JP2002508897A - Acoustic body - Google Patents

Acoustic body

Info

Publication number
JP2002508897A
JP2002508897A JP55008998A JP55008998A JP2002508897A JP 2002508897 A JP2002508897 A JP 2002508897A JP 55008998 A JP55008998 A JP 55008998A JP 55008998 A JP55008998 A JP 55008998A JP 2002508897 A JP2002508897 A JP 2002508897A
Authority
JP
Japan
Prior art keywords
panel
acoustic device
device according
acoustic
loudspeaker
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.)
Pending
Application number
JP55008998A
Other languages
Japanese (ja)
Inventor
ヘンリー アジマ
マーティン コロムス
グレイアム バンク
Original Assignee
ニュー トランスデューサーズ リミテッド
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 to GB9709969.1 priority Critical
Priority to GBGB9709969.1A priority patent/GB9709969D0/en
Application filed by ニュー トランスデューサーズ リミテッド filed Critical ニュー トランスデューサーズ リミテッド
Priority to PCT/GB1998/001374 priority patent/WO1998053638A2/en
Publication of JP2002508897A publication Critical patent/JP2002508897A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/045Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Abstract

(57) Abstract: A resonant panel-shaped member having a vibration exciter for applying a bending wave energy to cause resonance to generate an acoustic output, wherein the panel-shaped loudspeaker is disposed close to and substantially independent of An acoustic device comprising an array of loudspeakers, characterized by having a common excitation device for producing a perfect acoustic output and an overall acoustic output as if it were a substantially single sound source.

Description

DETAILED DESCRIPTION OF THE INVENTION                                  Acoustic body Technical field   The invention relates to a device having an acoustic body or loudspeaker arrangement. Preferably , But without limitation, international application WO 97/09842 filed by the applicant. And a panel-shaped loudspeaker as described in US Pat. Background art   Conventional piston-type loudspeakers that reproduce the same signal for the purpose of sound enhancement It is known to provide them in rows. The disadvantage of such an arrangement is that Due to the coherent phase of the mosquitoes, interference occurs between the acoustic outputs of each speaker in the train, Causing a harmful lobe effect.   Applicant has in international application WO 97/09842 act as a projection screen. Large center panel speakers and small left and right panel loudspeakers It is proposed to provide a multi-channel distributed mode loudspeaker arrangement with . In such a three-channel system, each channel typically has a different signal, one This is to reproduce the left and right stereo signals and the center signal. Ming especially shows that the reproduced sound does not have three sound source characteristics but rather one sound source characteristic. Surprising consequences of adding a normal signal to such a speaker arrangement Can be said to be something. Disclosure of the invention   According to the present invention, substantially independent of phase and substantially as a single acoustic source Loudspeaking so that a common drive is possible to produce effective sound output Loudspeaker arrangement characterized in that the speakers have a panel shape arranged in close proximity An acoustic device with a row is provided. Such an array is composed of multiple For each sound output of the loudspeakers, at least mainly structurally additional And, in effect, harmful to some extent or significant extent. It will not be negotiated.   These loudspeakers have a mechanical coupling between the edge vibrations of adjacent panels. So that, for example, if these edges are not mm or less, and is often frequency dependent, and For example, at least in the embodiments described herein, Not usually larger than the law, affected by the provision of inert baffle means, Proper proximity so that leakage between adjacent panels is acceptable It is. The overall requirement is that virtually all arrays behave as a single source. It is.   Loudspeakers can be of the same size and shape, or they can be Of the same size, or of the same or different shape, of the same or different size For example, if an effective “tile” arrangement is desired, It may be configured as follows. That is, the array may be of any shape, Preferably, it may have one or more rows of four or more loudspeakers. Each pa The flannel-shaped loudspeakers may be interconnected between their adjacent edges. Between panels May include hinges.   Flexible members are arranged to overlap the edges of each panel and interconnect between the panels May be attached to the edge. The flexible member overlaps the surface of each panel and A sheet may be formed by forming a plate and forming a hinge. Flexible members The circuit board may be printed with an electrical circuit, so that each panel is electrically connected . A pair of electrical terminals on the board are electrically connected to each vibration exciter of the loudspeaker. Is also good.   Frame means for connecting the edges of each panel may be provided. Frame means May include an acoustic baffle.   Each panel is preferably a resonant distributed mode loudspeaker and each loudspeaker is The speaker is located in at least one working area, which extends transversely to the thickness. And has the ability to maintain and propagate input vibrational energy by bending waves. And the resonance mode vibration component is distributed over one operating region, A member having a preferred predetermined location or location within the working area, A vibration exciter is mounted on the member at one of the positions or locations to Causes resonance to form an acoustic radiator that vibrates and gives acoustic output through resonance It is rubbing.   A distributed mode loudspeaker panel arrangement that reproduces the same acoustic signal A synthesis that is very close to the sum of the power responses of cloth mode loudspeakers It can be seen that the generated acoustic interrogation is generated. Sound from distributed mode loudspeakers Due to the diffusive nature of the radiation, such arrays do not show harmful interference.   When a “tile” array is formed, the distributed mode loudspeaker panel looks like a wall It can be used on a flexible substrate and mounted on a thin flexible carrier. And can be carried for professional or similar uses.   Acoustically permeable woven fabric or other material as known by the trade name "Mehnex" A thin, lightweight thermoplastic sheet material connects each panel in a “tile” arrangement. Subsequently, it can be used to form a flexible connection between the panels.   The distributed mode loudspeaker arrangement is based on the high energy dissipation of multiple exciters Enhanced power handling becomes possible. This array is distributed mode louds Can also be used to increase the maximum sound pressure level obtained with a peaker system .   Since the loudspeaker array has flexibility at the panel boundary, it has various structures. Physically conform to the shape and contour of Can be.   For some applications, such as home cinema screens, storage and / or transport Panels can be arranged so that the acoustic body can be wound into a convenient size for transport. Rows can save space.   Directivity adjustment by selecting distribution mode loudspeakers with various external specifications Is possible. Alternatively or additionally, the directivity of the sound output of the system can be shaped. Selectively apply an electrical delay of the applied signal to each panel to create and adjust Is also good. In addition, the array distribution itself is used to adjust acoustic distribution and directivity it can.   In addition, the adjustment of the radiation pattern is given by the zigzag folding arrangement of the panel You. This selects the unfolding angle and the resulting interior angle between the folds This allows the deployed speaker system to be tailored to the application and required acoustic characteristics. The physical size of the system can be finely adjusted.   Other invariants that determine acoustic performance include the distribution of the panels in the array, e.g., geometric, Equations involving semi-random relationships related to and position, further enhancing the diffusion performance of the array including.   Flexible thermoplastic sheet material or film is "tiled" or lined Specific relationships used to facilitate electrical connections between each panel For this purpose, conductive tracks may be printed on the film. This is a "tile" array The advantage is that the electrical wiring is orderly and reliable. In addition, this set connection pattern Parameters are three parameters: responsiveness, load impedance, and power harness. Make your steering ability finely adjustable in steps.   In another form, the panel arrangement is suitably hinged so that each supports the panel. It can be realized as a frame of a combined plastic or the like. This is acceptable Placing “tiles” on flexible sheets is a more costly approach. But may be more suitable for certain applications. The advantage is that large mass Ultra-low performance and sound quality by the assembly, and also provide a beneficial acoustic baffle effect The possibility of a strong molding. BRIEF DESCRIPTION OF THE FIGURES The invention is schematically illustrated by way of example in the accompanying drawings. FIGS. 1 and 1a show the front of a panel-shaped loudspeaker arrangement according to the invention, respectively. FIG. 2 shows a front view and a side view. FIG. 2 is a side view similar to FIG. 1a of an array having an arcuate contour. FIG. 3 is a side view similar to FIG. 2 of an arrangement forming a zigzag contour. FIG. 4 shows a typical parallel / series printer that combines and excites the exciters of each panel of the array. FIG. 9 is a rear view of the circuit track pattern. BEST MODE FOR CARRYING OUT THE INVENTION   In the drawing, almost identical panel-shaped loudspeakers mounted in multiple rows on the substrate (5) are shown. An acoustic body (1) in the form of an arrangement (2) consisting of a car (3) is shown. This implementation Panel-shaped loudspeakers of the form are described in international application WO 97/09842 Such a resonant panel loudspeaker. That is, each loudspeaker (3) Applies bending wave energy to the panel that causes resonance and generates acoustic output Panel equipped with a vibration exciter (6), such as an inertial electrodynamic device (4).   The substrate is, for example, a plastic fixed to one side of each panel with an adhesive, for example. A flexible sheet of film, which allows each panel to be 5 in a rectangular array Are held in close proximity to each other so that they are aligned in six rows. This arrangement , A thin elongated portion of the substrate is defined between adjacent panels, the elongated portion being A hinge (7) is formed, whereby the arrangement is arranged in a plane as shown in FIG. Can be placed or folded for storage, or the arc shown in FIG. Shape can be formed. Also, as shown in FIG. 3, the arrangement is zigzag They can also be placed.   As shown in FIG. 4, the other surface of the substrate is electrically conductive, for example by printing. Tracks (8 and 13) and intermediate tracks arranged in series / parallel And a parallel connection to each terminal (not shown) of the vibration exciter (6). Represented along columns associated with a pair of positive and negative electrodes (9, 10), The series includes a pair of positive terminals connected to respective terminals (not shown) of the vibration exciter (6). And across the row, with negative and negative electrodes (9,10). The shaker is excited in a suitable manner, and the conductive tracks (8, 13) are connected to each input terminal. (11, 12).   Embodiments of the present invention use a flexible substrate that forms the basis of a loudspeaker panel array. Although described in connection with a rectangular loudspeaker array having It will be appreciated that loudspeaker panels can be combined. sand That is, each panel is arranged to join one to the other and is independently mounted on the frame. And / or two or more panels may share a common frame. It may be mounted on a system. The frames may be interconnected by hinges. Ma The loudspeaker panel may be rigid or semi-rigid in or on the substrate. Alternatively, the board may be mounted with desired compliance, and the board may form a baffle Is also good. However, it is not hindered by certain physical interconnections, in other words, In any case, two or more panels, including an arrangement that facilitates the desired effect All operatively effective proximity couplings of the loudspeaker is there. The sub-array of adjacent loudspeaker units of FIG. Can be replaced with different size panels like knits, different shapes, Oval, oblong, etc., and combined for all desired array shapes Included. Industrial applicability   The present invention, as shown in the drawings, provides and facilitates: 1. Enhanced power handling for high power applications, 2. Depending on the selected offset of the mode distribution for each panel, the distribution mode louds Alternating the peaker frequency distribution, 3. Different distribution modes The choice of loudspeaker panel orientation allows for off-axis To control the uniformity well, 4. Whether simple or complex, the overall form of the panel arrangement, for example, Controlling the directivity by bending, 5. Digital for directivity control by differential delay control for each panel of the array Using signal processing, 6. Winding both parts of the device, the 'tile' arrangement and the screen, Panel layout and video or images are physically projected to facilitate portability. Use in projection applications by separating from the optically reflective surface to be shadowed; and And 7. Introduction of electrical delays and / or analog or digital methods Adjusting the overall acoustic response by transmitting a function.   The acoustic body of the present invention finds application to passenger cars such as automobile headliners. There will be.   That is, the present invention provides a simple and improved loudspeaker arrangement. You.

────────────────────────────────────────────────── ─── Continuation of front page    (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, I T, LU, MC, NL, PT, SE), OA (BF, BJ , CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, L S, MW, SD, SZ, UG, ZW), EA (AM, AZ , BY, KG, KZ, MD, RU, TJ, TM), AL , AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, E E, ES, FI, GB, GE, GH, GM, GW, HU , ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, M D, MG, MK, MN, MW, MX, NO, NZ, PL , PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, U Z, VN, YU, ZW (72) Inventor Bank Graham             United Kingdom Cambridgeshire PEE             18 6G Huntingdon Boat             Perry Way 1

Claims (1)

  1. [Claims] 1. An acoustic device comprising an array of loudspeakers, wherein bending acoustic energy is applied.   Panel shape with vibration exciter to generate acoustic output by causing resonance   The panel-shaped loudspeaker comprises a member,   Qualitatively unrelated sound output and comprehensive sound output as if it were virtually a single sound source   An acoustic device comprising a common excitation device for generating force. 2. The loudspeaker according to claim 1, wherein the panel-shaped loudspeakers are all the same size.   Sound equipment. 3. The panel-shaped loudspeakers are interconnected between their adjacent edges.   The acoustic device according to claim 1, wherein the acoustic device is provided. 4. The interconnection between the panels includes a hinge.   4. The acoustic device according to 3. 5. The method according to claim 1, further comprising a substrate on which the loudspeaker array is mounted.   The acoustic device according to claim 1. 6. At least an edge of each panel to form the interconnect between the panels;   A flexible member arranged to be superposed and attached thereto.   6. The acoustic device according to any one of 4 to 5. 7. 5. The method according to claim 4, wherein the flexible member also forms a hinge.   The sound device according to claim 6, wherein 8. 8. The method according to claim 5, wherein the flexible member forms a substrate.   A sound device according to any one of the above. 9. A pair to which the vibration exciters on each loudspeaker in the array are electrically connected   The acoustic device according to any one of the preceding claims, characterized by the following input terminals. Ten. The audio device according to claim 9, wherein the input terminal is on the substrate.   Place. 11. The flexible member has at least one of the vibration exciters bS that can be electrically excited.   11. The electric circuit according to claim 6, wherein the electric circuit is printed.   An acoustic device as described. 12. The flexible members are arranged to overlap the surface of each panel in the array.   The acoustic device according to any one of claims 6 to 11, wherein the acoustic device is a portable device. 13. Claims characterized by frame means connecting the edges of the panel together.   An acoustic device according to any one of the preceding claims. 14. 14. The apparatus according to claim 13, wherein said frame means comprises an acoustic baffle.   On-board acoustic device. 15. Wherein each panel is a resonance distribution mode loudspeaker.   An acoustic device according to any one of the preceding claims. 16. The arrangement is characterized in that it comprises one or more rows of the panel-shaped loudspeakers.   An acoustic device according to any one of the preceding claims, characterized in that
JP55008998A 1997-05-17 1998-05-14 Acoustic body Pending JP2002508897A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9709969.1 1997-05-17
GBGB9709969.1A GB9709969D0 (en) 1997-05-17 1997-05-17 An acoustic object
PCT/GB1998/001374 WO1998053638A2 (en) 1997-05-17 1998-05-14 Acoustic apparatus comprising an array of loudspeakers

Publications (1)

Publication Number Publication Date
JP2002508897A true JP2002508897A (en) 2002-03-19

Family

ID=10812428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55008998A Pending JP2002508897A (en) 1997-05-17 1998-05-14 Acoustic body

Country Status (13)

Country Link
EP (1) EP0981927A2 (en)
JP (1) JP2002508897A (en)
KR (1) KR20010012592A (en)
CN (1) CN1256065A (en)
AR (1) AR012706A1 (en)
AU (1) AU736000B2 (en)
BR (1) BR9808814A (en)
CA (1) CA2290466A1 (en)
GB (1) GB9709969D0 (en)
IL (1) IL132685D0 (en)
TW (1) TW391146B (en)
WO (1) WO1998053638A2 (en)
ZA (1) ZA9803988B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006339996A (en) * 2005-06-01 2006-12-14 Kenwood Corp Screen speaker system and manufacturing method therefor
JP2007053609A (en) * 2005-08-18 2007-03-01 Sony Corp Flat panel speaker
JP2007053610A (en) * 2005-08-18 2007-03-01 Sony Corp Flat panel speaker
JP2008227802A (en) * 2007-03-12 2008-09-25 Yamaha Corp Array speaker and speaker system
JP2012191314A (en) * 2011-03-09 2012-10-04 Yamaha Corp Speaker system
JP2013003422A (en) * 2011-06-20 2013-01-07 Yamaha Corp Acoustic system

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9914507D0 (en) * 1999-06-23 1999-08-25 New Transducers Ltd Acoustic device
DE10001410C2 (en) * 2000-01-14 2001-12-06 Harman Audio Electronic Sys Flat speaker arrangement
GB0009133D0 (en) * 2000-04-14 2000-05-31 New Transducers Ltd Acoustic device and method for driving it
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker
DE10345645B4 (en) * 2003-10-01 2006-05-18 Elac Electroacustic Gmbh Speaker layout
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
CN101142845B (en) * 2005-03-08 2011-05-25 Nxp股份有限公司 Loudspeaker enclosure with a closed and an open position
US8284955B2 (en) 2006-02-07 2012-10-09 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
DE102007003165A1 (en) * 2007-01-22 2008-07-24 Siemens Ag Area loudspeaker and method for adjusting the vibration behavior of a vibration system
GB2451259B (en) 2007-07-25 2011-07-20 Gp Acoustics Loudspeaker
US7856115B2 (en) 2007-11-30 2010-12-21 Clair Brothers Audio Systems Inc. Optimized moving-coil loudspeaker
GB2491366A (en) * 2011-05-31 2012-12-05 Nokia Corp A configurable microphone or loudspeaker apparatus
US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth 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
US9906858B2 (en) 2013-10-22 2018-02-27 Bongiovi Acoustics Llc System and method for digital signal processing
US20150289037A1 (en) * 2014-04-07 2015-10-08 Bose Corporation Curvable line array
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
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
US9525943B2 (en) 2014-11-24 2016-12-20 Apple Inc. Mechanically actuated panel acoustic system
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
US9906867B2 (en) 2015-11-16 2018-02-27 Bongiovi Acoustics Llc Surface acoustic transducer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768991A (en) * 1980-10-16 1982-04-27 Pioneer Electronic Corp Speaker system
JPH0541897A (en) * 1991-08-07 1993-02-19 Pioneer Electron Corp Speaker equipment and directivity control method
JPH0662488A (en) * 1992-08-11 1994-03-04 Pioneer Electron Corp Speaker equipment
JPH11512245A (en) * 1995-09-02 1999-10-19 ニュー トランスデューサーズ リミテッド Display screen incorporating loudspeakers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006339996A (en) * 2005-06-01 2006-12-14 Kenwood Corp Screen speaker system and manufacturing method therefor
JP2007053609A (en) * 2005-08-18 2007-03-01 Sony Corp Flat panel speaker
JP2007053610A (en) * 2005-08-18 2007-03-01 Sony Corp Flat panel speaker
JP4609715B2 (en) * 2005-08-18 2011-01-12 ソニー株式会社 Flat panel speaker
JP2008227802A (en) * 2007-03-12 2008-09-25 Yamaha Corp Array speaker and speaker system
JP2012191314A (en) * 2011-03-09 2012-10-04 Yamaha Corp Speaker system
JP2013003422A (en) * 2011-06-20 2013-01-07 Yamaha Corp Acoustic system

Also Published As

Publication number Publication date
AR012706A1 (en) 2000-11-08
WO1998053638A3 (en) 1999-03-11
BR9808814A (en) 2000-07-18
KR20010012592A (en) 2001-02-15
AU736000B2 (en) 2001-07-26
AU7439698A (en) 1998-12-11
WO1998053638A2 (en) 1998-11-26
EP0981927A2 (en) 2000-03-01
ZA9803988B (en) 1999-01-25
CA2290466A1 (en) 1998-11-26
IL132685D0 (en) 2001-03-19
TW391146B (en) 2000-05-21
CN1256065A (en) 2000-06-07
GB9709969D0 (en) 1997-07-09

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