CN112839291A - Device and method for testing pop sound generated by negative pressure of microphone - Google Patents
Device and method for testing pop sound generated by negative pressure of microphone Download PDFInfo
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- CN112839291A CN112839291A CN202011549767.1A CN202011549767A CN112839291A CN 112839291 A CN112839291 A CN 112839291A CN 202011549767 A CN202011549767 A CN 202011549767A CN 112839291 A CN112839291 A CN 112839291A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
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Abstract
The invention discloses a device and a method for testing pop sound generated by negative pressure of a microphone, wherein the device comprises a microphone jig, a cylinder, a transmission device, a speed reducer and a motor; the microphone jig comprises a base body, a microphone placing cavity is arranged in the base body, a cover body is arranged on the base body, and the base body is provided with a base body air pipe connector communicated with the microphone placing cavity; the power output end of the motor is connected with the speed reducer, the power output end of the speed reducer is connected with one end of the transmission device, and the other end of the transmission device is connected with the push rod of the air cylinder; the cylinder is equipped with cylinder air pipe connector, and cylinder air pipe connector connects the body air pipe connector through the trachea, and the cylinder is used for placing the chamber to the microphone and takes out air and push away gas. The invention can accurately simulate the negative pressure environment of the microphone, the air pushing and pumping frequency and speed can be accurately controlled, and the stability and the rigidness are strong. Through time delay and amplitude that analysis pop sound abnormal sound signal appears, select the good product microphone effectively to improve the earphone and wear the time appearance pop sound abnormal sound problem.
Description
Technical Field
The invention relates to the technical field of testing of earphone microphones, in particular to a device and a method for testing pop sound generated by negative pressure of a microphone.
Background
At present, when a user of the earphone finds that a part of the earphone is worn, POP sound abnormal sound occurs. The analysis shows that: under the negative pressure condition, after airflow flows from the front cavity to the rear cavity of the microphone to restore balance, and after the negative pressure disappears suddenly, the vibration of the microphone diaphragm during rebound can generate POP sound; in order to verify the conclusion, the microphone is wrapped by plasticine, a negative pressure is applied to the microphone by the injector, the development board is used as a sound card and connected with the microphone, the audio processing software audio records the transient change of the output voltage of the microphone along with time to obtain an FFT audio curve map, and referring to fig. 4, in the audio curve map, according to the abnormal sound curve of the POP sound, the time delay of the abnormal sound of the POP sound can be seen, and the amplitude of the abnormal sound of the POP sound can also be seen. However, the data obtained by recording for many times according to the method is unstable and accurate, and the time delay and amplitude of the abnormal sound of the POP sound are influenced by the air pushing and pumping frequency, the speed and the size of the plasticine air holes. Meanwhile, in the process of comparing microphones with various sensitivities, the plasticine is disassembled and assembled, so that the consistency of installation at each time cannot be ensured, and objective comparison results cannot be obtained. Therefore, the test method is not high in rigor and only can be used for reproducing abnormal sound, and the occurrence time delay and amplitude of the abnormal sound of the related specific data have no reference. Therefore, a stable and regular FFT audio curve map cannot be obtained, and analysis is difficult.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device for testing pop sound generated by microphone negative pressure, which can accurately simulate the microphone negative pressure environment, and has the advantages of accurate control of air pushing and pumping frequency and speed, strong stability and high rigor. Therefore, the invention also provides a testing method of the device for testing the negative pressure of the microphone to generate the pop sound.
In order to solve the first technical problem, the technical scheme of the invention is as follows: a device for testing the pop sound generated by the negative pressure of a microphone comprises a microphone jig, a cylinder, a transmission device, a speed reducer and a motor; the microphone jig comprises a base body, a microphone placing cavity is arranged in the base body, a cover body is arranged on the base body, and the base body is provided with a base body air pipe connector communicated with the microphone placing cavity; the power output end of the motor is connected with the speed reducer, the power output end of the speed reducer is connected with one end of the transmission device, and the other end of the transmission device is connected with the push rod of the air cylinder; the cylinder is equipped with the cylinder air pipe connector, and the cylinder air pipe connector is connected the body air pipe connector through the trachea, and the cylinder is used for placing the chamber to the microphone of microphone tool and is bled and push away gas.
Preferably, the base body of the microphone jig is provided with an air hole communicated with the microphone placing cavity.
Preferably, the transmission device comprises a first connecting rod, a second connecting rod and a pushing block, the power output end of the speed reducer is provided with a rotating shaft, the rotating shaft is connected with one end of the first connecting rod and used for driving the first connecting rod to rotate, the other end of the first connecting rod is movably hinged with one end of the second connecting rod, the other end of the second connecting rod is movably hinged with the pushing block, and the pushing block is fixedly connected with the pushing rod of the air cylinder. The lower part of the transmission device is provided with a slide rail, the length direction of the slide rail is consistent with the length direction of the air cylinder push rod, the lower end of the push block is connected with a slide block, and the slide block is slidably arranged on the slide rail.
Preferably, the device for testing the production of the pop sound by the negative pressure of the microphone further comprises a controller, the controller is electrically connected with the motor, and the controller is provided with a power switch and a motor speed regulation knob.
Preferably, the device for testing the production of pop sound by the negative pressure of the microphone further comprises a box body, the cylinder, the transmission device, the speed reducer, the motor and the controller are respectively installed in the box body, an upper cover plate is arranged on the upper side of the box body, the microphone jig is installed on the upper cover plate, and the upper end of the controller extends out of the upper cover plate.
In order to solve the second technical problem, the technical solution of the present invention is: the testing method of the device for testing the pop sound generated by the negative pressure of the microphone comprises the following testing steps:
s1, placing a microphone in a microphone placing cavity of a microphone jig, extending the wiring of the microphone out of the microphone jig, connecting the wiring of the microphone with a development board, and recording sound signals by using the development board as a sound card;
s2, controlling a motor to work at a set speed, driving a cylinder to work by the motor through a transmission device, and performing air extraction and air pushing actions on a microphone placing cavity of the microphone jig by the cylinder;
and S3, recording transient change of the microphone output voltage along with time by using an audio processing device to obtain an audio curve map, and testing time delay and amplitude of the microphone pop abnormal sound signal.
Preferably, the microphones with different sensitivities are respectively placed in the microphone placing cavities of the microphone jig, the connecting wires of the microphones with different sensitivities are respectively connected with the development board, and the steps S2 and S3 are repeated to respectively test the time delay and amplitude of the pop sound and abnormal sound signals of the microphones.
Preferably, the controller controls each air pushing and air extracting cycle, so as to control the air pressure in the microphone placing cavity of the microphone jig, and the air pressure range of the microphone placing cavity relative to the outside is-0.015-0.022 MPa.
The invention has the beneficial effects that: the microphone fixture comprises a microphone placing cavity, the base body is provided with a base body air pipe connector communicated with the microphone placing cavity, and the microphone placing cavity can be pumped and pushed by the base body air pipe connector, so that the microphone placing cavity can accurately simulate a microphone negative pressure environment; the motor can drive the speed reducer to work, the speed reducer can drive the transmission device to work, and the transmission device can drive the push rod of the air cylinder to push back and forth; the air pipe joint of the air cylinder is connected with the air pipe joint of the air cylinder body through the air pipe, so that air suction and air pushing of the microphone placing cavity can be realized along with the back and forth pushing of the air cylinder push rod, negative pressure can be generated in the microphone placing cavity during air suction, and air pressure in the microphone placing cavity can be recovered during air pushing; therefore, the invention can accurately simulate the negative pressure environment of the microphone, the air pushing and pumping frequency and speed can be accurately controlled, and the stability and the rigidness are strong. According to the testing method, air suction and air push actions can be performed on the microphone placing cavity of the microphone jig through the air cylinder, then the sound signals recorded by the development board are used for recording transient changes of the output voltage of the microphone along with time through the audio processing device, an audio curve atlas is obtained, the time delay and amplitude of the pop sound abnormal sound signals of the microphone are tested, the accuracy is high, the air suction speed of air push each time is guaranteed, the pop sound abnormal sound signals of the microphone are tested, and good-quality microphones are effectively screened out through analyzing the time delay and amplitude of the pop sound abnormal sound signals, so that the problem of the pop sound abnormal sound when the earphone is worn is solved. The microphones with different sensitivities are placed in the same sealed microphone jig, and only the wiring needs to be replaced when the microphones are replaced, so that the consistency of the testing environment is ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic structural view of the box body after the box plate of the box body is pulled open.
Fig. 3 is a schematic structural diagram of a microphone fixture.
Fig. 4 is a graph of an FFT audio curve of a pop tone generated by testing microphone negative pressure in the prior art.
FIG. 5 is one of the FFT audio curve maps for the pop tone generated by the negative pressure of the test microphone of the present invention.
FIG. 6 is a second FFT audio curve map for the pop tone generated by the negative pressure of the testing microphone according to the present invention.
FIG. 7 is a third graph of an FFT audio curve for pop tone generation using negative pressure in a test microphone of the present invention.
In the figure: 1. a microphone fixture; 11. a base body; 111. a seat body air pipe joint; 112. air holes are formed; 12. a cover body; 2. a cylinder; 21. a cylinder air pipe joint; 22. a push rod; 3. a transmission device; 31. a first link; 32. a second link; 33. a push block; 4. a speed reducer; 41. a rotating shaft; 5. a motor; 6. a slide rail; 7. a slider; 8. a controller; 81. a power switch; 82. a motor speed regulation knob; 9. a box body; 91. and an upper cover plate.
Detailed Description
The structural and operational principles of the present invention are explained in further detail below with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the present invention is a device for testing the negative pressure of a microphone to generate pop sound, which comprises a microphone fixture 1, a cylinder 2, a transmission device 3, a speed reducer 4 and a motor 5; the microphone jig 1 comprises a base body 11, a microphone placing cavity is arranged in the base body, a cover body 12 is arranged on the base body 11, and the base body 11 is provided with a base body air pipe joint 111 communicated with the microphone placing cavity; the power output end of the motor 5 is connected with the speed reducer 4, the power output end of the speed reducer 4 is connected with one end of the transmission device 3, and the other end of the transmission device 3 is connected with the push rod 22 of the cylinder 2; the cylinder is provided with a cylinder air pipe connector 21, the cylinder air pipe connector 21 is connected with the cylinder air pipe connector 111 through an air pipe (not shown in the figure), and the cylinder 2 is used for exhausting and pushing air in a microphone placing cavity of the microphone jig.
As shown in fig. 1, 2 and 3, the base of the microphone fixture is provided with an air hole 112 communicating with the microphone placing cavity. Because the microphone diaphragm is easily crushed by overhigh air pressure or overlow air pressure when the air cylinder has overlarge air pumping and pushing force, the air holes 112 are additionally arranged, so that the earphone diaphragm can be prevented from being crushed by the air pressure.
As shown in fig. 1, fig. 2 and fig. 3, the transmission device 3 includes a first connecting rod 31, a second connecting rod 32 and a pushing block 33, the power output end of the speed reducer 4 has a rotating shaft 41, the rotating shaft 41 is connected to one end of the first connecting rod 31 for driving the first connecting rod 31 to rotate, the other end of the first connecting rod 31 is movably hinged to one end of the second connecting rod 32, the other end of the second connecting rod 32 is movably hinged to the pushing block 33, and the pushing block 33 is fixedly connected to the pushing rod 22 of the cylinder 2. A slide rail 6 is arranged below the transmission device 3, the length direction of the slide rail 6 is consistent with that of the cylinder push rod 22, the lower end of the push block 33 is connected with a slide block 7, and the slide block 7 is slidably arranged on the slide rail 6.
As shown in fig. 1, fig. 2 and fig. 3, the device for testing the negative pressure of the microphone to generate the pop sound further comprises a controller 8, the controller 8 is electrically connected to the motor 5, and the controller 8 is provided with a power switch 81 and a motor speed regulation knob 82.
As shown in fig. 1, 2 and 3, the device for testing the negative pressure of the microphone to generate pop sound further includes a box 9, the cylinder 2, the transmission device 3, the speed reducer 4, the motor 5 and the controller 8 are respectively installed in the box 1, an upper cover plate 91 is arranged on the upper side of the box 9, the microphone fixture 1 is installed on the upper cover plate 91, and the upper end of the controller 8 extends out of the upper cover plate 91.
The invention relates to a method for testing a device for testing the pop sound generated by the negative pressure of a microphone, which comprises the following testing steps:
s1, placing a microphone in a microphone placing cavity of a microphone jig, covering a cover body, extending a wiring of the microphone out of the microphone jig, connecting the wiring of the microphone with a development board, and recording a sound signal by using the development board as a sound card;
s2, controlling a motor to work at a set speed, starting the motor, driving a speed reducer to work, driving a transmission device to work by the speed reducer, driving a push rod of a cylinder to push back and forth by the transmission device, and connecting a cylinder air pipe joint with a cylinder air pipe joint through an air pipe, so that air suction and air pushing actions on a microphone placing cavity can be realized along with the back and forth pushing of the cylinder air pipe joint; when air is pumped out, negative pressure is generated in the microphone placing cavity, when air is pushed out, the air pressure in the microphone placing cavity can be recovered, and the frequency and the speed of each air pushing and air pumping circulation can be controlled to be consistent by controlling the rotating speed of the motor
And S3, developing the sound signals recorded by the board, recording the transient change of the output voltage of the microphone along with time by using audio processing software Audio of the audio processing device to obtain an FFT audio curve map, and referring to fig. 5, from the FFT audio curve map, according to a POP sound abnormal sound curve generated by air pushing and air extracting, observing that the time delay and the amplitude of the occurrence of the POP sound abnormal sound are stable, testing the time delay and the amplitude of the occurrence of the POP sound abnormal sound signals of the microphone, and providing objective data for subsequent analysis. Therefore, the method can accurately simulate the negative pressure environment of the microphone, the air pushing and pumping frequency and speed can be accurately controlled, and the method is strong in stability and high in rigor.
And respectively placing the microphones with different sensitivities into the microphone placing cavities of the microphone jig, respectively connecting the connecting wires of the microphones with different sensitivities with the development board, repeating the steps S2 and S3, and respectively testing the time delay and amplitude of the pop sound and abnormal sound signals of the microphones.
The controller controls air pushing and air extracting circulation every time, so that the air pressure in the microphone placing cavity of the microphone jig is controlled, and the air pressure range of the microphone placing cavity relative to the outside is-0.015-0.022 Mpa. The air pressure in the microphone placing cavity of the microphone jig is consistent with that in the earphone worn by a person as much as possible, and accurate test results are guaranteed to be obtained.
The basis for judging the abnormal sound signal is as follows: amplifying the curve of one of the extraction sections, 1) it can be seen that after a delay of extraction, a sudden change in signal occurs, see fig. 6, for a nearly vertical spike; 2) looking at the audio energy spectrum, see fig. 7, a very high energy jump can also be observed at the abnormal sound signal; 3) playing this portion of audio enables the pop sound to be heard.
Therefore, the part is judged to be pop abnormal sound. Continuing to analyze the abnormal noise signal, it can be seen that there are two important factors, the amplitude of the abnormal noise and the time delay that occurs. The abnormal sound amplitude is the volume of the abnormal sound heard by people; the prolonged abnormal sound is more easily perceived from the human ear auditory viewpoint.
The above description is only a preferred embodiment of the present invention, and all the minor modifications, equivalent changes and modifications made to the above embodiment according to the technical solution of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a device that test microphone negative pressure produced pop sound which characterized in that: comprises a microphone jig, a cylinder, a transmission device, a speed reducer and a motor; the microphone jig comprises a base body, a microphone placing cavity is arranged in the base body, a cover body is arranged on the base body, and the base body is provided with a base body air pipe connector communicated with the microphone placing cavity; the power output end of the motor is connected with the speed reducer, the power output end of the speed reducer is connected with one end of the transmission device, and the other end of the transmission device is connected with the push rod of the air cylinder; the cylinder is equipped with the cylinder air pipe connector, and the cylinder air pipe connector is connected the body air pipe connector through the trachea, and the cylinder is used for placing the chamber to the microphone of microphone tool and is bled and push away gas.
2. The apparatus of claim 1, wherein the means for generating pop sound by testing microphone negative pressure comprises: the base body of the microphone jig is provided with air holes communicated with the microphone placing cavity.
3. The apparatus of claim 1, wherein the means for generating pop sound by testing microphone negative pressure comprises: the transmission device comprises a first connecting rod, a second connecting rod and a push block, wherein the power output end of the speed reducer is provided with a rotating shaft, the rotating shaft is connected with one end of the first connecting rod and used for driving the first connecting rod to rotate, the other end of the first connecting rod is movably hinged with one end of the second connecting rod, the other end of the second connecting rod is movably hinged with the push block, and the push block is fixedly connected with the push rod of the air cylinder.
4. The apparatus of claim 3, wherein the negative pressure of the test microphone generates pop sound, and the apparatus further comprises: the lower part of the transmission device is provided with a slide rail, the length direction of the slide rail is consistent with the length direction of the air cylinder push rod, the lower end of the push block is connected with a slide block, and the slide block is slidably arranged on the slide rail.
5. The apparatus of claim 1, wherein the means for generating pop sound by testing microphone negative pressure comprises: the motor speed regulation device is characterized by also comprising a controller, wherein the controller is electrically connected with the motor and is provided with a power switch and a motor speed regulation knob.
6. The apparatus of claim 5, wherein the negative pressure of the test microphone generates pop sound, and the apparatus further comprises: the microphone fixture is characterized by further comprising a box body, the air cylinder, the transmission device, the speed reducer, the motor and the controller are installed in the box body respectively, an upper cover plate is arranged on the upper side of the box body, the microphone fixture is installed on the upper cover plate, and the upper end of the controller extends out of the upper cover plate.
7. A test method for testing a device for generating pop sound by using negative pressure of a microphone according to any one of claims 1 to 6, comprising the following test steps:
s1, placing a microphone in a microphone placing cavity of a microphone jig, extending the wiring of the microphone out of the microphone jig, connecting the wiring of the microphone with a development board, and recording sound signals by using the development board as a sound card;
s2, controlling a motor to work at a set speed, driving a cylinder to work by the motor through a transmission device, and performing air extraction and air pushing actions on a microphone placing cavity of the microphone jig by the cylinder;
and S3, recording the transient change of the microphone output voltage along with time by using the audio processing device to obtain an audio curve map, and testing the time delay and amplitude of the microphone pop sound abnormal sound signal.
8. The method for testing the device for generating pop sound by using negative pressure of a microphone according to claim 7, wherein the method comprises the following steps: and respectively placing the microphones with different sensitivities into the microphone placing cavities of the microphone jig, respectively connecting the connecting wires of the microphones with different sensitivities with the development board, repeating the steps S2 and S3, and respectively testing the time delay and amplitude of the pop sound and abnormal sound signals of the microphones.
9. The method for testing the device for generating pop sound by using negative pressure of a microphone according to claim 7, wherein the method comprises the following steps: the controller controls air pushing and air extracting circulation every time, so that the air pressure in the microphone placing cavity of the microphone jig is controlled, and the air pressure range of the microphone placing cavity relative to the outside is-0.015-0.022 Mpa.
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| CN202011549767.1A CN112839291B (en) | 2020-12-24 | 2020-12-24 | Device and method for testing pop sound generated by negative pressure of microphone |
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| CN202011549767.1A CN112839291B (en) | 2020-12-24 | 2020-12-24 | Device and method for testing pop sound generated by negative pressure of microphone |
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| CN201976252U (en) * | 2010-12-20 | 2011-09-14 | 歌尔声学股份有限公司 | Microphone tightness testing tool and testing system |
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