CN213602835U - Microphone bottom noise testing device and microphone bottom noise testing system - Google Patents
Microphone bottom noise testing device and microphone bottom noise testing system Download PDFInfo
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- CN213602835U CN213602835U CN202021909176.6U CN202021909176U CN213602835U CN 213602835 U CN213602835 U CN 213602835U CN 202021909176 U CN202021909176 U CN 202021909176U CN 213602835 U CN213602835 U CN 213602835U
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Abstract
The embodiment of the utility model discloses noise test device at bottom of microphone and noise test system at bottom of microphone is applied to electron technical field, and this noise test device at bottom of microphone includes shell, vacuum intermediate layer, real empty room and test box, and the test box setting is in real empty room for place the microphone of waiting to examine noise at bottom, vacuum intermediate layer is located between shell and the real empty room, the microphone passes through the lead wire and is connected with the electroacoustic tester who is used for testing noise at bottom of the microphone, and wherein, after the microphone is placed in the test box in real empty room, vacuum intermediate layer and real empty room are bled for the vacuum, and this noise test device at bottom of microphone and noise test system at bottom of microphone test environment noise is low, and the test result is accurate, and simple structure, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a noise test device at bottom of microphone and noise test system at bottom of microphone.
Background
The background noise (referred to as background noise for short) of the microphone refers to an electric signal value output by the microphone in a working state but without any external sound source, and the background noise test needs to be performed on an absolutely quiet occasion (the environmental noise is less than 20dB), but such test conditions are only provided by a high-end anechoic chamber, and most microphone production and application enterprises do not have such test conditions, so that accurate background noise parameters of the microphone cannot be obtained.
In the prior art, some sealing materials are used for sealing sound holes of the microphone to reduce environmental noise from entering the microphone, so that the test under a high-noise environment is completed, but the effect of reducing the environmental noise in such a way is limited, and the accuracy of testing the bottom noise of the microphone is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a noise test device at bottom of microphone and noise test system at bottom of microphone aims at solving the not high problem of the unsatisfactory test accuracy that leads to of test environment noise elimination of noise at bottom of the current test microphone.
The embodiment of the utility model provides a noise test device at bottom of microphone, include: the device comprises a shell, a vacuum interlayer, a vacuum chamber and a test box; the test box is arranged in the vacuum chamber and is used for placing a microphone to be tested for noise suppression; the vacuum interlayer is positioned between the shell and the vacuum chamber; the microphone is connected with an electroacoustic tester for testing the microphone bottom noise through a lead; the vacuum interlayer and the vacuum chamber are of an initial non-vacuum structure, and after the microphone is placed in a test box in the vacuum chamber, the vacuum interlayer and the vacuum chamber are vacuumized.
Furthermore, a sound insulation and shock absorption layer is arranged between the shell and the vacuum interlayer.
Further, the buffer layer that gives sound insulation is for inhaling the sound cotton, the shell specifically is double-deck thickening high density bakelite board.
Further, the microphone noise floor test device further includes: a vacuum manufacturing apparatus; the vacuum manufacturing device is respectively communicated with the vacuum chamber and the vacuum interlayer and used for pumping air in the vacuum chamber and the vacuum interlayer to form vacuum after the microphone is placed in the test box.
Further, the vacuum manufacturing apparatus includes: the vacuum pump, the first vacuum exhaust tube and the second vacuum exhaust tube; one end of the first vacuum exhaust pipe is connected with the vacuum pump, and the other end of the first vacuum exhaust pipe is connected with the vacuum chamber; one end of the second vacuum exhaust pipe is connected with the vacuum pump, and the other end of the second vacuum exhaust pipe is connected with the vacuum interlayer.
Further, the test box also comprises a test box plug, and the test box plug is provided with a lead hole for penetrating through the lead.
The embodiment of the utility model also provides a microphone bottom noise test system, including above-mentioned microphone bottom noise testing arrangement and the electroacoustic test appearance that is used for testing the microphone bottom noise; a microphone to be tested for the bottom noise is placed in the microphone bottom noise testing device, and the microphone is connected with the electroacoustic tester through a lead.
From the foregoing the embodiment of the utility model provides a can know, this microphone noise testing arrangement has real empty room and the dual vacuum environment of vacuum intermediate layer, place the test box of the microphone of the examination noise at the bottom of awaiting measuring, place in the real empty room of inlayer, dual vacuum environment makes the test environment noise fall very low, the degree of accuracy of the test of making an uproar at the bottom has been improved, place behind the test box at the microphone that awaits measuring, vacuum intermediate layer and real empty room are bled for the vacuum, it is inaccurate to avoid influencing the test result that the structure of microphone leads to unusually because of vacuum environment's negative pressure, and this testing arrangement simple structure, it is with low costs.
Drawings
In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a microphone bottom noise testing apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a microphone noise floor test system according to an embodiment of the present invention.
Detailed Description
To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a microphone noise floor test device according to an embodiment of the present invention. The microphone bottom noise testing device can realize a testing environment equivalent to a standard anechoic chamber, and the cost is far lower than that of the standard anechoic chamber. This microphone bottom noise testing arrangement includes:
a housing 10, a vacuum interlayer 20, a vacuum chamber 30 and a test box 40;
wherein, the test box 40 is arranged in the vacuum chamber 30 and is used for placing a microphone 50 to be tested for the noise floor;
the vacuum chamber 20 is located between the housing 10 and the vacuum chamber 30, and the microphone 50 is connected to an electroacoustic tester (not shown in fig. 1) for testing the microphone noise floor through a lead 51.
The vacuum interlayer 20 and the vacuum chamber 30 are initial non-vacuum structures, that is, neither the vacuum interlayer 20 nor the vacuum chamber 30 is an originally sealed vacuum space, so that the microphone 50 is placed in the vacuum chamber 30 in a non-vacuum state, and abnormal displacement of the diaphragm caused by the vacuum state is avoided, thereby affecting the accuracy of the bottom noise test result. Further, in the test box 40 in which the microphone 50 is placed in the vacuum chamber 30, the vacuum interlayer 20 and the vacuum chamber 30 are evacuated to vacuum.
In this embodiment, microphone bottom noise testing arrangement has the dual vacuum environment of real empty room and vacuum intermediate layer, place the test box of the microphone of examination bottom noise, place in the real empty room of inlayer, dual vacuum environment makes test environment noise fall very low, the degree of accuracy of bottom noise test has been improved, place at the microphone that awaits measuring behind the test box, vacuum intermediate layer and real empty room are bled for the vacuum, avoid influencing the test result that the structure of microphone leads to unusually inaccurate because of vacuum environment's negative pressure, and this testing arrangement simple structure, it is with low costs.
Further, be the shock attenuation layer that gives sound insulation between shell 10 and the vacuum intermediate layer 20, specifically, this shock attenuation material that gives sound insulation adopts double-deck 20mm thickening high density bakelite board for the shell, and the middle sound cotton that inhales that fills is specifically the cellucotton that attracts coefficient 0.85. The enclosure 10 and the sound-insulating and shock-absorbing layer can further reduce the interference of environmental noise on the test result.
Further, the microphone noise floor testing device further comprises: a vacuum producing device 60;
the vacuum producing device 60 is respectively communicated with the vacuum chamber 30 and the vacuum interlayer 20, and is used for pumping air in the vacuum chamber 30 and the vacuum interlayer 20 to form vacuum after the microphone 50 is put in the test box 40.
Further, the specific structure of the vacuum manufacturing apparatus 60 includes:
a vacuum pump 61, a first vacuum pumping tube 62 and a second vacuum pumping tube 63;
one end of the first vacuum pumping pipe 62 is connected with the vacuum pump 61, and the other end is connected with the vacuum chamber 30;
one end of the second vacuum pumping tube 63 is connected to the vacuum pump 61, and the other end is connected to the vacuum interlayer 20.
The vacuum manufacturing device is simple in structure, easy to operate and good in effect.
Further, the test box 40 further includes a test box plug 41, and the test box plug 41 has a lead hole for passing the lead 51. Accordingly, the housing 10 is also provided with a lead hole through which the lead 51 passes.
As shown in fig. 2, an embodiment of the present invention further provides a microphone bottom noise testing system, which includes the microphone bottom noise testing apparatus 100 shown in fig. 1 and an electroacoustic tester 200 for testing the microphone bottom noise, where the electroacoustic tester is specifically an audio analyzer with a model number of AP 515;
the microphone 50 to be tested is placed in the microphone bottom noise testing device 100, the microphone 50 to be tested is connected with the electroacoustic testing instrument 200 through a lead 51, and the electroacoustic testing instrument 200 can detect the bottom noise of the microphone 50.
In this embodiment, the microphone bottom noise test system includes a microphone bottom noise test device and an electroacoustic tester, the microphone bottom noise test device has a vacuum chamber and a vacuum interlayer dual vacuum environment, a test box for placing a microphone to be tested with bottom noise is placed in the inner vacuum chamber, the dual vacuum environment reduces the noise of the test environment to a very low level, the accuracy of the bottom noise test is improved, after the microphone to be tested is placed in the test box, the vacuum interlayer and the vacuum chamber are evacuated to be vacuum, the inaccuracy of the test result caused by the structural abnormality of the microphone due to the negative pressure of the vacuum environment is avoided, and the test device has a simple structure, low cost, correspondingly, the microphone bottom noise test system has high accuracy of the test result and low test cost.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It is right above the utility model provides a noise test device at bottom of microphone and the description of noise test system at bottom of microphone, to the technical personnel in this field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and range of application, to sum up, this description content should not be understood as the restriction of the utility model discloses.
Claims (7)
1. A microphone noise floor testing device, comprising:
the device comprises a shell, a vacuum interlayer, a vacuum chamber and a test box;
the test box is arranged in the vacuum chamber and is used for placing a microphone to be tested for noise suppression;
the vacuum interlayer is positioned between the shell and the vacuum chamber;
the microphone is connected with an electroacoustic tester for testing the microphone bottom noise through a lead;
the vacuum interlayer and the vacuum chamber are of an initial non-vacuum structure, and after the microphone is placed in a test box in the vacuum chamber, the vacuum interlayer and the vacuum chamber are vacuumized.
2. The microphone noise floor test device of claim 1, wherein a sound insulation and shock absorption layer is arranged between the shell and the vacuum interlayer.
3. The microphone noise floor test device of claim 2, wherein the sound insulation and damping layer is sound absorption cotton, and the housing is a double-layer thickened high-density bakelite plate.
4. A microphone noise floor test device according to any one of claims 1 to 3, further comprising: a vacuum manufacturing apparatus;
the vacuum manufacturing device is respectively communicated with the vacuum chamber and the vacuum interlayer and used for pumping air in the vacuum chamber and the vacuum interlayer to form vacuum after the microphone is placed in the test box.
5. The microphone noise floor test device according to claim 4, wherein the vacuum manufacturing device includes:
the vacuum pump, the first vacuum exhaust tube and the second vacuum exhaust tube;
one end of the first vacuum exhaust pipe is connected with the vacuum pump, and the other end of the first vacuum exhaust pipe is connected with the vacuum chamber;
one end of the second vacuum exhaust pipe is connected with the vacuum pump, and the other end of the second vacuum exhaust pipe is connected with the vacuum interlayer.
6. The microphone noise floor test device of claim 5, wherein the test cartridge further comprises a test cartridge plug having a lead hole for passing the lead therethrough.
7. A microphone noise floor test system, comprising: the microphone noise floor test device according to any one of claims 1 to 6 and an electroacoustic tester for testing the microphone noise floor;
a microphone to be tested for the bottom noise is placed in the microphone bottom noise testing device, and the microphone is connected with the electroacoustic tester through a lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021909176.6U CN213602835U (en) | 2020-09-04 | 2020-09-04 | Microphone bottom noise testing device and microphone bottom noise testing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021909176.6U CN213602835U (en) | 2020-09-04 | 2020-09-04 | Microphone bottom noise testing device and microphone bottom noise testing system |
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| Publication Number | Publication Date |
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| CN213602835U true CN213602835U (en) | 2021-07-02 |
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| CN202021909176.6U Active CN213602835U (en) | 2020-09-04 | 2020-09-04 | Microphone bottom noise testing device and microphone bottom noise testing system |
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