Acoustic tuning material testing jig and testing device

Abstract

The invention discloses an acoustic tuning material testing jig and testing device, the jig comprises an upper cover and a base, a charging groove is arranged in the base, and a sound outlet hole is arranged in the charging groove; a sound inlet hole is formed in the upper cover and is opposite to the sound outlet hole up and down; the bottom surface of the upper cover is provided with a positioning convex ring protruding downwards and a central pressing plate, the central pressing plate and the positioning convex ring are located on the inner side and the outer side of the sound inlet hole, and the central pressing plate is connected with the main body part of the upper cover; and after the upper cover is arranged in the base, the central pressing plate and the positioning convex ring respectively press the edges of the inner and outer sides of the to-be-tested tuning material. Therefore, the tuning material is convenient to fix and can be conveniently taken out for continuous use after testing, and waste is avoided. The tuning material can be tested according to the shape in normal use, and the test result is more consistent with the acoustic performance of the tuning material in an actual product. The whole testing device is provided with the lifting mechanism for placing the artificial ear and the jig, so that the error generated when the distance is adjusted due to large weight can be reduced, and the testing precision is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic testing, and in particular to an acoustic tuning material testing jig and a testing device. Background Art

[0002] Tuning materials such as tuning nets, tuning papers, and non-woven fabrics play a role in protection and tuning in electroacoustics. Tuning materials of different thicknesses have different air permeabilities, which will directly affect the curve performance of the speaker unit. Traditionally, the performance parameter test of the air permeability or air permeability of tuning materials such as tuning paper generally adopts the fabric testing method of the textile industry. However, due to the large fabric testing area and high air pressure in the textile industry, it is not comparable with the electroacoustic industry, resulting in large test errors and low accuracy. For this reason, practitioners in the electroacoustic industry have invented some devices specifically for testing the performance parameters of tuning materials such as tuning paper, such as the method and device for testing the performance of breathable paper using electrical signals disclosed in Chinese invention patent CN109270167B. It uses electrical signals to test the performance of breathable paper, and calculates and analyzes the delay difference through a dual-pass oscilloscope to determine the air permeability of the breathable paper. The test steps are simple, the cost is low, it is less affected by external environmental factors, and the test data is accurate.

[0003] However, the device provided by this solution has the following problems. First, it lacks a method for securing the breathable paper (i.e., tuning paper). In practice, the paper is simply fixed to the receiver mounting plate by gluing or other means. This method of fixing is arbitrary and inconvenient, resulting in poor fixing of the breathable paper and prone to unevenness. Furthermore, the breathable paper must be removed and discarded after testing, resulting in material waste. Second, because the breathable paper in actual products (such as speakers) is small and not a perfect square or round shape, it is difficult to secure it. Testing cannot be performed with the same shape as the breathable paper in the actual product, resulting in discrepancies between the test results and the acoustic performance of the breathable paper in the actual product. Third, the test distance can only be adjusted by adjusting the position of the sounder. However, sounders are generally heavy, and adjusting them on a movable platform can result in relatively large errors, which can negatively impact the test results. Summary of the Invention

[0004] In response to the defects of the prior art, the present invention provides an acoustic tuning material testing fixture and testing device with a more reasonable structural design, more convenient and quick fixing of the tested tuning material, recyclable tested tuning material, and test results that are more consistent with the actual product acoustic performance.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: an acoustic tuning material testing fixture, comprising an upper cover and a base, the base is provided with a loading trough for placing the tuning material to be tested, and the loading trough is provided with a sound outlet hole that passes through the base from top to bottom; the upper cover is provided with a sound inlet hole that passes through from top to bottom, the shape of the sound inlet hole matches the shape of the tuning material to be tested, and the position of the sound inlet hole is opposite to the sound outlet hole in the base from top to bottom; a downwardly protruding positioning convex ring and a center pressure plate are provided on the bottom surface of the upper cover, the center pressure plate and the positioning convex ring are located on the inner and outer sides of the sound inlet hole, and the center pressure plate is connected to the main body of the upper cover; after the upper cover is installed into the base, the inner and outer edges of the tuning material to be tested are pressed by the center pressure plate and the positioning convex ring respectively, and the sound inlet hole and the sound outlet hole are separated by the tuning material to be tested.

[0006] Furthermore, the inner wall of the positioning protrusion forms the lower outer hole wall of the sound inlet hole, and the outer wall of the center pressure plate forms the inner hole wall of the sound inlet hole; the bottom surface of the loading trough of the base is a flat surface, and the bottom surface of the positioning protrusion is flush with the bottom surface of the center pressure plate; the inner and outer sides of the entrance of the sound inlet hole are set to be inclined surfaces, so that a flared structure is formed at the entrance of the sound inlet hole.

[0007] Furthermore, the outer wall size of the positioning protruding ring matches the size of the charging trough, so that after the positioning protruding ring is inserted into the charging trough, its outer wall is close to the trough wall of the charging trough.

[0008] Furthermore, a raised positioning block is provided in the loading trough of the base, and the positioning block extends from the trough wall of the loading trough toward the center of the loading trough; a positioning groove is provided on the bottom surface of the upper cover at a position opposite to the positioning block, and the positioning groove has a structure that is recessed toward the positioning convex ring. After the upper cover is installed into the base, the positioning block is embedded in the positioning groove to form a positioning structure for the upper cover and the base.

[0009] Furthermore, the entire sound inlet hole has an arc-shaped structure, and a connecting arm is provided in the sound inlet hole. The connecting arm connects the central pressure plate and the positioning protruding ring, and the connecting arm divides the sound inlet hole into several sections.

[0010] Furthermore, a concave assembly groove is provided on the bottom surface of the base, and the sound outlet hole passes through the assembly groove and the charging groove.

[0011] An acoustic tuning material testing device includes a support mechanism, a loudspeaker, an artificial ear, and the aforementioned jig. The loudspeaker is mounted on the support mechanism, the jig is mounted on the artificial ear, and the sound pickup hole of the artificial ear is opposite to the sound output hole of the jig. A lifting mechanism is installed on the support mechanism, and the artificial ear and the jig are mounted on the lifting mechanism and placed below the loudspeaker.

[0012] Furthermore, the supporting mechanism includes an upper plate, a bottom plate and a pillar, and the upper plate and the bottom plate are respectively fixed at the upper and lower ends of the pillar; a recessed slot seat is provided in the upper plate, and a speaker hole is provided in the slot seat; the speaker is installed in a box whose shape matches the slot seat to form a full-range speaker, and the speaker is embedded in the slot seat so that the speaker is aligned with the speaker hole.

[0013] Furthermore, the lifting mechanism includes a lifting support, an adjusting nut, a screw and a guide rod. The screw and the guide rod are respectively fixed upright between the upper plate and the bottom plate. The adjusting nut is installed on the screw. The lifting support is connected and fixed with the adjusting nut and is movably assembled with the guide rod through a linear bearing.

[0014] Furthermore, a placement seat is provided on the lifting support, and a avoidance opening is provided on the side wall of the placement seat, and the electrical connector of the artificial ear extends from the avoidance opening; an upwardly protruding docking joint is provided on the top of the artificial ear, and the docking joint is inserted into the assembly groove on the bottom surface of the jig to achieve stable assembly of the jig and the artificial ear; a plurality of supporting feet are provided on the bottom of the artificial ear, and the artificial ear is placed in the placement seat through the supporting feet.

[0015] The present invention uses a special jig consisting of an upper cover and a base to fix and place the tuning material to be tested. The tuning material does not need to be glued, which is not only convenient for fixing and operation and can maintain extremely high flatness, but also can be easily removed from the jig after the test is completed and continued to be used as normal tuning material without being scrapped or wasted. At the same time, the jig is designed with a structure that matches the tuning material used in the actual product, and the tuning material is also tested in the shape of normal use, so that the test results are more consistent with the acoustic performance of the tuning material in the actual product. The entire test device is designed with a lifting mechanism for placing the artificial ear and jig, which can reduce the error caused by the heavy weight when adjusting the distance, thereby maintaining higher test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the fixture of the present invention in a closed state;

[0017] Figure 2 This is a structural diagram of the jig of the present invention in an exploded state;

[0018] Figure 3 This is a structural diagram of the disassembled state of the fixture of the present invention from another angle;

[0019] Figure 4 This is a structural diagram of the jig base of the present invention after the tuning material is loaded;

[0020] Figure 5 This is the overall structural diagram of the testing device of the present invention;

[0021] Figure 6 This is an overall structural diagram of the testing device of the present invention from another angle;

[0022] Figure 7 This is a structural diagram of the test device of the present invention after the speaker is removed;

[0023] Figure 8 This is a structural diagram of the coordination state of the fixture of the present invention and the artificial ear;

[0024] Figure 9 This is a structural diagram of the jig of the present invention and the artificial ear in cooperation with each other at another angle;

[0025] Figure 10 The following are the test frequency response curves of seven different tuning paper materials.

[0026] In the figure, 1 is a fixture, 11 is an upper cover, 111 is a sound inlet hole, 112 is a positioning convex ring, 113 is a connecting arm, 114 is a slope, 115 is a positioning groove, 116 is a center pressure plate, 12 is a base, 121 is a loading trough, 122 is a sound outlet, 123 is a positioning block, 124 is an assembly groove, 2 is an artificial ear, 21 is a docking joint, 22 is an electrical connector, 23 is a support leg, 3 is a loudspeaker, 4 is a placement seat, 41 is a avoidance opening, 51 is an upper plate, 52 is a bottom plate, 53 is a pillar, 54 is a slot seat, 55 is a speaker hole, 61 is a lifting support, 62 is an adjusting nut, 63 is a screw, 64 is a guide rod, and 7 is a tuning material to be tested. DETAILED DESCRIPTION

[0027] In this embodiment, refer to Figures 1-4 The invention relates to an acoustic tuning material test fixture, comprising an upper cover 11 and a base 12. The base 12 is provided with a loading trough 121 for placing the tuning material 7 to be tested, and the loading trough 121 is provided with a sound outlet 122 that passes through the base 12 from top to bottom. The upper cover 11 is provided with a sound inlet 111 that passes through from top to bottom. The shape of the sound inlet 111 matches the shape of the tuning material 7 to be tested, such as an arc shape, a U shape, a semicircle, etc. The position of the sound inlet 11 is opposite to the sound outlet 122 in the base 12 from top to bottom, and the sound outlet 122 includes a plurality of small round holes. , arranged in the same shape as the sound inlet 111, and the length of the arrangement is also substantially the same as the length of the sound inlet 111; a downwardly protruding positioning protrusion 112 and a center pressure plate 116 are provided on the bottom surface of the upper cover 11. The center pressure plate 116 and positioning protrusion 112 are located on the inner and outer sides of the sound inlet 111, and the center pressure plate 116 is connected to the main body of the upper cover 11; after the upper cover 11 is installed in the base 12, the center pressure plate 116 and positioning protrusion 112 respectively press the inner and outer edges of the tested tuning material 7, ensuring that the tested tuning material 7 is spread flat. The tested tuning material 7 separates the sound inlet 11 from the sound outlet 122. The sound of the speaker enters the sound inlet 11, passes through the tested tuning material 7, and then is transmitted through the sound outlet 122 to be received by the artificial ear.

[0028] The inner side wall of the positioning protrusion 112 forms the lower outer hole wall of the sound inlet hole 111, and the outer side wall of the center pressure plate 116 forms the inner hole wall of the sound inlet hole 111; the bottom surface of the loading groove 121 of the base 12 is a flat surface, and the bottom surface of the positioning protrusion 112 and the bottom surface of the center pressure plate 116 are flush with each other, so that the upper cover 11 can pass through the positioning protrusion 112 and the center pressure plate 116 after being pressed on the base 12; the inner and outer sides of the entrance of the sound inlet hole 111 are set with inclined surfaces 114 to form a flared structure at the entrance of the sound inlet hole 11, so that the sound emitted by the speaker can be more fully received.

[0029] The outer wall size of the positioning protrusion 112 matches the size of the charging groove 121, so that after the positioning protrusion 112 is inserted into the charging groove 121, its outer wall is close to the groove wall of the charging groove 121, which can improve the stability of the upper cover 11 and the base 12 after being combined.

[0030] A raised positioning block 123 is provided in the loading trough 121 of the base 12, and the positioning block 123 extends from the trough wall of the loading trough 121 toward the center of the loading trough 121; a positioning groove 115 is provided on the bottom surface of the upper cover 11 at a position opposite to the positioning block 123, and the positioning groove 115 has a structure that is recessed toward the positioning convex ring 112. After the upper cover 11 is installed in the base 12, the positioning block 123 is embedded in the positioning groove 115 to form a positioning structure for the upper cover 11 and the base 12, so that the upper cover 11 will not rotate in the base 12.

[0031] The entire sound inlet hole 11 has an arc-shaped structure, and a connecting arm 113 is provided in the sound inlet hole 11. The connecting arm 113 connects the central pressure plate 116 and the positioning protruding ring 112 to improve the structural strength of the central pressure plate 116 and the flushness with the positioning protruding ring 112, and the connecting arm 113 divides the sound inlet hole 111 into three sections.

[0032] A concave assembly slot 124 is provided on the bottom surface of the base 12 , and the sound outlet hole 122 passes through the assembly slot 121 and the charging slot 124 .

[0033] Reference Figure 5-Figure 9 This is an acoustic tuning material testing device, comprising a support mechanism, a loudspeaker 3, an artificial ear 2 (the artificial ear 2 uses a standard microphone), and the aforementioned jig 1. The loudspeaker 3 is mounted on the support mechanism, and the jig 1 is mounted on the artificial ear 2, with the sound pickup hole of the artificial ear 2 facing the sound output hole 122 of the jig 1. A lifting mechanism is mounted on the support mechanism, and the artificial ear 2 and the jig 1 are mounted on the lifting mechanism and placed below the loudspeaker so that the distance between the artificial ear 2 and the loudspeaker 3 can be adjusted.

[0034] The support mechanism includes an upper plate 51, a bottom plate 52 and a support 53, and the upper plate 51 and the bottom plate 52 are respectively fixed to the upper and lower ends of the support 53; a recessed groove seat 54 is provided in the upper plate 51, and a speaker hole 55 is provided in the groove seat 54; the speaker is installed in a box (such as a square box or a round box) whose shape matches the groove seat 54 to form a full-range speaker 3, and the speaker 3 is embedded in the groove seat 54 so that the speaker is aligned with the speaker hole 55, and the fixture 1 is just below the speaker hole 55.

[0035] The lifting mechanism includes a lifting support 61, an adjustment nut 62, a screw 63, and a guide rod 64. The screw 63 and guide rod 64 are respectively fixed upright between the upper plate 51 and the bottom plate 52. The adjustment nut 62 is mounted on the screw 63. The lifting support 61 and the adjustment nut 62 are fixedly connected and movably assembled with the guide rod 64 via linear bearings. To adjust the distance between the jig 1 (or artificial ear 2) and the speaker 3, the lifting support 61 is raised or lowered by rotating the adjustment nut 62 forward or backward.

[0036] A placement seat 4 is provided on the lifting support 61, and a clearance opening 41 is provided on the side wall of the placement seat 4. The electrical connector 22 of the artificial ear 2 extends from the clearance opening 41 and is used to connect wires to the power supply and test equipment; an upwardly protruding docking joint 21 is provided on the top of the artificial ear 2, and the docking joint 21 is inserted into the assembly groove 124 on the bottom surface of the jig 1. In this way, the jig 1 and the artificial ear 2 can be assembled more stably, and the airtightness can be better ensured, so that sound can only be transmitted to the artificial ear 2 through the sound outlet 122; a number of supporting legs 23 are provided at the bottom of the artificial ear 2, and the artificial ear 2 is placed in the placement seat 4 through the supporting legs 23.

[0037] During testing, select a jig 1 that matches the tuning material 7 being tested. Place the tuning material 7 into the loading slot 121 of the base 12, covering all the sound holes 122 and leveling the surface. Then, replace the top cover 11, using the positioning collar 112 and center pressure plate 116 to press down on the tuning material 7. Place the jig 1 entirely on the artificial ear 2, inserting the docking connector 21 into the assembly slot 124. The artificial ear 2, along with the jig 1, is then placed in the placement seat 4. Install the speaker 3 into the slot 54 of the upper plate 52. Connect the speaker 3 (a 32mm miniature speaker) and the artificial ear 2 to the power supply and test equipment via wires, and subsequent testing can begin. The entire device is tested in an open space to avoid applying additional pressure to the tuning material 7 being tested.

[0038] This embodiment uses seven kinds of tuning materials (Y1 tuning paper - Y7 tuning paper) to test them separately, and the air permeability of each can be distinguished. The test results are as follows: Figure 10The frequency response curve measured by tuning paper Y1 Limit (2K-4K + / -1.5dB) is shown in Y1, the frequency response curve measured by tuning paper Y2 Limit (2K-4K + / -1.5dB) is shown in Y2, the frequency response curve measured by tuning paper Y3 Limit (2K-4K + / -1.5dB) is shown in Y3, the frequency response curve measured by tuning paper Y4 Limit (2K-4K + / -1.5dB) is shown in Y4, the frequency response curve measured by tuning paper Y5 Limit (2K-4K + / -1.5dB) is shown in Y5, the frequency response curve measured by tuning paper Y6 Limit (2K-4K + / -1.5dB) is shown in Y6, and the frequency response curve measured by tuning paper Y7 Limit (2K-4K + / -1.5dB) is shown in Y7. Comparing the frequency response curves reveals that when the Y5 and Y6 tuning papers were tested with a + / -1.5dB upper and lower limit, their frequency response curves were very similar, both passing this requirement. Even after tightening the evaluation to + / -1dB, some discernible differences were observed. Overall, the Y1 tuning paper had the highest sensitivity, with Y2-Y7 gradually decreasing, and Y7 having the lowest sensitivity.

[0039] In addition, when testing tuning materials, the tuning material is the only variable in all test processes, and other variables such as the fixture, test equipment, speakers and standard microphones are the same, which can completely eliminate the influence of other variables on the test results. Figure 10 This can also be seen from the frequency response curve shown. Each tuning paper Y1-Y7 has been tested multiple times, and the frequency response curve obtained in each test is basically the same, with very small deviations that can be ignored.

[0040] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. An acoustic tuning material test fixture, characterized by: The utility model comprises an upper cover and a base, wherein the base is provided with a loading trough for placing the tuning material to be tested, and the loading trough is provided with a sound outlet hole which passes through the base from top to bottom; the upper cover is provided with a sound inlet hole which passes through from top to bottom, the shape of the sound inlet hole matches the shape of the tuning material to be tested, and the position of the sound inlet hole is opposite to the sound outlet hole in the base from top to bottom; a downwardly protruding positioning convex ring and a central pressure plate are provided on the bottom surface of the upper cover, the central pressure plate and the positioning convex ring are located on the inner and outer sides of the sound inlet hole, and the central pressure plate is connected to the main part of the upper cover; after the upper cover is installed into the base, the inner and outer edges of the tuning material to be tested are respectively pressed by the central pressure plate and the positioning convex ring, and the sound inlet hole is separated from the sound outlet hole by the tuning material to be tested.

2. The acoustic tuning material testing jig according to claim 1, characterized in that: The inner side wall of the positioning protrusion forms the lower outer hole wall of the sound inlet hole, and the outer side wall of the center pressure plate forms the inner hole wall of the sound inlet hole; the bottom surface of the loading trough of the base is a flat surface, and the bottom surface of the positioning protrusion is flush with the bottom surface of the center pressure plate; the inner and outer sides of the entrance of the sound inlet hole are set to be inclined surfaces, so that the entrance of the sound inlet hole forms a flared structure.

3. The acoustic tuning material testing jig according to claim 1 or 2, characterized in that: The outer side wall size of the positioning protruding ring matches the size of the charging trough, so that after the positioning protruding ring is inserted into the charging trough, its outer side wall is close to the trough wall of the charging trough.

4. The acoustic tuning material testing jig according to claim 1, characterized in that: A raised positioning block is provided in the loading trough of the base, and the positioning block extends from the trough wall of the loading trough toward the center of the loading trough; a positioning groove is provided on the bottom surface of the upper cover at a position opposite to the positioning block, and the positioning groove has a structure that is recessed toward the positioning convex ring. After the upper cover is installed into the base, the positioning block is embedded in the positioning groove to form a positioning structure for the upper cover and the base.

5. The acoustic tuning material testing jig according to claim 1 or 2, characterized in that: The entire sound inlet hole is an arc-shaped structure. A connecting arm is provided in the sound inlet hole. The connecting arm connects the central pressure plate and the positioning convex ring, and the connecting arm divides the sound inlet hole into several sections.

6. The acoustic tuning material testing jig according to claim 1, characterized in that: An inwardly concave assembly groove is provided on the bottom surface of the base, and the sound outlet hole passes through the assembly groove and the charging groove.

7. An acoustic tuning material testing device comprising a support mechanism, a speaker, and an artificial ear, wherein the speaker is mounted on the support mechanism, and characterized in that: It also includes the jig according to any one of claims 1 to 6, the jig is mounted on the artificial ear, and the sound pickup hole of the artificial ear is opposite to the sound output hole of the jig; a lifting mechanism is installed on the supporting mechanism, and the artificial ear and the jig are mounted on the lifting mechanism together and placed below the speaker.

8. The acoustic tuning material testing device according to claim 7, characterized in that: The supporting mechanism includes an upper plate, a bottom plate and a pillar, and the upper plate and the bottom plate are respectively fixed to the upper and lower ends of the pillar; a recessed slot seat is provided in the upper plate, and a speaker hole is provided in the slot seat; the speaker is installed in a box whose shape matches the slot seat to form a full-range speaker, and the speaker is embedded in the slot seat so that the speaker is aligned with the speaker hole.

9. The acoustic tuning material testing device according to claim 8, characterized in that: The lifting mechanism includes a lifting support, an adjusting nut, a screw and a guide rod. The screw and the guide rod are respectively fixed upright between the upper plate and the bottom plate. The adjusting nut is installed on the screw. The lifting support is connected and fixed with the adjusting nut and is movably assembled with the guide rod through a linear bearing.

10. The acoustic tuning material testing device according to claim 9, characterized in that: A placement seat is provided on the lifting support, and a avoidance opening is provided on the side wall of the placement seat, through which the electrical connector of the artificial ear extends; an upwardly protruding docking joint is provided on the top of the artificial ear, which is inserted into the assembly groove on the bottom surface of the jig to achieve stable assembly of the jig and the artificial ear; a number of supporting feet are provided on the bottom of the artificial ear, and the artificial ear is placed in the placement seat through the supporting feet.

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