Microphone array support suitable for collecting music road sound signals

Abstract

The utility model discloses a microphone array support suitable for collecting music road sound signals, which comprises an adsorption type base, a transverse guide rail, a vertical guide rail, a clamping guide rail and microphones. One end of the transverse guide rail is connected with the vertical guide rail through the hollow sliding block, the other end of the transverse guide rail is connected with the adsorption type bases, the two ends of the vertical guide rail are connected with the adsorption type bases, the transverse guide rail is provided with a plurality of solid sliding blocks, the solid sliding blocks are connected with clamping guide rails, and the clamping guide rails are connected with the hollow sliding blocks. The two sides of the clamping guide rail are movably provided with microphone brackets, and the microphone brackets are used for fixing the microphone.

Description

Technical Field

[0001] The utility model relates to the field of public transportation, and in particular to a microphone array bracket suitable for collecting music road surface sound signals. Background Art

[0002] The music highway is a road with grooves or bumps of varying depths. When a car passes by at a certain speed, the car tires will squeeze the air in the grooves to vibrate, thereby achieving the effect of sound. Depending on the depth of the grooves or the different spacing between the grooves, the frequency of the squeezed air vibration can be changed, making the road surface emit sounds of different notes. By regularly setting depressions or bumps on the road surface, when a car passes by at a certain speed, a complete piece of music can be heard.

[0003] In general, at present, most of the domestic music pavements are set up on open roads, and there is no case of setting up music pavements in tunnels. Setting up music pavements in tunnels, especially extra-long tunnels, can effectively warn drivers and passengers and reduce the occurrence of road traffic accidents. There is no ready-made music pavement in the tunnel for testers to test, and the construction period of the music pavement is very short and the cost is high, usually only about ten days. In such a short construction period, we cannot judge whether the designed music pavement meets the design requirements of the music pavement.

[0004] Moreover, it is difficult to use the same testing methods for different music pavement schemes. Compared with the music pavement on open roads, the tunnel is a semi-closed space. Sound waves of different frequencies will be reflected and absorbed on the tunnel walls. If the wall absorption is incomplete, they will accumulate in the tunnel to form a long reverberation. Therefore, different music will also present different effects in the tunnel. Choosing what kind of music can better reduce the reverberation time and reflection in the tunnel is the key to noise reduction in the tunnel.

[0005] Using the acoustic signal of the existing music pavement as an active signal to simulate the role of the music pavement in the tunnel and evaluate the layout of the music pavement in the tunnel can save most of the manpower, material and financial resources. Therefore, what kind of device and how to collect the acoustic signal of the existing music pavement and apply it to the sound field in the tunnel has become an urgent problem to be solved. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a microphone array bracket suitable for collecting sound signals of a music pavement. The microphone array bracket collects the sound signals of the existing music pavement, inverts the sound characteristics of the music pavement, simulates the laying of the music pavement in the tunnel, and realizes the design and evaluation of the music pavement in the tunnel.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A microphone array bracket suitable for collecting music road acoustic signals, comprising an adsorption base, a transverse guide rail, a vertical guide rail, a clamping guide rail and a microphone, wherein a hollow slider is movably connected to the vertical guide rail via a pin, one end of the transverse guide rail is connected to the vertical guide rail via the hollow slider, the other end of the transverse guide rail is connected to the adsorption base, both ends of the vertical guide rail are connected to the adsorption base, a solid slider is movably connected to the vertical guide rail via a pin, the solid slider is connected to the clamping guide rail, microphone brackets are movably installed on both sides of the clamping guide, and the microphone bracket is used to fix the microphone.

[0009] Furthermore, three clamping rails of different lengths are arranged at equal intervals on the transverse rail, so as to facilitate the simultaneous measurement of noise at different positions.

[0010] Furthermore, the adsorption base is composed of a strong magnetic base, a throat clamp, and a telescopic rod. The strong magnetic base is provided with a cylinder, the telescopic rod is installed in the cylinder, and the throat clamp is installed on the cylinder to fasten the telescopic rod. The height of the vertical guide rail and the horizontal guide rail can be adjusted through the telescopic rod.

[0011] Furthermore, the angle of the microphone measurement can be changed by changing the position of the hollow slider.

[0012] Furthermore, the microphone bracket is connected to the clamping rail via a pin, and the position of the microphone is changed by changing the position of the microphone bracket on the clamping rail, so as to perform measurements at several positions.

[0013] The working process of the microphone array bracket of the utility model is as follows: the bracket is installed on the tire through the strong magnetic base of the bracket adsorption base, and the length of the telescopic rod is adjusted by changing the tightness of the throat clamp to change the height of the vertical guide rail and the horizontal guide rail. After the guide rail adjustment is completed, all the sliders in the bracket structure are moved to the appropriate position and fixed with pins. The sound signal at the wheel can be collected by running the vehicle. If multiple collections are performed at different positions, it can be done by changing the length of the telescopic rod or the position of the slider.

[0014] Compared with the prior art, the beneficial effects brought about by the technical solution of the utility model are:

[0015] The adsorption base of the microphone array bracket of the utility model adopts a telescopic rod structure, which can change the length of the adsorption base in the vertical direction and adjust the height of the guide rail. The slider of the vertical guide rail adopts a hollow structure design to ensure that when the slider moves up and down along the vertical guide rail, the transverse guide rail will also produce a certain angle change, thereby adjusting the collection position of the microphone. In order to prevent the hollow slider from being adjusted too much, causing the microphone to contact the ground, the pin connecting the bracket and the slide rail can be removed to change the layout position of the microphone on the clamping structure. Therefore, the technical solution of the utility model can more conveniently and accurately adjust the microphone array when multiple measurements are required, and when performing dynamic measurements and fixing the microphone for collection, it will not cause damage to the vehicle structure and is safer and more stable, and will not cause the microphone to slip or fall due to excessive vehicle speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the overall structure of the microphone array bracket.

[0017] Figure 2 Schematic diagram of the strong magnetic base structure of the microphone array bracket.

[0018] Figure 3 It is a schematic diagram of the connection structure between the vertical guide rail and the hollow slider.

[0019] Figure 4 It is a schematic diagram of the connection structure between the solid slider and the clamping guide rail.

[0020] Figure 5 This is the installation layout diagram for the specific application of the microphone array bracket.

[0021] Figure numerals: 1-strong magnetic base, 2-throat clamp, 3-telescopic rod, 4-screw, 5-vertical guide rail, 6-hollow slider, 7-transverse guide rail, 8-clamping guide rail, 9-microphone bracket, 10-microphone, 11 is a pin, 12-screw, 3-wheel tire, 14-microphone array bracket, 15-solid slider DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] like Figures 1 to 5As shown, the microphone array bracket 14 suitable for collecting music road acoustic signals provided in this embodiment includes an adsorption base, a transverse guide rail 7, a vertical guide rail 5, a clamping guide rail 8 and a microphone 10. The vertical guide rail 5 is movably connected with a hollow slider 6 through a pin 11. The hollow slider 6 is provided with a through hole for one end of the transverse guide rail 7 to pass through, so that the transverse guide rail 7 is connected to the vertical guide rail 5 through the hollow slider 6. The other end of the transverse guide rail 7 is connected to the adsorption base, and the two ends of the vertical guide rail 5 are connected to the adsorption base. At the same time, three solid sliders 15 are also installed on the vertical guide rail 5 through pins, and the clamping guide rail 8 is installed on the solid slider 15 through screws 12. Microphone brackets 9 are movably installed on both sides of the clamping guide through pins, and the microphone bracket 9 is used to fix the microphone 10.

[0024] See Figure 2 In this embodiment, the adsorption base is composed of a strong magnetic base 1, a throat hoop 2, and a telescopic rod 3. A cylinder is provided on the strong magnetic base 1, and the telescopic rod 3 is installed in the cylinder. A throat hoop 2 is installed on the cylinder to fasten the telescopic rod 3. The telescopic length of the telescopic rod 3 is changed by adjusting the tightness of the throat hoop 2 in the three strong magnetic bases, and a hole is dug in the upper part of the telescopic rod 3, and the telescopic rod 3 is connected to the vertical guide rail 5 by a screw 4.

[0025] Specifically, the height of the vertical guide rail 5 and the transverse guide rail 7 is adjusted by adjusting the length of the telescopic rod 3, changing the position of the hollow slider 6 on the vertical guide rail 5, adjusting the angle of the transverse guide rail 7, and changing the measuring angle of the microphone 10 on the tire.

[0026] By adjusting the positions of the three solid sliders 15 on the transverse guide rail 7, the measuring position of the microphone 10 in the horizontal direction can be changed. At the same time, the microphone bracket 9 is connected to the clamping slide rail 8 by pins. The pin structure can be removed and the bracket can be re-fixed at different positions of the clamping slide rail 8 to record the measurement results of the microphone 10 at different heights.

[0027] Specifically, the adjusted microphone array bracket 14 is installed on the vehicle tire through the strong magnetic base 1. When the vehicle passes through the existing music highway pavement structure, because the lengths of the clamping guide rail 8 are different, based on the time difference between the sound source signal reaching the two microphones, the cross-correlation function is constructed using the basic cross-correlation delay estimation algorithm to calculate the time delay of the two microphones. It is assumed that the sound source signals received by the two microphones are:

[0028] x1=s1t+n1t

[0029] x2=αs1(tD)+n2t

[0030] In the above formula, x1 and x2 are the signals picked up by the two microphones, α is the attenuation coefficient of the sound source reaching the microphone, s1t is the sound signal, n1t and n2t are the noise values ​​detected by the two microphone probes, and D is the arrival time difference of the sound signal on the two microphone sensors. Each microphone on the microphone array operates independently, and the values ​​collected by each microphone do not affect each other.

[0031] According to the cross-correlation function of x1 and x2:

[0032]

[0033] The estimated delay D is the τ value obtained when the cross-correlation function value reaches the maximum value, that is:

[0034]

[0035] In practical applications, a signal with a limited length T is collected, and the microphone signal and the sound source signal are stable and independent of each other. The cross-correlation of the two signals can be estimated using the following formula:

[0036]

[0037] The real sound source signal can be inverted, and the feasibility of laying the music pavement in the tunnel can be evaluated and designed in advance based on the inverted sound field of the existing music pavement.

[0038] The present invention is not limited to the implementation methods described above. The above description of the specific implementation methods is intended to describe and illustrate the technical solution of the present invention. The above specific implementation methods are merely illustrative and not restrictive. Without departing from the scope of protection of the present invention and the claims, ordinary technicians in this field can also make many forms of specific changes under the enlightenment of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A microphone array bracket suitable for collecting music road sound signals, characterized in that: It includes an adsorption base, a transverse guide rail, a vertical guide rail, a clamping guide rail and a microphone, the vertical guide rail is movably connected with a hollow slider via a pin, one end of the transverse guide rail is connected to the vertical guide rail via the hollow slider, the other end of the transverse guide rail is connected to the adsorption base, both ends of the vertical guide rail are connected to the adsorption base, the vertical guide rail is movably connected with a solid slider via a pin, the solid slider is connected to the clamping guide rail, microphone brackets are movably installed on both sides of the clamping guide, and the microphone bracket is used to fix the microphone.

2. The microphone array bracket suitable for collecting music road sound signals according to claim 1, characterized in that: Three clamping rails of different lengths are arranged at equal intervals on the transverse rail, so as to facilitate the simultaneous measurement of noise at different positions.

3. The microphone array bracket suitable for collecting music road sound signals according to claim 1, characterized in that: The adsorption base is composed of a strong magnetic base, a throat clamp and a telescopic rod. The strong magnetic base is provided with a cylinder, the telescopic rod is installed in the cylinder, the throat clamp is installed on the cylinder for fastening the telescopic rod, and the height of the vertical guide rail and the horizontal guide rail can be adjusted by the telescopic rod.

4. The microphone array bracket suitable for collecting music road sound signals according to claim 1, characterized in that: The angle of the microphone measurement is changed by changing the position of the hollow slider.

5. The microphone array bracket suitable for collecting music road sound signals according to claim 1, characterized in that: The microphone bracket is connected to the clamping guide rail through a pin. By changing the position of the microphone bracket on the clamping guide rail, the position of the microphone is changed to perform measurements at several positions.

6. The microphone array bracket suitable for collecting music road sound signals according to claim 1, characterized in that: The solid slider is connected to the clamping rail through a pin, and the position of the microphone is changed by changing the position of the microphone bracket on the clamping rail, so as to perform measurement at several positions.

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