EP1068770A1 - Dispositif acoustique ayant recours a l'action d'une onde de flexion - Google Patents

Dispositif acoustique ayant recours a l'action d'une onde de flexion

Info

Publication number
EP1068770A1
EP1068770A1 EP99910539A EP99910539A EP1068770A1 EP 1068770 A1 EP1068770 A1 EP 1068770A1 EP 99910539 A EP99910539 A EP 99910539A EP 99910539 A EP99910539 A EP 99910539A EP 1068770 A1 EP1068770 A1 EP 1068770A1
Authority
EP
European Patent Office
Prior art keywords
acoustic device
acoustic
area
panel
bending
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.)
Granted
Application number
EP99910539A
Other languages
German (de)
English (en)
Other versions
EP1068770B1 (fr
Inventor
Henry Azima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP1068770A1 publication Critical patent/EP1068770A1/fr
Application granted granted Critical
Publication of EP1068770B1 publication Critical patent/EP1068770B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/22—Clamping rim of diaphragm or cone against seating

Definitions

  • the invention relates to acoustic devices of the kind comprising a sound radiating member relying on bending wave action and resulting surface vibration to produce acoustic output .
  • Preferential in-board locations for transducers of active acoustic devices usefully have proportional defining coordinates.
  • Other areal distributions of bending stiffness can usefully contribute to affording other useful locations for transducers, for example substantially at geometric centres and/or at centres of mass, see International Patent Application WO98/00621 including for combining aforesaid bending wave action with further acoustically relevant 3
  • Specific embodiments of this invention additionally provide for means affording substantial restraint of bending wave vibration typically at edge, periphery or other boundary of such member or panel or acoustically active area thereof, and further typically to be at least capable of operating at least partly below coincidence frequency.
  • the wording 'substantial restraint' as used herein intentionally involves greater constraining of at least part(s) of edge(s) of the member than specifically disclosed in 097/09842, preferably as to both of edge extent (s) and effective loading, grip or effective grounding effect.
  • Resulting nominally less populous or less rich content of acoustically active/relevant resonant bending wave modes can be exemplified for simplified analogy and analysis based on equivalent simple beams with account taken of interactions, in terms of involving resonant plate modes that relative to each beam start at resonant mode frequency fl rather than fO, and further 'losing' combinational modes involving fO frequencies, but with interesting and useful effects available with respect to even-ness of spacings of directly and combinationally related natural resonant modes involving fl frequencies.
  • Ramifications are extensive and can be advantageous, including attainability of improved acoustic efficiency of energy conversion and/or often very usefully increased extents of candidate sub-areas for viable/optimal transducer location (s), at least as identified by mechanical impedance analysis as taught in co-pending International patent application PCT/GB99/00404 ; and/or typically much greater range of viability of areal shapes/proportions of said members as exemplified for isotropic bending stiffness, even at about 1:1 through to about 1:3 and more for aspect ratio (s); and/or viability of acoustic performance for panel member materials of lower intrinsic bending stiffness at least as effectively stiffened overall by contribution from edge (s) /peripheral/boundary restraint hereof; and/or 6
  • an acoustic device relying on bending wave action and capable of operating below coincidence, comprising a member affording said acoustic operation by reason of beneficial distribution of resonant modes of bending wave action therein, wherein the member has its acoustically active area at least partly bounded by means having a substantially restraining nature in relation to bending wave vibration.
  • an active acoustic device comprising a member relying on bending wave action with beneficial distribution of resonant modes thereof and beneficial location of bending wave transducer means, wherein the 7
  • member has its acoustically active area at least partly bounded by means having a substantially restraining nature in relation to bending wave vibration, and its transducer means location determined with reference to and taking account of such bounding means .
  • the entire periphery of an acoustic member hereof may be substantially restrained, or clamped; or only part (s) less than all of periphery of the member, e.g. a rectangular panel, may be restrained or clamped at one or more up to all of its side edges.
  • This can be useful as a flag- like mounting affording said substantial restraint at one side with the acoustically active area protruding therefrom, or as mounting at two sides that may be parallel and afford said substantial restraint with the acoustically active area between those mounting and restraining sides; and can facilitate the manufacture of up to fully sealed or only highly selectively vented diaphragm loudspeakers, e.g. mid/high frequency devices.
  • a fully or near-fully sealed diaphragm enables the making of a so-called infinite baffle loudspeaker to contain/control rear acoustic radiation which might otherwise be detrimental at mid to low frequencies .
  • Full substantially restraining or clamping frames also enable design of the loudspeaker assembly to be more predictable in mechanical terms, along with facilitating making a loudspeaker assembly which is relatively robust in construction (compared to a resonant panel loudspeaker in which the panel edges are substantially free or are 8
  • Substantial restraint or clamping of peripheral portion (s) or edge(s) of the acoustic member may be achieved in any desired manner, e.g. by intimately fixing the edge(s) to a strong frame or the like by means of an adhesive, or by mechanical means say involving clamping the edge(s) between frame members.
  • the desired edge restraint/clamping hereof may also be achieved by moulding techniques (such as injection moulding of plastics materials) by forming the edges of the member with integral or integrated thickened surround portions of sufficient rigidity to terminate edge movement of the acoustic member. Co-moulding of the acoustic member and thickened edge provision may be appropriate. Such moulding techniques may be particularly suitable where the acoustic member is formed as a monolith and may be readily achievable in economic manner.
  • Substantial restraint or clamping may also be used to define one acoustic member within another larger acoustic member.
  • a large acoustic panel intended for mid/low frequency operation may be moulded to include a smaller acoustic panel intended for high frequency operation and defined by medial stiffening ribs.
  • Substantial restraint or clamping action can be designed to present a mechanical termination impedance designed to control the reverberation time within the acoustic member as an aid to control of the frequency response of the member, perhaps especially at lower 9
  • Proportions of suitable resonant panel members may be as or substantially different from specific teaching of O97/09842 regarding variations on particular shapes.
  • substantially rectangular resonant panel members of substantially isotropic bending stiffness could be of aspect ratios below 1:1.5 then generally inclusive of prior teaching for substantially free edge panel members but not limited thereto as will be specifically described later herein, or greater than 1:1.5 as will also be specifically described later herein.
  • Variations for anisotropy/complex distribution of bending stiffness (es) is envisaged as above .
  • the bounding means may be at least partially about and definitive of said acoustically active area and/or about peripheral edge(s) of a panel-form member to be wholly acoustically active, typically to extent of up to 25% or more of full area boundary/peripheral edge extent, often the whole thereof .
  • Resonant panel members are generally self-supporting and would not require pre-tensioning for mechanical stability, particularly for types typical of free edge or simple edge supported use.
  • the stiffness of panel member in such cases may be as low as 0.001 Nm and the area density as small as 25g/m 2 .
  • the tensioned panel exhibits a high proportion of the properties of a tensioned film supporting bending waves and with predominantly second order or non- dispersive wave action (velocity constant with frequency) .
  • the resonant distribution may be optimised for desired acoustic behaviour by control of tensioning and boundary geometry in broad agreement with distributed mode teaching, see O97/09842.
  • a preferred modal distribution may be further augmented into action as a transducer via preferred/optimised placement of the exciter/sensor.
  • Figures 1 and 1A are exploded perspective and scrap sectional views of a resonant generally rectangular panel acoustic member 10 clamped at its edges between opposed rectangular perimeter frame members 11A,B using bolts and nuts 12A,B which may be further useful for mounting to a chassis or other mother structure;
  • Figure 2 is a scrap sectional view showing alternative edge clamping/terminating of resonant panel acoustic member 20 by edge fixing to a frame 21 by means of an adhesive 22;
  • Figures 3 and 3A are partial perspective and scrap sectional views of a plastics injection moulding 35 formed as a wall member having stiffening ribs 36 which intersect with a rectangular border 31 as a restraining edge of an acoustically active panel area 30, the border 31 also being formed by raised ribs that stiffen the edges of the operative panel area 30;
  • Figure 4 is a partial perspective view of a resonant panel acoustic member 40 stretched over a frame 41 and clamped at its edges by a surrounding clamping frame member 42;
  • Figure 4A is a partial cross-section of the embodiment of Figure 4 ; 12
  • Figure 4B is a partial cross-section similar to that of Figure 4A of alternative embodiment of resonant stretched panel acoustic member
  • Figures 5A,B are graphs showing frequency response of respective resonant panel members of A4 and A5 size, respectively, and in which the heavy line traces represent a clamped edge panel and the fine line traces represent a free or resiliently edge suspended panel;
  • Figures 6A,B and 7A,B and 8A,B are graphical representations for mechanical impedance against frequency for selected aspect ratios of clamped edge panel members
  • Figures 9A,B,C are graphical representations of related smoothed inverse mean square deviation for location of transducer means;
  • Figure 10 is a calculated quarter panel mechanical impedance plot for one clamped edge panel member;
  • Figure 11 is a graphical representation for various clamped edge panel aspect ratios
  • Figures 12A-H are measured quarter panel mechanical impedance plots for various aspect ratios
  • Figures 13A-H are related acoustic output plots as fitted to a reference value
  • Figure 14 plots maximum inverse mean square power deviation for different aspect ratios
  • Figures 15A-J are combination polar plots of acoustic output for lower resonant modes of a 1:3 aspect ratio clamped edge panel member
  • Figures 16A-D are acoustic output power comparison 13
  • the acoustic member may be and are shown as substantially rectangular and may have aspect ratios as considered preferential in W097/09842, though much wider ranges of aspect ratios will be shown to have useful potential within a general objective to obtain high modal density and even-ness of modal spread in the member .
  • Figures 4 and 4A show an embodiment of resonant acoustic member 40 stretched over a rectangular perimeter frame 41 and clamped to the rectangular perimeter frame by a clamping frame 42 to hold the acoustic member in place. Tensioning force is applied to the member 40 in the direction of arrow F.
  • the clamping frame 42 may be replaced by tensioning means 43, e.g. including tension springs 44 on a frame 45, the tensioning means being fixed to the edge of the acoustic member to stretch the member over the rectangular perimeter frame.
  • Vibration exciters may be located on the acoustic members in the embodiments of Figures 4 , 4A and 4B to excite resonance in the acoustic members to produce an acoustic output so that the acoustic members can act as loudspeakers or loudspeaker drive units.
  • These vibration exciters are not shown in Figures 4 , 4A and 4B in the interests of clarity.
  • the stiffness of a clamped edge panel of the same general kind may be lower by at least one order of magnitude, even as low as O.OOlNm.
  • the range of surface density of the said practical example of free edge panels may be 100 to 1000 g/m 2
  • the surface density of clamped edge panels may be only a fraction, even as low as
  • panel materials of relatively low rigidity can result in higher coincidence frequency, e.g. above the normal audio band, which may improve the uniformity of sound directivity from resonant loudspeaker panel. Also, less rigid panels, can afford effective augmentation of modal density in the lower registers, consequently improved 15
  • Useful variants to the fully peripherally edge/ boundary-restraint/clamping as illustrated include any effective lesser extent of substantial restraint/clamping which, for substantially rectangular panel member/active area, could be one side by omission of what is shown for three sides, or two typically parallel sides by omission of what is shown for other two sides.
  • Acoustic radiating members hereof may be excited in any of the ways suggested in W097/09842, e.g. by way of at least one inertial electro-mechanical exciter device.
  • the or each exciter device may be arranged to excite the radiating member at any suitable geometric position (s) areally of the acoustic member; whether according to principles as in W097/09842 or in accordance with mechanical impedance analysis as in PCT/GB99/00404 or as determined experimentally.
  • Such vibration exciters have been omitted from Figure 1 in the interests of clarity.
  • W097/09842 as to applicable kinds of exciters, and the positioning of such exciters may be as determined in accordance with the same principles as taught in W097/09842 and/or PCT/GB99/00404 , usually with difference available for actual locations compared with WO97/09842.
  • Figures 6A,B and 7A, B and 8A,B for mechanical impedance with frequency for panel members of selected aspect ratios and isotropic as to bending stiffness are accompanied by graphical representations of Figures 9A, B, C for smoothed mechanical impedance as measured by inverse square of mean standard deviation for location of particular promising transducer locations.
  • Precisely calculated favourable aspect ratios 1.160, 1.341 and 1.643 are revealed together with likewise precisely calculated preferential transducer location coordinates (0.437, 0.414), (0.385, 0.387) and (0.409, 0.439), respectively.
  • Figure 10 is a calculated quarter- panel mechanical impedance plot for the aspect ratio 1.16 and shows substantial extent of areas promising for transducer location, even two such separate areas (cross- hatched) .
  • Figure 11 gives comparison of such preferential clamped edge aspect ratios and transducer locations, including further for aspect ratio 1.138. 17
  • the first effective resonant mode frequency for a fully edge-clamped resonant panel member effectively requires contribution by the first resonant mode attributable to the shorter edge length, i.e. the first combination mode for plate vibration action for the two series (fx x , fx 2 :...fx n ) and (fyi, fy 2 ... fy m ) for the edge-parallel axes x,y as represented by the resonant mode spectrum equation: 19
  • FIGS. 15A-J are combination polar plots for one resonant panel member of aspect ratio 1:3 for the lower resonant mode frequencies, respectively; and in each case show landscape (solid) and portrait (dashed) planes, i.e. with longer dimension horizontal or vertical, respectively.
  • the radiation patterns are significantly different, that in the plane of the smaller length being generally smoother, and that in the plane of the longer length being more diffuse.
  • Design options include acceptability of higher frequency of lowest resonant mode, as directly dependent for any particular panel member structure on aspect ratio; acceptability of directionality where panel member vibration is markedly different in different axial directions; consequentially different power smoothness in corresponding radiation planes; related selection of orientation or attitude of the panel member as 21
  • the panel member of Figure 16A comprises 0.05mm thick black glass skins on 4mm thick Aluminium honeycomb, resulting in substantially isotropic bending stiffness of 12.26 Newtonmetres, mass density of 0.76 Kilogram/square metre, and coincidence frequency of 4.6kHz.
  • the panel member of Figure 16B comprises 0.102mm thick black glass skins on 1.8mm thick Rohacell core, resulting in substantially isotropic bending stiffness of 2.47 Newtonmetres, mass density of 0.60 Kilogram/square metre, and coincidence frequency of 9.1kHz.
  • the panel member of Figure 16C comprises 0.05mm thick MelinexTM skins on 1.5mm Rohacell core, resulting in substantially isotropic bending stiffness of 0.32 Newtonmetre, mass density of 0.35 Kilogram/square metre, and coincidence frequency of 19.2kHz.
  • These panel members are all of similar aspect ratio between 1.13 and 1.14 and driven with like exciters of 13mm active diameter and input impedance of 8 ohms.
  • Each had acoustic power output measured with all panel edges free to vibrate for resonant bending wave action of the panels, and with all edges clamped against such vibration.
  • Figures 16A-C show that clamping achieves substantial increase in acoustic output power below coincidence frequency, though not above, so there is greater beneficial 22
  • the panel members for Figures 16D-E are of the same stiffest structure as Figure 16A, but of larger sizes, namely 360mm x 315mm and 545mm x 480mm, respectively compared with 260mm x 230mm for Figures 16A to D; and there is confirmation of full clamping producing improved acoustic output power from coincidence frequency down to the lowest resonant mode frequency of the panel member concerned specifically to about 400Hz for the smallest panel members ( Figures 16A-C) and lower for the larger and largest panel members. It is also worth noting that the larger the panel members the closer the mode shapes for given frequency approximate to a sine wave.

Abstract

Ce dispositif acoustique comporte un élément reposant sur l'action d'une onde de flexion avec répartition avantageuse des modes résonnants de celle-ci. La région active du point de vue acoustique de cet élément est, au moins en partie, encadrée par des moyens de nature sensiblement restrictive relativement à la vibration de l'onde de flexion. Le dispositif est susceptible de fonctionner, le cas échéant, en dessous ou au-dessus de la fréquence de coïncidence et ce, pour un dispositif acoustique actif dont les structures de transduction d'onde de flexion sont avantageusement situées, cet emplacement étant déterminé en tenant compte de l'encadrement.
EP99910539A 1998-04-02 1999-03-30 Dispositif acoustique ayant recours a l'action d'une onde de flexion Expired - Lifetime EP1068770B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9806994 1998-04-02
GBGB9806994.1A GB9806994D0 (en) 1998-04-02 1998-04-02 Acoustic device
PCT/GB1999/000848 WO1999052324A1 (fr) 1998-04-02 1999-03-30 Dispositif acoustique ayant recours a l'action d'une onde de flexion

Publications (2)

Publication Number Publication Date
EP1068770A1 true EP1068770A1 (fr) 2001-01-17
EP1068770B1 EP1068770B1 (fr) 2005-04-27

Family

ID=10829678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910539A Expired - Lifetime EP1068770B1 (fr) 1998-04-02 1999-03-30 Dispositif acoustique ayant recours a l'action d'une onde de flexion

Country Status (27)

Country Link
EP (1) EP1068770B1 (fr)
JP (1) JP4258696B2 (fr)
KR (1) KR20010042428A (fr)
CN (1) CN1143593C (fr)
AR (1) AR018832A1 (fr)
AT (1) ATE294492T1 (fr)
AU (1) AU746216B2 (fr)
BG (1) BG104810A (fr)
BR (1) BR9909901A (fr)
CA (1) CA2326161A1 (fr)
CO (1) CO4830489A1 (fr)
CZ (1) CZ300065B6 (fr)
DE (1) DE69924990T2 (fr)
EA (1) EA003215B1 (fr)
GB (2) GB9806994D0 (fr)
HK (1) HK1032504A1 (fr)
HU (1) HUP0102859A3 (fr)
ID (1) ID27055A (fr)
IL (1) IL138312A0 (fr)
NO (1) NO20004921L (fr)
NZ (1) NZ506731A (fr)
PL (1) PL343115A1 (fr)
SK (1) SK14552000A3 (fr)
TR (1) TR200002878T2 (fr)
TW (1) TW475340B (fr)
WO (1) WO1999052324A1 (fr)
ZA (1) ZA200004746B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10362395B2 (en) 2017-02-24 2019-07-23 Nvf Tech Ltd Panel loudspeaker controller and a panel loudspeaker

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19922395C1 (de) * 1999-05-14 2001-01-11 Harman Audio Electronic Sys Deckenelement
DE19955867A1 (de) * 1999-11-22 2001-06-21 Harman Audio Electronic Sys Flachlautsprecheranordnung für Tieftonwiedergabe
GB0010998D0 (en) * 2000-05-08 2000-06-28 New Transducers Ltd Acoustic device
TW498698B (en) * 2000-05-08 2002-08-11 Koninkl Philips Electronics Nv Loudspeaker having an acoustic panel and an electrical driver
US6826285B2 (en) 2000-08-03 2004-11-30 New Transducers Limited Bending wave loudspeaker
GB0018996D0 (en) * 2000-08-03 2000-09-20 New Transducers Ltd Bending wave loudspeaker
DE10058102C2 (de) * 2000-11-23 2003-07-03 Harman Audio Electronic Sys Elektrodynamischer Biegemomententreiber
US7548854B2 (en) 2002-01-31 2009-06-16 Awi Licensing Company Architectural sound enhancement with pre-filtered masking sound
US6983819B2 (en) 2002-04-02 2006-01-10 Awi Licensing Company Entertainment sound panels
SE523321C2 (sv) * 2002-06-20 2004-04-13 Covial Device Ab Sätt och anordning för avkänning och indikering av akustisk emission
US8054194B2 (en) 2003-02-10 2011-11-08 Autronic Plastics, Inc. System and method for verifying a security status of a lockable container
GB0405475D0 (en) * 2004-03-11 2004-04-21 New Transducers Ltd Loudspeakers
DE102004028664A1 (de) * 2004-06-12 2006-01-19 Puren Gmbh Schwingungskörper eines Lautsprechersystems
US10848118B2 (en) 2004-08-10 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
US8284955B2 (en) 2006-02-07 2012-10-09 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing
US10848867B2 (en) 2006-02-07 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
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
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
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
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
US9154885B2 (en) 2012-08-10 2015-10-06 Kyocera Corporation Sound generator, sound generation device, and electronic apparatus
US9883318B2 (en) 2013-06-12 2018-01-30 Bongiovi Acoustics Llc System and method for stereo field enhancement in two-channel audio systems
US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
US9906858B2 (en) 2013-10-22 2018-02-27 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
US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
US9615813B2 (en) 2014-04-16 2017-04-11 Bongiovi Acoustics Llc. Device for wide-band auscultation
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
US9621994B1 (en) 2015-11-16 2017-04-11 Bongiovi Acoustics Llc Surface acoustic transducer
JP2018537910A (ja) 2015-11-16 2018-12-20 ボンジョビ アコースティックス リミテッド ライアビリティー カンパニー 表面音響変換器
GB2551723B (en) * 2016-06-27 2018-11-28 Amina Tech Limited Speaker Panel
AU2019252524A1 (en) 2018-04-11 2020-11-05 Bongiovi Acoustics Llc Audio enhanced hearing protection system
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247925A (en) * 1962-03-08 1966-04-26 Lord Corp Loudspeaker
DE1132593B (de) * 1965-04-05 1962-07-05 Bolt Beranek & Newman Akustisch wirksame Platte, insbesondere zur Ankopplung an einen elektroakustischen Wandler
ATE117155T1 (de) * 1990-08-04 1995-01-15 Secr Defence Brit Paneelförmiger lautsprecher.
DK0847664T3 (da) * 1995-09-02 1999-11-08 New Transducers Ltd Højttaler omfattende akustisk udstrålende elementer i form af paneler
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій
ATE177574T1 (de) * 1995-09-02 1999-03-15 New Transducers Ltd Lautsprecher mit plattenförmigen abstrahlelementen
GB9704486D0 (en) * 1997-03-04 1997-04-23 New Transducers Ltd Acoustic devices etc
DE19757098C2 (de) * 1997-12-20 2003-01-09 Harman Audio Electronic Sys Aufhängung für Schallwiedergabeanordnungen nach dem Biegewellenprinzip

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9952324A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10362395B2 (en) 2017-02-24 2019-07-23 Nvf Tech Ltd Panel loudspeaker controller and a panel loudspeaker
US10986446B2 (en) 2017-02-24 2021-04-20 Google Llc Panel loudspeaker controller and a panel loudspeaker

Also Published As

Publication number Publication date
JP2002511682A (ja) 2002-04-16
HUP0102859A3 (en) 2003-03-28
GB0020986D0 (en) 2000-10-11
KR20010042428A (ko) 2001-05-25
BR9909901A (pt) 2000-12-26
GB9806994D0 (en) 1998-06-03
CZ20003591A3 (cs) 2001-01-17
EA200001016A1 (ru) 2001-02-26
CN1296720A (zh) 2001-05-23
CN1143593C (zh) 2004-03-24
JP4258696B2 (ja) 2009-04-30
NO20004921L (no) 2000-11-28
GB2350008A (en) 2000-11-15
PL343115A1 (en) 2001-07-30
ATE294492T1 (de) 2005-05-15
AU746216B2 (en) 2002-04-18
TR200002878T2 (tr) 2001-01-22
IL138312A0 (en) 2001-10-31
CA2326161A1 (fr) 1999-10-14
DE69924990T2 (de) 2006-02-23
AR018832A1 (es) 2001-12-12
CO4830489A1 (es) 1999-08-30
ZA200004746B (en) 2001-06-27
ID27055A (id) 2001-02-22
GB2350008B (en) 2001-05-02
AU2947199A (en) 1999-10-25
HK1032504A1 (en) 2001-07-20
NZ506731A (en) 2003-02-28
EA003215B1 (ru) 2003-02-27
EP1068770B1 (fr) 2005-04-27
CZ300065B6 (cs) 2009-01-21
BG104810A (bg) 2001-07-31
TW475340B (en) 2002-02-01
DE69924990D1 (de) 2005-06-02
NO20004921D0 (no) 2000-09-29
HUP0102859A2 (hu) 2001-12-28
WO1999052324A1 (fr) 1999-10-14
SK14552000A3 (sk) 2001-05-10

Similar Documents

Publication Publication Date Title
EP1068770B1 (fr) Dispositif acoustique ayant recours a l'action d'une onde de flexion
US6546106B2 (en) Acoustic device
EP1723826B1 (fr) Haut-parleurs
US7110561B2 (en) Transparent panel-form loudspeaker
EP0965245B1 (fr) Dispositif acoustique
CA2229998C (fr) Dispositif acoustique
JP3084281B2 (ja) パネル形スピーカ
EP1800514B1 (fr) Dispositif d'affichage comprenant un transducteur acoustique a panneau, et transducteur acoustique a panneau transparent
US6282298B1 (en) Acoustic device
EP1385354A1 (fr) Haut-parleur transparent en forme de panneau
MXPA00009685A (en) Acoustic device relying on bending wave action
NZ509425A (en) A loudspeaker drive unit actuator for driving a diaphragm
AU5400401A (en) Acoustic device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20000911

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR IE IT LI NL PT SE

AX Request for extension of the european patent

Free format text: RO PAYMENT 20000911;SI PAYMENT 20000911

RBV Designated contracting states (corrected)

Designated state(s): AT BE CH DE DK ES FI FR IE IT LI NL PT SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NEW TRANSDUCERS LIMITED

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FI FR IE IT LI NL PT SE

AX Request for extension of the european patent

Extension state: RO SI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050427

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050427

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050427

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050427

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050427

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050427

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69924990

Country of ref document: DE

Date of ref document: 20050602

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050727

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20050807

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051010

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060330

ET Fr: translation filed
26N No opposition filed

Effective date: 20060130

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: HK

Ref legal event code: WD

Ref document number: 1030128

Country of ref document: HK

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20090317

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090312

Year of fee payment: 11

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20101001

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20101130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101001

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100331

REG Reference to a national code

Ref country code: FR

Ref legal event code: RN

REG Reference to a national code

Ref country code: FR

Ref legal event code: D5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20140328

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69924990

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151001

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230520