A device for testing the acoustic directivity of a handheld microphone

Abstract

The present application relates to the technical field of microphone production line testing, and in particular to a device for detecting the acoustic directivity of handheld microphones. The device comprises a test stand, a rotator, and a sound source, wherein the test stand comprises a connecting plate and a gripping clamping block fixed to the connecting plate, the gripping clamping block being provided with a plurality of recessed grooves, and a handheld microphone being firmly clamped by an elastic stabilizing block; the rotator drives the test stand to rotate, so that the handheld microphone receives sound stimulation from the sound source at different angles. The present application can meet the demand for rapid batch testing of handheld microphones.

Description

Technical Field

[0001] The present application relates to the technical field of microphone production line testing, and in particular to a device for detecting the acoustic directivity of a handheld microphone. Background Art

[0002] A microphone's directivity refers to its sensitivity to sound signals from different directions. Different application scenarios require different microphone directivity. Microphones used in concerts, performances, interviews, and other settings often require testing for cardioid polar patterns. Cardioid polar patterns are most sensitive to sounds directly in front of them and almost insensitive to sounds from behind, creating a heart-shaped pickup pattern. During testing, the acoustic parameters are primarily measured when the angle between the microphone's receiving end and the sound source's emitting end is 0° and 180°.

[0003] Current microphone testing environments are mostly static laboratory environments. When testing speeds are low and the volume is limited, simple racks are used to clamp the microphones and test their acoustic and directional characteristics. However, this mounting method is extremely unstable, and the microphones can easily be thrown out when rotating the rack for testing at different angles, making it unsuitable for rapid batch testing of microphones. Summary of the Invention

[0004] In order to meet the demand for rapid batch testing of handheld microphones, the present application provides a device for testing the acoustic directivity of handheld microphones.

[0005] The present application provides a device for testing the acoustic directivity of a handheld microphone, which adopts the following technical solution:

[0006] A device for testing the acoustic directivity of a handheld microphone, comprising:

[0007] The test bracket includes a connecting plate and a handle clamping block fixed to the connecting plate. The handle clamping block is provided with a clamping slot, which includes a handle head slot section, a handle body slot section, and a handle tail slot section that are connected in sequence. An elastic stabilizing block is provided on the inner side wall of the handle tail slot section. The elastic stabilizing block is used to clamp to the end of the handheld microphone.

[0008] The rotator comprises a carrier platform and a rotation source disposed on the carrier platform, wherein one end of the connecting plate is connected to an output end of the rotation source;

[0009] The sound source is located on one side of the test bracket and is arranged toward the test bracket.

[0010] By adopting the above technical solution, the handle of the handheld microphone to be tested is clamped by the handle clamping block to firmly clamp the handheld microphone and prevent the handheld microphone from falling off during the rotation process. When the handle clamping block clamps the handle of the handheld microphone, the elastic stabilizing block in the tail groove section of the handle is connected to the end of the handheld microphone, which can effectively prevent the handheld microphone from falling off and ensure that it will not loosen or fall during the rotation process. In addition, the test bracket only clamps the handle of the handheld microphone, so that the receiving end of the handheld microphone can be effectively aligned with the sound-emitting end of the sound source, and it is not easy to block the sound field of the sound source, so as to reduce distortion during the test. When used in batch rapid testing, it can significantly improve the test speed and data consistency.

[0011] Optionally, a first recessed groove is provided on the handle clamping block, and the first recessed groove is arranged close to the handle head groove section.

[0012] By adopting the above technical solution, the first recessed groove on the grip clamping block can provide additional space for the handle head of the handheld microphone, which helps to adjust the position of the handheld microphone or remove the handheld microphone.

[0013] Optionally, a second recessed groove is provided on the handle clamping block, and the second recessed groove is arranged close to the handle body groove section.

[0014] By adopting the above technical solution, a second recessed groove is provided on the grip clamping block, located near the stem groove. This prevents deformation or damage to the stem due to excessive pressure during the clamping process of the handheld microphone, thereby improving the stability and safety of the handheld microphone. Furthermore, the presence of the second recessed groove facilitates the operator's insertion and removal of the handheld microphone into the clamping groove, enhancing ease of use.

[0015] Optionally, a third recessed groove is provided on the handle clamping block, and the third recessed groove is arranged close to the handle tail groove section.

[0016] By adopting this technical solution, the third recessed groove on the grip clamping block is positioned near the handle tail groove, making the handheld microphone more stable when clamped. This avoids the problem of insufficient friction caused by the excessive contact surface between the grip clamping block and the handheld microphone, improves the positional stability of the handheld microphone during testing, and ensures the accuracy of test results. This design also simplifies the installation and removal process of the handheld microphone, facilitating the rapid replacement of the handheld microphone under test and improving testing efficiency.

[0017] Optionally, a test box is further included, the test box including a box body and a box cover, the box body is provided with an opening, and the box cover is used to open and close the opening;

[0018] A first mounting platform and a second mounting platform are provided in the box body. The sound source is detachably connected to the first mounting platform, and the rotator is detachably connected to the second mounting platform.

[0019] By adopting the above technical solution, the design of the test box allows the entire test process to be carried out in a closed environment, effectively avoiding the interference of external environmental noise and improving the accuracy and reliability of the test results. The structural design of the box body and the box lid facilitates the operation of loading and unloading the equipment before and after the test on the one hand, and on the other hand, the box lid can also be opened, so that the handheld microphone can be tested in different environments to meet different test needs. The first mounting platform and the second mounting platform are used to fix the sound source and the rotator respectively, ensuring the stability of the position of the two during the test, thereby ensuring the consistency of the measurement data at different angles. The detachable connection between the rotator and the sound source facilitates the adjustment of the position of the rotator and the sound source according to different models or specifications of handheld microphones, enhancing the versatility and flexibility of the device.

[0020] Optionally, a first mounting assembly is provided on the first mounting platform, the first mounting platform including a first support and a first bolt, a first support is provided on both sides of the sound source, a first waist-shaped hole is formed on the first support, one end of the first bolt passes through the first mounting platform and the first waist-shaped hole and is then threadedly connected to a first nut;

[0021] A second mounting assembly is provided on the second mounting platform, and the second mounting assembly includes a second support and a second bolt. Second supports are provided on both sides of the rotator, and a second waist-shaped hole is opened on the second mounting platform. One end of the second bolt passes through the second support and the second waist-shaped hole and is threadedly connected to a second nut.

[0022] By employing this technical solution, the first and second mounting assemblies are installed on the first and second mounting platforms, respectively, allowing for flexible adjustment of the sound source and rotator's position, ensuring they maintain accurate relative positioning during testing. Furthermore, the design of the first and second waist-shaped holes allows for fine-tuning of the positions of the sound source and rotator, improving test accuracy.

[0023] Optionally, a sound-absorbing layer is provided on the inner side wall of the test box, and the side wall of the test box is made of sound insulation material.

[0024] By adopting this technical solution, the sound-absorbing layer installed on the inner wall of the test chamber can effectively absorb internal reflected sound waves, reduce acoustic interference, and improve test accuracy. At the same time, the sound insulation material used on the side walls of the test chamber can block external noise from entering the test environment, ensuring the accuracy and reliability of test results.

[0025] Optionally, a cable accommodating hole is provided on the test box.

[0026] By adopting this technical solution, the test box features cable access holes, allowing for convenient management of the various cables required during testing, eliminating the safety hazards and operational inconvenience caused by disorganized cables. Furthermore, the cable access holes improve testing efficiency, reduce interference caused by improper cable placement, and ensure accurate and reliable test results.

[0027] Optionally, a calibration component is further included, which includes an infrared transmitter and a first infrared receiver. The infrared transmitter is arranged on one of the first supports, and a connecting strip is provided at one end of the connecting plate away from the handle clamping block. The first infrared receiver is arranged on the connecting strip, and the first infrared receiver is used to receive the signal emitted by the infrared transmitter.

[0028] By adopting the above technical solution, the setting of the calibration component ensures the accuracy of the position of the handheld microphone during the test. The use of the infrared transmitter and the first infrared receiver makes it easy to determine whether the handheld microphone on the test bracket is in a facing state with the sound source in the initial state, thereby improving the reliability and accuracy of the test results. Through the setting of the calibration component, the installation position of the sound source and the rotator can be fine-tuned to correct the relative position of the sound source and the rotator. In addition, during the test, the rotation angle of the test bracket can be adjusted by the rotator according to the signal received by the infrared receiver, ensuring that when the angle between the receiving end of the handheld microphone and the sound source is 0°, the accuracy of the test angle is ensured, thereby reducing human errors.

[0029] Optionally, a second infrared receiver is further provided on the connecting bar, and the test bracket can be rotated from a first state to a second state; when the test bracket is in the first state, the first infrared receiver is used to receive the signal transmitted by the infrared transmitter;

[0030] When the test bracket is in the second state, the second infrared receiver is used to receive the signal transmitted by the infrared transmitter.

[0031] By adopting the above technical solution, a second infrared receiver is provided so that the test bracket can perform precise angle calibration in two states respectively, ensuring the accuracy of the relative position between the handheld microphone and the sound source during the test; in the first state, the first infrared receiver can effectively receive the signal to ensure the accuracy of the initial test angle; when the test bracket is rotated to the second state, the second infrared receiver takes over the signal reception task, making the entire test process continuous and stable; this design not only improves test efficiency, but also enhances the reliability and repeatability of test results, and is particularly suitable for batch rapid testing scenarios.

[0032] In summary, this application has at least one of the following beneficial effects:

[0033] The present application provides a gripping clamping block with an elastic stabilizing block, which can firmly fix the handheld microphone to prevent it from falling off during the rotation process, thereby ensuring the safety and stability of the test process;

[0034] This application uses a rotator to realize automatic rotation of a handheld microphone, and conducts multi-angle testing in conjunction with a sound source, thereby improving test efficiency and accuracy and meeting the needs of batch rapid testing;

[0035] 3. The combined design of the test bracket and the rotator of the present application simplifies the overall structure of the device, reduces the manufacturing cost, and makes the detection device more economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of a device for detecting the acoustic directivity of a handheld microphone according to Example 1 of the present application;

[0037] Figure 2 Schematic diagram of the structure of the sound source and the test bracket installation structure of Example 1 of the present application;

[0038] Figure 3 This is a structural schematic diagram of the installation structure of the sound source and the test bracket from another perspective in Example 1 of the present application;

[0039] Figure 4 This is a structural diagram of the sound source and test bracket installation structure of Example 2 of the present application;

[0040] Explanation of reference numerals: 1. Test bracket; 11. Connecting plate; 12. Handle clamping block; 121. Clamping groove; 1211. Handle head groove section; 1212. Handle body groove section; 1213. Handle tail groove section; 122. First make way groove; 123. Second make way groove; 124. Third make way groove; 13. Connecting strip; 2. Elastic stabilizing block; 3. Rotator; 31. Support platform; 32. Rotation source; 4. Sound source; 5. Test box; 51. Box body; 512. Cable receiving hole; 511. Matching slot ; 52. Box cover; 521. Matching snap ring; 53. First mounting platform; 54. Second mounting platform; 541. Second waist-shaped hole; 6. First mounting assembly; 61. First support; 611. First waist-shaped hole; 62. First bolt; 63. First nut; 7. Second mounting assembly; 71. Second support; 72. Load-bearing ridge; 73. Second bolt; 74. Second nut; 75. Reinforcement bolt; 8. Calibration assembly; 81. Infrared transmitter; 82. First infrared receiver; 83. Second infrared receiver. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0042] Example 1:

[0043] Reference Figure 1 , an embodiment of the present application provides an acoustic directivity detection device for testing a handheld microphone, comprising a test box 5, a test bracket 1, a rotator 3 and a sound source 4. The test box 5 comprises a box body 51 and a box cover 52. The box body 51 is provided with an opening, and the box cover 52 is hinged to the box body 51 by a hinge. In this embodiment, the box body 51 is specifically configured as a hollow trapezoidal column with an open end. A matching card slot 511 is provided on the end face of the box body 51 at the opening. The opening provided on the box body 51 can facilitate the tester to put in and take out the handheld microphone, and is also convenient for maintaining the internal equipment. A matching snap ring 521 is integrally formed on the end face of the box cover 52; when the box cover 52 is rotated to close the opening of the box body 51, the matching snap ring 521 can be snapped into the matching card slot 511.

[0044] Reference Figure 1 A first mounting platform 53 and a second mounting platform 54 are fixed to the inner bottom wall of the test box 51 at intervals. The sound source 4 is detachably connected to the first mounting platform 53, and the rotator 3 is detachably connected to the second mounting platform 54. The test box 5 integrates the rotator 3 and the sound source 4 in a closed environment, effectively isolating them from external noise interference and improving test accuracy. Furthermore, the airtight seal of the test box 5 prevents the ingress of dust and other impurities, extending the service life of the equipment.

[0045] Reference Figure 1 A sound-absorbing layer is fixed on the inner wall of the test box 5, and the side walls of the test box 5 are made of sound insulation material. In addition, a cable receiving hole 512 is provided on the test box 5 to facilitate the connection of an external power supply and a data transmission line. In this embodiment, two cable receiving holes 512 are provided at intervals. The sound-absorbing layer can be made of porous polyurethane foam or other high-performance sound-absorbing materials, and the thickness is generally between 10-20 mm. The sound-absorbing layer can absorb reflected sound waves in the test box 5, reduce the echo effect, and improve the clarity of the test sound. The cable receiving hole 512 can be set at the bottom or side of the test box 5. In other embodiments, a waterproof and dustproof plug can be installed at the cable receiving hole 512 to prevent water vapor and dust from entering the interior of the test box 5. In addition, in other embodiments, a cable organizing buckle can be provided at the cable receiving hole 512 to facilitate the management and storage of cables.

[0046] Reference Figure 1 and Figure 2 The test stand 1 includes a connecting plate 11 and a handle clamping block 12 fixed to the connecting plate 11. The handle clamping block 12 is provided with a clamping groove 121. The clamping groove 121 includes a handle head groove section 1211, a handle body groove section 1212, and a handle tail groove section 1213 that are connected in sequence. An elastic stabilization block 2 is fixed to the inner side wall of the handle tail groove section 1213 away from the handle body groove section 1212. In this embodiment, the elastic stabilization block 2 is specifically configured as a circular protrusion; when the handle of the handheld microphone is clamped into the clamping groove 121, the elastic stabilization block 2 can be clamped to the end of the handheld microphone. In actual use, the handle head groove section 1211, the handle body groove section 1212, and the handle tail groove section 1213 can be appropriately adjusted according to different models of handheld microphones to accommodate various types of handheld microphones. The elastic stabilizing block 2 can be made of rubber or silicone material, which has good elasticity and friction, and can effectively prevent the handheld microphone from falling off during the rotation process.

[0047] Reference Figure 2 The handle clamping block 12 is provided with a first recessed groove 122, a second recessed groove 123, and a third recessed groove 124. The first recessed groove 122 is located near the handle head groove section 1211 and is in communication with the handle head groove section 1211. The second recessed groove 123 is located near the handle body groove section 1212, and a second recessed groove 123 is provided on both sides of the handle body groove section 1212. The third recessed groove 124 is located near the handle tail groove section 1213 and is located at the end of the handle tail groove section 1213 away from the handle body groove section 1212.

[0048] Reference Figure 2 and Figure 3The rotator 3 includes a support platform 31 and a rotation source 32 mounted on the support platform 31. The support platform 31 is located on the second mounting platform 54. In this embodiment, the rotation source 32 is specifically configured as a rotary cylinder. The end of the connecting plate 11 away from the handle clamping block 12 is fixedly connected to the output end of the rotation source 32 by bolts. A second mounting assembly 7 is mounted on the second mounting platform 54. The second mounting assembly 7 includes a second support 71 and a second bolt 73. The second support 71 is specifically configured as an L-shaped plate, and is located on both sides of the support platform 31. The side walls of the second support 71 near the support platform 31 are integrally formed with support ribs 72. Multiple support ribs 72 are vertically spaced, with a receiving groove formed between adjacent support ribs 72. The side ends of the bottom of the support platform 31 snap into the receiving groove. Multiple reinforcement bolts 75 are threaded through the side walls of the second support 71. One end of the reinforcement bolts 75 is threaded into the support platform 31, ensuring a stable connection between the support platform 31 and the second support 71. In actual use, the bottom of the support platform 31 can be snapped into a receiving slot of different vertical heights as needed to adjust the installation height. The second mounting platform 54 is provided with multiple second waist-shaped holes 541, and multiple second bolts 73 are also provided, with each second waist-shaped hole 541 corresponding to each second bolt 73. One end of the second bolt 73 passes through the second support 71 and then through the second waist-shaped hole 541, where it is threadedly connected to the second nut 74.

[0049] Reference Figure 2 and Figure 3 , the sound source 4 is located on one side of the test bracket 1, facing the test bracket 1. The sound source 4 can use a loudspeaker to ensure that the sound signal emitted is of high quality and stable. A first mounting assembly 6 is provided on the first mounting platform 53, including a first support 61 and a first bolt 62. First supports 61 are provided on both sides of the sound source 4, and the first support 61 is also provided in an L-shaped plate shape. The first waist-shaped hole 611 provided on the first support 61 enables the horizontal position of the sound source 4 on the first mounting platform 53 to be fine-tuned to ensure that the sound source 4 and the handle clamping block 12 can be adjusted to a facing state. One end of the first bolt 62 passes through the first mounting platform 53 and is inserted into the first waist-shaped hole 611, and is threadedly connected with a first nut 63 to achieve stable installation of the sound source 4 on the first mounting platform 53.

[0050] The operating principle of this embodiment is as follows: the handheld microphone is securely held by the gripping clamp 12, the rotating source 32 is activated, and after the angle between the sound receiving end of the handheld microphone and the sound emitting end of the sound source 4 reaches 0°, the sound source 4 is caused to release a sound signal. At this point, the handheld microphone's acoustic parameters, such as frequency response, distortion, and sensitivity, are tested. The rotating source 32 is then activated again, and after the angle between the sound receiving end of the handheld microphone and the sound emitting end of the sound source 4 reaches 180°, the handheld microphone's acoustic parameters, such as frequency response, distortion, and sensitivity, are tested again. Finally, the difference in sensitivity is calculated to determine the directivity of the handheld microphone. The test stand in this application avoids the problem of the handheld microphone falling off due to structural instability in traditional simple stands. The rotator 3 can drive the test stand 1 to rotate smoothly within a certain range, thereby testing the acoustic parameters and directivity of the handheld microphone when the angle between the sound receiving end of the handheld microphone and the sound emitting end of the sound source is 0° and 180°. The sound source 4 provides a standard sound wave signal to ensure the accuracy and reliability of the test results. The overall design is simple and low-cost, suitable for large-scale batch rapid testing.

[0051] Example 2:

[0052] Reference Figure 4 The difference between this embodiment and the first embodiment is that the present embodiment adds a calibration assembly 8, which includes an infrared transmitter 81, a first infrared receiver 82, and a second infrared receiver 83. The infrared transmitter 81 is fixed to a first support 61 via a connecting rod. A connecting bar 13 is fixed to the end of the connecting plate 11 away from the handle clamping block 12. The connecting plate 11 is configured in a strip shape and is arranged perpendicular to the connecting plate 11. The first infrared receiver 82 is fixed to one end of the connecting bar 13, and the second infrared receiver 83 is fixed to the other end of the connecting bar 13. The first infrared receiver 82 and the second infrared receiver 83 are arranged opposite each other.

[0053] Reference Figure 4 When the test stand 1 is in the first state, the angle between the sound receiving end of the handheld microphone and the sound emitting end of the sound source 4 is 0°; at this time, the first infrared receiver 82 can receive the signal emitted by the infrared transmitter 81. When the rotation source 32 is activated and the test stand 1 is rotated to the second state, the angle between the sound receiving end of the handheld microphone and the sound emitting end of the sound source 4 is 180°; at this time, the second infrared receiver 83 can receive the signal emitted by the infrared transmitter 81. The addition of the calibration component 8 enables precise angle calibration of the test stand 1 in both states, thereby improving the accuracy of the test results.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for testing the acoustic directivity of a handheld microphone, characterized in that: include: A test bracket (1) comprises a connecting plate (11) and a handle clamping block (12) fixed on the connecting plate (11), wherein the handle clamping block (12) is provided with a clamping groove (121), wherein the clamping groove (121) comprises a handle head groove section (1211), a handle body groove section (1212) and a handle tail groove section (1213) which are connected in sequence, and an elastic stabilizing block (2) is provided on the inner side wall of the handle tail groove section (1213), wherein the elastic stabilizing block (2) is used for clamping to the end of a handheld microphone; The rotator (3) comprises a carrier platform (31) and a rotation source (32) disposed on the carrier platform (31), wherein one end of the connecting plate (11) is connected to an output end of the rotation source (32); A sound source (4) is located on one side of the test bracket (1) and is arranged toward the test bracket (1); The test box (5) further comprises a test box (5), wherein the test box (5) comprises a box body (51) and a box cover (52), wherein the box body (51) is provided with an opening, and the box cover (52) is used to open and close the opening; a first mounting platform (53) and a second mounting platform (54) are provided in the box body (51), wherein the sound source (4) is detachably connected to the first mounting platform (53), and the rotator (3) is detachably connected to the second mounting platform (54); A first mounting assembly (6) is provided on the first mounting platform (53), the first mounting platform (53) includes a first support (61) and a first bolt (62), and the first support (61) is provided on both sides of the sound source (4); a first waist-shaped hole (611) is provided on the first support (61), and one end of the first bolt (62) passes through the first mounting platform (53) and the first waist-shaped hole (611) and is then threadedly connected to a first nut (63); a second mounting assembly (7) is provided on the second mounting platform (54), the second mounting assembly (7) includes a second support (71) and a second bolt (73), and second supports (71) are provided on both sides of the rotator (3); a second waist-shaped hole (541) is provided on the second mounting platform (54), and one end of the second bolt (73) passes through the second support (71) and the second waist-shaped hole (541) and is then threadedly connected to a second nut (74), and the first waist-shaped hole (611) and the second waist-shaped hole (541) are arranged in parallel; The device further comprises a calibration component (8), wherein the calibration component (8) comprises an infrared transmitter (81) and a first infrared receiver (82), wherein the infrared transmitter (81) is arranged on one of the first supports (61), a connecting strip (13) is provided at one end of the connecting plate (11) away from the handle clamping block (12), and the first infrared receiver (82) is arranged on the connecting strip (13), and the first infrared receiver (82) is used to receive the signal transmitted by the infrared transmitter (81); A second infrared receiver (83) is also provided on the connecting bar (13), and the test bracket (1) can be rotated from a first state to a second state; when the test bracket (1) is in the first state, the first infrared receiver (82) is used to receive the signal emitted by the infrared transmitter (81); when the test bracket (1) is in the second state, the second infrared receiver (83) is used to receive the signal emitted by the infrared transmitter (81).

2. The device for testing the acoustic directivity of a handheld microphone according to claim 1, characterized in that: The handle clamping block (12) is provided with a first paving groove (122), and the first paving groove (122) is arranged close to the handle head groove section (1211).

3. The device for testing the acoustic directivity of a handheld microphone according to claim 2, wherein: A second paving groove (123) is provided on the handle clamping block (12), and the second paving groove (123) is arranged close to the handle body groove section (1212).

4. The device for testing the acoustic directivity of a handheld microphone according to claim 3, characterized in that: A third paving groove (124) is provided on the handle clamping block (12), and the third paving groove (124) is arranged close to the handle tail groove section (1213).

5. The device for testing the acoustic directivity of a handheld microphone according to claim 1, characterized in that: A sound-absorbing layer is provided on the inner side wall of the test box (5), and the side wall of the test box (5) is made of sound-insulating material.

6. The device for testing the acoustic directivity of a handheld microphone according to claim 1, characterized in that: The test box (5) is provided with a cable accommodating hole (512).

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