A multi-band sound source localization microphone array installation device

Abstract

The present invention relates to the technical field of sound source localization microphone array design, and in particular to a multi-band sound source localization microphone array mounting device. The mounting device includes a central array disk, which includes a support ring and a support disk arranged in the center. The support ring and the support disk are connected by a number of spirally distributed array support arms. The array support arms are centrally symmetrical. The outer side of the support ring of the central array disk is detachably connected to one end of the array main support arm. The array main support arm corresponds to the array support arm one-to-one, and the other end of the array main support arm is detachably connected to the array secondary support arm. The present invention realizes that the aperture of the microphone array is adjustable, and the aperture of the microphone array can be changed as the sound source localization frequency changes. By disassembling and assembling the array main support arm and the array secondary support arm, an array with a variety of array apertures can be obtained, and the aperture of the microphone array is increased stepwise, thereby realizing a stepwise expansion of the positioning frequency band.

Description

Technical Field

[0001] The present invention relates to the technical field of sound source localization microphone array design, in particular to a multi-band sound source localization microphone array installation device. Background Art

[0002] The sound source localization system based on a microphone array collects the acoustic information of the target sound source through the array microphone, and obtains the position of the sound source in the relevant frequency band through a series of post-processing. The sound source localization technology based on the microphone array is currently widely used in military, industrial and civilian fields, such as: acoustic detection of low-altitude drones, sound source positioning of snipers, mechanical system fault location detection, horn vehicle positioning, etc. The microphone array is the key structure of the acoustic signal acquisition end of the sound source localization system. The design of the microphone array is related to various performance of the sound source localization system. The number of array elements will affect the resolution of the positioning result, the array element distribution will affect the resolution of the positioning result and the anti-interference performance of the positioning system, and the array aperture will affect the accuracy of the positioning result.

[0003] Sound source localization algorithms primarily analyze the phase differences between acoustic signals collected by different array microphones to obtain sound source localization results. The array aperture represents the overall size of the microphone array. When the target noise frequency is low, a smaller array aperture is used, and the acoustic signal collected by the array microphone is insufficient to locate the location of the sound source in the target frequency band. A larger array aperture is required, but the installation, storage, and transportation of the microphone array are inconvenient. Using a microphone array with a larger array aperture to locate mid- and high-frequency noise does not affect the localization results, but it makes the installation and setup of the test equipment more complicated.

[0004] Currently, most microphone arrays on the market are made by laser cutting a whole piece of metal. When the frequency of the target sound source changes, the aperture of the microphone array also changes accordingly, and the array needs to be reprocessed, resulting in high production costs of the microphone array and difficulty in simply and conveniently achieving multi-band sound source positioning. Summary of the Invention

[0005] The object of the present invention is to provide a multi-band sound source localization microphone array mounting device, which realizes the adjustable aperture of the microphone array and further realizes the lightweight, miniaturized installation and portability of the microphone array.

[0006] The present invention provides a multi-band sound source localization microphone array mounting device, comprising a central array plate, wherein the central array plate comprises a support ring and a support plate arranged in the center, wherein the support ring and the support plate are connected by a plurality of spirally distributed array support arms, wherein the array support arms are centrally symmetrical, and the outer side of the support ring of the central array plate is detachably connected to one end of an array main support arm, wherein the array main support arm corresponds one-to-one with the array support arm, and the other end of the array main support arm is detachably connected to an array secondary support arm.

[0007] Preferably, the spiral angles of the array main arm, the array secondary arm and the array support arm are the same.

[0008] Preferably, microphone mounting holes are provided on the array support arm, the array main arm and the array secondary arm.

[0009] Preferably, a mounting groove is provided on the outside of the support ring, and the mounting groove is arranged on one side of the array support arm swing arm axis. A first through hole is provided on the support ring corresponding to the side wall of the mounting groove, and a mounting portion is provided at one end of the array main support arm, and the mounting portion fits into the mounting groove, and the screw rod of the first bolt passes through the first through hole and the mounting portion and is connected to the first nut.

[0010] Preferably, a first limiting hole is provided at one end of the first through hole, the first limiting hole is coaxial with the first through hole, the axial cross-section of the first limiting hole is larger than the first through hole, and the nut of the first bolt can be embedded in the first limiting hole.

[0011] Preferably, the depth of the first limiting hole is the same as the thickness of the nut of the first bolt.

[0012] Preferably, a U-shaped groove is provided inwardly at the other end of the main support arm of the array, and a second through hole and a second limiting hole are provided on the two side walls of the U-shaped groove. A mounting arm is provided at one end of the secondary support arm of the array, and the mounting arm fits into the U-shaped groove. The screw of the second bolt passes through the second limiting hole, the mounting arm and the second through hole and is connected to the second nut.

[0013] Preferably, the nut of the second bolt can be embedded in the second limiting hole.

[0014] Preferably, the support ring, the support plate and the array support arm are integrally formed.

[0015] Preferably, the thicknesses of the array main arm, the array secondary arm and the central array disk are the same.

[0016] Beneficial effects:

[0017] The present invention provides a multi-band sound source localization microphone array mounting device. The mounting device realizes adjustable microphone array aperture, and can change the microphone array aperture as the sound source localization frequency changes. By disassembling and assembling the array main arm and the array secondary arm, an array with a variety of array apertures can be obtained. The aperture of the microphone array can be increased in a step-by-step manner, thereby realizing a step-by-step expansion of the positioning frequency band.

[0018] The central array disk of this invention can locate mid- and high-frequency noise sources. Adding primary and secondary array arms can increase the array aperture, meeting the needs of locating mid- and low-frequency noise. This invention can adapt to the frequency requirements of locating sound sources in different frequency bands. While meeting diverse noise localization requirements, it also reduces the number of microphone arrays required and lowers the cost of array production.

[0019] During transportation, the present invention reduces the size of the microphone array by removing the main and secondary array arms, achieving lightweight, compact installation, and portability. Large arrays with long array arms can be difficult to install, but the present invention separates the main and secondary array arms from the central array plate, allowing for detachable array arms for microphone installation, making microphone installation more convenient.

[0020] The central array disk of the present invention is integrally formed and has high strength, and can bear the pressure caused by the installation of multiple array arms, thereby ensuring the stability and robustness of the array.

[0021] According to the present invention, microphones can be installed on the array main arm and the array secondary arm and then connected to the central array plate, so that the installation of the microphone is more labor-saving and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of the multi-band sound source localization microphone array installation device of the present invention;

[0024] Figure 2 This is a front view of the overall structure of the multi-band sound source localization microphone array installation device of the present invention;

[0025] Figure 3 This is a side view of the overall structure of the multi-band sound source localization microphone array installation device of the present invention;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the central array disk of the present invention;

[0027] Figure 5 for Figure 4 A in the middle is an enlarged structural diagram;

[0028] Figure 6 This is a schematic diagram of the three-dimensional structure of the main support arm of the array of the present invention;

[0029] Figure 7 This is a front view of the main support arm of the array of the present invention;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the secondary support arm of the array of the present invention;

[0031] Figure 9 This is a front view of the secondary support arm of the array of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the first bolt and the first nut of the present invention.

[0033] Description of reference numerals:

[0034] 1-center array plate, 101-support ring, 102-support plate, 103-array support arm, 104-mounting slot, 105-first limiting hole, 106-first through hole, 2-array main support arm, 201-mounting part, 202-U-shaped slot, 203-second limiting hole, 204-second through hole, 3-array secondary support arm, 301-mounting arm, 4-mounting hole, 5-first bolt, 501-first nut, 502-nut, 503-screw, 6-second bolt, 601-second nut. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] Example

[0039] like Figure 1-10 As shown, a multi-band sound source localization microphone array mounting device includes a central array plate 1, which comprises a support ring 101 and a centrally located support plate 102. The support ring 101 and support plate 102 are concentric. The support ring 101 and support plate 102 are connected by a number of spirally distributed array support arms 103. The array support arms 103 are centrally symmetrical. The support ring 101, support plate 102, and array support arms 103 are integrally formed. The array aperture is small, so when locating mid- and high-frequency noise sources, the central array plate 1 can be used alone for sound source localization.

[0040] The outer side of the support ring 101 of the central array disk 1 is detachably connected to one end of the array main support arm 2. After the array main support arm 2 is connected, the array aperture increases. The array main support arm 2 corresponds one-to-one with the array support arm 103, and the number is the same, which ensures the unity and integrity of the array. A rectangular mounting groove 104 is provided on the outer curved surface of the support ring 101. The mounting groove 104 is set on the side of the swing arm axis of the array support arm 103 to avoid affecting the microphone mounting hole 4 on the support ring 101. A first through hole 106 is provided on the side wall of the support ring 101 corresponding to the mounting groove 104. A first limiting hole 105 is provided at one end of the first through hole 106. The first limiting hole 105 is coaxial with the first through hole 106. The axial cross-section of the first limiting hole 105 is larger than that of the first through hole 106. The nut 501 of the first bolt 5 can be embedded in the first limiting hole 105. The depth of the first retaining hole 105 is the same as the thickness of the nut 501 of the first bolt 5. This maintains a flat top surface for the microphone array and prevents protrusions caused by bolt installation, which can increase sound reflection and interference. A mounting portion 201 is provided at one end of the array's main support arm 2. Mounting portion 201 fits within mounting slot 104. The screw 503 of the first bolt 5 passes through the first through-hole 106 and mounting portion 201, connecting to the first nut 501.

[0041] The other end of the main array arm 2 is detachably connected to the secondary array arm 3. The other end of the main array arm 2 is a smooth curved surface with an inwardly defined U-shaped groove 202. Secondary through-holes 204 and second stopper holes 203 are defined on opposite sides of the U-shaped groove 202. A mounting arm 301 is provided at one end of the secondary array arm 3, which engages with the U-shaped groove 202. The rod of the second bolt 6 passes through the second stopper hole 203, the mounting arm 301, and the second through-hole 204, connecting with the second nut 601. The nut of the second bolt 6 fits within the second stopper hole 203, the depth of which is the same as the thickness of the nut of the second bolt 6. The first stopper hole 105 and the second stopper hole 203 are located on the same side of the central array plate 1, ensuring a flat top surface for the microphone array and minimizing interference when the microphones collect signals.

[0042] The support ring 101 and the array main support arm 2 and the array secondary support arm 3 are connected with bolts in pairs to ensure the connection security of the array support arms, and avoid the shaking and displacement of the added array main support arm 2 and the array secondary support arm 3, which may affect the accuracy of the collected acoustic signals; the first bolt 5 and the second bolt 6 can be bolts of the same type, avoiding the diversity of the required parts processing dimensions and making installation easier; preferably, hexagonal bolts are used.

[0043] The array main arm 2, the array secondary arm 3 and the array support arm 103 have the same spiral angle and are evenly distributed around the array center. The array main arm 2, the array secondary arm 3 and the central array disk 1 have the same thickness.

[0044] The array support arm 103 , the array main support arm 2 and the array secondary support arm 3 are all provided with microphone mounting holes 4 , which are arranged along the central axis of the array support arm 103 .

[0045] Working principle:

[0046] The center array disk 1 has a relatively small array aperture. When locating mid- and high-frequency noise sources, the center array disk 1 can be used alone for sound source localization.

[0047] When the required positioning frequency band is not within the range covered by the central array plate 1, the microphone array aperture needs to be increased. First, the mounting portion 201 of the array main arm 2 is placed in the mounting groove 104 of the support ring 101, and the first bolt 5 is passed through the first limiting hole 105, the first through hole 106, the mounting portion 201 and the first through hole 106 on the other side of the mounting groove 104. The nut 501 is placed in the first limiting hole 105, and then the first nut 501 is connected to the first bolt 5 to fix the array main arm 2 and the central array plate 1. The remaining array main arms 2 are installed in this way to obtain a microphone array V1 with a larger array aperture.

[0048] When the required positioning frequency band is still not within the range covered by the microphone array V1, it is necessary to further increase the aperture of the microphone array. First, the mounting arm 301 of the array secondary arm 3 is placed in the U-shaped groove 202 of the array main arm 2. Then, the second bolt 6 is passed through the second limiting hole 203, the mounting arm 301 and the second through hole 204. The nut is placed in the second limiting hole 203, and the second bolt 6 is connected to the second nut 601 to fix the array secondary arm 3 and the array main arm 2. The remaining array secondary arms 3 are installed in this way to obtain a microphone array V2 with a larger array aperture.

[0049] The present invention proposes a multi-band sound source localization microphone array installation device. During sound source localization testing, the array can gradually expand the array aperture by adding array arms around the central array, thereby achieving the localization of multi-band noise. At the same time, this assembly and disassembly method facilitates the transportation and storage of the microphone array.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-band sound source localization microphone array installation device, characterized in that: It includes a central array disk, which includes a support ring and a support disk arranged in the center. The support ring and the support disk are connected by a number of spirally distributed array support arms. The array support arms are centrally symmetrical. The outer side of the support ring of the central array disk is detachably connected to one end of the array main support arm. The array main support arm corresponds to the array support arm one-to-one, and the other end of the array main support arm is detachably connected to the array secondary support arm.

2. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: The array main arm, the array secondary arm and the array support arm have the same spiral angle.

3. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: Microphone mounting holes are provided on the array support arm, the array main support arm and the array secondary support arm.

4. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: A mounting groove is provided on the outside of the support ring, and the mounting groove is arranged on one side of the array support arm swing arm axis. A first through hole is provided on the support ring corresponding to the side wall of the mounting groove. A mounting portion is provided at one end of the array main support arm, and the mounting portion fits into the mounting groove. The screw rod of the first bolt passes through the first through hole and the mounting portion and is connected to the first nut.

5. The multi-band sound source localization microphone array installation device according to claim 4, characterized in that: A first limiting hole is provided at one end of the first through hole. The first limiting hole is coaxial with the first through hole. The axial cross-section of the first limiting hole is larger than that of the first through hole. The nut of the first bolt can be embedded in the first limiting hole.

6. The multi-band sound source localization microphone array installation device according to claim 5, characterized in that: The depth of the first limiting hole is the same as the thickness of the nut of the first bolt.

7. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: A U-shaped groove is provided inwardly at the other end of the main support arm of the array, and a second through hole and a second limiting hole are provided on the two side walls of the U-shaped groove. A mounting arm is provided at one end of the secondary support arm of the array, and the mounting arm fits into the U-shaped groove. The screw of the second bolt passes through the second limiting hole, the mounting arm and the second through hole and is connected to the second nut.

8. The multi-band sound source localization microphone array installation device according to claim 7, characterized in that: The nut of the second bolt can be embedded in the second limiting hole.

9. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: The support ring, the support plate and the array support arm are integrally formed.

10. The multi-band sound source localization microphone array installation device according to claim 1, characterized in that: The thickness of the array main arm, the array secondary arm and the central array disk are the same.

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