Wind noise suppression device and design method

Abstract

The present application discloses a wind noise suppression device, which is related to the field of wind noise processing and solves the problem of how to reduce wind noise caused by the impact of irregular airflow on a device. The wind noise suppression device (100) includes a first woven mesh (101), a second woven mesh (102), a device housing (103), and a structural part (104). The device housing (103) has a sound collection hole (1031). The first woven mesh (101) covers the sound collection hole (1031). The structural part (104) is disposed in the sound collection hole (1031). The structural part (104) is connected to the device housing (103) to form a cavity. The structural part (104) has an audio transmission hole (1041). The second woven mesh (102) covers the audio transmission hole (1041). A microphone is disposed in the audio transmission hole (1041). The structural characteristics of the sound collection hole (1031), the first woven mesh (101), the structural component (104) and the second woven mesh (102) can suppress the energy of wind noise, thereby effectively reducing the wind noise contained in the audio signal received by the microphone through the audio transmission hole (1041).

Description

[Technical field]

[0001] This application claims priority to Chinese Patent Application No. 202011567560.7, entitled “Wind Noise Suppression Device and Design Method,” filed with the China National Intellectual Property Office on December 25, 2020, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of wind noise processing, and more particularly to wind noise suppression devices and design methods. [Background technology]

[0003] Usually, when a user is in an environment with airflow and uses an electronic device with a microphone, the airflow hits the electronic device, resulting in the electronic device experiencing pressure fluctuations. The time-varying pressure fluctuations form wind noise. The microphone receives the wind noise signal, which is transmitted to the human ear through the speaker. As a result, noise is heard by the user. Currently, components configured to prevent the microphone diaphragm from being affected by relatively large sudden pressure changes are relatively ineffective against continuous pressure fluctuations with relatively low intensity caused by the flow of airflow, and cannot effectively suppress wind noise. Therefore, how to reduce wind noise caused by the impact of irregular airflow on electronic devices is an urgent problem to be solved. Summary of the Invention

[0004] The present application provides a wind noise suppression device and design method to solve the problem of how to reduce wind noise caused by the effect of irregular airflow on electronic equipment.

[0005] According to a first aspect, the present application provides a wind noise suppression device. The wind noise suppression device includes a first woven mesh, a second woven mesh, a device housing, a structural part, and a microphone. The device housing includes a sound collection hole, and the first woven mesh covers the sound collection hole. The first woven mesh is configured to reduce disturbances of the airflow in the device caused by airflow outside the device housing flowing into the device through the sound collection hole, and to reduce pressure fluctuations at the sound collection hole of the airflow in the device housing. The structural part is disposed at the sound collection hole, and the structural part communicates with the outside through the sound collection hole. The structural part is configured to propagate an audio signal captured at the sound collection hole. The structural part has a hollow structure, and the structural part is connected to the device housing to form a cavity. The cavity covers the sound collection hole, and a distance between the audio transmission hole and a plane on which the sound collection hole is located is equal to or greater than a preset threshold. The structural part includes an audio transmission hole. The microphone is configured to capture the audio signal. The second woven mesh covers the audio transmission hole. The second woven mesh is configured to reduce the effect of changes in airflow within the cavity on a diaphragm of a microphone connected to the sound transmission hole and to prevent the ingress of water and dust.

[0006] Usually, irregular airflow hits the wind noise suppression device, which generates wind noise. The wind noise suppression device captures an audio signal including wind noise through a sound collection hole. After the audio signal passes through the first woven mesh, the structural part, and the second woven mesh included in the wind noise suppression device, the wind noise energy can be suppressed due to the structural characteristics of the sound collection hole, the first woven mesh, the structural part, and the second woven mesh, so that the wind noise included in the audio signal received by the microphone through the sound transmission hole can be effectively reduced, thereby reducing the wind noise heard by the user, and improving the user experience when using the wind noise suppression device to capture audio.

[0007] The first woven mesh, the second woven mesh, the structural component, and the microphone are disposed within the device housing. The first woven mesh, the device housing, the structural component, the second woven mesh, and the microphone are stacked in order.

[0008] In a possible design, the structural part includes a cylindrical structure having openings at both ends, and a cover located at the opening at one end of the cylindrical structure, the cover having the sound transmission hole. The sound collection hole is a positive projection hole on the device housing of the opening at the other end of the cylindrical structure. In the Shadows It can be seen that the openings at the opposite ends of the structural components completely cover the sound collection holes, the radial size of which is less than or equal to the radial size of the hollow structure formed by the structural components.

[0009] In another possible design, a second woven mesh is clamped between the tubular structure and the cover.

[0010] In another possible design, the second woven mesh is clamped between the device housing and the structural component. It can be seen that the first woven mesh, the device housing and the second woven mesh form a first cavity, and the second woven mesh and the structural component form a second cavity. The second cavity covers the sound collection hole, and the height of the second cavity in a direction perpendicular to the plane in which the sound collection hole is located is equal to or greater than a preset threshold. The first woven mesh, the device housing, the second woven mesh, the structural component and the microphone are stacked in sequence.

[0011] The first woven mesh is a metal mesh, the mesh density of the first woven mesh is 300 mesh or more, and the impedance of the first woven mesh is 200 metric kilogram seconds Rayleigh (MKS reyls) or less. The second woven mesh is an acoustic mesh fabric, and the impedance of the second woven mesh is 200 MKS reyls or more.

[0012] In this embodiment, the woven mesh at the sound collection hole prevents the incoming airflow from entering the cavity and forming disturbances, thereby reducing the energy of the wind noise. In addition, the woven mesh at the sound collection hole has a rough surface, which can further reduce the intensity of the pressure fluctuation at the sound collection hole.

[0013] In another possible design, the wind noise suppression device further includes a third woven mesh, which is clamped between the device housing and the structural component. The third woven mesh is configured to reduce turbulence in the airflow in the device caused by airflow outside the device housing entering the device through the sound collection hole. It can be understood that the first woven mesh, the device housing, and the third woven mesh form a first cavity, the third woven mesh, the structural component, and the second woven mesh form a second cavity, the second cavity covers the sound collection hole, and the height of the second cavity in a direction perpendicular to the plane in which the sound collection hole is located is equal to or greater than a preset threshold. The second woven mesh can be clamped between the tubular structure and the cover. The first woven mesh, the device housing, the third woven mesh, the structural component, the second woven mesh, and the microphone are stacked in sequence.

[0014] In another possible design, the second woven mesh is clamped between the device housing and the structural component. The wind noise suppression device further includes a third woven mesh, the third woven mesh is clamped between the device housing and the second woven mesh. It can be seen that the first woven mesh, the device housing, the third woven mesh and the second woven mesh form a first cavity, and the third woven mesh, the second woven mesh and the structural component form a second cavity. The first woven mesh, the device housing, the third woven mesh, the second woven mesh, the structural component and the microphone are stacked in sequence.

[0015] The structural characteristics of the sound collection hole, the first woven mesh, the structural component, the second woven mesh and the third woven mesh can suppress the energy of wind noise, thereby effectively reducing the wind noise contained in the audio signal received by the microphone through the sound transmission hole, thereby reducing the wind noise heard by the user and improving the user experience when capturing sound by using electronic devices.

[0016] The first woven mesh and the third woven mesh are both metal meshes, and the mesh density of the first woven mesh is equal to or less than the mesh density of the third woven mesh, and the mesh density of the first woven mesh is equal to or less than 1000 mesh, and the mesh density of the third woven mesh is equal to or less than 1000 mesh. The second woven mesh is an acoustic mesh fabric, and the impedance of the second woven mesh is greater than or equal to 200 meters kilograms seconds Rayleigh MKSreyls.

[0017] In addition, the size of the sound collection hole is larger than the size of the sound transmission hole.

[0018] The preset threshold is determined based on the size of the sound collection hole. The preset threshold ranges from 1 to 30 mm.

[0019] The volume of the structural components in this embodiment is less than one cubic centimeter. In this way, the structural parts can be placed in miniaturized electronic devices to suppress wind noise.

[0020] In addition, the cavity of this embodiment may be further filled with foam material. The foam material is configured to reduce the turbulence of the airflow inside the device caused by the airflow outside the device housing entering the device through the sound collection hole. For example, at least one of the first cavity and the second cavity is filled with foam material. In this way, the foam material is used to further reduce the pressure fluctuations caused by the vortex and prevent large sudden changes in the flow field.

[0021] The wind noise suppression device further includes a sound guide tube, one end of the sound guide tube is connected to the sound transmission hole of the structural part, and the other end of the sound guide tube is connected to a microphone, which helps the microphone to receive the sound signal passing through the sound transmission hole.

[0022] According to a second aspect, the present application provides a headset. The headset includes a wind noise suppression device according to the first aspect. A sound collection hole of the headset is configured to capture a first audio signal. The first audio signal passes through a woven mesh and a structural component within the wind noise suppression device to obtain a second audio signal. Both the first audio signal and the second audio signal include valid audio signals. The wind noise energy contained in the second audio signal is less than the wind noise energy contained in the first audio signal.

[0023] According to a third aspect, the present application provides a method for designing a wind noise suppression device, the method including: calculating flow field information of a plurality of sampling points on a device housing of the wind noise suppression device according to any one of the above aspects using fluid dynamics based on a target wind speed, a target frequency, and an expected amount of wind noise reduction, the flow field information including a time change rate and a pressure fluctuation; determining a sampling point with the smallest pressure fluctuation within a target frequency range among the plurality of sampling points as a position of a sound collection hole on the device housing of the wind noise suppression device; and determining the target wind speed, the target frequency, the expected amount of wind noise reduction, and the dispersion relation of sound wave propagation in a cavity, the size of the sound collection hole, and the size of a cavity of a structural part included in the wind noise suppression device based on an eddy correlation length at the sound collection hole, the eddy correlation length being determined based on the time change rate and the pressure fluctuation. Therefore, since the sound collection hole of the device is enlarged and the structural parts and the woven mesh are installed in the device, the pressure fluctuation caused by the shear and impact of the vortex structure can be effectively reduced based on preventing wind gusts, so that the wind noise of the device can be reduced within the target frequency range and the sound quality and application range of the product can be improved. In addition, to achieve the same reduction in wind noise, the wind noise suppression device provided in this embodiment requires a smaller structural space, and for the same structural space, the applicability of the wind noise suppression device provided in this embodiment is higher and the amount of wind noise reduction is also larger. [Brief description of the drawings]

[0024] [Figure 1]1(a) and 1(b) are three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Diagram 2] 2(a) to 2(c) are two-dimensional and three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Diagram 3] 3(a) and 3(b) are three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Figure 4] FIG. 4 is a two-dimensional schematic diagram of a wind noise suppression device according to an embodiment of the present application. [Diagram 5] 5(a) and 5(b) are two-dimensional and three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Figure 6] 6(a) and 6(b) are three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Figure 7] FIG. 7 is a two-dimensional schematic diagram of a wind noise suppression device according to an embodiment of the present application. [Figure 8] 8(a) and 8(b) are two-dimensional and three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. [Figure 9] FIG. 9 is a schematic diagram of a vortex according to an embodiment of the present application. [Figure 10] FIG. 10 is a flowchart of a method for designing a wind noise suppression device according to an embodiment of the present application. [Figure 11] FIG. 11 is a schematic diagram of a headset according to the present application. [Figure 12] FIG. 12 is a schematic diagram of eddy correlation according to the present application. [Figure 13] FIG. 13 is a schematic diagram of the wind noise reduction effect of the wind noise suppression of the headset according to the present application. [Figure 14] 14(a) and 14(b) are two-dimensional schematic diagrams of a metal foam filled wind noise suppression device according to one embodiment of the present application. [Figure 15] FIG. 15 is a schematic diagram of the wind noise reduction effect of the wind noise suppression after the cavity is filled with metal foam material. [Figure 16]FIG. 16 is a three-dimensional schematic diagram of a wind noise suppression device connected to a microphone according to an embodiment of the present application. [Figure 17] FIG. 17 is a three-dimensional schematic diagram of a wind noise suppression device including a sound wave guide tube according to an embodiment of the present application. [Figure 18] FIG. 18 is a schematic diagram of the structure of the headset of the present application and a schematic diagram of the wind noise reduction effect of the wind noise suppression of the headset. [Figure 19] FIG. 19 is a schematic diagram of a configuration of a computer device according to the present application. [Figure 20] FIG. 20 is a schematic diagram of the configuration of another computer device according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The wind noise suppression device provided in the present application is applied to devices including, but not limited to, headset products, mobile phones, tablet computers, portable computers, wearable devices (watches, glasses, etc.) having functions such as a call function, a voice positioning function, and a noise reduction function. The specific form of the electronic device including the wind noise suppression device is not limited in the present application. When a user is in an environment where an external airflow flows, by using the wind noise suppression device, when an audio signal including wind noise is captured, the structural characteristics of the structural parts and the woven mesh included in the wind noise suppression device can suppress the energy of the wind noise, so that after the audio signal passes through the structural parts and the woven mesh, the energy of the wind noise included in the audio signal received by the microphone is smaller than the energy of the wind noise at the sound collection hole of the wind noise suppression device. Therefore, the wind noise suppression device provided in the present application can effectively reduce the wind noise caused by the impact of the irregular airflow on the device, thereby reducing the wind noise heard by the user, and improving the user experience when capturing audio by using the device. The environments in which a user captures sound using the wind noise suppression device and in which external airflow occurs include, but are not limited to, outdoor or indoor windy environments, a user walking environment, a user running environment, a user cycling environment, and the like.

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which an example in which the wind noise suppression device is a headset product is used for illustration.

[0027] 1(a) and 1(b) are three-dimensional schematic diagrams of a wind noise suppression device according to an embodiment of the present application. FIG. 1(a) is a three-dimensional partial cross-sectional view of the wind noise suppression device. As shown in FIG. 1(a), the wind noise suppression device 100 includes a first woven mesh 101, a second woven mesh 102, a device housing 103, and a structural member 104. The first woven mesh 101, the second woven mesh 102, and the structural member 104 are disposed inside the device housing 103. For ease of understanding, the device housing 103 shown in this embodiment is a part of the device housing of the wind noise suppression device 100. The device housing 103 includes a sound collection hole 1031. The sound collection hole 1031 is configured to capture an audio signal, i.e., sound. The first woven mesh 101 covers the sound collection hole 1031. The structural member 104 is disposed in the sound collection hole 1031. The structural member 104 communicates with the outside through the sound collection hole 1031. The structural member 104 includes a sound transmission hole 1041. The sound transmission hole 1041 is configured to transmit the sound signal of the wind noise suppression device 100 to a microphone connected to the sound transmission hole 1041. The second woven mesh 102 covers the sound transmission hole 1041. It can be seen that the sound collection hole 1031 is a hollow structure on the device housing 103. The sound transmission hole 1041 on the structural member 104 is a hollow structure. In addition, the specific shapes of the sound collection hole 1031 and the sound transmission hole 1041 are not limited in this embodiment. The size of the sound collection hole 1031 is larger than the size of the sound transmission hole 1041. In another explanation, the radial size of the sound collection hole 1031 is larger than the radial size of the sound transmission hole 1041. The radial direction is a linear direction along a diameter or a radius.

[0028] As shown in FIG. 1(b), the structural component 104 of this embodiment includes a cylindrical structure 1042 having openings at both ends, and a cover 1043 located at the opening at one end of the cylindrical structure. The cover 1043 has a sound transmission hole 1041. FIG. 1(b) is merely an example showing the structural component 104. In this embodiment, the specific shape of the cylindrical structure 1042 is not limited. The cylindrical structure 1042 may be a circular cylindrical structure or a square cylindrical structure.

[0029] It will be understood that the structural component 104 is a hollow structure. The structural component 104 is connected to the device housing 103 to form a cavity. Specifically, the first woven mesh 101, the device housing 103, the structural component 104, and the second woven mesh 102 form the cavity. The sound collection hole 1031 is an opening at the other end of the cylindrical structure 1042, and is connected to the positive reflector 104 on the device housing 103. In the Shadows In another explanation, the radial size of the sound collection hole 1031 is equal to or smaller than the radial size of the hollow structure formed by the structural component 104.

[0030] As an example, FIG. 1(b) is a three-dimensional schematic exploded view of a wind noise suppression device. As shown in FIG. 1(b), a first woven mesh 101, a device housing 103, a structural component 104, and a second woven mesh 102 are sequentially connected using an adhesive 105. That is, the first woven mesh 101 and the device housing 103 are connected using an adhesive 105, the device housing 103 and the structural component 104 are connected using an adhesive 105, and the structural component 104 and the second woven mesh 102 are connected using an adhesive 105. In this embodiment of the present application, the shape of the adhesive 105 is not limited, and the shape of the adhesive 105 shown in FIG. 1(b) is merely an example for explanation.

[0031] 2(a) is a partial two-dimensional schematic cross-sectional view of a wind noise suppression device. The first woven mesh 101 is disposed at the sound collection hole 1031 of the device housing 103. For example, the first woven mesh 101 can be glued to the position of the sound collection hole 1031 of the device housing 103 by using adhesive 105. The first woven mesh 101 is level with the outside of the device housing 103 to ensure that the shape of the device housing 103 is not affected by the sound collection hole. This is aesthetic and also avoids the effect of wind noise caused by the shape change of the device housing 103.

[0032] In addition, in this embodiment, the mesh structure of the first woven mesh 101 is not limited. As shown in Fig. 2(a), the first woven mesh 101 can be a planar mesh structure. Fig. 2(b) is a three-dimensional cross-sectional view of the wind noise suppression device. Fig. 2(c) is a two-dimensional cross-sectional view of the wind noise suppression device. As shown in Fig. 2(b) and Fig. 2(c), the first woven mesh 101 can be a strip-shaped mesh structure.

[0033] A three-dimensional cross-sectional view of the wind noise suppression device 100 can be obtained by dividing the headset 10 shown in Fig. 1(a) along the dashed line. The headset 10 includes the wind noise suppression device 100. In this embodiment, the x-direction is the direction from the position of the sound collection hole 1031 to the inside of the sound collection hole 1031, the y-direction is the flow direction of the airflow, and the y-direction is understood as the inflow direction of the airflow blowing toward the headset 10, and the z-direction is the direction pointing to the bottom of the headset. z represents the length of the sound collection hole 1031 in the z direction. y represents the length of the sound collection hole 1031 in the direction perpendicular to the z direction. x represents the distance between the sound transmission hole 1041 and the plane on which the sound collection hole 1031 is located, with the center point of the sound transmission hole 1041 as the reference point. It will be understood that when the sound transmission hole 1041 is disposed in the cover 1043 of the structural member 104 (as shown in FIG. 1(b)), if the size of the adhesive 105 in the figure is very small, the depth of the structural member 104 may be approximately equal to the distance between the sound transmission hole 1041 and the plane on which the sound collection hole 1031 is located. The depth and l of the structural member 104 shown in the accompanying drawings of this specificationx are merely examples for explanation, and are not limited thereto. Optionally, when the sound transmission hole 1041 is arranged on the side surface of the structural member 104, i.e., when the sound transmission hole 1041 is arranged in the cylindrical structure 1042 of the structural member 104, the depth of the structural member 104 may be equal to or greater than the distance between the sound transmission hole 1041 and the plane on which the sound collection hole 1031 is located. The distance between the sound transmission hole 1041 and the plane on which the sound collection hole 1031 is located is equal to or greater than a preset threshold. The preset threshold is determined based on the size of the sound collection hole 1031.

[0034] For example, as shown in FIG. 1(b), L1 represents the length of the structural member 104, and L2 represents the width of the structural member 104. y Larger than L2, L z Larger, l x is y and l z It can be understood that the hollow structure of the structural member 104 must completely cover the sound collection hole 1031. The size L3 of the sound transmission hole 1041 is smaller than the size lz of the sound collection hole 1031. For example, l x , l y , l z The value ranges from 1 to 30 millimeters (mm), and l z is about 4 mm, and l y is about 2 mm, and l x is about 6mm.

[0035] As shown in FIG. 2(a), the hole diameter l of the sound collection hole 1031 in the z direction is z is equal to the width L2 of the cavity of the structural member 104. Optionally, as shown in FIG. 2(b) and FIG. 2(c), the hole diameter l z is smaller than the width L2 of the cavity of the structural member 104.

[0036] The mesh density of the first woven mesh 101 is 300 mesh or more. That is, the first woven mesh 101 includes at least 300 mesh. The impedance of the first woven mesh is 200 metric kilogram-second Rayleigh (MKSreyls) or less. The first woven mesh 101 can be a woven mesh made of a hard material. For example, the first woven mesh 101 can be a metal mesh.

[0037] The second woven mesh 102 is disposed at the sound transmission hole 1041 of the structural component 104. For example, the second woven mesh 102 can be glued to the position of the sound transmission hole 1041 of the structural component 104 by using an adhesive. The second woven mesh 102 is an acoustic mesh fabric. The impedance of the second woven mesh 102 is 200 MKSreyls or more.

[0038] In this embodiment, the weaving method of the described woven mesh is not limited, and the weaving method can be plain weave, twill weave, etc.

[0039] The device housing 103 and structural components 104 may be made of any material, including but not limited to, for example, the material may be a variety of composite plastic materials.

[0040] The first woven mesh 101 is configured to reduce turbulence in the airflow inside the device caused by airflow outside the device housing 103 entering the device through the sound collection hole 1031, and to reduce pressure fluctuations in the airflow outside the device housing 103 at the sound collection hole 1031.

[0041] The second knitted mesh 102 is configured to reduce the effect of airflow changes within the cavity of the structural component 104 on the diaphragm of a microphone connected to the sound transmission hole 1041 and to prevent the ingress of water and dust.

[0042] The structural component 104 is configured to propagate an audio signal that is picked up by the sound collection hole 1031 .

[0043] In this embodiment of the present application, the knitted mesh at the sound collection hole is used to reduce the energy of wind noise by preventing the flowing airflow from entering the cavity and forming disturbances. In addition, the knitted mesh at the sound collection hole has a rough surface, which can further reduce the intensity of the pressure fluctuation at the sound collection hole.

[0044] In this embodiment, the tubular structure 1042 included in the structural member 104 and having openings at both ends, and the cover 1043 located at the opening at one end of the tubular structure, may be designed as a whole or may be two separate structures.

[0045] In some other embodiments, as shown in Fig. 3(a) and Fig. 3(b), the difference between the wind noise suppression device 100 and that of Fig. 1(a) and Fig. 1(b) is that the second woven mesh 102 is clamped between the tubular structure 1042 and the cover 1043. It can be seen that the first woven mesh 101, the device housing 103, the tubular structure 1042, the second woven mesh 102 and the cover 1043 are stacked in sequence. The second woven mesh 102 is separately connected to the tubular structure 1042 and the cover 1043 by using an adhesive 105. The hollow structure formed by the cover 1043, the second woven mesh 102 and the tubular structure 1042 communicates with the sound collection hole 1031. Fig. 4 is a partial two-dimensional cross-sectional view of the wind noise suppression device.

[0046] The location of the second woven mesh 102 in the wind noise suppression device 100 is not limited to this embodiment of the present application, and the second woven mesh 102 may alternatively be located in another location.

[0047] As shown in FIG. 5(a), the difference between the wind noise suppression device 100 and those in FIG. 1(a), FIG. 1(b), and FIG. 2(a)-FIG. 2(c) is that the second woven mesh 102 is clamped between the device housing 103 and the structural member 104. The second woven mesh 102 is separately connected to the device housing 103 and the structural member 104 by using an adhesive 105. The first woven mesh 101, the second woven mesh 102, and the device housing 103 form a first cavity. The second woven mesh 102 and the structural member 104 form a second cavity. FIG. 5(b) is a two-dimensional cross-sectional view of the wind noise suppression device. The first cavity and the second cavity in this embodiment constitute the cavity formed by connecting the structural member to the device housing in the claims.

[0048] In another possible design, when the mesh density of the first woven mesh 101 is relatively low (e.g., the mesh density of the first woven mesh 101 is less than 300 meshes), i.e., when the mesh number of the first woven mesh 101 is relatively small, a woven mesh may be further added to the wind noise suppression device to further reduce the turbulence of the airflow inside the device caused by the airflow outside the device housing entering the device through the sound collection hole 1031. As shown in Fig. 6(a) and Fig. 6(b), the difference between the wind noise suppression device 100 and that in Fig. 5(a) is that the wind noise suppression device 100 further includes a third woven mesh 106. The third woven mesh 106 is clamped between the device housing 103 and the second woven mesh 102. The third woven mesh 106 is separately connected to the device housing 103 and the second woven mesh 102 by using an adhesive 105. For example, the third woven mesh 106 is bonded to the device housing 103 by using adhesive 105, and is bonded to the second woven mesh 102 by using adhesive 105. The second woven mesh 102 is bonded to the cylindrical structure 1042 by using adhesive 105, and is bonded to the third woven mesh 106 by using adhesive 105. The first woven mesh 101, the device housing 103, the third woven mesh 106, the second woven mesh 102, and the structural component 104 are stacked in sequence. The first woven mesh 101, the device housing 103, the third woven mesh 106, and the second woven mesh 102 form a first cavity. The third woven mesh 106, the second woven mesh 102, and the structural component 104 form a second cavity. FIG. 7 is a two-dimensional cross-sectional view of the wind noise suppression device.

[0049] In another possible design, as shown in FIG. 8(a), the difference between the wind noise suppression device 100 of FIG. 6(a), FIG. 6(b) and FIG. 7 is that the second woven mesh 102 is clamped between the tubular structure 1042 and the cover 1043, and the third woven mesh 106 is clamped between the device housing 103 and the tubular structure 1042. For example, the second woven mesh 102 is bonded to the tubular structure 1042 and the cover 1043 by using adhesive 105. The third woven mesh 106 can be bonded to the device housing 103 and the tubular structure 1042 by using adhesive 105. The first woven mesh 101, the device housing 103, the third woven mesh 106, the tubular structure 1042, the second woven mesh 102 and the cover 1043 are stacked in sequence. The first woven mesh 101, the third woven mesh 106, and the device housing 103 form a first cavity. The second woven mesh 102, the third woven mesh 106, the cylindrical structure 1042, and the cover 1043 form a second cavity. Figure 8(b) is a two-dimensional cross-sectional view of the wind noise suppression device.

[0050] In another possible design, a tubular structure 1042, which is included in the structural component 104 and has openings at both ends, and a cover 1043 located at the opening at one end of the tubular structure can be designed as a whole. The second woven mesh 102 covers the sound transmission hole 1041. The third woven mesh 106 is clamped between the device housing 103 and the tubular structure 1042. The third woven mesh 106 can be bonded to the device housing 103 by using adhesive 105 and to the tubular structure 1042 by using adhesive 105.

[0051] The mesh density of the first woven mesh 101 is equal to or less than the mesh density of the third woven mesh 106. For example, the mesh density of the first woven mesh 101 is equal to or less than 1000 mesh, and the mesh density of the third woven mesh 106 is equal to or less than 1000 mesh.

[0052] In addition, the material hardness of the third woven mesh 106 is lower than the material hardness of the first woven mesh 101. The third woven mesh 106 can also be a metal mesh.

[0053] The volume of the structural component 104 in this embodiment is less than one cubic centimeter. Thus, the structural component 104, the first woven mesh 101, the second woven mesh 102 and the third woven mesh 106 can be arranged in a miniaturized wind noise suppression device to suppress wind noise.

[0054] The main source of wind noise is related to vortex shedding and vortex impact on the headset structure surface. The main sources of vortex generation are wind atmospheric turbulence, unstable flow due to surface curvature, flow disturbance due to pinna, head, etc. Due to the characteristics that the number of waves of pressure fluctuations caused by vortex is relatively large, large sound collection holes and cavity structures can be used to reduce the propagation of wind noise energy in the headset cavity and reduce the wind noise energy at the sound transmission hole.

[0055] FIG. 9(a) is a schematic diagram of vortices near the head in the case of uniform airflow. FIG. 9(b) is a schematic diagram of vortices near the head in the case of non-uniform airflow. Non-uniform airflow can be generated when the airflow collides with an object such as a face, a headset, or an ear. When the non-uniform airflow collides with an object such as a face, a headset, or an ear, pressure fluctuations are generated, resulting in wind noise.

[0056] The embodiment of the present application further provides a method for designing a wind noise suppression device. In order to suppress wind noise by using the appearance of the wind noise suppression device and the structural characteristics of the wind noise suppression device, and to reduce the wind noise entering human ears as much as possible, the size of the sound collection hole of the wind noise suppression device and the size of the cavity of the wind noise suppression device are designed, optimized, and adjusted based on the target wind speed, the target frequency, the expected wind noise reduction amount, and the flow field information near the wind noise suppression device. The target wind speed represents the speed of the airflow that forms the wind noise. The range of the target wind speed is 10 m / s or less. In this embodiment, the target wind speed is assumed to be 3 m / s. The target frequency represents the frequency of the airflow that forms the wind noise. The target frequency range represents the frequency range of the wind noise output by the device and to which the human ear is sensitive. In this embodiment, the target frequency range is assumed to be 100 Hertz (Herz, Hz) to 1000 Hertz. The expected wind noise reduction amount represents the amount by which the energy of the wind noise is reduced from the sound collection hole to the sound transmission hole. The expected wind noise reduction amount may be 3 dB. Here, the wind noise suppression device is the wind noise suppression device 100 of any one of the above-mentioned embodiments, and the wind noise suppression device may be a headset. As shown in FIG. 10, the method includes the following steps.

[0057] S1001: Calculate flow field information of multiple sampling points on a device housing of a wind noise suppression device using fluid dynamics based on a target wind speed, a target frequency, and an expected amount of wind noise reduction.

[0058] A three-dimensional model of a headset worn by a user may be designed in advance to simulate the case where the user is in an environment with airflow. FIG. 11(a) is a schematic diagram of the three-dimensional model of a headset worn by a user. FIG. 11(b) shows a headset with multiple sampling points arranged. Flow field information of the multiple sampling points on the headset is calculated using fluid dynamics. The flow field information includes time-varying velocity, density, and pressure fluctuation. Wind noise is the time-varying pressure fluctuation of the airflow at the sampling points.

[0059] S1002: Among the multiple sampling points, the sampling point with the smallest pressure fluctuation within the target frequency range is determined as the position of the sound collection hole on the device housing of the wind noise suppression device.

[0060] In the case of the headset design shown as an example in Fig. 11(c), the external design of the headset is not changed, and the sound collection hole is placed at the rear of the headset near the auricle, for example, at the position indicated by the arrow in Fig. 11(c), which can be found through testing to effectively reduce the pressure fluctuation caused by vortex shock and experienced by the microphone, that is, to reduce the wind noise energy at the microphone's acoustic transmission hole. For example, when the sound collection hole is located at the position where the internal angle between the inflow and the head axis is 0, the wind noise suppression effect is strongest.

[0061] Also, by increasing the area of ​​the sound collection hole, the pressure fluctuations are offset over a relatively wide range, resulting in a better wind noise suppression effect. Step S1003 is performed.

[0062] S1003: Based on the eddy correlation length at the sound collection hole, a target wind speed, a target frequency, an expected amount of wind noise reduction and a dispersion relationship of sound wave propagation in the cavity, a size of the sound collection hole, and a size of the cavity of a structural part included in the wind noise suppression device are determined.

[0063] The size of the structural part includes the depth of the structural part. The size of the sound collection hole is the length of the sound collection hole in the z direction l z and the length of the sound collection hole in the direction perpendicular to the z direction, l y The target frequency is selected as f1, the target wind speed is U, and the airflow direction is toward the person's face. The equivalent wavelength in the vortex state is λ y =U / f1. Due to space limitations caused by stacking of internal elements, the length of the sound collection hole in the y direction (shown in Figure 1(a)) is l y and the equivalent wave number in the y direction is [Outside 1] TIFF0007648042000001.tif19170. The dispersion relation for sound wave propagation in a cavity satisfies equation (1).

[0064]

number

[0065] Here, c represents the speed of sound, and ω1=2πf1,k x represents the equivalent wave number in the x direction, and k z represents the equivalent wave number in the z direction, and k y represents the equivalent wave number in the y direction. In order to effectively prevent the surface pressure fluctuations of the device housing from propagating into the cavity, [Outside 2] TIFF0007648042000003.tif18170. Equation (2) can be obtained from equation (1).

[0066]

number

[0067] From Fig. 12, at the target frequency f1, the boundary between high and low correlation in the positive z direction is approximately l x In addition, the flow analysis shows that interference between the sound collection hole and the end flow is likely to occur in the -z direction (opposite to the z direction). Therefore, the wavelength of the vortex in the z direction is f1, which is approximately l y The distance between the sound collection holes in the z direction is l z It can be seen that satisfies (3).

[0068]

number

[0069] The length of the sound collection hole in the z direction that satisfies the requirements is l z and the length of the sound collection hole in the y direction that satisfies the requirements is l y The size of the internal cavity in the y direction, L1, is the size of the sound collection hole, l y The size of the internal cavity in the z direction, L2, should be greater than the size of the sound collection hole, l zIf the expected wind noise reduction is 3 dB at f2, i.e., the wind noise energy is reduced by 50%, then equation (4) needs to be satisfied in the x-direction of the cavity.

[0070]

number

[0071] At the target wind speed U, the corresponding eddy correlation boundary length at the target frequency f2 is l2. In this case, k x satisfies equation (5).

[0072]

number

[0073] In this way, the distance l between the sound transmission hole 1041 and the plane where the sound collection hole 1031 is located is x The depth of the cavity in the structural component can be calculated by the following formula: x That's all.

[0074] The size of the structural component included in the wind noise suppression device is equal to or larger than the size of the sound collection hole. The size of the structural component includes the length, width and depth of the structural component.

[0075] If at least one of the size of the sound collection hole and the size of the structural component obtained by calculation is larger than the space inside the wind noise suppression device, parameters such as the device design, internal spatial layout, target frequency, and expected amount of wind noise reduction are newly adjusted, and steps S1001 to S1003 are performed.

[0076] In this way, the area of ​​the sound collection hole is increased by using the correlation length of vortices with different frequencies in the z direction perpendicular to the inflow direction, so that the pressure fluctuations are offset over a relatively large area, and a better wind noise suppression effect is obtained. In this embodiment, the wind noise is suppressed by improving and optimizing the semi-open headset structure design.

[0077] 13 is a schematic diagram of the wind noise suppression effect of the headset according to this embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents the sound pressure level (SPL) of wind noise or wind noise. From this figure, it can be seen that the headset provided in this embodiment of the present application has a relatively large wind noise reduction amount of the wind noise suppression in the target frequency range of 100Hz to 1000Hz compared to the conventional headset, and the wind noise reduction amount frequency range can reach 3000Hz and the wind noise reduction amount can reach 10dB.

[0078] Therefore, by enlarging the sound collection hole of the headset and installing the structural member and the woven mesh in the headset, the pressure fluctuation caused by the shear and impact of the vortex structure can be effectively reduced based on preventing wind gusts, so that the wind noise of the headset in the target frequency range is reduced, and the sound quality and application range of the product are improved. In addition, to achieve the same wind noise reduction, the required structural space is smaller, and for the same structural space, the applicability of the headset provided in the embodiment of the present application is higher, and the amount of wind noise reduction is greater.

[0079] In some other embodiments, the cavity of the wind noise suppression device may be further filled with foam. For example, as shown in FIG. 14(a), the cavity formed by the first woven mesh 101, the second woven mesh 102, the device housing 103 and the structural component 104 may be further filled with foam 107. The foam 107 may be a perforated foam having hydrophobic properties. For example, the foam 107 may be a metal foam. Alternatively, a material such as polyester foam may be selected as the foam 107. The acoustic impedance of the foam 107 is less than 200 MKSreyls. The foam 107 has hydrophobic properties. In this way, the flow effect of the airflow in the cavity is further reduced, which helps reduce the wind noise.

[0080] In some other embodiments, as shown in FIG. 14(b), the first cavity may be filled with foam to maximize wind noise reduction. The second cavity may also be filled with foam. The first and second cavities may be filled with the same or different foam materials. The foam is configured to reduce turbulence in the airflow inside the device caused by airflow outside the device housing entering the device through the sound collection hole 1031.

[0081] Figure 15 is a schematic diagram of the wind noise reduction effect of the wind noise suppression after the cavity is filled with metal foam material. It can be seen from this figure that an additional wind noise reduction effect of 2 to 3 decibels (dB) can be obtained in the full range of 200Hz to 2000Hz by filling the cavity with metal foam material, compared to the case where the cavity is not filled with metal foam material. Thus, foam material is used to further reduce the pressure fluctuations caused by vortices and prevent cases where the flow field changes significantly and suddenly.

[0082] 16, the microphone 108 is disposed in the audio transmission hole 1041 of the structural member 104, so that the microphone 108 receives audio transmitted through the audio transmission hole 1041. The microphone 108 may be connected to the structural member 104 by using an adhesive 105. The microphone 108 may include a housing and a printed circuit board (PCB). The PCB board has an audio transmission hole. The size of the audio transmission hole on the PCB board is smaller than the size of the audio transmission hole 1041.

[0083] In some other embodiments, due to limitations in the size of the structural parts or limitations in the spatial location of the parts, or due to elimination of certain acoustic modes, acoustic resonance effects, etc., there may be different shapes of sound guide tubes between the microphone 108 and the sound transmission hole 1041 of the structural part 104. The sound guide tube may also be called a sound guide tube. As shown in (a) of FIG. 17, a sound guide tube 109 is disposed between the microphone 108 and the sound transmission hole 1041 of the structural member 104. One end of the sound guide tube 109 is connected to the sound transmission hole 1041 of the structural member 104, and the other end of the sound guide tube 109 is connected to the microphone 108. (b) of FIG. 17 shows possible shapes of the sound guide tube 109.

[0084] In some other embodiments, the exterior design may be further optimized to improve wind noise suppression capabilities.

[0085] As shown in (a) of FIG. 18, for example, the side appearance of the headset is a flat water drop shape, with the upper appearance part being larger and the lower appearance part being smaller. The appearance line is soft, so there is less interference with the flow. The water drop design is easy to fit to the face and helps to avoid vortexes. The sound collection hole is located on the upper rear side of the headset to maximize the effect of blocking the flow of the pinna. The length in the y direction is relatively large, so it can reduce the pressure fluctuation caused by the front vortex.

[0086] As another example, the side profile of the headset is arched. The sound collection hole is located behind the arch of the headset. The flow is blocked by using the pinna and the arch. The length in the y direction is relatively large, which can reduce the pressure fluctuation caused by the front vortex.

[0087] FIG. 18(b) is a schematic diagram of the wind noise reduction effect of the wind noise suppression of a headset according to an embodiment of the present application, in which the side shape of the headset is a flat water drop shape. The horizontal axis represents frequency, and the vertical axis represents wind noise pressure level or wind noise. From this figure, it can be seen that the headset provided in this embodiment of the present application has a relatively large wind noise reduction amount of the wind noise suppression in the target frequency range of 100Hz to 1000Hz compared to the conventional headset, and the wind noise reduction amount frequency range exceeds 3000Hz, and the wind noise reduction amount can reach 14dB to 15dB.

[0088] It should be understood that the structures shown in the embodiments do not constitute any particular limitation on the headset. In addition to the structural parts, the knitted mesh, and the microphone, the headset may further include more or fewer components (e.g., a speaker and a processor), may combine some components, may split some components, or may have a different component arrangement. The components shown may be implemented by hardware, software, or a combination of software and hardware.

[0089] It is understood that in order to implement the functions in the method for designing a wind noise suppression device in the above embodiments, the computer device includes corresponding hardware structures and / or software modules to perform each function. Those skilled in the art can easily recognize that the present application can be implemented by using hardware or a combination of hardware and computer software in combination with the units and method steps in the examples described in the embodiments disclosed herein. Whether the functions are implemented by using hardware or hardware driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0090] 19 and 20 are schematic diagrams of possible computer device structures according to the embodiments of the present application, which may be configured to implement the functions of the computer device in the above method embodiments, and thus obtain the beneficial effects of the above method embodiments.

[0091] 19, a computing device 1900 includes a processing module 1910 and a communication module 1920. The computing device 1900 is configured to perform the functions of the computing device in the embodiment of the method shown in FIG.

[0092] When computing device 1900 is configured to perform the functions of the computing device in the method embodiment shown in FIG. 10, processing module 1910 is configured to perform S1001-S1003, and communication module 1920 is configured to receive data necessary to perform S1001-S1003, e.g., target wind speed, target frequency, expected amount of wind noise reduction, etc.

[0093] For a more detailed description of the processing module 1910, please directly refer to the relevant description in the embodiment of the method shown in Figure 10. The details will not be described again here.

[0094] As shown in Fig. 20, the computing device 2000 includes a processor 2010 and an interface circuit 2020. The processor 2010 and the interface circuit 2020 are coupled to each other. It will be understood that the interface circuit 2020 may be a transceiver or an input / output interface. Optionally, the computing device 2000 may further include a memory 2030 configured to store instructions executed by the processor 2010, to store input data required for the processor 2010 to execute the instructions, or to store data generated after the processor 2010 executes the instructions.

[0095] When the computing device 2000 is configured to perform the method shown in FIG. 10 , the processor 2010 is configured to perform the functions of the processing module 1910 and the interface circuitry 2020 is configured to perform the functions of the communication module 1920.

[0096] The processor in this embodiment of the present application may be a central processing unit (CPU) or other general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), or other. ASIC, Field Programmable Gate Array It will be appreciated that the general purpose processor may be a programmable gate array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor or any conventional processor.

[0097] The method steps in the embodiments of the present application may be implemented by using hardware or by a processor executing software instructions. The software instructions may include corresponding software modules. The software modules may be implemented in a variety of memory types, including random access memory (RAM), flash memory, read-only memory (ROM), and the like. The information may be stored in a programmable read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium known in the art. An example of a storage medium is coupled to a processor such that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may alternatively be a component of the processor. The processor and the storage medium may be located in an ASIC. In addition, the ASIC may be located in a network device or a terminal device. Of course, the processor and the storage medium may alternatively exist as separate components in a network device or a terminal device.

[0098] In the embodiments of the present application, unless otherwise specified or there is no logical contradiction, the terms and / or descriptions between different embodiments are consistent and may be cross-referenced, and the technical features in different embodiments may be combined into a new embodiment based on their internal logical relationships.

[0099] It can be understood that various numbers in the embodiments of the present application are merely intended to distinguish for ease of description, and are not intended to limit the scope of the embodiments of the present application. The numbers of the above process sequences do not mean the execution sequence, and the execution sequence of the processes should be determined based on the functions and internal logic of the processes.

Claims

1. A wind noise suppression device, the wind noise suppression device including a first woven mesh, a second woven mesh, a device housing, a structural component, and a microphone, the first woven mesh, the second woven mesh, the structural component, and the microphone being disposed within the device housing; The device housing has a sound collection hole, The first woven mesh covers the sound collection hole, and the first woven mesh is configured to reduce an inflow of an external airflow; The structural component is disposed in the sound collection hole, The structural part has a hollow structure, the structural part has a sound transmission hole, the structural part communicates with the outside through the sound collection hole, the structural part is connected to the device housing to form a cavity, the cavity covers the sound collection hole, and a distance between the sound transmission hole and a plane on which the sound collection hole is located is equal to or greater than a preset threshold determined based on the size of the sound collection hole; The microphone is disposed in the sound transmission hole, and the microphone is configured to capture a sound signal; The second woven mesh is configured to cover the sound transmission hole, and the second woven mesh is configured to protect the microphone.

2. 2. The wind noise suppression device according to claim 1, wherein the structural component includes a tubular structure having openings at both ends, and a cover located at the opening at one end of the tubular structure, the cover having the sound transmission hole.

3. The wind noise suppression device according to claim 2 , wherein the sound collection hole is covered by an orthogonal projection of an opening at the other end of the cylindrical structure onto the device housing.

4. 4. The wind noise suppression device according to claim 2, wherein the second woven mesh is clamped between the tubular structure and the cover.

5. 4. The wind noise suppression device of claim 2 or 3, wherein the second woven mesh is clamped between the device housing and the structural component.

6. 6. The wind noise suppression device according to claim 1, wherein the first woven mesh is a metal mesh, the mesh density of the first woven mesh is 300 mesh or more, and the impedance of the first woven mesh is 200 meter-kilogram-second Rayleigh (MKS reyls) or less.

7. 5. The wind noise suppression device according to claim 1, further comprising a third woven mesh, the third woven mesh being clamped between the device housing and the structural component, the third woven mesh being configured to reduce turbulence in the airflow within the wind noise suppression device caused by airflow outside the device housing flowing into the wind noise suppression device through the sound collection hole.

8. 5. The wind noise suppression device according to claim 1, further comprising a third woven mesh, the third woven mesh being clamped between the device housing and the second woven mesh, the third woven mesh being configured to reduce turbulence in the airflow within the wind noise suppression device caused by airflow outside the device housing flowing into the wind noise suppression device through the sound collection hole.

9. 9. The wind noise suppression device according to claim 7 or 8, wherein the first woven mesh and the third woven mesh are both metal meshes, the mesh density of the first woven mesh is equal to or less than the mesh density of the third woven mesh, the mesh density of the first woven mesh is equal to or less than 1000 mesh, and the mesh density of the third woven mesh is equal to or less than 1000 mesh.

10. 10. The wind noise suppression device of claim 1, wherein the second woven mesh is an acoustic mesh fabric, and the impedance of the second woven mesh is greater than or equal to 200 meter-kilogram-second Rayleighs (MKS reyls).

11. A wind noise suppression device according to any one of the preceding claims, wherein the preset threshold value ranges from 1 to 30 mm.

12. The wind noise suppression device according to claim 1 , wherein the size of the sound collection hole is larger than the size of the sound transmission hole.

13. 13. A wind noise suppression device as claimed in any preceding claim, wherein the volume of the structural component is less than one cubic centimeter.

14. 14. A wind noise suppression device as claimed in any one of claims 1 to 13, wherein the cavity is filled with a foam material, and the foam material is configured to reduce turbulence of the airflow inside the wind noise suppression device caused by airflow outside the device housing flowing into the wind noise suppression device through the sound collection hole.

15. The wind noise suppression device according to any one of claims 1 to 14, further comprising a sound guide tube, one end of the sound guide tube being connected to a sound transmission hole of the structural part, and the other end of the sound guide tube being connected to the microphone.

16. 16. A headset comprising a wind noise suppression device according to any one of claims 1 to 15, a sound collection hole of the headset configured to capture a first audio signal, the first audio signal passing through a woven mesh and structural components within the wind noise suppression device to obtain a second audio signal, both the first audio signal and the second audio signal comprising valid audio signals, and the wind noise energy contained in the second audio signal being less than the wind noise energy contained in the first audio signal.

17. 1. A method for designing a wind noise suppression device, comprising the steps of: Calculating flow field information of a plurality of sampling points on a device housing of the wind noise suppression device according to any one of claims 1 to 15 using fluid dynamics based on a target wind speed, a target frequency and an expected amount of wind noise reduction, the flow field information including a time-varying velocity and a pressure fluctuation; determining, among the plurality of sampling points, a sampling point having the smallest pressure fluctuation within a target frequency range as a position of a sound collection hole on a device housing of the wind noise suppression device; determining the target wind speed, the target frequency, the expected wind noise reduction amount and a dispersion relationship of sound wave propagation in a cavity, the size of the sound collection hole, and the size of a cavity of a structural part included in the wind noise suppression device based on an eddy correlation length at the sound collection hole, the eddy correlation length being determined based on the time change rate and the pressure fluctuation; A method for designing a wind noise suppression device comprising:

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