EP0981928A2 - Pane-form loudspeakers - Google Patents

Pane-form loudspeakers

Info

Publication number
EP0981928A2
EP0981928A2 EP98921596A EP98921596A EP0981928A2 EP 0981928 A2 EP0981928 A2 EP 0981928A2 EP 98921596 A EP98921596 A EP 98921596A EP 98921596 A EP98921596 A EP 98921596A EP 0981928 A2 EP0981928 A2 EP 0981928A2
Authority
EP
European Patent Office
Prior art keywords
panel
smaller
larger
panels
driver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98921596A
Other languages
German (de)
French (fr)
Inventor
Henry Azima
Christien Ellis
Neil Harris
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 EP0981928A2 publication Critical patent/EP0981928A2/en
Withdrawn legal-status Critical Current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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • 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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the invention relates to panel-form loudspeakers, and more particularly, but not exclusively, to panel-form loudspeakers of the kind described in our International Application WO97/09842 and known as distributed mode loudspeakers. BACKGROUND ART
  • a distributed mode loudspeaker can cover the full audio range in a single panel. Since the current state of the art in materials technology precludes such a solution, our International Application WO/9709846 envisages small distributed mode loudspeaker panel suspended in a larger distributed mode loudspeaker panel of lower cut-off frequency to produce a wider acoustic bandwidth loudspeaker. This requires at least two exciters of appropriate type and also requires careful design of the mechanical interface between the two panels. As both panels cover a wide frequency range within their individual capabilities, there will also be a broad frequency range within which the outputs of the two panels may overlap. An electrical cross-over network may therefore be desirable, although it may tend to degrade the sound quality and will add to the manufacturing cost. An object of the invention is to provide arrangements which alleviate or overcome these difficulties.
  • the invention provides a panel-form loudspeaker comprising at least two resonant distributed mode acoustic panels wherein a single driver is provided to excite all of said panels such that bending wave energy is efficiently transferred to each of them to excite distributed mode resonance in them to provide acoustic output.
  • one of said panels may be larger than the other.
  • the larger of said panels preferably has a lower bending wave stiffness than the smaller.
  • the smaller of said panels is desirably positioned eccentrically with respect to the larger panel.
  • the driver is desirably positioned eccentrically with respect to the smaller of said panels.
  • a plurality of smaller panels are associated with a single larger panel.
  • a driver is mounted to the or each smaller panel which is attached to the larger panel, the attachment being such that bending wave energy from the or each driver and its associated smaller panel is efficiently transferred to the larger panel.
  • the smaller and larger panels are attached together face to face.
  • the panels may be secured together by means of an adhesive of low mechanical loss.
  • the or each smaller panel is formed within and attached to the larger panel, a driver being attached to the or each smaller panel.
  • the attachment of the smaller and larger panels may be effected with a material forming a controlling compliant coupling.
  • the or each smaller panel is mounted on one end of an associated coupler passing through and attached to the larger panel, a driver being attached to the or each said coupler.
  • the driver (s) is preferably attached to the other end of the or each coupler.
  • the attachment of the or each coupler to the larger panel desirably makes use of a material forming a controlling compliance coupling.
  • Figure 1 shows at A and B respectively rear face and side views of a first panel-form loudspeaker embodying the invention
  • Figure 2 is a sectional side view of a second panel- form loudspeaker embodying the invention
  • Figure 3 is a sectional side view of a third panel- form loudspeaker embodying the present invention.
  • Figure 4 is a rear face view of a modified form of the loudspeakers shown in Figure 1 to 3.
  • Figure 1 shows a smaller distributed mode loudspeaker panel (10) driven by an appropriate driver or exciter (12), preferably an electro-dynamic type for greater bandwidth.
  • the smaller panel (10) is attached face to face to a larger distributed mode loudspeaker panel (14) of appropriately lower stiffness and of dimensions appropriate to cover the required lower frequency range.
  • the smaller distributed mode loudspeaker panel (10) may be attached to the larger one by application of suitable adhesives of low mechanical loss in order to maintain efficient transfer of mechanical energy at low frequencies as well as maintaining good high frequency transmissibility with little loss.
  • Epoxy resin adhesives are suitable for this purpose.
  • the position of attachment of the smaller panel (10) to the larger panel (14) will be chosen in accordance with the distributed mode principle as explained in our International Application WO/97/09842, as will the position of attachment of the exciter (12) to the smaller panel (10) .
  • Figure 2 illustrates another type of panel-form loudspeaker embodying the invention in which a larger, low frequency optimised distributed mode panel (20) is modified by having a smaller, high frequency optimised panel (22) formed in the region of a driver (24) .
  • the common driving point of the driver (24) means that both parts or regions of the panel are excited.
  • the smaller, high frequency part or region of the panel is provided by extra stiffening of the local skin region (26) for example by adding bonded carbon fibre, glass fibre or similar high strength material. Alternatively, by adding new higher stiffness skin sections in that region.
  • a suitable compliant boundary (28) is incorporated to differentiate between the high and lower frequency parts of the panel. Control of the compliance frequency dependent damping of the resilient coupling allows the ideal or preferred cross-over point to be determined mechanically together with beneficial control of the damping at the boundary between the two parts of the panel.
  • Figure 3 illustrates yet another type of panel-form loudspeaker embodying the invention.
  • a smaller, high frequency, panel (30) is adhesively fixed to one end of a light weight tubular coupler (32) .
  • Coupler passes through a larger, low frequency panel (34) and is resiliently attached to it as shown at (36) .
  • the resilient attachment of the coupler to the larger panel (34) acts as a mechanical low pass filter to further define the balance of energy between the two panels (30 and 34) .
  • the end of the coupler (32) spaced from the high frequency panel (30) is fixed to a driver exciter (38) .
  • FIG. 4 Yet another arrangement embodying the invention is illustrated in Figure 4 where a single large resonant distributed mode acoustic panel (50) has associated with it a number of smaller panels (52) each having an associated driver (54) .
  • the smaller panels (52) may be associated with the larger panel (50) in the ways described with reference to Figures 1 to 3. That is to say the smaller panel (52) may be adhesively attached face to face to the larger panel (50) and have mounted thereon its own driver (54) .
  • the smaller panels (52) may comprise a number of sections of the larger panel (50) which have been appropriately stiffened and provided with an individual driver (54) - the stiffened sections (52) being coupled to the larger panel in the manner described with reference to Figure 2.
  • the smaller panels (52) may comprise panels carried by couplers each associated with an individual driver in the manner described with reference to Figure 3. It will be appreciated that the smaller panels (52) in the arrangement of Figure 4 need not all be associated with the larger panel (50) in the same was. Some may be associated in the way described with reference to Figure 1 whilst others are associated in the way described with reference to Figures 2 and/or 3.
  • the driver is in each case attached or coupled to a smaller panel, it will of course be appreciated that the driver may be attached or coupled to the larger of the panels if desired.
  • the distributed mode loudspeakers described have the benefits of enabling full audio bandwidth from one loudspeaker and reducing the number of drivers required and therefore the cost and complexity of the loudspeakers.
  • a loudspeaker in accordance with the present invention may be applied to an automobile headliner, with the benefit of a reduced component count, which results in higher reliability, no need for electrical cross-over components, and reduced manufacturing costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

A panel-form loudspeaker comprises at least two resonant distributed mode acoustic panels with a single driver provided to excite all the panels such that bending wave energy is efficiently transferred to each of them to excite distributed mode resonance in them to provide acoustic output. There may be two panels one larger than the other - the larger having a lower bending wave stiffness than the smaller. The smaller panel is positioned eccentrically of the larger and the driver eccentrically of the smaller panel. A plurality of smaller panels may be associated with a single larger panel. One embodiment provides a driver mounted to the or each smaller panel which is adhesively attached face to face to the larger panel. Another embodiment provides the or each smaller panel formed within and attached to the larger panel, a driver being attached to the or each smaller panel. The attachment of the panels uses a material forming a controlling compliant coupling. A third embodiment provides the or each smaller panel mounted on one end of an associated coupler passing through and attached to the larger panel, a driver being attached to the other end of the or each coupler. The attachment of the or each coupler to the larger panel uses a material forming a controlling compliance coupling. The or each coupler is tubular in section.

Description

TITLE: PANEL-FORM LOUDSPEAKERS
DESCRIPTION
FIELD OF THE INVENTION The invention relates to panel-form loudspeakers, and more particularly, but not exclusively, to panel-form loudspeakers of the kind described in our International Application WO97/09842 and known as distributed mode loudspeakers. BACKGROUND ART
In theory and given the availability of the right materials, a distributed mode loudspeaker can cover the full audio range in a single panel. Since the current state of the art in materials technology precludes such a solution, our International Application WO/9709846 envisages small distributed mode loudspeaker panel suspended in a larger distributed mode loudspeaker panel of lower cut-off frequency to produce a wider acoustic bandwidth loudspeaker. This requires at least two exciters of appropriate type and also requires careful design of the mechanical interface between the two panels. As both panels cover a wide frequency range within their individual capabilities, there will also be a broad frequency range within which the outputs of the two panels may overlap. An electrical cross-over network may therefore be desirable, although it may tend to degrade the sound quality and will add to the manufacturing cost. An object of the invention is to provide arrangements which alleviate or overcome these difficulties.
GENERAL ASPECTS OF THE INVENTION In one aspect the invention provides a panel-form loudspeaker comprising at least two resonant distributed mode acoustic panels wherein a single driver is provided to excite all of said panels such that bending wave energy is efficiently transferred to each of them to excite distributed mode resonance in them to provide acoustic output.
Desirably, there are two panels and one of said panels may be larger than the other.
The larger of said panels preferably has a lower bending wave stiffness than the smaller.
The smaller of said panels is desirably positioned eccentrically with respect to the larger panel.
The driver is desirably positioned eccentrically with respect to the smaller of said panels.
In one embodiment a plurality of smaller panels are associated with a single larger panel.
Advantageously, a driver is mounted to the or each smaller panel which is attached to the larger panel, the attachment being such that bending wave energy from the or each driver and its associated smaller panel is efficiently transferred to the larger panel.
Preferably the smaller and larger panels are attached together face to face. The panels may be secured together by means of an adhesive of low mechanical loss. In another embodiment the or each smaller panel is formed within and attached to the larger panel, a driver being attached to the or each smaller panel. The attachment of the smaller and larger panels may be effected with a material forming a controlling compliant coupling.
In yet another embodiment the or each smaller panel is mounted on one end of an associated coupler passing through and attached to the larger panel, a driver being attached to the or each said coupler.
The driver (s) is preferably attached to the other end of the or each coupler.
The attachment of the or each coupler to the larger panel desirably makes use of a material forming a controlling compliance coupling.
The or each coupler is preferably tubular in section. BRIEF DESCRIPTION OF THE DRAWINGS The above aspects, features and advantages of the invention will become apparent from the following description of embodiments of the invention now made with reference to the accompanying drawings, in which:-
Figure 1 shows at A and B respectively rear face and side views of a first panel-form loudspeaker embodying the invention,
Figure 2 is a sectional side view of a second panel- form loudspeaker embodying the invention,
Figure 3 is a sectional side view of a third panel- form loudspeaker embodying the present invention, and
Figure 4 is a rear face view of a modified form of the loudspeakers shown in Figure 1 to 3. BEST MODES FOR CARRYING OUT THE INVENTION
Figure 1 shows a smaller distributed mode loudspeaker panel (10) driven by an appropriate driver or exciter (12), preferably an electro-dynamic type for greater bandwidth. The smaller panel (10) is attached face to face to a larger distributed mode loudspeaker panel (14) of appropriately lower stiffness and of dimensions appropriate to cover the required lower frequency range. By the choice of the right materials and driver design it can be shown that when the smaller panel (10) is driven it will continue to produce its useful bandwidth superimposed on the lower range frequency output resulting from the larger panel (14) giving a much wider bandwidth. The smaller distributed mode loudspeaker panel (10) may be attached to the larger one by application of suitable adhesives of low mechanical loss in order to maintain efficient transfer of mechanical energy at low frequencies as well as maintaining good high frequency transmissibility with little loss. Epoxy resin adhesives are suitable for this purpose. The position of attachment of the smaller panel (10) to the larger panel (14) will be chosen in accordance with the distributed mode principle as explained in our International Application WO/97/09842, as will the position of attachment of the exciter (12) to the smaller panel (10) .
Figure 2 illustrates another type of panel-form loudspeaker embodying the invention in which a larger, low frequency optimised distributed mode panel (20) is modified by having a smaller, high frequency optimised panel (22) formed in the region of a driver (24) . The common driving point of the driver (24) means that both parts or regions of the panel are excited. The smaller, high frequency part or region of the panel is provided by extra stiffening of the local skin region (26) for example by adding bonded carbon fibre, glass fibre or similar high strength material. Alternatively, by adding new higher stiffness skin sections in that region. Depending upon the wave propagation properties of the larger panel (20) a natural balance of power division with frequency may be obtained. Additionally a suitable compliant boundary (28) is incorporated to differentiate between the high and lower frequency parts of the panel. Control of the compliance frequency dependent damping of the resilient coupling allows the ideal or preferred cross-over point to be determined mechanically together with beneficial control of the damping at the boundary between the two parts of the panel.
Figure 3 illustrates yet another type of panel-form loudspeaker embodying the invention. In the arrangement of Figure 3 a smaller, high frequency, panel (30) is adhesively fixed to one end of a light weight tubular coupler (32) . Coupler passes through a larger, low frequency panel (34) and is resiliently attached to it as shown at (36) . The resilient attachment of the coupler to the larger panel (34) acts as a mechanical low pass filter to further define the balance of energy between the two panels (30 and 34) . It can be seen that the end of the coupler (32) spaced from the high frequency panel (30) is fixed to a driver exciter (38) . Yet another arrangement embodying the invention is illustrated in Figure 4 where a single large resonant distributed mode acoustic panel (50) has associated with it a number of smaller panels (52) each having an associated driver (54) . The smaller panels (52) may be associated with the larger panel (50) in the ways described with reference to Figures 1 to 3. That is to say the smaller panel (52) may be adhesively attached face to face to the larger panel (50) and have mounted thereon its own driver (54) . Alternatively, the smaller panels (52) may comprise a number of sections of the larger panel (50) which have been appropriately stiffened and provided with an individual driver (54) - the stiffened sections (52) being coupled to the larger panel in the manner described with reference to Figure 2. Lastly, the smaller panels (52) may comprise panels carried by couplers each associated with an individual driver in the manner described with reference to Figure 3. It will be appreciated that the smaller panels (52) in the arrangement of Figure 4 need not all be associated with the larger panel (50) in the same was. Some may be associated in the way described with reference to Figure 1 whilst others are associated in the way described with reference to Figures 2 and/or 3.
In the described embodiments the driver is in each case attached or coupled to a smaller panel, it will of course be appreciated that the driver may be attached or coupled to the larger of the panels if desired. INDUSTRIAL APPLICABILITY
The distributed mode loudspeakers described have the benefits of enabling full audio bandwidth from one loudspeaker and reducing the number of drivers required and therefore the cost and complexity of the loudspeakers.
A loudspeaker in accordance with the present invention may be applied to an automobile headliner, with the benefit of a reduced component count, which results in higher reliability, no need for electrical cross-over components, and reduced manufacturing costs.

Claims

1. A panel-form loudspeaker comprising at least two resonant distributed mode acoustic panels characterised in that a single driver is provided to excite all of said panels such that bending wave energy is efficiently transferred to each of them to excite distributed mode resonance in them to provide acoustic output.
2. A panel-form loudspeaker according to Claim 1, wherein there are two panels and one of said panels is larger than the other.
3. A panel-form loudspeaker according to Claim 2 , wherein the larger of said panels has a lower bending wave stiffness than the smaller.
4. A panel-form loudspeaker according to Claim 2 or Claim 3, wherein the smaller of said panels is positioned eccentrically with respect to the larger panel.
5. A panel-form loud speaker as claimed in any one of claims 2 to 4, wherein said driver is positioned eccentrically with respect to the smaller of said panels.
6. A panel-form loudspeaker as claimed in any one of claims 2 to 5, wherein a plurality of smaller panels are associated with a single larger panel.
7. A panel-form loudspeaker as claimed in any one of claims 2 to 6, wherein a driver is mounted to the or each smaller panel which is attached to the larger panel, the attachment being such that bending wave energy from the or each driver and its associated smaller panel is efficiently transferred to the larger panel.
8. A panel-form loudspeaker as claimed in Claim 7, wherein the or each smaller panel is attached to the larger panel face to face.
9. A panel-form loudspeaker as claimed in Claim 7 or Claim 8, wherein the panels are secured together by means of an adhesive of low mechanical loss.
10. A panel-form loudspeaker as claimed in any one of claims 2 to 6, wherein the or each smaller panel is formed within and attached to the larger panel, a driver being attached to the or each smaller panel.
11. A panel-form loudspeaker as claimed in Claim 10, wherein the attachment of the smaller and larger panels is effected with a material forming a controlling compliant coupling.
12. A panel-form loudspeaker as claimed in any one of claims 2 to 6, wherein the or each smaller panel is mounted on one end of an associated coupler passing through and attached to the larger panel, a driver being attached to the or each said coupler.
13. A panel form loudspeaker as claimed in Claim 12, wherein the driver (s) is attached to the other end of the or each coupler.
14. A panel-form loudspeaker as claimed in Claim 12 or Claim 13, wherein the attachment of the or each coupler to the larger panel makes use of a material forming a controlling compliance coupling.
15. A panel-form loudspeaker as claimed in any one of claims 12 to 14, wherein the or each coupler is tubular in section.
EP98921596A 1997-05-15 1998-05-13 Pane-form loudspeakers Withdrawn EP0981928A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9709959.2A GB9709959D0 (en) 1997-05-15 1997-05-15 Panel-form loudspeakers
GB9709959 1997-05-15
PCT/GB1998/001362 WO1998052381A2 (en) 1997-05-15 1998-05-13 Panel-form loudspeakers

Publications (1)

Publication Number Publication Date
EP0981928A2 true EP0981928A2 (en) 2000-03-01

Family

ID=10812418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98921596A Withdrawn EP0981928A2 (en) 1997-05-15 1998-05-13 Pane-form loudspeakers

Country Status (15)

Country Link
EP (1) EP0981928A2 (en)
JP (1) JP2002505814A (en)
KR (1) KR20010012527A (en)
CN (1) CN1255277A (en)
AR (1) AR012696A1 (en)
AU (1) AU746673B2 (en)
BR (1) BR9809642A (en)
CA (1) CA2290476A1 (en)
CO (1) CO4780081A1 (en)
GB (1) GB9709959D0 (en)
ID (1) ID20339A (en)
IL (1) IL132686A0 (en)
TW (1) TW444510B (en)
WO (1) WO1998052381A2 (en)
ZA (1) ZA983986B (en)

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0969691B1 (en) * 1998-01-16 2012-06-13 Sony Corporation Speaker and electronic apparatus using speaker
ATE303051T1 (en) 1998-06-22 2005-09-15 Slab Technology Ltd SPEAKER
GB9826164D0 (en) * 1998-11-30 1999-01-20 New Transducers Ltd Acoustic devices
GB9901895D0 (en) * 1999-01-29 1999-03-17 New Transducers Ltd Loudspeakers
US6676879B1 (en) 1999-01-29 2004-01-13 New Transducers Limited Method of making vehicle interior trim panel with integral loudspeaker
GB9905373D0 (en) * 1999-03-10 1999-05-05 New Transducers Ltd Inertial vibration exciters
GB9915361D0 (en) * 1999-07-02 1999-09-01 New Transducers Ltd Acoustic device
GB0007025D0 (en) * 2000-03-23 2000-05-10 New Transducers Ltd Loudspeakers
US7372968B2 (en) 2000-11-08 2008-05-13 New Transducers Limited Loudspeaker driver
GB0102865D0 (en) 2001-02-06 2001-03-21 Secr Defence Brit Panel form loudspeaker
CN1500364A (en) * 2001-04-05 2004-05-26 新型转换器有限公司 Loudspeaker
US7245729B2 (en) 2001-04-05 2007-07-17 New Transducers Limited Loudspeaker
US7548854B2 (en) 2002-01-31 2009-06-16 Awi Licensing Company Architectural sound enhancement with pre-filtered masking sound
GB2386026B (en) * 2002-02-28 2005-06-08 1 Ltd Loudspeaker
US6983819B2 (en) 2002-04-02 2006-01-10 Awi Licensing Company Entertainment sound panels
EP1480489A3 (en) 2003-05-23 2009-07-01 Alps Electric Co., Ltd. Exciting device for producing sound
GB0405475D0 (en) * 2004-03-11 2004-04-21 New Transducers Ltd Loudspeakers
US10158337B2 (en) 2004-08-10 2018-12-18 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
US11431312B2 (en) 2004-08-10 2022-08-30 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
JP2006121325A (en) * 2004-10-20 2006-05-11 Authentic Ltd Panel-type speaker
JP2007116422A (en) 2005-10-20 2007-05-10 Sony Corp Audio output device and method
US8204266B2 (en) 2005-10-21 2012-06-19 Sfx Technologies Limited Audio devices
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
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
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
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
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
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
US10639000B2 (en) 2014-04-16 2020-05-05 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
GB2539029B (en) * 2015-06-04 2017-06-07 Amina Tech Ltd Distributed mode loudspeaker damping oscillations within exciter feet
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
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
KR102252696B1 (en) 2019-10-21 2021-05-17 삼원액트 주식회사 Panel with sound reproduction
KR102215716B1 (en) 2019-10-21 2021-02-18 삼원액트 주식회사 Panel with sound reproduction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS588000A (en) * 1981-07-06 1983-01-17 Murata Mfg Co Ltd Piezoelectric speaker
US4751419A (en) * 1986-12-10 1988-06-14 Nitto Incorporated Piezoelectric oscillation assembly including several individual piezoelectric oscillation devices having a common oscillation plate member
WO1992003024A1 (en) * 1990-08-04 1992-02-20 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Panel-form loudspeaker
JPH11512257A (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 Panel loudspeaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9852381A2 *

Also Published As

Publication number Publication date
BR9809642A (en) 2000-07-11
GB9709959D0 (en) 1997-07-09
WO1998052381A3 (en) 1999-02-18
AU746673B2 (en) 2002-05-02
IL132686A0 (en) 2001-03-19
TW444510B (en) 2001-07-01
ID20339A (en) 1998-11-26
KR20010012527A (en) 2001-02-15
JP2002505814A (en) 2002-02-19
CA2290476A1 (en) 1998-11-19
ZA983986B (en) 1999-02-19
AR012696A1 (en) 2000-11-08
CN1255277A (en) 2000-05-31
AU7439098A (en) 1998-12-08
WO1998052381A2 (en) 1998-11-19
CO4780081A1 (en) 1999-05-26

Similar Documents

Publication Publication Date Title
AU746673B2 (en) Panel-form loudspeakers
EP0988775B1 (en) Vibration transducers for resonant panel-form loudspeaker and loudspeaker with the same
KR100443204B1 (en) Inertial vibration transducer
JPH11512257A (en) Panel loudspeaker
JPH11512262A (en) Inertial vibration transducer
JPH11512254A (en) Panel microphone
JPH11512246A (en) Loudspeaker with panel-type acoustic radiating element
EP1084591A1 (en) Resonant panel-form acoustic devices
JPH11513210A (en) Passenger vehicle with built-in loudspeaker composed of panel-shaped acoustic radiating elements
EP0847672B1 (en) Packaging
JP2000138994A (en) Panel type speaker
CZ57498A3 (en) Inertial vibration converter
US20050185809A1 (en) Audio frequency speaker
US6494289B1 (en) Device for dynamic excitation of panel loudspeakers
CN110896267B (en) Vibration exciter for electronic product and electronic product
EA000929B1 (en) Pannel-form loudspeakers
CN1327358A (en) Loudspeaker device
MXPA99010500A (en) Panel-form loudspeakers
CN109348376B (en) Preparation method of voice coil auxiliary supporting part, voice coil auxiliary supporting part and sound generating device monomer
JPH09224299A (en) Piezoelectric speaker
CN1301128A (en) Full-band loudspeaker
RU99127301A (en) PANEL TYPE SPEAKERS
JPS60233999A (en) Piezoelectric speaker
MXPA01002034A (en) Loudspeakers comprising a resonant panel-form member

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: 19991130

AK Designated contracting states

Kind code of ref document: A2

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

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

Owner name: NEW TRANSDUCERS LIMITED

17Q First examination report despatched

Effective date: 20010713

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20021203

REG Reference to a national code

Ref country code: HK

Ref legal event code: WD

Ref document number: 1023681

Country of ref document: HK