EP1050190B1 - Active acoustic devices comprising panel members - Google Patents

Active acoustic devices comprising panel members Download PDF

Info

Publication number
EP1050190B1
EP1050190B1 EP99901055A EP99901055A EP1050190B1 EP 1050190 B1 EP1050190 B1 EP 1050190B1 EP 99901055 A EP99901055 A EP 99901055A EP 99901055 A EP99901055 A EP 99901055A EP 1050190 B1 EP1050190 B1 EP 1050190B1
Authority
EP
European Patent Office
Prior art keywords
panel member
transducer
acoustic device
active acoustic
distributed mode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99901055A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1050190A1 (en
Inventor
Farad Azima
Henry Azima
Martin Colloms
Graham Bank
Nicholas Patrick Roland Hill
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
Priority claimed from GBGB9801054.9A external-priority patent/GB9801054D0/en
Priority claimed from GBGB9801057.2A external-priority patent/GB9801057D0/en
Priority claimed from GBGB9811100.8A external-priority patent/GB9811100D0/en
Priority claimed from GBGB9813293.9A external-priority patent/GB9813293D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Priority to EP04075008A priority Critical patent/EP1414266B1/en
Publication of EP1050190A1 publication Critical patent/EP1050190A1/en
Application granted granted Critical
Publication of EP1050190B1 publication Critical patent/EP1050190B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
    • 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
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/05—Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

  • This invention relates to active acoustic devices and more particularly to panel members for which acoustic action or performance relies on beneficial distribution of resonant modes of bending wave action in such a panel member and related surface vibration.
  • distributed mode for such acoustic devices, including acoustic radiators or loudspeakers; and for the term “panel-form” to be taken as inferring such distributed mode action in a panel member unless the context does not permit.
  • such panel members operate as distributed mode acoustic radiators relying on bending wave action induced by input means applying mechanical action to the panel member; and resulting excitation of resonant modes of bending wave action causing surface vibration for acoustic output by coupling to ambient fluid, typically air.
  • Revelatory teaching regarding such acoustic radiators is given in our International patent application WO97/09842; and various of our later patent applications concern useful additions and developments.
  • transducer locations have been considered as viably and optimally effective at locations in-board of the panel member to a substantial extent towards but offset from its centre, at least for panels that are substantially isotropic as to bending stiffness and exhibit effectively substantially constant axial anisotropy of bending stiffness (es).
  • Aforementioned WO97/09842 gives specific guidance in terms of optimal proportionate co-ordinates for such in-board transducer locations, including alternatives; and preference for different particular co-ordinate combinations when using two or more transducers.
  • a distributed mode active acoustic device comprising a substantially rectangular panel member and a transducer coupled to the panel member, the panel member being capable of sustaining bending waves in an operative frequency range over an active area of the transverse extent of the panel member with a distribution of resonant modes of bending wave vibration determining acoustic performance in conjunction with the transducer, the panel member having certain physical parameters the values of which affect said distribution of resonant modes, said parameters having selected values such that said resonant modes are beneficially distributed in frequency over said active area, and the panel member further having at least one in-board location of said active area where a plurality of resonant bending wave modes over the operative frequency range have vibrationally active anti-nodes, the transducer being coupled to the panel member at a marginal position of the panel member for beneficial operative interaction of the transducer with the panel member, said marginal position having an orthogonal coordinate of said at least one in-board location itself having orthogonal coordinates defined relative to
  • a suitable acoustic panel member may be transparent or translucent.
  • Plural transducer means may be at or near different edges, at least for substantially rectangular panel members.
  • the or each transducer may be piezo-electric, electrostatic or electro-mechanical.
  • the or each transducer may be arranged to launch compression waves into the panel edge, and/or to deflect the panel edge laterally to launch transverse bending waves along a panel edge, and/or to apply torsion across a panel corner, and/or to produce linear deflection of a local region of the panel.
  • Assessment of acoustic output from panel members may be relative to suitable criteria for acoustic output include as to amount of power output thus efficiency in converting input mechanical vibration (automatically also customary causative electrical drive) into acoustic output, smoothness of power output as measure of even-ness of excitation of resonant mode of bending wave action, inspection of power output as to frequencies of excited resonant modes including number and distribution or spread of those frequencies, each up to all as useful indicators.
  • Such assessments of viability of locations for transducer means constitute method aspects of this invention individually and in combination.
  • mean square deviation assessment As aid to assessment at least of smoothness of power output, it is further proposed herein to use techniques based on mean square deviation from some reference.
  • Use of the inverse of mean square deviation has the benefit of presenting smoothness for assessment according directly to positive values and/or representations.
  • a suitable reference can be individual to each case considered, say a median-based, such as represented graphically by a smoothed line through actual measured power output over a frequency range of interest. It is significantly helpful to mean square deviation assessment for the reference to have a be normalised standard format; and for the measured acoustic power output to be adjusted to fit that standard format.
  • the standard format may be a graphically straight line, preferably a flat straight line thus corresponding to some particular constant reference value; further preferably the same line or value as found naturally to apply to a distributed mode panel member at higher frequencies where modes and modal action are more or most dense.
  • This lower acoustic power output at lower frequencies is related to free edge vibration of the panel members as such, and consequential greater loss of lower frequency power, greater proportion of which tends to be poorly radiated and/or dissipated, including effectively short-circuited about free adjacent panel edges.
  • these lower frequency power loss effects are significantly greater for panel members with transducer locations at or near their edges and/or lesser stiffnesses - compared with panel members using in-board transducer locations .
  • significant mitigation of these effects is available by mounting the panel members surrounded by baffles and/or by clamping at the edges of the panel members. Indeed, spaced localised edge clamps can have usefully selectively beneficial effects relative to frequencies with wavelengths greater than the spacing of the localised edge clamps.
  • Inventive aspects thus includes association of a said drive means position with helpful other mass-loading or clamping position marginal of the panel member.
  • the operating frequency range of interest should be made part of assessment of location for transducer means, and may well affect best and viable such locations, i.e. could be different for ranges wholly above and extending below such as 500 Hz.
  • Another influencing factor could be presence of an adjacent surface, say behind the panel member at a spacing affecting acoustic performance.
  • distributed mode acoustic panel loud-speaker 10 is as described in WO97/09842 with panel member 11 having typical optimal near- (but off-) centre location for drive means transducer 12.
  • the sandwich structure shown with core 14 and skins 15, 16 is exemplary only, there being many monolithic and/or reinforced and other structural possibilities. In any event, normal in-board transducer placement potentially limits clear area available, e.g. for such as transmission of light in the case of a transparent or translucent panel.
  • Mainly transparent or translucent resonant mode acoustic panel members might use known transparent piezo-electric transducers, e.g. of lanthanum doped' titanium zirconate.
  • these are relatively costly, hence the alternative approach thereof by which it is possible to leave the resonant mode acoustic panel member 10 mainly clear and unobstructed by optimising loudspeaker design from a choice of four types of excitation shown in Figure 2 directed to the margins or perimeter of the panel, and labelled as types T1 - T4, as follows:
  • Figure 3 is a scrap view of composite panel 11 showing high tensile skins 15, 16 and structural core 14 with drive transducers/exciters 31 - 34 for the above-mentioned four types T1 - T4 of edge/marginal drive.
  • fewer than four drive types might be used at the same time on a panel which can usefully be acoustically and mechanically optimised for the desired bandwidth of operation and for the particular type of drive employed.
  • an optimised panel may be driven by any one or more of the different drive types.
  • a transparent or translucent edge-driven acoustic panel could be monolithic, e.g. of glass, or of skinned core structure using suitable translucent/transparent core and skin materials, see Figure 11.
  • a visual display unit may enable the screen also to be used as a loudspeaker, can have suitably high bending stiffness along with low mass if comprising a pair of skins 15A, 16A sandwiching a lightweight core of aerogel material 14A using transparent adhesive 15B, 16B.
  • Aerogel materials are extremely light porous solid materials, say of silica.
  • Transparent or translucent skin or skins may be of laminated structure and/or made from transparent plastics material such a polyester, or from glass.
  • a particular suitable silica aerogel core material is (RTM) BASOGEL from BASF.
  • Other feasible core materials could include less familiar aerogel-forming materials including metal oxides such as iron and tin oxide, organic polymers, natural gels, and carbon aerogels.
  • a particular suitable plastics skin laminates may be of polyethylene terephthalate (RTM) MYLAR, or other transparent materials with the correct thickness, modulus and density. Very high shear modulus of aerogels allow extremely thin composites to be made to suit miniaturisation and other physically important factors and working under distributed mode acoustic principles.
  • such transparent panel could be added to an existing VDU panel, say incorporated as an integral front plate.
  • a plasma type display the interior is held at low gas pressure, close to vacuum, and is of very low acoustic impedance. Consequently there will be negligible acoustic interaction behind the sound radiator, resulting in improved performance, and the saving of the usual front plate.
  • the front transparent window may be built using a distributed mode radiator while the display structures behind may be dimensioned and specified to include acoustic properties which aid the radiation of sound from the front panel. For example partial acoustic transparency for the rear display structures will reduce back wave reflection and improve performance for the distributed mode speaker element. In the case of the light emitting class of display, these may be deposited on the rear surface of the transparent distributed mode panel, without significant impediment to its acoustic properties, the images being viewed from the front side.
  • a transparent distributed mode loudspeaker may also have application for rear projection systems where it may be additional to a translucent screen or this function may itself be incorporated with a suitably prepared surface for rear projection.
  • the projection surface and the screen may be one component both for convenience and economy but also for optimising acoustic performance.
  • the rear skin may be selected to take a projected image, or alternatively, the optical properties of the core may be chosen for projection use. For example in the case of a loudspeaker panel having a relatively thin core, full optical transparency may not be required or be ideal, allowing the choice of alternative light transmitting cores, e.g. other grades of aerogel or more economical substitutes. Special optical properties may be combined with the core and/or the skin surface to generate directional and brightness enhancing properties for the transmitted optical images.
  • the transparent distributed mode speaker may be enhanced, for example, by the provision of conductive pads or regions, visible, or transparent, for user input of data or commands to the screen.
  • the transparent panel may also be enhanced by optical coatings to reduce reflections and/or improve scratch resistance, or simply by anti scratch coatings.
  • the core and skin for the transparent panel may be selected to have an optical tint, for colour shading or in a neutral hue to improve the visual contrast ratios for the display used with or incorporated in the distributed mode transparent panel speaker.
  • invisible wiring e.g. in the form of micro-wires, or transparent conductive films, may be incorporated together with indicators, e.g.
  • LED light emitting diodes
  • LCD liquid crystal displays
  • the transducers may be piezo-electric or electrodynamic according to design criteria including price and performance considerations, and are represented in Figure 3 as simple outline elements simply bonded to the panel by suitable adhesive(s).
  • inertial transducer 31 is shown driving vertically directed compression waves into the panel 30.
  • bending type of transducer 32 is shown operative for directly bending regionally to launch bending waves through the loudspeaker panel 30.
  • inertial transducer 33 is shown serving to deflect the panel corner in driving into the diagonal and thence into the whole loudspeaker panel 30.
  • another inertial transducer 34 is shown of block or semi-circular form serving to deflect an edge of the loudspeaker panel 30.
  • Each type of excitation will engender its own characteristic drive to the panel 30 which is accounted for in the overall loudspeaker design including parameters of the panel 30 itself.
  • the placement of the transducers 31 - 34 along the panel edge is in practice iterated with the panel design parameters for optimum or at least operationally acceptable modal distribution of bending waves. It is envisaged that, according to the panel characteristics, including such as controlled loss for example, and the location(s) and type(s) of marginal edge or near-edge drive, more than one audio channel may be applied to the panel 30 concerned, e.g. via plural drive transducers.
  • This multi-channel potential may be augmented by signal processing to optimise the sound quality, and/or to control the sound radiation properties and/or even to modify the perceived channel-to-channel separation and spatial effects.
  • Pairing can be one from each co-ordinate, i.e. CP1 and CP2, CP2 and CP3, CP3 and CP4, CP4 and CP1, and a first favoured pairing is the one notionally defining included area that is greatest, indeed, contains the geometrical centre X. Such notional area will, of course, further pass through or contain other usual optimal or preferential in-board drive transducer position, see complementary location CL and indication at CP5 and CP6 for the first favoured pairing of drive transducer locations.
  • Figure 7 shows a panel-form loudspeaker 80 having an in-board unobstructed region 81 extending throughout and beyond normal in-board preferential drive transducer locations, and a marginally located transducer 82.
  • the region 81 may serve for display purposes directly, or represent something carried by the panel 80 without affecting acoustic performance, or something behind which the loudspeaker panel 80 passes, say in close spacing and/or transparent or translucent. Both of loudness and quality are readily enhanced, the former by additional drive transducers judiciously placed (not shown), and quality by localised edge clamping(s) 83 beneficially to control particular modal vibration points effectively as panel termination(s).
  • the panel 80 is further indicated with localised resilient suspensions 84 located neutrally or even beneficially regarding achieved acoustic performance.
  • High pass filtering 85 is preferred for input signals to drive transducer(s) 82, conveniently to limit to range of best reproduction, say not below 100Hz for A4-size or similar panels. Then, there should not be any problematic low-frequency panel/exciter vibration.
  • acoustic performance it is advantageous in terms for acoustic performance to control acoustic impedance loading on the panel 80, say to be relatively low in the marginal or peripheral region, especially in the vicinity of the drive transducer(s) 82 where surface velocity tends to be high.
  • Beneficial such control provision includes significant clearance to local planar members (say about 1 - 3 centimetre) and/or slots or other apertures in adjacent peripheral framing or support provision or grille elements.
  • Resulting effective concentration of acoustic radiation to marginal regions about plural drive transducers particularly facilitates reproduction of more than one sound channel, at least for near-field listening as for playing computer games or like localised virtual sound stage applications. Further away, merging even of multiple as-energised sound sources need not be problematic when summed, at least for such as audio visual presentations.
  • Figures 8-11 relate to the higher stiffness panel member of the first column, Figures 12-20 to the much lower stiffness panel member of the second column, and Figures 21-24 to the intermediate stiffness panel member of the third column.
  • trial positions for transducer edge or near edge location are based on spacing substantially corresponding to the difference between the preferential co-ordinate value of 0.42 for in-board transducer location and the mid-point (0.5) of the edge, albeit with alternate spacings increased to 0.09. Usual trial locations are thus 0.08, 0.17, 0.28, 0.33, 0.42, 0.50.
  • the other two tested panel members of much lower and intermediate stiffnesses also show the same in-board co-ordinate preference on a smoothness of power basis, aee Figures 12 and 21.
  • the lower stiffness panel member shows another band of nearly as promising locations ranging from about quarter to below tenth length from corners.
  • assessment is based on efficiency, i.e. amount of power output - as would be the case for a median line through the true output power plot being the basis used for mean square deviation - the above band becomes skewed to emphasise the quarter length position and is mostly preferential to the in-board coordinate related position, see inverse mean square deviation bar chart of Figure 27A.
  • the intermediate stiffness panel member veers towards the characteristic of the higher stiffness panel member in showing a promising spread between the in-board preferential coordinate positions, but also shows promise at about the one-tenth length positions.
  • Figures 15A, B, C give indication of generally beneficial raising of lower frequency output for surrounding baffling with an area over 60% greater than the low stiffness panel, rigid clamping of all three edges not affording transducer location, and both of such baffling and clamping.
  • Such baffling tends to maintain modality but may not always be feasible in specific applications. Accordingly, full investigation of clamping seemed worthwhile for alternative transducer edge locations for the lower stiffness panel member.
  • Figures 10A, 11A one transducer means is located at a position within the tolerance range of about 0.38-0.45 for the 0.42 preferred position for single transducer means along the longer edge.
  • Second transducer means is varied along the closest shorter edge and Figure 11A shows marginal preference for the furthest 0.42 preferred position, i.e. centred at 0.58, compared with several other positions at about quarter, third and two-thirds lengths from the common corner.
  • Figures 13A, B show results of investigation of the much lower stiffness panel member with the preferred about 0.42 transducer location used for the longer edge and a second transducer varied along the nearest shorter edge. There were no great differences in power smoothness increase, the best three approaching corners and the nearest 0.42 preferential position, with some otherwise general preference for associations being in some quadrant.
  • the mechanical impedance (Zm) of a panel member determines the movement resulting for an applied point force, see 100, 101 in Figure 26.
  • An object associated with the panel with a mechanical impedance put very much less than, even approaching comparable to, the panel impedance will strongly offset panel motion where the object is located.
  • Associating an exciting transducer of moving coil type with the panel is equivalent to connecting the panel to a grounded mass (the magnet cup of the transducer, see 102) via a spring (the voice coil suspension of the transducer, see 108).
  • the impedance of such spring is too close to the panel impedance, it will in some part determine the panel motion at the transducer. In the limit of this spring wholly determining the point motion at the transducer, there would be no dependence of input power on exciter position.
  • the transducer in part determines the impedance of the panel member, and smoothness of the output power is less dependent on the position of the transducer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP99901055A 1998-01-20 1999-01-15 Active acoustic devices comprising panel members Expired - Lifetime EP1050190B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04075008A EP1414266B1 (en) 1998-01-20 1999-01-15 Active acoustic devices

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GBGB9801054.9A GB9801054D0 (en) 1998-01-20 1998-01-20 Acoustic panels
GBGB9801057.2A GB9801057D0 (en) 1998-01-20 1998-01-20 Acoustic panels
GB9801057 1998-01-20
GB9801054 1998-01-20
GB9811100 1998-05-23
GBGB9811100.8A GB9811100D0 (en) 1998-05-23 1998-05-23 Acoustic panels
GB9813293 1998-06-20
GBGB9813293.9A GB9813293D0 (en) 1998-06-20 1998-06-20 Acoustic panels
PCT/GB1999/000143 WO1999037121A1 (en) 1998-01-20 1999-01-15 Active acoustic devices comprising panel members

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP04075008A Division EP1414266B1 (en) 1998-01-20 1999-01-15 Active acoustic devices

Publications (2)

Publication Number Publication Date
EP1050190A1 EP1050190A1 (en) 2000-11-08
EP1050190B1 true EP1050190B1 (en) 2004-10-20

Family

ID=27451742

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99901055A Expired - Lifetime EP1050190B1 (en) 1998-01-20 1999-01-15 Active acoustic devices comprising panel members
EP04075008A Expired - Lifetime EP1414266B1 (en) 1998-01-20 1999-01-15 Active acoustic devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04075008A Expired - Lifetime EP1414266B1 (en) 1998-01-20 1999-01-15 Active acoustic devices

Country Status (23)

Country Link
EP (2) EP1050190B1 (ja)
JP (1) JP4173283B2 (ja)
KR (1) KR100646191B1 (ja)
CN (1) CN1287766B (ja)
AR (1) AR014430A1 (ja)
AT (1) ATE280482T1 (ja)
AU (1) AU747693B2 (ja)
BG (1) BG104543A (ja)
BR (1) BR9907145A (ja)
CA (1) CA2318292A1 (ja)
DE (2) DE69921295T8 (ja)
EA (1) EA200000781A1 (ja)
HK (1) HK1029247A1 (ja)
HU (1) HUP0102858A3 (ja)
IL (1) IL136820A0 (ja)
NO (1) NO20003705L (ja)
NZ (1) NZ504133A (ja)
PL (1) PL341377A1 (ja)
SK (1) SK10822000A3 (ja)
TR (1) TR200002108T2 (ja)
TW (1) TW432889B (ja)
WO (1) WO1999037121A1 (ja)
YU (1) YU36800A (ja)

Families Citing this family (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR019105A1 (es) * 1998-04-28 2001-12-26 New Transducers Ltd Metodo para determinar el emplazamiento o emplazamientos ventajosos para posicionar un dispositivo transductor de ondas de flexion.
AU756783B2 (en) 1998-06-22 2003-01-23 Slab Technology Limited Loudspeakers
YU101A (sh) * 1998-07-03 2002-11-15 New Transducers Limited Rezonantni zvučnik oblika ploče
JP2000092578A (ja) * 1998-09-09 2000-03-31 Fujitsu Ltd スピーカ装置
DE19917584A1 (de) * 1999-04-19 2000-10-26 Siemens Ag Flächenlautsprecher und Verfahren zu dessen Betrieb
JP3512087B2 (ja) * 1999-06-15 2004-03-29 日本電気株式会社 パネルスピーカ
JP3591578B2 (ja) 1999-11-09 2004-11-24 ヤマハ株式会社 音響放射体
TW511391B (en) 2000-01-24 2002-11-21 New Transducers Ltd Transducer
US7151837B2 (en) 2000-01-27 2006-12-19 New Transducers Limited Loudspeaker
US6721436B1 (en) * 2000-03-29 2004-04-13 Sound Advance Systems, Inc. Remote edge-driven panel speaker
JP4683367B2 (ja) * 2000-08-04 2011-05-18 ヤマハ株式会社 線状加振装置及び該加振装置を備えたスピーカ
GB0019701D0 (en) * 2000-08-11 2000-09-27 New Transducers Ltd Loudspeaker
GB0022913D0 (en) * 2000-09-19 2000-11-01 New Transducers Ltd Loudspeaker
GB2369232B (en) * 2000-11-18 2005-01-12 Talksign Ltd Display signs
JP2004527971A (ja) * 2001-05-11 2004-09-09 ニュー トランスデューサーズ リミテッド ラウドスピーカ
FR2825882B1 (fr) * 2001-06-12 2003-08-15 Intelligent Vibrations Sa Vitrage interactif avec fonctions microphones et haut-parleur
EP1274272A1 (en) * 2001-06-19 2003-01-08 Chao-Hsien Lin The application of invisible speaker and the method for fabricating the same
DE60226098T2 (de) 2001-06-28 2009-06-18 Panasonic Corp., Kadoma Lautsprechersystem, Mobilendgerät und elektronische Vorrichtung
DE10164509A1 (de) * 2001-12-28 2003-07-17 Webasto Vehicle Sys Int Gmbh Lautsprechersystem für die Audioanlage eines Kraftfahrzeuges
US7548854B2 (en) 2002-01-31 2009-06-16 Awi Licensing Company Architectural sound enhancement with pre-filtered masking sound
US7426804B2 (en) 2002-02-06 2008-09-23 Andersen Corporation Specialty display window
US6988339B2 (en) 2002-02-06 2006-01-24 Andersen Corporation Specialty media window
JP3886391B2 (ja) 2002-02-15 2007-02-28 シャープ株式会社 カード型装置、及び、それを備えた電子機器
US6983819B2 (en) 2002-04-02 2006-01-10 Awi Licensing Company Entertainment sound panels
EP1385354A1 (en) * 2002-07-25 2004-01-28 Kam, Tai-Yan Transparent panel-form loudspeaker
EP1480489A3 (en) * 2003-05-23 2009-07-01 Alps Electric Co., Ltd. Exciting device for producing sound
US20040240687A1 (en) * 2003-05-30 2004-12-02 Graetz Michael L. Flat panel speaker
JP4196096B2 (ja) * 2003-10-03 2008-12-17 パナソニック株式会社 スピーカモジュールおよびこれを用いた電子機器およびこのスピーカモジュールを用いた装置
JP4196097B2 (ja) 2003-10-06 2008-12-17 パナソニック株式会社 スピーカ、スピーカモジュールおよびこれを用いた電子機器
GB0400323D0 (en) * 2004-01-08 2004-02-11 New Transducers Ltd Loudspeakers
GB0405475D0 (en) 2004-03-11 2004-04-21 New Transducers Ltd Loudspeakers
DE102004032223A1 (de) * 2004-07-02 2006-01-19 Siemens Ag Audiovisuelle Anordnung
US8284955B2 (en) 2006-02-07 2012-10-09 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
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
JP4700323B2 (ja) * 2004-10-28 2011-06-15 ホシデン株式会社 フラットパネルスピーカ
JP4072542B2 (ja) * 2005-03-14 2008-04-09 Ｎｅｃアクセステクニカ株式会社 スピーカ一体型ディスプレイ
US8180065B2 (en) 2005-10-13 2012-05-15 Magna Mirrors Of America, Inc. Acoustical window assembly for vehicle
US8389120B2 (en) 2005-12-07 2013-03-05 Agc Glass Europe Sound-generating glazing
JP5057342B2 (ja) * 2005-12-07 2012-10-24 エージーシー グラス ユーロップ 音発生板ガラス
US10069471B2 (en) 2006-02-07 2018-09-04 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
US10848867B2 (en) 2006-02-07 2020-11-24 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
DE102006056394B4 (de) * 2006-11-29 2010-05-20 Siemens Ag Beleuchtungseinrichtung
GB2471474B (en) * 2009-06-30 2014-11-19 New Transducers Ltd Actuator
JP5527878B2 (ja) * 2009-07-30 2014-06-25 トムソン ライセンシング 表示装置及び音声出力装置
FR2955226B1 (fr) * 2010-01-08 2011-12-30 Commissariat Energie Atomique Dispositif de detection d'ondes acoustiques et systeme de localisation d'une source d'ondes acoustiques
US9066183B2 (en) 2010-04-15 2015-06-23 Panasonic Intellectual Property Management Co., Ltd. Piezoelectric speaker
JP2012105021A (ja) * 2010-11-09 2012-05-31 Sony Corp スピーカー装置
US8983098B2 (en) * 2012-08-14 2015-03-17 Turtle Beach Corporation Substantially planate parametric emitter and associated methods
US20150382110A9 (en) * 2013-03-14 2015-12-31 Lewis Athanas Acoustic Transducer and Method for Driving Same
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
US9615813B2 (en) 2014-04-16 2017-04-11 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
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9660596B2 (en) * 2015-01-23 2017-05-23 Tectonic Audio Labs Audio transducer stabilization system and method
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
CN104789473B (zh) * 2015-05-18 2018-02-09 宁波大学 一种用于微藻冻存的非渗透保护剂
US9621994B1 (en) 2015-11-16 2017-04-11 Bongiovi Acoustics Llc Surface acoustic transducer
US9906867B2 (en) 2015-11-16 2018-02-27 Bongiovi Acoustics Llc Surface acoustic transducer
WO2018123292A1 (ja) 2016-12-27 2018-07-05 ソニー株式会社 表示装置
CN108702573B (zh) 2016-12-27 2021-11-26 索尼公司 平板扬声器和显示装置
CN111183471B (zh) * 2017-10-04 2022-01-14 Ａｇｃ株式会社 显示器装置及电视装置
CN111492670B (zh) 2017-12-28 2022-06-03 索尼公司 显示设备
KR20200100637A (ko) 2017-12-28 2020-08-26 소니 주식회사 표시 장치 및 신호 생성 장치
CN108510436B (zh) * 2018-03-28 2020-09-15 清华大学 一种冷冻电镜三维重构中重构参数搜索方法和***
AU2019252524A1 (en) 2018-04-11 2020-11-05 Bongiovi Acoustics Llc Audio enhanced hearing protection system
WO2020028833A1 (en) 2018-08-02 2020-02-06 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
CN110913319B (zh) * 2018-09-18 2021-10-01 乐金显示有限公司 显示设备
EP3864860A1 (en) * 2018-10-13 2021-08-18 The University of Rochester Method, system and devices for selective modal control for vibrating structures
US10782731B1 (en) * 2019-02-28 2020-09-22 Google Llc Modal frequency shifting for loudspeaker devices
AT525365B1 (de) 2022-05-25 2023-03-15 Cale3D Prime Gmbh Elektroakustischer Wandler

Family Cites Families (5)

* 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
JPS6161598A (ja) * 1984-09-03 1986-03-29 Matsushita Electric Ind Co Ltd 音響装置
JP3034952B2 (ja) * 1990-08-04 2000-04-17 イギリス国 パネル形スピーカ
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій

Also Published As

Publication number Publication date
CN1287766A (zh) 2001-03-14
DE69921295T8 (de) 2006-07-06
DE69839134T2 (de) 2009-02-12
DE69921295D1 (de) 2004-11-25
KR100646191B1 (ko) 2006-11-17
JP2002510182A (ja) 2002-04-02
WO1999037121A1 (en) 1999-07-22
AR014430A1 (es) 2001-02-28
BG104543A (bg) 2001-01-31
AU2068199A (en) 1999-08-02
KR20010024874A (ko) 2001-03-26
TR200002108T2 (tr) 2000-11-21
JP4173283B2 (ja) 2008-10-29
TW432889B (en) 2001-05-01
PL341377A1 (en) 2001-04-09
EP1414266B1 (en) 2008-02-13
ATE280482T1 (de) 2004-11-15
HUP0102858A3 (en) 2003-03-28
CN1287766B (zh) 2010-06-23
EA200000781A1 (ru) 2000-12-25
YU36800A (sh) 2002-03-18
NO20003705L (no) 2000-09-20
EP1050190A1 (en) 2000-11-08
HUP0102858A2 (hu) 2001-12-28
BR9907145A (pt) 2000-10-24
DE69921295T2 (de) 2006-02-09
EP1414266A3 (en) 2006-08-16
DE69839134D1 (de) 2008-03-27
AU747693B2 (en) 2002-05-16
IL136820A0 (en) 2001-06-14
NZ504133A (en) 2002-03-28
HK1029247A1 (en) 2001-03-23
EP1414266A2 (en) 2004-04-28
SK10822000A3 (sk) 2000-12-11
NO20003705D0 (no) 2000-07-19
CA2318292A1 (en) 1999-07-22

Similar Documents

Publication Publication Date Title
EP1050190B1 (en) Active acoustic devices comprising panel members
US6522760B2 (en) Active acoustic devices
AU754818B2 (en) Resonant panel-form loudspeaker
US6332029B1 (en) Acoustic device
ES2140127T5 (es) Dispositivo acustico.
EP1800514B1 (en) Display device comprising a panel acoustic transducer, and transparent panel acoustic transducer
SK26698A3 (en) Display screens incorporating loudspeakers
EA000612B1 (ru) Доска объявлений с встроенными громкоговорителями
AU2002300608B2 (en) Active Acoustic Devices Comprising Panel Members
MXPA00007086A (en) Active acoustic devices comprising panel members
CZ20002588A3 (cs) Aktivní akustická zařízení obsahující panelové členy

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

AK Designated contracting states

Kind code of ref document: A1

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

AX Request for extension of the european patent

Free format text: RO PAYMENT 20000719;SI PAYMENT 20000719

17P Request for examination filed

Effective date: 20000719

17Q First examination report despatched

Effective date: 20010621

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

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 GB 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: 20041020

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: 20041020

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: 20041020

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: 20041020

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: 20041020

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: 20041020

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: NEW TRANSDUCERS LIMITED

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69921295

Country of ref document: DE

Date of ref document: 20041125

Kind code of ref document: P

NLT2 Nl: modifications (of names), taken from the european patent patent bulletin

Owner name: NEW TRANSDUCERS LIMITED

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: 20050117

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: 20050120

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: 20050120

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: 20050131

REG Reference to a national code

Ref country code: HK

Ref legal event code: GR

Ref document number: 1029247

Country of ref document: HK

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

ET Fr: translation filed
26N No opposition filed

Effective date: 20050721

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

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 NON-PAYMENT OF DUE FEES

Effective date: 20050320

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

Ref country code: FR

Payment date: 20120206

Year of fee payment: 14

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

Ref country code: NL

Payment date: 20120125

Year of fee payment: 14

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20130801

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20130930

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: 20130801

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

Ref country code: FR

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

Effective date: 20130131

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

Ref country code: DE

Payment date: 20140130

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69921295

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: 20150801

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

Ref country code: GB

Payment date: 20180129

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20190114

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

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20190114

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

Effective date: 20230520