Sound loss testing device for waterproof sound transmission membrane

Abstract

The utility model discloses a sound loss testing device for a waterproof sound-transmitting membrane, which comprises a frame, sound insulation plates, an interior sound-absorbing cotton wedge, a fixing rod, a microphone sleeve, a sound source, a waterproof sound-transmitting membrane sample piece clamp and a microphone, the inner wall of the sound insulation plate is provided with an interior sound absorption cotton wedge surrounding the test cabin body, a microphone sleeve and a sound source which are opposite to each other in the normal direction are erected in the test cabin body through a plurality of fixing rods, one end, opposite to the sound source, of the microphone sleeve is provided with a waterproof sound transmission film sample piece clamp, and a microphone is installed in the microphone sleeve. Through the mode, the sound loss testing device for the waterproof sound-transmitting membrane provided by the utility model can be used for testing the sound loss acoustic performance of a waterproof sound-transmitting membrane material, and is mainly used for evaluating the acoustic performance loss of a consumer electronic product before and after the waterproof sound-transmitting membrane material is used in an audio system.

Description

Technical Field

[0001] The utility model relates to the field of acoustic performance detection equipment, in particular to a sound loss test device for a waterproof sound-permeable membrane. Background Art

[0002] With the increase in the application scenarios of consumer electronic products, at present, in the case of water or other environments for consumer electronic products, the safety and acoustic performance of the electronic products need to be effectively guaranteed; along with the development of waterproof material science at home and abroad, the application of PTFE-based and woven waterproof sound-permeable materials in consumer electronic products is becoming more and more widespread.

[0003] Materials such as waterproof sound-permeable membranes are favored by the consumer electronics industry because of their unique characteristics such as small mass, thin thickness, and good waterproof performance. However, due to the influence of the own processes of different waterproof sound-permeable membranes, their acoustic performances vary greatly; in order to better screen out those that meet the requirements of consumer electronic products, it is necessary to screen the performance of waterproof sound-permeable membranes in the early stage to determine in advance the sound loss performance of waterproof sound-permeable membranes from different suppliers. Content of the Utility Model

[0004] The main technical problem to be solved by the utility model is to provide a sound loss test device for a waterproof sound-permeable membrane, which can realize the sound loss acoustic performance test of the waterproof sound-permeable membrane material, mainly to evaluate the detection of the acoustic performance loss of consumer electronic products in the audio system before and after using the waterproof sound-permeable membrane material.

[0005] To solve the above technical problem, a technical solution adopted by the utility model is: to provide a sound loss test device for a waterproof sound-permeable membrane, including a frame, a sound insulation board, interior sound-absorbing cotton wedges, fixed rods, a microphone sleeve, a sound source, a waterproof sound-permeable membrane sample fixture, and a microphone. The frame is hermetically provided with sound insulation boards on each surface to form a test chamber. Interior sound-absorbing cotton wedges surrounding the test chamber are provided on the inner wall of the sound insulation board. A microphone sleeve and a sound source facing each other normally are erected in the test chamber through a plurality of fixed rods. A waterproof sound-permeable membrane sample fixture is provided at one end of the microphone sleeve facing the sound source, and a microphone is installed in the microphone sleeve.

[0006] In a preferred embodiment of the utility model, the waterproof sound-permeable membrane sample fixture is in interference fit with the microphone sleeve through a sealing ring.

[0007] In a preferred embodiment of the utility model, the microphone is in interference fit in the microphone sleeve through a sealing ring.

[0008] In a preferred embodiment of the present utility model, the microphone sleeve is fixed to the top end of the fixed rod through a support. A through hole is horizontally formed in the support, and the microphone sleeve is horizontally inserted into the through hole. A threaded hole communicating with the through hole is provided at the top of the support, and a setscrew for pressing the microphone sleeve is arranged in the threaded hole.

[0009] In a preferred embodiment of the present utility model, an audio cable adapter is provided at the bottom position of the test cabin body of the sound insulation board. The sound source and the microphone are respectively externally connected to an acquisition card, a signal modulation generator power amplifier integrated device, a computer, and a power supply through the audio cable adapter.

[0010] In a preferred embodiment of the present utility model, a plurality of universal wheels are provided at the bottom of the frame. The frame is composed of a plurality of profiles and square tees connected to each other. The sound insulation board is fixed to the profiles through sealant. The sound insulation board is composed of a steel plate, a damping layer, a glass fiber layer, and a perforated plate.

[0011] The beneficial effects of the present utility model are as follows: A waterproof sound-transmitting membrane sound loss testing device provided by the present utility model can realize the sound loss acoustic performance testing of waterproof sound-transmitting membrane materials, mainly for evaluating the acoustic performance loss of consumer electronic products before and after using waterproof sound-transmitting membrane materials in the audio system. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts, where:

[0013] Figure 1 is a structural diagram of a preferred embodiment of a waterproof sound-transmitting membrane sound loss testing device of the present utility model. Detailed Embodiments

[0014] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0015] As Figure 1 shown, the embodiments of the present utility model include:

[0016] A waterproof and sound-permeable film sound loss test device, comprising a frame 1, a sound insulation board 2, interior sound-absorbing cotton wedges 3, fixing rods 4, a microphone sleeve 5, a sound source 6, a waterproof and sound-permeable film sample fixture 7, and a microphone. The sound insulation board 2 is hermetically arranged on each surface of the frame 1 to form a test chamber. The inner wall of the sound insulation board 2 is provided with interior sound-absorbing cotton wedges 3 surrounding the test chamber. In the test chamber, a microphone sleeve 5 and a sound source 6 facing each other normally are mounted by several fixing rods 4. One end of the microphone sleeve 5 facing the sound source 6 is provided with a waterproof and sound-permeable film sample fixture 7, and a microphone is installed in the microphone sleeve 5.

[0017] Among them, the waterproof and sound-permeable film sample fixture 7 is in interference fit with the microphone sleeve 5 through a sealing ring.

[0018] Furthermore, the microphone is in interference fit in the microphone sleeve 5 through a sealing ring.

[0019] Furthermore, the microphone sleeve 5 is fixed at the top of the fixing rod 4 through a support 8. A through hole is horizontally opened on the support 8, and the microphone sleeve 5 is horizontally inserted into the through hole. A threaded hole penetrating the through hole is provided at the top of the support 8, and a setscrew 9 for pressing the microphone sleeve 5 is arranged in the threaded hole.

[0020] Furthermore, the sound insulation board 2 is provided with an audio cable adapter 10 at the bottom position of the test chamber. The sound source 6 and the microphone are electrically externally connected to a data acquisition card 11, a signal modulation generator power amplifier integrated device 12, a computer 13, and a power supply respectively through the audio cable adapter 10.

[0021] Furthermore, several universal wheels 14 are arranged at the bottom of the frame 1. The frame 1 is composed of several profiles and square tees 15 connected to each other. The sound insulation board 2 is fixed on the profiles through sealant. The sound insulation board 2 is composed of a steel plate, a damping layer, a glass fiber layer, and a perforated plate.

[0022] Further, the sound insulation board 2 is mainly composed of laminated structures such as steel plates, damping layers, fiberglass layers, interior sound-absorbing cotton, and perforated plates. Regarding the details of the profile frame 1, the profile and the square three-way joint form the frame 1, which fixes the sound insulation board 2 and forms a seal with the profile special rubber strip. In addition, the interior sound-absorbing cotton wedge 3 is used to construct a non-reflective internal condition and jointly form an acoustic environment that meets the test requirements with the sound insulation board 2. In addition, the sound source 6 is built-in with an optional integrated high-fidelity speaker, and the signal line is connected to an external power amplifier and power supply through the audio line adapter 10 reserved at the bottom of the sound insulation board 2. In addition, the microphone sleeve 5 is the acoustic sensor fixture, which fixes and seals the microphone through a sealing ring. In addition, the test sample fixture is fixed and sealed with the microphone sleeve 5 through a sealing ring. In addition, the fixing rod 4 is used to support the microphone fixture, the sample fixture, and the sound source 6 to ensure that the position of the sample and the distance between the sample and the sound source 6 meet the test requirements. In addition, the universal wheel 14 enables the convenient movement of the test chamber. In addition, the acquisition card 11 can be an NI / SIMENSE / boach self-developed data acquisition card 11. In addition, the computer 13 is installed with the Boach acoustic test system to support the test process of this product, which includes the Boach brand self-developed data acquisition and processing system software.

[0023] According to the requirements of the sound loss acoustic performance test of the waterproof and sound-permeable membrane, the following components form a complete test system:

[0024] 1) Quiet acoustic environment: A modular sound insulation board 2 formed by the profile frame 1 and the multi-layer composite laminated structure, combined with internal wedge-shaped sound-absorbing materials, forms a quiet acoustic environment required for the test.

[0025] 2) Sound source 6 excitation and reception device: A sound source 6, a microphone, and a material fixture are configured in the quiet acoustic environment chamber to ensure that the distances between the sound source 6, the material, and the microphone meet the standard requirements for sound loss detection.

[0026] 3) Material fixture: The core component of the waterproof and sound-permeable membrane sound loss test system, a fixture specially designed for clamping the waterproof and sound-permeable membrane. This fixture is mainly composed of a sample base - a hollow pressing cover - a hollow end cover.

[0027] 4) Sample clamping method: A hole is opened in the center of the sample base, the sample is placed flat on the sample base to ensure that it has no wrinkles, first pressed by the hollow pressing cover, the hollow pressing cover and the sample base are connected by a wedge fit, and finally the hollow end cover is connected to the base by a thread to press and fix the sample again.

[0028] 5) Microphone sleeve 5: The main bearing component of the microphone, which is fixed to the circular groove at the rear end of the sample base through an interference fit with a sealing rubber ring, and the internal microphone is also fixed through an interference fit with an internal sealing rubber ring.

[0029] 6) Data acquisition system: After the microphone collects the sound signal, it transmits the signal to the data acquisition system through the built-in connecting wire; the data acquisition system communicates with the software built into the computer;

[0030] 7) Professional supporting test algorithm: Based on the method of analyzing acoustic signals of sound loss built into the computer 13, the sound loss performance of the waterproof sound-permeable membrane is evaluated, so as to obtain an accurate curve of material acoustic parameters.

[0031] The functions that the whole set of systems can achieve include:

[0032] 1) Based on the construction of a silent acoustic environment in the system, solve the accuracy of noise signal acquisition in the low-noise environment of the waterproof sound-permeable membrane;

[0033] 2) Based on the design and construction of the fixture, solve the clamping and fixing of the waterproof sound-permeable membrane material, so as to reduce the influence of physical property changes such as material wrinkles and deformations on the test results;

[0034] 3) Develop data analysis software algorithms to solve the analysis of the sound loss performance of the waterproof sound-permeable membrane, and solve the influence of external interference signals on the test accuracy through the built-in multi-level Fourier transform method;

[0035] 4) Finally, through the matching and integration of the system, solve the test of the sound loss performance of the waterproof sound-permeable membrane.

[0036] The key technologies of this product are as follows:

[0037] 1) Silent cabin part: Build the cabin frame 1 through profiles, and insert the customized modular sound insulation board 2 (composite ply structure, with vibration damping and sound insulation performance materials built in) into the profile slots, and fix it in a wedge shape to form a regular hexahedron cabin. BNC\audio interfaces are reserved inside the cabin, and sound-absorbing wedges are laid inside the sound insulation board 2 to ensure a silent acoustic environment inside; in addition, the cabin is sealed through special profile sealing strips.

[0038] 2) Fixing of the sound source 6: Connect the sound source 6 with bolts through sheet metal parts, and connect it with the reserved screws of the sound insulation board 2 through the fixing rod 4, and fix it on one sound insulation board 2.

[0039] 3) Fixing of the microphone; The microphone is fixed in the microphone sleeve 5 through interference fit with the sealing ring. The microphone sleeve 5 is tightened against the fixing rod 4 with bolts. The fixing rod 4 is connected with the reserved screws of the sound insulation board 2 and is fixed on the same sound insulation board 2 as the sound source 6.

[0040] 4) Material fixture: The material fixture is connected with the microphone sleeve 5 through interference fit with the sealing ring, and the material faces the propagation direction of the sound source 6;

[0041] 5) Professional supporting test system and algorithm: Obtain the sound signals inside the soundproof chamber based on the data acquisition system, and test the sound loss acoustic performance of the waterproof sound-transmitting membrane through the sound loss test and analysis software configured on the computer.

[0042] Achieve unified matching from the chamber, test hardware to software algorithm, ensuring the accuracy of test results and the unity of the error range.

[0043] Through the above methods, the beneficial effects of this product include:

[0044] 1) Through the configuration of the waterproof sound-transmitting membrane test system, the performance test and calibration of the waterproof sound-transmitting membrane material in the audio system of consumer electronics products are solved;

[0045] 2) Output the sound loss test curve of the waterproof sound-transmitting membrane;

[0046] 3) At the same time, this system supports the elimination of interference through the combined effects of the structural design of the hardware chamber and software algorithm even when there are external vibrations or sound interferences, ensuring the effectiveness of test data.

[0047] In summary, the present utility model provides a sound loss test device for a waterproof sound-transmitting membrane, which can realize the sound loss acoustic performance test of the waterproof sound-transmitting membrane material, mainly for evaluating the detection of the acoustic performance loss of consumer electronics products in the audio system before and after using the waterproof sound-transmitting membrane material.

[0048] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made using the content of the specification of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A waterproof sound-permeable membrane sound loss test device, characterized in that: The test chamber comprises a frame, a sound insulation board, an interior sound-absorbing cotton wedge, a fixing rod, a microphone sleeve, a sound source, a waterproof sound-permeable membrane sample fixture, and a microphone. The frame is sealed with a sound insulation board on each surface to form a test chamber. The inner wall of the sound insulation board is provided with an interior sound-absorbing cotton wedge surrounding the test chamber. The test chamber is provided with a microphone sleeve and a sound source which are normally opposite to each other through a plurality of fixing rods. A waterproof sound-permeable membrane sample fixture is provided at one end of the microphone sleeve facing the sound source, and a microphone is installed in the microphone sleeve.

2. The waterproof sound-permeable membrane sound loss testing device according to claim 1, characterized in that: The waterproof sound-permeable membrane sample fixture is interference-fitted with the microphone sleeve through a sealing ring.

3. The waterproof sound-permeable membrane sound loss testing device according to claim 1, characterized in that: The microphone is interference-fitted in the microphone sleeve through a sealing ring.

4. The waterproof sound-permeable membrane sound loss testing device according to claim 1, characterized in that: The microphone sleeve is fixed to the top of the fixing rod through a support, the support is horizontally provided with a through hole, the microphone sleeve is horizontally inserted into the through hole, the top of the support is provided with a threaded hole passing through the through hole, and the threaded hole is provided with a top screw for crimping the microphone sleeve.

5. The waterproof sound-permeable membrane sound loss testing device according to claim 1, characterized in that: The sound insulation board is provided with an audio line adapter at the bottom of the test cabin, and the sound source and the microphone are electrically connected to an acquisition card, a signal modulation generator power amplifier integrated device, a computer, and a power supply through the audio line adapter.

6. The waterproof sound-permeable membrane sound loss testing device according to claim 1, characterized in that: A plurality of universal wheels are arranged at the bottom of the frame. The frame is formed by a plurality of profiles and square tees connected to each other. The sound insulation board is fixed on the profiles by sealant. The sound insulation board is composited by a steel plate, a damping layer, a glass fiber layer and a perforated plate.

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