Microphone array frame for omni-directional sound source measurement

Abstract

The utility model discloses a microphone array frame for omni-directional sound source measurement. The microphone array frame provided by the utility model is mainly formed by enclosing two annular supports and a hemispherical support. The two annular supports are arranged at the two ends of the hemispherical ring support in the axial direction respectively and connected with the hemispherical ring support, a plurality of measuring points are distributed on the hemispherical ring support, and microphones are installed at the measuring points; the hemispherical ring support is mainly composed of an even number of warp-direction supports, the warp-direction supports are evenly arranged at intervals in the weft direction, the two ends of each warp-direction support are connected with the two annular supports respectively, and every two adjacent radial supports are connected. The microphone array frame not only is light and stable in structure, but also shows good performance in the aspects of sound field acquisition and signal processing, and is suitable for high-precision sound source measurement and analysis in a complex sound field environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of acoustic measurement, concretely relates to a full directivity sound source measurement microphone array frame for sound source positioning and sound field measurement. BACKGROUND

[0002] Sound source positioning and sound field measurement are important research fields of modern acoustic technology, widely applied in industrial detection, architectural acoustics, noise control, speech recognition, 3D audio acquisition and environmental acoustic monitoring, etc. In industrial detection, sound source positioning technology can accurately identify abnormal sound sources in equipment operation, thereby improving the efficiency and accuracy of equipment maintenance; in architectural acoustics, sound field measurement provides a scientific basis for optimizing the acoustic characteristics of the interior of a building; in the field of environmental monitoring, the use of microphone arrays can locate and track noise sources in the environment, achieving real-time control and management of noise.

[0003] The existing microphone array as the core equipment of sound field sampling still faces many technical bottlenecks. First, the existing microphone array has obvious limitations in directivity. Traditional array structures mostly adopt planar or partial spherical structures, with uneven distribution of measurement points and incomplete coverage of directions, making it difficult to meet the demand of sound field measurement in the whole space. This limitation increases the error of sound source positioning, especially in complex environments, making it impossible to achieve high-precision sound field reconstruction.

[0004] Secondly, many existing microphone arrays have not been systematically optimized in the design of measurement point distribution. Uneven spacing between measurement points can lead to artifacts and data bias during sampling, especially in the measurement of low-frequency sound fields, the problem of uneven distribution is more prominent, seriously affecting the accuracy of measurement results. In addition, most of these array racks adopt integral design, lacking flexibility and scalability, with fixed size, shape and number of measurement points, which is difficult to adjust according to different measurement scenarios. For example, in large space measurement, a larger array diameter and more measurement points are needed, while in small space measurement, a smaller structure is needed. This demand is difficult to achieve in fixed design.

[0005] Poor portability is also one of the main problems of current microphone array equipment. The array rack of traditional design is usually bulky and complex in structure, not only increasing the difficulty of transportation and storage, but also requiring a lot of time and manpower in the process of on-site deployment and movement of the equipment. At the same time, many array racks lack independent stable support structure, are easily affected by vibration and external interference, especially in outdoor measurement or industrial site, this instability will directly lead to error of measurement data.

[0006] In terms of material and manufacturing process, many microphone array frames still use traditional metal materials such as steel or aluminum alloy, which, although to some extent, guarantees the strength, but the overall weight is relatively large, which is not conducive to the design of portability. At the same time, the lack of application of innovative materials with light weight, high strength and corrosion resistance makes the existing array frame poor in practicality and durability in long-term use.

[0007] In summary, the existing microphone array has significant shortcomings in full-directional sound field measurement, measurement point distribution optimization, structural flexibility, portability and stability. These problems not only restrict the efficiency and accuracy of acoustic measurement, but also bring many inconveniences to use and operation. Practical new type content

[0008] In view of the shortcomings of the prior art, the utility model provides a microphone array frame for full-directional sound source measurement. The microphone array frame of the utility model has modular design, high-precision full-space sampling capability, light-weight material and high-stability support structure, which can meet the diversified needs of modern sound field measurement and sound source positioning.

[0009] The technical scheme of the utility model is as follows:

[0010] The microphone array frame is mainly formed by two ring-shaped supports and a hemispherical ring support; the two ring-shaped supports are arranged at the two ends of the hemispherical ring support in the axial direction, and are connected with the hemispherical ring support, a plurality of measurement points are distributed on the hemispherical ring support, and a microphone is installed at the measurement point; the hemispherical ring support is mainly composed of an even number of meridional supports, the meridional supports are uniformly arranged along the latitudinal direction, the two ends of each meridional support are connected with the two ring-shaped supports respectively, and the two adjacent radial supports are connected.

[0011] The meridional support is mainly composed of a central arc-shaped rod and a plurality of lateral arc-shaped rods, the central arc-shaped rod and the lateral arc-shaped rods are arranged along the radial direction and the latitudinal direction of the hemispherical ring support respectively, the central arc-shaped rod and the lateral arc-shaped rods are fixedly connected, the two ends of the central arc-shaped rod are connected with the two ring-shaped supports through bolts, forming a meridional arc-shaped part of the hemispherical ring support; on the adjacent two meridional supports, the number of lateral arc-shaped rods on the opposite sides of the central arc-shaped rod is the same, the lateral arc-shaped rods are one-to-one corresponding and aligned along the latitudinal direction, the two corresponding lateral arc-shaped rods are detachably connected through the interlocking structure, forming a latitudinal arc-shaped support part of the hemispherical ring support between the central arc-shaped rods of the two radial supports, at least one measurement point is distributed on each latitudinal arc-shaped support part, and the latitudinal arc-shaped support parts of the hemispherical ring support are staggered, and the positions of the latitudinal arc-shaped support parts are set according to the distribution of the corresponding measurement points.

[0012] The measuring point distribution refers to a national standard, and includes 40 measuring points with equal area on a hemisphere with the projection of an acoustic center of a noise source on a reflecting surface as an origin, forming a multi-level full-directivity acquisition array.

[0013] The number of the meridian supports and the meridian arc-shaped parts is eight.

[0014] In each meridian support, the intersection position of the central arc-shaped rod and the lateral arc-shaped rod is fixedly connected through an integration technology, at least one connecting point is arranged on the central arc-shaped rod, and the connecting point is detachably connected through an interlocking structure, thereby forming a plurality of integrated modules; the integrated module is composed of a section of the central arc-shaped rod or a section of the central arc-shaped rod and at least one lateral arc-shaped rod.

[0015] The microphone array frame further comprises an outer frame support structure, the outer frame support structure adopts a rectangular frame structure formed by a plurality of straight linear struts, and the outer frame support structure is connected with the two annular supports.

[0016] The microphone array frame further comprises an adjusting mechanism connected with the outer frame support structure and used for adjusting the spatial angle of the microphone array frame.

[0017] The microphone array frame adopts an aluminum alloy or a carbon fiber composite material.

[0018] The microphone array frame has the following beneficial effects:

[0019] 1. The microphone array frame is scientifically and geometrically optimized, and is comprehensively improved in terms of array structure, measuring point distribution, portability and adaptability, so that the performance and application value of the prior art are greatly improved.

[0020] 2. The microphone array frame adopts a modular design, so that the entire array can be quickly disassembled and assembled, storage, transportation and on-site deployment are facilitated, and the microphone array frame is particularly suitable for acoustic measurement scenes requiring frequent movement of equipment.

[0021] 3. The microphone array frame adopts an outer frame support structure and an adjusting mechanism, so that a stable mounting base is provided for the array, and the shock resistance and environmental adaptability of the equipment are enhanced, and the equipment can stably work even in outdoor harsh environments or complex terrain conditions.

[0022] 4. The microphone array frame adopts a lightweight high-strength material, which significantly reduces the weight of the equipment, improves the structural strength and durability, reduces the difficulty of carrying and installation, effectively reduces the measurement error caused by environmental vibration or mechanical interference during the measurement process, and ensures the reliability and accuracy of the sound field measurement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Figure 3 is a three-dimensional view of the overall structure of the microphone array stand of the present application;

[0024] Figure 2 Figure 4 is a front view of the microphone array stand (without the outer frame support structure) of the present application;

[0025] Figure 3 Figure 5 is a side view of the microphone array stand (without the outer frame support structure) of the present application;

[0026] Figure 4 Figure 6 is a microphone measurement point distribution diagram of an embodiment of the present application;

[0027] Figure 5 Figure 7 is a three-dimensional view of the outer frame support structure of the microphone array stand of the present application;

[0028] Figure 6 Figure 8 is a three-dimensional view of the integrated module of the microphone array stand of the present application;

[0029] Figure 7 Figure 9 is a three-dimensional view of the fixing block of the microphone array stand of the present application;

[0030] Figure 8 Figure 10 is a fixing connection diagram of the small component of the microphone array stand of the present application. DETAILED DESCRIPTION

[0031] In order for those skilled in the art to better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be described clearly and completely below in conjunction with the drawings in the embodiments of the present specification. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0032] The present application provides a microphone array stand for omnidirectional sound source measurement.

[0033] As shown in Figures 1-8 The microphone array stand is mainly formed by two annular supports and a hemispherical ring support, and microphone measurement points are distributed on the annular supports and the hemispherical ring support; the two annular supports are arranged at the two ends of the hemispherical ring support in the axial direction and are detachably connected with the hemispherical ring support, the hemispherical ring support has a plurality of measurement points, and a microphone is installed at each measurement point. These microphones form an efficient sound field acquisition system, and the microphone array stand of the present application can maximize the receiving capacity of the sound source and ensure that acoustic signals can be effectively captured in different directions. The hemispherical ring support is mainly composed of an even number of meridional supports, the meridional supports are uniformly arranged along the latitude direction of the hemispherical ring support, the two ends of each meridional support are detachably connected with the two annular supports, and the adjacent two radial supports are detachably connected through an interlocking structure.

[0034] The meridional support mainly comprises a central arc-shaped rod and a plurality of lateral arc-shaped rods, the central arc-shaped rod is arranged along the meridian of the hemispherical ring support, the lateral arc-shaped rods are arranged along the latitude of the hemispherical ring support, the central arc-shaped rod and the lateral arc-shaped rods are both in the shape of a circular arc, the central arc-shaped rod and the lateral arc-shaped rods are fixedly connected, the two ends of the central arc-shaped rod are respectively detachably connected with two annular supports, thereby forming a meridional arc-shaped part of the hemispherical ring support; on the adjacent two meridional supports, the number of the lateral arc-shaped rods on the opposite sides of the central arc-shaped rod is the same, the lateral arc-shaped rods on the opposite sides of the two central arc-shaped rods are correspondingly aligned along the latitude, and the two corresponding lateral arc-shaped rods are detachably connected through an interlocking structure, thereby forming a latitudinal arc-shaped support part of the hemispherical ring support between the central arc-shaped rods of the adjacent two radial supports, and at least one measuring point is distributed on each latitudinal arc-shaped support part, the latitudinal arc-shaped support parts of the hemispherical ring support are staggered, and the positions of the latitudinal arc-shaped support parts are set according to the distribution positions of the corresponding measuring points.

[0035] In the hemispherical ring support, the meridional arc-shaped parts are uniformly arranged along the latitude, the circular arc of each meridional arc-shaped part is arranged along the meridian, and the two ends of the circular arc are respectively connected with two annular parts; the radii of the meridional arc-shaped parts are the same, and the centers of the circular arcs of the meridional arc-shaped parts are all located at the spherical center of the hemispherical ring support. A plurality of latitudinal arc-shaped parts are connected between the adjacent two meridional arc-shaped parts, the circular arc of each latitudinal arc-shaped part is arranged along the latitude of the hemispherical ring support, and the center of the circular arc of each latitudinal arc-shaped part coincides with the axis of the hemispherical ring support.

[0036] The staggered arrangement of the latitudinal arc-shaped support parts of the hemispherical ring support specifically means that the latitudinal arc-shaped parts on the two sides of each meridional arc-shaped part are not completely aligned.

[0037] The distribution of the measuring points is set according to the national standard, including 40 measuring points of equal area on the hemispherical surface with the projection of the acoustic center of the measured noise source on the reflecting surface as the origin, and a multi-level omnidirectional acquisition array formed by the microphones on the 40 measuring points. The interval of the measuring points is optimized according to the characteristics of the sound field and the sampling requirements, which can not only ensure the accurate collection of sound waves of different frequencies, but also effectively avoid the sampling distortion problem caused by uneven distribution of measuring points.

[0038] The radius of the hemispherical surface can be 1 meter.

[0039] The center point of the distribution of the measuring points is located at the center of the hemisphere, each meridional support extends to the edge of the array, and the interval of the measuring points is optimized according to the sound field sampling requirements.

[0040] The number of the meridional supports and the meridional arc-shaped parts is eight, the positions and the number of the latitudinal arc-shaped support parts are set according to the positions and the number of the measuring points not distributed on the meridional arc-shaped parts, and the latitudinal arc-shaped support parts cover all the measuring points not distributed on the meridional arc-shaped parts.

[0041] In each meridian support, the intersection position of the central arc-shaped rod and the lateral arc-shaped rod is fixedly connected through an integrated technology, the central arc-shaped rod is provided with at least one connecting point, and the connecting point is detachably connected through an interlocking structure to form a plurality of integrated modules; the integrated module is composed of a section of the central arc-shaped rod or a section of the central arc-shaped rod and at least one lateral arc-shaped rod.

[0042] As shown in Figure 8 The interlocking structure is preferably a concave-convex interlocking structure, and a threaded hole is arranged at the connection position of the interlocking structure, so that the detachable fixing is further realized through cooperation of a bolt and a nut. The bolt connection quick locking design between the array modules enables an operator to quickly complete installation and disassembly of the equipment, and the number and distribution structure of the modules can be flexibly adjusted to adapt to different sound field sampling tasks.

[0043] The microphone array frame can be disassembled and folded, and is convenient for storage and transportation.

[0044] The microphone array frame further comprises an outer frame support structure, the outer frame support structure adopts a rectangular frame structure formed by a plurality of straight type support rods connected through nodes; the outer frame support structure is used for supporting the array frame and providing a stable mounting base, and the outer frame support structure is connected to the two annular supports through a plurality of fixing blocks.

[0045] As shown in Figure 7 The fixing block has a U-shaped clamping groove structure, one side of the U-shaped clamping groove structure extends to an opening side to form an extension, and a threaded hole is formed in the extension. At the connection position of the straight type support rod of the outer frame support structure and the annular support, the straight type support rod and the annular support are sequentially inserted into the clamping groove, a bolt is arranged in the threaded hole, and after the bolt is screwed, the bolt abuts against the straight type support rod to fix the connection position. After the bolt is loosened, the fixing block can be easily removed.

[0046] The microphone array frame further comprises an adjusting mechanism connected with the outer frame support structure and used for adjusting the spatial angle of the microphone array frame. By adjusting the angle of the outer frame and the spatial layout of the array modules, the equipment can adapt to various acoustic experimental requirements, including sound field measurement of free field, reverberation field and semi-free field.

[0047] The microphone array frame is made of aluminum alloy or carbon fiber composite material, so as to reduce the overall weight and improve the structural strength.

[0048] The sound source separation method using the microphone array frame disclosed in the utility model comprises the following steps:

[0049] S1, assemble the microphone array frame in the full anechoic chamber, fix each support through a bolt, arrange sound sources around the microphone array frame, install microphones at each measuring point of the array frame, and respectively calibrate each microphone;

[0050] S2, start the sound source, and collect sound field data by using each microphone on the microphone array frame;

[0051] S3, process the sound field data by using a signal processing algorithm to obtain a separated sound source signal.

[0052] The specific implementation of the utility model is as follows:

[0053] In the embodiment, the microphone distribution is set according to the microphone position (general case) in Table 4.1 in Appendix E of the national standard GB / T 6882-2016, and the microphone distribution diagram of 40 measuring points is as shown in the figure. Figure 4

[0054] In the embodiment, the number of the meridional supports and the meridional arc-shaped parts is eight. The eight meridional arc-shaped parts are the first meridional arc-shaped part to the eighth meridional arc-shaped part arranged in the clockwise direction in sequence.

[0055] The first radial arc-shaped part is distributed with the 1st, 26th, 33rd and 18th measuring points;

[0056] The third radial arc-shaped part is distributed with the 27th, 12th and 19th measuring points;

[0057] The fifth radial arc-shaped part is distributed with the 21st, 6th, 13th and 38th measuring points;

[0058] The seventh radial arc-shaped part is distributed with the 7th, 32nd and 39th measuring points.

[0059] The outer two latitudinal arc-shaped parts between the first meridional arc-shaped part and the second meridional arc-shaped part are respectively distributed with the 8th and 30th measuring points, and the 40th measuring point is distributed on the corresponding precision center ring-shaped support.

[0060] The four latitudinal arc-shaped parts between the second meridional arc-shaped part and the third meridional arc-shaped part are respectively distributed with the 23rd, 5th, 15th and 37th measuring points.

[0061] The four latitudinal arc-shaped parts between the third meridional arc-shaped part and the fourth meridional arc-shaped part are respectively distributed with the 2nd, 24th, 34th and 16th measuring points.

[0062] The outer two latitudinal arc-shaped parts between the fourth meridional arc-shaped part and the fifth meridional arc-shaped part are respectively distributed with the 9th and 31st measuring points.

[0063] The outer two latitudinal arc-shaped parts between the fifth meridional arc-shaped part and the sixth meridional arc-shaped part are respectively distributed with the 28th and 10th measuring points, and the 20th measuring point is distributed on the corresponding precision center ring-shaped support.

[0064] ​The four latitudinal arc-shaped sections between the sixth and seventh longitudinal arc-shaped sections are respectively distributed with the No. 3, 25, 35 and 17 measuring points.

[0065] The four latitudinal arc-shaped sections between the seventh and eighth longitudinal arc-shaped sections are respectively distributed with the No. 22, 4, 14 and 36 measuring points.

[0066] The two latitudinal arc-shaped sections between the eighth and first longitudinal arc-shaped sections are respectively distributed with the No. 29 and 11 measuring points.

[0067] The array frame in the embodiment is assembled by 35 integrated modules, each of which includes an arc-shaped rod and an interlocking connection structure at both ends thereof, facilitating quick assembly and disassembly. All the integrated modules are made of lightweight aluminum alloy material, reducing the overall weight and improving the structural strength and stability.

[0068] In a full anechoic chamber, the microphone array frame of the embodiment is used for sound source separation. The anechoic chamber has good acoustic isolation conditions to reduce the influence of external noise on the experimental results. Multiple sound sources are set up in the laboratory, including a white noise generator, a music playing device and a human voice simulator, to simulate different frequencies and sound field characteristics to test the performance of the array frame.

[0069] The specific process is as follows:

[0070] S1, assemble the microphone array frame in the full anechoic chamber, fix each support with bolts, then install microphones at each measuring point, and calibrate each microphone respectively; specifically:

[0071] S1.1, according to the modular design, quickly assemble the ring-shaped support and the hemispherical ring-shaped support as shown in Figure 2 and Figure 5 Each support and each integrated module is detachably fixed by bolts to ensure stability during the entire experiment. After assembly, use the outer frame support structure as shown in Figure 1 to support, ensuring the stability and reliability of the array frame during the experiment.

[0072] S1.2, before the experiment starts, calibrate each microphone measuring point of the array frame. Use a standard sound source to emit a signal with a known sound pressure level, collect it through each microphone of the array frame, and record the response data to ensure the consistency of the sensitivity and frequency response of each measuring point.

[0073] S2, start the sound source and use each microphone on the microphone array frame to collect sound field data; specifically: through Figure 4The 40 evenly distributed microphone measurement points shown capture sound field information in all directions, recording sound pressure level and spectral information in real time. The center point of the measurement point distribution is located at the array center, and each radial support extends to the array edge, ensuring uniform sampling of the sound field.

[0074] S3, processing the sound field data using a signal processing algorithm to obtain the separated sound source signals. The collected sound field data is analyzed using a signal processing algorithm, and through techniques such as beamforming and blind source separation, the spatial sampling characteristics of the microphone array are utilized to effectively separate different sound source signals.

[0075] The separated sound source signals are evaluated for similarity to the actual sound source signals. By calculating the signal-to-noise ratio (SNR) and root mean square error (RMSE), the performance of the array in sound field separation is evaluated.

[0076] The experimental results show that the 40 microphone measurement points can fully cover the various directions of the sound source, ensuring comprehensive collection of sound field information. In complex sound fields, the array exhibits excellent separation capability, with a correlation of over 95% between the separated signals and the actual sound source signals. The omnidirectional sound source measurement microphone array performs well in sound field separation experiments, successfully achieving effective separation of multiple sound sources, and maintaining high consistency between the separated signals and the actual sound source signals.

[0077] In summary, the sound field separation experiment verifies the feasibility and superiority of the omnidirectional sound source measurement microphone array. The array not only has the advantages of portability and stability in structure, but also exhibits good performance in sound field collection and signal processing, making it suitable for high-precision sound source measurement and analysis in complex sound field environments. The experimental results further support the widespread applicability of the array in practical applications, and have important scientific and engineering value.

[0078] In the description of the embodiments of the present application, the term "a plurality of" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. The terms "include", "contain", "have" and their variants mean "include but are not limited to", unless otherwise specifically emphasized.

[0079] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A microphone array stand for omni-directional sound source measurement, characterized by: The microphone array frame is mainly enclosed by two ring-shaped supports and a hemispherical ring support; the two ring-shaped supports are arranged at two ends of the hemispherical ring support in the axial direction and are connected with the hemispherical ring support; the hemispherical ring support is provided with a plurality of measuring points, and a microphone is arranged at each measuring point; the hemispherical ring support is mainly composed of an even number of meridional supports, and each meridional support is uniformly arranged along the latitudinal direction; the two ends of each meridional support are connected with the two ring-shaped supports, respectively; and two adjacent radial supports are connected.

2. The microphone array stand for omni-directional sound source measurement of claim 1, wherein: The meridional support is mainly composed of a central arc-shaped rod and a plurality of lateral arc-shaped rods; the central arc-shaped rod and the lateral arc-shaped rods are arranged along the radial direction and the latitudinal direction of the hemispherical ring support, respectively; the central arc-shaped rod and the lateral arc-shaped rods are fixedly connected; the two ends of the central arc-shaped rod are connected with the two ring-shaped supports, respectively, to form a meridional arc-shaped part of the hemispherical ring support; on the adjacent two meridional supports, the number of lateral arc-shaped rods on the opposite sides of the central arc-shaped rod is the same; the lateral arc-shaped rods are aligned one by one in the latitudinal direction; the corresponding two lateral arc-shaped rods are detachably connected through an interlocking structure; a latitudinal arc-shaped support part of the hemispherical ring support is formed between the central arc-shaped rods of the two radial supports; at least one measuring point is arranged on each latitudinal arc-shaped support part; and the latitudinal arc-shaped support parts of the hemispherical ring support are arranged alternately, and the positions of the latitudinal arc-shaped support parts are set according to the distribution of the corresponding measuring points.

3. The microphone array stand for omni-directional sound source measurement of claim 2, wherein: The measuring points are distributed according to the national standard, including 40 measuring points with equal area on the hemispherical surface, taking the projection of the acoustic center of the measured noise source on the reflecting surface as the origin, to form a multi-level omnidirectional acquisition array.

4. The microphone array stand for omni-directional sound source measurement of claim 3, wherein: The number of the meridional supports and the meridional arc-shaped parts is eight.

5. The microphone array stand for omni-directional sound source measurement of claim 2, wherein: In each meridional support, the intersection positions of the central arc-shaped rod and the lateral arc-shaped rods are fixedly connected through an integrated technology; at least one connecting point is arranged on the central arc-shaped rod; the connecting points are detachably connected through an interlocking structure; and a plurality of integrated modules are formed. The integrated module is composed of a section of the central arc-shaped rod or a section of the central arc-shaped rod and at least one lateral arc-shaped rod.

6. The microphone array stand for omni-directional sound source measurement of claim 1, wherein: The microphone array frame further comprises an outer frame support structure, which adopts a rectangular frame structure formed by a plurality of straight support rods; and the outer frame support structure is connected with the two ring-shaped supports.

7. The microphone array stand for omni-directional sound source measurement of claim 6, wherein: The microphone array frame further comprises an adjusting mechanism connected with the outer frame support structure and used for adjusting the spatial angle of the microphone array frame.

8. The microphone array stand for omni-directional sound source measurement of claim 1, wherein: The microphone array frame is made of aluminum alloy or carbon fiber composite material.

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