CN105244019A - An acoustic waveguide for converting spherical acoustic waves into cylindrical acoustic waves - Google Patents
An acoustic waveguide for converting spherical acoustic waves into cylindrical acoustic waves Download PDFInfo
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- CN105244019A CN105244019A CN201510710222.7A CN201510710222A CN105244019A CN 105244019 A CN105244019 A CN 105244019A CN 201510710222 A CN201510710222 A CN 201510710222A CN 105244019 A CN105244019 A CN 105244019A
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- spigot surface
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Abstract
The invention discloses an acoustic waveguide for converting spherical acoustic waves into cylindrical acoustic waves. The acoustic waveguide comprises a group of cooperatively-used upper and lower housings. The housing is internally provided with a waveguide channel for a sound source to transmit; and the waveguide channel is internally provided with a wave surface correction device. The wave surface correction device comprises a convex geometric body arranged in the lower housing, and a concave geometric body embedded in the upper housing correspondingly and in cooperated use with the convex geometric body. The concave geometric body is opened in the bottom portion, is internally hollow, and is same with the convex geometric body in shape structure; the convex geometric body takes a straight line perpendicular to the waveguide channel as a centre symmetric axis, and is provided with a first guiding surface and a second guiding surface at the two sides of the centre symmetric axis respectively, wherein the first guiding surface, the second guiding surface and a geometric surface between the first guiding surface and the second guiding surface are in smooth connection and integrated. When the acoustic waveguide provided with the wave surface correction device is applied to sound box equipment, sound fidelity can be obviously improved, and long-distance sound transmission can be realized; and the acoustic waveguide is simple in structure and high in practicality.
Description
Technical field
The present invention relates to the parts of a kind of acoustic propagation diffusion, be specifically related to the acoustical waveguide that a kind of spherical sound wave changes into cylinder sound wave.
Background technology
The research propagation of sound wave in the finite space, such as online, face, pipe, the shape such as hole cavity in propagate, it is characterized in that sound wave is limited in propagating in certain space, this space is referred to as waveguide.For the raising propagation distance of sound and the fidelity of sound usually can use waveguide in the Spreading and diffusion of acoustics.
Sound source spatially only has clear and definite position and horizonless sound source is called point sound source (pointSource).And the sphere having the sound source of sensing to propagate to obtain, be referred to as spherical wave (sphericalwaves).Point sound source is the form radiative acoustic wave with spherical wave, and the sound pressure amplitude of radiative acoustic wave and Acoustic Wave Propagation distance (r) are inversely proportional to, and when distance is increased to 2R from R, area of spherical surface is increased to 4A by A.According to radiative acoustic wave energy conservation, sound pressure level decay 6db.So, there is what method that sound pressure level can be made unattenuated so large? below, cylinder sound wave is just introduced.
Before understanding cylinder sound wave, first will understand line source, line source is a kind of sound plant equipment.Its utilization is based on its very little vertical sensing angle, when it is vertically oriented to 0 degree, Here it is we said " cylinder sound wave "; When line source gets certain horizontal sextant angle (as 45 °), namely obtain " cylinder sound wave ".When cylinder sound wave distance is increased to 2R by R, cylinder area is increased to 2A by A, according to acoustic wave energy conservation, and sound pressure level decay 3db.Therefore, under the acoustic wave energy same case of propagation, transfer Acoustic Wave Propagation to long-distance communications that cylinder Acoustic Wave Propagation will improve sound wave greatly by spherical wave; And by multiple cylinder sound unit close-packed arrays together time, just form linear array.
But line source is in ideal, existing production technology ability, line source does not also apply to outdoor public address field, traditional public address still based on point sound source loudspeaker unit, namely based on " spherical sound wave ".Even if work stacking for multiple bugle together, the sound wave finally exported still is propagated with the form of spherical wave, and also can occur serious " interference " in this communication process, distortion appears in sound.
Summary of the invention
For above-mentioned deficiency, technical matters to be solved by this invention is to provide one can improve sound source propagation distance, and the spherical sound wave promoting acoustic fidelity changes into the acoustical waveguide of cylinder sound wave.
For solving the problem, the present invention is achieved through the following technical solutions:
A kind of spherical sound wave changes into the acoustical waveguide of cylinder sound wave, comprise one group with the use of upper and lower casing, the waveguide channels propagated for sound source is provided with in described housing, wavefront correction device is provided with in waveguide channels, described wavefront correction device comprises and is installed on convex geometry body in lower house and uses and the corresponding recessed solid be embedded on upper shell with convex geometry mates, and described recessed solid is bottom opening, inner hollow and consistent with the shape and structure of convex geometry body; Described convex geometry body is symmetrical arranged the first spigot surface and the second spigot surface, and the first spigot surface, the second spigot surface and the geometric surface between the first spigot surface and the second spigot surface are smoothly connected and one-body molded; Wherein, the first spigot surface for making circle using the width of waveguide channels as radius, the plane that then surrounds with the arc length corresponding to this circle 60 ° of central angles and chord length is the first spigot surface and the first spigot surface to tilt hexagonal angle in level counter clockwise direction.
In such scheme, the first spigot surface and the second spigot surface have overlapping position in central symmetry axis and the sectional view of any point of overlapping position is equilateral triangle structure.
Beneficial effect of the present invention is:
The present invention by arranging Wavefront Rectification device in waveguide channels, this Wavefront Rectification device is formed primarily of the convex geometry body be used in combination and recessed solid, described convex geometry body adopts two symmetrically arranged first spigot surfaces and the second spigot surface, and the first spigot surface is specially central angle is the arcwall face of 60 degree and counterclockwise tilts 120 degree in level.The acoustical waveguide adopting the above-mentioned spherical sound wave being provided with Wavefront Rectification device to change into cylinder sound wave is applied in sound-box device, the sound source of curve sound wave can be made to become linear line sound wave, compared with the audio amplifier waveguide of traditional structure: can not only acoustic fidelity be improved, can also realize transaudient at a distance, have the advantages that structure is simple, with low cost, practical.
Accompanying drawing explanation
Fig. 1, Fig. 2 are a kind of structural representation that this spherical sound wave changes into the acoustical waveguide of cylinder sound wave.
Fig. 3 is a kind of structural representation of convex geometry body.
Fig. 4 is the cross-sectional view of the convex geometry body A-A line in FIG based on Fig. 3 structure.
Fig. 5 is the another kind of structural representation of convex geometry body.
Fig. 6 is the cross-sectional view of the convex geometry body A-A line in FIG based on Fig. 5 structure.
Fig. 7 is the propagation principle analysis schematic diagram that this spherical sound wave changes into the acoustical waveguide of cylinder sound wave
Number in the figure is: 1-1, lower house; 1-2, upper shell; 2, waveguide channels; 3, convex geometry body; 3-1, the first spigot surface; 3-2, the second spigot surface; 4, recessed solid; 5, fixture; 6, loudspeaker;
Straight line L is the central symmetry axis of convex geometry body or recessed solid.
Embodiment
As shown in Figure 1 and Figure 2, a kind of spherical sound wave changes into the acoustical waveguide of cylinder sound wave, comprise one group with the use of upper and lower casing (1-2,1-1), upper and lower casing (1-2,1-1) is fixed by fixture 5.The waveguide channels 2 propagated for sound source is provided with in described housing, wavefront correction device is provided with in waveguide channels 2, described wavefront correction device comprises and is installed on convex geometry body 3 in lower house 1-2 and is used in combination and the corresponding recessed solid 4 be embedded on upper shell 1-1 with convex geometry body 3, and described recessed solid 4 is bottom opening, inner hollow and consistent with the shape and structure of convex geometry body 3.Certainly, in use procedure, recessed solid 4 also can exchange with the installation site of convex geometry body 3.
As shown in Figure 3, be a kind of structural representation of convex geometry body 3.Described convex geometry body 3 is symmetrical arranged the first spigot surface 3-1 and the second spigot surface 3-2 using the straight line L perpendicular to waveguide channels 2 as central symmetry axis and on the both sides of central symmetry axis, and the first spigot surface 3-1, the second spigot surface 3-2 and the geometric surface between the first spigot surface 3-1 and the second spigot surface 3-2 are smoothly connected and one-body molded.Wherein, the first spigot surface 3-1 is the first spigot surface 3-1 for making plane that is round, that then surround with the arc length corresponding to this circle 60 ° of central angles and chord length using the width of waveguide channels 2 as radius.When applying the convex geometry body 3 as Fig. 3 structure, then in Fig. 1, the cross-sectional view of A-A line is as shown in Figure 4, when in central symmetry axis, nothing overlaps the first spigot surface 3-1 and the second spigot surface 3-2, on convex geometry body 3, the cross-sectional view of A-A line is isosceles trapezoid, counterclockwise to tilt hexagonal angle in level based on the first spigot surface, the angle θ 1 namely in figure, θ 2 are 120 °.
As shown in Figure 5, be the another kind of structural representation of convex geometry body 3.Namely when the first spigot surface 3-1 and the second spigot surface 3-2 has overlapping position in central symmetry axis and the sectional view of any point of overlapping position is equilateral triangle structure.When applying the convex geometry body 3 as Fig. 5 structure, the cross-sectional view of A-A line as shown in Figure 6 in FIG, and because the triangle in cross-sectional view is equilateral triangle, then the angle θ 1 in figure, θ 2 are 120 °.
In use, the sound that loudspeaker 6 sends is point sound source, along with propagation becomes spherical wave, also becomes curve sound wave in the present invention.During work, sound source is propagated in waveguide channels 2, when the wavefront correction device of curve sound wave in waveguide channels 2, namely after convex geometry body 3 and recessed solid 4, what export is multiple straight waves, i.e. linear array, not only increases the distance that amplifies, also reduce " interference " of output wave, improve the fidelity of sound.What it was concrete realizes principle as shown in Figure 7: using S point as sound source, sends continuously curve ripple, when curve ripple only makes the design sketch of curve ripple after convex geometry body in convex geometry body 3, recessed solid 4, Fig. 7.Be multiple continuous print point sound sources by curve Wave Decomposition in figure.Optional a1 ~ h1 point in multiple spot sound source of comforming, because the first spigot surface 3-1 counterclockwise tilts 120 ° in level, second spigot surface 3-2 and the first spigot surface 3-1 symmetry, then the second spigot surface 3-2 tilt 120 ° in horizontal clockwise direction, draw from geometric algorithm, in figure, each point sound source is in communication process, the path length that convex geometry body 3 with recessed solid 4 are walked is the same, and what therefore make output is multiple straight waves, i.e. linear array.
The acoustical waveguide that the spherical sound wave of this structure changes into cylinder sound wave can be used as the parts that amplify of sound transmission, specifically can be used as in general sound-box device.
These are only explanation embodiments of the present invention; be not limited to the present invention, for a person skilled in the art, within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a spherical sound wave changes into the acoustical waveguide of cylinder sound wave, comprise one group with the use of upper, lower house (1-2, 1-1), the waveguide channels (2) propagated for sound source is provided with in described housing, it is characterized in that: in waveguide channels (2), be provided with wavefront correction device, described wavefront correction device comprises and is installed on convex geometry body (3) in lower house (1-1) and is used in combination and the corresponding recessed solid (4) be embedded on upper shell (1-2) with convex geometry body (3), described recessed solid (4) is bottom opening, inner hollow and consistent with the shape and structure of convex geometry body (3), described convex geometry body (3) is symmetrical arranged the first spigot surface (3-1) and the second spigot surface (3-2) using the straight line perpendicular to waveguide channels (2) as central symmetry axis and on the both sides of central symmetry axis, and the first spigot surface (3-1), the second spigot surface (3-2) and the geometric surface between the first spigot surface (3-1) and the second spigot surface (3-2) are smoothly connected and one-body molded, wherein, the first spigot surface (3-1) for making circle using the width of waveguide channels (2) as radius, the plane that then surrounds with the arc length corresponding to this circle 60 ° of central angles and chord length is the first spigot surface (3-1) and the first spigot surface (3-1) to tilt hexagonal angle in level counter clockwise direction.
2. spherical sound wave according to claim 1 changes into the acoustical waveguide of cylinder sound wave, it is characterized in that: the first spigot surface (3-1) and the second spigot surface (3-2) have overlapping position in central symmetry axis and the sectional view of any point of overlapping position is equilateral triangle structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510710222.7A CN105244019A (en) | 2015-10-27 | 2015-10-27 | An acoustic waveguide for converting spherical acoustic waves into cylindrical acoustic waves |
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| CN201510710222.7A CN105244019A (en) | 2015-10-27 | 2015-10-27 | An acoustic waveguide for converting spherical acoustic waves into cylindrical acoustic waves |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3806086A1 (en) | 2019-10-09 | 2021-04-14 | GP Acoustics International Limited | Acoustic waveguides |
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| CN101296528A (en) * | 2007-04-27 | 2008-10-29 | 日本胜利株式会社 | Sound-wave path-length correcting structure for speaker system |
| CN104811855A (en) * | 2015-04-27 | 2015-07-29 | 山东金贝壳音响有限公司 | Linear array loudspeaker high-pitch horn |
| CN205092056U (en) * | 2015-10-27 | 2016-03-16 | 刘善延 | Spherical sound wave changes into acoustics waveguide of cylinder sound wave |
| US20170069303A1 (en) * | 2014-02-28 | 2017-03-09 | Korea Institute Of Machinery & Materials | Sound wave metamaterial |
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2015
- 2015-10-27 CN CN201510710222.7A patent/CN105244019A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2114295B (en) * | 1982-01-29 | 1985-09-04 | Emi Ltd | Improvements in or relating to ultrasonic transducer arrays |
| US4726444A (en) * | 1984-07-06 | 1988-02-23 | Bridgestone Corporation | Sound wave control device |
| US5163167A (en) * | 1988-02-29 | 1992-11-10 | Heil Acoustics | Sound wave guide |
| US20030188920A1 (en) * | 2002-04-05 | 2003-10-09 | Brawley James S. | Internal lens system for loudspeaker waveguides |
| CN1666566A (en) * | 2002-07-09 | 2005-09-07 | 奥特兰诺塞利G&C公司 | Single and multiple reflection wave guide |
| CN1765148A (en) * | 2003-03-25 | 2006-04-26 | Toa株式会社 | Speaker system sound wave guide structure and horn speaker |
| CN2678062Y (en) * | 2003-12-25 | 2005-02-09 | 张志宏 | Channel control structure |
| CN1670819A (en) * | 2004-03-19 | 2005-09-21 | 伯斯有限公司 | Acoustic waveguiding |
| CN1965348A (en) * | 2004-06-07 | 2007-05-16 | 皇家飞利浦电子股份有限公司 | Acoustic device with variable focal length |
| CN101296528A (en) * | 2007-04-27 | 2008-10-29 | 日本胜利株式会社 | Sound-wave path-length correcting structure for speaker system |
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| CN205092056U (en) * | 2015-10-27 | 2016-03-16 | 刘善延 | Spherical sound wave changes into acoustics waveguide of cylinder sound wave |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3806086A1 (en) | 2019-10-09 | 2021-04-14 | GP Acoustics International Limited | Acoustic waveguides |
| US11626098B2 (en) | 2019-10-09 | 2023-04-11 | Gp Acoustics International Limited | Acoustic waveguides |
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Application publication date: 20160113 |