Sound field acquisition device

Abstract

The utility model relates to the technical field of audio processing, and provides a sound field acquisition device, which comprises a lifting piece, a driving seat and a microphone array, the lifting part is connected with the driving seat to drive the driving seat to lift, and the driving seat is connected with the microphone array to drive the microphone array to move. The sound field acquisition device provided by the utility model can realize acquisition of a sound field in a three-dimensional space and accurate spatial positioning, has good consistency for repeated measurement of multiple groups of measurement times, and improves the measurement precision and acquisition efficiency of the sound field.

Description

Technical Field

[0001] This utility model relates to the field of audio processing technology, and in particular to a sound field acquisition device. Background Technology

[0002] In the field of audio effects, microphones are typically used to collect sound field data in order to analyze the sound field, which serves as an important basis for adjusting the sound effects of audio equipment.

[0003] Existing sound field acquisition devices are generally divided into two types. One type uses a mono microphone to traverse and disturb within a certain spatial range to obtain sound field information at various locations in the space. This method is not precise in terms of position control, and if multiple tests are performed, it is difficult to ensure the consistency of measurement results, making it unsuitable for situations where the sound field adjustment effect needs to be repeatedly verified. The other type of sound field acquisition device uses a microphone array device with fixed positions to acquire sound field data. This method can obtain effective sound field data, and the consistency of different tests is also good when multiple tests are performed. However, the position and number of test points cannot be flexibly adjusted, resulting in insufficient accuracy of sound field acquisition. Utility Model Content

[0004] This invention provides a sound field acquisition device to solve the problem that existing sound field acquisition devices are difficult to adjust the accuracy of sound field acquisition as needed.

[0005] This utility model provides a sound field acquisition device, including: a lifting component, a drive base, and a microphone array;

[0006] The lifting component is connected to the drive seat to drive the drive seat to rise and fall, and the drive seat is connected to the microphone array to drive the microphone array to move.

[0007] According to the present invention, a sound field acquisition device is provided, wherein the driving base is used to drive the microphone array to move in a straight line.

[0008] According to the sound field acquisition device provided by this utility model, the moving direction of the microphone array is inclined relative to the horizontal plane and perpendicular to the arrangement direction of the multiple microphones corresponding to the microphone array.

[0009] According to the sound field acquisition device provided by this utility model, the tilt angle of the moving direction of the microphone array relative to the horizontal plane is 28° to 32°.

[0010] According to the sound field acquisition device provided by this utility model, the drive base includes a slide rail, a slider and a belt conveyor assembly;

[0011] The slide rail is connected to the lifting component, the belt conveyor assembly is located beside the slide rail, the conveying direction of the belt conveyor assembly is parallel to the extension direction of the slide rail, the belt conveyor assembly is connected to the slider to drive the slider to move along the extension direction of the slide rail, and the microphone array assembly is connected to the slider.

[0012] According to the sound field acquisition device provided by this utility model, the belt conveyor assembly includes: a belt, a pulley, and a drive motor;

[0013] The drive motor is connected to the slide rail. Multiple pulleys are provided, and the multiple pulleys are located on one side of the slide rail. One of the multiple pulleys is connected to the drive motor. The belt is wound around the multiple pulleys and connected to the slider.

[0014] According to the sound field acquisition device provided by this utility model, the drive base further includes: a position sensor;

[0015] The position sensor is used to detect the position information of the slider relative to the slide rail, and the position sensor is electrically connected to the belt conveyor assembly.

[0016] The belt conveyor assembly is configured to control the movement position of the slider based on the position information fed back by the position sensor.

[0017] According to the present invention, a sound field acquisition device is provided, wherein the microphone array assembly includes a support rod and multiple microphones;

[0018] The support rod is connected to the drive base, and the multiple microphones are spaced apart from each other and arranged side by side on the support rod.

[0019] According to the present invention, a sound field acquisition device is provided, wherein the lifting component includes a base and a telescopic rod, the base is configured to be connected to a fixed foundation, the first end of the telescopic rod is connected to the base, and the second end of the telescopic rod is connected to the drive seat.

[0020] According to the sound field acquisition device provided by this utility model, the telescopic rod includes a first rod body, a second rod body, and a locking member;

[0021] The first rod and the second rod are slidably engaged, and the locking member is used to lock the first rod and the second rod.

[0022] According to the sound field acquisition device provided by this utility model, the base is provided with a groove, and the first end of the telescopic rod is inserted into the groove;

[0023] The groove wall is provided with a first limiting structure, and the peripheral wall of the telescopic rod is provided with a second limiting structure. The first limiting structure and the second limiting structure abut against each other along the circumference of the telescopic rod to prevent the telescopic rod from rotating relative to the base.

[0024] According to the sound field acquisition device provided by this utility model, the lifting component further includes a counterweight block, which is disposed on the base.

[0025] The sound field acquisition device provided by this utility model acquires sound fields by setting up a microphone array. It also includes a lifting component and a drive base. The lifting component moves the microphone array in the height direction, and the drive base drives the microphone array to change its acquisition position, thereby realizing the acquisition of sound fields in three-dimensional space. The drive base controls the movement of the microphone array to achieve precise spatial positioning. It has good consistency for repeated measurements with multiple sets of measurements, thus improving the accuracy and acquisition efficiency of sound field measurement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this utility model or the prior art, the following will describe the actual situation.

[0027] The accompanying drawings used in the description of the embodiments or prior art are briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of the sound field acquisition device provided by this utility model.

[0029] Figure 2 This is a side view of the sound field acquisition device provided by this utility model.

[0030] Figure 3 This is a front view of the sound field acquisition device provided by this utility model.

[0031] Figure 4 This is a three-dimensional structural diagram of the microphone array provided by this utility model mounted on the driver mount.

[0032] Figure label:

[0033] 1. Lifting component; 11. Base; 12. Telescopic rod; 13. Counterweight; 14. Controller; 121. First rod body; 122. Second rod body; 123. Locking component;

[0034] 2. Drive base; 21. Slide rail; 22. Slider; 23. Belt drive assembly; 24. Position sensor; 231. Belt; 232. Pulley; 233. Drive motor;

[0035] 3. Microphone array; 31. Support rod; 32. Microphone; 33. Connector. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] The following is combined with Figures 1-4 The sound field acquisition device provided by the present invention will be described in detail through specific embodiments and application scenarios.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a sound field acquisition device, including: a lifting component 1, a drive base 2, and a microphone array 3.

[0039] The lifting component 1 is connected to the drive base 2 to drive the drive base 2 to rise and fall. The drive base 2 is connected to the microphone array 3 to drive the microphone array 3 to move.

[0040] Understandably, the microphone array 3 is equipped with multiple microphones 32, which are spaced apart and used to collect the sound field of the space corresponding to the microphone array 3.

[0041] The lifting component 1 can change the height of the drive base 2, facilitating the microphone array 3 to collect sound at different heights. Furthermore, the drive base 2 can also drive the microphone array 3 to move, facilitating the microphone array 3 to collect sound from different positions. Thus, the sound field acquisition device achieves the acquisition of a sound field in three-dimensional space by collecting sound at different heights and positions.

[0042] Specifically, the movement of microphone array 3 can be along a straight line, a curve, or a circle.

[0043] Optionally, the drive base 2 can drive the microphone array 3 to move linearly via a linear module, or drive the microphone array 3 to move in a curved path via a crank-connecting rod mechanism, or drive the microphone array 3 to move in a circular path via a motor-driven slide along a circular guide rail.

[0044] The sound field acquisition device in this embodiment is equipped with a controller 14, which is electrically connected to the drive base 2 and the microphone array 3. The controller 14 is used to control the drive base 2 to move the microphone array 3 and to acquire the sound field signals acquired by the microphone array 3. Since the controller 14 can automatically control the drive base 2 to move the microphone array 3, the microphone array 3 can automatically complete the sound field acquisition under different moving distances and different moving times, reducing manual intervention and improving the efficiency of sound field acquisition.

[0045] Specifically, the lifting component 1 can be a lead screw module or a moving guide rail. The lifting component 1 can be in a manual mode for manual adjustment or in an automatic control mode.

[0046] The sound field acquisition device provided by this utility model acquires sound fields by setting up a microphone array 3. It also includes a lifting component 1 and a drive base 2. The lifting component 1 drives the microphone array 3 to move in the height direction, and the drive base 2 drives the microphone array 3 to change its acquisition position, thereby realizing the acquisition of sound fields in three-dimensional space. The movement control of the microphone array 3 by the drive base 2 accurately achieves spatial positioning. It has good consistency for repeated measurements with multiple measurement requirements, thus improving the accuracy and acquisition efficiency of sound field measurement.

[0047] like Figure 1 and Figure 2 As shown, the drive base 2 in this embodiment is used to drive the microphone array 3 to move in a straight line.

[0048] Understandably, the microphone array 3 moves in a straight line, enabling it to collect sound fields along a straight line. The linearly moving microphone array 3 can better focus on sound sources in a certain direction, thereby enhancing the sound in that specific direction. Furthermore, the linear movement ensures that the microphone 32 covers the sound field more evenly during the movement, avoiding the problem of uneven sound field coverage caused by non-linear movement, which is more conducive to high-precision sound field acquisition.

[0049] like Figure 1 and Figure 2 As shown, the moving direction of the microphone array 3 in this embodiment is tilted relative to the horizontal plane and perpendicular to the arrangement direction of the plurality of microphones 32 corresponding to the microphone array 3.

[0050] Understandably, the tilted orientation of microphone array 3, relative to the horizontal plane, better matches the spatial shape of the vehicle cabin. Moving microphone array 3 in this tilted direction facilitates the acquisition of the sound field within the cabin. Furthermore, the perpendicular orientation of the microphone array 3 to the arrangement of the multiple microphones 32 allows them to synchronously change their linear positions within the space, simultaneously acquiring sound within their moving range, resulting in a larger number of sound field acquisition points and higher efficiency.

[0051] like Figure 1 As shown, the tilt angle of the microphone array 3 relative to the horizontal plane in this embodiment is 28° to 32°.

[0052] Understandably, in order to match the sound field inside the vehicle cabin, the tilt angle of the moving direction of the microphone array 3 relative to the horizontal plane in this embodiment simulates the spatial tilt angle inside the vehicle cabin, and controls the lifting height range of the lifting component 1 and the driving control of the driving seat 2 on the moving distance of the microphone array 3.

[0053] Specifically, the tilt angle of the moving direction of the microphone array 3 relative to the horizontal plane can be 28°, 30°, or 32°.

[0054] The height adjustment range of the lifting component 1 is 65cm to 75cm, and the movement distance of the microphone array 3 is 0 to 40cm.

[0055] This embodiment, by adjusting the height range of the microphone array 3, its tilt angle relative to the horizontal plane, and its moving distance relative to the horizontal plane, better matches the three-dimensional space of the sound field in the vehicle cabin, which is beneficial for simulating the sound field of the vehicle cabin and collecting data.

[0056] like Figure 1 and Figure 4 As shown, the drive seat 2 in this embodiment includes a slide rail 21, a slider 22, and a belt conveyor assembly 23.

[0057] The slide rail 21 is connected to the lifting component 1. The belt conveyor assembly 23 is located on the side of the slide rail 21. The conveying direction of the belt conveyor assembly 23 is parallel to the extension direction of the slide rail 21. The belt conveyor assembly 23 is connected to the slider 22 to drive the slider 22 to move along the extension direction of the slide rail 21. The microphone array 3 assembly is connected to the slider 22.

[0058] Understandably, the belt conveyor assembly 23 provides driving force to the slider 22, which in turn drives the microphone array 3 to move along the slide rail 21. The slide rail 21 provides positioning and support for the movement of the slider 22, and the microphone array 3 reciprocates along the extension direction of the slide rail 21. Because the belt conveyor assembly 23 operates smoothly and with low noise, it is more suitable for driving the microphone array 3, avoiding interference with the sound pickup of the microphone 32.

[0059] like Figure 4 As shown, the belt conveyor assembly 23 in this embodiment includes: belt 231, pulley 232 and drive motor 233.

[0060] The drive motor 233 is connected to the slide rail 21. Multiple pulleys 232 are provided, and the multiple pulleys 232 are located on one side of the slide rail 21. One of the multiple pulleys 232 is connected to the drive motor 233. The belt 231 is wound between the multiple pulleys 232 and is connected to the slider 22.

[0061] Understandably, in this embodiment, the drive motor 233 is mounted on the side of the middle part of the slide rail 21. The drive motor 233 transmits power through the connected pulley 232, driving the pulley 232 to rotate, and the pulley 232 drives the belt 231 to move. The slider 22 moves along the slide rail 21 under the drive of the belt 231, thereby driving the microphone array 3 to move along the slide rail 21.

[0062] In this embodiment, the driving direction of the drive motor 233 can control the conveying direction of the belt 231, thereby realizing the conversion of the moving direction of the microphone array 3; the start and stop of the drive motor 233 can control the start and stop of the conveying action of the belt 231, thereby realizing the control of the number of times the microphone array 3 moves.

[0063] Specifically, the drive motor 233 can be a stepper motor, which can precisely control the rotation angle of the pulley 232, thereby achieving precise control of the moving distance of the microphone array 3.

[0064] like Figure 4 As shown, the drive seat 2 in this embodiment also includes a position sensor 24.

[0065] The position sensor 24 is used to detect the position information of the slider 22 relative to the slide rail 21. The position sensor 24 is electrically connected to the belt conveyor assembly 23.

[0066] The belt conveyor assembly 23 is configured to control the movement position of the slider 22 based on the position information fed back by the position sensor 24.

[0067] Understandably, the position sensor 24 can detect the position of the slider 22 relative to the slide rail 21, thereby obtaining the position of the microphone array 3 relative to the slide rail 21. Since the position sensor 24 is electrically connected to the belt conveyor assembly 23, it can feed back the position information of the slider 22 to the belt conveyor assembly 23. Based on the moving position of the microphone array 3, the belt conveyor assembly 23 controls its start / stop and speed, thus precisely controlling the moving position, speed, and number of reciprocating movements of the microphone array 3. This embodiment achieves precise control of the movement of the microphone array 3 through closed-loop control of the position sensor 24 and the belt conveyor assembly 23.

[0068] Furthermore, the position sensor 24 can be an arrival detection sensor, which is located at the end of the slide rail 21. When the arrival detection sensor detects that the microphone array 3 has moved to the end of the slide rail 21, it sends this information to the belt conveyor assembly 23. The belt conveyor assembly 23 then controls the slider 22 to stop, thereby stopping the movement of the microphone array 3 and preventing the microphone array 3 from slipping off the slide rail 21.

[0069] Optionally, the position detection sensor can be a laser sensor.

[0070] like Figure 4 As shown, the microphone array 3 component in this embodiment includes a support rod 31 and a plurality of microphones 32.

[0071] The support rod 31 is connected to the drive base 2, and multiple microphones 32 are spaced apart from each other and arranged side by side on the support rod 31.

[0072] Understandably, in this embodiment, the support rod 31 provides a mounting support for multiple microphones 32. The support rod 31 is connected to the slider 22. Driven by the slider 22, the support rod 31 drives multiple microphones 32 to move along the extension direction of the slide rail 21, so as to realize the movement and adjustment of the acquisition position of multiple microphones 32.

[0073] Optionally, the microphone 32 and the support rod 31 are connected via a connector 33, which can be a BNC connector (Bayonet-Neill-Concelman). The BNC connector uses a snap-fit ​​connection, which allows for a quick and reliable connection between the microphone 32 and the support rod 31 by rotating and pressing.

[0074] like Figure 1 As shown, the lifting component 1 in this embodiment includes a base 11 and a telescopic rod 12. The base 11 is configured to be connected to a fixed foundation, the first end of the telescopic rod 12 is connected to the base 11, and the second end of the telescopic rod 12 is connected to the drive seat 2.

[0075] Understandably, the mounting base for the sound field acquisition device can be the ground or the chassis inside a car.

[0076] The telescopic rod 12 can adjust the height based on the extension and retraction of different rods. By changing the distance between the telescopic rod 12 and the base 11, the height of the drive seat 2 and the base 11 can be adjusted. The structure is simple, easy to install, and the adjustment process is also relatively simple.

[0077] Optionally, the telescopic rod 12 is equipped with a scale, which is set in the vertical direction and can display the telescopic distance of the telescopic rod 12, so as to facilitate the precise adjustment of the height of the microphone array 3.

[0078] like Figure 2 As shown, the telescopic rod 12 in this embodiment includes a first rod body 121, a second rod body 122, and a locking member 123.

[0079] The first rod 121 and the second rod 122 are slidably engaged, and the locking member 123 is used to achieve the locking connection between the first rod 121 and the second rod 122.

[0080] Understandably, the first rod 121 is connected to the drive seat 2, and the second rod 122 is connected to the base 11. The first rod 121 and the second rod 122 slide relative to each other. After the position of the first rod 121 relative to the second rod 122 is adjusted, the locking member 123 connects the first rod 121 and the second rod 122 to achieve the purpose of changing the length of the telescopic rod 12.

[0081] In some embodiments, the first rod 121 and the second rod 122 are sleeved together and slide together. A locking member 123 is provided at the connection between the first rod 121 and the second rod 122. The locking member 123 can lock and release the first rod 121 and the second rod 122 to switch between the telescopic rod 12's telescopic state and its fixed state.

[0082] Specifically, the locking component 123 includes a locking ring and a locking knob. The locking ring is sleeved on the periphery of the connection between the first rod 121 and the second rod 122. The locking knob is connected to the locking ring. The locking ring can be locked and released by the operator by turning the locking knob.

[0083] like Figure 1 As shown, the base 11 of this embodiment is provided with a groove, and the first end of the telescopic rod 12 is inserted into the groove.

[0084] The groove wall is provided with a first limiting structure, and the peripheral wall of the telescopic rod 12 is provided with a second limiting structure. The first limiting structure and the second limiting structure abut against each other along the circumference of the telescopic rod 12 to prevent the telescopic rod 12 from rotating relative to the base 11.

[0085] Understandably, to prevent the first end of the telescopic rod 12 from rotating around the groove, this embodiment provides a first limiting structure on the groove wall and a second limiting structure on the peripheral wall of the telescopic rod 12. Specifically, the first limiting structure can be a positioning hole, and the second limiting structure can be a positioning pin. When the first end of the telescopic rod 12 is inserted into the groove, the positioning pin extends into the positioning hole, restricting the rotation of the telescopic rod 12 relative to the base 11.

[0086] like Figure 1 As shown, the lifting component 1 in this embodiment also includes a counterweight 13, which is disposed on the base 11.

[0087] Understandably, to ensure the stability of the sound field acquisition device, this embodiment also provides a counterweight 13 on the base 11. The counterweight 13 increases the weight of the base 11, lowers the center of gravity of the sound field acquisition device, and avoids instability caused by the weight of the drive seat 2 and microphone array 3 being greater than that of the base 11. In particular, during the process of the microphone array 3 moving along the drive seat 2, the counterweight 13 can compensate for the imbalance of mass distribution and reduce the shaking of the microphone array 3 during the movement.

[0088] Alternatively, the counterweight 13 may be made of cast iron, cast steel or lead.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sound field acquisition device, characterized in that, include: Lifting components, drive unit, and microphone array; The lifting component is connected to the drive seat to drive the drive seat to rise and fall, and the drive seat is connected to the microphone array to drive the microphone array to move.

2. The sound field acquisition device according to claim 1, characterized in that, The drive unit is used to drive the microphone array to move in a straight line.

3. The sound field acquisition device according to claim 1, characterized in that, The direction of movement of the microphone array is tilted relative to the horizontal plane and perpendicular to the arrangement direction of the multiple microphones corresponding to the microphone array.

4. The sound field acquisition device according to claim 3, characterized in that, The direction of movement of the microphone array is tilted at an angle of 28° to 32° relative to the horizontal plane.

5. The sound field acquisition device according to claim 1, characterized in that, The drive unit includes a slide rail, a slider, and a belt conveyor assembly; The slide rail is connected to the lifting component, the belt conveyor assembly is located beside the slide rail, the conveying direction of the belt conveyor assembly is parallel to the extension direction of the slide rail, the belt conveyor assembly is connected to the slider to drive the slider to move along the extension direction of the slide rail, and the microphone array assembly is connected to the slider.

6. The sound field acquisition device according to claim 5, characterized in that, The belt conveyor assembly includes: a belt, pulleys, and a drive motor; The drive motor is connected to the slide rail. Multiple pulleys are provided, and the multiple pulleys are located on one side of the slide rail. One of the multiple pulleys is connected to the drive motor. The belt is wound around the multiple pulleys and connected to the slider.

7. The sound field acquisition device according to claim 5, characterized in that, The drive unit also includes: a position sensor; The position sensor is used to detect the position information of the slider relative to the slide rail, and the position sensor is electrically connected to the belt conveyor assembly. The belt conveyor assembly is configured to control the movement position of the slider based on the position information fed back by the position sensor.

8. The sound field acquisition device according to claim 1, characterized in that, The microphone array assembly includes a support rod and multiple microphones; The support rod is connected to the drive seat, and the multiple microphones are spaced apart from each other and arranged side by side on the support rod.

9. The sound field acquisition device according to claim 1, characterized in that, The lifting component includes a base and a telescopic rod. The base is configured to be connected to a fixed foundation. A first end of the telescopic rod is connected to the base, and a second end of the telescopic rod is connected to the drive seat.

10. The sound field acquisition device according to claim 9, characterized in that, The telescopic rod includes a first rod body, a second rod body, and a locking element; The first rod and the second rod are slidably engaged, and the locking member is used to lock the first rod and the second rod.

11. The sound field acquisition device according to claim 9, characterized in that, The base is provided with a groove, and the first end of the telescopic rod is inserted into the groove; The groove wall is provided with a first limiting structure, and the peripheral wall of the telescopic rod is provided with a second limiting structure. The first limiting structure and the second limiting structure abut against each other along the circumference of the telescopic rod to prevent the telescopic rod from rotating relative to the base.

12. The sound field acquisition device according to claim 9, characterized in that, The lifting component also includes a counterweight block, which is disposed on the base.

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