Microphone array and microphone device

Abstract

The application provides a microphone array board and a microphone device, wherein the microphone array board comprises: a rectangular circuit board and a plurality of microphone units arranged on the rectangular circuit board, the plurality of microphone units are arranged in rows and columns to form a rectangular microphone array; wherein the number of columns of the rectangular microphone array is greater than the number of rows of the rectangular microphone array, and the ratio between the number of columns of the rectangular microphone array and the number of rows of the rectangular microphone array is within a preset threshold range. By setting the number of columns to be greater than the number of rows and the ratio between the two to be within the preset threshold range, the microphone array board can meet the higher positioning accuracy requirement in the row direction through the microphone units in the row direction, and can meet the lower positioning accuracy requirement in the column direction through the microphone units in the column direction. That is, the sound source accuracy positioning requirement in the conference room scene is met with fewer microphone units, the cost and size of the microphone array board are reduced, and the cost and size of the microphone device can be correspondingly reduced.

Description

Technical Field

[0001] This application relates to the field of conference equipment technology, and more particularly to a microphone array and microphone device. Background Technology

[0002] Microphone devices used in conference rooms in related technologies typically employ multiple microphone units arranged linearly or in a ring. However, linearly arranged microphone units suffer from ambiguity in sound source localization due to sound source mirroring issues. Ring-arranged microphone units, to achieve omnidirectional high-precision sound source localization, require a huge number of microphones (often reaching hundreds), and are also quite bulky.

[0003] However, in the process of developing this application, the inventors discovered that omnidirectional high-precision sound source localization is not actually required in a conference room setting. For example, in a scenario where microphones are arranged on a table, the participants distributed around the microphones in the horizontal direction are usually quite dense, requiring high sound source localization accuracy in the horizontal direction; while in the vertical direction, there are usually only standing and sitting participants, requiring less sound source localization accuracy. Therefore, although using a ring-shaped distribution of microphones achieves omnidirectional high-precision localization, the arrangement of more microphone units is wasteful for directions that do not actually require high-precision localization, and it also increases the cost of the microphone equipment. Utility Model Content

[0004] To address at least one technical problem existing in the prior art, this application proposes a microphone array board, comprising: a rectangular circuit board and a plurality of microphone units disposed on the rectangular circuit board, the plurality of microphone units being arranged in rows and columns to form a rectangular microphone array; wherein, the number of columns of the rectangular microphone array is greater than the number of rows of the rectangular microphone array, and the ratio between the number of columns of the rectangular microphone array and the number of rows of the rectangular microphone array is within a preset threshold range.

[0005] In some embodiments, along the length of the rectangular microphone array, the column spacing is greater in the middle than at both ends; the row spacing of the rectangular microphone array is equal.

[0006] In some embodiments, the distance between any adjacent microphone units in the rectangular microphone array is less than a preset spacing threshold, which is determined based on the wavelength corresponding to the highest frequency in human speech.

[0007] In some embodiments, the number of rows of the rectangular microphone array ranges from [3, 5], and the number of columns of the rectangular microphone array ranges from [15, 17].

[0008] In some embodiments, the preset threshold range is [3, 5].

[0009] In some embodiments, when the number of rows of the rectangular microphone array is 4, the number of columns of the rectangular microphone array is 16.

[0010] In some embodiments, the length of the rectangular microphone array is in the range of [28cm, 32cm], and the width of the rectangular microphone array is in the range of [2cm, 3cm].

[0011] In some embodiments, this application also provides a microphone device, which includes: a bottom shell, a top cover, and a microphone array plate, wherein the microphone array plate is the microphone array plate described in any embodiment of this application; a microphone array plate mounting seat is provided inside the bottom shell, the microphone array plate mounting seat is used to install the microphone array plate, and the top cover is provided with mesh holes corresponding to the position of the rectangular microphone array.

[0012] In some embodiments, the top cover includes a mesh cover and a first end cap and a second end cap fixedly connected to both ends of the mesh cover; the mesh cover includes a top wall of the mesh cover and two symmetrically arranged side walls of the mesh cover, the lower edges of the two side walls of the mesh cover being elastically embedded between the two side walls of the bottom shell; the first end cap and the second end cap are fixedly connected to the bottom shell.

[0013] The microphone device in this embodiment features a three-section structure for the top cover: a central mesh cover and two end caps. The mesh cover is flexibly embedded in the bottom shell, while the first and second end caps provide a fixed connection to the bottom shell. Therefore, when the top cover needs to be removed, simply detach the fixed connections between the first and second end caps and the shell, then squeeze the two side walls of the mesh cover to remove the entire top cover. This ensures both ease of installation and removal while maintaining structural strength.

[0014] In some embodiments, a first snap-fit ​​structure is provided on the lower edge of the sidewall of the mesh cover, and a second snap-fit ​​structure is provided on the corresponding sidewall of the bottom shell. The first snap-fit ​​structure and the second snap-fit ​​structure cooperate with each other to achieve elastic snap-fit ​​installation between the mesh cover and the bottom shell.

[0015] In some embodiments, the first snap-fit ​​structure includes a snap-fit ​​groove extending along the length of the sidewall of the mesh cover, and the second snap-fit ​​structure includes a snap-fit ​​rib extending along the length of the sidewall of the bottom shell, the snap-fit ​​rib snapping into the snap-fit ​​groove.

[0016] In some embodiments, a first upper mounting seat is provided on the inner side of the first end cover, and a first lower mounting seat is provided on the bottom shell at a position opposite to the first upper mounting seat. The first upper mounting seat and the first lower mounting seat are fixedly installed on the first end cover by screws. The second end cover is provided with a second upper mounting seat on its inner side, and a second lower mounting seat is provided on the bottom shell at a position opposite to the second upper mounting seat. The second upper mounting seat and the second lower mounting seat are fixedly installed on the second end cover by screws.

[0017] In some embodiments, the microphone device further includes a mesh support frame for supporting the mesh, the mesh support frame including two support arms and a support beam, the two support arms being symmetrically arranged on both sides of the circuit board along its length, and the two ends of the support beam being fixedly connected to the top ends of the two support arms respectively.

[0018] The microphone array board of this application adopts a rectangular circuit board, and multiple microphone units are arranged in rows and columns to form a rectangular microphone array on the rectangular circuit board. The number of columns in the rectangular microphone array is greater than the number of rows, and the ratio between the number of columns and rows is within a preset threshold range. By setting the number of columns to be greater than the number of rows, and ensuring the ratio is within the preset threshold range, the microphone array board can meet the high positioning accuracy requirements in the row direction with more microphone units, and the low positioning accuracy requirements in the column direction with fewer microphone units. In other words, it meets the sound source accuracy positioning requirements in conference room scenarios with fewer microphone units, reducing the cost and size of the microphone array board, and correspondingly reducing the cost and size of the microphone equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a microphone array provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a microphone array provided in another embodiment of this application; Figure 3 This is a schematic diagram of the structure of a microphone array provided in another embodiment of this application; Figure 4 This is a schematic diagram of the structure of a microphone device provided in an embodiment of this application; Figure 5 This is an exploded view of the structure of a microphone device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the assembly structure between the bottom shell and the top cover provided in an embodiment of this application; Figure 7A schematic diagram of the mounting structure of the first end cap provided in an embodiment of this application; Figure 8 This is a perspective sectional view of a microphone device provided in an embodiment of this application; Figure 9 A cross-sectional view of a microphone device provided in another embodiment of this application; Figure 10 A partial structural schematic diagram of the bottom shell provided in an embodiment of this application; Figure 11 This is a schematic diagram of the bottom shell structure provided in one embodiment of this application; Figure 12 This is a schematic diagram of the structure of the first baffle provided in an embodiment of this application; Figure 13 This is a schematic diagram of the structure of the second baffle provided in one embodiment of this application; Figure 14 This is a schematic diagram of the rear structure of a microphone device provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] like Figure 1 The diagram shows a schematic of a microphone array provided in one embodiment of this application. In this embodiment, the microphone array includes a rectangular circuit board 210 and a plurality of microphone units m1 disposed on the rectangular circuit board 210. The plurality of microphone units m1 are arranged in rows and columns to form a rectangular microphone array; wherein, the number of columns of the rectangular microphone array is greater than the number of rows of the rectangular microphone array, and the ratio between the number of columns and the number of rows of the rectangular microphone array is within a preset threshold range. In this embodiment, the plurality of microphone units m1 are electret microphone units.

[0023] The microphone array board of this application adopts a rectangular circuit board, and multiple microphone units are arranged in rows and columns to form a rectangular microphone array on the rectangular circuit board. The number of columns in the rectangular microphone array is greater than the number of rows, and the ratio between the number of columns and rows is within a preset threshold range. By setting the number of columns to be greater than the number of rows, and ensuring the ratio is within the preset threshold range, the microphone array board can meet the high positioning accuracy requirements in the row direction with more microphone units, and the low positioning accuracy requirements in the column direction with fewer microphone units. In other words, it meets the sound source accuracy positioning requirements in conference room scenarios with fewer microphone units, reducing the cost and size of the microphone array board, and correspondingly reducing the cost and size of the microphone equipment.

[0024] Continue to refer to Figure 1 In some embodiments, along the length of the rectangular microphone array, the column spacing is greater in the middle than at the ends; the row spacing of the rectangular microphone array is equal. Figure 1 As shown, the column spacing between columns 7 to 10 is greater than the column spacing between other adjacent columns. This matrix microphone array distribution, sparse in the middle and dense at the ends, allows for accurate localization of nearby sound sources with fewer microphone units in the middle, and accurate localization of distant sound sources with more dense microphone units at the ends.

[0025] Continue to refer to Figure 1 In some embodiments, the distance between any adjacent microphone units m1 in the rectangular microphone array is less than a preset spacing threshold, which is determined based on the wavelength corresponding to the highest frequency in human speech.

[0026] For example, the preset spacing threshold is half the wavelength corresponding to the highest frequency in human speech. In this embodiment, by setting the distance between any two adjacent microphone units m1 to less than half the wavelength corresponding to the highest frequency in human speech, the problems of spatial aliasing and grating lobe effects in the high-frequency band are avoided.

[0027] In some embodiments, the number of rows in the rectangular microphone array ranges from [3, 5], and the number of columns in the rectangular microphone array ranges from [15, 17]. The ratio between the number of columns and the number of rows in the rectangular microphone array is within a preset threshold range, which is [3, 5].

[0028] Continue to refer to Figure 1The rectangular microphone array has 4 rows and 16 columns. The length L2 of the rectangular microphone array ranges from [28cm, 32cm], and the width W2 ranges from [2cm, 3cm]. The length L1 of the rectangular circuit board is (461±0.01)mm, and the width W1 is (80±0.01)mm.

[0029] It should be noted that the specific values ​​of the length and width of the rectangular microphone array and the length and width of the rectangular circuit board mentioned above are merely examples, and this application does not impose any limitations on them.

[0030] like Figure 2 The diagram shown is a structural schematic of a microphone array provided in another embodiment of this application. This embodiment is similar to... Figure 1 The only difference in the illustrated embodiment is that the microphone unit m2 in this embodiment uses a silicon microphone.

[0031] like Figure 3 The diagram shown is a structural schematic of a microphone array provided in another embodiment of this application. This embodiment is similar to... Figure 1 The only difference in the illustrated embodiment is that it employs two different types of microphone units, m1 and m2. Microphone unit m1 is an electret microphone unit, while microphone unit m2 is a silicon microphone. In this embodiment, the two types of microphone units are arranged in alternating columns. It should be noted that... Figure 3 The spacing arrangement shown is merely an example, and this application does not limit it.

[0032] The rectangular microphone array on the microphone array board in this application has a large length in the horizontal direction, which can provide high horizontal azimuth resolution for the microphone device; and a small width in the vertical direction, which is sufficient to solve the mirroring problem of linear microphones and distinguish sound sources at different heights.

[0033] In rectangular microphone array design, the length and width dimensions of the array directly determine its spatial resolution at different frequencies. The primary effective frequency range of human speech is approximately 100Hz–8kHz; the speed of sound in air is approximately 343m / s (at 20℃), corresponding to a sound wave wavelength range of: 100 Hz → λ ≈ 3.43 m 1 kHz → λ ≈ 0.343 m 8 kHz → λ ≈ 0.043 m The relationship between the length and width dimensions of the rectangular microphone array and the resolution is as follows: The angular resolution of a rectangular microphone array is directly proportional to the maximum length D of the rectangular microphone and inversely proportional to the wavelength λ. Δθ≈D / λ Where Δθ is the angular resolution (in radians), which describes the ability of a rectangular microphone array to distinguish the orientation of two adjacent sound sources. It reflects the accuracy of the rectangular microphone array's "directional resolution" in spatial positioning. If the angle between two sound sources is smaller than the angular resolution of the rectangular microphone array, the array will have difficulty distinguishing them. The smaller the angular resolution, the "sharper" the array, and the more accurate the direction perception. λ is the signal wavelength. D is the maximum length of the rectangular microphone array, referring to the distance between the two farthest microphone units in the array.

[0034] When the length of a rectangular microphone array is large, better angular resolution can be obtained in the mid-to-low frequency range (longer wavelength); when the length of a rectangular microphone array is too small, it will be difficult to distinguish the sound source in the low frequency range.

[0035] Continue to refer to Figure 1 The length and width of the rectangular microphone array in this application are designed as follows: Horizontal direction: The 16 units are evenly distributed to form a relatively large length (e.g., about 30 cm), which can achieve an azimuth resolution of less than ±1° for mid-frequency speech signals of about 1 kHz (λ≈0.34 m).

[0036] Vertical direction: With only 4 units, forming a small width (e.g., about 2–3 cm), it can still provide sufficient pitch resolution in the high-frequency range (a few kiloHz) while avoiding excessive height of the device.

[0037] The combination of a large horizontal length and a small vertical width in this application perfectly covers the main frequency range of speech, ensuring both high-precision positioning and maintaining a compact product shape.

[0038] In some embodiments, the spacing between adjacent microphone units is designed to be less than half the wavelength λ of the highest frequency signal, thereby avoiding the problems of spatial aliasing and grating lobe effect in the high-frequency band when it is greater than λ / 2.

[0039] In some embodiments, some microphone units are arranged with non-uniform / specific spacing (e.g., the spacing between the middle columns of the matrix microphone array is greater than the spacing between the end columns and / or the spacing between adjacent microphone units is designed to be less than half of the wavelength λ of the highest frequency signal), avoiding grating lobes in the high-frequency band (>4 kHz, λ<8.5 cm), thereby extending the effective operating bandwidth of the array.

[0040] Figure 4 This is a schematic diagram of a microphone device according to an embodiment of this application. In this embodiment, the microphone device includes: a bottom shell 100, a top cover 300, and a microphone array panel 210. Figure 4(Not shown in the image) The microphone array 210 is the microphone array 210 described in any of the preceding embodiments; a microphone array 210 is provided inside the bottom shell 100, and the microphone array 210 is installed in the microphone array 210; the top cover 300 is provided with a mesh corresponding to the position of the rectangular microphone array.

[0041] In some embodiments, the top cover 300 includes a mesh cover 210 and a first end cap 320 and a second end cap 330 fixedly connected to both ends of the mesh cover; the mesh cover 210 includes a top wall of the mesh cover and two symmetrically arranged side walls of the mesh cover, the lower edges of the two side walls of the mesh cover being elastically embedded between the two side walls of the bottom shell 100; the first end cap 320 and the second end cap 330 are fixedly connected to the bottom shell 100.

[0042] The microphone device of this application is elongated and designed to be placed under a monitor, on a desktop, or hung on a conference room wall, etc., and this application does not limit it in this respect.

[0043] In developing the microphone device of this application, the inventors discovered that the top cover of microphone devices in related technologies is entirely designed as a perforated mesh. This design results in a lack of space on the mesh for fixed installation (e.g., for creating screw holes). Therefore, to ensure the stability of the connection between the mesh and the housing, related technologies use adhesive to glue the entire mesh to the housing. However, this method is inconvenient when disassembling the mesh, requiring external tools. Furthermore, due to the low structural strength of the mesh itself, disassembly with tools may cause deformation or damage to the mesh. Therefore, the inventors proposed the microphone device described in the following embodiments of this application.

[0044] like Figure 5 The diagram shown is an exploded view of an embodiment of the microphone device of this application. In this embodiment, the microphone device includes a bottom shell 100, a circuit board 200, and a top cover 300. The bottom shell 100 is provided with a circuit board mounting base for mounting the circuit board 200. The top cover 300 includes a mesh cover 310 and a first end cap 320 and a second end cap 330 fixedly connected to both ends of the mesh cover 310. The mesh cover 310 includes a top wall 311 and two symmetrically arranged side walls (e.g., a first side wall 312 and a second side wall 313). The lower edges of the two side walls are elastically embedded between the two bottom shell side walls (e.g., a first bottom shell side wall 110 and a second bottom shell side wall 120) of the bottom shell 100.

[0045] For example, a first snap-fit ​​structure is provided on the lower edge of the first mesh cover sidewall 312, and a second snap-fit ​​structure is provided on the corresponding first bottom shell sidewall 110 of the bottom shell 100. The first snap-fit ​​structure and the second snap-fit ​​structure cooperate with each other to realize the elastic snap-fit ​​installation between the mesh cover 310 and the bottom shell 100.

[0046] In this embodiment, when the top cover 300 needs to be installed, it is only necessary to cover the bottom shell 100 with the top cover 300 and press it down to achieve the elastic snap-fit ​​installation of the two; when the top cover needs to be removed, the two side walls of the mesh cover 310 can be squeezed inward to open the snap-fit ​​structure on the side wall of the mesh cover 310 and the snap-fit ​​structure on the side wall of the bottom shell, so as to realize the removal and installation of the top cover.

[0047] like Figure 6 The diagram shows an assembly structure between the bottom shell and the top cover according to an embodiment of this application. In this embodiment, the first snap-fit ​​structure includes a snap-fit ​​groove 3121 extending along the length direction of the first mesh cover sidewall 312, and the second snap-fit ​​structure includes a snap-fit ​​rib 111 extending along the length direction of the first bottom shell sidewall 110, the snap-fit ​​rib 111 snapping into the snap-fit ​​groove 3121. The first snap-fit ​​structure and the second snap-fit ​​structure located on the second mesh cover sidewall 313 and the second bottom shell sidewall 120 adopt the same assembly method and structure, which will not be described again here. During the process of installing the top cover 300 into the bottom shell 100, the snap-fit ​​ribs on the first bottom shell side wall 110 and the second bottom shell side wall 120 firstly press the lower ends of the first mesh cover side wall 312 and the second mesh cover side wall 313 inward, causing them to deform. As the snap-fit ​​rib 111 begins to enter the snap-fit ​​groove 3121, the side wall of the first mesh cover side wall 312 gradually recovers its deformation. Finally, the snap-fit ​​rib 111 completely enters the snap-fit ​​groove 3121 to achieve a tight installation between the top cover and the bottom shell.

[0048] like Figure 7 The diagram shows a schematic of the installation structure of the first end cap according to an embodiment of this application. This schematic is a three-dimensional sectional view. In this embodiment, two first upper mounting seats 3211 are provided on the inner side of the first end cap 320 (the number of first upper mounting seats can be one or more, which is not limited in this application). Two first lower mounting seats 151 are provided on the bottom wall 150 of the bottom shell 100 at positions opposite to the first upper mounting seats 3211 (the number of first lower mounting seats can be one or more, which is not limited in this application). The first upper mounting seats 3211 and the first lower mounting seats 151 are fixedly installed on the first end cap 320 by screws. The connection method and mechanism between the second end cap 330 and the bottom shell refer to the connection method and structure between the first end cap 320 and the bottom shell described above, and will not be repeated here.

[0049] Continue to refer to Figure 5 and Figure 7One end 322 of the first end cap is embedded in the first end of the mesh cover 310. The first end cap 320 includes a first end cap top wall 321 and three first end cap side walls 323, wherein the three first end cap side walls 323 are embedded between the two bottom shell side walls (first bottom shell side wall 110 and second bottom shell side wall 120) and the first bottom shell end wall 130 of the bottom shell 100. A first upper mounting seat 3211 is disposed on the lower surface of the top wall of the first end cap 320 (e.g., the side of the top wall facing the bottom shell).

[0050] One end 332 of the second end cap is embedded in the second end of the mesh cover 310. The second end cap 330 includes a second end cap top wall 331 and three second end cap side walls 333, wherein the three side walls 333 are embedded between the two bottom shell side walls (the first bottom shell side wall 110 and the second bottom shell side wall 120) and the second bottom shell end wall 140 of the bottom shell 100. A second upper mounting seat is disposed on the lower surface of the second end cap top wall 331 of the second end cap 330 (e.g., the side of the top wall facing the bottom shell).

[0051] like Figure 7 As shown, the first lower mounting base 151 has an open design on its bottom wall for inserting screws to connect the first lower mounting base 151 and the first upper mounting base 3211 together. In some embodiments, the lengths of the first lower mounting base 151 and the first upper mounting base 3211 are set such that when the first end cover 320 is installed in place, the first upper mounting base 3211 and the first lower mounting base 151 just abut against each other, thereby achieving both fixed installation of the first end cover 320 and support for the first end cover 320, preventing deformation during fixed installation.

[0052] Furthermore, a silicone foot pad 152 is provided on the lower surface of the bottom wall 150, and the silicone foot pad 152 is installed at the opening in the bottom wall of the first lower mounting base 151. In addition, a protrusion may be provided on the silicone foot pad 152 for filling the opening in the bottom wall of the first lower mounting base 151.

[0053] Continue to refer to Figure 5 Two limiting blocks 112 are provided on the first bottom shell sidewall 110 of the bottom shell 100, and corresponding limiting recesses 3122 are provided at corresponding positions on the first mesh cover sidewall 312. Furthermore, fixing holes are also provided on the limiting blocks 112, and screws (e.g., ...) can be used for fixing holes at corresponding positions on the first mesh cover sidewall 312. Figure 5 The limiting block and the first mesh cover sidewall 312 are fixedly connected by an M1.4 screw.

[0054] In this embodiment, the mutually cooperating limiting block 112 and limiting notch 3122 achieve the foolproof limiting during the installation of the upper cover 300.

[0055] Continue to refer to Figure 5 The first end cap 320 has an embedding edge and a fixing edge on one end 322. The embedding edge is located on the edge of the top wall 321 near the mesh cover 310, and the fixing edge is located on one end of each of the two opposite side walls of the first end cap 320 near the mesh cover 310. In the installed state, both the embedding edge and the fixing edge are embedded inside the mesh cover 310. The embedding edge can be glued to the mesh cover, and the fixing edge can be fixed to the side wall of the mesh cover using screws (two M1.4 screws). The connection method of the second end cap 330 is described above and will not be repeated here. It should be noted that the above are merely examples, and this application does not limit the scope of the application.

[0056] Continue to refer to Figure 5 The microphone device of this application also includes a mesh support frame 340 for supporting the mesh 310. The mesh support frame 340 includes a support beam 341 and two support arms (e.g., a first support arm 342 and a second support arm 343). The first support arm 342 and the second support arm 343 are symmetrically arranged on both sides of the circuit board along its length. The two ends of the support beam 341 are fixedly connected to the top ends of the first support arm 342 and the second support arm 343, respectively. The bottom ends of the first support arm 342 and the second support arm 343 are fixedly connected to the bottom wall 150 of the bottom shell 100 (e.g., ...). Figure 5 As shown, it is fixed to the bottom shell using M3 screws.

[0057] The number of mesh cover support frames 340 is at least one. For example... Figure 5 In the illustrated embodiment, four mesh cover support frames 340 are evenly distributed at the lower end of the mesh cover 310, providing support for the mesh cover 310 and ensuring its structural stability. Furthermore, a buffer structure is provided between the support beam 341 and the mesh cover 310. This buffer structure can be the support mesh fabric, which is not limited in this application. In this embodiment, by providing a buffer structure between the support beam 341 and the mesh cover 310, the mesh cover can be protected, and noise generated by collisions between the mesh cover and the support beam can be effectively avoided.

[0058] Continue to refer to Figure 5In the microphone device of this application, the circuit board includes a microphone array board 210 and a main board 220. The circuit board mounting base includes microphone array board mounting bases (m1, m2, m3, m4) for mounting the microphone array board 210 and main board mounting bases (z1, z2, z3, z4, z5, z6, z7, z8, where z5, z6, z7, z8 are four main board mounting bases symmetrically distributed with z1, z2, z3, z4, not shown in the figure) for mounting the main board 220. The height of the microphone array board mounting base is greater than the height of the main board mounting base. In this embodiment, the height of the microphone array board mounting base is set to be greater than the height of the main board mounting base, so that after the two circuit boards are installed, the microphone array board 210 is located above the main board 220, which facilitates the microphone array board to receive and / or produce sound. Figure 5 As shown, the microphone array board 210 is fixedly connected to the microphone array board mounting base with M3 screws; the motherboard 220 is fixedly connected to the motherboard mounting base with M3 screws.

[0059] In some embodiments, a clearance groove is provided on the circuit board at a position corresponding to the support arm of the mesh support bracket 340. For example... Figure 5 As shown, both the microphone array board 210 and the main board 220 have grooves for the support arms of the avoidance mesh support bracket 340. These grooves allow for tight mounting of internal components, improving the utilization of internal space and effectively controlling the size of the microphone device.

[0060] Continue to refer to Figure 5 The microphone device of this application also includes a dustproof mesh 350, which is disposed on the microphone array plate 210. In this embodiment, the dustproof mesh 350 and the mesh cover 310 are installed independently, which facilitates the removal and replacement of the mesh cover 310 when needed.

[0061] Continue to refer to Figure 5 The microphone device of this application also includes an indicator light assembly 400, which includes an indicator light 410 and a light guide 420. The indicator light 410 is installed on the lower surface of the microphone array 210, and the light guide 420 is installed in a pre-drilled through hole on the microphone array 210. The light guide 420 guides the light emitted by the indicator light 410 to the mesh cover 310.

[0062] like Figure 8The image shown is a perspective cross-sectional view of a microphone device provided in an embodiment of this application. In this embodiment, a first mesh cover light-shielding foam 431 (e.g., attached to the microphone array board with double-sided tape 434) is provided around the indicator light in the gap between the microphone array board 210 and the mesh cover 310. A second mesh cover light-shielding foam 432 is provided around the position corresponding to the indicator light in the gap between the microphone array board 210 and the main board 220. A light-shielding sheet 433 is also provided below the second mesh cover light-shielding foam to prevent light leakage from shining onto the main board below.

[0063] like Figure 9 The image shown is a cross-sectional view of a microphone device according to another embodiment of this application. In this embodiment, a light guide path is shown, whereby after the light emitted by the indicator light 410 is refracted at the lower end of the light guide 420, it shines vertically upward from the surface of the mesh cover.

[0064] like Figure 10 The diagram shown is a partial structural schematic of a bottom shell according to an embodiment of this application. In this embodiment, the bottom wall 150 of the bottom shell 100 has a protruding structure 153 in the middle. From an external viewpoint, this part is a recessed structure (i.e., the bottom wall 150 is concave from the outside of the shell to the inside). Continuing to refer to... Figure 10 The protruding structure 153 (i.e., the recessed structure) has open ends, and the bottom shell 100 is integrally formed (for example, the bottom shell can be integrally processed by casting or stamping). The openings at both ends of the protruding structure 153 (i.e., the recessed structure) include a first opening and a second opening, which are distributed along the length direction of the bottom shell.

[0065] In this embodiment, the outer surface of the bottom wall 150 of the bottom shell 100 is set as a recessed structure, which facilitates the setting of line interfaces (including but not limited to network interfaces, Type-C connectors, power interfaces, and at least one of other connectors) at the recessed structure. This makes full use of the structural space of the bottom shell 100, improves space utilization, and reduces the size of the microphone device.

[0066] Furthermore, the microphone device of this application also includes a first baffle 154 and a second baffle 155, which are respectively disposed at the first opening and the second opening to achieve the encapsulation of the first opening and the second opening.

[0067] In this embodiment, the bottom shell 100 adopts an integral molding design, and the first baffle and the second baffle are set separately. The first baffle and the second baffle are not integrally molded and manufactured with the bottom shell 100, which simplifies the production process of the bottom shell 100.

[0068] like Figure 11The diagram shown is a schematic representation of the bottom shell structure provided in an embodiment of this application. In this embodiment, the first baffle and the second baffle are in the installed state.

[0069] like Figure 12 The diagram shown is a schematic diagram of the structure of a first baffle provided in an embodiment of this application. In this embodiment, the first baffle 154 includes a top plate 1541 and two side plates 1542. The side plates 1542 are supported and connected to both ends of the top plate 1541, and the first baffle is installed and fixed at the first opening 1531 through the screw holes 1543 on the top plate 1541.

[0070] like Figure 13 The diagram shows a schematic representation of the structure of a second baffle provided in an embodiment of this application. In this embodiment, the second baffle 155 includes a top wall 1551 and a side wall 1552. Two mounting holes are provided on the top wall 1551, and two mounting holes are provided at the bottom end of the side wall 1552. The second baffle is installed and fixed at the second opening 1532 through the four mounting holes on the second baffle. A line interface 1553 is provided on the side wall 1552, which includes, but is not limited to, at least one of a network interface, a Type-C connector, a power connector, and other connection ports.

[0071] like Figure 14 The diagram shows the rear structure of a microphone device according to an embodiment of this application. In this embodiment, the back of the microphone device is provided with silicone feet 152 for support when the microphone device is placed on a desktop. The back of the microphone device also has wall-mounting holes 156 for wall mounting. The back of the microphone device also has hanging ring holes 157 for ceiling mounting. Furthermore, the microphone device of this embodiment can also be embedded in a desktop.

[0072] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0074] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0076] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A wheat distribution board, characterized in that, include: A rectangular circuit board and multiple microphone units disposed on the rectangular circuit board, the multiple microphone units being arranged in rows and columns to form a rectangular microphone array; wherein, the number of columns of the rectangular microphone array is greater than the number of rows of the rectangular microphone array, and the ratio between the number of columns and the number of rows of the rectangular microphone array is within a preset threshold range.

2. The microphone array board according to claim 1, characterized in that, Along the length of the rectangular microphone array, the column spacing is greater in the middle than at both ends; the row spacing of the rectangular microphone array is equal.

3. The microphone array board according to claim 2, characterized in that, The distance between any adjacent microphone units in the rectangular microphone array is less than a preset spacing threshold, which is determined based on the wavelength corresponding to the highest frequency in human speech.

4. The microphone array board according to claim 2, characterized in that, The number of rows in the rectangular microphone array ranges from [3, 5], and the number of columns in the rectangular microphone array ranges from [15, 17].

5. The microphone array board according to claim 4, characterized in that, The preset threshold range is [3, 5].

6. The microphone array board according to claim 5, characterized in that, When the number of rows in the rectangular microphone array is 4, the number of columns in the rectangular microphone array is 16.

7. The microphone array board according to claim 6, characterized in that, The length of the rectangular microphone array is in the range of [28cm, 32cm], and the width of the rectangular microphone array is in the range of [2cm, 3cm].

8. A microphone device, characterized in that, include: The device comprises a bottom shell, a top cover, and a microphone array panel, wherein the microphone array panel is the same as any one of claims 1-7; a microphone array panel mounting base is provided inside the bottom shell for mounting the microphone array panel, and the top cover has mesh holes corresponding to the position of the rectangular microphone array.

9. The microphone device according to claim 8, characterized in that, The upper cover includes a mesh cover and a first end cover and a second end cover fixedly connected to both ends of the mesh cover; The mesh cover includes a top wall and two symmetrically arranged side walls. The lower edges of the two side walls are elastically embedded between the two side walls of the bottom shell. The first end cap and the second end cap are fixedly connected to the bottom shell.

10. The microphone device according to claim 9, characterized in that, A first snap-fit ​​structure is provided on the lower edge of the side wall of the mesh cover, and a second snap-fit ​​structure is provided on the side wall of the bottom shell. The first snap-fit ​​structure and the second snap-fit ​​structure cooperate with each other to achieve elastic snap-fit ​​installation between the mesh cover and the bottom shell.

11. The microphone device according to claim 10, characterized in that, The first snap-fit ​​structure includes a snap-fit ​​groove extending along the length of the sidewall of the mesh cover, and the second snap-fit ​​structure includes a snap-fit ​​rib extending along the length of the sidewall of the bottom shell, the snap-fit ​​rib snapping into the snap-fit ​​groove.

12. The microphone device according to claim 11, characterized in that, The first end cover is provided with a first upper mounting seat on its inner side, and a first lower mounting seat is provided on the bottom shell at a position opposite to the first upper mounting seat. The first upper mounting seat and the first lower mounting seat are fixedly installed on the first end cover by screws. The second end cover is provided with a second upper mounting seat on its inner side, and a second lower mounting seat is provided on the bottom shell at a position opposite to the second upper mounting seat. The second upper mounting seat and the second lower mounting seat are fixedly installed on the second end cover by screws.

13. The microphone device according to claim 9, characterized in that, It also includes a mesh cover support frame for supporting the mesh cover, the mesh cover support frame including two support arms and a support beam, the two support arms being symmetrically arranged on both sides of the length direction of the circuit board, and the two ends of the support beam being fixedly connected to the top ends of the two support arms respectively.

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