WO2000033613A2 - Resonant bending wave panel-form loudspeaker - Google Patents
Resonant bending wave panel-form loudspeaker Download PDFInfo
- Publication number
- WO2000033613A2 WO2000033613A2 PCT/GB1999/003990 GB9903990W WO0033613A2 WO 2000033613 A2 WO2000033613 A2 WO 2000033613A2 GB 9903990 W GB9903990 W GB 9903990W WO 0033613 A2 WO0033613 A2 WO 0033613A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- panel
- loudspeaker
- wall
- frame
- bending wave
- Prior art date
Links
- 238000005452 bending Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000005520 electrodynamics Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000009414 blockwork Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
Definitions
- the invention relates to a loudspeaker, and more particularly to panel -form resonant bending wave loudspeaker, e.g. as exemplified by the loudspeaker described O97/09842 of New Transducers Limited. It is an object of the invention to improve the low frequency performance of panel -form resonant bending wave loudspeakers .
- Some resonant panel-form bending wave loudspeakers have no theoretical limit to the useful bandwidth that can be obtained.
- materials that are currently available for use mean that to be able to radiate at high frequencies (10kHz-20kHz) , then there is a practical limit to the lowest, useful frequency, which prevents a full range loudspeaker from operating at the lowest frequencies.
- WO97/09842 describes resonant panel-form bending wave so called "distributed mode" loudspeakers which are also arranged to move pistonically, see the embodiments of Figures 7 and 8, to aid the low frequency response of the loudspeakers.
- a resonant bending wave panel-form loudspeaker comprising a panel and a vibration exciter mounted to the panel to apply bending wave vibration thereto, characterised in that the loudspeaker is adapted to be mounted to a wall or the like surface and by a vibration exciter arranged for driving contact with the wall or the like surface.
- the loudspeaker may comprise a frame surrounding the panel and suspension means mounting the panel in the frame, and the said wall driving vibration exciter may be mounted to the frame.
- a plurality of the said wall driving vibration exciters may be mounted to the frame.
- the frame may be rectangular and a said wall driving vibration exciter may be provided in at least two adjacent corners of the frame .
- the panel may be transparent to light, and at least one vibration exciter may be mounted to a marginal portion of the panel; i.e. so as to obscure visibility through the panel to a minimum extent .
- the said wall driving vibration exciter may be adapted for low frequency operation.
- the frame may be adapted to span between two adjacent wall or the like surfaces together defining a corner, to define with the panel a resonant cavity to enhance low frequency response.
- Wall driving vibration exciters may be mounted to the frame and adapted to drive the two adjacent walls.
- the frame may comprise a back panel to define an enclosed shallow cavity, e.g. as taught in W099/52322.
- Means may be provided sealing the frame to the wall or the like surface.
- the invention is a method of operating a panel -form resonant bending wave loudspeaker to enhance low frequency performance, characterised by arranging the loudspeaker adjacent to a junction between at least two room boundaries to form a resonant air cavity between the panel and the said room boundaries.
- the method may comprise arranging the loudspeaker in contact with at least one room boundary to drive the said at least one room boundary in bending wave vibration.
- Figure 2 is a front view of a modified version of the loudspeaker of Figure 1 ;
- Figure 3 is a graph of the low frequency response curve of the loudspeaker of Figure 2 ;
- Figure 4 is a front view of a second embodiment of loudspeaker of the present invention.
- Figure 5 is a graph of the low frequency response curve of the loudspeaker of Figure 4 ;
- Figure 6 is a perspective view of a loudspeaker of the present invention positioned across a room corner
- Figure 7 is a plan view of the arrangement of Figure 6.
- a full range resonant bending wave panel-form loudspeaker generally of the kind described in WO97/09842, W099/37121, or W099/52322 all of New Transducers Limited, is adapted for mounting on a wall 2 or the like, e.g. as a picture loudspeaker.
- the loudspeaker 1 comprises a generally rectangular frame 3 surrounding a resonant panel 4 which is mounted in the frame by means of peripheral suspension 5.
- An inertial electrodynamic vibration exciter 6 is mounted on the panel 4 at a near- centre position as taught in WO97/09842 to apply bending wave energy to the panel to excite it to resonate to produce an acoustic output in response to an audio signal applied to the exciter in known matter.
- the frame also supports a fixed back panel 7, whereby the loudspeaker defines a shallow enclosure 8, e.g. as taught in W099/52322.
- the frame can be suspended from the wall in the manner of a picture frame by conventional suspension wire (not shown) fixed to the top of the frame, whereby the bottom edge of the frame rests against the wall 2 on a bead 9 which forms a generally horizontal pivot for the frame on the wall.
- the frame 3 is formed with a bracket 10 projecting into the enclosure 8 and on which an electrodynamic vibration exciter 11 is mounted, the exciter extending rearwardly through an aperture 12 in the back panel 7 so as to rest against the wall 2 for driving contact therewith.
- the portion of the exciter 11 projecting through the back panel 7 is sealed to the back panel with a flexible sealing member 13.
- the frame 3 is sealed to the wall 2 round its periphery by means of a flexible seal 14, e.g. of foamed plastics.
- the exciter may be connected to the wall by a suitable coupler 15, e.g. of soft viscous adhesive e.g. of the kind sold under the RTM "BLU-TACK" of Bostik Ltd, Great Britain.
- an audio signal is applied to the exciter 6 to cause the panel 4 to resonate to provide an acoustic output and via the exciter 11 to the wall 2 to drive the wall in vibration to enhance the low frequency response of the loudspeaker.
- a pair of such exciters 11 can be provided, one in each of the top corners of the frame .
- This wall drive will depend on the nature of the wall construction and where it is of a lightweight dry plasterboard and timber or metal stud-work, i.e. soft, construction, the extent of the drive will be greater than when the wall is of high impedance, e.g. of a dense material such as brick or blockwork, i.e. hard construction. Where the wall is hard, the effect can be to drive the loudspeaker pistonically, which again may enhance low frequency performance.
- the loudspeaker arrangement shown in Figure 2 is similar to that of Figure 1, only in this case the exciters 6 for exciting the panel 4 are arranged at the top edge of the panel as taught in W099/37121.
- the panel 4 may be transparent to light and the loudspeaker may form part of a visual display.
- the low frequency response curve of a loudspeaker as shown in Figure 2 is indicated by the dotted line, and without the wall drivers 11 by the solid line. It will be seen that the wall drive exciters 11 increase the low frequency output of the loudspeaker.
- Figures 4 and 5 correspond to Figures 2 and 3 and are in respect of an embodiment of loudspeaker generally as shown in Figure 1, but with wall drive exciters 11 in all four corners of the frame 3.
- FIGs 6 and 7 there is shown a loudspeaker 1 generally of the kind shown in Figure 1 placed across a room corner to form an enclosed cavity 16 which will be caused to resonate in the manner of a Helmholtz resonator at low frequencies to enhance the low frequency performance of the loudspeaker, and which is also arranged to drive the walls as previously described.
- INDUSTRIAL APPLICABILITY generally of the kind shown in Figure 1 placed across a room corner to form an enclosed cavity 16 which will be caused to resonate in the manner of a Helmholtz resonator at low frequencies to enhance the low frequency performance of the loudspeaker, and which is also arranged to drive the walls as previously described.
- a well designed distributed mode loudspeaker can operate over most of the audio frequency range with excellent sound distribution and low distortion. At the lower audio frequencies however the distributed mode loudspeaker panel modes become similar in size to the dimensions of the panel and the panel starts to move as a whole unit making distributed mode radiation impossible. The frequencies just above that are therefore the lowest frequencies that the panel can reproduce in the distributed mode of operation. In most normal size panels this frequency range is around the 100 to 200 Hertz region.
- Wall mounted distributed mode loudspeakers can be made to reproduce lower frequencies by arranging that the wall on which the unit is mounted can itself be driven be one or more extra exciters mounted within the loudspeaker assembly. This offers the advantage of exploiting a weakness of stud walls that might otherwise detract from low frequency fidelity. Stud walls (made from plasterboard mounted on a timber or metal frame used in most modern buildings) vibrate in sympathy with low frequency sound being propagated in a room. The resulting wall generated absorption and reflection interferes with the wanted low frequencies .
- the loudspeaker panel to be low frequency enhanced may be of a type that is driven in the normal optimum near centre position or which is edge driven.
- the low frequency excitation can be applied with multiple exciters near the corners of the panel or along the edge or with a single exciter or more arranged on the centre of mass of the loudspeaker assembly. Corner bass excitation allows easy fixing of the exciter magnets to the loudspeaker frame assembly and the extra mass of the frame makes it possible to obtain good inertia referencing down to low frequencies.
- Each low frequency exciter can be placed with its voice coil mount facing backwards so that the voice coil excitation is applied to the wall on which the loudspeaker is mounted.
- the push-pull action of the low frequency exciter/exciters drives the wall making it produce a distributed mode output using the inertial reaction of the mass of the exciter magnet or the exciter magnet and the loudspeaker frame assembly if the exciter magnet is grounded to the frame. This may be necessary to transfer enough force into the wall at the lower frequencies.
- the method of fixing the low frequency exciter to the wall can be important because of the requirement for easy fixing, easy removal and firm, hard attachment to prevent buzzing and losses.
- Blu-Tack made a good attachment medium for experimentation but more permanent fixing would require a material such as double sided tape.
- the hold of double sided tape is greater than required for the application which might make removal difficult and repositioning impossible.
- Another solution to the problem can be achieved by fixing (using e.g. double sided tape) smooth surfaced thin metal or plastic disks to the wall coated with a non-drying viscous fluid-like heat sink compound, silicone grease or the like.
- a similar disc fitted permanently to the exciter would be arranged to make contact with the wall disk when the loudspeaker frame is hung in position on the wall.
- the resulting fluid coating and air lock formed between the two disks provides a firm hold perpendicular to the wall, with no possibility of buzzing but allows easy re-positioning or removal when required.
- a hinge or universal joint may be provided between the exciter and one of the disks to ensure proper alignment with the wall surface.
- Greater wall mass or impedance results in less wall movement but instead of wall movement, greater pistonic movement of the whole loudspeaker assembly occurs. In this case it may be an advantage to reduce the mass of the whole loudspeaker assembly so that the exciter power is applied more to the air load rather than to accelerating the mass.
- the hard wall version of the enhanced low frequency panel may benefit from air sealing between the loudspeaker frame and wall as shown in Figure 1 of the accompanying drawings.
- the invention thus provides a simple way of improving the bass response of a resonant panel -form loudspeaker intended for wall mounting.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99958343A EP1135967A2 (en) | 1998-12-02 | 1999-12-01 | Resonant bending wave panel-form loudspeaker |
JP2000586133A JP2002532039A (en) | 1998-12-02 | 1999-12-01 | Loudspeaker |
AU15719/00A AU1571900A (en) | 1998-12-02 | 1999-12-01 | Loudspeaker |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9826325.4A GB9826325D0 (en) | 1998-12-02 | 1998-12-02 | Subwoofer loudspeaker |
GB9826325.4 | 1998-12-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000033613A2 true WO2000033613A2 (en) | 2000-06-08 |
WO2000033613A3 WO2000033613A3 (en) | 2000-08-10 |
Family
ID=10843391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/003990 WO2000033613A2 (en) | 1998-12-02 | 1999-12-01 | Resonant bending wave panel-form loudspeaker |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1135967A2 (en) |
JP (1) | JP2002532039A (en) |
CN (1) | CN1333992A (en) |
AU (1) | AU1571900A (en) |
GB (1) | GB9826325D0 (en) |
TW (1) | TW462204B (en) |
WO (1) | WO2000033613A2 (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2367706A (en) * | 2000-06-02 | 2002-04-10 | New Transducers Ltd | Bending wave loudspeaker with wall mounting arrangement |
US9615813B2 (en) | 2014-04-16 | 2017-04-11 | Bongiovi Acoustics Llc. | Device for wide-band auscultation |
US9621994B1 (en) | 2015-11-16 | 2017-04-11 | Bongiovi Acoustics Llc | Surface acoustic transducer |
US9638672B2 (en) | 2015-03-06 | 2017-05-02 | Bongiovi Acoustics Llc | System and method for acquiring acoustic information from a resonating body |
US9741355B2 (en) | 2013-06-12 | 2017-08-22 | Bongiovi Acoustics Llc | System and method for narrow bandwidth digital signal processing |
US9793872B2 (en) | 2006-02-07 | 2017-10-17 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US9883318B2 (en) | 2013-06-12 | 2018-01-30 | Bongiovi Acoustics Llc | System and method for stereo field enhancement in two-channel audio systems |
US9906858B2 (en) | 2013-10-22 | 2018-02-27 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US9906867B2 (en) | 2015-11-16 | 2018-02-27 | Bongiovi Acoustics Llc | Surface acoustic transducer |
US10069471B2 (en) | 2006-02-07 | 2018-09-04 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10158337B2 (en) | 2004-08-10 | 2018-12-18 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10639000B2 (en) | 2014-04-16 | 2020-05-05 | Bongiovi Acoustics Llc | Device for wide-band auscultation |
US10701505B2 (en) | 2006-02-07 | 2020-06-30 | Bongiovi Acoustics Llc. | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
US10820883B2 (en) | 2014-04-16 | 2020-11-03 | Bongiovi Acoustics Llc | Noise reduction assembly for auscultation of a body |
US10848867B2 (en) | 2006-02-07 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10848118B2 (en) | 2004-08-10 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10959035B2 (en) | 2018-08-02 | 2021-03-23 | Bongiovi Acoustics Llc | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
CN113225652A (en) * | 2020-02-06 | 2021-08-06 | 海信视像科技股份有限公司 | Display device and speaker |
US11202161B2 (en) | 2006-02-07 | 2021-12-14 | Bongiovi Acoustics Llc | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
US11211043B2 (en) | 2018-04-11 | 2021-12-28 | Bongiovi Acoustics Llc | Audio enhanced hearing protection system |
US11431312B2 (en) | 2004-08-10 | 2022-08-30 | Bongiovi Acoustics Llc | System and method for digital signal processing |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4508827B2 (en) * | 2003-10-31 | 2010-07-21 | 富士通テン株式会社 | Plate body direct drive vibration device |
US9564146B2 (en) | 2014-08-01 | 2017-02-07 | Bongiovi Acoustics Llc | System and method for digital signal processing in deep diving environment |
WO2022193716A1 (en) * | 2021-03-17 | 2022-09-22 | 海信视像科技股份有限公司 | Projection device and display apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO1998028942A1 (en) * | 1996-12-20 | 1998-07-02 | Nct Group, Inc. | Electroacoustic transducers comprising vibrating panels |
-
1998
- 1998-12-02 GB GBGB9826325.4A patent/GB9826325D0/en not_active Ceased
-
1999
- 1999-12-01 CN CN 99813812 patent/CN1333992A/en active Pending
- 1999-12-01 JP JP2000586133A patent/JP2002532039A/en active Pending
- 1999-12-01 WO PCT/GB1999/003990 patent/WO2000033613A2/en not_active Application Discontinuation
- 1999-12-01 AU AU15719/00A patent/AU1571900A/en not_active Abandoned
- 1999-12-01 EP EP99958343A patent/EP1135967A2/en not_active Withdrawn
- 1999-12-03 TW TW88121171A patent/TW462204B/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO1998028942A1 (en) * | 1996-12-20 | 1998-07-02 | Nct Group, Inc. | Electroacoustic transducers comprising vibrating panels |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2367706A (en) * | 2000-06-02 | 2002-04-10 | New Transducers Ltd | Bending wave loudspeaker with wall mounting arrangement |
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 |
US10848118B2 (en) | 2004-08-10 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10666216B2 (en) | 2004-08-10 | 2020-05-26 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US11425499B2 (en) | 2006-02-07 | 2022-08-23 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10848867B2 (en) | 2006-02-07 | 2020-11-24 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US9793872B2 (en) | 2006-02-07 | 2017-10-17 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10701505B2 (en) | 2006-02-07 | 2020-06-30 | Bongiovi Acoustics Llc. | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
US11202161B2 (en) | 2006-02-07 | 2021-12-14 | Bongiovi Acoustics Llc | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
US10069471B2 (en) | 2006-02-07 | 2018-09-04 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US9741355B2 (en) | 2013-06-12 | 2017-08-22 | Bongiovi Acoustics Llc | System and method for narrow bandwidth digital signal processing |
US10412533B2 (en) | 2013-06-12 | 2019-09-10 | Bongiovi Acoustics Llc | System and method for stereo field enhancement in two-channel audio systems |
US10999695B2 (en) | 2013-06-12 | 2021-05-04 | Bongiovi Acoustics Llc | System and method for stereo field enhancement in two channel audio systems |
US9883318B2 (en) | 2013-06-12 | 2018-01-30 | Bongiovi Acoustics Llc | System and method for stereo field enhancement in two-channel audio systems |
US10313791B2 (en) | 2013-10-22 | 2019-06-04 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US9906858B2 (en) | 2013-10-22 | 2018-02-27 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10917722B2 (en) | 2013-10-22 | 2021-02-09 | Bongiovi Acoustics, Llc | System and method for digital signal processing |
US11418881B2 (en) | 2013-10-22 | 2022-08-16 | Bongiovi Acoustics Llc | System and method for digital signal processing |
US10639000B2 (en) | 2014-04-16 | 2020-05-05 | Bongiovi Acoustics Llc | Device for wide-band auscultation |
US10820883B2 (en) | 2014-04-16 | 2020-11-03 | Bongiovi Acoustics Llc | Noise reduction assembly for auscultation of a body |
US11284854B2 (en) | 2014-04-16 | 2022-03-29 | 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 |
US9638672B2 (en) | 2015-03-06 | 2017-05-02 | Bongiovi Acoustics Llc | System and method for acquiring acoustic information from a resonating body |
US9998832B2 (en) | 2015-11-16 | 2018-06-12 | Bongiovi Acoustics Llc | Surface acoustic transducer |
US9906867B2 (en) | 2015-11-16 | 2018-02-27 | Bongiovi Acoustics Llc | Surface acoustic transducer |
US9621994B1 (en) | 2015-11-16 | 2017-04-11 | Bongiovi Acoustics Llc | Surface acoustic transducer |
US11211043B2 (en) | 2018-04-11 | 2021-12-28 | Bongiovi Acoustics Llc | Audio enhanced hearing protection system |
US10959035B2 (en) | 2018-08-02 | 2021-03-23 | Bongiovi Acoustics Llc | System, method, and apparatus for generating and digitally processing a head related audio transfer function |
CN113225652A (en) * | 2020-02-06 | 2021-08-06 | 海信视像科技股份有限公司 | Display device and speaker |
CN113225652B (en) * | 2020-02-06 | 2022-03-25 | 海信视像科技股份有限公司 | Display device and speaker |
Also Published As
Publication number | Publication date |
---|---|
TW462204B (en) | 2001-11-01 |
CN1333992A (en) | 2002-01-30 |
JP2002532039A (en) | 2002-09-24 |
GB9826325D0 (en) | 1999-01-20 |
WO2000033613A3 (en) | 2000-08-10 |
EP1135967A2 (en) | 2001-09-26 |
AU1571900A (en) | 2000-06-19 |
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