WO2000028780A1 - Loudspeakers comprising a phase uncorrelated diffuse sound source - Google Patents
Loudspeakers comprising a phase uncorrelated diffuse sound source Download PDFInfo
- Publication number
- WO2000028780A1 WO2000028780A1 PCT/GB1999/003613 GB9903613W WO0028780A1 WO 2000028780 A1 WO2000028780 A1 WO 2000028780A1 GB 9903613 W GB9903613 W GB 9903613W WO 0028780 A1 WO0028780 A1 WO 0028780A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- duct
- loudspeaker according
- panel
- loudspeaker
- acoustic
- Prior art date
Links
- 238000005452 bending Methods 0.000 claims description 12
- 230000005855 radiation Effects 0.000 claims description 11
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000006098 acoustic absorber Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000005236 sound signal 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
Definitions
- the invention relates to loudspeakers. It is an object of the invention to provide means whereby sound from a loudspeaker can be channelled to one or more remote locations.
- a loudspeaker comprising a phase uncorrelated diffuse sound source and a duct or wave guide coupled to the sound source to direct acoustic energy from the source, the duct or wave guide having a substantially parallel section extending from the vicinity of the sound source and a termination positioned remotely from the panel.
- the sound source may comprise a bending wave mode acoustic radiator panel.
- a transducer may be fixed to the panel to excite resonant bending waves therein, the resonant bending wave modes associated with each of the axes of the panel being arranged to be interleaved in frequency and the transducer location being chosen preferentially to couple to the resonant bending wave modes .
- the duct may be shaped as a narrow slot in cross- section, or may be of any other desired cross-sectional shape .
- the duct may be terminated by a horn section.
- the panel may be located in the duct to couple acoustic radiation from both sides of the panel.
- An acoustic reflector may be coupled to the duct and to the sound source to direct acoustic radiation into the duct.
- the duct may have a plurality of terminations and these may be spaced along the duct .
- a plurality of the panels may be coupled to the duct.
- the duct may be folded.
- the loudspeaker may comprise an attenuator controlling sound output from a duct termination.
- Means may be provided for subdividing the duct into a plurality of wave guides extending along the duct.
- the duct may be subdivided in two directions, i.e. laterally and vertically.
- An acoustic reflector may be disposed to direct the acoustic output from a duct termination.
- Enclosure means may enclose one face of the panel .
- the plane of the panel may be parallel to the axis of the duct .
- the invention has-been described in terms of a loudspeaker, it will be appreciated that it may find other applications, e.g. as a microphone or as an acoustic absorber, whether passive or active.
- Figure 1 is a front cross-sectional view of a first embodiment of loudspeaker of the invention
- Figure 2 is a cross-sectional side view of the loudspeaker of Figure 1;
- Figure 3 is a front cross-sectional view of a second embodiment of loudspeaker of the invention;
- Figure 4 is a cross-sectional side view of a third embodiment of loudspeaker of the invention.
- Figure 5 is a cross-sectional side view of a fourth embodiment of loudspeaker of the invention.
- Figure 6 is a cross-sectional side view of a fifth embodiment of loudspeaker of the invention.
- Figure 7 is a cross-sectional side view of a sixth embodiment of loudspeaker of the invention
- Figure 8 is a cross-sectional side view of a seventh embodiment of loudspeaker of the invention
- Figure 9 is a detail of a modification.
- BEST MODES FOR CARRYING OUT THE INVENTION The invention relies on largely phase uncorrelated, diffuse radiation properties of a sound source or generator e.g. a flat resonant bending wave panel, for example of the kind described in WO97/09842 to allow coupling to an acoustic fluid, normally air, contained in a shallow volume well coupled to the source of sound energy.
- a sound source or generator e.g. a flat resonant bending wave panel, for example of the kind described in WO97/09842 to allow coupling to an acoustic fluid, normally air, contained in a shallow volume well coupled to the source of sound energy.
- a sound source or generator e.g. a flat resonant bending
- a diffuse source allows for good integration of acoustic power over its radiating surface and that power may be conducted via fluid coupling to a remote point via a duct . Modal resonance which are normally severe in such a duct are mitigated due to diffuse uncorrelated nature of the acoustic energy entering the duct .
- the duct termination may radiate directly, which if in the form of a narrow slot or similar aperture has wide directivity and is not frequency controlling or frequency selective. If modified directive properties are required then various sizes shapes and combinations of acoustic horn known to the art may be added to the open end of the duct.
- the principle of diffuse coupling may extend to simple single reflective elements acting as vestigial horns or part ducts, and the length of the duct may be varied to a point where the horn section is almost directly presented to the diffuse source.
- the duct can be presented in the plane of the radiator and achieve effective action.
- the sound energy on the surface of the source can be divided and directed down more than one duct or wave guide, and these may be of unequal lengths and if required the several outputs may be recombined smoothly after passage down the ducts or wave guides.
- Twin ducts may be used to utilise the energy from both sides of the diffuse source.
- the preferred source is one or more bending wave panels but other such sources include an array of small conventional pistonic speakers fed phase randomised signals or an array of digital speaker elements driven by signals suitably processed to provide a diffuse acoustic function.
- the duct provides a beneficial integrating function which may be designed as a low pass acoustic filter to complete the desired response from an array element digital speaker.
- the twin ducts may be laterally disposed to provide sound at two separated locations e.g. across the passenger compartment of a vehicle benefiting from a single centrally or near centrally located sound generator.
- the duct may be straight, curved or folded to allow a slim assembly to be fitted into difficult locations where conventional speaker could not be placed.
- Wide range sound may ducted to substantially small radiating apertures, for example the slots (normally disguised behind an acoustically transparent grille) at the sides of a television monitor.
- Duct performance may be further enhanced by cellular subdivision to inhibit cross standing waves .
- the duct and/or horn has a low frequency loading function which may be simply calculated using lumped parameters. This may beneficially load the sound source to enhance the low range performance by added/matched air mass and by a baffle effect due to extended path length between the front and rear of the sound generators where relevant.
- the rear of the panel or multiple panel (with same or frequency selective/differential area drive/form) or multiple cone type sound generators may have a partially or wholly enclosed rear chamber (s) for additional resonant enhancement and control of the low frequency acoustic path between front and rear.
- Duct height and/or cross sectional area is influential in determining the higher frequency point for smooth transmission of sound energy.
- a rectangular duct of 30mm height will show some frequency dependency above 10kHz, whereas a 10mm section will perform well to beyond 25kHz.
- the sub division of the duct may be extended to the vertical direction to subdivide the duct still further for maintained transmission performance at higher frequencies.
- the exit area of duct driven by a diffuse source has an influence on loudness and relative to the intrinsic area of the exit a variable area mechanism such as a moveable blanking plate over the duct termination may provide a convenient and effective form of loudness control without a significant loss in sound quality.
- a horn directive element may be applied after the mechanical loudness control device.
- a user volume control may be remote from the sound generator.
- a duct control device may be provided at any convenient location along the duct .
- a horn termination is driven well by the duct of the invention, and the horn can provide an effective and calculable control of directivity for a diffuse source.
- the duct termination alone provides uniform wide angle radiation, an almost perfect slot or near point source.
- the fluid coupling and duct integration action reconfigures the sound energy such that the directive effects of coincidence are no longer a feature of the resultant acoustic output.
- the duct can be any length, and terminations may be provided along the length of the duct to give a simple distributed low level sound system. Multiple resonant panels could feed a duct, and a multiple panel arrangement could be made more compact by folding or bending the region in front of the panel , before the duct .
- a loudspeaker 1 comprising a resonant bending-wave panel 2 generally of the kind described in International patent application WO97/09842 of New Transducers Limited, which is driven by a vibration exciter 3 fed with an electrical audio signal from suitable audio amplifier (not shown) .
- the panel 2 is resiliently mounted by its edges on a resilient suspension 4 in a housing 5 in the form of a parallel sided shallow slot-like duct 6 having a closed end 7 and an open end 8 which opens into a flared horn section 9 which ends at opening or termination 10.
- the housing may be made from any suitable non resonant material such as those materials from which loudspeaker enclosures are normally constructed, e.g. medium density fibreboard or plastics.
- at least the duct may be made at a flexible material, provided that is suitably dense as to be substantially non resonant in the frequency range of its intended use.
- the duct may be in the form of a flexible pipe, e.g. of high density polyethylene or the like.
- FIG. 3 shows an embodiment of a loudspeaker very similar to that of Figures 1 and 2.
- the inner or closed end 7 of the duct 6 is formed as a curved, e.g. parabolic, reflector to reflect acoustic radiation from the panel 2 towards the open end of the duct.
- the plane of the panel 2 is set at right angles to the direction of the duct whereas in Figures 1 and 2 the plane of the panel is disposed in the direction of the duct.
- the horn section is outwardly flared or curved, whereas in the embodiment of Figures 1 and 2, the horn section is conical.
- Figure 4 shows a loudspeaker arrangement generally as shown in Figures 1 and 2 above and in which a housing 5 defining a parallel sided duct 6 has an open end 8 which terminates the duct, and a closed end 7.
- the housing supports a resonant bending-wave panel 2 on a resilient suspension 4 so that acoustic radiation from one face 17 of the panel facing into the housing 5 is directed along the duct to a remote location wherein the sound radiation is emitted from the open end of the duct.
- the loudspeaker shown in Figure 5 is the same as that shown in Figure 4 except that the duct is terminated by a horn 9.
- the loudspeaker of Figure 6 is similar to that of Figure 5, but in this case the acoustic radiation from the side 15 of the panel facing away from the duct is contained within a cavity 14 defined by an enclosure 13 fixed to our integral with the housing 5 fixed to our integral with the having 5 to prevent radiation from the side 15 of the panel 2 from reaching the ambient surroundings .
- the loudspeaker of Figure 7 is similar to that of Figure 4 and in this case the housing 5 defines an opposed pair of parallel sided ducts 6, one being associated with each face or side 15 of the panel 2, the ducts extending in opposite directions towards their open ends 8.
- Figure 8 is a modification of the loudspeaker of Figure 7 and in which the two ducts 6 each associated with one face of the panel 2 extend in the same direction and in spaced relation.
- Figure 9 shows that the termination 8 of a duct 6 of a loudspeaker as described above may be modified by placing an acoustic reflector 16 adjacent to the duct termination to focus and direct the sound in the direction shown by the arrows.
- the reflector is in the form of a parabolic reflector.
- the present invention thus provides a simple loudspeaker mechanism for ducting sound to remote location.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Stereophonic System (AREA)
Abstract
Description
Claims
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000581851A JP2002530031A (en) | 1998-11-06 | 1999-11-04 | Loudspeaker with diffuse sound source without phase correlation |
IL14243099A IL142430A0 (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
BR9915048-4A BR9915048A (en) | 1998-11-06 | 1999-11-04 | Speakers that comprise a diffuse sound source not correlated with phase |
EP99952692A EP1125472B1 (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
AU64806/99A AU746872B2 (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
RU2001115712/09A RU2001115712A (en) | 1998-11-06 | 1999-11-04 | LOUDSPEAKERS CONTAINING A DIFFUSED SOURCE SOURCE WITH CORRELATED PHASES |
NZ510972A NZ510972A (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising coupling of phase uncorrelated diffuse sound source to a waveguide |
AT99952692T ATE256959T1 (en) | 1998-11-06 | 1999-11-04 | LOUDSPEAKER WITH PHASE UNCORRELATED DIFFUSE SOUND SOURCE |
CA002349856A CA2349856A1 (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
DE69913726T DE69913726D1 (en) | 1998-11-06 | 1999-11-04 | SPEAKERS WITH PHASE-UNCORRELATED DIFFUSER SOUND SOURCE |
KR1020017005572A KR20010083946A (en) | 1998-11-06 | 1999-11-04 | Loudspeakers Comprising a Phase Uncorrelated Diffuse Sound Source |
HK01106541A HK1035987A1 (en) | 1998-11-06 | 2001-09-15 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9824255.5A GB9824255D0 (en) | 1998-11-06 | 1998-11-06 | Loudspeakers |
GB9824255.5 | 1998-11-06 | ||
GB9914410.7 | 1999-06-22 | ||
GBGB9914410.7A GB9914410D0 (en) | 1999-06-22 | 1999-06-22 | Reflector |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000028780A1 true WO2000028780A1 (en) | 2000-05-18 |
Family
ID=26314618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/003613 WO2000028780A1 (en) | 1998-11-06 | 1999-11-04 | Loudspeakers comprising a phase uncorrelated diffuse sound source |
Country Status (15)
Country | Link |
---|---|
EP (1) | EP1125472B1 (en) |
JP (1) | JP2002530031A (en) |
KR (1) | KR20010083946A (en) |
CN (1) | CN1140158C (en) |
AT (1) | ATE256959T1 (en) |
AU (1) | AU746872B2 (en) |
BR (1) | BR9915048A (en) |
CA (1) | CA2349856A1 (en) |
DE (1) | DE69913726D1 (en) |
HK (1) | HK1035987A1 (en) |
IL (1) | IL142430A0 (en) |
NZ (1) | NZ510972A (en) |
RU (1) | RU2001115712A (en) |
TW (1) | TW462203B (en) |
WO (1) | WO2000028780A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1178702A3 (en) * | 2000-08-02 | 2006-05-31 | Alan Brock Adamson | Wave shaping sound chamber |
WO2009042383A3 (en) * | 2007-09-27 | 2009-07-16 | Bose Corp | Acoustic waveguide mode controlling |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4351209B2 (en) * | 2003-03-25 | 2009-10-28 | ティーオーエー株式会社 | Sonic guide structure for speaker system and horn speaker using the same as throat section |
JP5188839B2 (en) * | 2008-02-28 | 2013-04-24 | 株式会社ジャムコ | Flat panel speaker |
JP5276956B2 (en) * | 2008-11-13 | 2013-08-28 | 浜名湖電装株式会社 | Electric horn |
EP2508008B1 (en) * | 2009-12-02 | 2016-09-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Flat loudspeaker |
JP6044164B2 (en) * | 2011-09-09 | 2016-12-14 | ヤマハ株式会社 | Sound equipment |
CN108464012B (en) * | 2016-01-14 | 2020-04-07 | 哈曼国际工业有限公司 | Bidirectional loudspeaker with floating waveguide |
JP7094687B2 (en) * | 2017-10-31 | 2022-07-04 | 川崎車両株式会社 | Railroad horn device |
CN115022758A (en) | 2019-09-20 | 2022-09-06 | 广州视源电子科技股份有限公司 | Electronic device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956636A (en) * | 1956-06-11 | 1960-10-18 | Sipko L Boersma | Loudspeaker |
EP0353092A2 (en) * | 1988-07-28 | 1990-01-31 | Lucas Fabri-Conti | Apparatus and method for reproducing high fidelity sound |
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO1998043464A1 (en) * | 1997-03-22 | 1998-10-01 | New Transducers Limited | Personal computing devices comprising a resonant panel loudspeaker |
-
1999
- 1999-11-04 DE DE69913726T patent/DE69913726D1/en not_active Expired - Lifetime
- 1999-11-04 WO PCT/GB1999/003613 patent/WO2000028780A1/en not_active Application Discontinuation
- 1999-11-04 IL IL14243099A patent/IL142430A0/en unknown
- 1999-11-04 RU RU2001115712/09A patent/RU2001115712A/en not_active Application Discontinuation
- 1999-11-04 KR KR1020017005572A patent/KR20010083946A/en not_active Application Discontinuation
- 1999-11-04 EP EP99952692A patent/EP1125472B1/en not_active Expired - Lifetime
- 1999-11-04 NZ NZ510972A patent/NZ510972A/en unknown
- 1999-11-04 BR BR9915048-4A patent/BR9915048A/en not_active Application Discontinuation
- 1999-11-04 JP JP2000581851A patent/JP2002530031A/en active Pending
- 1999-11-04 AU AU64806/99A patent/AU746872B2/en not_active Ceased
- 1999-11-04 CN CNB998125431A patent/CN1140158C/en not_active Expired - Fee Related
- 1999-11-04 AT AT99952692T patent/ATE256959T1/en not_active IP Right Cessation
- 1999-11-04 CA CA002349856A patent/CA2349856A1/en not_active Abandoned
- 1999-11-11 TW TW088119775A patent/TW462203B/en not_active IP Right Cessation
-
2001
- 2001-09-15 HK HK01106541A patent/HK1035987A1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956636A (en) * | 1956-06-11 | 1960-10-18 | Sipko L Boersma | Loudspeaker |
EP0353092A2 (en) * | 1988-07-28 | 1990-01-31 | Lucas Fabri-Conti | Apparatus and method for reproducing high fidelity sound |
WO1997009842A2 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Acoustic device |
WO1998043464A1 (en) * | 1997-03-22 | 1998-10-01 | New Transducers Limited | Personal computing devices comprising a resonant panel loudspeaker |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1178702A3 (en) * | 2000-08-02 | 2006-05-31 | Alan Brock Adamson | Wave shaping sound chamber |
WO2009042383A3 (en) * | 2007-09-27 | 2009-07-16 | Bose Corp | Acoustic waveguide mode controlling |
US7886869B2 (en) | 2007-09-27 | 2011-02-15 | Kevin Bastyr | Acoustic waveguide mode controlling |
Also Published As
Publication number | Publication date |
---|---|
KR20010083946A (en) | 2001-09-03 |
NZ510972A (en) | 2002-07-26 |
TW462203B (en) | 2001-11-01 |
CN1140158C (en) | 2004-02-25 |
CN1324556A (en) | 2001-11-28 |
EP1125472A1 (en) | 2001-08-22 |
DE69913726D1 (en) | 2004-01-29 |
RU2001115712A (en) | 2003-06-10 |
HK1035987A1 (en) | 2001-12-14 |
AU746872B2 (en) | 2002-05-02 |
ATE256959T1 (en) | 2004-01-15 |
IL142430A0 (en) | 2002-03-10 |
JP2002530031A (en) | 2002-09-10 |
CA2349856A1 (en) | 2000-05-18 |
BR9915048A (en) | 2001-08-07 |
EP1125472B1 (en) | 2003-12-17 |
AU6480699A (en) | 2000-05-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0988772B1 (en) | Personal computing devices comprising a resonant panel loudspeaker | |
US6324052B1 (en) | Personal computing devices comprising a resonant panel loudspeaker | |
EP0334238B1 (en) | Acoustic Apparatus | |
US20070256888A1 (en) | Speaker System With Improved Frequency Response | |
GB2333927A (en) | Housing for an electro-acoustic transducer, e.g. loudspeaker, earphone, microphone | |
US5123500A (en) | Loudspeaker enclosure | |
US7010138B1 (en) | Loudspeakers | |
WO2001037611A1 (en) | System and method to enhance reproduction of sub-bass frequencies | |
JPH05268690A (en) | Loud speaker unit having wide-angle directivity | |
EP1125472B1 (en) | Loudspeakers comprising a phase uncorrelated diffuse sound source | |
KR101071963B1 (en) | Acoustic reproduction device with improved directional characteristics | |
EP1292170B1 (en) | Structure for preventing the generation of standing waves in a wireless telephone set | |
US4437541A (en) | Controlled dispersion speaker configuration | |
EP1201102B1 (en) | Loudspeaker | |
US6870942B1 (en) | Loudspeaker for line array sound system | |
ZA200102754B (en) | Loudspeakers comprising a phase uncorrelated diffuse sound source. | |
JPH01135295A (en) | Loudspeaker system | |
WO2008050123A1 (en) | Loudspeakers | |
MXPA01004508A (en) | Loudspeakers comprising a phase uncorrelated diffuse sound source | |
US8254614B2 (en) | Horn speaker with hyperbolic paraboloid lens | |
JPH01279698A (en) | Speaker system | |
JPH05137188A (en) | Speaker system | |
JPH05344579A (en) | Speaker system and television receiver using the speaker system | |
JPH0470199A (en) | Phase inverting type speaker system | |
MXPA99008699A (en) | Personal computing devices comprising a resonant panel loudspeaker |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 99812543.1 Country of ref document: CN |
|
ENP | Entry into the national phase |
Ref document number: 1999 64806 Country of ref document: AU Kind code of ref document: A |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1999952692 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 64806/99 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2001/02754 Country of ref document: ZA Ref document number: 142430 Country of ref document: IL Ref document number: 200102754 Country of ref document: ZA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 510972 Country of ref document: NZ |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020017005572 Country of ref document: KR |
|
ENP | Entry into the national phase |
Ref document number: 2349856 Country of ref document: CA Ref document number: 2349856 Country of ref document: CA Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2001/004508 Country of ref document: MX |
|
ENP | Entry into the national phase |
Ref document number: 2000 581851 Country of ref document: JP Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 1999952692 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020017005572 Country of ref document: KR |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWG | Wipo information: grant in national office |
Ref document number: 64806/99 Country of ref document: AU |
|
WWG | Wipo information: grant in national office |
Ref document number: 1999952692 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1020017005572 Country of ref document: KR |