Multi-band sound source localization microphone array installation device

Abstract

The invention relates to the technical field of sound source localization microphone array design, in particular to a multi-band sound source localization microphone array mounting device. The installation device comprises a center array disc, the center array disc comprises a supporting ring and a supporting disc arranged in the center, the supporting ring and the supporting disc are connected through a plurality of spirally-distributed array supporting arms, the array supporting arms are in central symmetry, and the outer side of the supporting ring of the center array disc is detachably connected with one end of an array main supporting arm. The array main supporting arms correspond to the array supporting arms in a one-to-one mode, and the other ends of the array main supporting arms are detachably connected with the array secondary supporting arms. According to the invention, the aperture of the microphone array can be adjusted, the aperture of the microphone array can be changed along with the change of the sound source positioning frequency, the array with various array apertures can be obtained through the disassembly and assembly of the array main support arm and the array secondary support arm, the aperture of the microphone array is increased in a stepped manner, and the stepped expansion of the positioning frequency band is realized.

Description

Technical Field

[0001] The 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 installation device. Background Art

[0002] The sound source localization system based on 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 microphone array is currently widely used in military, industrial and civilian fields, such as: acoustic detection of low-altitude drones, sound source localization of sniper positions, mechanical system fault location detection, horn vehicle location, 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 the various performances 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] The sound source localization algorithm mainly obtains the sound source localization result by analyzing the phase difference between the acoustic signals collected by different array microphones. 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 not enough to locate the position 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 very inconvenient. Using a microphone array with a larger array aperture to locate mid- and high-frequency noise does not affect the positioning results, but the installation and construction of the test equipment will be more troublesome.

[0004] Currently, most microphone arrays on the market are made of 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 a high production cost of the microphone array and difficulty in simply and conveniently realizing 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 installation 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 installation 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 via a plurality of spirally distributed array support arms, wherein the array support arms are centrally symmetrical, wherein 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 arms correspond one-to-one to the array support arms, and the other end of the array main support arm is detachably connected to an array secondary support arm.

[0007] Preferably, the helical 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 support arm and the array secondary support arm.

[0009] Preferably, a mounting groove is provided on the outer side of the support ring, and the mounting groove is arranged on one side of the swing arm axis of the array support arm. 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 with the mounting groove. The screw rod of the first bolt passes through the first through hole and the mounting portion and is connected with 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 opened inwardly at the other end of the main support arm of the array, and a second through hole and a second limiting hole are opened on the two side walls of the U-shaped groove relatively. A mounting arm is provided at one end of the secondary support arm of the array, and the mounting arm fits with the U-shaped groove. The screw rod of the second bolt passes through the second limiting hole, the mounting arm and the second through hole and is connected with 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 array main arm, the array secondary arm and the central array plate have the same thickness.

[0016] Beneficial effects:

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

[0018] The central array plate of the present invention can realize the positioning of medium and high frequency noise sources. The addition of the array main arm and the array secondary arm can make the array aperture larger, meeting the needs of noise positioning in medium and low frequency bands. The present invention is sufficient to meet the positioning frequency requirements of sound sources in different frequency bands. While meeting the diversified noise positioning frequency requirements, it reduces the number of microphone arrays produced and reduces the array production cost.

[0019] The present invention can reduce the size of the microphone array by disassembling the main array arm and the secondary array arm during transportation, thereby achieving lightweight, miniaturized installation and portability of the microphone array. When the array is large and the array arm is long, it is difficult to install the microphone. The present invention designs the main array arm, the secondary array arm and the central array plate separately, and the array arm can be disassembled 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 support arm and the array secondary support arm and then connected to the central array plate, so that the installation of the microphones is more labor-saving and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0024] Figure 2 It 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 It 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 The enlarged structural diagram at A in the middle;

[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 It is a schematic diagram of the three-dimensional structure of the secondary support arm of the array of the present invention;

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

[0032] Fig.10 It 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 groove, 105-first limiting hole, 106-first through hole, 2-array main support arm, 201-mounting part, 202-U-shaped groove, 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 technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the 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 indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example

[0039] like Figure 1-10 As shown, a multi-band sound source localization microphone array installation device includes a central array plate 1, and the central array plate 1 includes a support ring 101 and a support plate 102 arranged in the center, and the support ring 101 and the support plate 102 are concentric. The support ring 101 and the support plate 102 are connected by a plurality of spirally distributed array support arms 103, and the array support arms 103 are centrally symmetrical. The support ring 101, the support plate 102 and the array support arms 103 are integrally formed, and the array aperture is small. When locating a medium and high frequency noise source, 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 plate 1 is detachably connected to one end of the array main support arm 2, and the array aperture is increased after the array main support arm 2 is connected. The array main support arm 2 corresponds to the array support arm 103 one by one, and the number is consistent, 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, and the mounting groove 104 is arranged on one 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 support ring 101 corresponding to the side wall of the mounting groove 104, and 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, and the axial cross-section of the first limiting hole 105 is larger than 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 limiting hole 105 is the same as the thickness of the nut 501 of the first bolt 5, which can keep the upper surface of the microphone array flat and avoid bulges caused by bolt installation, thereby increasing sound reflection and causing interference. A mounting portion 201 is provided at one end of the array main arm 2, and the mounting portion 201 fits with the mounting groove 104. The screw 503 of the first bolt 5 passes through the first through hole 106 and the mounting portion 201 and is connected to the first nut 501.

[0041] The other end of the array main arm 2 is detachably connected to the array secondary arm 3. The other end of the array main arm 2 is a smooth curved surface with a U-shaped groove 202 inwardly opened. The second through hole 204 and the second limiting hole 203 are relatively opened on the two side walls of the U-shaped groove 202. A mounting arm 301 is provided at one end of the array secondary arm 3. The mounting arm 301 fits with the U-shaped groove 202. The screw of the second bolt 6 passes through the second limiting hole 203, the mounting arm 301 and the second through hole 204 and is connected with the second nut 601. The nut of the second bolt 6 can be embedded in the second limiting hole 203. The depth of the second limiting hole 203 is the same as the thickness of the nut of the second bolt 6. The first limiting hole 105 and the second limiting hole 203 are located on the same side of the central array plate 1 to ensure that the upper surface of the microphone array remains flat and reduce interference when the microphone collects signals.

[0042] The support ring 101 and the array main support arm 2 and the array secondary support arm 3 are connected by bolts to ensure the connection security of the array support arm, and avoid the shaking and displacement of the added array main support arm 2 and the array secondary support arm 3, thereby affecting the accuracy of the collected acoustic signal; 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 the 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 center of the array. The array main arm 2, the array secondary arm 3 and the center array plate 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 , and the microphone mounting holes 4 are arranged along the central axis direction of the array support arm 103 .

[0045] Working principle:

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

[0047] When the required positioning frequency band is not within the range covered by the central array plate 1, it is necessary to increase the aperture of the microphone array. 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, so that the array main arm 2 and the central array plate 1 are fixed. 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, and 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 a sound source localization test, the array can stepwise expand the array aperture by adding array arms around a central array, thereby realizing 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 plurality of spirally distributed array support arms, and 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 an array main support arm, and the array main support arm corresponds to the array support arm one by one. The other end of the array main support arm is detachably connected to an array secondary support arm.

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

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 outer side of the support ring, and the mounting groove is arranged on one side of the swing arm axis of the array support arm. 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 with the mounting groove. The screw rod of the first bolt passes through the first through hole and the mounting portion and is connected with 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 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 opened inward at the other end of the main support arm of the array, and a second through hole and a second limiting hole are opened 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 with the U-shaped groove. The screw rod of the second bolt passes through the second limiting hole, the mounting arm and the second through hole and is connected with 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 support arm, the array secondary support arm and the central array plate are the same.

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