Microphone array for sound source localization test and support thereof

Abstract

The utility model discloses a microphone array for sound source positioning test and a support thereof, the microphone array comprises a base plate and a vertical plate fixed on one side of the top end of the base plate, the outer walls of the two sides of the vertical plate are rotatably provided with support shafts through bearing seats, one end of the surface of each support shaft is fixedly provided with a long plate, the surface of the long plate is slidably provided with an L-shaped slide block, and the L-shaped slide block is provided with a through hole. A transverse rod is fixed to the outer wall of the side, close to the vertical plate, of the L-shaped sliding block, and a plurality of C-shaped sliding blocks are slidably mounted on the surface of the transverse rod. According to the utility model, the microphone units are arranged at the two sides of the sound source, sound signals emitted by the sound source can be better captured, and the symmetrical arrangement enables the time delay and intensity distribution of the sound source reaching each microphone unit to be more uniform, thereby reducing the positioning error caused by the asymmetry of the array structure.

Description

Technical Field

[0001] The utility model relates to the technical field of sound source testing, in particular to a microphone array and a bracket thereof for sound source positioning testing. Background Art

[0002] The microphone array used for sound source localization testing is a technical device for determining the location of the sound source. Its function is to collect sound through an array composed of multiple microphones, and analyze the sound using an acoustic signal processing algorithm to determine the direction and position of the sound source. The structure of the microphone array is usually composed of multiple microphone units, which can be arranged in a linear array, a circular array or other geometric shapes. Each microphone unit has its own position and sensitivity. They can receive sounds from different directions at the same time and transmit these sound signals to the back-end processing unit. In the process of sound source localization, the collected sound signals must first be pre-processed, including filtering, noise reduction and other operations to reduce the interference of environmental noise. Then, the processed sound signal is analyzed using an acoustic signal processing algorithm. Commonly used methods include beamforming, cross-correlation, minimum mean square error, etc.

[0003] As disclosed in the authorization announcement number CN218603595U, a microphone linear array bracket for tire noise testing includes a microphone and a microphone bracket, wherein the microphone bracket includes a bracket main pole and multiple support poles, a laser probe is installed on one side of the bracket main pole to assist in aligning the front end of the microphone, a slide rail is provided on the top of the bracket main pole, and the microphone is slidably connected to the slide rail through a microphone base, and the microphone base slides through the slide rail of the bracket main pole and is laterally positioned with the help of a reference scale line on one side of the slide rail, which greatly improves the efficiency and accuracy of the lateral positioning of the microphone and ensures the test accuracy. However, in this technical solution, sound signals are mainly collected through microphone units on one side of the sound source. However, the sound signals collected on one side of the array structure will have obvious time and intensity differences relative to the other side, which will make it difficult to accurately determine the position of the sound source in some cases, especially when the sound source moves on both sides of the array, due to the asymmetry of the array structure, inaccurate sound source positioning will occur, affecting the reliability and real-time performance of sound source positioning. Utility Model Content

[0004] The purpose of the utility model is to provide a microphone array for sound source localization testing and a bracket thereof, which can form a symmetrical microphone array on both sides of the sound source to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a microphone array for sound source localization testing, comprising a bottom plate and a vertical plate fixed to one side of the top of the bottom plate, support shafts are rotatably installed on the outer walls of both sides of the vertical plate through bearing seats, a long plate is fixed to one end of the surface of the support shaft, and an L-shaped slider is slidably installed on the surface of the long plate, a cross bar is fixed to the outer wall of one side of the L-shaped slider close to the vertical plate, a plurality of C-shaped sliders are slidably installed on the surface of the cross bar, and a double-axial bracket for supporting the microphone is installed on one side outer wall of the C-shaped slider.

[0006] Preferably, arc-shaped guide grooves are provided on both sides of the top of the bottom plate, and a support rod is slidably installed inside the arc-shaped guide groove, and the top of the support rod is fixedly connected to the bottom end of the long board.

[0007] Preferably, the surface of the long plate is provided with a plurality of internal threaded holes arranged vertically and at equal intervals, and a bolt for bolting to one of the internal threaded holes is installed on the outer wall of one side of the L-shaped sliding block.

[0008] Preferably, a stepper motor is installed on one side of the bottom end of the base plate, the output end of the stepper motor is fixedly connected to the bottom end of one of the support shafts through a coupling, and a gear transmission structure is installed between the two support shafts.

[0009] Preferably, vertical rectangular ribs are provided on the outer walls on the opposite sides of the two long plates, and a sliding sleeve that slidably cooperates with the rectangular ribs is installed on the back side of the cross bar.

[0010] The utility model also provides a bracket, which includes the above-mentioned microphone array for sound source positioning test, and the biaxial bracket includes a double hollow right-angle bracket fixed on the outer wall of one side of the C-shaped slider, and two symmetrical threaded shafts installed on the outer wall of one side of the double hollow right-angle bracket, and a vertical clamp and a horizontal clamp are respectively installed at both ends of the surface of the threaded shaft, and a nut sleeve monomer for tightening the vertical clamp and the horizontal clamp is installed at the top of the threaded shaft.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the microphone array and its bracket for sound source localization testing are provided with structures that cooperate with each other, such as long plates and cross bars, and microphone units are arranged on both sides of the sound source, so as to better capture the sound signal emitted by the sound source and obtain a more accurate sound source position estimate during the algorithm processing. The symmetrical arrangement makes the time delay and intensity distribution of the sound source reaching each microphone unit more uniform, reduces the positioning error caused by the asymmetry of the array structure, and improves the accuracy of sound source localization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0014] Figure 3 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the biaxial support of the utility model;

[0016] In the figure: 1, bottom plate; 101, arc guide groove; 2, vertical plate; 3, support shaft; 4, stepping motor; 5, gear transmission structure; 6, long plate; 601, internal threaded hole; 602, support rod; 7, L-shaped slider; 8, bolt; 9, cross bar; 10, C-shaped slider; 11, double axial bracket; 1101, double hollow right-angle bracket; 1102, threaded shaft; 1103, vertical clamp; 1104, nut sleeve monomer; 1105, horizontal clamp. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4 The utility model provides an embodiment: a microphone array for sound source localization test, comprising a bottom plate 1 and a vertical plate 2 fixed to one side of the top of the bottom plate 1, support shafts 3 are rotatably mounted on both sides of the outer wall of the vertical plate 2 through a bearing seat, a long plate 6 is fixed to one end of the surface of the support shaft 3, and an L-shaped slider 7 is slidably mounted on the surface of the long plate 6, a cross bar 9 is fixed to the outer wall of the side of the L-shaped slider 7 close to the vertical plate 2, vertical rectangular ribs are arranged on the outer walls of the two long plates 6 on the opposite sides, and a sliding sleeve that slidably cooperates with the rectangular ribs is installed on the back of the cross bar 9;

[0019] A plurality of C-shaped sliders 10 are slidably mounted on the surface of the crossbar 9, and a biaxial bracket 11 for supporting a microphone is mounted on an outer wall of one side of the C-shaped slider 10;

[0020] A stepper motor 4 is installed on one side of the bottom end of the base plate 1, and the output end of the stepper motor 4 is fixedly connected to the bottom end of one of the support shafts 3 through a coupling, and a gear transmission structure 5 is installed between the two support shafts 3. Two symmetrical microphone arrays synchronously adjust the position between themselves and the sound source through the stepper motor 4, the gear transmission structure 5, the support shaft 3 and other components. The staff can manually adjust the position of the array according to the needs of the sound source positioning test to adapt to different sound source positions and environmental conditions;

[0021] Both sides of the top of the bottom plate 1 are provided with arc-shaped guide grooves 101, and a support rod 602 is slidably installed inside the arc-shaped guide groove 101. The top of the support rod 602 is fixedly connected to the bottom end of the long board 6, and the support rod 602 and the arc-shaped guide groove 101 improve the yaw stability of the long board 6;

[0022] The surface of the long board 6 is provided with a plurality of internal threaded holes 601 arranged at equal intervals vertically. A bolt 8 for bolting to one of the internal threaded holes 601 is installed on the outer wall of one side of the L-shaped slider 7. When the sound source is placed on the central reference plane between the two long boards 6, the staff can manually slide the L-shaped slider 7 so that the L-shaped slider 7 drives the crossbar 9 and the biaxial bracket 11, the microphone unit and other components to rise and fall. Then, the height position of the L-shaped slider 7 is locked by the bolt 8 and the internal threaded hole 601 to adjust the relative height position between the microphone unit and the sound source. When the sound source moves around the array or the environment changes, the symmetrical array arrangement can obtain more stable and consistent sound signal input, which is conducive to the algorithm to accurately and stably track the sound source position.

[0023] Secondly, the utility model also provides a bracket, which includes the above-mentioned microphone array for sound source localization test, and the biaxial bracket 11 includes a double hollow right-angle bracket 1101 fixed on the outer wall of one side of the C-shaped slider 10, and two symmetrical threaded shafts 1102 installed on the outer wall of one side of the double hollow right-angle bracket 1101, and the two ends of the surface of the threaded shaft 1102 are respectively installed with a vertical clamp 1103 and a horizontal clamp 1105, and the top of the threaded shaft 1102 is installed with a nut sleeve monomer 1104 for tightening the vertical clamp 1103 and the horizontal clamp 1105;

[0024] The staff inserts the microphone to be used into the vertical clamp 1103 or the horizontal clamp 1105, at which time the extension lines of the two microphones are in a vertical state, or places the two microphones in the two vertical clamps 1103, at which time the extension lines of the two microphones are in a vertical parallel state. Then the staff rotates the nut sleeve monomer 1104 to continuously tighten the vertical clamp 1103 or the horizontal clamp 1105. At this time, the microphone is fixed, which is convenient for the staff to install quickly.

[0025] When the embodiment of the present application is in use, the staff first places the sound source to be positioned on the central reference plane between the two long boards 6, then installs the microphone unit for picking up the sound signal on the biaxial bracket 11, and slides the C-shaped slider 10 and the biaxial bracket 11 to manually adjust the distance between adjacent microphone units. After the microphone units are initially fixed and debugged, the staff turns on the stepper motor 4 to work, so that the stepper motor 4 drives the two support shafts 3 to rotate synchronously through the gear transmission structure 5, that is, the two long boards 6 swing toward each other synchronously, so that the two rows of microphone units are close to or away from the sound source. By arranging the microphone units on both sides of the sound source, the sound signal emitted by the sound source can be better captured, and a more accurate sound source position estimation can be obtained during the algorithm processing process. The symmetrical arrangement makes the time delay and intensity distribution of the sound source reaching each microphone unit more uniform, reducing the positioning error caused by the asymmetry of the array structure and improving the accuracy of sound source positioning.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A microphone array for sound source localization testing, characterized in that: The invention comprises a bottom plate (1) and a vertical plate (2) fixed to one side of the top of the bottom plate (1); support shafts (3) are rotatably mounted on both side outer walls of the vertical plate (2) via bearing seats; a long plate (6) is fixed to one end of the surface of the support shaft (3); an L-shaped slider (7) is slidably mounted on the surface of the long plate (6); a cross bar (9) is fixed to the outer wall of one side of the L-shaped slider (7) close to the vertical plate (2); a plurality of C-shaped sliders (10) are slidably mounted on the surface of the cross bar (9); and a biaxial bracket (11) for supporting a microphone is mounted on one side outer wall of the C-shaped slider (10).

2. The microphone array for sound source localization testing according to claim 1, characterized in that: Arc-shaped guide grooves (101) are provided on both sides of the top of the bottom plate (1), and a support rod (602) is slidably mounted inside the arc-shaped guide groove (101), and the top of the support rod (602) is fixedly connected to the bottom end of the long plate (6).

3. The microphone array for sound source localization testing according to claim 1, characterized in that: The surface of the long plate (6) is provided with a plurality of internal threaded holes (601) arranged vertically and at equal intervals, and a bolt (8) for bolting to one of the internal threaded holes (601) is installed on the outer wall of one side of the L-shaped sliding block (7).

4. The microphone array for sound source localization testing according to claim 1, characterized in that: A stepper motor (4) is installed on one side of the bottom end of the base plate (1); the output end of the stepper motor (4) is fixedly connected to the bottom end of one of the support shafts (3) via a coupling; and a gear transmission structure (5) is installed between the two support shafts (3).

5. The microphone array for sound source localization testing according to claim 1, characterized in that: Vertical rectangular ribs are arranged on the outer walls of the two long plates (6) on one side opposite to each other, and a sliding sleeve which is slidably matched with the rectangular ribs is installed on the back of the cross bar (9).

6. A bracket, characterized in that: The bracket comprises a microphone array for sound source localization testing according to any one of claims 1 to 5, and the biaxial bracket (11) comprises a double hollow right-angle bracket (1101) fixed on an outer wall of one side of a C-shaped slider (10), and two symmetrical threaded shafts (1102) installed on an outer wall of one side of the double hollow right-angle bracket (1101), a vertical clamp (1103) and a horizontal clamp (1105) are respectively installed at both ends of the surface of the threaded shaft (1102), and a nut sleeve unit (1104) for tightening the vertical clamp (1103) and the horizontal clamp (1105) is installed at the top end of the threaded shaft (1102).

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