CN114363788A - Background noise test system for microphone - Google Patents
Background noise test system for microphone Download PDFInfo
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- CN114363788A CN114363788A CN202210053713.9A CN202210053713A CN114363788A CN 114363788 A CN114363788 A CN 114363788A CN 202210053713 A CN202210053713 A CN 202210053713A CN 114363788 A CN114363788 A CN 114363788A
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Abstract
The embodiment of the application discloses microphone background noise test system relates to electroacoustic technology field, and this microphone background noise test system includes: the device comprises a purification power supply, a partial pressure test module, a shielding device and a tester, wherein the purification power supply is connected with the input end of the partial pressure test module and is used for outputting a power supply voltage lower than a preset noise value to the partial pressure test module, the voltage division testing module comprises a voltage division switch, the voltage division testing module is connected with a microphone to be tested in the shielding device through the voltage division switch, for providing test voltages of different voltage values to the microphone under the control of the voltage dividing switch, the shielding device comprises a suspension device, the shielding device is suspended and hung through the suspension device, the inner cavity of the shielding device is used for placing the microphone, the tester is connected with the microphone and used for testing the background noise value of the microphone according to the output signal of the microphone, the background noise test system of the microphone thoroughly eliminates electromagnetic interference and acoustic vibration interference, and greatly improves the accuracy of test results.
Description
Technical Field
The embodiment of the application relates to the technical field of electroacoustic, in particular to a background noise testing system for a microphone.
Background
The standard index for detecting the background noise of the microphone is that the lower the output signal voltage of the microphone is, the better the microphone is in a state that the microphone does not have any sound including air disturbance input, and the standard requirement is below 30 microvolts (muv), so that the microphone is a very weak output signal.
The existing test of background noise of the microphone is generally that the power supply for supplying power to the microphone in the test is a regulated power supply with high price and large volume, and in the test device, even the background noise of the regulated power supply exceeds the requirement of less than 30 uv. Therefore, the background noise of the microphone needs to be obtained after the background noise of the stabilized voltage power supply is subtracted from the test result, so that the test result of the background noise of the microphone is not convenient, fast and visual to obtain, and the test result of the background noise of the microphone is not accurate due to the fact that the background noise of the stabilized voltage power supply has errors in measurement.
Disclosure of Invention
The embodiment of the application provides a microphone background noise test system, which can solve the problems that when the microphone background noise is tested, the requirement on the test environment is high, and the test result is not visually, conveniently and accurately obtained.
An embodiment of the present application provides a microphone background noise test system in one aspect, including:
the device comprises a purification power supply, a partial pressure test module, a shielding device and a tester;
the purification power supply is connected with the input end of the partial pressure test module and is used for outputting a power supply voltage lower than a preset noise value to the partial pressure test module;
the partial voltage testing module comprises a partial voltage switch, is connected with a microphone to be tested in the shielding device through the partial voltage switch and is used for providing different testing voltages for the microphone under the control of the partial voltage switch;
the shielding device comprises a suspension device, the shielding device is suspended and hung through the suspension device, and an inner cavity of the shielding device is used for placing the microphone;
the tester is connected with the microphone and used for testing the background noise value of the microphone according to the output signal of the microphone.
According to the embodiments of the application, the background noise testing system of the microphone comprises the shielding device for placing the microphone to be tested with the background noise, the shielding device can shield the noise in the surrounding space and is suspended through the suspension device, vibration interference in the environment is reduced, the background noise of the microphone can be tested without a anechoic room environment, the background noise testing system of the microphone adopts a purification power supply capable of outputting power supply voltage without internal noise, circuit noise generated during background noise testing of the microphone is reduced, testing accuracy of the testing instrument for testing the background noise of the microphone is improved, and the testing instrument directly outputs the tested background noise value, so that the testing is convenient and visual.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a microphone noise floor test system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a microphone noise floor test system according to another embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a microphone noise floor test system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a shielding device in a microphone noise floor test system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a microphone background noise testing system which is used for testing the background noise of a microphone. Referring to fig. 1, the microphone noise floor test system includes:
the device comprises a purification power supply 10, a partial pressure test module 20, a shielding device 30 and a tester 40;
the purifying power supply 10 is connected to an input end of the voltage division testing module 20, and is configured to output a power supply voltage lower than a preset noise value to the voltage division testing module 20, where the preset noise value may be greater than 10uv, and the preset noise value refers to a noise value in a common environment where environmental electromagnetic interference is not intentionally eliminated, and a device such as a switching power supply, a wireless gateway, and a mobile phone is in a working state at 0.3 meter of the purifying power supply. The clean power source 10 may be embodied as a 5v (volt) lithium battery of the type BYD-05-20000 having an internal resistance of less than 0.1 Ω (ohm).
The voltage division testing module 20 comprises a voltage division switch 21, and the voltage division testing module 20 is connected with the microphone 50 to be tested in the shielding device 30 through the voltage division switch 21, and is used for providing different testing voltages to the microphone 50 to be tested under the control of the voltage division switch 21.
The shielding device 30 comprises a suspension device 31, the shielding device 30 is suspended and hung through the suspension device 31, and an inner cavity of the shielding device 30 is used for placing the microphone 50 to be tested. The suspension means 31 particularly comprise suspension springs.
The tester 40 is connected to the microphone 50 to be tested for testing the background noise value of the microphone 50 to be tested according to the output signal of the microphone 50 to be tested.
In the embodiment of the application, the background noise test system of the microphone comprises a shielding device for placing the microphone to be tested for the background noise, the shielding device can shield the noise of the surrounding space, and the shielding device is suspended through a suspension device, the vibration interference in the environment is reduced, the background noise of the microphone can be tested without a anechoic room environment, the background noise test system of the microphone adopts a power supply purification power supply which can output no internal noise, the circuit noise generated when the background noise of the microphone is tested is reduced, the test precision of the background noise of the microphone tested by the tester is improved, and the background noise value of the test is directly output by the tester, so that the microphone is convenient and visual.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a microphone noise floor test system according to another embodiment of the present application, and the voltage division test module 20 includes: a constant current module 22 and a voltage division module 23;
one end of the constant current module 22 is connected with the purifying power supply 10, and the other end is connected with the voltage division module 23;
the constant current module 22 is configured to provide a constant current for the voltage dividing module 23, and the voltage dividing module 23 is configured to generate the test voltages with different values by switching the voltage dividing switch 21.
Further, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a microphone noise floor test system provided in the embodiment of the present application, specifically a schematic circuit diagram including a clean power supply, a voltage division test module, and a shielding device.
The voltage division module 23 comprises a plurality of diodes connected in series and an adjustable resistor R1;
in this embodiment, the number of the diodes is related to the number of the divided voltages, preferably, the test voltages required by the microphone may be 1.5v, 2v, 3v, and 4.5v, different test voltages may meet the working requirements of microphones of different models, a plurality of diodes are connected in series, a plurality of different test voltages that vary according to 0.5v voltage may be obtained, and then a stable test voltage is provided for the microphone. In fig. 3, 4 diodes, i.e., diodes D2, D3, D4, and D5 in fig. 3 are taken as an example. The diodes are all silicon diodes, the thermal noise of the silicon diodes is small, and the silicon diodes cannot generate active noise.
The anode of each diode is provided with a voltage dividing terminal, A, B, C and D four voltage dividing terminals are shown in FIG. 3, and a voltage dividing switch K generates different values of test voltage through respective connection with each voltage dividing terminal.
The adjustable resistor R1 is used to control the voltage division value of the diodes, preferably 0.5v per diode.
Further, the constant current module 22 includes a constant current diode D1, the anode of the constant current diode D1 is connected to the anode of the purifying power supply 10, and the cathode of D1 is connected to the anode of D2.
Further, the voltage dividing module 23 further includes: a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4;
the first capacitor C1 is connected to the negative electrode of the constant current diode D1 and the negative electrode of the purification power supply 10 (the lithium battery in fig. 3) for stabilizing the supply voltage output by the lithium battery through the constant current diode D1;
the second capacitor C2 and the third capacitor C3 are connected with the first capacitor C1 in parallel and are used for filtering radio frequency and other electromagnetic interference signals;
the fourth capacitor C4 is connected to the positive pole of the output terminal, and the background noise of the microphone in the shielding device is transmitted to the testing instrument through the output of the C4.
The capacitor C1-C4 is specifically a tantalum capacitor with extremely small leakage current, and because the voltage at two ends of the capacitor cannot change suddenly, the capacity of the capacitor C1 is large enough to play a role in no power consumption and voltage stabilization. The capacitors C2 and C3 function as high frequency filters, and if strong interference signals exist in the environment and enter the circuit through the wires, the capacitors C2 and C3 can filter the interference signals.
The circuit principle is as follows: direct current voltage provided by the lithium battery 5v is constant current through a constant current diode D1, and passes through a voltage division circuit consisting of diodes D2-D5 and an adjustable resistor R1, the current generates voltage values U1, U2, U3 and U4 on voltage division terminals A, B, C and D, the voltage is sequentially increased by 0.5v from U1 to U4, the voltage division switch K is respectively connected with the voltage division terminals A, B, C and D to obtain different voltage values, different working voltages can be further provided for a microphone to be tested through the R2, the microphone is enabled to be in a working state, and then the test of background noise of the microphone is completed.
Further, referring to fig. 4, fig. 4 is a schematic structural diagram of a double-layer shielding device 30 in the background noise testing system of a microphone according to the embodiment of the present application, where a housing of the shielding device 30 is made of a metal material, and the housing is grounded through a wire, and the grounded can effectively shield an external electromagnetic interference signal.
Specifically, the shielding device 30 includes an outer shielding cavity 32 and an inner shielding cavity 33;
the inner shield cavity 33 is disposed in the outer shield cavity 32.
The outer shell of the outer shielding cavity 32 is made of metal, and the outer shell of the inner shielding cavity 33 is also made of metal.
The outer shell of the outer shielding cavity 32 is grounded, so that an external electromagnetic interference signal is shielded, the electromagnetic interference signal cannot enter the tested microphone to generate noise, and the testing precision of the test is improved.
A first sound-damping layer 34 is arranged between the outer shielding chamber 32 and the inner shielding chamber 33, a second sound-damping layer 35 is arranged on the inner side of the inner shielding chamber 33, and a microphone 50 to be tested is placed in the inner shielding chamber 33.
First noise damping layer 34 and second noise damping layer 35 all specifically are inhales the sound cotton, can absorb the noise, avoid the removal collision in interior outer shielding chamber, further reduce the noise of intracavity.
The shielding device 30 further includes a lead channel 36;
the outer shield cavity 32, the inner shield cavity 33, the first sound-damping layer 34 and the second sound-damping layer 35 are provided with lead passage through-holes (not labeled in fig. 4) for receiving and providing the lead passages 36.
The microphone noise floor test system further comprises: a connecting lead 37;
a connecting lead 37 is provided in the lead passage 36, one end of the connecting lead 37 includes a connector 371, the connector 371 is used for connection with the microphone 50, and the other end 372 of the connecting lead 37 is connected with the depuration power supply 10 (not labeled in fig. 4) and the tester 50 (not labeled in fig. 4) through the relevant circuits or elements, specifically, with the lithium battery through R2, D1 shown in fig. 3, and with the tester through a capacitor C4.
The outer shield chamber 32 has a detachable outer shield chamber cover 321, the inner shield chamber 33 has a detachable inner shield chamber cover 331, and the microphone 50 can be put in or taken out by opening the outer shield chamber cover 321 and the inner shield chamber cover 331.
In the embodiment of the application, the background noise test system of the microphone comprises a shielding device for placing the microphone to be tested for the background noise, the shielding device can shield noise/electromagnetic interference of the surrounding space, the microphone is suspended through a suspension device, vibration interference in the environment is reduced, the background noise of the microphone can be tested without a anechoic room environment, the background noise test system of the microphone adopts a lithium battery as a purification power supply, circuit noise generated when the background noise of the microphone is tested is reduced, the test precision of the background noise of the microphone tested by a tester is improved, and the tester directly outputs the tested background noise value, so that the microphone is convenient and visual.
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.
The above description is provided for the background noise test system of a microphone, and for those skilled in the art, there may be variations in the specific implementation and application scope according to the concepts of the embodiments of the present invention, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. A microphone noise floor test system, comprising:
the device comprises a purification power supply, a partial pressure test module, a shielding device and a tester;
the purification power supply is connected with the input end of the partial pressure test module and is used for outputting a power supply voltage lower than a preset noise value to the partial pressure test module;
the partial voltage testing module comprises a partial voltage switch, is connected with a microphone to be tested in the shielding device through the partial voltage switch and is used for providing different testing voltages for the microphone under the control of the partial voltage switch;
the shielding device comprises a suspension device, the shielding device is suspended and hung through the suspension device, and an inner cavity of the shielding device is used for placing the microphone;
the tester is connected with the microphone and used for testing the background noise value of the microphone according to the output signal of the microphone.
2. The system of claim 1, wherein the partial pressure test module comprises: the constant current module and the voltage division module;
one end of the constant current module is connected with the purification power supply, and the other end of the constant current module is connected with the voltage division module;
the constant current module is used for providing constant current for the voltage dividing module;
the voltage division module is used for generating the test voltages with different values through the switching of the voltage division switch.
3. The system of claim 2, wherein the voltage divider module comprises: a plurality of diodes and adjustable resistors connected in series;
the anode of each diode is provided with a voltage division terminal, and the voltage division switch is respectively connected with each voltage division terminal to generate the test voltage with different values.
4. The system of claim 3, wherein the constant current module comprises a constant current diode;
and the anode of the constant current diode is connected with the purification power supply.
5. The system of claim 4, wherein the voltage divider module further comprises: the first capacitor, the second capacitor, the third capacitor and the fourth capacitor;
the first capacitor is connected with the cathode of the constant current diode and the purification power supply and is used for stabilizing the power supply voltage output by the purification power supply through the constant current diode;
the second capacitor and the third capacitor are connected with the first capacitor in parallel and used for filtering interference signals;
and the fourth capacitor is connected with the anode of the output end.
6. The system of claim 1, wherein the purified power source comprises a lithium battery having an internal resistance less than a predetermined value.
7. The system of claim 1, wherein the housing of the shielding device is made of metal, and the housing is grounded through a wire.
8. The system of claim 7, wherein the shielding means comprises: an outer shielding cavity and an inner shielding cavity;
the inner shielding cavity is arranged in the outer shielding cavity;
a first sound-absorbing layer is arranged between the outer shielding cavity and the inner shielding cavity, a second sound-absorbing layer is arranged on the inner side of the inner shielding cavity, and the microphone is placed in the inner shielding cavity.
9. The system of claim 8, wherein the shielding device further comprises a wire channel and a connecting wire;
the outer shielding cavity, the inner shielding cavity, the first silencing layer and the second silencing layer are all provided with lead channel through holes, and the lead channel through holes are used for accommodating the lead channels;
the connecting lead is arranged in the lead channel, one end of the connecting lead comprises a connector, and the connector is used for being connected with the microphone.
10. The system of claim 9, wherein the outer shielded chamber has a removable outer shielded chamber cover and the inner shielded chamber has a removable inner shielded chamber cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210053713.9A CN114363788A (en) | 2022-01-18 | 2022-01-18 | Background noise test system for microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210053713.9A CN114363788A (en) | 2022-01-18 | 2022-01-18 | Background noise test system for microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114363788A true CN114363788A (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210053713.9A Pending CN114363788A (en) | 2022-01-18 | 2022-01-18 | Background noise test system for microphone |
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|---|---|
| CN (1) | CN114363788A (en) |
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- 2022-01-18 CN CN202210053713.9A patent/CN114363788A/en active Pending
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