EA000619B1 - Display screens incorporating loudspeakers - Google Patents

Display screens incorporating loudspeakers Download PDF

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Publication number
EA000619B1
EA000619B1 EA199800260A EA199800260A EA000619B1 EA 000619 B1 EA000619 B1 EA 000619B1 EA 199800260 A EA199800260 A EA 199800260A EA 199800260 A EA199800260 A EA 199800260A EA 000619 B1 EA000619 B1 EA 000619B1
Authority
EA
Eurasian Patent Office
Prior art keywords
screen according
characterised
characterized
panel
display screen
Prior art date
Application number
EA199800260A
Other languages
Russian (ru)
Other versions
EA199800260A1 (en
Inventor
Генри Азима
Мартин Колломз
Нейл Харрис
Original Assignee
Нью Трэнсдьюсерз Лимитед
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
Family has litigation
Priority to GBGB9517918.0A priority Critical patent/GB9517918D0/en
Priority to GBGB9522281.6A priority patent/GB9522281D0/en
Priority to GBGB9606836.6A priority patent/GB9606836D0/en
Application filed by Нью Трэнсдьюсерз Лимитед filed Critical Нью Трэнсдьюсерз Лимитед
Priority to PCT/GB1996/002137 priority patent/WO1997009853A2/en
Publication of EA199800260A1 publication Critical patent/EA199800260A1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34865232&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EA000619(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EA000619B1 publication Critical patent/EA000619B1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/045Plane 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/02Spatial or constructional arrangements of loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/06Plane diaphragms comprising a plurality of sections or layers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00Details 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
    • H04R2307/029Diaphragms comprising fibres
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/15Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Abstract

1. A display screen (32) having a t light reflective or light emitting surface, characterised in that the screen comprises a member (2) 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 (9) 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. 2. A display screen according to Claim 1, characterised in that the radiator (2) comprises a stiff lightweight panel having a cellular core (22) sandwiched between a pair of high modulus skins (21). 3. A display screen according to Claim 2, characterised by a frame (11) surrounding the panel. 4. A display screen according to Claim 3, characterised by a resilient suspension (3) mounting the panel in the frame. 5. A display screen according to any one of Claim 2 to 4, characterised in that the cellular core (22) is of honeycomb aluminium foil (98). 6. A display screen according to any one of Claims 2 to 5, characterised in that the skins (21) are of fibre reinforced plastics. 7. A display screen according to any preceding Claim 3, characterised by panel-form loudspeakers (114) attached to opposite sides of the frame (1) to provide left and right hand channel information. 8. A display screen according to Claim 1, characterised in that the left and right hand loudspeakers (114) are hinged on the frame (1) to be foldable against the screen. 9. A display screen according to Claim 7 or Claim 8, characterised in that the left and right hand loudspeakers (114) each comprise a member (2) 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 (9) 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. 10. A display screen according to any preceding Claim, characterised in that the screen (2) is a projection screen. 11. Audio visual apparatus characterised by a projection screen (32) as claimed in Claim 10. 12 Audio visual apparatus according to Claim 11, characterised by at least one rear channel loudspeaker comprising a member (2) 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 (9) 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.

Description

FIELD OF THE INVENTION

The invention relates to demonstration screens and, in particular, but not exclusively, to projection screens.

State of the art

From UK application Laid-Open No. 2262861, a panel-shaped loudspeaker is known comprising a resonant multi-mode radiating element in the form of an integral panel of a multilayer structure formed from two shells of material with a spacing core of a transverse cellular structure, wherein the panel has a hard bending ratio (B) in all directions to power in a cube of panel mass per unit surface area (μ) equal to at least 10;

fastening means that supports the panel or attaches to it a supporting body in a free, undamped manner; and an electromechanical drive means connected to the panel, which serves to excite multi-mode resonance in the sound-emitting panel in response to the supply to the loudspeaker of an electrical input signal within its operating frequency band.

US Pat. No. 5,025,474 describes a combination of a projection screen and a loudspeaker in which the loudspeaker comprises a box-shaped housing in which there are openings so that the loudspeaker functions as a reflective bass of the loudspeaker to improve low-frequency performance.

US Pat. No. 3,247,925 describes an essentially low frequency resonant panel loudspeaker mounted on a chassis and driven by an electromechanical converter mounted on the chassis.

Disclosure of invention

Embodiments of the present invention utilize elements, by nature, structure and configuration, achieved in general and / or, in particular, by implementing the ideas described in our concurrently published international patent application, publication WO 97/09842. Thus, such elements have the ability to support and propagate the input vibrational energy through bending waves in the operative region (s), extending across the thickness often, but not necessarily, to the edges of the element (s); configured with or without anisotropy of bending stiffness in order to have an advantageous distribution of the resonant mode vibrational components over said region (s) for acoustic coupling with ambient air; and have predetermined preferred regions or locations within said region for transducer means, in particular, operatively active or moving part (s) thereof, effective with respect to acoustic vibrational activity in said region (s) and signals, usually electric, corresponding to the acoustic content of such vibrational activity . The simultaneously pending published international patent application publication WO 97/09842 foresees the use of such elements either in passive acoustic devices without converting means, used for reverb or for acoustic filtering, or for acoustic sounding of a space or room; or in active acoustic devices with converting means, such as sound sources or loudspeakers of a wide variety, when they supply input signals that must be converted to the said sound, or such as microphones exposed to sound that must be converted to other signals.

In particular, the present invention relates to demonstration screens comprising acoustic devices, for example, in the form of speakers.

The elements mentioned above are referred to herein as distributed-mode acoustic emitters and are intended to be characterized as in the aforementioned international patent application and / or otherwise, as specifically presented herein.

A demonstration screen is claimed comprising a panel having a reflective or light emitting surface, characterized in that the screen contains an element having the ability to support and propagate the input vibrational energy through bending waves in at least one operative region extending across the thickness in order to have vibrational components of the resonant mode distributed over said at least one region and having predetermined preferred regions or locations inside omyanutoy area for transducer means and a transducer mounted wholly and exclusively on said member at one of said locations or sites to report to its oscillation element resonating forming an acoustic radiator which provides an acoustic output when resonating. The emitter may contain a rigid lightweight light emitting panel having a honeycomb core enclosed between two high modulus shells. The cellular core may be made of honeycomb aluminum foil. Shells may be made of fiber-reinforced plastics. The display screen may comprise a frame surrounding the panel. The panel in the frame can be fixed by elastic bordering the suspension. Panel-shaped speakers can be attached to opposite sides of the frame to provide left and right channel information. Left and right speakers can be hinged on the frame to allow folding in front of the emitter (2) for storage. Each of the left and right loudspeakers contains an element having the ability to support and propagate the input vibrational energy by means of bending waves in at least one operative region extending across the thickness in order to have vibrational components of the resonant mode distributed over said at least , one area and having predetermined preferred sections or by a location inside said area for converting means and has a converter installed entirely and exclusively on said element at one of said sections or locations for communicating the oscillation to the element for resonating it, forming an acoustic emitter that provides an acoustic output signal upon resonance. The screen may be a projection.

An audiovisual device with a projection screen is also available. The device may comprise at least one rear channel loudspeaker comprising an element having the ability to support and propagate the input vibrational energy by means of bending waves in at least one operative region extending across the thickness in order to have vibrational components of the resonant mode, distributed over said at least one region and having predetermined preferred portions or locations within said region for converting means and it has a transducer mounted entirely and exclusively on said element at one of the mentioned sections or locations for oscillating the element for its resonance, forming an acoustic emitter that provides an acoustic output signal during resonance.

Brief Description of the Drawings

The invention is schematically illustrated by way of example in the accompanying drawings, in which FIG. 1 is a diagram showing a distributed mode speaker as described and claimed in our simultaneously pending published international patent application, publication WO 97/09842;

FIG. 2a is a partial section along line AA in FIG. one ;

FIG. 2b is an enlarged cross-sectional view of a distributed mode emitter of the type shown in FIG. 2a and showing two alternative designs;

FIG. 3 is a perspective view of an embodiment of the proposed projection screen;

FIG. 4 is a partial view of a detail of the screen of FIG. 3 and FIG. 5 is a top view of a room with a projection screen located therein, shown in FIG. 3.

Best Mode for Carrying Out the Invention

Referring to FIG. 1 of the drawings, it shows a panel-shaped loudspeaker of the type 81 described and claimed in our simultaneously pending published international patent application WO 97/09842, comprising a rectangular frame 1, bearing an elastic border 3 around its inner periphery, which supports the sound-emitting panel 2 in a distributed mode. The transducer 9, for example, as described in detail in our simultaneously considered published international applications, publications WO 97/09859, WO 97/09861, WO 97/09858, is installed entirely and exclusively on or in the sound-emitting panel 2 at a predetermined location defined by the X coordinates and Y, the position of which is calculated as described in our publication of international patent application WO 97/09842 for driving bending waves into a sound-emitting panel in order to cause its resonance to study the acoustic output signal.

The converter 9 is driven by a signal amplifier 1 0, for example, an audio frequency amplifier connected to the converter by conductors 28. The requirements for the load and power of the amplifier can be generally normal, similar to the requirements for conventional cone speakers, the sensitivity is about 86-88 dB / W under room load conditions. The load impedance of the amplifier is mainly resistive at 6 ohms, power control within 20-80 watts.

In the case of manufacturing the core of the sound emitting panel and / or the sheath of metal, they can be made to function as a heat sink for the converter to remove heat from the converter motor coil and thereby improve power control.

In FIG. 2a and 2b show partial conventional cross-sections of the loudspeaker 81 of FIG. one . In FIG. 2 a shows that the frame 1, the border 3 and the sound-emitting panel 2 are connected to each other by means of corresponding adhesive joints 20. Suitable materials for the frame are lightweight materials, for example, used to frame paintings made from extruded metal, for example, aluminum alloy or plastic. Suitable edging materials are resilient materials such as porous rubber and porous plastic. Suitable adhesives for compound 20 are epoxy, acrylic and cyanoacrylic and the like.

FIG. 2b illustrates on an enlarged scale that the sound-emitting panel 2 is a rigid lightweight panel having a core 22, for example, of a rigid plastic foam 27, for example, cross-linked polyvinyl chloride or a cellular matrix 98, that is, a honeycomb made of metal foil, plastic or the like with cells extending across the plane of the panel and closing with opposite shells 21, for example, of paper, cardboard or metal foil or sheet. If the plating is made of plastic, they can be reinforced with fibers, for example, carbon, glass, Kevlar (registered trademark, TM) or the like, by a method known per se to increase their modulus.

Thus, the predicted materials of the sheath layer and the amplifiers are carbon, glass, Kevlar (TM), Nomex (TM), that is, aramid and the like fibers in different layers and weaves, as well as paper, combined paper laminated materials, melamine and various high modulus synthetic plastic films such as Mylar (TM), Kaptan (TM), polycarbonate, phenol, polyester or similar plastics and fiber-reinforced plastics, etc. and metal sheet or foil. A study of the Vectra class of liquid-crystalline polymer thermoplastics shows that they can be useful for injection molding very thin skin or smaller shells, say up to a diameter of about 30 cm. This material itself forms an oriented crystal structure in the direction of injection, the preferred orientation for good the distribution of triple energy from the drive point to the perimeter of the sound-emitting panel.

Additionally, such molding for this and other thermoplastics involves machining the mold to impart placement and alignment features, such as grooves or rings for the precise placement of transducer parts, such as motor coils and magnet suspensions. In addition, for some less durable core materials, it was calculated that a local increase in shell thickness, for example, in a region or annular space, up to 150% of the diameter of the transducer, would be useful to enhance this region and to advantageously introduce vibration energy into the panel. Through this, the amplitude-frequency response in the high frequency region should be improved when using softer foam materials.

Predictable core layer materials include honeycombs or corrugations of aluminum alloy or foil sheet, or Kevlar (TM), Nomex (TM), smooth or bound paper and various synthetic plastic films, as well as expanded or foamed plastics or cellulosic materials, even aerogel metals if they have a suitable low density. Some materials suitable for the core layer efficiently exhibit convenient self-closing into the skin during production and / or, in other words, have sufficient intrinsic rigidity for use without being placed between the skin layers. Known cellular material with a high performance core brand Rohacell (Rohacell), which may be suitable as a sound-emitting panel without a shell. From a practical point of view, general lightness and rigidity are needed, suitable for this purpose, in particular, including optimizing contributions from the core and shell layers and transitions between them.

Some of the preferred options for sound emitting panels use shells made of metal and a metal alloy or, alternatively, reinforcement with carbon fibers. Both options and also designs with an Aerogel alloy or a metal honeycomb core will have significant radio frequency shielding properties, which should have been important in some electromagnetic compatibility applications. Conventional panel or cone speakers do not have inherent shielding ability.

In addition, the preferred form of the piezoelectric and electrodynamic transducers has negligible electromagnetic radiation or scattering magnetic fields. Conventional loudspeakers have a large magnetic field up to a distance of 1 m until special compensation countermeasures are taken.

Where shielding is important in the application, an electrical connection can be made to the conductive parts of the corresponding DML panel, or an electrically conductive foam or similar interface device can be used to secure the edge.

The border 3 may dampen the edges of the sound emitting panel 2 to prevent excessive movement of the edge of the panel.

Additionally or alternatively, other damping can be applied, for example, in the form of overlays attached to the edges at selected positions to damp excessive movement to evenly distribute resonance across the panel. The linings may be of a bitumen-based material, as is commonly used in conventional speaker housings, or may be of resilient or rigid polymeric sheet material. Some materials, especially paper and cardboard, and some cores can be self-damping. If desired, damping can be increased in the design of sound-emitting panels by using elastically setting, rather than rigidly setting, binders.

The effective selective damping referred to includes the specific application to the sound-emitting panel including sheet material, means, constantly associated with it. Edges and corners, in particular, can be important for the dominant and less scattered low-frequency types of elastic vibrations of the panels. The lateral fastening of the damping means can successfully lead to a panel in which its aforementioned sheet material is completely framed, although their angles can often be relatively free, say for the desired extension to work with lower frequencies. Attachment can be carried out by means of adhesive or self-adhesive materials. Other forms of useful damping, in particular in terms of finer effects and / or mid and higher frequencies, can be by means of suitable masses or masses attached to the sheet material at predetermined effective mid-localized positions of said region.

The sound emitting panel described above is bidirectional. Sound energy from the rear side is not very strongly associated in phase with sound energy from the front side. Therefore, there is a benefit from the total summation of acoustic power in the room, the sound energy of a uniform frequency distribution, the reduced effects of reflected and standing waves with the advantage of better reproduction of the natural field and surroundings in reproduced sound recordings.

While the radiation from the sound-emitting panel is largely non-directional, the proportion of phase-related information increases the offset from the axis. For an improved focus for stray stereo imaging, placing the speakers as pictures at the normal height of a standing person provides the benefit of a moderate off-axis for a normally sitting listener, optimizing the stereo effect. Similarly, a triangular left / right arrangement relative to the listener provides an additional angular component. Thus, a good stereo effect is obtained.

There is another advantage for a group of listeners compared to playing through a regular speaker. The internally dissipated nature of the sound emitting from the sound emitting panel gives a sound volume level that does not obey the law of inverse proportionality to the squared distance for the distance to an equivalent point source. Since the decrease in sound intensity with increasing distance is much smaller than that predicted by the law of inverse proportion to the square of the distance, then, therefore, for the off-center and poorly placed listeners, the intensity field for a panel-shaped loudspeaker supports a better stereo effect compared to conventional loudspeakers. This is due to the fact that the listener, placed with an offset from the center, does not experience double difficulties due to the proximity to a closer speaker; firstly, an excessive increase in volume from a closer speaker and then a corresponding decrease in volume from another speaker.

It also has the advantage of a flat, lightweight panel-shaped loudspeaker, visually appealing, with good sound quality, requiring only one transducer and that does not have a crossover for full-range sound from each diaphragm of the panel.

In FIG. 3 illustrates a multimedia audio-visual system comprising a film projector 31 for projecting an image onto a projection screen formed by the sound-emitting panel of the type speaker 32 shown in FIG. 1 and 2.

Loudspeaker - the projection screen 32 contains a sound-emitting panel 2 having aluminum or carbon fiber reinforced shell 21, covering on both sides of the cell core 22 of aluminum foil. The composite may be bonded together using any epoxy binder. For the size of the screen sound-emitting panel 1.22x1.38 M, the thickness of aluminum skins can be 300 microns. The core thickness may be 11 mm and the cell size of the honeycomb may be 9.5 mm. Such a sound-emitting panel is rigid, having a low density, high modulus and is isotropic.

Two additional smaller speakers 114 of the type shown in FIG. 1 and 2, are hung on opposite sides of the speaker panel of the center channel 32 on the hinges 34, thereby additional panel panels may fold in front of the main panel 9 of the panel 32 when not in use and can be moved to the position shown for use. Additional sound-emitting panels 114 are used to receive and emit relevant information of the left and right channels, for example, to work with a stereo effect.

The additional speakers 114 may comprise sound emitting panels 2 having shells 21 made of aluminum foil or plastic reinforced with carbon fiber or fiberglass. A decorative film, such as polyester, may be applied to one or both of the casings. The core 22 of the sound emitting panels 114 may be of aluminum foil, for example, in the form of a honeycomb structure, or may be of paper cells. When using paper, it can be impregnated with a plastic material such as a phenolic compound to increase the stiffness of the paper. The cell size may be in the range of 3-6 mm and the core thickness may be in the range of 3-10 mm. In the case of shells of aluminum foil, they can have a thickness in the range of 25-100 microns. Epoxy adhesive can be used to assemble the sound-emitting panel.

Stereo, that is, two-channel reproduction of sound, includes the creation of the illusion of sound space, in which a stereo effect is stored containing the properties of the source location, perspective and the environment of the original recording. Stereo with conventional loudspeakers is strong in terms of locating a phantom source and, in some cases, perspectives, but is weaker in terms of expressing natural space and surroundings. This is because, near a point source, the nature of ordinary piston loudspeakers makes it easy to identify their physical location with the ears, which contradicts the desire for a general localization of the stereo image.

It is often said that, as reproducing devices, loudspeakers should disappear into the illusion of sound space. Part of the problem lies in the relatively narrow front radiation pattern of conventional loudspeakers. In addition, the sound balance to the sides and back of the cabinet, the sound that strongly controls the reverberation sound field in the room, is colored and unbalanced with significant changes in the amplitude-frequency response. This diminishes the sense of natural acoustic space and surroundings.

The embodiment of the invention shown in FIG. 3, uses two acoustic panel-shaped loudspeakers for the left and right channels, which are set for complex vibrations over the entire surface in a wide frequency range, usually in the range of 100 Hz - 20 kHz.

The main panel of the speaker 32 is shown suspended from the suspension means 33, but alternatively, the panel may be supported, for example, on a floor stand.

In FIG. 5 shows how the projection device of the present invention can be located in a room 145 equipped with seating 146. The device has a projector 31 projecting an image onto a screen 32 and also includes two low-tone reproducers 35, which may be of conventional construction, on the sides of the room for improvement a bass sound extension and two rear speakers 117, i.e., so-called surround speakers, located at the back of the room. Accordingly, the rear speakers 117 are also of the type shown in FIG. 1 and 2 due to their width and characteristics of uniform sound dispersion. The rear speakers may have the same construction as the additional speakers (114).

The panel speaker of FIG. 1 and 2 have wonderful non-directional properties. For acoustic reproduction of the surroundings of a sound system, the energy must be widely distributed, ideally from non-directional sources. It is important that the sound source is not well localized, otherwise the perception of a large surrounding space, simulated by the acoustic region behind the listener is unsatisfactory.

Until now, conventional directional and / or small-source speakers, usually of electrodynamic types, have been used to reproduce the surroundings.

Due to the phenomenon of intensity of auditory perception, listeners in the audience sitting closer to the loudspeaker of the immediate surroundings find their perception strongly localized on this loudspeaker, significantly worsening the effect of the environment and their whole assessment of the multi-channel sound field. Localization can be so powerful that auditory attention is distracted from the main front sound channels, and this works together with the Haas effect, which enhances localization to nearby sources.

The surround reproduction system constructed with one or more speakers shown in FIG. 1 and 2 delivers an extensive sound field or provides an almost uniform intensity that has intentionally poor localization. A large audience can be reached, even with some listeners in the immediate vicinity (such as 0.5 m), panel-shaped loudspeakers without any significant localization of the direct reproducing channel and with the vital property of impaired auditory perception of important front channels. A significantly improved realism is achieved for the multichannel sound reproducing system as a whole as a result of the desired emission characteristics of an acoustic panel-shaped sound reproducing device.

Ambient loudspeakers, if desired, can be suspended on wires and masked by attaching a suitable image to the sound-emitting panel (2), so that it resembles pictures.

In FIG. 4 shows how the frame (1) of the projection / sound-emitting panel can be formed with a return flange (36), thereby the bordering (3) can be hidden. The frames of the additional speakers (114) and surround speakers (117) may have a similar design.

Industrial applicability

A sound-emitting panel made to a size sufficient to serve as a projection screen for a still image of a movie image and a television image is thus simultaneously a sound reproducing device, for example for a central or interactive home theater channel. Especially, the proposed acoustic panels of a sufficiently large size, say, over 0.6 m wide, provide very good sound coverage of audiences. The working demonstrations showed high intelligibility and clarity of sound throughout the audience with the main advantage that the listeners closest to the screen did not suffer from rattling of the nearest excessive sound pressure levels, which is invariably a weak point of conventional cone-shaped directional radiation loudspeakers.

There is a second and unique aspect of the proposed projection screen. With conventional center channel loudspeakers, the ear can easily locate the acoustic center of the loudspeaker. All sounds seem to be emanating from this concentrated small source, reducing the sense of realism. With an acoustic panel, its unique property of omnidirectional radiation means that the sound seems to be coming from a common acoustic area of the screen, not from one isolated point. When the image is combined with sound, a powerful synesthetic effect occurs on the sound emitting panel. Here, the desired absence of localization of a specific sound source by the perceiving combination of ear-brain allows you to freely associate an imaginary, virtual and approximate location for sound sources synchronized with the locations represented by the visual image on the acoustic surface.

With well-recorded conversational sections, not only does the virtual acoustic image appear next to the visual image, it can also convey the information needed to sense depth and perspective. The quality of involving the audience in the cinematic experience is greatly enhanced.

Claims (12)

  1. CLAIM
    1. Demonstration screen (32), which has a light-reflecting or light-emitting surface, characterized in that this screen contains an acoustic emitter of a distributed mode, on which a transducer (9) is installed, which causes bending oscillations in the said emitter, which, in causing a resonance in the emitter, ensures sound.
  2. 2. The demonstration screen according to claim 1, characterized in that the emitter is made in the form of a rigid, light panel (2) having a cellular core (22) enclosed between two outer layers (21) of the shell.
  3. 3. The demonstration screen according to claim 2, characterized in that it contains a frame (1) surrounding the panel (2).
  4. 4. The demonstration screen according to claim 3, characterized in that it contains an elastic suspension (3), securing the panel in the frame.
  5. 5. Demonstration screen according to any one of paragraphs.2-4, characterized in that the honeycomb core (22) is made of honeycomb aluminum foil (98).
  6. 6. Demonstration screen according to any one of paragraphs.2-5, characterized in that the layers (21) of the shell are made of fiber-reinforced plastic.
  7. 7. Demonstration screen according to any one of paragraphs. 1-6, characterized in that it contains loudspeakers located on opposite sides of the screen and providing information of the left and right channels.
  8. 8. The demonstration screen according to claim 7, characterized in that the loudspeakers located on opposite sides of the screen are designed to be folded in front of the screen.
  9. 9. The demonstration screen according to claim 7 or 8, characterized in that each of the loudspeakers located on opposite sides of the screen contains an acoustic emitter of a distributed mode, on which a transducer is installed, exciting bending oscillations in said radiator, causing resonance in the radiator, provide sound generation.
  10. 10. A demo screen according to any one of paragraphs. 1-9, characterized in that it is a projection screen.
  11. 11. Audiovisual device, characterized in that it contains a demonstration screen of claim 10.
  12. 12. Audiovisual device according to claim 11, characterized in that it contains at least one rear channel loudspeaker containing an acoustic emitter of a distributed mode with a transducer installed on it, which bends vibrations in said emitter, which, causing resonance in the emitter, provide sound generation.
EA199800260A 1995-09-02 1996-09-02 Display screens incorporating loudspeakers EA000619B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GBGB9517918.0A GB9517918D0 (en) 1995-09-02 1995-09-02 Acoustic device
GBGB9522281.6A GB9522281D0 (en) 1995-10-31 1995-10-31 Acoustic device
GBGB9606836.6A GB9606836D0 (en) 1996-03-30 1996-03-30 Acoustic device
PCT/GB1996/002137 WO1997009853A2 (en) 1995-09-02 1996-09-02 Display screens incorporating loudspeakers

Publications (2)

Publication Number Publication Date
EA199800260A1 EA199800260A1 (en) 1998-08-27
EA000619B1 true EA000619B1 (en) 1999-12-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EA199800260A EA000619B1 (en) 1995-09-02 1996-09-02 Display screens incorporating loudspeakers

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EP (1) EP0847670B1 (en)
JP (1) JPH11512245A (en)
CN (1) CN1195461A (en)
AT (1) AT177579T (en)
AU (1) AU702865B2 (en)
BR (1) BR9610553A (en)
CA (1) CA2234944A1 (en)
CZ (1) CZ58598A3 (en)
DE (2) DE69601729D1 (en)
DK (1) DK0847670T3 (en)
EA (1) EA000619B1 (en)
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HK (1) HK1008646A1 (en)
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WO1997009853A2 (en) 1997-03-13
ES2130845T3 (en) 1999-07-01
CN1195461A (en) 1998-10-07
AU702865B2 (en) 1999-03-11
BR9610553A (en) 1999-12-21
DE69601729T2 (en) 1999-09-16
DK0847670T3 (en) 1999-09-27
DK847670T3 (en)
IL123486A (en) 2000-10-31
HU9901396A2 (en) 1999-08-30
RO119050B1 (en) 2004-02-27
AU6880196A (en) 1997-03-27
NZ316543A (en) 1998-10-28
CZ58598A3 (en) 1998-08-12
JPH11512245A (en) 1999-10-19
HK1008646A1 (en) 2000-03-24
TR199800362T1 (en) 1998-05-21
EP0847670B1 (en) 1999-03-10
AT177579T (en) 1999-03-15
WO1997009853A3 (en) 1997-04-03
CA2234944A1 (en) 1997-03-13
EA199800260A1 (en) 1998-08-27
EP0847670A1 (en) 1998-06-17
HU9901396A3 (en) 2002-02-28
IL123486D0 (en) 1998-09-24
DE69601729D1 (en) 1999-04-15
SK26698A3 (en) 1998-09-09
PL325235A1 (en) 1998-07-06

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