Audio test fixture
By using multiple sets of adjustment components to achieve high-precision three-dimensional alignment of the speaker and microphone, the phase deviation problem caused by manual visual calibration in existing technologies is solved, thus improving the accuracy and practicality of audio testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-03
AI Technical Summary
In current audio equipment testing, the alignment of the speaker and microphone axes relies on manual visual calibration, which leads to large phase deviations during high-frequency sound wave testing and affects test accuracy.
Multiple adjustment components are used, including a test platform, a first adjustment component, and a second adjustment component. The speaker and microphone are aligned in three-dimensional space with high precision through limiting holes and a scale, ensuring that the center point is aligned.
It achieves high-precision alignment of the speaker and microphone in three-dimensional space, improving the measurement accuracy and engineering practicality of audio testing.
Smart Images
Figure CN223967977U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of audio testing technology, and specifically to an audio testing fixture. Background Technology
[0002] In the field of audio equipment testing (such as performance testing of acoustic devices like speakers and microphones), accurately controlling the spatial relationship between the sound source (speaker) and the receiver (microphone) is a key prerequisite for ensuring the accuracy of test results.
[0003] Current industry-standard testing methods typically require strict coaxial alignment between the acoustic center of the speaker and the pickup center of the microphone to eliminate sound wave propagation path errors caused by axial misalignment. However, existing alignment methods mainly rely on manual visual calibration combined with mechanical positioning devices, which has the following technical drawbacks: even when using high-precision fixtures to fix the device under test, the operator still needs to visually observe the spatial position of the speaker diaphragm center point and the microphone diaphragm center point. Due to the inherent limitations of human stereoscopic vision (especially in non-transparent structural devices), the axial alignment error in three-dimensional space is usually ±2mm or more. This will introduce significant phase deviation for high-frequency sound wave testing (e.g., >10kHz), leading to abnormal fluctuations in the frequency response curve.
[0004] Therefore, it is necessary to provide an audio test fixture that can achieve high-precision automatic alignment in order to improve the measurement accuracy and engineering practicality of audio test systems. Utility Model Content
[0005] The purpose of this invention is to provide an audio testing fixture that achieves high-precision automatic alignment.
[0006] To achieve the above objectives, this utility model proposes an audio testing fixture, comprising:
[0007] The test platform has a surface including a plurality of first limiting holes arranged in a matrix. The audio device under test is limited to the test platform through the first limiting holes and is aligned with the test device in a first direction through the first limiting holes.
[0008] The first adjustment component includes a first alignment member and a second alignment member disposed on the test platform and arranged parallel to each other in a second direction. The first alignment member and the second alignment member are respectively disposed close to the test equipment and the audio device under test. The audio device under test is aligned with the test equipment in a second direction through the first adjustment component. The second direction is perpendicular to the first direction.
[0009] The second adjustment component includes a third alignment member set on the test platform in a third direction. The test device is connected to the third alignment member. The third direction is perpendicular to both the first and second directions. The test device, through the combination of the first limiting hole, the first adjustment component, and the third adjustment component, aligns its center with the test point of the audio device under test.
[0010] In a preferred embodiment, the audio device under test is fixed to the test platform by a fixing component.
[0011] In a preferred embodiment, the fixing component includes a fixing platform, a plurality of fixing rods and fixing members. The fixing platform is mounted on the test platform by the fixing rods and is parallel to the surface of the test platform. The fixing platform includes a plurality of second limiting holes arranged in a matrix. The audio device under test is fixed to the fixing platform by the fixing members and the second limiting holes, and the test surface of the audio device under test is parallel to a plane determined by a first direction and a third direction.
[0012] In a preferred embodiment, both the first alignment member and the second alignment member are graduated rulers. By setting the number of graduations on the test device to be the same as the number of graduations on the test point of the audio device under test, the center of the test device and the test point of the audio device under test are aligned in the second direction.
[0013] In a preferred embodiment, the first adjustment component further includes a slide rail fixed to the test platform and extending along a first direction, wherein the test device is slidably disposed on the test platform via the slide rail and can move back and forth in the first direction.
[0014] In a preferred embodiment, the second adjustment component further includes a mounting member slidably connected to a third alignment member, the test device being mounted on the mounting member and moving upward along the third alignment member via the mounting member, the test device mounted on the mounting member extending along a second direction.
[0015] In a preferred embodiment, the audio device under test is a loudspeaker, the testing device is a microphone, and the test point of the audio device under test is the center of the loudspeaker.
[0016] In a preferred embodiment, the loudspeaker is a transparent electrostatic ultrasonic transducer.
[0017] In a preferred embodiment, the third alignment member is also provided with a scale for aligning the center of the test device with the test point of the audio device under test in a third direction.
[0018] In a preferred embodiment, the fixing member includes a fixing plate and at least one triangular bracket, the fixing plate being fixed to the fixing platform by the triangular bracket, and the plane of the fixing plate being parallel to a plane determined by a first direction and a third direction.
[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a novel audio testing fixture, which, through the cooperation of multiple sets of adjustment components, makes the audio device under test and the testing device aligned in the first, second and third directions, thereby achieving high-precision alignment between the center point of the testing device and the test point of the audio device under test. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of an audio testing fixture according to the present invention;
[0021] Figure 2 This is a top view of the structure of an audio testing fixture according to the present invention.
[0022] The attached figures are labeled as follows:
[0023] 1. Test platform; 11. Platform body; 111. First limiting hole; 12. Support component; 13. Slide rail; 2. First adjustment component; 21. First alignment component; 22. Second alignment component; 3. Second adjustment component; 31. Third alignment component; 32. Mounting component; 4. Audio device under test; 5. Fixing component; 51. Fixing platform; 511. Second limiting hole; 52. Fixing rod; 53. Fixing component; 531. Fixing plate; 532. Triangular bracket; 6. Test equipment. Detailed Implementation
[0024] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.
[0025] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.
[0026] Combination Figure 1 and Figure 2 As shown, the audio testing fixture disclosed in this utility model includes a test platform 1, a first adjustment component 2, and a second adjustment component 3. Through the combination of the test platform 1, the first adjustment component 2, and the second adjustment component 3, high-precision alignment between the center point of the test device 6 and the test point of the audio device 4 under test is achieved.
[0027] Specifically, in one embodiment, the test platform 1 includes a platform body 11 and a support component 12 for supporting the platform body 11, with the platform body 11 horizontally fixed to the support component 12. The surface of the platform body 11 is a horizontal plane (i.e., an Oxy plane), and a plurality of first limiting holes 111 are provided thereon, arranged in a matrix on the platform surface. Preferably, sound-absorbing cotton (not shown) may also be laid on the test platform 1 to improve the audio testing accuracy of the fixture.
[0028] The audio device under test (DUT) 4 is fixed to the test platform 1. In one specific embodiment, the DUT 4 is a loudspeaker, preferably a transparent electrostatic transducer, and the test point of the DUT 4 is the center point of the loudspeaker. Specifically, the DUT 4 is fixed to the test platform 1 at a certain height by a set of fixing components 5. Specifically, the fixing components 5 include a fixing platform 51, several fixing rods 52, and fixing members 53. The lower end of each fixing rod 52 is fixed in a first limiting hole 111, and the upper end is used to fix the fixing platform 51. The fixing platform 51 is horizontally fixed by the fixing rods 52, meaning its upper surface is parallel to the horizontal plane. The fixing platform 51 is also provided with several second limiting holes 511 arranged in a matrix. The DUT 4 is fixed to the fixing platform 51 by the fixing members 53 and the second limiting holes 511, and its test surface is parallel to the Oxz plane. Of course, in other alternative embodiments, the DUT 4 can also be directly fixed to the platform body 11 of the test platform 1 through the first limiting holes 111. The test device 6 is aligned with the audio device under test 4 in the first direction (i.e., the X direction here) through the first limiting hole 111 on the test platform 1, or through the first limiting hole 111 and the second limiting hole 511. Because the plane containing the first limiting hole 111 and the second limiting hole 511 is parallel to the Oxy plane, and these limiting holes are arranged in a matrix on this plane, as long as the audio device under test 4 and the test device 6 are fixed through the limiting holes, it can be guaranteed that the audio device under test 4 and the test device 6 are parallel in the X direction.
[0029] Furthermore, the fixing member 53 specifically includes a fixing plate 531 and at least one triangular bracket 532, wherein the fixing plate 531 is fixed to the fixing platform 51 by the triangular bracket 532, and the plane on which the fixing plate 531 is located is parallel to the plane (i.e., the Oxz plane) determined by the first direction and the third direction, thereby ensuring that the test surface of the audio device 4 under test on it is parallel to the Oxz plane.
[0030] The audio device under test (AUT) 4 is aligned with the test device 6 in the second direction (i.e., the y-direction) via the first adjustment component 2. Specifically, in one embodiment, the first adjustment component 2 includes a first alignment member 21 and a second alignment member 22 disposed on the test platform 1 and arranged parallel to each other in the second direction. Both the first alignment member 21 and the second alignment member 22 extend along the first direction and are respectively positioned close to the test device 6 and the AUT 4. In practice, both the first alignment member 21 and the second alignment member 22 can be graduated rulers. By setting the graduations of the test device 6 to the same graduations of the test point of the AUT 4, the center of the test device 6 and the test point of the AUT 4 are aligned in the second direction.
[0031] In a preferred embodiment, the testing device 6 is slidably disposed on the testing platform 1 and can move back and forth in a first direction to be adjusted according to the position of different test points in the first direction. Specifically, the testing platform 1 is also fixed with a slide rail 13 extending along the first direction, that is, the slide rail 13 is parallel to the first alignment member 21 mentioned above, and the testing device 6 is slidably disposed on the testing platform 1 via the slide rail 13.
[0032] The second adjustment component 3 includes a third alignment member 31 disposed on the test platform 1 in a third direction. The test device 6 is connected to the third alignment member 31. The third direction is perpendicular to both the first and second directions, i.e., the Z direction. In this embodiment, the lower end of the third alignment member 31 is also connected to the slide rail 13, thereby driving the third alignment member 31 to move in the second direction.
[0033] Furthermore, the second adjustment component 3 also includes a mounting component 32 that is slidably connected to the third alignment component 31. The test device 6 is mounted on the mounting component 32 and moves upward along the first alignment component 21 via the mounting component 32. The test device 6 mounted on the mounting component 32 extends along the second direction. The mounting component 32 can drive the test device 6 to move upward in the third direction to adjust its height to adapt to the height of different test points.
[0034] Preferably, the third alignment member 31 is also provided with a scale for aligning the center of the test device 6 with the test point of the audio device under test 4 in a third direction. The test device 6 is moved to the corresponding scale on the third alignment member 31 by the height of the test point. In practice, the test device 6 can be a microphone.
[0035] During alignment, the first alignment member 21 and the second alignment member 22 are fixed to the test platform 1 through the first limiting hole 111 to ensure that the audio device under test 4 and the test device 6 correspond in the X direction. Then, by adjusting the scale number on the first alignment member 21 corresponding to the test device 6 to be the same as the scale number on the second alignment member 22 corresponding to the test point of the audio device under test 4, the center of the test device 6 and the test point of the audio device under test 4 are aligned in the second direction. Then, the test device 6 is moved along the third alignment member 31 in the third direction to align the center of the test device 6 and the test point of the audio device under test 4 in the third direction. Thus, through the combined alignment of the first direction, the second direction, and the third direction, high-precision alignment between the center point of the test device 6 and the test point (such as the center point of the diaphragm) of the audio device under test 4 is achieved.
[0036] The advantage of this utility model is that it provides a novel audio testing fixture, which, through the cooperation of multiple sets of adjustment components, makes the audio device under test and the testing device aligned in the first, second and third directions, thereby achieving high-precision alignment between the center point of the testing device and the test point of the audio device under test.
[0037] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.
Claims
1. An audio testing fixture, characterized in that, The fixtures include: The test platform has a surface including a plurality of first limiting holes arranged in a matrix. The audio device under test is limited to the test platform through the first limiting holes and is aligned with the test device in a first direction through the first limiting holes. The first adjustment component includes a first alignment member and a second alignment member disposed on the test platform and arranged parallel to each other in a second direction. The first alignment member and the second alignment member are respectively disposed close to the test equipment and the audio device under test. The audio device under test is aligned with the test equipment in a second direction through the first adjustment component. The second direction is perpendicular to the first direction. The second adjustment component includes a third alignment member set on the test platform in a third direction. The test device is connected to the third alignment member. The third direction is perpendicular to both the first and second directions. The test device, through the combination of the first limiting hole, the first adjustment component, and the third adjustment component, aligns its center with the test point of the audio device under test.
2. The audio testing fixture as described in claim 1, characterized in that, The audio device under test is fixed to the test platform by a fixing component.
3. The audio testing fixture as described in claim 2, characterized in that, The fixing assembly includes a fixing platform, several fixing rods, and fixing components. The fixing platform is mounted on the test platform via the fixing rods and is parallel to the surface of the test platform. The fixing platform includes several second limiting holes arranged in a matrix. The audio device under test is fixed to the fixing platform via the fixing components and the second limiting holes, and the test surface of the audio device under test is parallel to the plane determined by the first direction and the third direction.
4. An audio testing fixture as described in claim 1, characterized in that, Both the first and second alignment components are graduated rulers. By setting the scale number of the test device to be aligned with the scale number of the test point of the audio device under test to be the same, the center of the test device and the test point of the audio device under test are aligned in the second direction.
5. An audio testing fixture as described in claim 1, characterized in that, The first adjustment component further includes a slide rail fixed to the test platform and extending along a first direction. The test device is slidably mounted on the test platform via the slide rail and can move back and forth in the first direction.
6. An audio testing fixture as described in claim 1, characterized in that, The second adjustment component further includes a mounting member slidably connected to the third alignment member, the test device being mounted on the mounting member and moving upward along the third alignment member via the mounting member, the test device mounted on the mounting member extending along the second direction.
7. An audio testing fixture as described in claim 1, characterized in that, The audio device under test is a loudspeaker, the testing device is a microphone, and the test point of the audio device under test is the center of the loudspeaker.
8. An audio testing fixture as described in claim 7, characterized in that, The loudspeaker is a transparent electrostatic ultrasonic transducer.
9. An audio testing fixture as described in claim 1, characterized in that, The third alignment member is also provided with a scale for aligning the center of the test equipment with the test point of the audio device under test in a third direction.
10. An audio testing fixture as described in claim 3, characterized in that, The fixing component includes a fixing plate and at least one triangular bracket. The fixing plate is fixed to the fixing platform by the triangular bracket, and the plane on which the fixing plate is located is parallel to the plane determined by a first direction and a third direction.