Device for testing directivity of electret microphone

Abstract

The utility model provides a device for testing directivity of an electret microphone, which comprises a bottom table and a support connected to the top of the bottom table through a lifting assembly, the inner wall of the top of the bottom table is rotatably connected with a turntable, the top of the turntable is provided with a clamping assembly for fixing the electret microphone, and the clamping assembly is connected with the lifting assembly. Two symmetrically-arranged vacuum tubes are fixed to the top of the bottom table through bolts, a sounder and a sound receiver are fixedly connected to the inner walls of the two vacuum tubes correspondingly, a rotating shaft is fixedly connected to the bottom of the clamping assembly, and the other end of the rotating shaft is fixedly connected with a first motor through a coupler. Through arrangement of the turntable, the rotating shaft and the first motor, the direction of the electret microphone can be changed under transmission cooperation of the turntable, the rotating shaft and the first motor, compared with manual operation, the accuracy is higher, the test precision is improved, a vacuum tube is arranged, a stronger output signal can be generated, and the test efficiency is improved. And the accuracy of the test result cannot be influenced by attenuation of the sound wave in the transmission process.

Description

Technical Field

[0001] The utility model relates to a device for testing the directivity of an electret microphone, in particular to a device for testing the directivity of an electret microphone, and belongs to the technical field of electret microphones. Background Art

[0002] Electret microphones, as an acoustic-to-electrical transducer, are widely used in various audio devices, such as microphones and hearing aids. Their directivity refers to the microphone's ability to respond to sound waves in different directions, which is crucial for improving the sound pickup and sound quality of audio equipment. When conducting directivity tests, the test environment should be quiet and stable to avoid external noise and interference that may affect the test results.

[0003] A search revealed Chinese patent publication number CN201167417Y, which discloses a test device for unidirectional microphones. The device comprises a first sound-emitting device that emits sound to the microphone under test and a tester that outputs an audio signal. The device also comprises a second sound-emitting device and a controller, wherein the second sound-emitting device is directly opposite the sound-emitting direction of the first sound-emitting device, and the first and second sound-emitting devices are located at 0 and 180 degrees relative to the test direction of the microphone under test. The controller connects the first and second sound-emitting devices to the tester, transmits the audio signal output by the tester to the first and second sound-emitting devices, and controls the first and second sound-emitting devices to alternately emit sound. This utility model reduces testing costs, replaces a large amount of manual microphone steering operations, improves testing efficiency, and is suitable for the testing needs of large-scale production lines.

[0004] A device for testing the directivity of an electret microphone in the above-mentioned patent has the following shortcomings: the device tests the device by placing a sound-emitting device in two directions, but this can only test the device in the directions of 0 degrees and 180 degrees. Such a testing device cannot test other directions of the required test device, resulting in increased limitations.

[0005] Therefore, a device for testing the directivity of an electret microphone is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a device for testing the directivity of an electret microphone. The turntable, the rotating shaft, and the first motor can change the direction of the electret microphone through the transmission cooperation of the three. Compared with manual operation, the accuracy is higher, and the accuracy of the test is improved. In addition, the provision of a vacuum tube can generate a more powerful output signal, ensuring that the accuracy of the test results is not affected by attenuation of the sound wave during the transmission process.

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the present invention include: a base and a bracket connected to the top of the base through a lifting assembly, the inner wall of the top of the base is rotatably connected to a turntable, the top of the turntable is provided with a clamping assembly for fixing the electret microphone, two symmetrically arranged vacuum tubes are fixed to the top of the base by bolts, the inner walls of the two vacuum tubes are respectively fixedly connected to a sound generator and a sound receiver, the bottom of the clamping assembly is fixedly connected to a rotating shaft, the other end of the rotating shaft is fixedly connected to a first motor through a coupling, and the first motor is fixed to the inner wall of the base by bolts.

[0008] Preferably, the lifting assembly includes a screw rod and a fixed rod, the screw rod is rotatably connected to the base and the opposite side of the bracket, and the fixed rod is fixedly connected to the base and the opposite side of the bracket.

[0009] Preferably, a second motor is fixed to the outer wall of the base via bolts, and an output shaft of the second motor is fixedly connected to one end of the screw rod via a coupling.

[0010] Preferably, a shield is provided on the top of the base, and sound insulation cotton is fixedly bonded to the inner wall of the shield.

[0011] Preferably, the blocking cover is engaged with the screw rod through threads, and the blocking cover is slidably engaged with the outer wall of the fixing rod.

[0012] Preferably, the clamping assembly includes a box body and a bidirectional threaded rod, the box body is fixedly connected to the top of the turntable, the bidirectional threaded rod is rotatably connected to the inner wall of the box body, and one end of the bidirectional threaded rod passes through the box body and is fixedly connected to a knob.

[0013] Preferably, the outer wall of the bidirectional threaded rod is threadedly connected to two symmetrically arranged connecting blocks, and the top of the connecting block is fixedly connected to an arc-shaped clamping plate through a guide rod.

[0014] Preferably, the guide rod is in sliding and limiting cooperation with the inner wall of the box body.

[0015] The utility model has at least the following beneficial effects:

[0016] By setting up a turntable, a rotating shaft and a first motor, the direction of the electret microphone can be changed through the transmission cooperation of the three, so that the electret test accuracy is higher and the test precision is improved. In addition, the setting of the vacuum tube can generate a stronger output signal, ensuring that the accuracy of the test results will not be affected by attenuation of the sound wave during the transmission process.

[0017] By setting up sound insulation cotton and a shield, external noise interference can be reduced and the accuracy of the test can be further improved. By setting up two symmetrically arranged arc-shaped clamping plates, the distance between the two arc-shaped clamping plates can be adjusted under the transmission cooperation of the bidirectional threaded rod and the connecting block. On the one hand, the accuracy of the position of the electret actuator can be ensured, and on the other hand, electret microphones of different diameters can be fixed, thereby improving the flexibility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is a three-dimensional structural diagram of the overall structure of a device for testing the directivity of an electret microphone in the present utility model;

[0020] Figure 2 This is a structural diagram of the connection between a base and a vacuum tube for directivity of an electret microphone in the present utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the overall structure of the present utility model;

[0022] Figure 4 The present invention is a cross-sectional structural diagram of a clamping assembly of a device for testing the directivity of an electret microphone.

[0023] In the figure, 1. base; 2. lifting assembly; 3. bracket; 4. turntable; 5. clamping assembly; 6. vacuum tube; 7. sound generator; 8. rotating shaft; 9. first motor; 10. sound receiver; 11. second motor; 12. sound insulation cotton; 13. baffle; 14. screw rod; 15. fixing rod; 16. box body; 17. two-way threaded rod; 18. connecting block; 19. knob; 20. guide rod; 21. arc clamping plate. DETAILED DESCRIPTION

[0024] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0025] like Figures 1-4 As shown, a device for testing the directivity of an electret microphone includes a base 1 and a bracket 3 connected to the top of the base 1 through a lifting assembly 2.

[0026] The inner wall of the top of the base 1 is rotatably connected to a turntable 4, and a clamping assembly 5 for fixing the electret microphone is provided on the top of the turntable 4. Two symmetrically arranged vacuum tubes 6 are fixed to the top of the base 1 by bolts. The inner walls of the two vacuum tubes 6 are respectively fixedly connected to a sound generator 7 and a sound receiver 10. The bottom of the clamping assembly 5 is fixedly connected to a rotating shaft 8, and the other end of the rotating shaft 8 is fixedly connected to a first motor 9 through a coupling. The first motor 9 is fixed to the inner wall of the base 1 by bolts. The electret microphone is fixed to the clamping assembly 5, and the sound generator 7 is started to output sound waves. The sound waves are received by the sound receiver 10 after passing through the electret microphone and recorded. The volume of the front position is adjusted, the first motor 9 is started to drive the rotating shaft 8 to drive the turntable 4 and the clamping assembly 5 to rotate, and the direction of the electret microphone is changed. The above steps are repeated to test the sensitivity of sound waves in different directions. The directional characteristics of the electret microphone are compared and analyzed according to the test results. By setting the turntable 4, the rotating shaft 8 and the first motor 9, the direction of the electret microphone can be changed under the transmission cooperation of the three. Compared with manual operation, the accuracy is higher, the accuracy of the test is improved, and the setting of the vacuum tube 6 can generate a stronger output signal, ensuring that the accuracy of the test results is not affected by attenuation of the sound wave during the transmission process.

[0027] Further, such as Figure 1-Figure 3 As shown, a baffle 13 is provided on the top of the base 1, and sound insulation cotton 12 is fixedly bonded to the inner wall of the baffle 13. The provision of the sound insulation cotton 12 and the baffle 13 can reduce external noise interference and further improve the accuracy of the test. The lifting assembly 2 includes a screw rod 14 and a fixed rod 15. The screw rod 14 is rotatably connected to the opposite side of the base 1 and the bracket 3, and the fixed rod 15 is fixedly connected to the opposite side of the base 1 and the bracket 3. The outer wall of the base 1 is fixed with a second motor 11 by bolts, and the output shaft of the second motor 11 is fixedly connected to one end of the screw rod 14 through a coupling. The baffle 13 and the screw rod 14 are threadedly matched, and the baffle 13 is slidably matched with the outer wall of the fixed rod 15. The second motor 11 is started to drive the screw rod 14 to rotate, and under the limit cooperation of the fixed rod 15, the baffle 13 and the sound insulation cotton 12 are driven to rise and fall.

[0028] Furthermore, Figure 2-Figure 4 As shown, the clamping assembly 5 includes a box body 16 and a bidirectional threaded rod 17. The box body 16 is fixedly connected to the top of the turntable 4. The bidirectional threaded rod 17 is rotatably connected to the inner wall of the box body 16, and one end of the bidirectional threaded rod 17 passes through the box body 16 and is fixedly connected to a knob 19. The outer wall of the bidirectional threaded rod 17 is threadedly connected to two symmetrically arranged connecting blocks 18. The top of the connecting block 18 is fixedly connected to an arc-shaped clamping plate 21 through a guide rod 20, and the guide rod 20 is slidably limited with the inner wall of the box body 16.

[0029] By rotating the knob 19, the characteristics of the bidirectional threaded rod 17 can be used to drive the two connecting blocks 18 to move relative to or away from each other, thereby adjusting the distance between the two arc-shaped clamping plates 21. When the distance between the two arc-shaped clamping plates 21 gradually becomes smaller, the electret microphone is placed between the two arc-shaped clamping plates 21, and the knob 19 is continued to be rotated until both arc-shaped clamping plates 21 are in contact with the edges of the electret microphone and maintain a certain pressure, thereby fixing the electret microphone.

[0030] In this embodiment, if Figures 1-4 As shown, the principle of the device for testing the directivity of an electret microphone provided in this embodiment is as follows:

[0031] When using the device, first rotate the knob 19, and use the characteristics of the bidirectional threaded rod 17 to drive the two connecting blocks 18 to move relative to or away from each other, and adjust the distance between the two arc-shaped clamping plates 21. When the distance between the two arc-shaped clamping plates 21 gradually becomes smaller, place the electret microphone between the two arc-shaped clamping plates 21, and continue to rotate the knob 19 until both arc-shaped clamping plates 21 are in contact with the edges of the electret microphone and maintain a certain pressure to achieve the fixation of the electret microphone. Then start the second motor 11 to drive the screw rod 14 to rotate, and at the limit of the fixing rod 15, With the cooperation, the baffle 13 and the sound insulation cotton 12 are lowered until the baffle 13 contacts the top of the base 1, which can reduce external noise interference and further improve the accuracy of the test; the sound generator 7 is started to output sound waves, and the sound waves are received by the sound receiver 10 after passing through the electret microphone, and the volume at the current position is recorded. Then the first motor 9 is started to drive the rotating shaft 8 to drive the turntable 4 and the clamping assembly 5 to rotate, and the direction of the electret microphone is changed. The above steps are repeated to test the sensitivity of sound waves in different directions, and the directional characteristics of the electret microphone are compared and analyzed according to the test results.

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0033] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0034] The above description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A device for testing the directivity of an electret microphone, comprising a base (1) and a bracket (3) connected to the top of the base (1) via a lifting assembly (2), characterized in that: The inner wall of the top of the base (1) is rotatably connected to a turntable (4), and a clamping assembly (5) for fixing an electret microphone is provided on the top of the turntable (4). Two symmetrically arranged vacuum tubes (6) are fixed to the top of the base (1) by bolts, and a sound generator (7) and a sound receiver (10) are fixedly connected to the inner walls of the two vacuum tubes (6), respectively. The bottom of the clamping assembly (5) is fixedly connected to a rotating shaft (8), and the other end of the rotating shaft (8) is fixedly connected to a first motor (9) via a coupling, and the first motor (9) is fixed to the inner wall of the base (1) by bolts.

2. The device for testing the directivity of an electret microphone according to claim 1, wherein: The lifting assembly (2) comprises a screw rod (14) and a fixing rod (15), wherein the screw rod (14) is rotatably connected to the base (1) and the opposite side of the bracket (3), and the fixing rod (15) is fixedly connected to the opposite side of the base (1) and the bracket (3).

3. The device for testing the directivity of an electret microphone according to claim 2, wherein: A second motor (11) is fixed to the outer wall of the base (1) via bolts, and an output shaft of the second motor (11) is fixedly connected to one end of the screw rod (14) via a coupling.

4. The device for testing the directivity of an electret microphone according to claim 3, wherein: A shield (13) is provided on the top of the base (1), and sound insulation cotton (12) is fixedly bonded to the inner wall of the shield (13).

5. The device for testing the directivity of an electret microphone according to claim 4, wherein: The blocking cover (13) is engaged with the screw rod (14) through threads, and the blocking cover (13) is slidably engaged with the outer wall of the fixing rod (15).

6. The device for testing the directivity of an electret microphone according to claim 1, wherein: The clamping assembly (5) comprises a box body (16) and a bidirectional threaded rod (17). The box body (16) is fixedly connected to the top of the turntable (4). The bidirectional threaded rod (17) is rotatably connected to the inner wall of the box body (16). One end of the bidirectional threaded rod (17) passes through the box body (16) and is fixedly connected to a knob (19).

7. The device for testing the directivity of an electret microphone according to claim 6, characterized in that: The outer wall of the bidirectional threaded rod (17) is threadedly connected to two symmetrically arranged connecting blocks (18), and the top of the connecting block (18) is fixedly connected to an arc-shaped clamping plate (21) via a guide rod (20).

8. The device for testing the directivity of an electret microphone according to claim 7, wherein: The guide rod (20) is in sliding and limiting engagement with the inner wall of the box body (16).

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