CN1526259A - Acoustic device - Google Patents
Acoustic device Download PDFInfo
- Publication number
- CN1526259A CN1526259A CNA028138651A CN02813865A CN1526259A CN 1526259 A CN1526259 A CN 1526259A CN A028138651 A CNA028138651 A CN A028138651A CN 02813865 A CN02813865 A CN 02813865A CN 1526259 A CN1526259 A CN 1526259A
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- China
- Prior art keywords
- resonance frequency
- local impedance
- plate
- mode resonance
- mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
A method of improving the modal resonance frequency distribution of a panel (2) for a distribution resonant mode bending wave acoustic device involves analysing the distribution of the modal resonance frequencies of the panel, identifying a modal resonance frequency that is non-uniformly spaced relative to adjacent modal resonance frequencies, identifying a location on said panel that exhibits anti-nodal behaviour at said modal resonance frequency and changing the local impedance to bending wave vibration at said location (6). The method has particular application to distributed mode loudspeakers (1).
Description
Technical field
The present invention relates to the audio unit that distributed resonance mode changes, particularly but be not limited to distributed resonance mode loud speaker (hereafter is " DM loud speaker ").
Background technology
This loud speaker comprises that the acoustic radiator and that can keep bending wave is installed in the transducer on this acoustic radiator, the bending wave that this transducer is used for exciting this acoustic radiator to be to produce a voice output, for example the explanation in WO97/09842 (this paper gives with reference to quoting).
According to this document, can select the overall permanence of this acoustic radiator, the bending wave pattern that should resonate roughly distributes on frequency equably.In other words, in order to eliminate " bearing against " or the caused frequency response peak value of clustering owing to pattern, to the overall permanence or the parameter of this acoustic radiator, for example size, thickness, shape, material etc. are selected.Therefore, the distribution results of this resonance bending wave pattern roughly can show the clustering of minimum degree and uneven at interval.For rectangular slab and isotropism bending stiffness, this patent document can define the lateral dimension aspect ratio of usefulness, for example 1.134: 1 especially.
Can select the position of this transducer,, particularly be coupled to low-frequency resonance bending wave pattern roughly to be coupled to this resonance bending wave pattern equably.In order to reach this purpose, the antinode quantity that initiatively resonates that this transducer can be in the vibration aspect is quite high, but the quite low on the contrary position of resonance number of nodes.Under the situation of a rectangle, the suitable specific position of being found is the place of 3/7,4/9 or 5/13 distance vertically.
Shown among the WO97/09842, analyze, not only obtain better position about transducer components, but also, in this position, should use any optionally damping so that any special undesirable frequency is handled relevant for the ability of determining physical location.WO99/02012 discloses equally on the position of part, the service quality piece.Two kinds openly can both solve some account for main frequency (greater than " outstanding outside (stick out) " mean amplitude of tide than) problem, thereby change corresponding loud speaker overall frequency response.
The open mass of WO00/22877, the selective local position 5 in the scopes of 2 to 12 grams for example, being fixed on the bending wave plate to adjust this coupled resonance is the best, makes Whole Response suitably change.This technology has special benefit aspect the low-frequency range of this assembly of expansion.
US5,615,275 describe a kind of loud speaker, comprise that one is installed in the planar separator in the frame, its rear surface is coupled with a loudspeaker voice coil, makes this voice coil loudspeaker voice coil such as same piston, push the rear surface of this barrier film, cause the abundant vibration of this barrier film, thereby produce sound effectively.Mass flexibly is installed on this barrier film, to improve its frequency response characteristic, the exact position of weight block in quantity, size and any special barrier film of quality-determining piece rule of thumb.Under characteristic frequency, the non-controlled motion that act as inhibition or resist this barrier film of this weight.
From above-mentioned WO97/09842, can find out, support the inhomogeneity increase of the resonance mode distribution of such device operation, can improve the frequency response of this device itself.When considering maybe to make a plate must be suitable for an existing space owing to various moulding, when preferred plate size discussed above can't be realized, the present invention just can be suitable for especially.
Summary of the invention
The present invention is especially at distributed resonance mode device, and its purpose is in the uniformity of the resonance mode distribution that improves this device.
Therefore, the present invention includes the method that a kind of mode resonance frequency that is used for improving the plate of a distributed resonance mode bending wave acoustic device distributes, this method may further comprise the steps:
(a) mode resonance frequency of analyzing this plate distributes;
(b) determine that a mode resonance frequency with respect to vicinity is unevenly spaced mode resonance frequency;
(c) determine on this plate, in the position of this mode resonance frequency performance antinode feature (anti-nodal behaviour); And
(d) in the local impedance of this position change to bending wave vibration.
In specific mode resonance frequency, change on this plate local impedance corresponding to one or more positions of an antinode, cause the frequency shift (FS) of this particular resonance mode.The present invention utilizes this acting in the frequency spectrum, is that unevenly spaced resonance frequency is reorientated to one or more mode resonance frequency of determining by analysis with respect to contiguous.According to this kind mode, improve the uniformity of the mode resonance frequency distribution of this device on the whole.
This local impedance changes also can produce extra resonance mode, suitably locatees the whole uniformity that it helps mode resonance frequency to distribute equally in this spectral range.
The local mechanical impedance Z
mCan represent by following formula:
Z
m=j ω quality+damping+rigidity/j ω
And may be any single combination or the common combination of damping, quality or rigidity.Conspicuous, this impedance to bending wave vibration mainly acts in the vertical direction of this plate.
Advantageously, determine, also the position that in second resonance frequency of contiguous this mode resonance frequency, shows node (nodal) feature except showing the antinode feature in this mode resonance frequency.
This method also comprises determines that a plurality of is unevenly spaced mode resonance frequency with respect to each adjacent modes resonance frequency, determine in this plate, a plurality of positions of performance antinode feature in each mode resonance frequency, and change in these a plurality of positions in wherein one or more positions local impedance to bending wave vibration.
This method further comprises the step that changes this local impedance repeatedly, distribute with the mode resonance frequency of improving on this plate, perhaps it can comprise following step: change this local impedance by variety of way, measure the uniformity of each mode resonance frequency distribution and carry out the preferred values that interpolation obtains the local impedance variation therein.Measuring process comprises the minimum center variance of calculating this mode frequency.
Especially, this interpolation procedure comprises the local impedance changing value of determining that a corresponding mode resonance frequency distributes, is better than the corresponding one local impedance changing value with rectangular slab of isotropic material characteristic and optimal aspect ratio.Perhaps, can comprise the step that changes this local impedance by variety of way, measure the variation that each mode resonance frequency distributes, and carry out the optimum value that interpolation obtains the local impedance variation therein.
About changing the step of local impedance, can comprise the quality of change at the plate of this position, particularly preferably have the flexible member and/or the element apparatus of tool damping by one, on this plate, adhere to discrete mass.Especially, this discrete mass can be by a resilient foam member attached on this plate.
The step that changes local impedance also may comprise the rigidity or the damping of the plate that changes this position.
Description of drawings
Now with reference to accompanying drawing, the present invention is described by way of example, wherein:
Figure 1A is the schematic diagram of a distributed resonance mode loud speaker;
Figure 1B represents that the mode resonance frequency of this plate among Figure 1A distributes;
Fig. 1 C is a perfect condition figure, the nodal line of expression (4,0) pattern;
Fig. 1 D is a perfect condition figure, the nodal line of expression (1,3) pattern;
After Fig. 2 and the 3 expression continuous application method of the present invention, the mode resonance frequency of this plate distributes among Figure 1A;
Fig. 4 represents when adding the FEA model in Fig. 1, the value of the cost function (L) of relative four kinds of discrete masses (m) value;
Fig. 5 represents to distribute according to the mode resonance frequency of the plate of Fig. 4 through optimizing;
Fig. 6 A-D is " driving figure " of plate among Figure 1A;
Fig. 7 A and 7B represent the cutaway view according to the improved plate of another specific embodiment of the present invention respectively, and the mode resonance frequency distribution results;
Fig. 8 A and 8B are the cutaway views of alternate figures 7A configuration; And
Fig. 9 is the schematic diagram of the further Implementation Modes of the present invention.
Embodiment
Figure 1A is the schematic diagram of a distributed mode of resonance loud speaker 1, and this kind loud speaker can be understood from aforementioned WO97/09842, is installed in plate 2 in the frame 4 comprising one by a suspension body 3, and this plate can be supported an exciter 5.This being configured in is known in the art, thereby is not discussed further.For this example, we usually hypothesis have the characteristic of isotropic material, be zero in the rigidity of the suspension body of each side, three-dimensional dimension is 288 * 216 * 2mm (corresponding to the aspect ratio of a plate 1.33: 1).Like this, this plate was different from this preferable aspect ratio of illustrating among the WO97/09842 1.134: 1.
According to method of the present invention, for this mode frequency that improves such loud speaker distributes, the mode frequency that at first must analyze this plate distributes.Figure 1B distributes by the mode frequency of this plate in spectral range among vertical line 7 expression Figure 1A, and this frequency spectrum is determined by known finite element analysis (FEA) technology.In addition, mode resonance frequency distributes and adopts empirical method as known in the art to measure.The frequency values of corresponding preceding 24 kinds of patterns sees Table 1.
After this, be necessary to determine at least a unevenly spaced mode resonance frequency of mode frequency with respect to vicinity.Under the situation of Fig. 1, the pattern that bears against when the big gap that this distributes in the time of can obviously finding out from 600 hertz and 800 hertz and 400 hertz and 920 hertz.
For the unevenly spaced pattern about 400 hertz the time, (4,0) mode frequency when for example, preferably passing through to reduce by 401 hertz (shown in line 8), and (1, the 3) pattern that does not reduce by 405 hertz shown in the line 9 reduces the beam bunching mode (the bunching of modes) in this frequency.
Subsequently, determine the mode resonance frequency to being discussed onboard, in this example be 401 hertz, the position of performance antinode feature.Fig. 1 C also is a perfect condition figure who obtains by finite element analysis, the nodal line 20 of (4,0) pattern during 401 hertz of frequencies of performance.Should be appreciated that the antinode characteristic area is positioned at in the middle of the mode line shown in the dotted line 22, just in this position, change its local impedance according to the present invention.Should be understood that above-mentioned determining step also can be undertaken by alternate manner, for example, a breadboard is carried out known laser analysis among the WO99/56497.
Preferably, adjacent modes in this spectral range, as 405 hertz (3,1) under the pattern, the influence of this impedance variation can make it reduce to minimum by the position of selecting impedance variation, described position shows the antinode feature in this resonance mode frequency except making it, also shows the node characteristic in second resonance frequency of contiguous this resonance mode frequency.Fig. 1 D represents the nodal line of contiguous (1,3) pattern, compares with Fig. 1 C, obviously be arranged in the point (figure cross A) at 1/2 place (i.e. 72 * 108 millimeters places apart from the right angle) of about 1/4 and Y-axis of X-axis will be with (4,0) pattern not with (1,3) Mode Coupling.
According to final step of the present invention, change in the local impedance of this position A to bending wave vibration.For realizing reducing the purpose of above-mentioned 401 hertz of mode resonance frequency being concerned about, advantageously, the quality of the plate by changing this position, particularly shown in Figure 1A, by in 6 position, to increase the quality of this plate, just can change of the impedance of this position at the discrete mass of this plate surface attachment one to bending wave vibration.
Can determine the amount of the actual quality that will increase by changing local impedance repeatedly, distribute: in this example, test the mass of one 4.3 gram, represented 10% of these plate gross mass 43 grams with the mode resonance frequency of improving this plate.
The distribution results of these preceding 24 kinds of patterns of performance in the finite element analysis simulation of Fig. 2.Anatomize the result and show,, prove that mass compensation is excessive because this pattern decline is excessive above required to the frequency distribution straightened.Therefore, quality of half (2.15g) replicate analysis with it, Fig. 3 is seen in the new configuration of these preceding 24 kinds of patterns, can see that therefrom this final configuration separates (4,0) and (3,1) pattern of 400 hertz effectively, has improved the whole uniformity of frequency distribution.
The uniformity also available so-called " cost function " that mode frequency distributes represents that digitally this is a kind of method (only for referencial use) illustrated among the WO99/56497 here.In this example, uniformity is measured by the minimum center variance L value of mode resonance frequency, that is:
F wherein
m, be the m (frequency of individual pattern of 0＜=m＜=M).
Fig. 4 represents is corresponding various discrete mass quantity (m represents gram) when being added in the finite element analysis pattern of Fig. 1, the value 23 of cost function (L).These values are carried out interpolation calculation, for example, this mode resonance frequency value 24 is carried out quadratic curve 24 matches, obtain optimum 25, draw the minimum cost function value and be about 44 at the m=1.29g place.What Fig. 5 represented is the distribution in the entire spectrum scope of preceding 24 kinds of patterns of this best configuration.
But, can know from Fig. 4 and to find out, any will be better greater than 0 than the uniformity of a unmodified plate (quality=0) less than the quality of 3.4 grams.In addition, corresponding to this not rectangular slab of change shown in Figure 1A, it had identical zone and material, isotropic material characteristic and above-mentioned " ideal " aspect ratio 1.134: 1, and mass value can draw one and be lower than 44.4 L value between 0.8 gram and 1.9 grams.
The invention is not restricted to single pattern, also predicted determining of a plurality of mode resonance frequency unevenly spaced with respect to adjacent separately mode resonance frequency.Further consider the pattern that Figure 1B and table 1 are listed, can find out the unevenly spaced of resonance mode also to occur, shown in the symbol B-G of Figure 1B.Obviously the frequency of (5,2) pattern that this also can be by reducing (0,2) pattern of 131 hertz, (0,3) pattern of 361 hertz, (4,0) pattern of 401 hertz, (4,2) pattern of 645 hertz, 874 hertz (2,4) pattern and 917 hertz compensates.
Utilize finite element analysis to determine to find expression on this plate the position (according to third step of the present invention) of performance antinode feature under these mode resonance frequency, will generate Fig. 6 A " driving figure ", the increase value continuously of mean amplitude of tide is by continuous lighter shadow representation among the figure.When exciting under 6 resonance frequencys that are subjected at the same time listing above, have peak swing, i.e. the plate zone of antinode feature is shown in Reference numeral 26.In wherein one or more positions in these a plurality of positions, must change local impedance, for example increase local impedance according to the present invention's the 4th step to bending wave vibration.
In zone 26, select specific position very convenient, in these positions, the response of each in corresponding and 6 the problematic resonance frequencys all is " smoothly ", i.e. uniformity, so maintenance/enhancing is to the whole flatness of the frequency response of this device.These zones are by unblanketed regional 28 expressions among Fig. 6 B.
Perhaps, local impedance changes can be limited in aforesaid those zones, promptly in described zone, on the frequency except the frequency of determining, does not have extra antinode feature basically.Fig. 6 C is a driving figure of such other frequency, and the continuous decline degree of antinode feature is represented by the intensification gradually of shade among the figure.
Though satisfy the standard of antinode feature by most of zone of proof plate among Fig. 6 C.But the result that application class is similar to " smoothly " standard of above-mentioned outburst area represents in Fig. 6 D, with the uniformity of thin out gradually shade corresponding to the continuous enhancing of all pattern of response except that 6 kinds of patterns being concerned about.
By range estimation comparison diagram 6B and 6D, can find out and change a position A (relative coordinate x=0.45 shown in Fig. 6 B and the 6D, y=0.40) impedance, whole frequency distribution uniformity obtains best the improvement with frequency level, and the position B of another relative coordinate x=0.18 and y=0.41 also obtains best the improvement.Be noted that each these relative coordinate can reflect jointly by one of x and y axle or by both.
Fig. 7 A is the cutaway view according to a plate of another specific embodiment of the present invention, wherein by having the variation that applies quality and rigidity on the flexible member (elastic force foam spacer 42), increasing local impedance, this member with the discrete masses 44 of 1.29 grams attached on this plate 40.
Because soleplate is identical with the plate that Figure 1A specific embodiment is used, reaches the correspondence position that shows antinode feature under this mode resonance frequency onboard 401 hertz unevenly spaced mode resonance frequency and also keep identical.Mass and liner be arranged on plate according on the position of the present invention.
About optimization by the local impedance of this mass and liner performance, can use mass value in first specific embodiment and optimization liner rigidity to realize near optimized first step preferably, the rigidity optimization adopt relevant mass iteration or above-mentioned based on " cost function " optimization procedures.In this example, 10N/mm is analyzed to find out optimum value to the spring rate between the 100N/mm, the result is 26.3N/mm.
In the mode profile result shown in Fig. 9 B, be cost to cause big slightly difference at 800 hertz, slightly high rigidity has been punished pattern into two at 700 hertz.Can one counteractive this fact be arranged to frequency response by improving quality in higher frequency, the further advantages that obtain are that rigidity is used to make decoupling on the mass slave plate.
Shown in Fig. 8 A is by changing the panel stiffness of this position, changing the example of local impedance.With adhere on the plate among Fig. 7 A a mass different be, the flexible member (foam spacer 42) that is installed in plate is fixed on the frame of this loud speaker (shown in Figure 1 4), for example connect by a depression bar 46 of crossing over this frame rear portion.Perhaps, shown in Fig. 8 B, can be affixed by the mode that the prodger 48 that is installed in a baffle plate box (not shown) is extended in the back, back of a frame again.
Fig. 9 is the schematic diagram of another specific embodiment, wherein represents a plate 56, also has a damper 54 except mass 50 and spring 52.This damping is intrinsic by any elastic foam liner in the specific embodiment of front in the reality, can be because of selecting to use different foam spacers different.Adopting quality and the rigidity value determined among above-mentioned method and the former mask body embodiment is the basis, can realize the optimization of damping value valuably.Especially, damping can be used for the Energy distribution of balance by the distribution pattern again of the acquisition of the method in the specific embodiment of front.
The present invention only adopts the explanation of some examples, can make various modifications not deviating from the scope of the invention.
For example, the specific embodiment of front all describes the step of the local impedance that increases select location in detail.Certainly, for the given starting point of a simple plate, it is the easiest implementing this mode (by simply adhering to quality etc.).But, also can be by reducing local impedance, for example, remove and/or replace panel material by the part, realize realizing the inhomogeneity improved situation of frequency distribution with the best.
And, the invention is not restricted to substitute or subsidiary as a kind of: also can use adhering to of coupling element with rotary freedom with respect to the vertical vibration motor element on member plane.The example of this attachment device comprises torsion spring and the attachment device that inertia is big.
Should be understood that not only loud speaker, also all belong to scope of the present invention as other audio unit of microphone etc.Except replacing arbitrary exciter, minimum usually with the difference of above-mentioned loud speaker specific embodiment with a pick-up.
Claims (15)
1. improve the method that the mode resonance frequency of the plate of a board-like distribution resonance mode bending wave acoustic device distributes, this method may further comprise the steps:
(a) mode resonance frequency of the described plate of analysis distributes;
(b) determine that a mode resonance frequency with respect to vicinity is unevenly spaced mode resonance frequency;
(c) determine on the described plate in the position of described mode resonance frequency performance antinode feature; And
(d) change described plate in described position the local impedance for bending wave vibration.
2. the method for claim 1 is characterized in that determining described position, so that also showing node diagnostic in second resonance frequency of contiguous described mode resonance frequency except showing in described mode resonance frequency the antinode feature on the described position.
3. as the described method of above-mentioned arbitrary claim, it is characterized in that comprising and determine that a plurality of is unevenly spaced mode resonance frequency with respect to each adjacent modes resonance frequency, determine in described plate a plurality of positions of performance antinode feature in each mode resonance frequency, and change in described a plurality of positions in wherein one or more positions local impedance bending wave vibration.
4. as the described method of above-mentioned arbitrary claim, it is characterized in that further being included as the step that the mode resonance frequency distribution that improves described plate changes described local impedance iteratively.
5. as each described method of claim 1 to 3, it is characterized in that comprising: changing described local impedance is different amounts, measures the uniformity of each mode resonance frequency distribution and carries out the step that interpolation obtains the preferred values of local impedance variation therein.
6. method as claimed in claim 5 is characterized in that described measuring process comprises the minimum center variance of computation schema frequency.
7. as claim 5 or 6 described methods, it is characterized in that described interpolation procedure comprises the local impedance changing value of determining corresponding to mode resonance frequency distribution, this mode resonance frequency distribution is better than corresponding one mode resonance frequency with rectangular slab of isotropic material characteristic and optimal aspect ratio and distributes.
8. as claim 5 or 6 described methods, it is characterized in that comprising that changing described local impedance is different amounts, the respective change that the measurement pattern resonance frequency distributes, and carry out the step that interpolation obtains the optimum value of local impedance variation therein.
9. as the described method of above-mentioned arbitrary claim, the step that it is characterized in that changing local impedance comprises the quality of the plate that changes described position.
10. method as claimed in claim 9, the step that it is characterized in that changing local impedance is included in adheres to a discrete mass on the described plate.
11. method as claimed in claim 9 is characterized in that the step that changes local impedance comprises the member that has flexibility by, adheres to described discrete mass on described plate.
12. method as claimed in claim 9, the step that wherein changes local impedance comprise the member that has a damping by, adhere to described discrete mass on described plate.
13. method as claimed in claim 12, the step that wherein changes local impedance comprises by a resilient foam member, adheres to described discrete mass on described plate.
14. as the described method of above-mentioned arbitrary claim, the step that wherein changes local impedance comprises the panel stiffness that changes described position.
15. as the described method of above-mentioned arbitrary claim, the step that wherein changes local impedance comprises the damping of the plate that changes described position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0120130.0 | 2001-08-17 | ||
| GB0120130A GB0120130D0 (en) | 2001-08-17 | 2001-08-17 | Loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1526259A true CN1526259A (en) | 2004-09-01 |
| CN100397952C CN100397952C (en) | 2008-06-25 |
Family
ID=9920605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB028138651A Expired - Fee Related CN100397952C (en) | 2001-08-17 | 2002-08-15 | Acoustic device |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1425937B1 (en) |
| JP (1) | JP4061267B2 (en) |
| CN (1) | CN100397952C (en) |
| AU (1) | AU2002321477A1 (en) |
| GB (1) | GB0120130D0 (en) |
| TW (1) | TW577238B (en) |
| WO (1) | WO2003026344A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101406068B (en) * | 2006-01-19 | 2012-11-28 | 新型转换器有限公司 | Bending wave acoustic device and method of making thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20051106A1 (en) * | 2005-06-13 | 2006-12-14 | Enrico Ciresa S R L | SOUND PANEL FOR THE DIFFUSION OF SOUNDS AND MUSIC AND ITS PROCESS OF MANUFACTURING. |
| KR20210076067A (en) * | 2018-10-13 | 2021-06-23 | 유니버시티 오브 로체스터 | Method, system and apparatus for selective mode control for vibrating structures |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA51671C2 (en) * | 1995-09-02 | 2002-12-16 | Нью Транзд'Юсез Лімітед | Acoustic device |
| GB9714050D0 (en) * | 1997-07-03 | 1997-09-10 | New Transducers Ltd | Panel-form loudspeakers |
-
2001
- 2001-08-17 GB GB0120130A patent/GB0120130D0/en not_active Ceased
-
2002
- 2002-08-15 AU AU2002321477A patent/AU2002321477A1/en not_active Abandoned
- 2002-08-15 JP JP2003529805A patent/JP4061267B2/en not_active Expired - Fee Related
- 2002-08-15 CN CNB028138651A patent/CN100397952C/en not_active Expired - Fee Related
- 2002-08-15 EP EP02755181A patent/EP1425937B1/en not_active Expired - Lifetime
- 2002-08-15 WO PCT/GB2002/003778 patent/WO2003026344A2/en active Application Filing
- 2002-08-16 TW TW91118536A patent/TW577238B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101406068B (en) * | 2006-01-19 | 2012-11-28 | 新型转换器有限公司 | Bending wave acoustic device and method of making thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002321477A1 (en) | 2003-04-01 |
| WO2003026344A2 (en) | 2003-03-27 |
| EP1425937B1 (en) | 2012-02-22 |
| JP4061267B2 (en) | 2008-03-12 |
| JP2005503741A (en) | 2005-02-03 |
| EP1425937A2 (en) | 2004-06-09 |
| GB0120130D0 (en) | 2001-10-10 |
| CN100397952C (en) | 2008-06-25 |
| TW577238B (en) | 2004-02-21 |
| WO2003026344A3 (en) | 2003-10-30 |
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Granted publication date: 20080625 Termination date: 20130815 |