 | New Transducers Limited | Passenger vehicle |
| US7151837B2 (en) | 2000-01-27 | 2006-12-19 | New Transducers Limited | Loudspeaker |
| US6839444B2 (en) | 2000-11-30 | 2005-01-04 | New Transducers Limited | Loudspeakers |
| GB0029098D0 (en) * | 2000-11-30 | 2001-01-10 | New Transducers Ltd | Vibration transducer |
| US11431312B2 (en) | 2004-08-10 | 2022-08-30 | Bongiovi Acoustics Llc | System and method for digital signal processing |
| US8284955B2 (en) | 2006-02-07 | 2012-10-09 | Bongiovi Acoustics Llc | System and method for digital signal processing |
| US10158337B2 (en) | 2004-08-10 | 2018-12-18 | Bongiovi Acoustics Llc | System and method for digital signal processing |
| US10848118B2 (en) | 2004-08-10 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
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-
1996
- 1996-09-02 DE DE69602203T patent/DE69602203T2/en not_active Expired - Fee Related
- 1996-09-02 AT AT96929403T patent/ATE179296T1/en not_active IP Right Cessation
- 1996-09-02 CA CA002230461A patent/CA2230461A1/en not_active Abandoned
- 1996-09-02 DK DK96929403T patent/DK0847665T3/en active
- 1996-09-02 CN CN96196710.2A patent/CN1195458A/en active Pending
- 1996-09-02 ES ES96929403T patent/ES2132953T3/en not_active Expired - Lifetime
- 1996-09-02 JP JP9510963A patent/JPH11512257A/en active Pending
- 1996-09-02 EP EP96929403A patent/EP0847665B1/en not_active Expired - Lifetime
- 1996-09-02 AU AU68818/96A patent/AU703122B2/en not_active Ceased
- 1996-09-02 EA EA199800172A patent/EA001720B1/en not_active IP Right Cessation
- 1996-09-02 WO PCT/GB1996/002162 patent/WO1997009846A1/en not_active Application Discontinuation
- 1996-09-02 RO RO98-00641A patent/RO119045B1/en unknown
-
1998
- 1998-07-28 HK HK98109454A patent/HK1008649A1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658318A (en) * | 2017-01-20 | 2017-05-10 | 瑞声科技（南京）有限公司 | Vibration sound production system |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1008649A1 (en) | 1999-05-14 |
| EP0847665A1 (en) | 1998-06-17 |
| RO119045B1 (en) | 2004-02-27 |
| CA2230461A1 (en) | 1997-03-13 |
| AU6881896A (en) | 1997-03-27 |
| EP0847665B1 (en) | 1999-04-21 |
| ES2132953T3 (en) | 1999-08-16 |
| EA199800172A1 (en) | 1998-10-29 |
| ATE179296T1 (en) | 1999-05-15 |
| DK0847665T3 (en) | 1999-10-25 |
| DE69602203D1 (en) | 1999-05-27 |
| JPH11512257A (en) | 1999-10-19 |
| DE69602203T2 (en) | 1999-09-16 |
| AU703122B2 (en) | 1999-03-18 |
| WO1997009846A1 (en) | 1997-03-13 |
| EA001720B1 (en) | 2001-08-27 |
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