Vehicle-mounted microphone pickup system

Abstract

The invention relates to the technical field of vehicle-mounted voice acquisition equipment, and provides a vehicle-mounted microphone pickup system which comprises a multi-mode sensing module, a signal fusion processing module, an active noise reduction execution module and a passive noise reduction module. The multi-mode sensing module comprises an acceleration sensor and a pickup assembly array. The signal fusion processing module comprises a vibration acoustic coupling unit and a beam forming unit. The active noise reduction execution module generates reverse sound waves according to the phase of the vibration signal and preset time, and the reverse sound waves are emitted through a headrest loudspeaker; the passive noise reduction module comprises a mounting seat arranged on the car roof and a damping support connected between the mounting seat and the pickup assembly, the damping support comprises an inner ring body connected to one side of the mounting seat and an outer ring body arranged on the outer side of the inner ring body, a damping assembly is arranged between the inner ring body and the outer ring body, and the outer ring body is connected with a cover body of the pickup assembly. The low-frequency road noise and the high-frequency wind noise are obviously improved, and the driving comfort of a user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted voice acquisition equipment, and particularly relates to a vehicle-mounted microphone pickup system. BACKGROUND

[0002] The vehicle-mounted pickup is mainly used for converting the sound in the vehicle into an electrical signal for transmission or processing, and is commonly used in voice recognition, driving recording and the like. The vehicle-mounted pickup collects the sound signal in the vehicle through a microphone, and is used for voice recognition of the input of the vehicle-mounted voice assistant or navigation instruction, recording of the sound in the driving process in the driving recording, or telephone conference or intercom communication demand.

[0003] During driving, firstly, the engine vibration will cause the microphone diaphragm assembly to vibrate through the vehicle body frame rigidity, and the structure sound transmission effect will cause the harmonic component of the voice signal to be nonlinearly distorted, specifically, the base frequency is offset and the resonance peak is distorted, which seriously affects the characteristic extraction accuracy of the voice recognition system.

[0004] Secondly, when encountering a separation belt or a poor road section, the continuous low-frequency road noise and high-frequency wind noise cover the human voice frequency band, the sound wave is reflected by the hard interior of the vehicle window to form reverberation, causing the voice tail to be superimposed and distorted. In addition, when the vehicle speed exceeds 60km / h, the air turbulence generated in the A-pillar area will form wideband wind noise, which will amplify the wind noise energy and the voice signal equally to more than 75dB, and the traditional omnidirectional microphone cannot effectively distinguish the sound source. When the vehicle window is opened, the wind noise causes serious interference in sound wave collection, and the speech intelligibility index STI will decrease significantly.

[0005] The existing technology mostly adopts an active noise reduction method to set a directional beam forming to generate a directional sound beam to focus on human voice and suppress noise, but the existing FIR filter order is generally insufficient, resulting in a large amount of residual structure noise generated by the road excitation, specifically, when driving on a rough road, the low-frequency roar can still be clearly perceived in the vehicle cabin, which is difficult to meet the quietness requirement of high-end vehicles. SUMMARY

[0006] Therefore, the present application aims to provide a vehicle-mounted microphone pickup system, which can significantly improve the low-frequency road noise and high-frequency wind noise and improve the driving comfort of users.

[0007] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0008] A vehicle-mounted microphone pickup system, a multi-modal sensing module, comprising an acceleration sensor arranged on a vehicle subframe and a plurality of pickup component arrays arranged on the roof of the vehicle, the acceleration sensor being used for collecting mechanical vibration signals;

[0009] The signal fusion processing module includes a vibration-acoustic coupling unit and a beamforming unit, the vibration-acoustic coupling unit establishes a transfer function matrix to map the vibration signal into an equivalent sound pressure, and the beamforming unit realizes adaptive noise reduction by dynamically correcting a weight vector;

[0010] The active noise reduction execution module generates a reverse sound wave according to the vibration signal phase at a predetermined time and emits the reverse sound wave through a headrest loudspeaker.

[0011] The passive noise reduction module includes a mounting seat arranged on the roof, a damping support connected between the mounting seat and the pickup assembly, the damping support includes an inner ring body connected to one side of the mounting seat, an outer ring body arranged outside the inner ring body, and a damping assembly between the inner ring body and the outer ring body, and the outer ring body is connected with a cover of the pickup assembly.

[0012] Further, the mounting seat is provided with an annular support portion protruding upward, and a circular accommodating hole is formed in the annular support portion;

[0013] The damping assembly is arranged outside the annular support portion, the cover is provided with an extension section extending downward, and the inner diameter of the extension section is matched with the diameter of the outer ring body;

[0014] An installation space is formed between the cover and the mounting seat, and the accommodating hole is arranged in the installation space.

[0015] Further, the pickup assembly includes an installation plate connected in the installation space along the radial direction of the installation plate, a main plate arranged on the installation plate, and a microphone connected to the main plate;

[0016] The cover is formed with a through air inlet, and the microphone is away from the air inlet.

[0017] Further, an extrusion plate is also inserted on the installation plate, the extrusion plate is provided with a boss corresponding to the air inlet, and the outer diameter of the boss is matched with the air inlet;

[0018] A flow-through hole is formed in the boss, and the flow-through hole is in communication with the installation space;

[0019] A waterproof sound transmission membrane is arranged between the extrusion plate and the cover to block the air inlet.

[0020] Further, a blind hole is arranged on the side of the extrusion plate facing the microphone, a windproof piece is buckled outside the microphone, and the hole diameter of the blind hole is matched with the outer shape of the windproof piece;

[0021] A waterproof net is further arranged on the microphone, a groove with one end open is formed in the windproof piece, and the microphone and the waterproof net are arranged in the groove.

[0022] Further, a plurality of through air holes are arranged on the extrusion plate corresponding to the blind holes.

[0023] Further, a plurality of support columns are formed on the extrusion plate, a plurality of threaded holes corresponding to the support columns are formed on the main plate, and the main plate is fixed on the extrusion plate through bolts.

[0024] A rubber pad is arranged between the main plate and the support column.

[0025] Further, the damping assembly comprises a plurality of annular channels formed on the inner ring body, three of the annular channels are arranged at intervals along the thickness direction of the inner ring body, a connecting channel is arranged between two adjacent annular channels, and an extension end is arranged at the connection between the connecting channel and the annular channel.

[0026] One end of the extension end is connected to the inner ring body, and the other end is connected to an equalizing pipe, the equalizing pipe is provided with an annular equalizing channel, and the extension end communicates the equalizing channel with the connecting channel.

[0027] Further, a first flow channel and a second flow channel are formed on the inner surface of the inner ring body, a notch is arranged on the inner ring body along the thickness direction, a first area communicating with the first flow channel and a second area communicating with the second flow channel are arranged in the notch.

[0028] A flexible baffle is arranged in the middle of the notch, the flexible baffle abuts against the outer ring body, when the pressure of the first flow channel is greater than that of the second flow channel, the flexible baffle is deformed by extrusion, and the first flow channel communicates with the second flow channel.

[0029] A first connecting hole communicating with the annular channel is arranged in the first area, and a second connecting hole communicating with the annular channel is arranged in the second area.

[0030] Further, the acceleration sensor is a three-axis acceleration sensor, the installation position of the acceleration sensor is at the lower swing arm connection point, near the upper side of the bearing, and the rigid area of the wheel end.

[0031] The acceleration sensor transmits data through a CAN FD bus, the delay is less than 2ms, the sampling rate is 51.2kHz, and the time alignment is realized by using an IEEE 1588v2 protocol with an acoustic signal.

[0032] Compared with the prior art, the application has the following advantages:

[0033] The vehicle-mounted microphone pickup system provided by the application collects vibration signals on the auxiliary frame through an acceleration sensor, collects sound signals in the vehicle through a pickup assembly in the vehicle, increases a passive noise reduction module, sets a mounting seat and a shock-absorbing support on the roof, and connects the pickup assembly to the shock-absorbing support, so that the pickup assembly is effectively prevented from following vibration caused by low-frequency road noise to cause a large amount of noise residue and unable to effectively remove low-frequency booming sound. Meanwhile, through the setting of an active noise reduction execution module, accurate data models can be simulated through the receiving of vibration signals and the obtaining of accurate sound signals, sound waves can be emitted through a loudspeaker, low-frequency road noise and high-frequency wind noise can be obviously improved, and the driving comfort of users is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the application, and serve as an explanation of the illustrative embodiments of the present application, and are not intended to limit the present application. In the drawings:

[0035] Figure 1 A cross-sectional view of the passive noise reduction module according to the embodiment of the present application;

[0036] Figure 2 A perspective view of the cover according to the embodiment of the present application;

[0037] Figure 3 A perspective view of the mounting seat according to the embodiment of the present application;

[0038] Figure 4 A perspective view of the extrusion plate from a first viewing angle according to the embodiment of the present application;

[0039] Figure 5 A perspective view of the extrusion plate from a second viewing angle according to the embodiment of the present application;

[0040] Figure 6 A perspective view of the inner ring body and the extension end from a first viewing angle according to the embodiment of the present application;

[0041] Figure 7 A perspective view of the inner ring body and the extension end from a second viewing angle according to the embodiment of the present application;

[0042] Figure 8 A top view of the inner ring body and the extension end according to the embodiment of the present application;

[0043] Figure 9 A cross-sectional view of the A-A according to the embodiment of the present application;

[0044] Figure 10 A Figure 7 A local enlarged view of the I.

[0045] Explanation of reference signs:

[0046] 1, mounting seat; 2, damping support; 3, cover body; 4, pickup assembly;

[0047] 101, annular support part; 102, circular accommodating hole;

[0048] 201, inner ring body; 202, outer ring body; 203, damping assembly; 204, first flow channel; 205, second flow channel; 206, notch; 207, flexible baffle; 208, first connecting hole; 209, second connecting hole;

[0049] 301, extension section; 302, mounting space; 303, air inlet;

[0050] 401, mounting plate; 402, main plate; 403, microphone; 404, extrusion plate; 405, waterproof sound transmission film; 406, windproof piece; 407, waterproof net;

[0051] 2031, annular channel; 2032, connecting channel; 2033, extension end; 2034, pressure equalizing pipe;

[0052] 2061, first region; 2062, second region;

[0053] 4041, boss; 4042, flow-through hole; 4043, blind hole; 4044, air permeation hole; 4045, support column; 4046, rubber pad. DETAILED DESCRIPTION

[0054] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0055] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection", "connector" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in conjunction with the specific circumstances.

[0057] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0058] The present embodiment relates to a vehicle-mounted microphone pickup system, which as a whole comprises a multi-modal sensing module, a signal fusion processing module, an active noise reduction execution module, and a passive noise reduction module.

[0059] The multi-modal sensing module comprises an acceleration sensor arranged on a vehicle subframe and a plurality of pickup assemblies 4 arranged in an array on the roof of the vehicle, and the acceleration sensor is configured to collect mechanical vibration signals. The signal fusion processing module comprises a vibration-acoustic coupling unit and a beamforming unit, the vibration-acoustic coupling unit establishes a transfer function matrix to map the vibration signals to equivalent sound pressures, and the beamforming unit realizes adaptive noise reduction by dynamically correcting a weight vector. The active noise reduction execution module generates reverse sound waves according to the phases of the vibration signals at a predetermined time and emits them through a headrest loudspeaker.

[0060] In addition, the passive noise reduction module comprises a mounting seat 1 arranged on the roof of the vehicle, a shock-absorbing bracket 2 connected between the mounting seat 1 and the pickup assembly 4, the shock-absorbing bracket 2 comprises an inner ring body 201 connected to one side of the mounting seat 1, an outer ring body 202 arranged on the outer side of the inner ring body 201, a shock-absorbing assembly 203 between the inner ring body 201 and the outer ring body 202, and the outer ring body 202 is connected with the cover 3 of the pickup assembly 4.

[0061] According to the above design, the vehicle-mounted microphone pickup system of the present embodiment collects vibration signals on the subframe through the acceleration sensor, and collects sound signals inside the vehicle through the pickup assembly 4 inside the vehicle. By increasing the passive noise reduction module, the mounting seat 1 and the shock-absorbing bracket 2 are arranged on the roof of the vehicle, and the pickup assembly 4 is connected to the shock-absorbing bracket 2, thereby effectively avoiding the large noise residue caused by the pickup assembly 4 following the vibration due to low-frequency road noise, and unable to effectively remove the low-frequency booming sound. At the same time, by setting the active noise reduction execution module, the received vibration signals and the obtained accurate sound signals can simulate an accurate data model, and the loudspeaker can emit sound waves, which can significantly improve the low-frequency road noise and high-frequency wind noise, and improve the user's driving comfort.

[0062] Based on the above overall introduction, an exemplary structure of the vehicle-mounted microphone pickup system of the present embodiment, the acceleration sensor is a three-axis acceleration sensor, the installation position of the acceleration sensor is at the lower swing arm connection point, near the top of the bearing, and in the rigid region of the wheel end. The acceleration sensor transmits data through the CAN FD bus with a delay of <2ms and a sampling rate of 51.2kHz, and the acoustic signals are time-aligned using the IEEE 1588v2 protocol.

[0063] Specifically, the triaxial acceleration sensor is used to collect X, Y and Z axis mechanical vibration signals, the sensor is manufactured by using silicon micro machining technology, has temperature compensation function, and can maintain a linearity of ±2% under an environment of-40℃ to 85℃. In the embodiment, the pickup assembly 4 and the mounting seat 1 are annularly mounted on the roof, and are composed of six microphone 403 units, each unit is distributed at an interval of 60° to form an omnidirectional pickup field to increase the signal-to-noise ratio.

[0064] In the signal fusion processing module, the vibration-acoustic coupling unit establishes a transfer function matrix H(s)=[hij]6×3 by an experimental modal analysis method, the matrix represents the acoustic transmission path from the vibration point to each microphone 403, can map the vibration signal to the equivalent sound pressure, and realizes digital modeling of the vibration noise.

[0065] In addition, the beamforming unit adopts a GSC beamforming unit, innovatively injects a vibration compensation term in a traditional constrained minimum variance (CMV) algorithm framework, corrects the sound field distortion error caused by the mechanical vibration of the vehicle in real time, and significantly improves the noise suppression function. Wherein, according to the real-time acquisition of the environmental noise sample, the weight coefficient is updated in real time combined with the LMS adaptive filter, the compensation term parameter is optimized by the offline system identification and the online Kalman filter, and the coherence coefficient is maintained above 90% under the dynamic conditions such as vehicle acceleration / braking, the specific operation of the GSC beamforming unit can refer to the prior art, and will not be described here.

[0066] The active noise reduction execution module generates reverse sound waves according to the vibration signal phase at a predetermined time, emits the reverse sound waves through the headrest loudspeaker to generate reverse sound waves with the same amplitude and frequency but opposite phase as the noise, so that the two are superimposed and offset each other. The active noise reduction execution module includes a digital signal processor DSP, a control algorithm, a sound wave output loudspeaker, a low-frequency loudspeaker, a noise reduction mode controller and an adaptive system, and the specific principle adopts the prior art, which will not be described here.

[0067] As a preferred embodiment, as shown in Figure 1 The mounting seat 1 is provided with an annular support part 101 protruding upward, and a circular accommodating hole 102 is formed in the inside of the annular support part 101. The damping assembly 203 is sleeved outside the annular support part 101, and the cover body 3 is provided with an extending section 301 extending downward, and the inner diameter of the extending section 301 is matched with the diameter of the outer ring body 202. An installation space 302 is formed between the cover body 3 and the mounting seat 1, and the accommodating hole is arranged in the installation space 302.

[0068] As shown in Figure 1As shown, the pickup assembly 4 includes a mounting plate 401 connected in the radial direction in the mounting space 302, a main plate 402 provided on the mounting plate 401, and a microphone 403 connected to the main plate 402. The cover 3 is formed with a through air inlet 303, and the microphone 403 is away from the air inlet 303. The pickup direction of the microphone 403 is not aligned with the air inlet 303 of the cover 3, and the microphone 403 is hidden inside the cover 3 at the side of the air inlet 303. In this way, the noise source is prevented from impacting the microphone 403 directly, thereby improving the collection quality.

[0069] As shown in Figure 2 , the mounting seat 1 and the cover 3 of the embodiment are both circular rotary structures. The upper part of the cover 3 is formed with a circular arc transition section, which improves the smoothness of sound propagation and maintains the pickup effect of the pickup assembly 4.

[0070] As shown in Figure 1 , Figure 4 , Figure 5 , the mounting plate 401 is also inserted with an extrusion plate 404. The extrusion plate 404 is provided with a boss 4041 corresponding to the air inlet 303. The outer diameter of the boss 4041 is matched with the air inlet 303. The boss 4041 is formed with a flow hole 4042 inside. The flow hole 4042 is communicated with the mounting space 302. The extrusion plate 404 and the cover 3 are provided with a waterproof sound transmission film 405 for blocking the air inlet 303. In the embodiment, the waterproof sound transmission film 405 is made of PTFE film, which effectively blocks liquid water and has a protection level of IP67. The waterproof sound transmission film 405 ensures that the sound propagation is not hindered, maintains the original sound quality, allows water vapor to be discharged, and ensures that the microphone 403 unit is not affected by the environment to collect distortion.

[0071] In addition, as shown in 4 and Figure 5 , the side of the extrusion plate 404 facing the microphone 403 is provided with a blind hole 4043. The outer side of the microphone 403 is buckled with a windproof piece 406. The hole diameter of the blind hole 4043 is matched with the outer shape of the windproof piece 406. The upper part of the microphone 403 is also provided with a waterproof net 407. The windproof piece 406 is formed with a groove with one end open. The microphone 403 and the waterproof net 407 are both arranged in the groove. The windproof piece 406 of the embodiment is made of windproof cotton sleeve to reduce wind noise. By arranging the waterproof net 407 on the upper part of the microphone 403, the microphone 403 is further protected to ensure the collection effect.

[0072] In addition, as shown in Figure 1As shown, the extrusion plate 404 is provided with a plurality of through air holes 4044 corresponding to the blind hole 4043. The waterproof sound transmission film 405 in this embodiment is covered outside the boss 4041 and located in the air inlet 303, so that the waterproof sound transmission film 405 is arranged between the cover 3 and the extrusion plate 404. The sound passing through the air inlet 303 needs to pass through the waterproof sound transmission film 405 first, most of which enters the installation space 302 through the flow-through hole 4042 and is then captured by the microphone 403. Another part of the sound enters the air hole 4044 through the gap between the extrusion plate 404 and the cover 3 and is captured by the microphone 403 through the air hole 4044. This allows the microphone 403 to capture sound signals from all directions and send the sound signals to the active noise reduction execution module for real-time adjustment of the reverse sound waves to increase the noise reduction effect.

[0073] As a preferred embodiment, as shown in Figure 1 and Figure 5 As shown, the extrusion plate 404 is provided with a plurality of support columns 4045, and the main plate 402 is provided with threaded holes corresponding to the support columns 4045. The main plate 402 is fixed to the extrusion plate 404 by bolts, and a rubber pad 4046 is arranged between the main plate 402 and the support column 4045. By arranging the support column 4045, the accuracy and stability of the installation position of the main plate 402 are improved. The rubber pad 4046 further buffers the microphone 403 on the main plate 402, reduces the vibration caused by the road surface excitation, and improves the sound pickup accuracy of the microphone 403.

[0074] As shown in Figure 1 and Figure 9 The damping assembly 203 includes a plurality of annular channels 2031 formed on the inner ring body 201. Three annular channels 2031 are arranged at intervals along the thickness direction of the inner ring body 201. A connecting channel 2032 is arranged between two adjacent annular channels 2031. The connecting channel 2032 is connected to the annular channel 2031 at an extension end 2033. The extension end 2033 is connected to the inner ring body 201 at one end and is connected to an equalizing pipe 2034 at the other end. The equalizing pipe 2034 is provided with an annular equalizing channel. The extension end 2033 connects the equalizing channel and the connecting channel 2032. By arranging the equalizing channel and the three annular channels 2031 and connecting them through the connecting channel 2032, the inner ring body 201 and the outer ring body 202 are uniformly pressurized. When the mounting seat 1 is shaken with the roof frame, the road surface vibration force is gradually absorbed through the above channel arrangement. When a certain part is under high pressure, the pressure is adjusted through the connection of the channels at different positions. The outer ring body 202 and the inner ring body 201 always maintain a constant pressure, thereby avoiding the shaking of the cover 3 and the microphone 403 on the outer ring body 202.

[0075] The hydraulic oil is filled between the channels in the embodiment, the hydraulic system can automatically adjust the damping force according to the impact speed, when the road excitation is strong, the damping force is enhanced with the speed, the high-frequency vibration and overshoot are effectively inhibited, and the impact of the cover body 3 is reduced.

[0076] In addition, as shown in Figure 7 and Figure 10 The inner ring body 201 is provided with a first flow channel 204 and a second flow channel 205 which are recessed inward on the outer surface, a notch 206 which penetrates along the thickness direction of the inner ring body 201, a first area 2061 which communicates with the first flow channel 204 in the notch 206, and a second area 2062 which communicates with the second flow channel 205 in the notch 206. A flexible baffle 207 is arranged in the middle of the notch 206, and the flexible baffle 207 abuts against the outer ring body 202. When the pressure of the first flow channel 204 is greater than that of the second flow channel 205, the flexible baffle 207 is deformed by being pressed, and the first flow channel 204 communicates with the second flow channel 205. The first area 2061 is provided with a first connecting hole 208 which communicates with the annular channel 2031, and the second area 2062 is provided with a second connecting hole 209 which communicates with the annular channel 2031.

[0077] Through the above arrangement, the annular pressure equalization can be formed between the inner ring body 201 and the outer ring body 202, that is, the first flow channel 204 and the second flow channel 205 are arranged, as shown in Figure 6 to Figure 7 The first channel and the second channel communicate, and the flexible baffle 207 at the notch 206 blocks. When the pressure on one side is too large, the deformation of the flexible baffle 207 can quickly balance the pressure on both sides, thereby achieving the effect of quickly reducing the excitation vibration, and ensuring that the microphone 403 stably collects signals.

[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle-mounted microphone pickup system, characterized by: A multimodal sensing module comprises an acceleration sensor disposed on a vehicle subframe and an array of a plurality of sound pickup components (4) disposed on a vehicle roof, wherein the acceleration sensor is used to collect mechanical vibration signals; A signal fusion processing module includes a vibroacoustic coupling unit and a beamforming unit. The vibroacoustic coupling unit establishes a transfer function matrix to map the vibration signal to equivalent sound pressure. The beamforming unit implements adaptive noise reduction by dynamically modifying a weight vector. an active noise reduction execution module, generating a reverse sound wave at a predetermined time according to the phase of the vibration signal and transmitting the reverse sound wave through the headrest speaker; A passive noise reduction module comprises a mounting seat (1) arranged on a vehicle roof, a shock-absorbing bracket (2) connected between the mounting seat (1) and the sound pickup assembly (4), the shock-absorbing bracket (2) comprising an inner ring body (201) connected to one side of the mounting seat (1), an outer ring body (202) arranged outside the inner ring body (201), a shock-absorbing assembly (203) between the inner ring body (201) and the outer ring body (202), and the outer ring body (202) connected to a cover body (3) of the sound pickup assembly (4).

2. The vehicle-mounted microphone pickup system according to claim 1, characterized in that: The mounting seat (1) is provided with an upwardly protruding annular support portion (101), and a circular receiving hole (102) is formed inside the annular support portion (101); The shock absorbing assembly (203) is sleeved on the outside of the annular support portion (101), and the cover body (3) is provided with an extension section (301) extending downward, and the inner diameter of the extension section (301) is adapted to the diameter of the outer ring body (202); An installation space (302) is formed between the cover body (3) and the installation seat (1), and the accommodating hole is provided in the installation space (302).

3. The vehicle-mounted microphone pickup system according to claim 2, characterized in that: The sound pickup assembly (4) comprises a mounting plate (401) connected radially within the mounting space (302), a main board (402) disposed on the mounting plate (401), and a microphone (403) connected to the main board (402); The cover (3) is formed with a through air inlet (303), and the microphone (403) is far away from the air inlet (303).

4. The vehicle-mounted microphone pickup system according to claim 3, characterized in that: The mounting plate (401) is further plugged with an extrusion plate (404), and the extrusion plate (404) is provided with a boss (4041) corresponding to the air inlet (303), and the outer diameter of the boss (4041) is adapted to the air inlet (303); A circulation hole (4042) is formed in the boss (4041), and the circulation hole (4042) is communicated with the installation space (302); A waterproof and sound-permeable membrane (405) is provided between the extrusion plate (404) and the cover body (3) to seal the air inlet (303).

5. The vehicle-mounted microphone pickup system according to claim 4, characterized in that: A blind hole (4043) is provided on a side of the extrusion plate (404) facing the microphone (403); a windshield (406) is provided on the outer side of the microphone (403); and the aperture of the blind hole (4043) is adapted to the shape of the windshield (406); A waterproof net (407) is also provided on the upper portion of the microphone (403), and a groove with an open end is formed in the windproof member (406), and the microphone (403) and the waterproof net (407) are both arranged in the groove.

6. The vehicle-mounted microphone pickup system according to claim 5, characterized in that: A plurality of through-going air holes (4044) are provided at positions corresponding to the extrusion plate (404) and the blind holes (4043).

7. The vehicle-mounted microphone pickup system according to claim 6, characterized in that: A plurality of support columns (4045) are formed on the extrusion plate (404), threaded holes corresponding to the support columns (4045) are formed on the main plate (402), and the main plate (402) is fixed to the extrusion plate (404) by bolts; A rubber pad (4046) is provided between the mainboard (402) and the support column (4045).

8. The vehicle-mounted microphone pickup system according to claim 1, characterized in that: The shock absorbing assembly (203) comprises a plurality of annular channels (2031) formed on the inner ring body (201), wherein three of the annular channels (2031) are arranged at intervals along the thickness direction of the inner ring body (201), a connecting channel (2032) is provided between two adjacent annular channels (2031), and an extending end (2033) is provided at the connection between the connecting channel (2032) and the annular channel (2031); One end of the plurality of extension ends (2033) is connected to the inner ring body (201), and the other end is connected to a pressure equalizing tube (2034), wherein an annular pressure equalizing channel is provided in the pressure equalizing tube (2034), and the extension end (2033) connects the pressure equalizing channel with the connecting channel (2032).

9. The vehicle-mounted microphone pickup system according to claim 8, characterized in that: The outer surface of the inner ring body (201) is formed with a first circulation channel (204) and a second circulation channel (205) that are recessed inwards. The inner ring body (201) is provided with a notch (206) that passes through along its thickness direction. The notch (206) is provided with a first region (2061) that communicates with the first circulation channel (204) and a second region (2062) that communicates with the second circulation channel (205). A flexible baffle (207) is provided in the middle of the notch (206), and the flexible baffle (207) abuts against the outer ring body (202). When the pressure of the first circulation channel (204) is greater than that of the second circulation channel (205), the flexible baffle (207) is squeezed and deformed, and the first circulation channel (204) is communicated with the second circulation channel (205). A first connecting hole (208) communicating with the annular channel (2031) is provided in the first region (2061), and a second connecting hole (209) communicating with the annular channel (2031) is provided in the second region (2062).

10. The vehicle-mounted microphone pickup system according to claim 1, characterized in that: The acceleration sensor is a three-axis acceleration sensor, and the installation position of the acceleration sensor is at the connection point of the lower arm, close to the top of the bearing, and the rigid area of ​​the wheel end; The acceleration sensor transmits data via the CAN FD bus with a delay of less than 2ms and a sampling rate of 51.2kHz, and is time-aligned with the acoustic signal using the IEEE 1588v2 protocol.

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