Electronic device for reducing wind noise and its application

Abstract

The present invention provides an electronic device for reducing wind noise and its application. The raw materials of the porous block material include zeolite, adhesive and dispersant. The present invention also provides an electronic device comprising the above-mentioned porous block material. The present invention further provides an electronic device for reducing wind noise, including a body, an arc cover and a PCB board, the two ends of the body are respectively connected to the PCB board and the arc cover, the body is provided with an inner sound channel along the central axis, the arc cover is provided with an outer sound channel, the outer sound channel is in a windmill-shaped structure as a whole, including a central cavity and a plurality of branch channels, the branch channels are radially arranged around the central cavity, and each branch channel is a streamlined arc structure. The present invention further provides the application of the above-mentioned electronic device in an electronic device with a microphone. The electronic device provided by the present invention can effectively reduce wind noise and significantly improve the call quality of communication equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to a porous block material and application thereof, an electronic device for reducing wind noise and application thereof. Background Art

[0002] Nowadays, mobile electronic devices such as smart phones, telephones, conventional headphones, Bluetooth headphones, TWS headphones, etc. all have outdoor calling functions. To realize the calling function, it is necessary to set a microphone in the shell, and usually the sound hole of the microphone body is connected to the sound pickup hole of the shell. When the wind blows through the sound pickup hole, eddy noise will be generated on the surface of the sound pickup hole. From the sound pickup hole of the shell to the sound hole of the microphone, the eddy noise may be enhanced due to the resonance of the air column, and some eddy noise will also be generated at the sound hole of the microphone. After this eddy noise is picked up by the microphone, it often causes the other party to not hear clearly during outdoor calls. At the same time, when the party listens to music with noise-canceling headphones, the wind noise is not easy to be recognized by the system, which will also cause the problem of unclear hearing for the party.

[0003] The existing technical solutions for reducing wind noise are mainly divided into the following four categories: 1. Using DSP algorithm to reduce wind noise, which belongs to the category of active noise reduction; 2. Adopting acoustic methods, including selecting acoustic structures and acoustic materials with reasonable configuration of acoustic parameters, and corresponding microphone units, which belongs to passive noise reduction; 3. Using the principle of bone conduction to suppress wind noise; 4. A combination of the above three methods.

[0004] However, the commonly used technical solutions also have corresponding disadvantages: 1. The DSP algorithm reduces wind noise, but the cost is relatively high and will affect the sound quality to a certain extent; 2. The existing portable outdoor communication equipment is getting smaller and smaller, and conventional acoustic materials, such as foam, can no longer play a role in a very small space; 3. Bone conduction technology has high requirements on the process, and bone conduction headphones have the problem of sound leakage. Currently, headphones that use bone conduction technology are generally larger in size. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a porous block material and its application, an electronic device for reducing wind noise and its application, which can effectively reduce wind speed, has a good noise reduction effect, and is conducive to improving call quality.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a porous block material, the raw materials of which include zeolite, an adhesive and a dispersant, wherein the mass of the solid component of the adhesive is 1-20% of the mass of the zeolite, and the mass of the dispersant is 1-3% of the mass of the zeolite.

[0007] In a specific embodiment of the present invention, the porous block material generally has a multi-level pore structure, that is, a porous material, so as to reduce the wind speed and reduce the eddy noise. In some specific embodiments, the porous block material generally includes a first-level pore with a pore size of 0.3nm-0.7nm, a second-level pore with a pore size of 10nm-50nm, and a third-level pore with a pore size of 2μm-200μm. In some specific embodiments, the third-level pores may include intercrystalline interstitial pores with a pore size of 2μm-10μm and / or array macropores with a pore size of 10μm-200μm, and the pore volume of the intercrystalline interstitial pores may be 1-5% of the pore volume of the third-level pores. The array macropores may be macropores formed by the array needle plate completely penetrating or partially penetrating the porous block material.

[0008] In some specific embodiments, the zeolite may include one or a combination of two or more of MFI structure molecular sieve, FER structure molecular sieve, CHA structure molecular sieve, MEL structure molecular sieve, TON structure molecular sieve, MTT structure molecular sieve, and ZSM-5 molecular sieve. The particle size of the zeolite is generally 0.5μm-10μm. The zeolite generally includes micropores with a pore size of 0.3-0.7nm and mesopores with a pore size of 10-30nm, wherein the pore volume of the mesopores of the zeolite generally accounts for 20-45% of the total pore volume of the zeolite, preferably 25-35%.

[0009] In a specific embodiment of the present invention, the adhesive may include an organic adhesive and / or an inorganic adhesive, generally in the form of a suspension or a sol. The organic adhesive may include one or a combination of two or more of a polyacrylate suspension, a polystyrene acetate suspension, a polyvinyl acetate suspension, a polyethyl vinyl acetate suspension, and a polybutadiene rubber suspension, and the inorganic adhesive may include a silica sol and / or an alumina sol. The mass of the solid component of the adhesive is preferably 5-15% of the mass of the porous block material.

[0010] In a specific embodiment of the present invention, the dispersant may include one or a combination of two or more of ethanol, ethylene glycol, glycerol, sodium hexametaphosphate and sodium dodecylbenzene sulfonate.

[0011] In a specific embodiment of the present invention, the porous block material may also include a pore-forming aid and / or a reinforcing aid. The pore-forming aid can increase the pore volume of the porous block material, and generally includes one or a combination of more than two of ammonia water, hydrogen peroxide, ammonium chloride, ammonium nitrate, and sodium carbonate; the mass of the pore-forming aid is generally 0.5-5% of the mass of the zeolite, preferably 1-3%. The reinforcing aid can improve the mechanical properties of the porous block material, and generally includes a fiber material. The diameter of the fiber in the fiber material is generally 1μm-10μm, and the length is generally 20μm-1mm. The fiber material may include chemical fibers and / or plant fibers, wherein the chemical fibers preferably include inorganic fibers. The mass of the reinforcing aid is generally 3-15% of the mass of the zeolite, preferably 5-10%.

[0012] In a specific embodiment of the present invention, the porous block material can be a block material obtained by forming a raw material suspension formed by mixing zeolite with an adhesive, a dispersant and an additive (when the raw material of the porous block material includes a pore-forming additive and / or a reinforcing additive, the raw material suspension also includes a pore-forming additive and / or a reinforcing additive accordingly) through extrusion, spraying, casting, molding and other processing methods. In some embodiments, the porous material can be further obtained by hot air drying or freeze-drying. The porous block material thus obtained generally has the same characteristic impedance.

[0013] In a specific embodiment of the present invention, the porous block material can be a block material obtained by spraying. Specifically, the block porous block material can be prepared by mixing zeolite, adhesive, dispersant, filler and auxiliary agent to form a raw material suspension (when the raw material of the porous block material includes a pore-forming auxiliary agent and / or a reinforcing auxiliary agent, the raw material suspension also includes a pore-forming auxiliary agent and / or a reinforcing auxiliary agent accordingly), and then uniformly dispersing the raw material suspension on fiber paper. In some specific embodiments, the porous block material can be formed by a single fiber paper loaded with a raw material suspension, or it can be formed by stacking multiple fiber papers loaded with a raw material suspension and then molding before drying. Since the degree of penetration of the raw material suspension on the fiber paper is different, the porous block material obtained by this preparation method is generally a material with layered changes in characteristic impedance.

[0014] In the above-mentioned porous block material, the fiber paper generally includes one or a combination of two or more of polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyvinyl formal fiber, PETT (polyethylene terephthalate-polypropylene terephthalate copolyester) fiber. The thickness of the fiber paper (not loaded with raw material suspension) is generally 50μm-200μm, and the thickness of the fiber paper loaded with raw material suspension is generally 100μm-600μm. The fiber paper generally has macropores with a pore size of 10μm-100μm, and the macropores are macropores with uneven particle sizes formed during the preparation of the fiber paper. The porous block material also includes macropores formed by the array needle plate completely penetrating or partially penetrating the fiber paper, and the pore size is 1-100μm. The porous material block including fiber paper in the raw material can also be called a fiber porous block. In some specific embodiments, the thickness of the fibrous porous block can be adjusted by the thickness of the fibers or the number of stacking layers, so that the size of the fibrous porous block matches the size of the space it fills (generally, the acoustic channel structure).

[0015] The present invention further provides an electronic device comprising the porous block material. Specifically, the porous block material can be used as a sound absorbing material to fill the sound channel of the electronic device to reduce wind noise.

[0016] The present invention also provides an electronic device for reducing wind noise, which includes a body, an arc-shaped cover and a PCB board; wherein the body is a tubular structure, one end of which is connected to the PCB board, and the other end is connected to the arc-shaped cover, and the interior of the body is provided with an inner sound channel along the central axis; the interior of the arc-shaped cover is provided with an outer sound channel along the horizontal direction, and the outer sound channel is an overall windmill-shaped structure, including a central cavity and a plurality of channels, the central cavity is connected to the inner sound channel, and the branch channels are radially arranged around the central cavity, and each branch channel is a streamlined arc-shaped structure.

[0017] In a specific embodiment of the present invention, the branch channels of the external sound channel are streamlined arc-shaped, that is, the openings of each branch channel extend from the outside of the arc cover to the central cavity along an arc-shaped trajectory. When the ambient wind enters the external sound channel from the external port, the streamlined arc-shaped structure of each branch channel can extend the moving distance and time of the ambient wind, which is conducive to wind speed attenuation and achieves a certain noise reduction effect.

[0018] In a specific embodiment of the present invention, the body and the arc cover can be an integrally formed structure. The plane where the external sound channel is located is generally parallel or approximately parallel to the horizontal plane at the connection between the body and the arc cover. The branch channels in the external sound channel can be uniformly radially distributed around the central cavity. The direction away from the PCB board is defined as "outside", and the diameter of each branch channel in the external sound channel generally decreases from outside to inside. In some specific embodiments, the channels in the external sound channel are generally more than two, such as two, three, four, etc.

[0019] In a specific embodiment of the present invention, the axis of the inner channel can be perpendicular to the plane where the outer channel is located. One end of the inner channel contacts the PCB board, and the other end is connected to the central cavity. The inner channel and the outer channel together constitute a sound pickup channel of the electronic device.

[0020] In a specific embodiment of the present invention, the diameter of each channel in the external sound channel may be gradually reduced from the outside of the electronic device to the inside of the electronic device.

[0021] In a specific implementation of the present invention, a sound pickup hole is generally provided at the center of the PCB board, and the sound pickup hole is generally connected to the inner sound channel and further connected to the central cavity of the outer sound channel.

[0022] In a specific embodiment of the present invention, the shape of the horizontal cross-section of the inner sound channel (the direction parallel to the plane where the PCB board is located) can be circular. The shape of the longitudinal section of the inner sound channel (the direction perpendicular to the plane where the PCB board is located) can be rectangular or trapezoidal, that is, the inner sound channel as a whole can be cylindrical or truncated cone-shaped. When the longitudinal section of the inner sound channel is a trapezoid, the diameters of the two ports of the inner sound channel match the diameter of the central cavity of the outer sound channel in contact with it, and the diameter of the pickup hole; when the axial cross-section of the inner sound channel is a trapezoid, the diameter of the port of the inner sound channel close to the PCB board can be greater than or equal to the diameter of the pickup hole. In some specific embodiments, the diameter of the pickup hole can be less than or equal to the diameter of the central cavity of the outer sound channel.

[0023] In a specific embodiment of the present invention, the inner sound channel can be filled with a porous block material to further reduce the wind speed of the incoming ambient wind. The porous block material can be the above-mentioned porous block material or other porous block materials available in the art that can be used as sound-absorbing materials. The porous block material can be fixed in the inner sound channel to prevent it from falling off.

[0024] In a specific embodiment of the present invention, the porous block material filled in the inner sound channel can have the same characteristic impedance, or can have a layered change according to the characteristic impedance. The porous block material with a layered change in characteristic impedance is more conducive to gradually reducing the ambient wind during the flow of the inner sound channel, thereby reducing wind noise. In some specific embodiments, the impedance of the porous block material changes in layers along the direction from the central cavity of the outer sound channel to the PCB board. For example, the characteristic impedance of the porous block material can be layered in the order of gradually increasing along the direction from the central cavity of the outer sound channel to the PCB board.

[0025] The present invention further provides an application of the above-mentioned electronic device in an electronic device with a microphone. For example, the above-mentioned electronic device can be applied to a TWS headset to reduce the impact of wind noise on call quality.

[0026] The beneficial effects of the present invention are:

[0027] The electronic device provided by the present invention has a simple structure, good and stable performance, low cost, small size and is easy to carry. The external sound channel of the electronic device is a windmill-shaped structure, with a plurality of channels connected to the outside world. After the ambient wind enters the external sound channel, its wind speed can be effectively reduced, thereby achieving a better noise reduction effect; the internal sound channel of the electronic device is filled with porous block materials, which can further reduce the wind speed and thus reduce the wind noise; when the porous block materials change in layers according to the characteristic impedance, the internal sound channel has different characteristic impedances as the position of the porous block materials changes, which can more effectively reduce the wind speed and play a role in reducing wind noise.

[0028] In summary, the present invention, through the special design of the external sound channel structure and the filling of porous block materials in the internal sound channel, can gradually reduce the wind speed when the ambient wind enters the electronic device and moves to the sound pickup hole, synergistically reduce wind noise, and effectively improve the sound quality and call quality. It is suitable for electronic devices with microphones (such as TWS headphones). BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the third-level pore distribution of the porous block material in Example 1.

[0030] Figure 2 It is an isometric view of the appearance of the electronic device of Example 3 to Example 5.

[0031] Figure 3 It is a cross-sectional isometric view of the electronic device of Example 3 to Example 5.

[0032] Figure 4 This is an AA cross-sectional view of the electronic device of Example 3-Example 4, in which the porous block material is not shown.

[0033] Figure 5 It is a cross-sectional view of the electronic device of Example 3-Example 4, which schematically shows a porous block material.

[0034] Figure 6 This is an AA cross-sectional view of the electronic device of Example 5, in which the porous block material is not shown.

[0035] Figure 7 It is a cross-sectional view of the electronic device of Example 5, which schematically shows a porous block material.

[0036] Explanation of symbols

[0037] 1 is the body, 2 is the arc cover, 3 is the PCB board, 11 is the inner sound channel, 21 is the outer sound channel, 211, 212, 213, 214 are branch channels of the outer sound channel, 31 is the sound pickup hole, and 4 is a porous block material. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "several" means two or more, unless otherwise clearly and specifically defined.

[0040] In a specific embodiment of the present invention, the porous block material can be a block material obtained by forming a raw material suspension formed by zeolite powder, an adhesive, and a dispersant (which may further include a pore-forming aid and / or a reinforcing aid) through extrusion, spraying, pouring, or molding, and then hot air drying or freeze-drying; it can also be a block material prepared by uniformly dispersing the above-mentioned raw material suspension on fiber paper.

[0041] In a specific embodiment of the present invention, the porous block material may be a material having a multi-level pore structure, generally including first-level pores with a pore size of 0.3nm-0.7nm, second-level pores with a pore size of 10nm-50nm, and third-level pores with a pore size of 2μm-200μm. In some specific embodiments, the third-level pores may include intercrystalline interstitial pores with a pore size of 2μm-10μm and / or array macropores with a pore size of 10μm-200μm, and the pore volume of the intercrystalline interstitial pores may be 1-5% of the pore volume of the third-level pores. The array macropores may be macropores formed by pressing an array needle plate, which is a parallel needle plate formed by etching a silicon substrate, each needle having a diameter of 10μm-200μm, and the density of the array needles is 30 needles / square centimeter.

[0042] In the above-mentioned porous block material, the zeolite may include one or a combination of two or more of MFI structure molecular sieves, FER structure molecular sieves, CHA structure molecular sieves, MEL structure molecular sieves, TON structure molecular sieves, and MTT structure molecular sieves. The particle size of the zeolite may be 0.5 μm-10 μm. The zeolite generally has micropores with a pore size of 0.3-0.7 nm and mesopores with a pore size of 10-30 nm. The pore volume of the mesopores generally accounts for 20-45% of the total pore volume of the zeolite, preferably 25-35%.

[0043] In the above-mentioned porous block material, the adhesive can be in the form of a suspension or a sol, and the mass of the solid component of the adhesive is generally controlled to be 1%-20% of the mass of the zeolite material, preferably 5-15%. The adhesive can include an organic adhesive and / or an inorganic adhesive. Among them, the organic adhesive can include one or a combination of two or more of a polyacrylate suspension, a polystyrene acetate suspension, a polyethylene acetate suspension, a polyethylene acetate suspension, and a polybutadiene rubber suspension, and the inorganic adhesive can include silica sol and / or alumina sol.

[0044] In the above porous block material, the mass of the dispersant is generally controlled to be 1%-3% of the mass of the zeolite material. The dispersant may include one or a combination of two or more of ethanol, ethylene glycol, glycerol, sodium hexametaphosphate and sodium dodecylbenzene sulfonate.

[0045] In the above-mentioned porous bulk material, the additive may include a pore-forming additive and / or a reinforcing additive. The pore-forming additive can increase the pore volume of the porous bulk material. The mass of the pore-forming agent is generally controlled to be 0.5%-5% of the mass of the zeolite material, preferably 1%-3%, and generally includes one or a combination of more than two of ammonia water, hydrogen peroxide, ammonium chloride, ammonium nitrate, and sodium carbonate. The reinforcing additive can improve the mechanical properties of the porous bulk material, and its mass is generally controlled to be 3%-15% of the mass of the zeolite material, preferably 5%-10%. The reinforcing agent generally includes a fiber material, and the diameter of the fiber in the fiber material is generally 1μm-10μm and the length is generally 20μm-1mm. The fiber material may include chemical fiber and / or plant fiber, wherein the chemical fiber preferably includes inorganic fiber.

[0046] Example 1

[0047] This embodiment provides a porous block material, which is a block material prepared from a raw material suspension formed by zeolite, adhesive, dispersant, pore-forming aid and reinforcing aid, and the overall characteristic impedance distribution of the material is uniform. Among them, the zeolite is a ZSM-5 molecular sieve with a particle size of 1.2μm. The molecular sieve includes micropores with an average pore size of 0.748nm and mesopores with an average pore size of 14.39nm. The pore volume of the mesopores accounts for 29% of the total pore volume of the zeolite. The adhesive is a polyacrylate suspension, and its mass is 9% of the mass of the zeolite. The dispersant is glycerol, and its mass is 1.5% of the mass of the zeolite. The pore-forming aid is ammonia water, and its mass is 2% of the mass of the zeolite. The reinforcing aid is glass fiber, and its mass is 8% of the mass of the zeolite.

[0048] The specific preparation process of the porous block material in this embodiment is as follows: 100g ZSM-5 powder is mixed with 100g water, 18g 50% solid polyacrylate suspension, 1.5g glycerol, 2g ammonia water, and 8g glass fiber through 3min ultrasonic treatment and 30min stirring to prepare a uniform raw material suspension, the raw material suspension is introduced into a prefabricated mold, and formed by -40°C low-temperature freezing, vacuum low-temperature sublimation, and temperature analysis for dehydration, and the dehydrated molded product is pressed with an array needle plate, and demolded by pushing on a flat plate to prepare a porous block material.

[0049] The porous block material used in this embodiment has a three-level pore structure, which includes first-level pores with a pore size of 0.748 nm, second-level pores with a pore size of 14.27 nm, and third-level pores with an average pore size of 67.9 μm. The third-level pores include 5.6 μm intercrystalline interstitial pores (i.e., pores generated by grain accumulation) and array macropores with a pore size of 120 μm. The array macropores can be produced by the above array needle plate. The arrangement of the array macropores includes but is not limited to Figure 1The method for measuring the pore size of the intercrystalline interstitial pores of the porous bulk material can be: before manufacturing array macropores in the porous bulk material with an array needle plate, the porous bulk material without array macropores is measured for pore size with a mercury intrusion instrument.

[0050] Example 2

[0051] This embodiment provides a porous block material, which is a block material prepared by uniformly dispersing a raw material suspension formed by zeolite, adhesive, dispersant, and pore-forming aid on fiber paper. Among them, the zeolite is a ZSM-5 molecular sieve with a particle size of 1.2μm. The molecular sieve includes micropores with an average pore size of 0.748nm and mesopores with an average pore size of 14.39nm. The pore volume of the mesopores accounts for 29% of the total pore volume of the zeolite. The adhesive is a polyacrylate suspension, and its mass is 7% of the mass of the zeolite. The dispersant is glycerol, and its mass is 1% of the mass of the zeolite. The pore-forming aid is ammonia water, and its mass is 2% of the mass of the zeolite.

[0052] The specific preparation process of the porous block material in this embodiment is as follows: 100g ZSM-5 powder is mixed with 100g water, 14g 50% solid polyacrylate suspension, 1g glycerol, and 2g ammonia water by 3min ultrasonication and 30min stirring to prepare a uniform suspension, the fiber paper is soaked in the slurry for 10min, and the fiber paper is pressed by a flat plate, formed by freezing at -40℃, sublimated by vacuum and heated for dehydration, pressed by an array needle plate, and demolded by pushing on a flat plate to prepare a porous block material. The porous block material thus formed has a characteristic impedance that varies in layers.

[0053] The porous block material of this embodiment has a three-level pore structure, which are first-level pores with a pore size of 0.748nm, second-level pores with a pore size of 14.27nm, and third-level pores. The third-level pores include macropores with a pore size of 10μm-100μm in the fiber paper and 80μm macropores formed by the array needle plate. In addition, the third-level pores also include intercrystalline interstitial pores. However, because the macropores in the fiber paper used in this embodiment play a major role in sound absorption and have a large pore size, which interferes with the pore size measurement results of the intercrystalline interstitial pores, the specific pore size of the intercrystalline interstitial pores will not be introduced here.

[0054] Example 3

[0055] This embodiment provides an electronic device capable of reducing wind noise. Figure 2 is an isometric view of the electronic device of this embodiment, Figure 2 The middle dashed line represents the perspective structure. Figure 3 is an axial cross-sectional view of the electronic device in this embodiment, Figure 4 for Figure 3 The cross-sectional view of the AA surface in Figure 5 For Figure 4Schematic diagram of the electronic device structure after the foundation is filled with porous block material.

[0056] like Figure 2-Figure 5 As shown, the electronic device includes a body 1, an arc cover 2 and a PCB board 3. The body 1 is a tubular structure, one end of which is closed by the PCB board 3 and the other end is closed by the arc cover 2. The body 1, the PCB board 3 and the arc cover 2 together form a cylinder with an arc-shaped end, which is the physical part of the electronic device.

[0057] An external sound channel 21 with a windmill-shaped structure is provided inside the arc cover 2. The external sound channel 21 consists of a central cavity and branch channels 211, 212, 213, and 214. The central cavity is located at the center of the horizontal plane where the main body 1 and the arc cover 2 are connected. The branch channels 211, 212, 213, and 214 are centered on the central cavity and extend radially toward the arc cover 2 in a uniform manner, that is, one end opening of each branch channel is connected to the central cavity, and the other end opening is connected to the outside of the arc cover 2. In the horizontal direction, each branch channel is approximately in the same plane. The shape of each branch channel is a streamlined arc structure, and the diameter gradually decreases from the outside to the inside.

[0058] An inner sound channel 11 is provided inside the body 1 along the central axis. The inner sound channel 11 has a rectangular axial section and a circular cross section. Figure 5 As shown, the inner sound channel 11 is filled with a porous block material 4, and the porous block material 4 is the porous block material prepared in Example 1.

[0059] A through sound pickup hole 31 is provided at the center of the PCB board 3. The PCB board 3 used in this embodiment is provided with a microphone.

[0060] The sound pickup hole 31, the inner sound channel 11 and the central cavity are connected in sequence. The diameter of the inner sound channel 11 is larger than the diameter of the sound pickup hole 31 and matches the diameter of the central cavity.

[0061] During the use of the electronic device of this embodiment, the ambient wind first enters the electronic device from the ports of each branch channel of the outer sound channel 21 and is decelerated. The initially decelerated ambient wind continues to enter the inner sound channel 11 and contacts the porous block material 4. The porous structure in the porous block material 4 can further reduce the wind speed. After multiple decelerations, the wind noise generated by the ambient wind is greatly reduced, thereby achieving the effect of improving the sound quality.

[0062] Example 4

[0063] This embodiment provides an electronic device capable of reducing wind noise, and the structure of the electronic device is basically the same as that of the electronic device in Embodiment 3, except that the porous block material filled in the inner sound channel 11 is different. This embodiment uses the porous block material prepared in Embodiment 2, which has a layered characteristic impedance.

[0064] During the use of the electronic device of this embodiment, the ambient wind first enters the electronic device of the external sound channel 21 through the ports of each branch channel of the external sound channel 21 and is decelerated. The initially decelerated ambient wind continues to enter the internal sound channel 11 and contacts the porous block material 4. The multi-level hole structure in the porous block material 4 can further reduce the wind speed. At the same time, since the impedance characteristics of the fiber paper block change from top to bottom (from the direction of the external sound channel 21 to the PCB board 3) in layers, the wind noise generated by the ambient wind has been reduced layer by layer before reaching the pickup hole 31, thereby achieving the effect of reducing noise interference and improving call quality.

[0065] Example 5

[0066] This embodiment provides an electronic device capable of reducing wind noise.

[0067] Figure 2 is an isometric view of the electronic device of this embodiment, Figure 2 The middle dashed line represents the perspective structure. Figure 6 is an axial cross-sectional view of the electronic device in this embodiment, Figure 4 for Figure 6 The cross-sectional view of the AA surface in Figure 7 For Figure 6 Schematic diagram of the electronic device structure after the foundation is filled with porous block material.

[0068] like Figure 2 , Figure 4 , Figure 6 , Figure 7 As shown, the electronic device includes a body 1, an arc cover 2 and a PCB board 3. The body 1 is a tubular structure, one end of which is closed by the PCB board 3 and the other end is closed by the arc cover 2. The body 1, the PCB board 3 and the arc cover 2 together form a cylinder with an arc-shaped end, which is the physical part of the electronic device.

[0069] An external sound channel 21 with a windmill-shaped structure is provided inside the arc cover 2. The external sound channel 21 consists of a central cavity and branch channels 211, 212, 213, and 214. The central cavity is located at the center of the horizontal plane where the main body 1 and the arc cover 2 are connected. The branch channels 11, 12, 21, and 22 are centered on the central cavity and extend radially toward the arc cover 2 in a uniform manner, that is, one end opening of each branch channel is connected to the central cavity, and the other end opening is connected to the outside of the arc cover 2. In the horizontal direction, each branch channel is approximately in the same plane. The shape of each branch channel is a streamlined arc structure, and the diameter gradually decreases from the outside to the inside.

[0070] An inner sound channel 11 is provided inside the body 1 along the central axis. The inner sound channel 11 has a trapezoidal axial section and a circular cross section. Figure 7 As shown, the inner sound channel 11 is filled with a porous block material 4, and the porous block material 4 is the porous block material prepared in Example 1.

[0071] A through sound pickup hole 31 is provided at the center of the PCB board 3. The PCB board 3 used in this embodiment is provided with a microphone.

[0072] The sound pickup hole 31, the inner sound channel 11 and the central cavity are connected in sequence. The diameters of the two ends of the inner sound channel 11 match the diameters of the sound pickup hole 31 and the central cavity respectively.

[0073] Test Example 1

[0074] This test example provides the test results of the effects of different porous block materials and channel structures on wind speed, please see Table 1 for details. The wind speed test uses the Xima AS8336 anemometer. Table 1 shows the wind speed test results after passing through porous block materials and different sound channel structures. Experiment 1 is the wind speed of the ambient wind after passing through a porous block material with unique impedance characteristics (porous block material of Example 1); Experiment 2 is the wind speed after passing through a porous block material with layered impedance characteristics (porous block material of Example 2); Experiment 3 is the wind speed after passing through the electronic device of Example 3 with a windmill-shaped external sound channel (not filled with porous block material); Experiment 4 is the wind speed after passing through the electronic device of Example 4 filled with the porous block material of Example 2 and the external sound channel is windmill-shaped; Experiment 5 is the wind speed after passing through the channel TWS earphone microphone (not filled with the porous block material of the present invention).

[0075] The specific structure of the TWS headset microphone used in Experiment 5 is as follows: the sound inlet component has a straight pipe, one end of the sound inlet component is open to form a sound inlet hole, and the other end of the sound inlet hole is connected to a sound absorbing cavity. The inside of the sound absorbing cavity is filled with foam to buffer and weaken the airflow, and the end of the sound absorbing cavity away from the sound inlet hole is the microphone's sound pickup hole. The main working principle of the TWS headset microphone is: the airflow generated by the wind passes through the sound inlet component, the sound inlet hole will weaken the airflow to a certain extent, and then the airflow can reach the microphone's sound pickup hole after being buffered and weakened by the sound absorbing cavity, which has a certain buffering effect on the wind noise signal.

[0076] Table 1 (wind speed unit: m / s)

[0077] Initial wind speed 5 4 3 2 1 Experiment 1 4 3.5 2 1 0.5 Experiment 2 3 2.5 2.2 1.8 0.6 Experiment 3 3 2 1 0.5 0.3 Experiment 4 0 0 0 0 0 Experiment 5 4.5 3.8 2.9 1.9 1

[0078] As can be seen from Table 1, the porous block material and the windmill-shaped external sound channel structure provided by the present invention can effectively reduce the wind speed. Compared with the porous block material with a single characteristic impedance, the porous block material with a layered characteristic impedance has a more obvious effect of reducing the wind speed. Furthermore, electronic equipment using both a windmill-shaped external sound channel structure and a porous block material with a layered impedance characteristic can almost completely eliminate the wind speed and eliminate wind noise.

Claims

1. A device capable of reducing wind noise, characterized in that: The device comprises an external sound channel, a zeolite material, and a sound pickup hole, wherein the zeolite material is arranged between the external sound channel and the sound pickup hole; ambient wind can enter the device through the external sound channel, contact the zeolite material, and then reach the sound pickup hole; The device is also provided with an inner sound channel, the sound pickup hole, the inner sound channel and the outer sound channel are connected in sequence, and the zeolite material is filled in the inner sound channel; The device also includes an arc-shaped cover, and the external sound channel is arranged inside the arc-shaped cover along the horizontal direction of the arc-shaped cover; The outer sound channel has a windmill-shaped structure as a whole, including a central cavity and a plurality of branch channels, the branch channels are radially arranged around the central cavity, the central cavity is connected to the inner sound channel, and each branch channel is a streamlined arc structure; One end opening of each branch channel is connected to the central cavity, and the other end opening is connected to the outside of the arc cover.

2. The device according to claim 1, characterized in that The zeolite material includes one or a combination of two or more of MFI structure molecular sieve, FER structure molecular sieve, CHA structure molecular sieve, MEL structure molecular sieve, TON structure molecular sieve, MTT structure molecular sieve and ZSM-5 molecular sieve.

3. The device according to claim 2, characterized in that The particle size of the zeolite material is 0.5 μm-10 μm.

4. The device according to claim 2, characterized in that The zeolite material includes micropores with a pore size of 0.3nm-0.7nm and mesopores with a pore size of 10nm-30nm.

5. The device according to claim 4, characterized in that The pore volume of the mesopores of the zeolite material accounts for 20-45% of the total pore volume of the zeolite material.

6. The device according to claim 5, characterized in that The pore volume of the mesopores of the zeolite material accounts for 25-35% of the total pore volume of the zeolite material.

7. The device according to claim 1, characterized in that The branch channels of the external acoustic channel are evenly distributed around the central cavity.

8. The device according to claim 1 or 7, characterized in that The device also includes a PCB board; the sound pickup hole is arranged at the center of the PCB board.

9. The device according to claim 8, characterized in that The device also includes a body, one end of which is connected to the PCB board, and the other end of which is connected to the arc-shaped cover, and an inner sound channel is arranged inside the body along the central axis of the body.

10. The device according to claim 9, characterized in that The body is a tubular structure.

11. The device according to claim 9, characterized in that The diameter of the port of the inner sound channel close to the outer sound channel matches the diameter of the central cavity.

12. The device according to claim 9, characterized in that The diameter of the port of the inner sound channel close to the PCB board is greater than or equal to the diameter of the sound pickup hole.

13. Use of the device capable of reducing wind noise according to any one of claims 1 to 12 in an electronic device having a microphone.

14. The use according to claim 13, wherein: The electronic device with a microphone includes a TWS headset.

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