Microphone windshield structure for harsh outdoor environments

Abstract

The present invention proposes a microphone windshield structure for outdoor harsh environments, and belongs to the field of microphone windshield structure design. It solves the problem of outdoor use of microphones in multiple fields such as battlefields and civilian use. The microphone windshield structure includes an outer shell and an internal central cavity. The side wall of the outer shell is provided with a plurality of slit openings. The inner shell is provided with a plurality of rotationally symmetrical structural units. The inner central cavity is a circular or spherical area for placing a microphone sensor. A pleated channel is provided in the rotationally symmetrical structural unit. The starting end opening of the channel faces the inner central cavity, and the end of the channel is a slit opening of the side wall of the outer shell. The present invention can ensure that while suppressing wind-induced noise, the windshield will not cause propagation attenuation of the acoustic signal. In addition, the hard windshield structure can provide good protection for the acoustic sensor inside it, such as anti-collision, rainproof and fireproof, and is particularly suitable for use in outdoor environments.

Description

Technical Field

[0001] The invention belongs to the field of microphone windshield structure design, and in particular relates to a microphone windshield structure suitable for working in harsh outdoor environments. Background Art

[0002] Wind noise interference is a more difficult problem for microphones working outdoors. When strong winds act on the microphone, the airflow will generate random pressure on the surface of the microphone's acoustic sensor, which will cause a lot of noise (wind noise) to be mixed in the microphone output signal. In severe cases, the acoustic detection signal will even be completely submerged in the wind noise, which will cause the microphone to be unable to work normally in harsh outdoor environments.

[0003] At present, porous sponge materials are usually used in the market to make microphone windshields, but these products have poor moisture resistance, anti-collision and fire resistance, which makes them unable to be used for a long time in harsh outdoor environments. On the other hand, although microphone windshields made of hard materials can better solve the problems of rain protection, anti-collision and temperature resistance in outdoor working environments, the hard materials form baffles or closed cavity structures, which will lead to the obstruction of acoustic signals and thus cause serious signal attenuation. It is worth noting that many platforms such as vehicles, helicopters and unmanned aerial vehicles used by troops in developed countries are beginning to be equipped with advanced acoustic detection systems to enhance battlefield situational awareness. In multiple application scenarios such as field operations and battlefields, the microphone array system in acoustic detection equipment is often unable to be used or even damaged in harsh environments such as wind and rain outdoors due to the failure of the windshield. Therefore, there is an urgent need to develop microphone windshield products that can be suitable for harsh outdoor environments, which can effectively solve the problem of outdoor use of microphones in battlefields and civilian fields. Summary of the invention

[0004] In view of this, the present invention aims to propose a microphone wind noise reduction hard windshield structure for outdoor harsh environments, which can ensure that the windshield will not cause the propagation attenuation of the acoustic signal while suppressing the wind-induced noise. In addition, the hard windshield structure can provide good protection for the acoustic sensor inside it, such as anti-collision, rainproof and fireproof, and is particularly suitable for use in outdoor environments.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a microphone windshield structure for use in harsh outdoor environments, the microphone windshield structure comprising an outer shell and an internal central cavity, the side wall of the outer shell is provided with a plurality of slit openings, the interior of the outer shell is provided with a plurality of rotationally symmetrical structural units, the internal central cavity is a circular or spherical area for placing a microphone sensor, a pleated channel is provided in the rotationally symmetrical structural unit, the starting end of the channel is opened facing the internal central cavity, and the end of the channel is a slit opening of the side wall of the outer shell.

[0006] Furthermore, 2 to 16 rotationally symmetrical structural units are arranged inside the shell.

[0007] Furthermore, the wall thickness of the rotationally symmetrical structural unit is t=0.5 mm to 5 mm, and the width of the pleated channel in the rotationally symmetrical structural unit is g=0.1 mm to 5 mm.

[0008] Furthermore, the outer radius of the shell is R=10mm-50mm, and the radius of the inner central cavity is r=2mm-30mm.

[0009] Furthermore, the height H of the shell is 10 mm to 100 mm.

[0010] Furthermore, the shell is made by 3D printing of hard materials or by metal machining.

[0011] Furthermore, the inner central cavity is filled with porous materials to further optimize the wind noise reduction effect, and the porous materials include polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foam or glass fiber materials.

[0012] Furthermore, porous materials are filled in the pleated channels of the rotationally symmetrical structural units to further enhance the wind noise reduction effect, and the porous materials include polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foams or glass fiber materials.

[0013] Furthermore, a porous material is coated on the outside of the shell to further enhance the wind noise reduction effect, and the porous material includes a polyurethane porous material, a metal porous material, a sponge material, a wood fiber material, a polymer foam or a glass fiber material.

[0014] Furthermore, the shape of the shell is a cylindrical shell, a spherical shell, a polyhedral shell or a disc-shaped shell.

[0015] The microphone windshield structure proposed in the present invention can effectively solve the problem of wind noise when the microphone is working in harsh outdoor environments, and has functions such as rainproof, anti-collision, and fireproof, which significantly improves the applicability of the microphone in harsh outdoor environments. The microphone windshield described in the present invention adopts a narrow pleated channel structure, which can effectively increase the propagation path of the wind flow from the windshield shell to the internal cavity microphone, and the wind is attenuated and dissipated as heat energy through the viscosity of the pleated channel, thereby significantly suppressing the generation of wind noise and effectively eliminating the interference of wind noise on the microphone. In addition, since the entire microphone windshield is made of hard materials, compared with the traditional porous sponge windshield, the present invention has better pressure resistance, moisture resistance and drop resistance, which greatly improves the reliability of the microphone in harsh environments.

[0016] Compared with the prior art, the microphone windshield structure for outdoor harsh environments described in the present invention has the following advantages:

[0017] (1) When collecting sound signals outdoors, the present invention can significantly reduce the impact of wind noise on the microphone, thereby improving the microphone's ability to pick up sound signals in harsh environments.

[0018] (2) The microphone windshield structure of the present invention can protect the acoustic sensor inside it from rain and collision without causing significant attenuation of the acoustic signal.

[0019] (3) The microphone windshield structure of the present invention can be made by 3D printing technology or mechanical processing, and has the advantages of low cost, high precision, and mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a typical application scenario of the microphone windshield for outdoor harsh environments described in the present invention, which is used in a vehicle-mounted acoustic detection system (microphone array) to improve the environmental adaptability and working stability of the equipment.

[0022] Figure 2 It is a three-dimensional schematic diagram of the microphone windshield structure of the present invention.

[0023] Figure 3 It is a front view of the microphone windshield structure described in the present invention.

[0024] Figure 4 It is a cross-sectional view of the microphone windshield structure described in the present invention.

[0025] Figure 5 is a schematic diagram of a three-dimensional structure of a connection terminal for connecting a microphone to the windshield structure of the present invention, wherein Figure 5 (a) is a three-dimensional schematic diagram of the connection terminal. Figure 5 (b) is a schematic diagram showing the connection between the connecting terminal and the wind shield structure when in use; in the figure: 3-connecting terminal, 4-wind shield shell.

[0026] Figure 6 yes Figure 5 Front view of the structure.

[0027] Figure 7 yes Figure 5 Top view of the structure.

[0028] Figure 8 It is the flow field distribution diagram around the microphone in the wind flow field and the simulation calculation result of the surface wind load when there is / is not a wind shield structure as described in the present invention, wherein: Figure 8 (a) and (b) show the wind velocity distribution around the microphone (orange-yellow rectangular area) when there is a wind shield structure; (c) shows the wind velocity distribution around the microphone when there is no wind shield structure; (d) shows the wind pressure load distribution on the microphone surface with / without a wind shield structure.

[0029] Fig. 9 According to some embodiments of the present invention, the time domain waveforms of wind noise signals collected by the microphone are compared when there is a wind shield structure and when there is no wind shield structure.

[0030] Fig.10 Yes Fig. 9 After the wind noise time domain signal is converted to the frequency domain, the wind noise power spectrum of the microphone with and without the windscreen structure is compared.

[0031] Fig.11 According to some embodiments of the present invention, the amplitude-frequency response characteristics of the acoustic signal of the microphone with and without the windshield structure are compared.

[0032] Fig.12 According to some embodiments of the present invention, an experimental analysis is performed to compare the time domain waveforms of wind noise collected by microphones in a windshield structure with pleated channels of different widths with that in a case without a windshield structure.

[0033] Fig.13 Yes Fig.12 The wind noise power spectrum comparison is shown after the wind noise time domain signal is converted to the frequency domain.

[0034] Fig.14 is a schematic diagram of a composite windshield structure combined with different filling materials and covering materials according to some embodiments of the present invention, wherein Fig.14(a) shows the insertion of filler material in the pleated channel area of ​​the windshield structure (grey shaded area); Fig.14 (b) means that the filling material is embedded in the inner cavity area of ​​the windshield structure; Fig.14 (c) indicates that filling material is embedded in both the inner cavity and the pleated channel of the windshield structure; Fig.14 (d) Indicates that the outer surface of the windshield structure is covered with a covering material; Fig.14 (e) indicates that while the outer part of the windshield structure is covered with a covering material, a filling material is also embedded in the inner cavity and the pleated channel of the windshield structure. In the figure: 1 - microphone, 2 - porous material.

[0035] Fig.15 There are several different windshield structural shell shape designs, including (a) a cylindrical windshield shell, (b) a rectangular windshield shell, (c) a conical windshield shell, and (d) a disc-shaped windshield shell; the internal structures of these windshields of different shapes include the pleated channel area and the inner cavity area mentioned above.

[0036] Fig.16 This is a test of the present invention under a simulated rainy day environment. Fig.16 (a) is a schematic diagram of the simulation experiment. Fig.16 (b) is the microphone acoustic signal response inside the windproof structure with and without rain. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] See the instruction manual Figures 1 to 16 The present embodiment is described as a microphone windshield structure for outdoor harsh environments, the microphone windshield structure comprising an outer shell and an inner cavity. The side wall of the outer shell is provided with a plurality of slit openings, the inner shell is provided with a plurality of rotationally symmetrical regions, the center of the figure formed by the plurality of rotationally symmetrical regions is a circle, the circular region is the inner cavity, each rotationally symmetrical region is provided with a pleated channel, the start end of the channel is opened facing the inner cavity, the end of the channel is connected to the slit opening of the side wall of the outer shell of the windshield, and the microphone is placed in the middle inner cavity of the windshield.

[0039] The functions of the microphone windshield structure are as follows: the windshield structure is a hard shell with a pleated channel, which can suppress and dissipate wind noise through the narrow pleated channel design, thereby improving the signal-to-noise ratio of the microphone in an outdoor windy environment. At the same time, unlike the traditional porous sponge windshield, the hard shell windshield structure proposed in the present invention will not attenuate the sound wave signal in its working frequency band. In addition, the design of the hard shell has good anti-collision and rain-proof effects, so that the microphone can work normally in harsh environments such as wind and rain after installing the windshield structure of the present invention.

[0040] The windshield structure of the present invention is designed as follows: the windshield is composed of a hard outer shell, an internal pleated channel area and an internal central cavity area. A small microphone can be embedded in the internal cavity to receive sound wave signals. Furthermore, through the design of a narrow pleated channel, the propagation of wind can be effectively hindered. The long transmission distance of wind in the pleated channel and the viscous dissipation effect of the channel wall on the wind can effectively suppress the interference of airflow on the microphone inside the windshield, thereby significantly reducing the impact of wind noise on the microphone. The pleated channel area of ​​the windshield structure can be divided into m=2~16 sector areas according to different angles, the wall thickness of the sector area is t=0.5mm~5mm, the radius of the windshield outer shell is R=5mm~50mm, the radius of the internal cavity is r=2mm~30mm, and the overall height of the windshield is H=10mm~100mm.

[0041] The usage of the windshield structure is limited as follows: a small microphone is placed in the central cavity inside the windshield, which serves as an acoustic-to-electric conversion device for converting sound wave signals into electrical signals.

[0042] Definition of the connection method of the windshield structure: In order to place the miniature microphone inside the windshield structure, an opening is left at the top of the windshield structure. The present invention uses a connection terminal to ensure the airtightness of the opening, and its structure is divided into two parts: the upper part protrudes from the windshield structure end cover to facilitate disassembly when the microphone is separated from the structure; the lower vertical part is used to connect with the structure, and the connection method includes but is not limited to using interference fit between parts, threaded connection, and elastic expansion of elastic materials. The use of the connection terminal is: first, pass the wire of the microphone through the through hole in the middle of the connection terminal, then place the microphone inside the structure through the opening at the top of the windshield structure, and then insert the vertical part of the connection terminal into the circular hole on the structure. The appearance of the connection terminal can be designed into different shapes according to needs, such as but not limited to rectangle, triangle, etc.

[0043] Restrictions on the materials that make up the windshield: The windshield structure is made of hard material 3D printing or metal machining. Specific materials include but are not limited to: photosensitive resin, stainless steel, aluminum alloy, acrylic, etc., and has certain drop resistance, pressure resistance and waterproof capabilities.

[0044] Definition of filling materials in the acoustic sensor (microphone) area: Different types of porous fillers can be filled inside the central cavity of the windshield structure (the area where the microphone is placed) to further optimize the wind noise reduction effect. Filler types include but are not limited to polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foam, glass fiber materials, etc.

[0045] Definition of filling materials in the pleated channel area inside the windshield: Different types of porous fillers can be filled in the pleated channel area outside the central cavity of the windshield structure to further enhance the wind noise reduction effect. Filler types include but are not limited to polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foam, glass fiber materials, etc.

[0046] Definition of the outer covering material of the windshield shell: The outer area of ​​the windshield shell can be covered with various porous materials to further enhance the wind noise reduction effect. The covering materials include but are not limited to polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foams, glass fiber materials, etc.

[0047] Restrictions on the shape of the windshield shell: The shape of the windshield shell structure can adopt different design schemes according to actual needs, including but not limited to: a cylindrical shell, a spherical shell, a polyhedral shell, a disc-shaped shell, etc.

[0048] Limitations on the specific dimensions of the slit opening and the pleated channel structure of the windshield: In order to ensure that sound waves can enter the windshield with low loss while ensuring its anti-wind noise effect, the width of the pleated channel inside the windshield needs to be designed within a reasonable range, including but not limited to g=0.1mm~5mm according to actual needs.

[0049] The working principle of the microphone windshield structure for collecting sound signals in harsh outdoor environments described in the present invention is:

[0050] The windshield structure is mainly composed of the surrounding spoiler layer pleated channel and the cavity where the microphone is placed inside. The outer pleated channel is responsible for dissipating the airflow entering the windshield and reducing the wind field flow velocity inside the windshield structure. The internal cavity is used to place and protect the microphone, realize the sound-to-electric conversion, and collect acoustic signals.

[0051] When air flows through the windshield structure, it first passes through the outer pleated channel. Due to the viscosity effect caused by the narrow pleated channel and the increase in the path caused by the pleats, the airflow velocity in the wind field is greatly reduced. At the same time, the wind pressure interference acting on the surface of the microphone sound-sensitive element is significantly reduced, thereby effectively suppressing the serious interference of wind noise on the microphone. It should be noted that the design of the pleated channel inside the windshield is not a single structure, and its geometric shape and size can be adjusted according to actual conditions to achieve the best spoiler effect.

[0052] It should be noted that the size of the central cavity inside the windshield should be large enough to accommodate a small microphone. In addition, in addition to the necessary sound holes (slit openings in the outer shell) for sound waves to enter the windshield, the rest of the windshield should be as airtight as possible to prevent excessive airflow from entering the windshield and affecting the wind noise reduction effect.

[0053] In addition, the material density of the windshield structure is much greater than that of air, and it has a certain hardness, strength and high temperature resistance. It can withstand a certain degree of pressure, collision and high temperature, and effectively protect the internal microphone sensor.

[0054] The windshield structure of the present invention can effectively reduce the impact of wind noise on the internal microphone, and is used to improve the working performance of the microphone in harsh environments such as outdoor wind and rain. The windshield structure of the present invention serves as a shell to place a small microphone inside. The narrow pleated channel inside the windshield can increase the path of the wind, and reduce the wind speed through the effect of viscous dissipation of the wind field, thereby significantly reducing the wind load impact on the internal microphone and suppressing the interference of wind noise. At the same time, the entire windshield structure is completely made of hard materials. Compared with traditional porous sponge microphone windshields, it has better pressure resistance and drop resistance, and improves the applicability and reliability of the microphone working in harsh environments.

[0055] Figure 1 The application of the present invention in a vehicle-mounted acoustic detection system is demonstrated. The windshield structure designed by the present invention is combined with a microphone array to reduce the serious wind noise problem generated by the acoustic detection system during the high-speed movement of the platform, and can provide a certain degree of protection for the microphone from rain, dust and collision.

[0056] Figure 2 to Figure 4 The three-dimensional view of the microphone windshield structure and its internal cross-sectional view are shown. The windshield consists of an outer shell, an internal pleated channel area, and a central cavity area. After placing the small microphone in the central cavity of the windshield and installing the connection terminals, the upper and lower ends of the windshield are closed, so that the airflow can only enter the internal cavity through the pleated channels of the windshield. In some embodiments, the cross-sectional shape of the outer shell is not limited to a circle, and the arrangement of the pleated channels is not limited to a fan-shaped circular arrangement, and can be adjusted according to actual needs. Figure 4 As shown, the number m of the fan-shaped areas of the pleated channel can be set to 2 to 16 to achieve the directivity (directional microphone) or omnidirectionality (omnidirectional microphone) of its acoustic spatial response.

[0057] When in use, a small microphone is generally installed inside a windshield structure, so it is necessary to ensure its stability during use, while also meeting the requirement that the microphone can be easily disassembled. Figure 5 to Figure 7 As shown in the figure, in order to facilitate the installation and removal of the microphone and the windshield, a microphone-windshield connection terminal is designed. Figure 5 (a) It can be seen that the structure of the connecting terminal is divided into two parts: the upper structure is a truncated cone with a thick upper end and a thin lower end. The purpose of this design is to make the terminal easier to disassemble when it needs to be separated from the windshield structure. The lower part of the connecting terminal is an equal-diameter cylinder, the diameter of which is consistent with the diameter of the opening at the top of the main structure, and the height is consistent with the thickness of the upper cover of the main structure. The purpose of this design is to ensure the sealing of the terminal. The entire terminal has a through hole in the middle, and the microphone wire passes through it, so the diameter of the through hole is determined by the thickness of the wire. The appearance of the connecting terminal can be designed into different shapes as needed, such as but not limited to square, triangle, etc. In some embodiments, the connection between the lower half of the terminal and the structure is not limited to one method, and the connection can be achieved by interference fit between parts, threaded connection, and elastic expansion of elastic materials.

[0058] In order to make the windshield structure protect the internal microphone, the material of the structure can be alloy, hard plastic, organic glass, carbon fiber and other hard materials. The processing method can use 3D printing, machine tool processing, mold processing and other methods to achieve the integration standard.

[0059] Figure 8 The figure shows the flow field distribution around the microphone when it is in the wind field and the wind pressure load on the surface of the microphone sensor with and without the wind shield structure. It can be clearly seen from the figure that when the wind shield structure exists, the airflow will move along the wall to both sides of the structure, and the turbulent pressure will be concentrated on the wall surface of the structure. Since the upper and lower covers close the structure, part of the airflow can only enter the structure along the pleated channel (the pleated channel is also used to introduce sound waves). However, this part of the airflow will reduce the flow rate due to the viscosity effect and dissipate as heat, which greatly reduces the wind pressure load of the airflow entering the inner cavity on the microphone inside, thereby effectively suppressing the interference of wind noise on the microphone.

[0060] Fig. 9 and Fig.10 The time domain waveform and wind noise power spectrum of the signal output by the built-in microphone in the wind field are shown with and without the wind shield structure. Fig. 9It can be seen from the time domain waveform of wind noise that when the wind shield structure is used, the wind noise interference amplitude is significantly reduced. Fig.10 It can be seen from the wind noise power spectrum that in the low-frequency band below 1kHz where wind noise is mainly concentrated, the windscreen structure can reduce the noise by 10dB to 20dB.

[0061] Another outstanding advantage of the windshield structure embodiment of the present application is that while reducing wind noise, the windshield will not affect the sound pickup capability of the internal microphone. Fig.11 As shown, the amplitude-frequency response curve of the microphone does not change significantly with and without the windshield structure, which proves that the windshield structure does not attenuate the acoustic signal.

[0062] In some embodiments of the present invention, the geometric parameters of the windshield structure are not fixed, and different parameters may have different wind noise reduction effects. Fig.12 and Fig.13 As shown, the windshield structures with different pleat channel widths g all have obvious wind noise reduction effects. In order to ensure that the wind noise reduction and sound transmission performance of these structures are not affected, the value of g should be designed within a reasonable range.

[0063] In order to further enhance the noise reduction effect of the windshield structure, Fig.14 Several combined windshield structural design solutions according to some embodiments of the present invention are provided. Fig.14 As shown in (a), an embedded filler can be filled inside the pleated channel to further increase the viscous consumption of the airflow when it passes through, thereby improving the wind noise suppression effect. Fig.14 As shown in (b), the filler can also be placed in the inner cavity of the central area of ​​the windshield, so that the airflow entering the central area of ​​the windshield is further dissipated through the filler, which can also reduce wind noise. It is worth noting that in addition to further reducing wind noise, this filling method can also enhance the fixing effect of the internal microphone and improve its stability. Fig.14 (c) shows the use of porous fillers in both the pleated channel area and the central cavity area of ​​the windshield. In addition to embedded fillers, Fig.14 (d) A wrapping composite structure design is given. The design of the windshield shell can easily cover different porous materials on its surface, which can effectively block the airflow and provide a certain degree of protection for the structure. Fig.14 (e) is another composite structure type that combines the two design methods of embedded type and wrapped type. In some embodiments, the internal filling material and the outer shell covering material of the windshield can be, but are not limited to, porous materials, fiber-type materials, microstructures, and other media that can damp the airflow.

[0064] It should be noted that Fig.14 The embedded filler and coating shown can be applied to any windshield structure and its variant design in the present invention. Further, the various windshield structures described in the present invention can be crossed, replaced and combined into new structures, and such variations all belong to the protection scope of the present invention.

[0065] Fig.15 Several different windshield shell shape design schemes are given. Different design schemes can be selected according to the actual use environment. It is worth mentioning that Fig.15 The designs shown are only a few examples, and other common geometric shapes fall within the protection scope of the present invention.

[0066] Fig.16 The acoustic performance test results of a certain microphone windshield structure in a simulated rainy environment of the present invention are given. Fig.16 (a) is the schematic diagram of the experiment. Fig.16 (b) is the response of the microphone sound signal inside the windshield in the presence / absence of rain. The above results show that the sound signal intensity and frequency response curve of the windshield do not change significantly in the presence / absence of rain, which proves that the microphone windshield in the present invention can effectively ensure the microphone's sound pickup performance in a rainy environment.

[0067] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A microphone windshield structure for outdoor harsh environments, characterized by: The microphone windshield structure comprises an outer shell and an inner central cavity, the side wall of the outer shell is provided with a plurality of slit openings, the inner shell is provided with a plurality of rotationally symmetrical structural units, the inner central cavity is a circular or spherical area for placing a microphone sensor, a pleated channel is provided in the rotationally symmetrical structural unit, the starting end of the channel opens to face the inner central cavity, and the end of the channel is a slit opening of the side wall of the outer shell; 2 to 16 rotationally symmetrical structural units are arranged inside the shell; The wall thickness of the rotationally symmetrical structural unit is t=0.5 mm to 5 mm, and the width of the pleated channel in the rotationally symmetrical structural unit is g=0.1 mm to 5 mm; The outer radius of the shell is R = 10 mm to 50 mm, and the radius of the inner central cavity is r = 2 mm to 30 mm; The height H of the shell is 10 mm to 100 mm.

2. The microphone windshield structure for outdoor harsh environments according to claim 1, characterized in that: The shell is made by 3D printing of hard materials or by metal machining.

3. The microphone windshield structure for outdoor harsh environments according to claim 1, characterized in that: The inner central cavity is filled with porous materials to further optimize the wind noise reduction effect. The porous materials include polyurethane porous materials, metal porous materials, sponge materials, wood fiber materials, polymer foam or glass fiber materials.

4. The microphone windshield structure for outdoor harsh environments according to claim 1, characterized in that: Filling the pleated channel of the rotationally symmetrical structural unit with porous material is used to further enhance the wind noise reduction effect. The porous material includes polyurethane porous material, metal porous material, sponge material, wood fiber material, polymer foam or glass fiber material.

5. The microphone windshield structure for outdoor harsh environments according to claim 1, characterized in that: The outer part of the shell is coated with a porous material to further enhance the wind noise reduction effect, wherein the porous material includes a polyurethane porous material, a metal porous material, a sponge material, a wood fiber material, a polymer foam or a glass fiber material.

6. The microphone windshield structure for outdoor harsh environments according to claim 1, characterized in that: The shape of the shell is a cylindrical shell, a spherical shell, a polyhedral shell or a disc-shaped shell.

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