Device for testing bone conduction transmitter in protective earmuff
The vibration table and locking mechanism are used to stabilize the bone guide for the protective earmuff, which solves the test interference problem caused by the insufficiency of fixing in the prior art, and achieves efficient and accurate testing results.
Patent Information
- Application Number
- CN202421628642.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-10
AI Technical Summary
Existing test devices are difficult to close the bone guide in the protective earmuff, resulting in interference factors in the test and the inability to accurately capture weak signals.
A device including a vibration table, a vibration signal receiving plate, a bottom plate, a screw and a locking mechanism is adopted to fix the protective ear cup through the screw and a pressure plate to ensure stable connection and signal transmission.
It realizes stable fixation of the bone guide, avoids scratches or damage during the test, improves the accuracy and simplicity of the test, can analyze the test results from multiple angles, and has good noise resistance.
Smart Images
Figure CN223182332U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of microphone detection, in particular to a device for testing a bone conduction microphone in a protective earmuff. Background Art
[0002] The bone conduction microphone in the protective earmuff collects sound by using the slight vibration of the head bone marrow caused by human speech and converts it into an electrical signal. The electrical signal is transmitted through the protective earmuff and then converted into sound for the receiving tester to listen to. The bone conduction microphone can conduct sound clearly even in a very noisy environment.
[0003] To ensure the normal use of the bone conduction microphone in the protective earmuff, quality testing is required. However, the existing testing devices are difficult to limit and fix the bone conduction microphone in the protective earmuff in a closed manner, making it extremely easy to have interference factors affecting the test and unable to capture weak signals during the test. Summary of the Utility Model
[0004] The purpose of the utility model is to solve the problem that it is difficult to test the bone conduction microphone in the prior art. To achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A device for testing a bone conduction microphone in a protective earmuff, including a vibration table, a vibration signal receiving board is installed at the top of the vibration table, and a bottom plate for sleeving the vibration signal receiving board is arranged on the vibration table. A protective earmuff is connected to the vibration signal receiving board, and a protective earmuff cable is installed on the protective earmuff. Two screws are fixedly installed on the bottom plate, and a locking mechanism for fixing the protective earmuff is arranged on the vibration table through the two screws;
[0006] The locking mechanism includes a pressing plate sleeved on the two screws, and nuts for fixing both ends of the pressing plate are threadedly connected to the top ends of the two screws. A fastening screw for fixing the pressing plate is threadedly installed at both ends of the pressing plate.
[0007] Preferably, the bottom plate is a cover structure sleeved on the top of the vibration table, and three through holes for installing screws on the vibration table are opened in the bottom plate.
[0008] Preferably, the protective earmuff cable extends outside the protective earmuff.
[0009] Preferably, the two screws are symmetrically arranged in the middle.
[0010] Preferably, the pressing plate abuts against the protective earmuff.
[0011] Compared with the prior art, the utility model has the following advantages:
[0012] 1. The utility model is easy to clean. When used to test the bone conduction microphone in the protective earmuff, it will not cause scratches or damage to the surface of the protective earmuff, effectively protecting the integrity of the product.
[0013] 2. By analyzing the electrical signals received by the receiving device and the sound signals converted and restored respectively, the technical indicators of the bone conduction microphone are tested from two aspects and compared, avoiding the inaccuracy caused by a single test result.
[0014] 3. The utility model is used to test the bone conduction microphone in the protective earmuff. The assembly operation is very simple. Through the combined test with other tooling, the anti-noise and noise-proof performance of the protective earmuff can be tested. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 FIG. is a schematic structural diagram of a device for testing a bone conduction microphone in a protective earmuff proposed by the utility model;
[0016] Figure 2 FIG. is a device for testing a bone conduction microphone in a protective earmuff proposed by the utility model;
[0017] Figure 3 FIG. is a device for testing a bone conduction microphone in a protective earmuff proposed by the utility model;
[0018] Figure 4 FIG. is a device for testing a bone conduction microphone in a protective earmuff proposed by the utility model.
[0019] In the figure: 1. vibration table; 2. bottom plate; 3. vibration signal receiving board; 4. protective earmuff; 5. screw; 6. press plate; 7. nut; 8. fastening screw; 9. protective earmuff cable. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0021] Referring to Figures 1 - 4 , a device for testing a bone conduction microphone in a protective earmuff includes a vibration table 1. A vibration signal receiving board 3 is installed at the top of the vibration table 1, and a bottom plate 2 for sleeving the vibration signal receiving board 3 is provided on the vibration table 1. Three through holes for installing screws on the vibration table 1 are opened in the bottom plate 2. The bottom plate 2 is inserted into the vibration table 1 from above and fixed on the vibration table 1 with three screws. A protective earmuff 4 is connected to the vibration signal receiving board 3. The vibration signal receiving board 3 is assembled on the bottom plate 2 and fixed with screws. After the product assembly is completed, the vibration table 1 is connected to 220V alternating current for detection.
[0022] Moreover, a protective earmuff cable 9 is installed on the protective earmuff 4, and two screws 5 are fixedly installed on the base plate 2. The two screws 5 are assembled on the base plate 2, and the protective earmuff 4 is closely attached to the base plate 2. The pressure plate 6 is passed through the screws 5 so that the pressure plate 6 and the base plate 2 clamp the protective earmuff 4, and the protective earmuff 4 can be pressed on the base plate 2.
[0023] The vibration table 1 is provided with a locking mechanism for fixing the protective earmuff 4 through two screws 5. For details, refer to the attached Figure 2 to the attached Figure 3 , and the locking mechanism includes a pressure plate 6 sleeved on the two screws 5. The nut 7 is assembled on the screw 5 so that the protective earmuff 4 is closely attached and fixed on the base plate 2, and the pressure plate 6 is fixed from both left and right sides by using fastening screws 8. Moreover, nuts 7 for fixing both ends of the pressure plate 6 are threadedly connected to the tops of the two screws 5, and fastening screws 8 for fixing the pressure plate 6 are threadedly installed at both ends of the pressure plate 6 to further lock and limit the pressure plate 6 sleeved on the screw 5.
[0024] For details, refer to the attached Figure 4 , and the base plate 2 is a treasure cover structure sleeved on the top end of the vibration table 1 to facilitate ensuring the sleeving stability between the vibration table 1 and the base plate 2.
[0025] The protective earmuff cable 9 extends outside the protective earmuff 4, and the protective earmuff cable 9 is inserted into the corresponding socket hole of the protective earmuff 4 for converting and transmitting the signal data received inside the protective earmuff 4.
[0026] The two screws 5 are symmetrically arranged along the center line to provide a balanced and symmetric support for the pressure plate 6.
[0027] The pressure plate 6 abuts against the protective earmuff 4 to press and limit the protective earmuff 4.
[0028] It should be noted that the specific model and specification of the vibration signal receiving board 3 need to be selected according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in the field, so it will not be elaborated here.
[0029] The functional principle of the present utility model can be described through the following operation method:
[0030] First of all, the vibration table 1 vibrates slightly at a certain frequency, driving the base plate 2 to vibrate together, and the vibration signals are collected by the bone conduction microphone in the protective earmuff 4 that is closely fixed on the bone conduction tooling.
[0031] Secondly, the protective earmuff 4 converts the vibration signals into electrical signals, and the electrical signals are transmitted through the protective earmuff cable 9 connected to the protective earmuff 4 by wire, or transmitted wirelessly.
[0032] Again, a receiving device (such as a handheld radio) receives an electrical signal and then converts it back into a sound signal for the tested receiver to listen to.
[0033] Finally, by analyzing the electrical signal received by the receiving device and the converted sound signal, the technical indicators of the bone conduction microphone are tested, generally including frequency response, distortion rate, and receiving sensitivity.
[0034] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.
Claims
1. A device for testing a bone conduction microphone in an earmuff, comprising a vibration table (1), characterized in that, A vibration signal receiving board (3) is installed at the top of the vibration table (1), and a bottom plate (2) for sleeving the vibration signal receiving board (3) is provided on the vibration table (1). A protective earmuff (4) is connected to the vibration signal receiving board (3), and a protective earmuff cable (9) is installed on the protective earmuff (4). Two screw rods (5) are fixedly installed on the bottom plate (2), and a locking mechanism for fixing the protective earmuff (4) is provided on the vibration table (1) through the two screw rods (5); The locking mechanism includes a pressure plate (6) sleeved on the two screw rods (5), and nuts (7) for fixing both ends of the pressure plate (6) are threadedly connected to the tops of the two screw rods (5). Fastening screws (8) for fixing the pressure plate (6) are threadedly installed at both ends of the pressure plate (6).
2. The device for testing a bone conduction microphone in a protective earmuff according to claim 1, characterized in that, The bottom plate (2) is a corbel structure sleeved on the top of the vibration table (1), and three through holes for installing screws on the vibration table (1) are provided in the bottom plate (2).
3. The device for testing a bone conduction microphone in a protective earmuff according to claim 1, characterized in that, The protective earmuff cable (9) extends outside the protective earmuff (4).
4. The device for testing the bone conduction microphone in the protective earmuff according to claim 1, characterized in that, The two screw rods (5) are symmetrically arranged along the midline.
5. The device for testing the bone conduction microphone in the protective earmuffs according to claim 1, characterized in that, The pressure plate (6) abuts against the protective earmuff (4).