CN220915404U

CN220915404U - Waveguide and horn, loudspeaker box, array and multistage array comprising same

Info

Publication number: CN220915404U
Application number: CN202322232827.2U
Authority: CN
Inventors: 徐运虎
Original assignee: Guangzhou Youmi Acoustic Technology Co ltd
Current assignee: Guangzhou Youmi Acoustic Technology Co ltd
Priority date: 2023-08-18
Filing date: 2023-08-18
Publication date: 2024-05-07
Anticipated expiration: 2033-08-18

Abstract

The utility model provides a dual-source wave front non-common-cavity horizontal coupling plane wave sound source waveguide which is Y-shaped and comprises two horizontally arranged waveguide channels, wherein the waveguide channels are used for connecting a plane wave sound source and are composed of a first channel, a first reflecting surface, a second channel, a second reflecting surface and a third channel which are sequentially connected, and each channel and each reflecting surface are rectangular right-angle surfaces. The wave guide of the utility model enables two or more plane wave sound sources to be coupled in a wave front non-common cavity at a horizontal position through periscope type reflection channels, and the coupled sound waves are wave fronts of plane wave shapes and have no optical interference. The waveguide of the present utility model increases the maximum sound pressure level by 6dB or more relative to a single driver vertically coupled waveguide of the prior art.

Description

Waveguide and horn, loudspeaker box, array and multistage array comprising same

Technical Field

The utility model relates to an acoustic wave guide, in particular to a wave guide for coupling radiation in a horizontal vertical direction of a plurality of identical or different driver sound source wave fronts of a loudspeaker without sharing a cavity.

Background

Along with the improvement of the requirement of the sound expansion field on the reproduction quality of the loudspeaker, the sound pressure requirement covering the far-near field range is uniform and uniform, and the line sound source with better sound expansion performance than the traditional point sound source is gradually popularized. A linear array sound box (loudspeaker system) formed by diffusing a linear sound source is characterized in that the vertical angle of a single loudspeaker is small, the problem of acoustic interference between loudspeakers is effectively solved, and meanwhile, the sound pressure attenuation of the linear array sound box (loudspeaker system) is slow and the transmission distance is long.

As shown in fig. 1, the point sound source 2 is spread in a spherical wave manner, and is characterized by a large coverage angle in the horizontal and vertical directions and a fast sound pressure attenuation, and the sound intensity of the spherical wave at any distance from the sound source is inversely proportional to the square of the distance. As shown in fig. 1, when the sound source distance increases from R to R2, i.e., twice R, the area of the wavefront increases from a to 4A, and the sound intensity decreases to 1/4. The distance R is doubled and the sound pressure level decays by 6dB.

As shown in fig. 2, the line source 4 is composed of a plurality of cylindrical wave sound source loudspeaker systems, and the tweeter driver is typically a ribbon driver approaching a plane wave, such as the loudspeaker disclosed in US2007/0160233 A1. Or by converting a conventional compression driver into a cylindrical wave sound source resembling a plane wave by means of an associated waveguide device, such as the sonic waveguide disclosed in US5163167 a. The vertical high frequency part of the line source loudspeaker is directed at a very narrow angle, typically around 5-10 degrees, and attenuates 3dB each time the source distance is doubled by the energy of the cylindrical wave. The wavefront generated by the line source 4 is a coaxial cylindrical wave, called a cylindrical wave. A cylindrical wave is a wave whose wavefront is a coaxial cylinder. It is envisaged that there will be an infinitely long source of uniform line sound in an infinitely uniform medium, the wave produced by this being the ideal cylindrical sound wave. In cylindrical sound waves, the sound pressure amplitude is uniformly distributed in the axial direction, and is inversely proportional to the square root of the distance from the axis in the radial direction. Its radial sound intensity is inversely proportional to the first power of the distance from the axis. As shown in fig. 2, when the sound source distance increases from R to R2, i.e., twice R, the area of the wavefront increases from a to 2A, and the sound intensity decreases to 1/2. The linear sound source loudspeaker box has the characteristic of reduced transmission attenuation, and can have more sound expansion efficiency. The high-frequency coupling characteristic is good, the distortion caused by interference can be reduced, and the high-quality sound expansion is facilitated. The directivity control is better when the whole string sound source loudspeaker box works, and the more the number of the sound sources in the vertical direction is, the lower the controllable frequency of the directivity is.

Following the market demand, various manufacturers design array loudspeaker box products based on line sound sources to be applied to professional sound amplification. For example, US7965857B2, which is a family patent of US2007/0160233A 1. The patent discloses a belt-type tweeter driver suitable for linear sound source amplification applications. From the description and drawings of US2007/0160233A1 it is known that a loudspeaker comprises two identical metal shells having 2 extending grooves or sound channels for the sound produced by the loudspeaker to propagate outwards. A horn may be connected to the speaker, the horn providing a progressively widening wave front.

In addition, there are also many manufacturers designing horn waveguides based on compression drivers that design cylindrical wave transitions that approximate the shape of plane waves. The earliest patent was represented by patent US005163167a, which was filed as representative in france HEIL CHRISTIAN. The specification and drawings of US005163167a indicate that the waveguide is made up of 3 elements, two elements being symmetrical along a vertical plane and comprising shells holding the core, each shell comprising a rear side plate and a front side plate and being connected by a central plate, the front side plates having an opening therebetween, the shells surrounding the core and having a void. This patent discloses a method of geometrically interpreting the path difference (delta) between the wave fronts of a compression driver in a waveguide through a circular exit, through a parabolic and hyperbolic acoustic channel slot, to a rectangular exit, where the wave fronts pass the surface of the phase plug at approximately equal times, i.e. the path difference (delta) between the wave fronts of the compression driver in the waveguide through a circular aperture and the waveguide out of the rectangular exit is: delta is less than or equal to lambda/4, (lambda is the wavelength of the highest available frequency of the design target) the error is less than or equal to one quarter wavelength of the highest operating frequency, and is not necessarily the exact same. But with errors as small as the acceptable range of frequencies that are available for product design work.

The two line array line sound sources represented by the above can only realize the vertical array combination coupling of single sound source sound boxes, as shown in figure 13 of US 005163167A. And two perpendicular sound sources must operate in the same frequency range or else continuous coherent sound waves cannot be generated. The size w of a qualified rectangular opening of the linear sound source is smaller than or equal to the wavelength of the highest frequency of the design target, namely: w is less than or equal to lambda. For example, the width of the rectangular outlet of the belt type treble in US2007/0160233A1 is 18mm, and the width of the rectangular outlet of the waveguide in US005163167A is 18mm, and the upper limit of the highest frequency of the operation can be calculated to be 19KHz according to W.ltoreq.lambda.

In order to meet the coupling condition, the center distance M between two adjacent sound sources should be less than or equal to one half of the upper-limit wavelength of frequency, namely: m is less than or equal to lambda/2. Therefore, when the coupling upper limit frequency Fh=18 KHz of the high-pitched sound unit, the sound source center distance M can be calculated according to Fh=18 KHz, and the sound velocity V0=343M/s, wherein M is less than or equal to 9.5 mm.

As shown in fig. 3A, when the two belt-type tweeter drivers 6 are horizontally arranged, their corresponding coupling upper limit frequencies fh=3155 Hz when the sound source pitch M thereof is 109 mm. Fig. 3A shows the interference situation for two belt treble, with the straight line representing a plane wave propagation at frequencies less than 3155Hz, and the onset of comb filtering interference at frequencies greater than 3155Hz.

When two compressed treble drivers 8 are arranged horizontally via the waveguide 10 as in US005163167a, as shown in fig. 3B, their corresponding upper coupling limit frequencies fh=9555 Hz are found at a sound source center distance M of 18 mm, and fig. 3B shows the interference of the two waveguides, with the straight line representing a plane wave-like propagation of less than 9555Hz and the onset of interference at frequencies greater than 9555 Hz.

It can be seen that due to physical structure problems, whether it be belt treble or related cylindrical wave conversion devices of which french HEIL CHRISTIAN is representative, perfect coupling of multiple drivers in the horizontal direction cannot be achieved due to physical structure reasons, and the expected usable frequency is less than 10KHz, which is far less than 18KHz when a single vertical coupling works.

Disclosure of utility model

Aiming at the problem that the prior industry line sound source technology represented by the above cannot realize perfect coupling of the horizontal plane, the utility model simultaneously realizes the following purposes when realizing perfect coupling of the horizontal plane:

It is another object of the present utility model to provide a periscope type reflective horn to couple two or more plane wave sound sources (high or medium sound) in a horizontal position wave front without sharing a cavity through a specific reflective sound wave channel slot, and to couple sound waves into a plane wave shape and a wave front without optical disturbance.

The utility model also aims to provide a sound pressure level increasing output method, wherein wave fronts of a plurality of drivers which work at the same time and have the same frequency are not coupled in a common cavity in a sound box, and compared with the wave guide maximum sound pressure level of the vertical coupling of a single driver in the prior art in the current industry, the wave guide maximum sound pressure level is increased by more than or equal to 6dB.

It is another object of the present utility model to provide a method that allows multiple driver sound sources operating in the same frequency range to produce common wavefront coupling in the same wavefront non-common cavity in a horizontal position with almost zero acoustic interference

It is another object of the utility model to provide a method that allows multiple driver sound sources operating in different frequency ranges to produce common coupling in the same wavefront at the horizontal position without sharing the cavity and with almost zero acoustic interference

It is another object of the present utility model to provide a method of generating one or more wave fronts in one or more frequency ranges within a loudspeaker box that couple sound waves of the same frequency range in a wire array suspended adjacent loudspeaker box and that are free from optical interference.

The utility model provides a dual-source wave front non-common-cavity horizontal coupling plane wave sound source waveguide which is Y-shaped and comprises two horizontally arranged waveguide channels, wherein the waveguide channels are used for connecting a plane wave sound source, each waveguide channel consists of a first channel, a first reflecting surface, a second channel, a second reflecting surface and a third channel which are sequentially connected, and the first channel, the first reflecting surface, the second channel, the second reflecting surface and the third channel are all rectangular right-angle surfaces.

As an improvement, on the horizontal sectional view, the first channel is composed of a first channel inner wall and a first channel outer wall, the second channel is composed of a second channel inner wall and a second channel outer wall, the third channel is composed of a third channel inner wall and a third channel outer wall, the first channel inner wall, the first reflecting surface, the second channel inner wall and the third channel inner wall are sequentially connected to form an inner wall of the waveguide channel, and the first channel outer wall, the second reflecting surface and the third channel outer wall are sequentially connected to form an outer wall of the waveguide channel.

As an improvement, on the horizontal sectional view, the inner wall of the first channel and the outer wall of the first channel are parallel to each other and have the same length, the inner wall of the second channel and the outer wall of the second channel are parallel to each other and have the same length, the first reflecting surface and the second reflecting surface are parallel to each other and have the same length, the outer wall of the third channel is parallel to the inner wall of the first channel, the inner wall of the third channel is in a fold line shape, the inlet section of the inner wall of the third channel is parallel to the outer wall of the third channel, one end of the outlet section of the inner wall of the third channel is connected with the inlet section of the inner wall of the third channel, and one end of the outlet section of the third channel is connected with the outlet of the third channel.

As an improvement, on the horizontal sectional view, the inner wall of the first channel and the outer wall of the first channel are parallel to each other and have the same length, the inner wall of the second channel and the outer wall of the second channel are parallel to each other and have the same length, the first reflecting surface and the second reflecting surface are parallel to each other and have the same length, the outer wall of the third channel is parallel to the inner wall of the first channel, the inner wall of the third channel is in a straight line shape, one end of the inner wall of the third channel is connected with the outlet end of the inner wall of the second channel, and one end of the inner wall of the third channel is connected with the outlet of the third channel.

As an improvement, the acoustic wave rays pass through the first channel, the first reflecting surface, the second channel, the second reflecting surface, and the third channel, and the acoustic wave rays of the acoustic wave rays passing through the first reflecting surface and the second reflecting surface conform to the law of reflection, that is, the incident angle is equal to the reflection angle: θi1=θr1=θi2=θr2. The path difference (delta) of the sound wave passing through the waveguide channels is as follows: delta is less than or equal to lambda/4.

As an improvement, the plane wave sound source can replace the first channel and be directly connected with the reflecting surface.

The utility model also provides a high-pitch horn, which comprises the dual-sound source wave front non-common-cavity horizontal coupling high-pitch waveguide and two plane wave sound sources arranged at the inlet end of the high-pitch wave channel.

The utility model also provides a sound box, which comprises the high-pitch horn, two middle-low-pitch horns which are horizontally and symmetrically arranged on two sides of the high-pitch horn, and a box body.

The utility model also provides a plane wave sound source horizontal array, which comprises the plane wave sound source waveguide which is not commonly and horizontally coupled with the front of the double-sound source wave, and the high-pitch horn arranged at the inlet end of the waveguide channel.

The utility model also provides a multistage plane wave sound source horizontal array, which comprises the double-sound source front non-common-cavity horizontal coupling plane wave sound source waveguide and the plane wave sound source horizontal array arranged at the inlet end of the waveguide channel.

Drawings

Fig. 1 is a schematic view of a point sound source and a spherical wave.

Fig. 2 is a schematic diagram of a line sound source and a cylindrical wave.

Fig. 3A is a schematic diagram of two ribbon tweeter drivers horizontally coupled.

Fig. 3B is a schematic diagram of two tweeter drivers horizontally coupled through a conventional waveguide.

Fig. 3C is a schematic diagram of the horizontal coupling of the waveguide and the tweeter driver of the present utility model.

Fig. 4 is a cross-sectional view of the tweeter horn of the present utility model in a horizontal plane through the center of the waveguide.

Fig. 5A is a schematic diagram of the path of propagation of acoustic rays in the waveguide channel 20.

Fig. 5B is a schematic illustration of the outer wall of the waveguide channel 20 of the present utility model.

Fig. 6A is a horizontal cross-sectional view of the waveguide of the present utility model applied to a speaker design.

Fig. 6B is a front view of the waveguide of the present utility model as applied to a loudspeaker design.

Fig. 7 is a graph comparing test curves of the waveguide of the present utility model with those of the prior art under the same test conditions.

Fig. 8A is a prior art waveguide level 3D directivity diagram.

Fig. 8B is a prior art waveguide vertical 3D directivity pattern.

Fig. 9A is a waveguide horizontal 3D directivity pattern in accordance with an embodiment of the present utility model.

Fig. 9B is a vertical 3D directivity pattern of a waveguide according to an embodiment of the present utility model.

Fig. 10 is a graph showing the comparison of sound pressure levels for the same test conditions as in the prior art in the case of the present utility model.

Fig. 11A and 11B are graphs of frequency response of the present utility model operating at the same frequency band using two identical drivers.

Fig. 12A and 12B are graphs of the frequency response of the present utility model operating at different frequency bands using two different drivers.

Fig. 13A is a schematic diagram of a vertical array of speakers according to a waveguide application design of the present utility model.

Fig. 13B and 13C are diagrams of the coupling of waveguides of the present utility model in a vertical array of speakers.

Fig. 14 is a schematic diagram of a multi-plane wave sound source horizontal array scheme using the tweeter horn of the present utility model through a multi-stage waveguide.

Detailed Description

The utility model is further described below with reference to the drawings.

As shown in fig. 1, which is a schematic diagram of a point sound source and a spherical wave, the wavefront generated by the point sound source 2 is a concentric spherical surface, which is called a spherical wave. It is envisaged that in an infinitely uniform medium there will be a spherical sound source whose surface expands and contracts rapidly and each point on the surface will vibrate in phase and amplitude and the wave radiated to the surrounding medium will be a spherical wave. Such sound waves are spherically symmetric, i.e. the magnitude of the sound pressure is only related to the distance from the centre of the sphere. Any shape of sound source can be regarded as a point sound source as long as its size is much smaller than the wavelength, radiating spherical waves. For spherical waves, the sound intensity at any distance from the sound source is inversely proportional to the square of the distance. As shown, when the sound source distance increases from R to R2, i.e., twice R, the area of the wavefront increases from A to 4A and the sound intensity decreases to 1/4.

As shown in fig. 2, the wave fronts generated by the line sound source 4 are coaxial cylindrical waves, called cylindrical waves. A cylindrical wave is a wave whose wavefront is a coaxial cylinder. It is envisaged that there will be an infinitely long source of uniform line sound in an infinitely uniform medium, the wave produced by this being the ideal cylindrical sound wave. In cylindrical sound waves, the sound pressure amplitude is uniformly distributed in the axial direction, and is inversely proportional to the square root of the distance from the axis in the radial direction. Its radial sound intensity is inversely proportional to the first power of the distance from the axis. As shown, when the sound source distance increases from R to R2, i.e., twice R, the area of the wavefront increases from A to 2A and the sound intensity decreases to 1/2.

As shown in fig. 3A, when the two belt-type treble drivers 6 are arranged horizontally, their corresponding coupling upper limit frequencies fh=3155 Hz when the sound source pitch M thereof is 109 mm because of the volume limitation of the belt-type treble drivers. Fig. 3A shows the interference situation for two belt treble, with the straight line representing a plane wave propagation at frequencies less than 3155Hz, and the onset of comb filtering interference at frequencies greater than 3155Hz.

As shown in fig. 3C, fig. 3C is a schematic diagram of the horizontal coupling of a waveguide and planar wave acoustic source of the present utility model. The high-pitch waveguide 12 according to the present utility model is designed such that the high-pitch waveguide 12 has a Y-shape and includes two waveguide channels horizontally arranged for connecting with a plane wave sound source 14. The rectangular opening width W of the treble waveguide 12 is 18 mm, and the upper limit of the highest frequency of the operation of the treble waveguide 12 can be calculated to be 19KHz according to W is less than or equal to lambda. FIG. 3C shows that the waveguide designed and implemented in the present utility model has a planar wave-like no-acoustic interference propagation at a frequency of less than 19kHz.

As shown in fig. 4, fig. 4 is a cross-sectional view of the tweeter of the present utility model in a horizontal plane through the center of the waveguide. The utility model provides a high-pitch horn 16, which comprises a dual-source front-non-common-cavity horizontal coupling plane wave sound source waveguide 18 and two plane wave sound sources 14 arranged at the inlet end of a waveguide channel. The waveguide 18 is Y-shaped and comprises two horizontally arranged waveguide channels 20, the waveguide channels 20 are used for connecting a plane wave sound source 14, the waveguide channels 20 are composed of a first channel 22, a first reflecting surface 24, a second channel 26, a second reflecting surface 28 and a third channel 30 which are sequentially connected, and the first channel 22, the first reflecting surface 24, the second channel 26, the second reflecting surface 28 and the third channel 30 are rectangular right-angle surfaces.

As shown in fig. 4, in a horizontal cross-sectional view, the first channel 22 is formed by a first channel inner wall 32 and a first channel outer wall 34, the second channel 26 is formed by a second channel inner wall 36 and a second channel outer wall 38, the third channel 30 is formed by a third channel inner wall 40 and a third channel outer wall 42, the first channel inner wall 32, the first reflecting surface 24, the second channel inner wall 36 and the third channel inner wall 40 are sequentially connected to form an inner wall of the waveguide channel 20, and the first channel outer wall 34, the second channel outer wall 38, the second reflecting surface 28 and the third channel outer wall 42 are sequentially connected to form an outer wall of the waveguide channel 20.

As shown in fig. 4, in the horizontal cross-section, the first inner wall 32 and the first outer wall 34 are parallel to each other and have the same length, the second inner wall 36 and the second outer wall 38 are parallel to each other and have the same length, the first reflecting surface 24 and the second reflecting surface 28 are parallel to each other and have the same length, the third outer wall 42 is parallel to the first inner wall 32, the third inner wall 30 is in a zigzag shape, the inlet section of the third inner wall 30 is parallel to the third outer wall 42, the outlet section of the third inner wall 40 is connected to the inlet section of the third inner wall 40 at one end, and the outlet 44 of the third channel is connected to one end.

Alternatively, the inner wall of the third channel is linear, one end of the inner wall of the third channel is connected with the outlet end of the inner wall of the second channel, and the other end is connected with the outlet of the third channel.

As shown in fig. 5A, fig. 5A is a schematic diagram of the propagation path of the acoustic ray in the waveguide channel 20. The acoustic wave rays pass through the first channel 22, the first reflecting surface 24, the second channel 26, the second reflecting surface 28, and the third channel 30, and the acoustic wave rays of the acoustic wave rays passing through the first reflecting surface 24 and the second reflecting surface 28 conform to the law of reflection that the incident angle is equal to the reflection angle: θi1=θr1=θi2=θr2. The path difference (delta) of the sound wave passing through the waveguide channels is as follows: delta is less than or equal to lambda/4.

As shown in fig. 4, the waveguide 18 comprises a 3-piece housing. The first channel outer wall 34, the second channel outer wall 38, the second reflecting surface 28, and the third channel outer wall 42 are connected in sequence to form the outer walls of the waveguide channels 20, and the outer walls of the two waveguide channels 20 respectively form two outer shells. The first channel inner wall 32, the first reflecting surface 24, the second channel inner wall 36 and the third channel inner wall 40 are connected in sequence to form the inner walls of the waveguide channels 20, and the inner walls of the two waveguide channels 20 are connected to each other at the first reflecting surface 24 and the third channel opening 44 to form an inner shell.

As an improvement, an equally dividing grating (not shown) may be added in the waveguide channel 20, so as to improve the strength of the components, inhibit resonance caused by physical properties of materials under loud sound, reduce unnecessary diffraction of sound waves in the sound wave channel, improve the upper limit of effective high frequency, and reduce distortion.

The present utility model relates to an acoustic coupling waveguide. Based on geometric acoustic principle design, namely, the acoustic field based on ray theory. The utility model thus uses optically known relevant laws of physics equally well suited for the nature of sound propagation, such as law of reflection, the philosophy of the shortest time of the fermat, etc. The wave guide has several sections of acoustic wave channel slots in periscope structure, and the inside of the wave guide is composed of several sections of incident channel, reflecting surface and reflecting channel with obvious geometric characteristics.

As shown in fig. 4, the reflection path relationship of the acoustic wave channel in the waveguide channel 20 is shown in fig. 4, where point a is the center point on the emitting surface of the plane wave sound source 14, point B is the midpoint of the first reflecting surface 24, point C is the midpoint of the second reflecting surface 28, and point D is the midpoint of the waveguide outlet. Line AB represents the path of the incident path of the acoustic wave, i.e. the first path 22, line BC represents the path of the reflected path of the acoustic wave, i.e. the second path 26, and line CD represents the third path 30.

As shown in fig. 4, the acoustic wave propagates in the waveguide channel 20, and there are the following paths: (1) The sound wave is emitted from any point on the emitting surface of the plane wave sound source 14, along the path AB, and passes through the first channel 22; (2) The sound waves are reflected by the first reflecting surface 24, follow the path BC, and pass through the second channel 26; (3) The sound waves are reflected by the second reflecting surface 28 along the path CD through the third channel 30. Wherein the first reflecting surface 24 is parallel to the second reflecting surface 28, and accordingly, according to the basic principle of the law of reflection, (1) the normal BN of the first reflecting surface 24 is parallel to the normal CN of the second reflecting surface 28A; (2) The angle of incidence of the sound wave along path AB to the first reflecting surface 24 is equal to the angle of reflection of the sound wave along path BC; (3) The angle of incidence of the sound wave along path BC to the second reflecting surface 28 is equal to the angle of reflection of the sound wave along path CD. Thus, the acoustic wave propagates along paths AB, BC, CD, and is reflected twice by the first reflecting surface 24 and the second reflecting surface 28, forming a periscope-type reflecting system.

Accordingly, the acoustic wave is reflected by the plane wave acoustic source 14 from the emission surface into the path AB as a parallel ray, and the acoustic wave propagates along the path BC as a parallel ray, and is reflected by the second reflection surface 28, and the parallel ray is still maintained. Parallel acoustic rays have substantially no diffraction that adversely affects the acoustic transmission coupling. This is also an advantageous feature of the present utility model relative to other waveguide structures. Meanwhile, in the acoustic wave paths AB, BC, CD, the incident line AB, the reflected line BC, the reflected line CD, and the normal line all lie on the same plane, which is also one of the reflection law conditions.

The following is expressed according to the feima shortest time principle: the path of a ray (or an acoustic wave in the case of the present waveguide structure) at the time of propagation from one point to another will be the path that minimizes the propagation time. Under the conditions shown in fig. 4, the acoustic wave will select the path that minimizes the total propagation time from a to D. Assuming that the velocity of the acoustic wave in the medium is v, then the time t from A to B to C and finally to D is: t=ab/v+bc/v+cd/v= (ab+bc+cd)/v. This time will be at a minimum when AB and BC, CD meet the incident angle equal to the reflection angle, since the path of AB to BC, CD is shortest and the transmission attenuation of the sound wave is smallest given the fixed length of ab+bc+cd.

From the above, it is deduced that in the present utility model, the sound rays of the sound source from the emission surface a to the wave front D point are all transmitted along the shortest straight line path, in the present utility model, the time T from the emission surface a to the wave front D point is equal, and in the case of equal time T, the sound waves in the sound wave paths AB, BC, CD are all equal in phase, that is, are equal-phase equidistant cylindrical waves conforming to the line sound source.

In this embodiment, it is understood that the acoustic wave guide channel guides the acoustic source ray, and modifies the acoustic path, and the acoustic wave guide channel is not limited to the rectangular structure described above, and may also use other (reflective) surfaces. It will be appreciated that the waveguide channel reflecting surface may be flat, parabolic, hyperbolic or elliptical, or more generally flat, concave, convex, such as circular, parabolic, or in various configurations such as multi-channel, manifold, etc

The usable upper frequency accuracy of the waveguide is often a measure of the requirements of a successful design, especially for very short wavelength ultra-high frequencies. The waveguide acoustic channel slot design is in the frequency range where it must be effective, and the wavelength of the relevant operating frequency, limiting the width of the waveguide relevant acoustic channel and the overall height of the waveguide.

As shown in fig. 4, in the first waveguide path 20, there is the following geometric path relationship among the acoustic wave paths AB, BC, CD: (1) The first channel inner wall 32 and the first channel outer wall 34 are equal in length; (2) the first reflective surface 24 and the second reflective surface 28 are equal in length; (3) The second channel inner wall 36 and the second channel outer wall 38 are equal in length; (4) The difference between the length of the third channel inner wall 40 and the length of the third channel outer wall 42 needs to be less than the distance from the end of the third channel outer wall 42 to the end 44 of the third channel.

As shown in fig. 5B, fig. 5B is a schematic view of the outer wall of the waveguide channel 20 of the present utility model. The first channel outer wall 34, the second channel outer wall 38, the second reflecting surface 28, and the third channel outer wall 42 are connected in sequence to form an outer housing of the waveguide channel 20, the overall height of the outer housing being H. The following geometrical path relationships exist in the acoustic wave paths AB, BC, CD: l=ln, where l=ab+bc+cd is the total length of the path from the point a of the sound source emission surface of the waveguide to the point D of the waveguide exit, and L n =ab n+bc n+cd n is the total length of the path from any point a of the sound source emission surface of the waveguide to any point D of the height H of the waveguide exit. The path difference (δ) of the sound wave passing through the first waveguide channel is the difference between any two lns, and when l=ln, each path has equal length, and the path difference (δ) is zero.

As shown in fig. 4, according to the operation parameters of the plane wave sound source 14, the following design may be made according to the acoustic relationship. (1) From the highest available frequency wavelength λ of the waveguide design target, the total width W of the rectangular planar output port at the waveguide exit end can be calculated, where w1+w2=λ=w, W1, W2 are the waveguide left-side exit width and the waveguide right-side exit width, respectively. For example, the highest available frequency of the waveguide design target is 20KHz, and the sound propagation speed is 343.2m/s, and the corresponding highest available frequency wavelength lambda is equal to 17.16 mm. Correspondingly, the total width W of the rectangular planar output port at the outlet end of the waveguide is equal to 17.16 mm, and if the highest available frequencies of the corresponding tweeter drivers of the two waveguide channels are identical, w1=w2=8.58 mm. (2) From the design target highest available frequency wavelengths λ3 and λ4 on the left and right sides of the waveguide, the width W3 of the waveguide left side reflection channel 26 and the width W4 of the waveguide right side reflection channel 26 can be calculated, where w3=λ3, w4=λ4. For example, the wave guide left and right sides are designed with the highest available frequency wavelength lambda 3 and lambda 4 equal to 20KHz, and the sound propagation speed is 343.2m/s, then the corresponding highest available frequency wavelength lambda 3 and lambda 4 is equal to 17.16 millimeters. Correspondingly, w3=w4=17.16 mm. If the design target highest available frequency wavelengths λ3 and λ4 are not equal on the left and right sides of the waveguide can be designed according to the specific acoustic application requirements, then it is necessary to calculate W3 and W4 separately.

As shown in FIG. 5B, the total height H of the rectangular planar output port at the exit end of the waveguide can be calculated from the waveguide design target lowest available frequency wavelength λ5, where H+.lamda.5/2. For example, the lowest available frequency of the waveguide design target is 800Hz, and the sound propagation speed is 343.2m/s, the corresponding lowest available frequency wavelength lambda is equal to 429 mm. Correspondingly, the total height H of the rectangular planar output port at the outlet end of the waveguide according to H is equal to or greater than lambda 5/2 is equal to 214.5 mm.

As shown in fig. 4, the width of W1, W2 is corrected by the third channel 30. Wherein: w1=w3/2, w2=w4/2. Wherein, on the horizontal plane passing through the center of the waveguide, the first channel inner wall 32 is parallel to the third channel outer wall 42, the third channel 30 inner wall 40 is in a fold line shape, the inlet section of the third channel 30 inner wall 40 is parallel to the third channel 30 outer wall 42, one end of the outlet section of the third channel 30 inner wall 40 is connected with the inlet section of the third channel 30 inner wall 40, and one end is connected with the outlet 44 of the third channel 30. Alternatively, the inner wall 40 of the third channel 30 may be rectilinear, with one end connected to the inner wall 36 of the second channel and one end connected to the outlet 44 of the third channel 30.

As shown in fig. 4, in cylindrical mode propagation, the axis of the cylinder is vertical, so that the output rectangle is an equiphase plane, the following condition needs to be satisfied: (1) W3=w4+.w1+w2+.w when the two treble drivers 14A or 14B are operating in the same frequency band. (2) w1+w2=w when the two sound sources operate in different frequency bands.

As shown in fig. 5B, δ is the maximum length deviation between acoustic paths of the usable frequencies of the waveguide design target, i.e., the path difference over L from any a point to any D point of the acoustic wave emitting surface, and for effective coupling, δ needs to be less than a quarter of the usable frequency of the highest design target, i.e.: delta is less than or equal to lambda/4.

As shown in fig. 5B, in order for the propagation to be effectively cylindrical along the vertical axis, it is necessary to make H greater than λ5.

As shown in fig. 4, α1 < α2 < α3, where α1 is the angle between the first reflective surfaces 24.α2 is the angle between the second channel inner walls 36. α3 is the angle of the third channel inner wall 40 at the end 44.

According to one embodiment of the utility model, the highest available frequency wavelength λ=18 kHz, and correspondingly, w=18 mm, two identical sound sources 20 are chosen, w1=9mm, w2=9mm, w3=18 mm, w4=18 mm.

As shown in fig. 4, the first reflecting surface 24 is parallel to the second reflecting surface 28, so that the incident angle and the reflecting angle of the two reflections can be selected to be 45 °, and a periscope type reflecting system is formed.

As shown in fig. 5B, the physical path length l=210 mm of the horizontal center section from the sound source emitting surface a to the wave front output D', and the physical path length ln=210 mm of any point on the physical path from the sound source emitting surface a to the wave front output Dn satisfy the requirement of equidistant propagation of sound waves.

As shown in fig. 5B, the waveguide design target lowest available frequency wavelength λ5 is selected, and the total height h=210 mm of the rectangular planar output port at the waveguide exit end corresponds to the waveguide design target lowest available frequency around 800 Hz.

It should be understood that these dimensions are not limiting, but simply give examples of implementing the utility model by way of example.

As can be seen from the horizontal cross-section of the loudspeaker 45 using the horn design of the present utility model, in the box 46, the horn 16 of the present utility model is centered, wherein the cross-section of the waveguide 18 shows a periscope structure of two waveguide channels on the left and right, and two mid-bass units 48 are mounted on the panel 50 in a horizontally symmetric arrangement on the left and right.

As shown in fig. 6B, the acoustic wave channel of the hollow periscope structure between the third channel inner wall end 44 and the third channel outer wall, and the acoustic wave output slot 54, i.e., the wave front outlet, formed by the rectangular cutout 52 of the panel 50 can be seen from a frontal view of the housing 46.

The technical advantages of the present utility model may be demonstrated by comparison with the prior art.

U.S. patent No. 20110085692A1 discloses a dual diaphragm driver, the wave front of which is shown in the figure of the patent, wherein two annular planar diaphragms, and two diaphragms with the same diameter and size simultaneously work in the same frequency band and are coupled out through a common cavity.

U.S. patent No. 20130243232A1 discloses a dual-diaphragm driver with waveguide output, wherein two diaphragms can be of the same diameter size or of different diameter sizes, and diaphragm sound waves are coupled out through a co-cavity wavefront.

The implementation of the two schemes above translates into a product with the end result: (1) The two diaphragms work in the same frequency band, the maximum sound pressure level is increased by 6dB (the calculation formula is L_max=L+20 log20 (n) L represents the sound pressure level of a single sound box, n represents the number of drivers), and the effective working frequency band is 800Hz-20KHz; (2) The two diaphragms work in different frequency bands (the expansion working frequency band can reach 300Hz-20 KHz), the effective usable frequency band of the small-size diaphragm is 3KHz-20KHz, and the minimum effective usable frequency band of the large-size diaphragm is 300Hz-6KHz.

The two utility models have the advantage of relatively small structure. Since acoustic waves are mechanical waves that propagate through the mechanical vibrations of molecules and particles in a medium. They propagate in the form of longitudinal waves, transmitting energy through interactions between molecules. The sound wave causes a pressure change of the air when propagating in the air. When the sound source vibrates, it produces continuous compression and sparse vibrations, forming sound waves. These vibrations may cause movement of air molecules, resulting in a change in the pressure in the air. In air propagation, the vibration of the sound source causes compression and rarefaction of surrounding air molecules. When the sound source vibrates outwards, it pushes air molecules together, forming a compressed area, increasing pressure. When the sound source vibrates inwards, the sound source pulls air molecules apart to form a sparse area, and the pressure intensity is reduced. This periodic pressure variation is transmitted along the direction of propagation of the acoustic wave.

As can be seen from the two patent structures, the diaphragms are all co-cavity and work simultaneously, and wavefront coupling is completed in the cavity. When the driver is operated at high power, its cavity pressure changes with time, causing a change in acoustic resistance, and thus nonlinear distortion, especially at high power and its significance. The diaphragm has the physical characteristics that the diaphragm has thin diaphragm thickness and good high-frequency response transient state, and nonlinear distortion is easy to be caused under the condition that the diaphragm material has insufficient rigidity and high power. The medium frequency response of the thick diaphragm is good, but the high frequency efficiency is low, and the attenuation of the high frequency 8KHz-20KHz part is serious, which reaches about 10 dB. When the diaphragms work singly, the pressure in the cavity is P, when the two diaphragms work, the pressure is doubled to 2P, and in this case, only the thickness of the diaphragm is selected to thicken the diaphragm, so that the distortion problem caused by the pressure of 2 times in the cavity is solved, and the problem caused by thickening the diaphragm is high-frequency low efficiency.

As shown in FIG. 7, the mass production driver in the patent US20110085692A1 is a comparison graph of test curves under the same test condition as that of the implementation waveguide of the utility model, wherein the mass production driver curve (marked A at the curve turning position) in the patent US20110085692A1 is compared with the waveguide curve (marked B at the curve turning position) of the implementation waveguide of the utility model, the efficiency of the patent US20110085692A1 is higher in the frequency range of 500Hz-5KHz, the attenuation of the high-frequency 4KHz-20KHz part (marked by F frame) is serious, and about 10dB is reached, which is unfavorable for the application in line array sound expansion, and the attenuation of the long-distance sound expansion air is mainly in the high frequency range of 4KHz-20 KHz. C

Similarly, the data sheet published by the compression drive waveguide of one embodiment of patent US20130243232A1 shows that its high frequency diaphragm size is 1.75 "(44.4 mm), medium and high frequency diaphragm size is 3.5" (90 mm), operating frequency range: 400Hz-22000Hz, when the two diaphragms work together, the high-frequency diaphragm size 1.75 'is at the same pressure of the medium-high frequency diaphragm size 3.5' (90 mm), but the thickness of the diaphragms is different, thereby causing high-frequency distortion, and the larger the power is, the larger the nonlinear distortion is.

The utility model achieves the same aim of the two patents by the following 2 methods:

(1) The method for expanding sound pressure level by two plane wave sound sources working in the same frequency band increases the maximum sound pressure level by 6dB (the calculation formula is L_max=L+20log 20 (n) L represents the sound pressure level of a single plane wave sound source, n represents the number of high-pitch drivers), and the effective working frequency band is 800Hz-20KHz;

(2) The method for expanding the bandwidth of two plane wave sound sources working in different frequency bands (the expansion working frequency band can reach 300Hz-20 KHz), the effective usable frequency band of the small-size vibrating diaphragm is 3KHz-20KHz, and the minimum effective usable frequency band of the large-size vibrating diaphragm is 300Hz-6 KHz. The utility model solves the distortion problem caused by the physical defect of the hardware by a method that two plane wave sound sources do not share the cavity wave front coupling, and has the following advantages in application design:

(1) The two plane wave sound sources of the method are compatible with any high-pitch driver which is produced in mass in the current industry, including a traditional high-pitch compression driver and a belt-type high-pitch driver. And both patents or similar patents cannot be realized due to physical structures or technical characteristics.

(2) The implementation of the two patents is a product of the technology, and has the inherent technical characteristics or sound styles, and in the implementation method of the utility model, two plane wave sound sources can be designed and matched by mass production drivers of different manufacturers, so that different sound styles and products can be obtained. The design of the waveguide enables the loudspeaker box to be matched with different treble drivers, so that different sound styles and products are obtained.

(3) According to the scheme of the utility model, two different plane wave sound sources are implemented and work in different frequency bands, so that the frequency response can be expanded. The two plane wave sound source frequency bands have wider frequency width in the overlapped area because of the wave front non-sharing cavity structure, thereby being beneficial to the flexible frequency division design of research and development engineers. In the prior art, the overlapping area frequency response curve peak Gu Jiaoduo has narrow frequency division point selection limitation, and is not beneficial to the flexible design and application of research personnel.

The waveguide of the present utility model is completed with materials such as metal, ABS plastic, carbon fiber, resin, etc. through a mold. As shown in fig. 4, the waveguide 18 comprises a 3-piece housing. The first channel outer wall 34, the second channel outer wall 38, the second reflecting surface 28, and the third channel outer wall 42 are connected in sequence to form the outer walls of the waveguide channels 20, and the outer walls of the two waveguide channels 20 respectively form two outer shells. The first channel inner wall 32, the first reflecting surface 24, the second channel inner wall 36 and the third channel inner wall 40 are connected in sequence to form the inner walls of the waveguide channels 20, and the inner walls of the two waveguide channels 20 are connected to each other at the first reflecting surface 24 and the third channel opening 44 to form an inner shell. The space between the outer and inner housings constitutes the acoustic path of the waveguide 18 and the outer housing may further comprise flanges for securing the plane wave acoustic source 14. These components may be assembled by gluing, heat welding or screws, ultrasonic welding, etc.

The wave guide of the present utility model has internal geometric features shaped such that the shortest paths from the plane wave sound source emitting surface to the output rectangular plane wave are all or nearly equal in length. In waveguide design application, the propagation time of sound wave through periscope type reflected sound wave channel groove is constant phase, the inside of the wave channel groove is the shortest path, and the phenomenon that sound wave transmission is not favored, such as sound wave simulating, is avoided.

Due to the problem of mould production error accuracy, the plane wave fronts from the point A to the point D of the sound source emission surface allow the path difference (delta) between the sound wave paths to be as follows: delta is less than or equal to lambda/4, (lambda is the wavelength of the highest available frequency of the design target), i.e., the path difference is less than or equal to one quarter wavelength of the highest operating frequency.

Thus, the waveguide of the present utility model can couple cylindrical waves of two identical or different plane wave sound sources in a horizontal position wave front, and the two cylindrical wave horizontal position wave front couplings propagate in the form of cylindrical waves.

Fig. 8A, fig. 8B, fig. 9A, fig. 9B are 3D directivity patterns of the prior art waveguide tested under the same conditions as the prior art waveguide, wherein fig. 8A is a horizontal 3D directivity pattern of the prior art waveguide and fig. 8B is a vertical 3D directivity pattern of the prior art waveguide. Fig. 9A is a horizontal 3D pointing view of a waveguide according to an embodiment of the present utility model, and fig. 9B is a vertical 3D pointing view of a waveguide according to an embodiment of the present utility model. From the comparison of fig. 8A and fig. 9A, it can be found that the waveguide of the present utility model is substantially consistent compared with the prior art waveguide horizontal 3D directivity pattern, and the directivity is more uniform around 16KHZ, which means that the waveguide reaches the design target usable frequency, and the accuracy is higher than that of the prior art. From the comparison of fig. 8B and fig. 9B, it can be found that the result of the waveguide of the present utility model is substantially consistent compared with the vertical 3D directivity pattern of the waveguide of the prior art, the higher the frequency, the narrower the directivity, and no other side lobes, and the direction characteristics of the linear sound source are met.

As shown in fig. 10, the sound pressure level curves are obtained by testing the same voltage and the same condition of the same 110 ° directivity control horn using the same driving unit. It can be seen that the sound pressure level curve a (identified by the a frame) in the figure is about 6dB higher overall than the waveguide curve B (identified by the B frame) of the prior art, and that the lower end usable frequency is lower to 800HZ, the prior art waveguide being cut off at about 1 KHZ. The technical advantage corresponds to another object of the utility model, namely, the method for increasing the sound pressure level output is provided, a plurality of driver wave fronts which work at the same time and have the same frequency are not coupled in a common cavity in the sound box, and compared with the wave guide maximum sound pressure level of the vertical coupling of a single driver in the prior art in the current industry, the method can increase by more than or equal to 6dB.

As shown in fig. 11A and 11B, fig. 11A and 11B are graphs of frequency response of the present utility model operating at the same frequency band using two identical drivers. As shown in the figure, the B curve (indicated by the B frame) is a frequency response curve when a single driver operates, the a curve (indicated by the a frame) is a coupling curve when both the left and right drivers operate simultaneously, and the C curve (indicated by the C frame) is a phase curve. The Sound Pressure Level (SPL) is calculated as: l_max=l+20 log20 (N), N representing the number of sound source drivers. When the two drivers work simultaneously, the curves are perfectly overlapped by 6dB, and the phase curves C are completely consistent. The two treble drivers reach wavefront coupling without any acoustic interference as shown by the test results. This technical advantage corresponds to another object of the present utility model, namely to provide a waveguide that allows a plurality of treble drivers operating in the same frequency range to generate common wavefront coupling in a horizontal position with the same wavefront not sharing a cavity, but with almost zero acoustic interference.

As shown in fig. 12A and 12B, fig. 12A and 12B are graphs of frequency response of the present utility model operating at different frequency bands using two different high-pitch drivers. As shown in the figure, the treble driver A (marked by a frame A curve) and the intermediate frequency compression driver B (marked by a frame B curve) are basically approximately consistent in the trend of the phase C (marked by a frame C), the high frequency driver A can use the frequency range of 1KHz-18KHz, and the intermediate frequency compression driver B can use the frequency range of 300Hz-9KHz. As shown by the overlap region F (identified by the F box) in the figure, the two driver division points are selected over a wide range, and division is more flexible for the designer. This technical advantage corresponds to another object of the present utility model, namely to provide a waveguide that allows a plurality of driver sound sources operating in different frequency ranges to be coupled in common in the same wavefront in a horizontal position without co-cavity and with almost zero acoustic interference.

Fig. 13A is a schematic diagram of a vertical array of acoustic enclosure assembly designed for use with a waveguide according to the present utility model, and fig. 13B and 13C are diagrams of coupling of waveguides of the present utility model in a vertical array of acoustic enclosure assembly. As shown in fig. 13A, 3 speakers 45 are vertically stacked to form a speaker vertical array assembly 56. As shown in fig. 13B and 13C, the 3 sets of horn 16, including the plane wave sound source 14 and the waveguide channel 20, have no interference coupling of the cylindrical waves when the sound boxes are vertically stacked. This technical advantage, which corresponds to another object of the present utility model, is to provide a waveguide that produces one or more wave fronts in one or more frequency ranges within the enclosure that couple sound waves of the same frequency range in adjacent enclosures vertically stacked in a line array and that are silent with respect to optical interference.

Fig. 14 is a schematic diagram of a multi-plane wave sound source horizontal array scheme using the tweeter horn of the present utility model through a multi-stage waveguide. A plane wave acoustic source horizontal array 58 comprises a dual source front non-co-cavity horizontally coupled plane wave acoustic source waveguide 60 as described above and a tweeter 16 as described above mounted at the inlet end of the waveguide channel. Still further, the present utility model provides a multistage plane wave acoustic source horizontal array 62 comprising a dual source front non-co-cavity horizontally coupled plane wave acoustic source waveguide 64 as described above, and a plane wave acoustic source horizontal array 58 as described above mounted at the inlet end of the waveguide channel.

As shown in fig. 14, with the tweeter 16 according to the present utility model as a basic unit, the two tweeters 16 according to the present utility model can be coupled without wavefront sharing, that is, by adding the primary waveguide 60, the two tweeters 16 are coupled, that is, the 4 plane wave sound sources 14 are coupled, through the waveguide according to the present utility model. By adding the secondary waveguide 64, the number of the tweeter 16 and the plane wave sound source 14 can be multiplied to participate in coupling.

The number of the combination of the plurality of plane wave sound source arrays at the sound source level is as follows:

(1) The sound source driver increases in an equal proportional relationship which can be expressed by the following expression:

{ a, ar, ar 2, ar 3,.. } ar n, where a is the first term of the equipotential series, r is the public ratio (the ratio of the two adjacent terms), and n is the number of terms. In the implementation of the present application, the sound source driver is added with the following equal proportion relation (the public ratio is 2): 2,4,8,16,32,64,128 … … can theoretically be combined into an infinite array of horizontal positions as the spatial positions allow.

(2) The sound pressure level after the horizontal array combination has the following relation: the sound pressure level increases in an arithmetic progression relationship according to the calculation formula l_max=l+20×log20 (n), where L represents the sound pressure level of a single sound source driver and n represents the number of sound source drivers. The number of sound sources is doubled, the sound pressure level is increased by 6dB, and the tolerance=6 is calculated. In this embodiment, the sound pressure level increases in an arithmetic progression relationship, and the arithmetic progression relationship can be expressed by the following expression: { a, a+d, a+2d, a+3d,... In this embodiment, the equal proportion relation increment value when the sound source driver implements the horizontal array is: the peak maximum sound pressure level of the current mass-produced drivers of 2,4,8,16,32,64,128 … … can be 161dB, and the sound pressure levels are respectively as follows according to a=161 d=6: (167,173,179,185,191,197,203) dB

The embodiment is mainly used in the following special fields and applications: (1) military applications: in the military field, sound amplifying devices with sound pressure levels greater than 160dB may be used to simulate noise in battlefield environments such as explosion sounds, gunsounds, and the like. This is important for military training, simulation, and testing and evaluation of weapon systems. (2) 2. Aerospace field: in the aerospace field, sound amplifying equipment with a sound pressure level greater than 160dB can be used for simulating rocket launching, jet engine noise and other environments with extremely high sound pressure levels. This is critical to the design, testing and evaluation of aerospace vehicles. (3) scientific research: in the scientific research field, the sound amplifying equipment with the sound pressure level larger than 160dB can be used for acoustic experiments, material research, seismic simulation and the like. These experiments typically require extremely high sound pressure levels to simulate a particular environment or phenomenon. (4) early warning, sonic weapon field: in the field of early warning and acoustic weapons, the sound amplifying equipment with the sound pressure level larger than 160dB can be used for disaster early warning systems such as explosion-proof anti-terrorism expelling, acoustic directional amplifying and interference, tsunami, earthquake and the like; the marine shouting equipment is used for expelling birds and birds from airport aircrafts, carrier-based military aircrafts and the like.

Claims

1. The utility model provides a do not share chamber horizontal coupling plane wave sound source waveguide before dual sound source wave, its characterized in that, the waveguide is Y shape, including being two waveguide channels that the level set up, waveguide channel is used for connecting plane wave sound source, waveguide channel comprises the first passageway that connects gradually, first reflecting surface, second passageway, second reflecting surface, and third passageway, first reflecting surface, second passageway, second reflecting surface, and third passageway are right angle rectangle face.

2. The dual source front-not-common-cavity horizontally coupled planar wave acoustic source waveguide according to claim 1, wherein the first channel is composed of a first channel inner wall and a first channel outer wall in a horizontal sectional view, the second channel is composed of a second channel inner wall and a second channel outer wall, the third channel is composed of a third channel inner wall and a third channel outer wall, the first channel inner wall, the first reflecting surface, the second channel inner wall and the third channel inner wall are sequentially connected to form an inner wall of the waveguide channel, the first channel outer wall, the second reflecting surface and the third channel outer wall are sequentially connected to form an outer wall of the waveguide channel.

3. The dual-source front-not-common-cavity horizontal coupling plane wave sound source waveguide according to claim 2, wherein the first channel inner wall and the first channel outer wall are parallel to each other and have the same length in a horizontal sectional view, the second channel inner wall and the second channel outer wall are parallel to each other and have the same length, the first reflecting surface and the second reflecting surface are parallel to each other and have the same length, the third channel outer wall is parallel to the first channel inner wall, the third channel inner wall is in a zigzag shape, an inlet section of the third channel inner wall is parallel to the third channel outer wall, an outlet section of the third channel inner wall is connected with an inlet section of the third channel inner wall at one end, and an outlet of the third channel is connected with one end.

4. The dual-source front-wave non-common-cavity horizontal coupling plane wave acoustic source waveguide according to claim 2, wherein the first channel inner wall and the first channel outer wall are parallel to each other and equal in length, the second channel inner wall and the second channel outer wall are parallel to each other and equal in length, the first reflecting surface and the second reflecting surface are parallel to each other and equal in length, the third channel outer wall is parallel to the first channel inner wall, the third channel inner wall is in a straight line shape, one end of the third channel inner wall is connected with the outlet end of the second channel inner wall, and one end is connected with the outlet of the third channel.

5. The dual source front non-co-cavity horizontally coupled planar wave acoustic source waveguide of claim 1 wherein the acoustic rays pass through the first channel, the first reflecting surface, the second channel, the second reflecting surface, and the third channel, and wherein the acoustic rays pass through the first reflecting surface and the second reflecting surface are such that they satisfy the law of reflection that the incident angle is equal to the reflection angle: θi1=θr1=θi2=θr2, and the path difference δ between the sound waves passing through the waveguide channels is: delta is less than or equal to lambda/4.

6. A tweeter comprising a dual source front-of-wave non-co-cavity horizontally coupled plane wave acoustic source waveguide according to claim 1, and two plane wave acoustic sources mounted at the entrance end of the waveguide channel.

7. A sound box comprising a tweeter according to claim 6, two mid-bass drivers arranged horizontally symmetrically on both sides of the tweeter, and a box body.

8. A horizontal array of plane wave sound sources characterized by comprising a dual source front non-co-cavity horizontally coupled plane wave sound source waveguide according to claim 1 and a tweeter according to claim 6 mounted at the entrance end of the waveguide channel.

9. A multistage plane wave acoustic source horizontal array comprising a dual source front non-co-cavity horizontally coupled plane wave acoustic source waveguide according to claim 1 and a plane wave acoustic source horizontal array according to claim 8 mounted at the entrance end of the waveguide channel.