POROUS BULK MATERIAL AND ELECTRONIC APPARATUS THEREOF, AND APPARATUS CAPABLE OF REDUCING WIND NOISE AND APPLICATION

Abstract

The present disclosure provides a porous bulk material and an electronic apparatus thereof, and an apparatus capable of reducing wind noise and an application thereof. The apparatus comprises an external sound channel, a zeolite material, and a sound pickup hole, wherein the zeolite material is disposed between the external sound channel and the sound pickup hole. The present disclosure further provides an application of the apparatus in an electronic device provided with a microphone. According to the apparatus, the wind noise can be effectively reduced, and the call quality of a communication device is obviously improved.

Claims

1. A porous bulky material characterized in that the raw material of the porous bulky material comprises zeolite, an adhesive and a dispersant, wherein the mass of the solid component of the adhesive is 1% to 20% of the mass of the zeolite, and the mass of the dispersant is 1% to 3% of the mass of the zeolite.

2. The porous bulky material according to claim 1, wherein the porous bulky material has a hierarchical porous structure; the porous bulky material comprises first-level pores with a pore size of 0.3 nm to 0.7 nm, second-level pores with a pore size of 10 nm to 50 nm and third-level pores with a pore size of 2 μm to 200 μm; the third-level pores include intergranular interstitial pores with a pore size of 2 μm to 10 μm and/or array macropores with a pore size of 10 μm to 200 μm; the pore volume of the intergranular interstitial pores is 1% to 5% of the pore volume of the third-level pores.

3. The porous bulky material according to claim 1, wherein the zeolite comprises one or a combination of two or more of an MFI structure molecular sieve, an FER structure molecular sieve, a CHA structure molecular sieve, an MEL structure molecular sieve, a TON structure molecular sieve, an MTT structure molecular sieve, and a ZSM-5 molecular sieve; the zeolite has a particle size of 0.5 μm to 10 μm; the zeolite comprises micropores with a pore size of 0.3 nm to 0.7 nm and mesopores with a pore size of 10 nm to 30 nm; the pore volume of the mesopores of the zeolite is 20% to 45% of the total pore volume of the zeolite; the pore volume of the mesopores of the zeolite is 25% to 35% of the total pore volume of the zeolite.

4. The porous bulky material according to claim 1, wherein the adhesive comprises an organic adhesive and/or an inorganic adhesive; the organic adhesive includes one or a combination of two or more of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polyethylvinyl acetate suspension and polybutadiene rubber suspension; the inorganic adhesive includes silica sol and/or alumina sol; the mass of the solid component of the adhesive is 5% to 15% of the mass of the zeolite; the dispersant includes one or a combination of two or more of ethanol, ethylene glycol, glycerin, sodium hexametaphosphate and sodium dodecylbenzenesulfonate.

5. The porous bulky material according to any one of claim 1, wherein the porous bulky material further comprises a pore-forming auxiliary agent and/or a reinforcing auxiliary agent; the mass of the pore-forming auxiliary agent is 0.5% to 5% of the mass of the zeolite; the pore-forming auxiliary agent includes one or a combination of two or more of ammonia water, hydrogen peroxide, ammonium chloride, ammonium nitrate, and the mass of the reinforcing auxiliary agent is 3% to 15% of the mass of the zeolite; the reinforcing auxiliary agent includes a fiber material; the fiber material includes chemical fibers and/or plant fibers, and the chemical fibers include inorganic fibers; the fibers in the fiber material have a diameter of 1 μm to 10 μm, and a length of 20 μm to 1 mm.

6. The porous bulky material according to any one of claim 1, wherein the porous bulky material is prepared by mixing the zeolite, the adhesive, and the dispersant to form a raw material suspension, and shaping the raw material suspension by one of extrusion, spray coating, casting and molding; the porous bulky material has a homogeneous characteristic impedance.

7. The porous bulky material according to any one of claim 1, wherein the porous bulky material is prepared by mixing the zeolite, the adhesive, and the dispersant to form a raw material suspension, and then evenly spreading the raw material suspension on fiber paper; the fiber paper includes one or a combination of two or more of polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyvinyl formal fiber, and PETT fiber; the thickness of the fiber paper is 50 μm to 200 μm, and the thickness of the fiber paper loaded with the raw material suspension is 100 μm to 600 μm; the fiber paper has macropores with a pore size of 10 μm to 100 μm; the prepared porous bulky material is a material having a characteristic impedance that varies from layer to layer.

8. An electronic device, comprising the porous bulky material according to any one of claim 1; the porous bulky material is filled in the electronic device for reducing wind noise; the electronic device has a microphone; the electronic device includes a TWS earphone.

9. A device capable of reducing wind noise, comprising a body, an arc cover and a PCB board; wherein the body is a tubular structure, one end of the body is connected to the PCB board, and the other end is connected to the arc cover, and an internal sound channel is arranged inside the body along the central axis; an external sound channel is arranged inside the arc cover along the horizontal direction, and the external sound channel has a pinwheel-like structure as a whole, including a central cavity and several branch channels arranged in a radial pattern around the central cavity, wherein the central cavity communicates with the internal sound channel, and each branch channel is a streamlined arc structure.

10. The device capable of reducing wind noise according to claim 9, wherein the branch channels of the external sound channel are evenly distributed around the central cavity; the diameter of each branch channel in the external sound channel gradually decreases from the outside to the inside of the device.

11. The device according to claim 9, wherein the center of the PCB board is provided with a pickup hole which communicates with the internal sound channel; the horizontal section of the internal sound channel is circular in shape; the axial section of the internal sound channel is rectangular or trapezoidal in shape.

12. The device according to claim 9, wherein the diameter of the port of the internal sound channel on the side close to the external sound channel matches the diameter of the central cavity; the diameter of the port of the internal sound channel on the side close to the PCB board is greater than or equal to the diameter of the pickup hole.

13. The device according to any one of claim 9, wherein the porous bulky material according to any one of claim 1 is filled in the internal sound channel; the porous bulky material has a characteristic impedance that varies from layer to layer, in the direction from the central cavity of the external sound channel to the PCB board; the characteristic impedance of the porous bulky material gradually increases in the direction from the central cavity of the external sound channel to the PCB board.

14. A device capable of reducing wind noise, comprising an external sound channel, a zeolite material, and a pickup hole, wherein the zeolite material is arranged between the external sound channel and the pickup hole; environmental wind can enter the device via the external sound channel, contact the zeolite material, and then reach the pickup hole.

15. The device according to claim 14, wherein the device is further provided with an internal sound channel, wherein the pickup hole, the internal sound channel, and the external sound channel communicates in this order, and the zeolite material is filled in the internal sound channel.

16. The device according to claim 14, wherein the zeolite material comprises one or a combination of two or more of an MFI structure molecular sieve, an FER structure molecular sieve, a CHA structure molecular sieve, an MEL structure molecular sieve, a TON structure molecular sieve, an MTT structure molecular sieve, and a ZSM-5 molecular sieve; the particle size of the zeolite material is 0.5 μm to 10 μm; the zeolite material comprises micropores with a pore size of 0.3 nm to 0.7 nm and mesopores with a pore size of 10 nm to 30 nm; the pore volume of the mesopores of the zeolite material is 20% to 45% of the total pore volume of the zeolite material; the pore volume of the mesopores of the zeolite material is 25% to 35% of the total pore volume of the zeolite material.

17. The device according to claim 15, wherein the device further comprises an arc cover, and the external sound channel is arranged inside the arc cover along the horizontal direction of the arc cover; the external sound channel has a pinwheel-like structure as a whole, including a central cavity and several branch channels arranged in a radial pattern around the central cavity, wherein the central cavity communicates with the internal sound channel, and each branch channel is a streamlined arc structure; the branch channels of the external sound channel are evenly distributed around the central cavity.

18. The device according to any one of claim 14, wherein the device further comprises a PCB board; and the pickup hole is arranged at the center of the PCB board.

19. The device according to any one of claim 14, wherein the device further comprises a body, wherein one end of the body is connected to the PCB board, and the other end is connected to the arc cover, and the internal sound channel is arranged inside the body along the central axis of the body; the body is a tubular structure; the diameter of the port of the internal sound channel on the side close to the external sound channel matches the diameter of the central cavity; the diameter of the port of the internal sound channel on the side close to the PCB board is greater than or equal to the diameter of the pickup hole.

20. Use of the device capable of reducing wind noise according to any one of claim 9 in an electronic device having a microphone; the electronic device having a microphone includes a TWS earphone.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0042] FIG. 1 is a schematic diagram of the third-stage pore distribution of the porous bulky material in Example 1.

[0043] FIG. 2 is an axis side drawing of the appearance of the device capable of reducing wind noise in Examples 3 to 5.

[0044] FIG. 3 is an axis side drawing of a section of the device capable of reducing wind noise in Examples 3 to 5.

[0045] FIG. 4 is an A-A sectional view of the device capable of reducing wind noise in Examples 3 and 4, where the porous bulky material is not shown.

[0046] FIG. 5 is a sectional view of the device capable of reducing wind noise in Examples 3 and 4, where the porous bulky material is shown.

[0047] FIG. 6 is an A-A sectional view of the device capable of reducing wind noise in Example 5, where the porous bulky material is not shown.

[0048] FIG. 7 is a sectional view of the device capable of reducing wind noise in Examples 5, where the porous bulky material is shown.

DESCRIPTION OF NUMERALS OF MAIN COMPONENTS

[0049] 1: body, 2: arc cover, 3: PCB board, 11: internal sound channel, 21: external sound channel, 211, 212, 213, 214: branch channels of the external sound channel, 31: pickup hole, 4: porous bulky material.

DETAILED DESCRIPTION OF EMBODIMENTS

[0050] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present disclosure, the technical solutions of the present disclosure will now be described below in details, but it should not be construed as limiting the implementable scope of the present disclosure.

[0051] In the description of the present disclosure, it should be understood that the terms “first” and “second” are used for illustrative purposes only, and cannot be interpreted as indicating or implying the relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with “first” and “second” may expressly or implicitly include one or more of such features. In the description of the present disclosure, “several” means two or more, unless specifically defined otherwise.

[0052] In a particular embodiment of the present disclosure, the porous bulky material may be a bulky material obtained by mixing a zeolite material powder, an adhesive, a dispersant (optionally further including a pore-forming auxiliary agent and/or a reinforcing auxiliary agent) to form a raw material suspension, shaping the raw material suspension by one of extrusion, spraying, casting, and molding, and then hot air drying or freeze drying; or may be a bulky material prepared by evenly dispersing the above-mentioned raw material suspension on a fiber paper.

[0053] In a specific embodiment of the present disclosure, the porous bulky material may be a material having multi-stage pores, generally including first-stage pores with a pore size of 0.3 nm to 0.7 nm, second-stage pores with a pore size of 10 nm to 50 nm and third-stage pores with a pore size of 2 μm to 200 μm. In some specific embodiments, the third-stage pores include intergranular interstitial pores with a pore size of 2 μm to 10 μm and/or array macropores with a pore size of 10 μm to 200 μm, and the pore volume of the intergranular interstitial pores may be 1 to 5% of the pore volume of the third-stage pores. The array macropores may be macropores formed by pressing with an array needle plate, which is a parallel needle plate formed by etching a silicon substrate, where the diameter of each needle is 10 μm to 200 μm, and the density of the array needles is 30 per square centimeter.

[0054] In the porous bulky material, the zeolite material may comprise 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, and MTT structure molecular sieve. The zeolite material may have a particle size of 0.5 μm to 10 μm, and it generally has micropores with a pore size of 0.3 to 0.7 nm and mesopores with a pore size of 10 to 30 nm. The pore volume of the mesopores is generally 20 to 45%, preferably 25 to 35% of the total pore volume of the zeolite material.

[0055] In the porous bulky material, the adhesive may be in the form of a suspension or a sol, and the mass of the solid component of the adhesive is generally controlled at 1% to 20%, preferably 5 to 15% of the mass of the zeolite material. The adhesive may comprise an organic adhesive and/or an inorganic adhesive. Herein, the organic adhesive may include one or a combination of two or more of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polyethylvinyl acetate suspension and polybutadiene rubber suspension, and the inorganic adhesive may include silica sol and/or alumina sol.

[0056] In the porous bulky material, the mass of the dispersant is generally controlled at 1% to 3% of the mass of the zeolite material. The dispersant may include one or a combination of two or more of ethanol, ethylene glycol, glycerin, sodium hexametaphosphate and sodium dodecylbenzenesulfonate.

[0057] In the porous bulky material, the auxiliary agent may include a pore-forming auxiliary agent and/or a reinforcing auxiliary agent. The pore-forming auxiliary agent can increase the pore volume of the porous bulky material, and the mass thereof is generally controlled at 0.5% to 5%, preferably 1% to 3% of the mass of the zeolite material. It generally includes one or a combination of two or more of ammonia water, hydrogen peroxide, ammonium chloride, ammonium nitrate, and sodium carbonate. The reinforcing auxiliary agent can improve the mechanical properties of the porous bulky material, and the mass thereof is generally controlled at 3% to 15%, preferably 5% to 10% of the mass of the zeolite material. The reinforcing auxiliary agent generally includes a fiber material, in which the fiber has a diameter of generally 1 μm to 10 μm, and a length of generally 20 μm to 1 mm. The fiber material may include a chemical fiber and/or a plant fiber, wherein the chemical fiber preferably includes an inorganic fiber.

Example 1

[0058] This example provides a porous bulky material, which is a bulky material prepared by a raw material suspension formed from a zeolite material, an adhesive, a dispersant, a pore-forming auxiliary agent and a reinforcing auxiliary agent, and has an overall homogeneous distribution of characteristic impedance. Herein, the zeolite material is a ZSM-5 molecular sieve with a particle size of 1.2 including micropores with an average pore size of 0.748 nm and mesopores with an average pore size of 14.39 nm, wherein the pore volume of mesopores is 29% of the total pore volume of the zeolite material. The adhesive is a polyacrylate suspension, and the mass there of is 9% of the mass of the zeolite material. The dispersant is glycerin, and the mass thereof is 1.5% of the mass of the zeolite. The pore-forming auxiliary agent is ammonia water, and the mass thereof is 2% of the mass of the zeolite material. The reinforcing auxiliary agent is glass fiber, and the mass thereof is 8% of the mass of the zeolite material.

[0059] In this example, the porous bulky material is specifically prepared by formulating 100 g of ZSM-5 powder, 100 g of water, 18 g of polyacrylate suspension with a solid content of 50%, 1.5 g of glycerin, 2 g of ammonia water, and 8 g of glass fiber into a homogeneous raw material suspension with ultrasonication for 3 min and stirring for 30 min, introducing the raw material suspension into a preformed mold, freezing at −40° C. for molding, sublimating under vacuum at low temperature, decomposing and dehydrating by heating, and forming pores by pressing the dehydrated molded product with an array needle plate, and demolding by pushing up the plate to prepare the porous bulky material.

[0060] The porous bulky material used in this example has a three-stages pore structure, including first-stage pores with a pore size of 0.748 nm, second-stage pores with a pore size of 14.27 nm, and third-stage pores with an average pore size of 67.9 Among them, the third-stage pores include intergranular interstitial pores (pores generated by grain packing) of 5.6 μm and array macropores with a pore size of 120 μm. The array macropores can be produced by the above-mentioned array needle plate, and the arrangement of the array macropores includes but is not limited to that shown in FIG. 1. The pore size of the intergranular interstitial pores of the porous bulky material may be measured by measuring the pore size of the porous bulky material avoiding the array macropores with a mercury porosimeter, before producing the array macropores in the porous bulky material with the array needle plate.

Example 2

[0061] This example provides a porous bulky material, which is a bulky material prepared by evenly dispersing a raw material suspension formed from a zeolite material, an adhesive, a dispersant and a pore-forming auxiliary agent on a fiber paper. Herein, the zeolite material is a ZSM-5 molecular sieve with a particle size of 1.2 μm, including micropores with an average pore size of 0.748 nm and mesopores with an average pore size of 14.39 nm, wherein the pore volume of mesopores is 29% of the total pore volume of the zeolite material. The adhesive is a polyacrylate suspension, and the mass there of is 7% of the mass of the zeolite material. The dispersant is glycerin, and the mass thereof is 1% of the mass of the zeolite material. The pore-forming auxiliary agent is ammonia water, and the mass there of is 2% of the mass of the zeolite material.

[0062] In this example, the porous bulky material is specifically prepared by formulating 100 g of ZSM-5 powder, 100 g of water, 14 g of polyacrylate suspension with a solid content of 50%, 1 g of glycerin and 2 g of ammonia water into a homogeneous suspension with ultrasonication for 3 min and stirring for 30 min, soaking the fiber paper in the slurry for 10 min, squeezing on a plate, freezing at −40° C. for shaping, sublimating under vacuum at low temperature, decomposing and dehydrating by heating, forming pores by pressing with an array needle plate, and demolding by pushing up the plate to prepare the porous bulky material. The porous bulky material thus formed has a characteristic impedance that varies from layer to layer.

[0063] The porous bulky material in this example has a three-stages pore structure, including first-stage pores with a pore size of 0.748 nm, second-stage pores with a pore size of 14.27 nm, and third-stage pores including macropores with a pore size of 10 μm to 100 μm contained in the fiber paper and macropores with a pore size of 80 μm formed by the array needle plate. In addition, the third-stage pores also include intergranular interstitial pores. However, because the macropores in the fiber paper used in this example play a major role in sound absorption, and the large pore size thereof interferes the measurement results for the pore sizes of the intergranular interstitial pores. Therefore, the specific pore size of the intergranular interstitial pores will not be described here.

Example 3

[0064] This example provides a device capable of reducing wind noise. FIG. 2 is an axis side drawing of the appearance of the device in this example, and the dotted line in FIG. 2 represents a perspective structure. FIG. 3 is an axial sectional view of the device in this example, FIG. 4 is a sectional view of the A-A plane in FIG. 3, and FIG. 5 is a schematic diagram of the structure of the device filled with the porous bulky material on the basis of FIG. 4.

[0065] As shown in FIGS. 2 to 5, the device includes a body 1, an arc cover 2 and a PCB board 3. The body 1 is a tubular structure, of which one end 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 at one end, which is the entity part of the device.

[0066] An external sound channel 21 with a pinwheel-like structure is provided inside the arc cover 2. The external sound channel 21 is composed 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 body 1 and the arc cover 2 are connected, and the branch channels 211, 212, 213, and 214 extend evenly and radially to the arc cover 2 with the central cavity as the center, that is, the opening at one end of each branch channel communicates with the central cavity, and the opening at the other end communicates with the outside of the arc cover 2. In the horizontal direction, each branch channel is approximately on the same plane. Each branch channel is a streamlined arc structure in shape, with the diameter gradually decreasing from the outside to the inside.

[0067] An internal sound channel 11 is provided inside the body 1 along the central axis, and the axial section of the internal sound channel 11 is rectangular and the cross section thereof is circular. As shown in FIG. 5, the internal sound channel 11 is filled with a porous bulky material 4, which is the porous bulky material prepared in Example 1.

[0068] The center of the PCB board 3 is provided with a through pickup hole 31. The PCB board 3 used in this example is provided with a microphone.

[0069] The pickup hole 31, the internal sound channel 11, and the central cavity communicate in this order. The diameter of the internal sound channel 11 is larger than the diameter of the pickup hole 31 and matches the diameter of the central cavity.

[0070] During the use of the device of this example, the environmental wind first enters the device from the port of each branch channel of the external sound channel 21 and has the speed reduced. The environmental wind having the speed preliminarily reduced continues to enter the internal sound channel 11 and contacts the porous bulky material 4. The porous structure in the porous bulky material 4 can further reduce the wind speed. When the speed of the environmental wind is reduced several times, the wind noise produced thereby is greatly reduced, so as to achieve the effect of improving the sound quality.

Example 4

[0071] This example provides a device capable of reducing wind noise. The structure of the device is basically the same as that of the device in Example 3, only except that the porous bulky material filled in the internal sound channel 11 is different. In this example, the porous bulky material prepared in Example 2, which has a characteristic impedance that varies from layer to layer, is used.

[0072] During the use of the device of this example, the environmental wind first enters the device from the port of each branch channel of the external sound channel 21 and has the speed reduced. The environmental wind having the speed preliminarily reduced continues to enter the internal sound channel 11 and contacts the porous bulky material 4. The porous structure in the porous bulky material 4 can further reduce the wind speed. Meanwhile, since the bulky body of the fiber paper has a characteristic impedance that varies from layer to layer from top to bottom (along the direction from the external sound channel 21 to the PCB board 3), before the environmental wind reaches the pickup hole 31, the wind noise generated by the environmental wind has been reduced from layer to layer, so as to achieve the effect of reducing the noise interference and improving the call quality.

Example 5

[0073] This example provides a device capable of reducing wind noise.

[0074] FIG. 2 is an axis side drawing of the appearance of the device in this example, and the dotted line in FIG. 2 represents a perspective structure. FIG. 6 is an axial sectional view of the device in this example, FIG. 4 is a sectional view of the A-A plane in FIG. 6, and FIG. 7 is a schematic diagram of the structure of the device filled with the porous bulky material on the basis of FIG. 6.

[0075] As shown in FIGS. 2, 4, 6 and 7, the device includes a body 1, an arc cover 2 and a PCB board 3. The body 1 is a tubular structure, of which one end 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 at one end, which is the solid part of the device.

[0076] An external sound channel 21 with a windmill-like structure is provided inside the arc cover 2. The external sound channel 21 is composed 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 body 1 and the arc cover 2 are connected, and the branch channels 211, 212, 213, and 214 extend evenly and radially to the arc cover 2 with the central cavity as the center, that is, the opening at one end of each branch channel communicates with the central cavity, and the opening at the other end communicates with the outside of the arc cover 2. In the horizontal direction, each branch channel is approximately on the same plane. Each branch channel is a streamlined arc structure in shape, with the diameter gradually decreasing from the outside to the inside.

[0077] An internal sound channel 11 is provided inside the body 1 along the central axis, and the axial section of the internal sound channel 11 is trapezoidal and the cross section thereof is circular. As shown in FIG. 7, the internal sound channel 11 is filled with a porous bulky material 4, which is the porous bulky material prepared in Example 1.

[0078] The center of the PCB board 3 is provided with a through pickup hole 31. The PCB board 3 used in this example is provided with a microphone.

[0079] The pickup hole 31, the internal sound channel 11, and the central cavity communicate in this order. The diameter of both ends of the internal sound channel 11 matches the diameter of the pickup hole 31 and the diameter of the central cavity in contact with it, respectively.

Test Example 1

[0080] This test example provides the test results of the influence of different porous bulky materials and channel structures on the wind speed. Refer to Table 1 for details. SIMA AS8336 anemometer is used for the wind speed test. Table 1 shows the wind speed test results after passing through the porous bulky materials and different sound channel structures.

[0081] Experiment 1 is the wind speed after the environmental wind passes through a porous bulky material with unique characteristic impedance (the porous bulky material in Example 1); Experiment 2 is the wind speed after the environmental wind passes through a porous bulky material with a characteristic impedance that varies from layer to layer (the porous bulky material in Example 2); Experiment 3 is the wind speed after the environmental wind passes through the device of Example 3 (not filled with a porous bulky material) having a pinwheel-like external sound channel; Experiment 4 is the wind speed after the environmental wind passes through the device of Example 4 having a pinwheel-like external sound channel and filled with the porous bulky material in Example 2; Experiment 5 is the wind speed that the environmental wind passes through the channel of the microphone of a TWS earphone (not filled with the porous bulky material of the present disclosure).

[0082] The specific structure of the microphone of the TWS earphone used in Experiment 5 is as follows: the sound inlet part has a linear channel, the opening at one end of the sound inlet part forms a sound inlet hole, and the other end of the sound inlet hole is connected to a sound-absorbing cavity, in which a foam is filled to buffer and weaken the airflow, and the end of the sound-absorbing cavity away from the sound inlet hole is the pickup hole of the microphone. The main working principle of the microphone of the TWS earphone is as follows: when the airflow generated by the wind passes through the sound inlet part, the sound inlet hole will weaken the airflow to a certain extent, and then the airflow will be buffered and weakened by the sound-absorbing cavity until reaching the pickup hole of the microphone, which produces a certain buffering effect on the noise signal.

TABLE-US-00001 TABLE 1 (wind speed: m/s) 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

[0083] It can be seen from Table 1 that the wind speed can be effectively reduced by filling the porous bulky material provided by the present disclosure and/or the pinwheel-like external sound channel structure; the porous bulky material with a characteristic impedance that varies from layer to layer can reduce the wind speed more significantly than the porous bulky material with unique characteristic impedance. Further, the wind speed can be nearly completely eliminated to remove the wind noise, by using the electronic device having a pinwheel-like external sound channel structure and the porous bulky material having a characteristic impedance that varies from layer to layer filled therein.