A micro speaker test fixture for equivalent free field testing

Abstract

The present invention discloses a miniature speaker test fixture body for equivalent free field testing, including a fixture body, on which a coupling cavity and a pressure relief through hole for connecting the coupling cavity with the outside air are formed. Among them, due to its small volume, the coupling cavity, during the test, the sound waves emitted by the sound-emitting element are concentrated in the coupling cavity and collected by the sound-receiving element located in the coupling cavity, and its sound insulation effect is good, which is equivalent to an anechoic chamber in a free field. At the same time, the pressure relief through hole connects the coupling cavity with the atmosphere, so that the propagation of the sound waves is close to its propagation in the atmosphere, that is, the test environment of the test fixture is equivalent to the test environment of the free field, which is close to the actual use environment of the speaker. The speaker frequency response curve obtained by the test of the miniature speaker test fixture is basically the same as the trend of the speaker frequency response curve measured by the free field, which can be used as an effective basis for R&D personnel to judge the performance of the speaker, and the miniature speaker test fixture has a simple structure and a cost much lower than that of the free field, which is conducive to its promotion and use in small enterprises.

Description

[Technical field]

[0001] The present application relates to the field of acoustic testing, and in particular to a miniature speaker testing fixture for equivalent free-field testing. [Background technology]

[0002] When developing speakers and testing the performance of new products, there are two common testing methods: free field testing and pressure field testing. Free field testing has high accuracy, and R&D personnel can read the various performance characteristics of the speaker from the speaker frequency response curve, but its cost is high. Pressure field testing has low cost, but the speaker frequency response curve obtained by pressure field is a flat line before 1kHz, and R&D personnel cannot read the speaker performance from it, resulting in the inability to make accurate corrections to new products. [Summary of the invention]

[0003] The purpose of the present application is to provide a micro-speaker test fixture for equivalent free-field testing, which makes the propagation of sound waves close to its propagation in the atmosphere through a pressure relief hole that connects the coupling cavity with the outside air. That is, the test environment of the test fixture is equivalent to the free-field test environment, which is close to the actual use environment of the speaker.

[0004] This application is implemented through the following technical solutions:

[0005] A miniature speaker test fixture for equivalent free field testing comprises a fixture body, wherein a coupling cavity and a pressure relief through hole for connecting the coupling cavity with external air are formed on the fixture body.

[0006] In the micro speaker test fixture for equivalent free field test as described above, a sound-emitting element and a sound-receiving element are arranged in the coupling cavity, and the pressure relief through hole is located between the sound-emitting element and the sound-receiving element.

[0007] In the micro-speaker test fixture for equivalent free field test as described above, the sound-emitting element and the sound-receiving element are arranged opposite to each other on both axial sides of the coupling cavity, and the pressure relief through hole extends along the radial direction of the coupling cavity.

[0008] In the micro speaker test fixture for equivalent free field test as described above, there are multiple pressure relief holes, and the multiple pressure relief holes are distributed at intervals on the fixture body.

[0009] As described above, in the micro-speaker test fixture for equivalent free field test, the fixture body includes a sound-emitting component bracket for fixing the sound-emitting element, and the sound-emitting component bracket includes two support plates spaced apart to form the pressure relief through hole.

[0010] As described above, in the micro speaker test fixture for equivalent free field test, a connecting strip is provided between the two support plates, and the number of the connecting strips is multiple, and the multiple connecting strips are spaced around the circumference of the support plate to form a plurality of the pressure relief holes.

[0011] In the micro speaker test fixture for equivalent free field test as described above, the two support plates are connected closely to one side of the coupling cavity to form a connecting portion, and a connecting hole connecting the pressure relief through hole and the coupling cavity is formed on the connecting portion.

[0012] The micro speaker test fixture for equivalent free field test as described above further includes a sound receiving component bracket for fixing the sound receiving element, the coupling cavity is formed on the sound receiving element or the sound receiving component bracket, and an assembly through hole for inserting the coupling cavity is formed on the sound generating component bracket.

[0013] In the micro-speaker test fixture for equivalent free-field testing as described above, the coupling cavity is in a bowl shape or a straight cylinder shape.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The present invention makes the propagation of sound waves close to its propagation in the atmosphere by using a pressure relief through hole that connects the coupling cavity with the outside air, that is, the test environment of the test fixture is equivalent to the test environment of the free field, which is close to the actual use environment of the speaker. The speaker frequency response curve obtained by the micro speaker test fixture is basically the same as the speaker frequency response curve measured by the free field, which can be used as an effective basis for R&D personnel to judge the performance of the speaker. In addition, the micro speaker test fixture has a simple structure and a cost much lower than that of the free field, which is conducive to its promotion and use in small enterprises.

Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0017] Figure 1 It is a structural schematic diagram of the existing free field test;

[0018] Figure 2 A schematic diagram of the structure for applying the present application to a speaker test;

[0019] Figure 3 A comparison diagram of the frequency response curves of the speakers tested in the free field, pressure field and the equivalent free field formed by the present application;

[0020] Figure 4 A three-dimensional diagram of a micro speaker test fixture embodiment 1 for equivalent free-field testing of the present application;

[0021] Figure 5This is a front view of Example 1 of a micro speaker test fixture for equivalent free field testing of the present application;

[0022] Figure 6 A cross-sectional view of a micro speaker test fixture embodiment 1 for equivalent free-field testing of the present application;

[0023] Figure 7 It is a three-dimensional diagram of the sound-emitting component bracket in Example 1 of the present application;

[0024] Figure 8 is a cross-sectional view of the sound-emitting component bracket in Example 1 of the present application;

[0025] Fig. 9 A three-dimensional diagram of a micro speaker test fixture embodiment 2 for equivalent free-field testing of the present application;

[0026] Fig.10 A cross-sectional view of a micro speaker test fixture embodiment 2 for equivalent free-field testing of the present application;

[0027] Fig.11 A three-dimensional diagram of the sound-emitting component bracket in Example 2 of the present application;

[0028] Fig.12 is a cross-sectional view of the sound-emitting component bracket in Example 2 of the present application;

[0029] Fig.13 for Fig.12 A partial enlarged view of point A in the middle. [Specific implementation method]

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Depend on Figure 1 It can be seen that in the free field test, the speaker is fixed on a standard baffle in the anechoic chamber for testing. The sound waves emitted by the speaker propagate in the atmosphere, which is consistent with the actual use environment of the speaker. At the same time, the anechoic chamber is used to isolate external noise and improve the accuracy of sound reception. Therefore, the test effect is accurate and can accurately measure the various performances of the speaker. However, the construction cost of the anechoic chamber is high and small enterprises cannot afford it.

[0032] The present invention provides a micro speaker test fixture body for equivalent free field test. The embodiment 1 of the micro speaker test fixture body for equivalent free field test is shown in 1-5, including a fixture body 1, a coupling cavity 2 and a pressure relief through hole 3 that connects the coupling cavity 2 with the outside air are formed on the fixture body 1, and a sound-emitting element 4 and a sound-receiving element 5 are arranged in the coupling cavity 2. Specifically, the sound-emitting element 4 is a speaker, and the sound-receiving element 5 is a microphone. Among them, due to its small volume, the coupling cavity 2, during the test, the sound waves emitted by the sound-emitting element 4 are concentrated in the coupling cavity 2 and collected by the sound-receiving element 5 located in the coupling cavity 2, and the sound insulation effect is good, which is equivalent to an anechoic chamber in a free field. At the same time, the pressure relief through hole 3 connects the coupling cavity 2 with the atmosphere, so that the propagation of the sound wave is close to its propagation in the atmosphere, that is, the test environment of the test fixture is equivalent to the test environment of the free field, which is close to the actual use environment of the speaker. The frequency response curve of the speaker obtained by the test fixture is shown as curve 100 in FIG. 12 , where Fig.12 In the figure, curve 300 is the frequency response curve of the speaker measured by pressure field, and curve 200 is the frequency response curve of the speaker measured by free field. By comparison, curve 300 is a flat straight line before 1000HZ, which is obviously inconsistent with the trend of curve 200, while the trend of curve 100 is basically the same as that of curve 200. That is, the results measured by the micro speaker test fixture are close to the results measured by the free field, which can be used as an effective basis for R&D personnel to judge the performance of the speaker. In addition, the micro speaker test fixture has a simple structure and the cost is much lower than the free field, which is conducive to its promotion and use in small enterprises.

[0033] Further, as a preferred embodiment of the present invention but not limiting, the sound-emitting element 4 and the sound-receiving element 5 are arranged opposite to each other on both axial sides of the coupling cavity 2, and the pressure relief through hole 3 is located between the sound-emitting element 4 and the sound-receiving element 5 and extends along the radial direction of the coupling cavity 2. This arrangement facilitates the propagation and collection of sound.

[0034] Further, as a preferred embodiment of the present invention but not limiting, the fixture body 1 includes a sounding component bracket 6 for fixing the sounding element 4 and a sound receiving component bracket 7 for fixing the sound receiving component 5, the sound receiving component bracket 7 is formed with the coupling cavity 2 and a second assembly through hole (not shown in the figure) connected with the coupling cavity 2 for inserting the sound receiving component 5, the sounding component bracket 6 is formed with an assembly through hole 65 for inserting the coupling cavity 2 and the pressure relief through hole 3 connected with the coupling cavity 2, and the side of the assembly through hole 65 away from the sound receiving component bracket 7 is connected with the sounding element 4. This structural layout is reasonable and the sound measurement effect is good.

[0035] Further, as a preferred embodiment of the present invention but not limiting, the sounding member bracket 6 includes two support plates 61 arranged at intervals to form the pressure relief through hole 3. Figure 4 and Figure 5 It can be seen that the pressure relief through hole 3 is flat and long. This setting realizes the connection between the coupling cavity 2 and the outside air, so that the sound wave propagates similarly in the atmosphere, realizing the simulation of the free field test environment.

[0036] Further, as a preferred embodiment of the present invention but not limiting, a connecting strip 62 is provided between the two support plates 61, the connecting strip 62 extends along the radial direction of the coupling cavity 2, and the number of the connecting strips 62 is multiple, and the multiple connecting strips 62 are spaced around the circumference of the support plate 61 to form multiple pressure relief holes 3. This arrangement can improve the stability of the connection between the two support plates 61.

[0037] Further, as a preferred embodiment of the present invention but not limiting, the coupling cavity 2 is bowl-shaped.

[0038] Figure 6-10 This is a second embodiment of a micro speaker test fixture for an equivalent free field test, which differs from the first embodiment in that the two support plates 61 are connected to form a connecting portion 63 adjacent to one side of the coupling cavity 2, and a connecting hole 64 connecting the pressure relief through hole 3 and the coupling cavity 2 is formed on the connecting portion 63. This arrangement not only satisfies the connection between the coupling cavity 2 and the outside air, but also improves the sound insulation effect of the coupling cavity 2, avoids external noise from affecting the test effect, and further simulates the free field test environment.

[0039] Furthermore, the difference between the embodiment 1 and the embodiment 1 is that the coupling cavity 2 is formed on the sound receiving element 5. This arrangement is conducive to improving the sealing performance of the coupling cavity 2 and improving the accuracy of sound reception.

[0040] Furthermore, the difference from Example 1 is that the coupling cavity is in a straight cylindrical shape.

[0041] It should be understood that the terms "first", "second", etc. are used in this application to describe various information, but this information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information. In addition, the terms "center of a circle", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0042] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of this application is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of this application, or some technical deductions or replacements made based on the concept of this application should be considered as the protection scope of this application.

Claims

1. A micro speaker test fixture body for equivalent free field testing, It is characterized in that The jig body (1) comprises a coupling cavity (2) and a pressure relief hole (3) for connecting the coupling cavity (2) with the outside air. A sound-generating element (4) and a sound-receiving element (5) are provided in the coupling cavity (2), and the pressure relief through hole (3) is located between the sound-generating element (4) and the sound-receiving element (5); The sound-generating element (4) and the sound-receiving element (5) are arranged opposite to each other on two axial sides of the coupling cavity (2), and the pressure relief through hole (3) extends in the radial direction of the coupling cavity (2); The number of the pressure relief through holes (3) is multiple, and the multiple pressure relief through holes (3) are distributed at intervals on the fixture body (1); The jig body (1) comprises a sound-generating member support (6) for fixing the sound-generating element (4), and the sound-generating member support (6) comprises two support plates (61) arranged at intervals to form the pressure relief through hole (3); A connecting strip (62) is provided between the two support plates (61), and the number of the connecting strips (62) is plural. The plural connecting strips (62) are spaced apart around the circumference of the support plate (61) to form a plurality of the pressure relief through holes (3).

2. According to claim 1, a micro speaker test fixture body for equivalent free field test, It is characterized in that The two support plates (61) are connected at one side adjacent to the coupling cavity (2) to form a connecting portion (63), and a connecting hole (64) connecting the pressure relief through hole (3) and the coupling cavity (2) is formed on the connecting portion (63).

3. According to claim 1, a micro speaker test fixture body for equivalent free field test, It is characterized in that It also includes a sound receiving component bracket (7) for fixing the sound receiving element (5), the coupling cavity (2) is formed on the sound receiving element (5) or the sound receiving component bracket (7), and the sound generating component bracket (6) is formed with an assembly through hole (65) for inserting the coupling cavity (2).

4. According to claim 1, a micro speaker test fixture body for equivalent free field test, It is characterized in that The coupling cavity (2) is in a bowl shape or a straight cylinder shape.

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