CN101784000A - Reflection-type paraboloid sound guiding device - Google Patents
Reflection-type paraboloid sound guiding device Download PDFInfo
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- CN101784000A CN101784000A CN200910228156A CN200910228156A CN101784000A CN 101784000 A CN101784000 A CN 101784000A CN 200910228156 A CN200910228156 A CN 200910228156A CN 200910228156 A CN200910228156 A CN 200910228156A CN 101784000 A CN101784000 A CN 101784000A
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Abstract
The invention relates to a reflection-type paraboloid sound guiding device which is characterized in that a forming method of the wall of a paraboloid sound guiding pipe comprises the following steps of: respectively outwards moving two symmetrical parts of a parabola from an original point; and then rotating a paraboloid formed by the parabola by taking the original point of the parabola as an axle centre before the parabola is outwards moved, wherein the top end of the paraboloid sound guiding pipe is a circular plane, the wall of the paraboloid sound guiding pipe is in a paraboloid shape, and the integral paraboloid sound guiding pipe is in a basin-shaped structure. The reflection-type paraboloid sound guiding device has a total acoustic pressure level in a 0-degree direction higher than that of the conventional high horn type loudspeaker by more than 3 dB when reproducing sounds under the condition of using a same sound head, is especially suitable for long-distance broadcasting with high directional property, has small size, light weight and convenient for carrying, transportation and installation, can be combined to line sound sources or surface sound sources of various types with different sizes if designed into a square in appearance and has intense directional property, higher output sound power and further broadcasting transmission distance due to the line sound sources or the surface sound sources combined by the loudspeaker.
Description
Technical field
The present invention relates to the electroacoustic techniques field, particularly a kind of highly directive reflection-type paraboloid sound guiding device that can improve horn loudspeaker sound (0 °) direction sound radiation pressure level.
Background technology
At present, at home and abroad in the horn loudspeaker of production and selling, or at home and abroad in the teaching material or the publications on science and technology that can see of some institutions of higher education, the professional has designed various difform horns for the horn speaker of different purposes, and the length of its horn also has nothing in common with each other.But these difform horns, a common ground is arranged: the aditus laryngis that all is horn is little, and opening is big.All be to begin to calculate according to the sectional area from aditus laryngis, along with the increase of leaving the aditus laryngis distance, the cross-sectional area of horn constantly increases, when calculating the horn mouth, and the cross-sectional area maximum.Why different the shape of these horns is, all are because various horns are when the distance of leaving aditus laryngis constantly increases, the speed difference that the cross-sectional area of horn increases.
According to the different classification of the curve of horn: taper, index are linear, hyperbola and parabola shaped horn;
The different classification of length according to horn also can be divided into collapsible and direct-injection type.
In the arenas or the hall, sometimes in order to widen the directive property of loud speaker, also make the multi-format horn or some fence are installed in the horn mouth, pointing capability is broadened.The purpose of doing these work all is in order to widen the directive property of loud speaker.Make in the arenas or the hall, be sitting in the audience at edge, also can be the same with the audience in the middle of being sitting in, hear the sound programme that frequency distortion is less, improve hearing effect.
And study the energy accumulating of sound in a little scope, propagate into the research and the experimental work of the highly directive loud speaker at far place, that also carries out is less.Although current have many R﹠D institutions and universities and colleges all studying for remote high power broadcast, mostly at the input electric power that increases the sound head with improve direct-injection type horn shape time up and down.
All horn loudspeakers all are the area of the area of horn mouth greater than aditus laryngis at present, and if not sound just can not be propagated in horn.The size of horn extension index and the size of horn open area have determined the lower frequency limit (being the cut-off frequency of horn) and the frequency response of horn transmission sound.Sound is propagated from horn, and because of the cross-sectional area of its horn is enlarging gradually, sound wave is just broadcast to the horn oral instructions according to the diffusion angle of horn shape.Sound wave is inner at horn to be not a plane wave just, when passing to the horn outside, has just almost become a spherical wave.So, designing the horn shape of horn loudspeaker come what may, the directional property of the sound wave that it radiate does not have much improvement.Make loud speaker have sharp-pointed directive property, must make the sound wave of loud speaker radiation become plane wave as far as possible.At least be plane wave at " horn " mouthful sound wave of propagating with interior part.And this prior art was short of just, therefore, the axial directional property of acoustic radiation has very big room for improvement.
Summary of the invention
Purpose of the present invention is exactly for overcoming the deficiencies in the prior art, at the difficult problem of acoustic radiation axial directional property of acoustic conductance, provide the sharpened and acoustic conductance that improves (0 °) sound pressure level on the horn loudspeaker acoustic radiation direction of a kind of directional property that can make horn loudspeaker to device to device.
The present invention realizes by such technical scheme: reflection-type paraboloid sound guiding device, comprise interior pipe, reflection tube (core pipe) and paraboloid sound guiding pipe, it is characterized in that, the formation method of paraboloid sound guiding tube wall is that the parabola two parts symmetrical is moved outside respectively from initial point, parabola initial point before moving again is the parabola that axle center rotation parabola forms, paraboloid sound guiding pipe top is that circular flat, tube wall are parabolic shape, and integral body is bathtub construction;
Interior pipe and reflection tube are interconnected to the horn assembly by collapsible horn structure, and the thin end of interior pipe is connected with loud speaker sound head to the lower nozzle place; The circular flat center on described paraboloid sound guiding pipe top has a hole; The horn assembly of interior pipe and reflection tube formation is fixedly installed in the circular flat center drilling place on paraboloid sound guiding pipe top, the loud speaker sound head that is connected with interior pipe is installed on the outside of paraboloid sound guiding pipe top center drilling, the axis of loud speaker sound head and paraboloidal central axes; The parabolic method that forms of described paraboloid sound guiding tube wall comprises the steps:
Step 1: in rectangular coordinate system, establish y
2=2px is the parabola about x axial symmetry, the process origin of coordinates;
Step 2: perpendicular to the x axle and by in the plane of the origin of coordinates, with the origin of coordinates is the center, with a certain numerical value r is that radius is made a circle, separating from the summit about the axisymmetric parabolical two parts of x, the outside parallel displacement r of difference, parabola after the translation is divided into axisymmetric two parts about x, and it is the center of circle that two sections parabolical summits after the translation all are positioned at the origin of coordinates, is on the circumference of radius with r; Parabola after the translation is revolved three-sixth turn around the x axle, and forming a top has circular flat bottom, paraboloidal bathtub construction is arranged on every side; Parabolic equation after the translation is: y=(2px)
1/2+ r;
R=(radius of reflection tube opening part+with the interior caliber of reflection tube opening same horizontal plane to section radius) ÷ 2
The paraboloid sound guiding tube opening can be made as square structure, method is to be a cross section length of side that the central shaft of foursquare cavity square body (virtual) of 2R and the central shaft of paraboloid sound guiding pipe of the present invention coincide, cavity square body lower port square-shaped planar is a paraboloid sound guiding tube opening planes overlapping with the plane that is positioned at x=H (this plane is vertical with the x axle), and the cavity square body moves suitable distance vertically downward along the x axle;
The paraboloid sound guiding tube wall at square-shaped planar four sidelines and the tangent position of paraboloid sound guiding pipe is shaped as part plan, forms paraboloid sound guiding pipe side tangent plane;
The not tangent position of square-shaped planar four sidelines and paraboloid sound guiding pipe corresponding paraboloid sound guiding tube wall shape still is parabolic; The paraboloid sound guiding pipe is not cut the position from the mouth of pipe and extends out to four drift angles of square-shaped planar, forms the mouth of pipe arm of angle; Paraboloid sound guiding pipe radius is not cut off less than the circle in the cross section of R, and this part of circle is complete; Paraboloid sound guiding pipe radius is cut off greater than the circular arc portion in the cross section of R; Parabolic and the intersection point that is positioned at the plane of x=H are to be on four camber lines of symmetry at four angles.
Cutting back paraboloid sound guiding tube opening flange extension is made as square, is square and goes out a square openings structure reflection-type paraboloid sound guiding device.
The paraboloid sound guiding pipe mouth of pipe is that four straight lines are connected shape at interval with four sections arcs; The tube wall local shape of paraboloid sound guiding pipe is the side tangent plane; Four segmental arc parts of the paraboloid sound guiding pipe mouth of pipe radially level stretch out, and form four mouth of pipe arms of angle.
The square structure reflection-type paraboloid sound guiding device can be formed loud speaker matrix (combination loudspeaker), can random set synthesize various forms of loud speaker battle arrays; Can constitute " line source " or " area source of sound "; Thereby can have stronger directive property, higher sound pressure level, farther sound transmission.
Advantage of the present invention is:
1. the directive property of apparatus of the present invention strong (0 ° of direction of polar diagram is sharp-pointed): under the condition of using same sound head, use device sound reproduction of the present invention, can be than the horn sound reproduction of using general horn loudspeaker, more than the high 3dB of overall sound pressure level on 0 ° of direction.That is to say, using under the condition of same sound head, with device sound reproduction of the present invention, when audition at a distance, the loudness effect in the time of reaching two general horn loudspeakers and raise one's voice to its utmost simultaneously.Device of the present invention is specially adapted to remote, the broadcasting of directional property by force.Be equivalent on 0 ° of direction, the electro-acoustic conversion efficiency of sound head be doubled.
2. the volume of apparatus of the present invention is little, in light weight.Apparatus of the present invention with the collapsible horn speaker of bore relatively, it is short to have " horn " length, lightweight advantage.Compare with the direct-injection type horn speaker, acoustic conductance of the present invention only is equivalent to below 1/3 of direct-injection type horn speaker length to the length of device.Advantage is more obvious.Therefore, the small product size of apparatus of the present invention is little, in light weight, is easy to carry, transports and install.
3. if device configuration design quadrate of the present invention, be more suitable in making combination speaker.As with 4,6,9 or 16 foursquare apparatus of the present invention products, be installed in the same plane, just can form various forms of " line source " or " area source of sound " that differ in size." line source " or " area source of sound " that set of speakers is synthetic can make its directional property become more sharp-pointed, and the acoustical power of output is bigger, and the distance of broadcast transmitted is farther.
Description of drawings
Fig. 1, reflection-type paraboloid sound guiding device principle of compositionality figure, and as Figure of abstract;
Fig. 2, square structure reflection-type paraboloid sound guiding device front view;
Fig. 3, square structure reflection-type paraboloid sound guiding device A-A are to view;
Fig. 4, reflection-type paraboloid sound guiding device exploded view A;
Fig. 5, reflection-type paraboloid sound guiding device exploded view B;
The combination speaker figure that Fig. 6, reflection-type paraboloid sound guiding device constitute;
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing:
Extremely shown in Figure 6 as Fig. 1, reflection-type paraboloid sound guiding device is the focus characteristics that has utilized parabolic focus, the horn mouth of horn loudspeaker is placed on the paraboloidal focus, and sound becomes cluster and is parallel to the sound of parabolic central shaft to parabolic external radiation after parabolic reflector.Can be similar to the formation plane sound wave in parabolic radiation exit.After acoustic irradiation is gone out, can on the acoustic radiating direction, play the effect of assembling acoustic energy, make the directional property of this device sharpened.
Be illustrated in figure 1 as the reflection-type paraboloid sound guiding device principle of compositionality, equation Y
2=2px is the parabola through the rectangular coordinate system origin of coordinates.This parabola is about the curve of x axle for symmetry.If is this parabola rotating shaft with the x axle, rotate a circle, just can draw a parabola.Paraboloidal summit is exactly the origin of coordinates.Parabolic focus also is paraboloidal focus, and focus is on the x axle, and the distance of the focus and the origin of coordinates is p/2.
Parabola has such character: light or electromagnetic wave from paraboloidal focus is sent, to all directions radiation, be radiated parabolic light and electromagnetic wave after reflection, and can all advance along the direction parallel with the x axle, form parallel light or the electromagnetic wave of cluster.Otherwise light that cluster is parallel or electromagnetic wave incide on the parabola along the x axle, after reflection, can all focus on the paraboloidal focus.
Experimental results show that, reflection-type paraboloid sound guiding device compares with the collapsible horn speaker of identical bore, equal length, uses same sound head as driver element, on the x direction of principal axis, under the situation of same test distance, the former sound pressure level is than more than the high at least 3dB of the latter.This is equivalent to two horn loudspeakers (latter) sound pressure level that sounding obtained simultaneously, the sound pressure level of the sound that last " reflection-type paraboloid sound guiding device " that could push up sends.That is to say, on the direction of x axle, use same sound head, is the horn difference, and the former doubles than the latter's sound conversion efficiency.
Realize that the present invention need carry out following design process:
1, design and make a suitable parabola: in rectangular coordinate system, y
2It is symmetry about the x axle that=2px is one, and through the parabola of the origin of coordinates, the parabolic focus coordinate is (p/2,0).With the x axle is rotating shaft, and this parabola is rotated a circle around the x axle, just obtains a parabola.This paraboloidal central shaft (rotating shaft) is exactly the x axle.Paraboloidal focus on the x axle, with the distance of parabolic summit (origin of coordinates) also be p/2.
In device of the present invention, the sound head is assembled to paraboloidal top, and the interior pipe 3 of its horn and the axis of reflection tube 2 overlap with the x axle just in time by paraboloidal focus, has influenced parabolic focusing to sound.In order to solve focus issues, need parabola is outwards moved, its paraboloidal focus is also corresponding outwards to be moved.
Perpendicular to the x axle and by in the plane of the origin of coordinates, be the center with the origin of coordinates, be radius with a certain numerical value r, make a circle.Separating from the summit about the axisymmetric parabolical two parts of x, distinguish outside parallel displacement r, it is the center of circle that two sections parabolical summits after the translation are dropped on respectively with the origin of coordinates, is on the circumference of radius with r.Around the rotation of x axle, becoming a bottom has " circle is flat ", paraboloidal bathtub construction is arranged on every side the parabola after the translation, and Here it is, and we are needed.
During design, make the length of radius r just in time equal the radius of reflection tube 2 opening parts in apparatus of the present invention and interior pipe 3 in 1/2nd of the radius sum in same horizontal level cross section.
{ r=(radius of reflection tube opening part+with the interior caliber of reflection tube opening same horizontal plane to section radius) ÷ 2}
2, design and make the horn component system of a horn loudspeaker: horn assembly, reflection tube 2 that comprises that an energy is connected with loud speaker sound head and interior pipe 3; And interior pipe 3 and reflection tube 2 are interfixed and install according to certain mode and spacing.
3, the horn system of the above-mentioned horn loudspeaker of making is installed in the parabola, is " reflection-type paraboloid sound guiding device " of the present invention.
4, test:, successively it is installed on device neutralization of the present invention and is installed in the general horn loudspeaker that bore is identical, length is similar with same sound head.Under identical test condition, measure respectively.The measurement project comprises: sound pressure frequency response curve, acoustic radiation axis (x axle) are gone up the overall sound pressure level at predetermined distance place, and measure both directional properties, then the contrast test data.
Further set forth process of the present invention below in conjunction with embodiment: make paraboloid sound guiding pipe 1 parabola.Making a bore is φ 410mm, and length (thickness) is the reflection-type paraboloid sound guiding device of 180mm.
At first set up parabolical equation: y
2=2px establishes p=90, and then parabolic equation is: y
2=180x, the parabola focus is (45,0).
Perpendicular to the x axle and by in the plane of the origin of coordinates, be the center of circle with the origin of coordinates, with r=40mm radius, make a circle.This circle is exactly " at the bottom of the basin " of the paraboloid sound guiding pipe 1 of bathtub construction, it is the circular flat (11) on paraboloid sound guiding pipe top, " tub wall " of bathtub construction, promptly to be exactly with the x axle be rotating shaft to the tube wall of paraboloid sound guiding pipe 1, after moving in addition, its equation is: (2px)
1/2+ 40=(180x)
1/2+ 40 parabola is the parabola that radius spins out;
The span of x is 0-180mm in the formula.
Paraboloid sound guiding pipe 1 opening can be made as square structure, method is to be a cross section length of side that the central shaft of foursquare cavity square body of 2R and the central shaft of the parabolic device of the present invention coincide, cavity square body lower port square-shaped planar is that the paraboloid sound guiding tube opening overlaps with the plane that is positioned at x=H (this plane is vertical with the x axle), the cavity square body moves suitable distance vertically downward along the x axle, cut away part garden arc, the reflection-type paraboloid sound guiding device that cuts out, paraboloid sound guiding pipe 1 radius are that the circular arc portion in cross section of R is just in time tangent with the limit of square-shaped planar.
If the foursquare length of side of cavity square body lower port is 410mm, parabolic full circle part (not being cut part) maximum gauge also is 410mm, and maximum radius is 205mm.
Half of square-shaped planar diagonal angle line length is 290mm.Parabolic with respectively surrender an arc perpendicular to the x axle and by the square-shaped planar that x=180mm is ordered mutually in four angular positions of paraboloid sound guiding pipe 1.The vertical range of four arcs and x axle all equals:
(180*180)
1/2+40＝180+40＝220mm；
Four arcs are 290-220=70mm to the distance of four drift angles of square-shaped planar.
After square-shaped planar moved down cutting, the tube wall local shape of the paraboloid sound guiding pipe 1 at square-shaped planar four sidelines and paraboloid sound guiding pipe 1 tangent position was the plane, formed paraboloid sound guiding pipe side tangent plane 12;
The shape of the corresponding paraboloid sound guiding pipe 1 tube wall part in the not tangent position of square-shaped planar four sidelines and paraboloid sound guiding pipe 1 still is parabolic;
Paraboloid sound guiding pipe 1 from position (four arcs) that the mouth of pipe is not cut radially level stretch out, extend to four drift angles of square-shaped planar and overlap the position, form four mouth of pipe arms of angle 13;
The total length that interior pipe 3 and reflection tube 2 are assembled up can not be higher than parabolic inner total depth 180mm, notices that again the opening part height and position of reflection tube 2 must be consistent with paraboloidal focus height and position.The length of pipe 3 is 132.5mm in determining as calculated, and the length of reflection tube 2 is 95mm.
The interior pipe 3 of reflection-type paraboloid sound guiding device and the cross-sectional area of reflection tube 2 are pressed the exponential line horn and are calculated: determine that as calculated it is suitable that the extension index of interior pipe 3 and reflection tube 2 is m=0.1508 (cm of unit).
Make the taper reflection round platform 4 of anti-standing wave.In order to prevent to produce standing wave between sound wave that reflection tube 2 sends and parabolic bottom surface (circular flat on paraboloid sound guiding pipe top), installed a taper additional on the base plane of special root at interior pipe 3 and reflected sloping platform 4 with base plane angle at 45.
Test the present invention:, successively be installed on the reflection-type paraboloid sound guiding device that bore is φ 410mm and bore is on the horn of general horn loudspeaker of φ 400mm, use Denmark B﹠amp with same sound head; The Polse test macro instrument of K company is tested respectively in anechoic chamber, and the overall sound pressure level and the directive property test result of (0 °) on its pressure frequency response, the central axis direction compared.
The 10 watts of power of sound head of feeding, measuring distance is 10 meters, test signal is the frequency response curve of the central axial direction of pink noise.Both comparison shows that its A weighted overall sound pressure level test result, use acoustic conductance of the present invention is used the high 3.79dB of overall sound pressure level from general horn loudspeaker horn to the overall sound pressure level ratio of device.The overall sound pressure level of its Lin shelves, the former also exceeds 3.35dB than the latter.
And when remote audition, the test result of A weighted more approaches the sensation of people's ear.The frequency response curve of analysis pink noise as can be seen, medium-high frequency section more than 315Hz, acoustic conductance of the present invention is all higher to the sound pressure level of device, and the frequency range of this broad people's ear frequency range the most responsive just to sound, so during remote audition, with same sound head, use acoustic conductance of the present invention when device, the people can feel that broadcast program is clearer louder.
Reflection-type paraboloid sound guiding device can accumulate in the acoustic energy of loud speaker radiation on axis (0 °) direction of loud speaker effectively, makes the directional property of loud speaker become sharp-pointed.Thereby the sound pressure level on the horn loudspeaker axis direction is effectively improved, generally can improve more than the 3dB.Can be sound transmission farther.
Can be under the situation that does not increase loud speaker (input electric power), the sound pressure level (laser propagation effect) in the time of on test (or audition) point, obtaining being equivalent to double loud speaker and raise one's voice to its utmost.
Be designed to foursquare acoustic conductance to device, be more convenient for being combined into " point sound source " or " area source of sound ".Like this, both can improve output acoustic power, and can further make its directional property become more sharp-pointed again, on central axial direction, more effectively assemble the energy of sound.So the combination of reflection-type paraboloid sound guiding device is more suitable for remote, high power broadcast.
The sound head of loud speaker is installed on the outside at center, parabolic top.The axis of sound head and paraboloidal central axes.
The axis of horn and parabolic central axes.The thin end opening of reflection tube is facing to the center on parabolic top.
In order to form loud speaker battle array (being combination loudspeaker), need the acoustic conductance of circle is made foursquare structure to device.Like this, can the synthetic various forms of loud speaker battle arrays of random set.Can be " line source " or " area source of sound ".Can have stronger directive property, higher sound pressure level, farther sound transmission.
The intention of square structure comprises the condition that to the method for paraboloidal cutting mode, aggregate erection, has all satisfied aggregate erection, and combination loudspeaker forms line source or area source of sound, has stronger directive property.High-power remote broadcasting more needs combination loudspeaker.Aggregate erection is convenient in the present invention, and the space when having utilized aggregate erection better between each loudspeaker unit enlarges paraboloidal reflective surface area, raising sound cumulative effect.
According to the above description, can realize the solution of the present invention in conjunction with art technology.
Claims (3)
1. reflection-type paraboloid sound guiding device, comprise interior pipe (3), reflection tube (2) and paraboloid sound guiding pipe (1), it is characterized in that, the formation method of paraboloid sound guiding pipe (1) tube wall is that the parabola two parts symmetrical is moved outside respectively from initial point, parabola initial point before moving again is the parabola that axle center rotation parabola forms, paraboloid sound guiding pipe (1) top is that circular flat (11), tube wall are parabolic shape, and integral body is bathtub construction; Interior pipe (3) and reflection tube (2) are interconnected to the horn assembly by collapsible horn structure, and the thin end of interior pipe (3) is connected with loud speaker sound head to the lower nozzle place; Circular flat (11) center on described paraboloid sound guiding pipe (1) top has a hole; The horn assembly of interior pipe (3) and reflection tube (2) formation is fixedly installed in circular flat (11) the center drilling place on paraboloid sound guiding pipe (1) top, the loud speaker sound head that is connected with interior pipe (3) is installed on the outside of paraboloid sound guiding pipe (1) top center drilling, the axis of loud speaker sound head and paraboloidal central axes; The parabolic method that forms of described paraboloid sound guiding pipe (1) tube wall comprises the steps:
Step 1: in rectangular coordinate system, establish y
2=2px is the parabola about x axial symmetry, the process origin of coordinates; Step 2: perpendicular to the x axle and by in the plane of the origin of coordinates, with the origin of coordinates is the center, with a certain numerical value r is that radius is made a circle, separating from the summit about the axisymmetric parabolical two parts of x, the outside parallel displacement r of difference, parabola after the translation is divided into axisymmetric two parts about x, and it is the center of circle that two sections parabolical summits after the translation all are positioned at the origin of coordinates, is on the circumference of radius with r; Parabola after the translation is revolved three-sixth turn around the x axle, and forming a top has circular flat bottom, paraboloidal bathtub construction is arranged on every side;
Parabolic equation after the translation is: y=(2px)
1/2+ r;
R=(radius of reflection tube opening part+with the interior caliber of reflection tube opening same horizontal plane to section radius) ÷ 2.
2. reflection-type paraboloid sound guiding device according to claim 1 is characterized in that paraboloid sound guiding pipe (1) opening is a square structure, and paraboloid sound guiding pipe (1) mouth of pipe is that four straight lines are connected shape at interval with four sections arcs; The tube wall local shape of paraboloid sound guiding pipe (1) is side tangent plane (12).
3. as reflection-type paraboloid sound guiding device as described in the claim 1,2, it is characterized in that four segmental arcs parts of paraboloid sound guiding pipe (1) mouth of pipe radially level stretch out, and form four mouth of pipe arms of angle (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910228156A CN101784000B (en) | 2009-11-10 | 2009-11-10 | Reflection-type paraboloid sound guiding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910228156A CN101784000B (en) | 2009-11-10 | 2009-11-10 | Reflection-type paraboloid sound guiding device |
Publications (2)
| Publication Number | Publication Date |
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| CN101784000A true CN101784000A (en) | 2010-07-21 |
| CN101784000B CN101784000B (en) | 2012-09-05 |
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ID=42523776
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|---|---|---|---|
| CN200910228156A Expired - Fee Related CN101784000B (en) | 2009-11-10 | 2009-11-10 | Reflection-type paraboloid sound guiding device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828234A (en) * | 2016-05-10 | 2016-08-03 | 青岛歌尔声学科技有限公司 | Earphone |
| CN108600908A (en) * | 2018-06-13 | 2018-09-28 | 清华大学 | Reflection-type air acoustic horn |
| CN109474867A (en) * | 2017-09-07 | 2019-03-15 | 潘博 | Waveguide assembly for conduct acoustic waves |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4588042A (en) * | 1984-07-23 | 1986-05-13 | Palet Timothy J | Parabolic speaker |
| CN1886002A (en) * | 2006-07-04 | 2006-12-27 | 浙江大学 | Sound collecting and transmitting device |
| CN201123122Y (en) * | 2007-08-03 | 2008-09-24 | 席葆树 | Sound wave beaming irradiator |
-
2009
- 2009-11-10 CN CN200910228156A patent/CN101784000B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828234A (en) * | 2016-05-10 | 2016-08-03 | 青岛歌尔声学科技有限公司 | Earphone |
| CN105828234B (en) * | 2016-05-10 | 2019-02-15 | 青岛歌尔声学科技有限公司 | A kind of earphone |
| CN109474867A (en) * | 2017-09-07 | 2019-03-15 | 潘博 | Waveguide assembly for conduct acoustic waves |
| CN109474867B (en) * | 2017-09-07 | 2023-09-19 | 潘博 | Waveguide device for propagating acoustic waves |
| CN108600908A (en) * | 2018-06-13 | 2018-09-28 | 清华大学 | Reflection-type air acoustic horn |
| CN108600908B (en) * | 2018-06-13 | 2020-07-21 | 清华大学 | Reflection type air sound horn |
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| CN101784000B (en) | 2012-09-05 |
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