EP1204295A1 - Flacher Lautsprecher mit schallabsorbierender Deckschicht - Google Patents

Flacher Lautsprecher mit schallabsorbierender Deckschicht Download PDF

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Publication number
EP1204295A1
EP1204295A1 EP01123980A EP01123980A EP1204295A1 EP 1204295 A1 EP1204295 A1 EP 1204295A1 EP 01123980 A EP01123980 A EP 01123980A EP 01123980 A EP01123980 A EP 01123980A EP 1204295 A1 EP1204295 A1 EP 1204295A1
Authority
EP
European Patent Office
Prior art keywords
flat panel
radiator
sound
sound absorbing
panel radiator
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.)
Withdrawn
Application number
EP01123980A
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English (en)
French (fr)
Inventor
P. Roy Kenneth
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.)
Armstrong World Industries Inc
Original Assignee
Armstrong World Industries Inc
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
Application filed by Armstrong World Industries Inc filed Critical Armstrong World Industries Inc
Publication of EP1204295A1 publication Critical patent/EP1204295A1/de
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/22—Connection of slabs, panels, sheets or the like to the supporting construction
    • E04B9/24—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto
    • E04B9/241—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto with the slabs, panels, sheets or the like positioned on the upperside of the horizontal flanges of the supporting construction
    • E04B9/244—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto with the slabs, panels, sheets or the like positioned on the upperside of the horizontal flanges of the supporting construction comprising sealing means between the supporting construction and the slabs, panels, sheets or the like
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/001—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by provisions for heat or sound insulation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/006—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation with means for hanging lighting fixtures or other appliances to the framework of the ceiling
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/22—Connection of slabs, panels, sheets or the like to the supporting construction
    • E04B9/24—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto
    • E04B9/241—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like positioned on the upperside of, or held against the underside of the horizontal flanges of the supporting construction or accessory means connected thereto with the slabs, panels, sheets or the like positioned on the upperside of the horizontal flanges of the supporting construction
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B2009/0492—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like with fabrics tensioned on frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021—Transducers or their casings adapted for mounting in or to a wall or ceiling

Definitions

  • This invention relates to sound masking and sound absorbing systems in a workplace environment. More specifically, it relates to sound masking and sound absorbing systems adapted for use with a suspended ceiling.
  • Noise in a workplace is not a new problem, but it is one that is receiving increasing attention as open workplace configurations and business models continue to evolve. A number of recent studies indicate that noise, in the form of conversational distraction, is the single largest negative factor impacting worker productivity.
  • speech intelligibility and acoustic performance are determined by a variety of factors, including room shape, furnishings, number of occupants, and especially ceiling, wall, and floor treatments. This acoustic environment will determine how much sound intrusion will occur, as well as the level to which the listeners within these spaces will be affected by extraneous noise and conversational distraction.
  • a more general examination of the interior environment of a room reveals other aspects that play a major role in how sound is perceived by the occupants.
  • Recent research has indicated that when looking at the issue of sound intrusion between spaces, the transmission loss of materials and sound absorption characteristics of materials are not the only contributors to the perceived acoustical environment.
  • Another factor is the background noise in a space. This includes the sounds produced by overhead utilities such as heating, ventilation, and air conditioning (HVAC) systems.
  • HVAC heating, ventilation, and air conditioning
  • Another significant factor is the sound, much of which is conversational, that intrudes from adjacent spaces. This has become the focus of much current research. Sound can enter a space in a variety of ways.
  • a typical sound masking system includes the following elements:
  • a pink noise signal contains equal amounts of sound energy in each one-third octave band, and covers a broad frequency range which includes the speech spectrum.
  • Sound masking is usually accomplished by the introduction of a precisely contoured broadband sound that is constant in level over time, and sufficiently loud to mask conversational distraction and unwanted noise, but not so loud as to be annoying by itself. This sound is similar to that which is attributed to the HVAC system air diffuser.
  • the system generally consists of electronic devices which generate a sound signal, shape or equalize a signal and amplify a signal. This signal is then distributed to an array of speakers that are normally positioned above the ceiling in the plenum on 12 to 15 foot centers.
  • Sound masking systems in open plan offices are typically set at a sound level which corresponds to 48 dBA (dB "A" weighted) +/- 2dB. This sound level generally insures conversational privacy without causing a distraction itself.
  • Typical electrodynamic cone loudspeakers have an acoustic radiation pattern that is very dependent upon the frequency of excitation. At low frequencies, these loudspeaker radiate sound fairly uniformly over a broad range of angles. As the frequency of the input wave increases, the sound radiation pattern produced by the loudspeaker becomes more focused and directed on-axis (like a flashlight as opposed to a floodlight).
  • a common 6.5-inch speaker may have a forward radiation pattern approaching an omni-directional 180 degrees at 250 Hz, but when driven at 4 kHz, the majority of the forward sound energy produced is concentrated in a highly directional beam that is about 15 degrees wide.
  • One solution that has often been employed utilizes traditional dynamic loudspeakers mounted above a ceiling.
  • An array of conventional dynamic loudspeakers is mounted above a suspended ceiling and driven by conventional electrical wiring.
  • the loudspeakers are oriented to fire upwards into the hard floor slab above. This provides a longer reflective path for the sound to travel thus more evenly dispersing the sound in the plenum space.
  • the reflected sound passes through the suspended ceiling system, where it may be further dispersed.
  • the penalty for firing the speakers upwards is that considerable additional power is required to drive the speakers to realize the desired sound levels to the listener.
  • any disruptions in the ceiling plane such as those caused by air supply and return fixtures, lighting fixtures, and loudspeakers, have a negative effect on speech privacy due to incremental sound reflections. It would be advantageous to have a system that can introduce sound into a room without adding a sound reflective component into the ceiling plane.
  • the flat panel radiator comprises a stiff radiating panel and a transducer that is composed of a magnet attached to the radiating panel, a voice coil assembly also attached to the panel, an optimized sound absorbing facing attached to the face side of the radiator frame, and wiring to an excitation source.
  • Flat panel sound radiators work on the principle that an exciter hooked up to the flat panels causes the panels to vibrate, generating sound.
  • the sound field generated by the flat panel radiator is not restricted to the cone of sound that normal speakers generate.
  • the vibration of the panel generates a complex random ripple of waveforms on the panel surface, which in an ideal model radiates sound in a broad circular pattern much as a floodlight would radiate light over a broad area.
  • the circular distribution pattern of the flat panel radiator means that the sound levels are equal across a large listening area.
  • Flat panel radiators have broad acoustic radiation patterns at the frequencies required for sound masking.
  • the flat panel radiator includes a light, stiff radiating panel of arbitrary size, and a transducer.
  • the transducer has a magnet clamped to the radiating panel, a voice coil assembly, also attached to the panel, and wiring connected to an excitation source.
  • voice coil assembly also attached to the panel
  • wiring connected to an excitation source.
  • electrical current is passed through the voice coil, the resulting combination of electromagnetic field forces with the magnetic field will induce a very small relative displacement, or bending, of the panel material at the mounting points.
  • the motion of the flat panel is decidedly incoherent, containing many different complex modes spread over the entire surface of the radiator.
  • This effect contributes significantly to the broad radiation pattern and lack of beaming behavior characteristic of this technology. This can best be achieved through a flat panel made of honeycomb cell-type material, which is lightweight and does not rust.
  • This honeycomb material provides minimal loss and a smooth sound pressure response at low, middle, and high frequency ranges.
  • This invention provides a mounting configuration with an optimized sound absorbing feature as the visual surface for a flat panel radiator.
  • a flat panel radiator is placed inside a frame element within a suspended ceiling system, and a specified acoustic facing is attached to the frame element enclosing a layer of air between the facing and the flat panel radiator.
  • the radiating panel is either directly finished with a lamination or coating, or if an acoustically porous facing is attached with an offset from the radiator surface, then the radiator panel will act as a sound reflector to sounds within the room.
  • the specified facing has specific acoustic characteristics and is strategically placed below the flat panel radiator surface in such a way as to provide effective sound absorption.
  • the facing and the air layer function as a sound absorber, and they can optimize the acoustic rating of the flat panel radiator.
  • the facing also has aesthetic functions.
  • Fig. 1 illustrates a prior art speaker arrangement to produce masking noise signals.
  • the speaker arrangement of the current art utilizes traditional dynamic loudspeakers mounted above a ceiling, on 12 to 15-foot centers, as shown in the diagram of Fig. 1.
  • An array of conventional dynamic loudspeakers 100 is mounted above a suspended ceiling 101, powered through conventional wiring 105.
  • the loudspeakers are oriented to fire upwards into the slab 102 above. This arrangement provides a longer path for the sound to travel, and further disperses the sound field 103, depending upon the surface treatment of the hard slab.
  • the sound passes through the suspended ceiling system 101, where it may be further dispersed, so that the sound field 103 at the listener 104 is relatively diffused and consistent, as indicated by the arrows.
  • Pointing the loudspeakers directly down through the ceiling, or mounting conventional speakers atop the ceiling panels, would create a non-uniform sound field at the frequencies of interest, with some areas sounding louder and some sounding softer. Compensating for this would require the use of many more speakers at considerably higher cost.
  • the penalty for firing the speakers upwards, however, is that considerable additional power is required to drive the speakers to realize the desired sound levels to the listener 104.
  • the flat panel radiator shown in Fig. 2, includes a light, stiff radiating panel 200 of arbitrary size, and a transducer.
  • the transducer contains a magnet 201 that is clamped to the radiating panel 200, a voice coil assembly 202, also attached to the radiating panel 200, and electrical wiring 203 connected to an excitation source 204 that is not part of the radiator system.
  • Fig. 2 shows the "bender” or “clamped” driver.
  • the voice coil electromagnetic field interacts with the magnetic field produced by the magnet 201 thus producing a very small relative displacement, or bending, of the panel material 200 between the voice coil 202 and magnet 201 mounting points.
  • the motion of the flat panel 200 is decidedly incoherent, containing many different complex modes spread over the entire surface of the radiator 200. This effect contributes significantly to the broad radiation pattern and lack of beaming behavior characteristic of this technology.
  • a flat panel radiator is mounted in a frame to allow its installation in a standard inverted "T" ceiling grid.
  • Fig. 3 shows a section of a ceiling grid, including inverted tee main beams 600, supporting hanger wires 601, and cross tee beams 602.
  • the radiator panel frame element 603 with an attached bridge support element 604 and an enclosure 606 is placed into the grid elements as shown by the dotted lines 605.
  • the enclosure 606 contains a terminal block (not shown) for connecting the transducer to an external-driving source.
  • Fig. 4 illustrates an embodiment of a C-shaped frame in which a flat panel radiator is mounted in a variable-sized containment element positioned within the C-shaped frame.
  • the flat panel radiator 200 is supported, and the boundary conditions fixed, by C-shaped variable-sized containment element 212, and placed inside a C-shaped frame 210.
  • a bridge support element 604 is positioned above and across the frame 210.
  • the bridge support element supports box 610 containing electronic components, which are used to drive vibrations on the flat panel radiator 200.
  • the frame 210 has an isolation element 214 below the bottom face of the frame that overlaps with the flanges of the ceiling grid system 600.
  • the isolation element 214 can be made from a resilient material such as foam.
  • the isolation element 214 isolates the flat panel radiator from the grid support elements 600 both mechanically and acoustically and prevents vibrations from the flat panel radiator being transmitted onto the suspended ceiling system.
  • a facing 236 is added as an acoustically resistant covering for the flat panel radiator, and can be fabricated to aesthetically match the rest of the ceiling.
  • the acoustic resistance of the facing is approximately 800 MKS rayls for sound absorption optimization.
  • the acoustic resistance of the facing in general, should be between 400 and 4000 MKS rayls.
  • the containment element 212 can be varied in thickness to create a different design depth from the lower surface of the flat panel radiator to the acoustically resistant facing.
  • An optimum spacing for sound absorption purposes in this and the following embodiments is a distance of between one and three inches from the lower surface of the flat panel radiator to the acoustically resistant facing. In other embodiments, the distance between the acoustically resistant facing and the lower surface of the flat panel radiator can be up to four inches.
  • the depth of the bottom portion of the containment element 212 is expressed as an offset from the bottom of the flat panel radiator to the bottom surface of the bottom plate of the C-shaped frame 210.
  • the facing or scrim in this and in the following embodiments can have an acoustic flow resistance of approximately 800 MKS rayls for optimization.
  • Figs. 5A-5B illustrate alternate embodiments of the C-shaped frame in which the variable-sized containment element does not itself need to be C-shaped.
  • the containment elements 218, 228 are positioned at the top and bottom of the flat panel radiator 200, respectively.
  • Containment element 228 can be of a variable depth in order to position the flat panel radiator at an optimum distance for sound absorption from the acoustically resistant facing 236.
  • the acoustically resistant facing 236 is attached to the upper surface of isolation element 214.
  • the acoustically resistant facing 236 is attached to the lower surface of the isolation element 214. In cases where the containment elements 218 and 228 are chosen to be sufficient to isolate the flat panel radiator, then isolation element 214 may not be necessary.
  • Fig. 6 illustrates a cross-sectional view of one embodiment of a flat panel radiator assembly including a C-shaped frame 704 and equal-sized containment elements 708 that center and fix the boundary conditions of the flat panel radiator 200 in the frame 704.
  • the flat panel radiator assembly is mounted in a suspended ceiling system that comprises ceiling grid support elements 600 that surround the location of the radiator installation and connect the assembly to a plurality of similar elements.
  • grid support element 600 is depicted as having flanges, any type of tab structure can be used instead of flanges for providing the same support function for the frame element 704.
  • the flat panel radiator 200 fits into a rectangular frame element 704 that has a C-shaped cross-section formed by a top plate, a side plate, and a bottom plate.
  • Each plate has a standard size and thickness in order to be placed between the ceiling grid support elements 600.
  • a bridge-supporting element 604 which is attached along the top surface of opposite sides of the rectangular frame element 704, provides a mounting structure for a terminal box.
  • a rectangular radiating panel/element 200 of a size slightly less than the inside dimensions of the rectangular frame element 704 is centered within the rectangular flame element 704 and attached to the acoustic transducer 706.
  • Equal-sized containment elements 708 that may be attached by adhesive to the inside surfaces of the rectangular frame element 704 support the perimeter edge of the radiating panel 200.
  • An isolation element 214 is affixed to the bottom plate of frame 704 to isolate the radiator from the rectangular frame element 704.
  • the transducer's wiring 203 is routed through the terminal box to an external power source (not shown).
  • Fig. 7 illustrates an embodiment of an L-shaped frame as opposed to a C-shaped frame.
  • the edge of the flat panel radiator 200 cannot be clamped, and the variable-sized isolation element 214 both holds the flat panel radiator 200 in place with an adhesive material, and isolates the flat panel radiator mechanically and acoustically from the ceiling grid structure 600.
  • the isolation element 214 is of variable depth and is used to position the flat panel radiator 200 at a certain height above an acoustically resistant facing 236 which is attached to the lower surface of the L-shaped frame element 220.
  • Fig. 8 illustrates an embodiment of the present invention in which a flat panel radiator is mounted through an isolation element in a suspended ceiling.
  • the flat panel radiator 200 is supported by two equal-sized resilient containment elements 708, one on each side of the flat panel radiator, and placed inside a frame element 704 of a C-shaped cross-section.
  • a bridge support element 604 is placed above and across the frame element 704.
  • the frame element 704, which is slightly larger than the openings of the suspended ceiling system, has a resilient isolation element 806 attached to its bottom face that overlaps with the flanges of the ceiling system. Any type of tab structure can be used instead of flanges for providing the same support function for the frame element.
  • the resilient containment element and isolation elements cover the entire perimeter of the radiator's flat panel.
  • the resilient isolation element 806 and containment elements 708 is a foam material.
  • the isolation element 806 isolates the flat panel radiator from both the grid support elements 700 mechanically and acoustically and prevents vibrations from the radiator panel onto the suspended ceiling system.
  • a facing or scrim 810 is added as an acoustically resistant cover for the flat panel radiator.
  • Figs. 3 through 8 illustrate simple lay-in mounting configurations.
  • a flat panel radiator 200 can be installed into a standard suspended ceiling system 101 (Fig. 1) by laying it between the inverted "T" grid elements 600, as shown, for example, in Fig. 6.
  • the radiating surface 200 of the flat panel radiator is roughly even with, or even slightly above, the plane of the ceiling grid.
  • An acoustically resistant facing or scrim 710 added to cover the flat panel radiator provides a sound absorption function.
  • Fig. 9 illustrates an embodiment of a tegular "C"-shaped frame with a variable-sized containment element and acoustically resistant facing for a flat panel radiator.
  • the variable-sized C-shaped containment element 212 is placed inside the tegular C-shaped frame element 230.
  • the tegular C-shaped frame element 230 includes a lower plate, a first side plate, an upper plate, a second side plate, and a top plate.
  • the lower plate and first side plate extend below the bottom of the ceiling grid 600.
  • the acoustically resistant facing 236 is attached to the lower surface of the lower plate of frame 230.
  • Isolation element 214 isolates the frame from the ceiling grid both mechanically and acoustically.
  • Fig. 10 illustrates an embodiment of a tegular L-shaped frame with a variable-sized isolation element.
  • the edge of the flat panel radiator 200 cannot be clamped, and the variable-sized isolation element 214 functions both to hold the flat panel radiator in place with an adhesive and to provide isolation. More importantly, it serves to position the flat panel radiator 200 at an optimum height above an acoustically resistant facing for sound absorption purposes.
  • the tegular L-shaped frame 240 is positioned on the ceiling grid structure and has a side and a bottom plate that extend below the ceiling grid flanges.
  • the acoustically resistant facing 236 is attached to the bottom plate of the tegular L-shaped frame 240.
  • the sound radiator and assembly system can also be used in a grid structure of a wall or wall partition having discrete panels similar to those used for the ceiling grid.
  • the flat panel radiator would be supported in the same way but with the radiator positioned vertically, rather than horizontally between the upper and lower plates of the frame element.
  • the acoustic scrim can be affixed to edges of the frame element facing into the listening area to again cover the opening created by the main beams and cross beams of a wall partition. The scrim would be acoustically resistant as described above.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP01123980A 2000-11-03 2001-10-08 Flacher Lautsprecher mit schallabsorbierender Deckschicht Withdrawn EP1204295A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70531300A 2000-11-03 2000-11-03
US705313 2000-11-03

Publications (1)

Publication Number Publication Date
EP1204295A1 true EP1204295A1 (de) 2002-05-08

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EP01123980A Withdrawn EP1204295A1 (de) 2000-11-03 2001-10-08 Flacher Lautsprecher mit schallabsorbierender Deckschicht

Country Status (10)

Country Link
EP (1) EP1204295A1 (de)
JP (1) JP2002194836A (de)
KR (1) KR20020034895A (de)
AR (1) AR031285A1 (de)
AU (1) AU8553701A (de)
BR (1) BR0104820A (de)
CA (1) CA2359167A1 (de)
MX (1) MXPA01010807A (de)
NZ (1) NZ514651A (de)
TW (1) TW513501B (de)

Cited By (7)

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Publication number Priority date Publication date Assignee Title
FR2875520A1 (fr) * 2004-09-20 2006-03-24 Structures Fixations Panneaux Panneau modulaire pour revetement de surface
CN103397712A (zh) * 2013-08-10 2013-11-20 厦门嘉达声学技术有限公司 消声室传动轴隔声结构
EP2941016A4 (de) * 2012-12-25 2016-09-21 Kyocera Corp Schallgenerator, schallerzeugungsvorrichtung und elektronische vorrichtung
CN109313886A (zh) * 2016-03-01 2019-02-05 佳殿玻璃有限公司 具有双墙结构和被动噪音破坏性能的音响墙部件及其制造方法
GB2574457A (en) * 2018-06-07 2019-12-11 Amina Tech Limited Front Mounted Flat Panel Loudspeaker Assembly
CN114097251A (zh) * 2019-05-23 2022-02-25 Pss比利时股份有限公司 用于产生低音频率声音的偶极扬声器
US11323792B2 (en) 2018-06-07 2022-05-03 Amina Technologies Limited Front mounted flat panel loudspeaker assembly

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GB1496663A (en) * 1974-11-30 1977-12-30 Champion Int Corp Sound-absorbing panels
US4330691A (en) * 1980-01-31 1982-05-18 The Futures Group, Inc. Integral ceiling tile-loudspeaker system
US4385210A (en) * 1980-09-19 1983-05-24 Electro-Magnetic Corporation Electro-acoustic planar transducer
US4923032A (en) * 1989-07-21 1990-05-08 Nuernberger Mark A Ceiling panel sound system
US4928312A (en) * 1988-10-17 1990-05-22 Amel Hill Acoustic transducer
WO1997009843A1 (en) * 1995-09-02 1997-03-13 New Transducers Limited Loudspeakers comprising panel-form acoustic radiating elements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1496663A (en) * 1974-11-30 1977-12-30 Champion Int Corp Sound-absorbing panels
US4330691A (en) * 1980-01-31 1982-05-18 The Futures Group, Inc. Integral ceiling tile-loudspeaker system
US4385210A (en) * 1980-09-19 1983-05-24 Electro-Magnetic Corporation Electro-acoustic planar transducer
US4928312A (en) * 1988-10-17 1990-05-22 Amel Hill Acoustic transducer
US4923032A (en) * 1989-07-21 1990-05-08 Nuernberger Mark A Ceiling panel sound system
WO1997009843A1 (en) * 1995-09-02 1997-03-13 New Transducers Limited Loudspeakers comprising panel-form acoustic radiating elements

Cited By (11)

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AU8553701A (en) 2002-05-09
BR0104820A (pt) 2002-07-02
MXPA01010807A (es) 2002-05-14
AR031285A1 (es) 2003-09-17
JP2002194836A (ja) 2002-07-10
NZ514651A (en) 2003-05-30
TW513501B (en) 2002-12-11
CA2359167A1 (en) 2002-05-03

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