WO1997009846A1 - Haut-parleurs en forme de panneau - Google Patents

Haut-parleurs en forme de panneau Download PDF

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Publication number
WO1997009846A1
WO1997009846A1 PCT/GB1996/002162 GB9602162W WO9709846A1 WO 1997009846 A1 WO1997009846 A1 WO 1997009846A1 GB 9602162 W GB9602162 W GB 9602162W WO 9709846 A1 WO9709846 A1 WO 9709846A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
radiator
transducer
form loudspeaker
loudspeaker according
Prior art date
Application number
PCT/GB1996/002162
Other languages
English (en)
Inventor
Henry Azima
Martin Colloms
Neil Harris
Original Assignee
New Transducers Limited
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
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34865248&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997009846(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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
Priority to EP96929403A priority Critical patent/EP0847665B1/fr
Priority to US09/029,360 priority patent/US6031926A/en
Priority to AT96929403T priority patent/ATE179296T1/de
Priority to EA199800172A priority patent/EA001720B1/ru
Priority to DE69602203T priority patent/DE69602203T2/de
Priority to CA002230461A priority patent/CA2230461A1/fr
Application filed by New Transducers Limited filed Critical New Transducers Limited
Priority to CN96196710.2A priority patent/CN1195458A/zh
Priority to JP9510963A priority patent/JPH11512257A/ja
Priority to AU68818/96A priority patent/AU703122B2/en
Priority to PCT/GB1996/002162 priority patent/WO1997009846A1/fr
Priority to RO98-00641A priority patent/RO119045B1/ro
Priority to DK96929403T priority patent/DK0847665T3/da
Priority to ES96929403T priority patent/ES2132953T3/es
Publication of WO1997009846A1 publication Critical patent/WO1997009846A1/fr
Priority to HK98109454A priority patent/HK1008649A1/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges

Definitions

  • the invention relates to loudspeakers and more particularly to loudspeakers comprising panel-form acoustic radiating elements.
  • a panel-form loudspeaker comprising:- a resonant multi-mode radiator element being a unitary sandwich panel formed of two skins of material with a spacing core of transverse cellular construction, wherein the panel is such as to have ratio of bending stiffness (B) , in all orientations, to the cube power of panel mass per unit surface area ( ⁇ ) of at least 10; a mounting means which supports the panel or attaches to it a supporting body, in a free undamped manner; and an electro-mechanical drive means coupled to the panel which serves to excite a multi-modal resonance in the radiator panel in response to an electrical input within a working frequency band for the loudspeaker.
  • B bending stiffness
  • ⁇ cube power of panel mass per unit surface area
  • 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 application no. (our case P.5711) 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 active acoustic devices in the form of loudspeakers.
  • the invention provides a panel-form loudspeaker having a distributed mode acoustic radiator and a first transducer coupled to the radiator to excite distributed mode resonance in the radiator, characterised by a second transducer coupled to vibrate the radiator.
  • the first and second transducers may be adapted to operate in different frequency ranges.
  • One of the transducers may be electromagnetic.
  • One of the transducers may be piezo- electric.
  • the panel-form loudspeaker may be a second distributed mode acoustic radiator mounted on or in the first said radiator, and a resilient suspension coupling the first and second radiators, the first transducer being mounted wholly and exclusively on the first radiator and the second transducer being wholly and exclusively mounted on the second radiator.
  • the second radiator may be mounted in an aperture in the first radiator.
  • Figure 1 is a diagram showing a distributed-mode loudspeaker as described and claimed in our co-pending International application No... (our case P.5711);
  • Figure 2a is a partial section on the line A-A of Figure 1;
  • Figure 2b is an enlarged cross-section through a distributed mode radiator of the kind shown in Figure 2a. and showing two alternative constructions;
  • Figure 3 is a diagram of a first embodiment of distributed-mode loudspeaker according to the present invention
  • Figure 4 is a diagram of a second embodiment of distributed mode loudspeaker according to the invention
  • Figure 5 is a diagram of a third embodiment of distributed mode loudspeaker according to the invention.
  • Figure 6 is a diagram of a fourth embodiment of distributed mode loudspeaker according to the invention.
  • Figure 7 is a perspective diagram of a transducer.
  • a panel-form loudspeaker (81) of the kind described and claimed in our co-pending International application No. (our case P.5711) 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 applications Nos. (our cases P.5683/4/5) 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 application No. (our case P.5711) 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 2a and 2b are partial typical cross-sections through the loudspeaker (81) of Figure 1.
  • Figure 2a 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 2b 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 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.
  • skins e.g. of paper, card, plastics or metal foil or sheet.
  • the skins 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.
  • 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 bi ⁇ directional.
  • 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.
  • FIG 3 illustrates a panel-form loudspeaker (81) generally similar to that shown in Figures 1 and 2 and in which the distributed mode panel (2) is formed with a generally rectangular aperture (82) within its boundaries in which is mounted a second distributed mode sound radiating panel (4) with a resilient suspension (3) interposed between the respective panels.
  • the panel (4) is constructed in the same manner as the panel (2), e.g. with a central core (22) separating skins (21) .
  • the panel (4) is driven by its own transducer (9) mounted wholly and exclusively on or in the panel (4) at a predetermined location to produce a high frequency acoustic output, while the panel (2) is driven by a separate transducer (9) to produce an acoustic output of lower frequency, so that the loudspeaker can readily encompass the whole acoustic spectrum.
  • a separate transducer 9
  • Such an arrangement may be useful if losses in the material of the panel tend to attenuate high frequencies.
  • More than one transducer may be mounted on each or one of the panel to improve performance.
  • Figure 4 illustrates how a distributed mode panel (2) according to the present invention, and for example of the kind shown in Figures 1 and 2, can be driven to resonate by a pair (70,71) of transducers (9).
  • the smaller one of the transducers (70) is a high frequency piezo transducer, e.g. of the kind shown in Figure 7, and the larger one of the transducers (71) is of the electrodynamic kind, e.g. as shown in our co-pending International application Nos... (our files P5683/4/5) .
  • the transducers (70,71) are driven by an amplifier (10) coupled in parallel to the respective transducers with the interposition of a step-up transformer (72) and matching resistance (73) in the line to the piezo transducer in view of its relatively high voltage requirement. If desired more than one transducer (70) and/or transducer (71) may be provided to improve the performance.
  • Figure 5 illustrates how a distributed mode panel (2) according to the present invention, e.g. of the kind shown in Figures 1 and 2, can be driven by a pair (70,74) of transducers (9), the transducer (70) being a high frequency piezo-electric transducer e.g. of the kind shown in Figure 7 and the transducer (74) being a low frequency piezo- electric transducer of the kind shown in our co-pending International application No. (our file P.5684).
  • Reference (75) indicates that the transducer (74) is weighted with a mass to increase its inertia.
  • the transducers (70,74) are driven by an amplifier (10) to which they are connected in parallel, with resistors (78) interposed to provide a frequency dividing network. If desired more than one transducer (70) and/or transducer (74) may be provided to improve the performance.
  • Figure 6 illustrates how a distributed mode panel (2) according to the present invention, e.g. of the kind shown in Figures 1 and 2, can be driven by a pair (68,69) of electrodynamic transducers, e.g. of the kinds shown in our co-pending International application Nos. (our files P.5683/4/5) .
  • the transducer (68) is intended as a high frequency driver and is thus of low inductance, whereas the transducer (69) is intended as a low frequency driver and is of high inductance.
  • the transducers (68,69) are driven in parallel by an amplifier (10) with a capacitor (77) in the line to the transducer (68) to act as a frequency divider to pass most of the high frequency signal to the transducer (68) . If desired more than one transducer (68) and/or transducer (69) may be provided to improve the performance.
  • FIG. 7 shows a transducer (9) for a distributed mode panel (2) in the form of a crystalline disc-like piezo bender (27) mounted on a disc (118), e.g. of brass, which is bonded to a face of the panel (2), e.g. by an adhesive bond (20) .
  • a transducer (9) for a distributed mode panel (2) in the form of a crystalline disc-like piezo bender (27) mounted on a disc (118), e.g. of brass, which is bonded to a face of the panel (2), e.g. by an adhesive bond (20) .
  • an acoustic signal applied to the transducer (9) via leads (28) will cause the piezo disc (27) to bend and thus locally resiliently deform the panel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Holo Graphy (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

La présente invention concerne un haut-parleur (81) constitué d'un élément radiant acoustique (2, 4) fonctionnant en mode distribué, et d'un premier transducteur (9) couplé à l'élément radiant (2) de façon à exciter dans l'élément radiant la résonance en mode distribué, ledit haut-parleur étant caractérisé par un second transducteur (9) couplé de façon à faire vibrer l'élément radiant (14).
PCT/GB1996/002162 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau WO1997009846A1 (fr)

Priority Applications (14)

Application Number Priority Date Filing Date Title
PCT/GB1996/002162 WO1997009846A1 (fr) 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau
RO98-00641A RO119045B1 (ro) 1995-09-02 1996-09-02 Difuzor în formă de panou
ES96929403T ES2132953T3 (es) 1995-09-02 1996-09-02 Altavoces con forma de panel.
DK96929403T DK0847665T3 (da) 1995-09-02 1996-09-02 Panelformede højttalere
CN96196710.2A CN1195458A (zh) 1995-09-02 1996-09-02 板式扬声器
AT96929403T ATE179296T1 (de) 1995-09-02 1996-09-02 Paneelförmige lautsprecher
EA199800172A EA001720B1 (ru) 1995-09-02 1996-09-02 Панелеобразный громкоговоритель
DE69602203T DE69602203T2 (de) 1995-09-02 1996-09-02 Paneelförmige lautsprecher
CA002230461A CA2230461A1 (fr) 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau
EP96929403A EP0847665B1 (fr) 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau
US09/029,360 US6031926A (en) 1996-09-02 1996-09-02 Panel-form loudspeakers
JP9510963A JPH11512257A (ja) 1995-09-02 1996-09-02 パネル式ラウドスピーカ
AU68818/96A AU703122B2 (en) 1995-09-02 1996-09-02 Panel-form loudspeakers
HK98109454A HK1008649A1 (en) 1995-09-02 1998-07-28 Panel-form loudspeakers

Applications Claiming Priority (7)

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
GB9517918.0 1996-03-30
GB9522281.6 1996-03-30
GBGB9606836.6A GB9606836D0 (en) 1996-03-30 1996-03-30 Acoustic device
GB9606836.6 1996-03-30
PCT/GB1996/002162 WO1997009846A1 (fr) 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/707,012 Continuation-In-Part US6332029B1 (en) 1995-09-02 1996-09-03 Acoustic device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/477,358 Continuation US6188775B1 (en) 1995-09-02 2000-01-04 Panel-form loudspeakers

Publications (1)

Publication Number Publication Date
WO1997009846A1 true WO1997009846A1 (fr) 1997-03-13

Family

ID=34865248

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002162 WO1997009846A1 (fr) 1995-09-02 1996-09-02 Haut-parleurs en forme de panneau

Country Status (13)

Country Link
EP (1) EP0847665B1 (fr)
JP (1) JPH11512257A (fr)
CN (1) CN1195458A (fr)
AT (1) ATE179296T1 (fr)
AU (1) AU703122B2 (fr)
CA (1) CA2230461A1 (fr)
DE (1) DE69602203T2 (fr)
DK (1) DK0847665T3 (fr)
EA (1) EA001720B1 (fr)
ES (1) ES2132953T3 (fr)
HK (1) HK1008649A1 (fr)
RO (1) RO119045B1 (fr)
WO (1) WO1997009846A1 (fr)

Cited By (40)

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WO1998028942A1 (fr) * 1996-12-20 1998-07-02 Nct Group, Inc. Transducteurs electroacoustiques comprenant des panneaux vibrants
WO1998052381A2 (fr) * 1997-05-15 1998-11-19 New Transducers Limited Haut-parleur a panneaux
GB2351200A (en) * 1999-06-15 2000-12-20 Nec Corp Off-centre or multipoint driven panel loudspeaker
US6278790B1 (en) 1997-11-11 2001-08-21 Nct Group, Inc. Electroacoustic transducers comprising vibrating panels
WO2002045460A2 (fr) * 2000-11-30 2002-06-06 New Transducers Limited Hauts-parleurs
US6411723B1 (en) 1998-06-22 2002-06-25 Slab Technology Limited Loudspeakers
US6839444B2 (en) 2000-11-30 2005-01-04 New Transducers Limited Loudspeakers
US6865277B2 (en) 2000-01-27 2005-03-08 New Transducers Limited Passenger vehicle
US7149318B2 (en) 2000-01-24 2006-12-12 New Transducers Limited Resonant element transducer
US7151837B2 (en) 2000-01-27 2006-12-19 New Transducers Limited Loudspeaker
EP1740014A1 (fr) * 2005-06-28 2007-01-03 Robert Bosch Gmbh Dispositif pourvu d'un transducteur de flexion adaptatif pour l'émission d'un bip sonore
GB2504691A (en) * 2012-08-06 2014-02-12 Jaguar Land Rover Ltd Exciter coupling arrangement improves frequency response for a bending wave loudspeaker
USD733678S1 (en) 2013-12-27 2015-07-07 Emo Labs, Inc. Audio speaker
US9094743B2 (en) 2013-03-15 2015-07-28 Emo Labs, Inc. Acoustic transducers
USD741835S1 (en) 2013-12-27 2015-10-27 Emo Labs, Inc. Speaker
USD743376S1 (en) * 2013-06-25 2015-11-17 Lg Electronics Inc. Speaker
US9232316B2 (en) 2009-03-06 2016-01-05 Emo Labs, Inc. Optically clear diaphragm for an acoustic transducer and method for making same
USD748072S1 (en) 2014-03-14 2016-01-26 Emo Labs, Inc. Sound bar audio speaker
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9615189B2 (en) 2014-08-08 2017-04-04 Bongiovi Acoustics Llc Artificial ear apparatus and associated methods for generating a head related audio transfer function
US9615813B2 (en) 2014-04-16 2017-04-11 Bongiovi Acoustics Llc. Device for wide-band auscultation
US9621994B1 (en) 2015-11-16 2017-04-11 Bongiovi Acoustics Llc Surface acoustic transducer
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
US9741355B2 (en) 2013-06-12 2017-08-22 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
US9793872B2 (en) 2006-02-07 2017-10-17 Bongiovi Acoustics Llc System and method for digital signal processing
US9883318B2 (en) 2013-06-12 2018-01-30 Bongiovi Acoustics Llc System and method for stereo field enhancement in two-channel audio systems
US9906867B2 (en) 2015-11-16 2018-02-27 Bongiovi Acoustics Llc Surface acoustic transducer
US9906858B2 (en) 2013-10-22 2018-02-27 Bongiovi Acoustics Llc System and method for digital signal processing
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10639000B2 (en) 2014-04-16 2020-05-05 Bongiovi Acoustics Llc Device for wide-band auscultation
US10701505B2 (en) 2006-02-07 2020-06-30 Bongiovi Acoustics Llc. System, method, and apparatus for generating and digitally processing a head related audio transfer function
US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
US10848867B2 (en) 2006-02-07 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
US10848118B2 (en) 2004-08-10 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
US10959035B2 (en) 2018-08-02 2021-03-23 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
US11202161B2 (en) 2006-02-07 2021-12-14 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
US11211043B2 (en) 2018-04-11 2021-12-28 Bongiovi Acoustics Llc Audio enhanced hearing protection system
GB2597988A (en) * 2020-08-13 2022-02-16 Full Stack Acoustic Ltd Loudspeaker apparatus, Loudspeaker system, display panel and systems thereof
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing

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JP2006319626A (ja) * 2005-05-12 2006-11-24 Kenwood Corp スクリーンスピーカシステム
TW200706049A (en) * 2005-05-12 2007-02-01 Kenwood Corp Screen speaker system
US20150010173A1 (en) * 2013-07-05 2015-01-08 Qualcomm Incorporated Apparatus and method for providing a frequency response for audio signals
CN106658318A (zh) * 2017-01-20 2017-05-10 瑞声科技（南京）有限公司 振动发声系统

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RO119045B1 (ro) 2004-02-27
EA199800172A1 (ru) 1998-10-29
EA001720B1 (ru) 2001-08-27
DK0847665T3 (da) 1999-10-25
DE69602203D1 (de) 1999-05-27
CA2230461A1 (fr) 1997-03-13
ES2132953T3 (es) 1999-08-16
EP0847665A1 (fr) 1998-06-17
AU6881896A (en) 1997-03-27
CN1195458A (zh) 1998-10-07
HK1008649A1 (en) 1999-05-14
ATE179296T1 (de) 1999-05-15
AU703122B2 (en) 1999-03-18
DE69602203T2 (de) 1999-09-16
JPH11512257A (ja) 1999-10-19
EP0847665B1 (fr) 1999-04-21

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