EP0847670B1 - Ecrans de presentation comprenant des haut-parleurs - Google Patents

Ecrans de presentation comprenant des haut-parleurs Download PDF

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Publication number
EP0847670B1
EP0847670B1 EP96929386A EP96929386A EP0847670B1 EP 0847670 B1 EP0847670 B1 EP 0847670B1 EP 96929386 A EP96929386 A EP 96929386A EP 96929386 A EP96929386 A EP 96929386A EP 0847670 B1 EP0847670 B1 EP 0847670B1
Authority
EP
European Patent Office
Prior art keywords
panel
display screen
screen according
area
acoustic
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
Application number
EP96929386A
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German (de)
English (en)
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EP0847670A1 (fr
Inventor
Henry Azima
Martin Colloms
Neil Harris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority claimed from GBGB9517918.0A external-priority patent/GB9517918D0/en
Priority claimed from GBGB9522281.6A external-priority patent/GB9522281D0/en
Priority claimed from GBGB9606836.6A external-priority patent/GB9606836D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP0847670A1 publication Critical patent/EP0847670A1/fr
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Publication of EP0847670B1 publication Critical patent/EP0847670B1/fr
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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
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

  • the invention relates to display screens and more particularly, but not exclusively, to projection screens.
  • US-A-5,025,474 of MATSUSHITA discloses a projection screen/loudspeaker combinatin in which the loudspeaker comprises a box-like enclosure formed with ports so that the loudspeaker operates as a bass-reflex speaker to enhance its low frequency performance.
  • Embodiments of the present invention use members of nature, structure and configuration achievable generally and/or specifically by implementing teachings of our co-pending PCT publication No. WO97/09842 of even date herewith.
  • Such members thus have capability to sustain and propagate input vibrational energy by bending waves in operative area(s) extending transversely of thickness often but not necessarily to edges of the member(s); are configured with or without anisotropy of bending stiffness to have resonant mode vibration components distributed over said area(s) beneficially for acoustic coupling with ambient air; and have predetermined preferential locations or sites within said area for transducer means, particularly operationally active or moving part(s) thereof effective in relation to acoustic vibrational activity in said area(s) and signals, usually electrical, corresponding to acoustic content of such vibrational activity.
  • This invention is particularly concerned with display screens incorporating acoustic devices e.g. in the form of loudspeakers.
  • the invention is a display screen comprising a panel having a light reflective or light emitting surface, characterised in that the screen comprises a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for transducer means and having a transducer mounted wholly and exclusively on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating.
  • the radiator may comprise a stiff lightweight panel having a cellular core sandwiched between a pair of high modulus skins.
  • the cellular core may be of honeycomb aluminium foil.
  • the skins may be of fibre reinforced plastics.
  • the display screen may comprise a frame surrounding the panel.
  • a resilient suspension may mount the panel in the frame.
  • Panel-form loudspeakers may be attached to opposite sides of the frame to provide left and right hand channel information.
  • the left and right hand loudspeakers may be hinged on the frame to be foldable against the radiator (2) for storage.
  • the left and right hand loudspeakers may each comprise a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said an least one area and have predetermined preferential locations or sites within said area for transducer means and having a transducer mounted wholly and exclusively on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating.
  • the screen may be a projection screen.
  • the audio visuai apparatus may comprise at least one rear channel loudspeaker comprising a member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for transducer means and having a transducer mounted wholly and exclusively on said member at one of said locations or sites to vibrate the member to cause it to resonate forming an acoustic radiator which provides an acoustic output when resonating.
  • a panel-form loudspeaker (81) of the kind described and claimed in our co-pending International publication No. W097/09842 of even date herewith comprising a rectangular frame (1) carrying a resilient suspension (3) round its inner periphery which supports a distributed mode sound radiating panel (2).
  • a transducer (9) e.g as described in detail with reference to our co-pending International publication Nos. WO97/09859, WO97/09861, WO97/09858 of even date herewith, is mounted wholly and exclusively on or in the panel (2) at a predetermined location defined by dimensions x and y the position of which location is calculated as described in our co-pending International publication No. W097/09842 of even date herewith, to launch bending waves into the panel to cause the panel to resonate to radiate an acoustic output.
  • the transducer (9) is driven by a signal amplifier (10), e.g. an audio amplifier, connected to the transducer by conductors (28).
  • a signal amplifier (10) e.g. an audio amplifier
  • Amplifier loading and power requirements can be entirely normal, similar to conventional cone type speakers, sensitivity being of the order of 86 - 88dB/watt under room loaded conditions.
  • Amplifier load impedance is largely resistive at 6 ohms, power handling 20-80 watts. Where the panel core and/or skins are of metal, they may be made to act as a heat sink for the transducer to remove heat from the motor coil of the transducer and thus improve power handling.
  • Figures 2 a and 2 b are partial typical cross-sections through the loudspeaker (81) of Figure 1.
  • Figure 2 a shows that the frame (1), surround (3) and panel (2) are connected together by respective adhesive-bonded joints (20).
  • Suitable materials for the frame include lightweight framing, e.g. picture framing of extruded metal e.g. aluminium alloy or plastics.
  • Suitable surround materials include resilient materials such as foam rubber and foam plastics.
  • Suitable adhesives for the joints (20) include epoxy, acrylic and cyano-acrylate etc. adhesives.
  • Figure 2 b illustrates, to an enlarged scale, that the panel (2) is a rigid lightweight panel having a core (22) e.g. of a rigid plastics foam (97) e.g. cross linked polyvinylchloride or a cellular matrix (98) i.e. a honeycomb matrix of metal foil, plastics or the like, with the cells extending transversely to the plane of the panel, and enclosed by opposed skins (21) e.g. of paper, card, plastics or metal foil or sheet.
  • the skins are of plastics, they may be reinforced with fibres e.g. of carbon, glass, Kevlar (RTM) or the like in a manner known per se to increase their modulus.
  • RTM Kevlar
  • Envisaged skin layer materials and reinforcements thus include carbon, glass, Kevlar (RTM), Nomex (RTM) i.e. aramid etc. fibres in various lays and weaves, as well as paper, bonded paper laminates, melamine, and various synthetic plastics films of high modulus, such as Mylar (RTM), Kaptan (RTM), polycarbonate, phenolic, polyester or related plastics, and fibre reinforced plastics, etc. and metal sheet or foil.
  • Investigation of the Vectra grade of liquid crystal polymer thermoplastics shows that they may be useful for the injection moulding of ultra thin skins or shells of smaller size, say up to around 30cm diameter. This material self forms an orientated crystal structure in the direction of injection, a preferred orientation for the good propagation of treble energy from the driving point to the panel perimeter.
  • thermoplastics allow for the mould tooling to carry location and registration features such as grooves or rings for the accurate location of transducer parts e.g. the motor coil, and the magnet suspension. Additional with some weaker core materials it is calculated that it would be advantageous to increase the skin thickness locally e.g. in an area or annulus up to 150% of the transducer diameter, to reinforce that area and beneficially couple vibration energy into the panel. High frequency response will be improved with the softer foam materials by this means.
  • Envisaged core layer materials include fabricated honeycombs or corrugations of aluminium alloy sheet or foil, or Kevlar (RTM), Nomex (RTM), plain or bonded papers, and various synthetic plastics films, as well as expanded or foamed plastics or pulp materials, even aerogel metals if of suitably low density.
  • Some suitable core layer materials effectively exhibit usable self-skinning in their manufacture and/or otherwise have enough inherent stiffness for use without lamination between skin layers.
  • a high performance cellular core material is known under the trade name 'Rohacell' which may be suitable as a radiator panel and which is without skins. In practical terms, the aim is for an overall lightness and stiffness suited to a particular purpose, specifically including optimising contributions from core and skin layers and transitions between them.
  • piezo and electro dynamic transducers have negligible electromagnetic radiation or stray magnet fields.
  • Conventional speakers have a large magnetic field, up to 1 metre distant unless specific compensation counter measures are taken.
  • electrical connection can be made to the conductive parts of an appropriate DML panel or an electrically conductive foam or similar interface may be used for the edge mounting.
  • the suspension (3) may damp the edges of the panel (2) to prevent excessive edge movement of the panel. Additionally or alternatively, further damping may be applied, e.g. as patches, bonded to the panel in selected positions to damp excessive movement to distribute resonance equally over the panel.
  • the patches may be of bitumen-based material, as commonly used in conventional loudspeaker enclosures or may be of a resilient or rigid polymeric sheet material. Some materials, notably paper and card, and some cores may be self-damping. Where desired, the damping may be increased in the construction of the panels by employing resiliently setting, rather than rigid setting adhesives.
  • Effective said selective damping includes specific application to the panel including its sheet material of means permanently associated therewith. Edges and corners can be particularly significant for dominant and less dispersed low frequency vibration modes of panels hereof. Edge-wise fixing of damping means can usefully lead to a panel with its said sheet material fully framed, though their corners can often be relatively free, say for desired extension to lower frequency operation. Attachment can be by adhesive or self-adhesive materials. Other forms of useful damping, particularly in terms of more subtle effects and/or mid- and higher frequencies can be by way of suitable mass or masses affixed to the sheet material at predetermined effective medial localised positions of said area.
  • An acoustic panel as described above is bidirectional.
  • the sound energy from the back is not strongly phase related to that from the front. Consequently there is the benefit of overall summation of acoustic power in the room, sound energy of uniform frequency distribution, reduced reflective and standing wave effects and with the advantage of superior reproduction of the natural space and ambience in the reproduced sound recordings.
  • Figure 3 illustrates a multi-media audio-visual system comprising a moving picture projector (31) arranged to project an image onto a projection screen formed by a loudspeaker panel (32) of the kind shown in Figures 1 and 2.
  • the loudspeaker/projection screen (32) comprises a panel (2) having aluminium or carbon fibre reinforced skins (21) sandwiching a honeycomb core (22) of aluminium foil.
  • the composite may be secured together using any epoxy adhesive.
  • the thickness of the aluminium skins may be 300 microns.
  • the core thickness may be 11mm and the cell size of honeycomb may be 9.5mm.
  • Such a panel is stiff, of low density, high modulus and is isotropic.
  • a pair of smaller subsidiary loudspeakers (114) of the kind described in Figures 1 and 2 are hinged on opposite sides of the centre channel loudspeaker panel (32) by means of hinges (34) whereby the subsidiary panels can be hinged against the primary panel (32) when not in use and can be moved into the position as illustrated for use.
  • the subsidiary panels (114) are arranged to receive and radiate respective left and right hand channel information, e.g. for stereo operation.
  • the subsidiary loudspeakers (114) may comprise panels (2) having skins (21) of aluminium foil, or carbon fibre or glass fibre reinforced plastics.
  • a decorative film, e.g. of polyester may be applied over one or both of the skins.
  • the core (22) of the panels (114) may be of aluminium foil, e.g. in a honeycomb cell arrangement, or may be of paper cells. Where paper is employed it may be impregnated with a plastics material such as a phenolic compound to improve the stiffness of the paper.
  • the cell size may be in the range 3 to 6mm and the core thickness may be of the order of 3 to 10mm.
  • the skins are of aluminium foil they may be 25 to 100 microns in thickness.
  • An epoxy adhesive may be used to assemble the panel.
  • Stereo i.e. two channel sound reproduction, involves the creation of sound stage illusion containing the properties of source location, perspective and the ambience of the original recording.
  • Stereo with conventional speakers is strong on aspects of phantom source location and in some cases perspective, but is weaker in respect of the expression of natural space and ambience. This is because the near point source nature of conventional pistonic speakers makes it easy aurally to identify their physical location, which in conflict with the desire for overall stereo image localisation.
  • the embodiment of Figure 3 employs a pair of acoustic panel speakers for left and right channels which are set in complex vibration over the whole surface over a wide frequency range typically 100Hz to 20kHz.
  • the primary loudspeaker panel (32) is shown suspended on suspension means (33) but alternatively the panel may be supported e.g. on a floor stand.
  • FIG 5 shows how the projection apparatus of the present invention may be arranged in a room (145) equipped with seating (146).
  • the apparatus has a projector (31) projecting an image onto the screen (32) and also includes a pair of subwoofers (35), which may be of conventional construction, at the sides of the room to improve bass audio extension and a pair of rear effect loudspeakers (117) i.e. so-called ambience speakers, at the rear of the room.
  • the rear speakers (117) are also of the kind shown in Figures 1 and 2 in view of their wide and even sound dispersion characteristics.
  • the rear effect loudspeakers may be of the same construction as the subsidiary loudspeakers (114).
  • a panel loudspeaker according to Figures 1 and 2 has remarkable non directional properties.
  • the energy must be widely distributed, ideally from non directional sources. It is important that the sound source is not well localised otherwise the perception of a large ambient space, the simulated acoustic region behind the listener, is unsatisfactory.
  • Hitherto conventional directional and/or small source speakers are used for ambience reproduction. Due to the intensity phenomenon of aural perception, audience members seated closer to a nearby ambience speaker find their perception strongly localised on that speaker greatly impairing the ambience effect and their whole appreciation of the multichannel sound field. The localisation may be so powerful that aural attention is drawn away from the primary front stage sound channels this working in conjunction with the Haas effect which reinforces the localisation to proximate sources.
  • An ambience reproducing system built with one or more loudspeakers according to Figures 1 and 2 deliver a large sound field or near uniform intensity which has deliberately poor localisation.
  • a large audience may be handled, even with some persons in close proximity (as near as 0.5m) to the panel loudspeakers without any significant localisation of the immediate reproducing channel and with the vital property of an unimpaired aural perception of the important front channels.
  • Greatly improved realism is achieved for the multi-channel sound reproducing system as a whole as a result of the desirable radiating characteristics of the acoustic panel sound reproducer.
  • the ambience loudspeakers may if desired be suspended on wires and disguised, by the application of a suitable image to the panel (2) to resemble pictures.
  • Figure 4 shows how the frames (1) of the projection/loudspeaker panel may be formed with a return lip (36) whereby the suspension (3) can be concealed.
  • the frames of the subsidiary loudspeakers (114) and the ambience loudspeakers (117) may be similarly formed.
  • acoustic panel build to sufficient size to serve as a projection screen for still, film and video images is thus simultaneously a sound reproducer for example for the centre or dialogue channel of home theatre.
  • acoustic panels according to the present invention of good size say over 0.6m wide, provide very good sound coverage for audiences.
  • Working demonstrations have shown high intelligibility and sound clarity over the whole audience region with a major advantage that persons nearest to the screen do not suffer blasting from excessive proximate sound levels, invariably a flaw of conventional direct radiating cone based speakers.
  • a projection screen of the invention there is a second and unique aspect of a projection screen of the invention.
  • the ear With conventional centre channel speakers the ear is easily capable of locating the acoustic centre of the speaker. All sounds appear to come from this concentrated small source, detracting from the sense of realism.
  • the acoustic panel With the acoustic panel, its uniquely nondirectional radiation property means that the sound appears to come from the general acoustic region of the screen but not from one isolated point.
  • the image is combined with sound on the panel, there is a powerful synaesthetic effect.
  • the desirable lack of specific sound source localisation allows the ear/brain sensing combination freely to associate an imagined, virtual and approximate location for the sound sources, synchronised with the locations presented by the visual image on the acoustic surface.

Claims (12)

  1. Un écran de visualisation (32) comprenant un panneau (2) ayant une surface réfléchissant la lumière ou émettant de la lumière, caractérisé en ce que l'écran comprend un élément (2) ayant la possibilité d'entretenir et de faire propager de l'énergie vibratoire d'entrée, par des ondes de flexion, dans au moins une zone active s'étendant transversalement à l'épaisseur, pour avoir des composantes de vibration de mode résonnant réparties sur la zone précitée, et pour avoir des emplacements ou des sites préférentiels prédéterminés à l'intérieur de cette zone pour des moyens à transducteur, et ayant un transducteur (9) monté complètement et exclusivement sur l'élément, à l'un des emplacements ou des sites, pour faire vibrer de l'élément de façon qu'il résonne en formant un radiateur acoustique qui produit une émission acoustique lorsqu'il résonne.
  2. Un écran de visualisation selon la revendication 1, caractérisé en ce que le radiateur (2) comprend un panneau léger et rigide ayant une âme cellulaire (22) intercalée entre une paire de peaux (21) à module élevé.
  3. Un écran de visualisation selon la revendication 2, caractérisé par un cadre (11) entourant le panneau.
  4. Un écran de visualisation selon la revendication 3, caractérisé par une suspension élastique (3) assurant le montage du panneau dans le cadre.
  5. Un écran de visualisation selon l'une quelconque des revendications 2 à 4, caractérisé en ce que l'âme cellulaire (22) est en feuille d'aluminium (98) à structure en nid d'abeilles.
  6. Un écran de visualisation selon l'une quelconque des revendications 2 à 5, caractérisé en ce que les peaux (21) sont en matière plastique armée de fibres.
  7. Un écran de visualisation selon l'une quelconque des revendications précédentes lorsqu'elle est rattachée à la revendication 3, caractérisé par des haut-parleurs (114) en forme de panneau fixés sur des côtés opposés du cadre (1) pour fournir de l'information de voies gauche et droite.
  8. Un écran de visualisation selon la revendication 7, caractérisé en ce que les haut-parleurs (114) gauche et droit sont articulés sur le cadre (1) pour pouvoir être repliés contre le radiateur (2) pour le rangement.
  9. Un écran de visualisation selon la revendication 7 ou la revendication 8, caractérisé en ce que chacun des haut-parleurs gauche et droit (114) comprend un élément (2) ayant la possibilité d'entretenir et de faire propager de l'énergie vibratoire d'entrée, par des ondes de flexion, dans au moins une zone active s'étendant transversalement à l'épaisseur, pour avoir des composantes de vibration de mode résonnant réparties sur la zone précitée, et pour avoir des emplacements ou des sites préférentiels prédéterminés à l'intérieur de cette zone pour des moyens à transducteur, et ayant un transducteur (9) monté complètement et exclusivement sur l'élément à l'un des emplacements ou des sites pour faire vibrer l'élément de façon qu'il résonne en formant un radiateur acoustique qui produit une émission acoustique lorsqu'il résonne.
  10. Un écran de visualisation selon l'une quelconque des revendications précédentes, caractérisé en ce que l'écran (2) est un écran de projection.
  11. Appareil audiovisuel caractérisé par un écran de projection (32) selon la revendication 10.
  12. Appareil audiovisuel selon la revendication 11, caractérisé par au moins un haut-parleur de voie arrière (117) comprenant un élément (2) ayant la possibilité d'entretenir et de faire propager de l'énergie vibratoire d'entrée, par des ondes de flexion, dans au moins une zone s'étendant transversalement à l'épaisseur, pour avoir des composantes de vibration de mode résonnant réparties sur la zone précitée, et pour avoir des emplacements ou des sites préférentiels prédéterminés à l'intérieur de cette zone pour des moyens à transducteur, et ayant un transducteur (9) monté complètement et exclusivement sur l'élément à l'un des emplacements ou des sites, pour faire vibrer l'élément de façon qu'il résonne en formant un radiateur acoustique qui produit une émission acoustique lorsqu'il résonne.
EP96929386A 1995-09-02 1996-09-02 Ecrans de presentation comprenant des haut-parleurs Expired - Lifetime EP0847670B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GB9517918 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 1995-10-31
GBGB9606836.6A GB9606836D0 (en) 1996-03-30 1996-03-30 Acoustic device
GB9606836 1996-03-30
PCT/GB1996/002137 WO1997009853A2 (fr) 1995-09-02 1996-09-02 Ecrans de presentation comprenant des haut-parleurs

Publications (2)

Publication Number Publication Date
EP0847670A1 EP0847670A1 (fr) 1998-06-17
EP0847670B1 true EP0847670B1 (fr) 1999-03-10

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EP96929386A Expired - Lifetime EP0847670B1 (fr) 1995-09-02 1996-09-02 Ecrans de presentation comprenant des haut-parleurs

Country Status (21)

Country Link
EP (1) EP0847670B1 (fr)
JP (1) JPH11512245A (fr)
CN (1) CN1195461A (fr)
AT (1) ATE177579T1 (fr)
AU (1) AU702865B2 (fr)
BR (1) BR9610553A (fr)
CA (1) CA2234944A1 (fr)
CZ (1) CZ58598A3 (fr)
DE (1) DE69601729T2 (fr)
DK (1) DK0847670T3 (fr)
EA (1) EA000619B1 (fr)
ES (1) ES2130845T3 (fr)
HK (1) HK1008646A1 (fr)
HU (1) HUP9901396A3 (fr)
IL (1) IL123486A (fr)
NZ (1) NZ316543A (fr)
PL (1) PL325235A1 (fr)
RO (1) RO119050B1 (fr)
SK (1) SK26698A3 (fr)
TR (1) TR199800362T1 (fr)
WO (1) WO1997009853A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984659A2 (fr) * 1998-09-04 2000-03-08 Harman Audio Electronic Systems GmbH Panneau acoustique
DE102004032223A1 (de) * 2004-07-02 2006-01-19 Siemens Ag Audiovisuelle Anordnung
DE102005058175A1 (de) * 2005-12-05 2007-06-06 Volkswagen Ag Lautsprecheranordnung zur Beschallung in einem Kraftfahrzeug

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GB9709969D0 (en) * 1997-05-17 1997-07-09 New Transducers Ltd An acoustic object
DE19821624A1 (de) * 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Projektionswand
CZ20004748A3 (cs) 1998-06-22 2001-12-12 Slab Technology Limited Reproduktory
US6304435B1 (en) 1998-11-12 2001-10-16 Acer Incorporated Laptop computer with flat panel speakers
US6911901B2 (en) 2000-12-20 2005-06-28 New Transducers Limited Multi-functional vibro-acoustic device
DE20114680U1 (de) * 2001-09-06 2003-01-16 G & B Pronova Gmbh Projektionsschirm
FR2853802B1 (fr) * 2003-04-11 2005-06-24 Pierre Denis Rene Vincent Installation pour la projection d'oeuvres cinematographiques ou numeriques sonores
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
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EP0847670A1 (fr) 1998-06-17
DK0847670T3 (da) 1999-09-27
WO1997009853A3 (fr) 1997-04-03
HK1008646A1 (en) 1999-05-14
AU702865B2 (en) 1999-03-11
JPH11512245A (ja) 1999-10-19
DE69601729D1 (de) 1999-04-15
TR199800362T1 (xx) 1998-05-21
CA2234944A1 (fr) 1997-03-13
AU6880196A (en) 1997-03-27
ATE177579T1 (de) 1999-03-15
IL123486A0 (en) 1998-09-24
ES2130845T3 (es) 1999-07-01
PL325235A1 (en) 1998-07-06
CN1195461A (zh) 1998-10-07
IL123486A (en) 2000-10-31
SK26698A3 (en) 1998-09-09
CZ58598A3 (cs) 1998-08-12
BR9610553A (pt) 1999-12-21
DE69601729T2 (de) 1999-09-16
EA199800260A1 (ru) 1998-08-27
WO1997009853A2 (fr) 1997-03-13
NZ316543A (en) 1998-10-28
RO119050B1 (ro) 2004-02-27
HUP9901396A3 (en) 2002-02-28
EA000619B1 (ru) 1999-12-29
HUP9901396A2 (hu) 1999-08-30

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