CN101984680B - Test device of pressure microphone and test method thereof - Google Patents
Test device of pressure microphone and test method thereof Download PDFInfo
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- CN101984680B CN101984680B CN201010538674.9A CN201010538674A CN101984680B CN 101984680 B CN101984680 B CN 101984680B CN 201010538674 A CN201010538674 A CN 201010538674A CN 101984680 B CN101984680 B CN 101984680B
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- 238000010521 absorption reaction Methods 0.000 description 4
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Abstract
The invention provides a test device of a pressure microphone, which comprises a coupling cavity, a sound source arranged in the coupling cavity, and the pressure microphone to be tested which is spaced from the sound source at a certain distance, wherein, the coupling cavity comprises a front cavity and a rear cavity which are fixedly connected together; the sound source is fixedly arranged in the rear cavity; and the front cavity is equipped with an upper wall, and the upper wall is equipped with a test hole which penetrates through the upper wall. The invention further provides a test method of the pressure microphone. The test device of the pressure microphone and the test method thereof of the invention can be applied to mass tests in a production line and can help accurately test the total harmonic distortion of the pressure microphone under high sound pressure.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to a microphone testing device and a testing method thereof, and more particularly, to a pressure microphone testing device and a testing method thereof.
[ background of the invention ]
Mobile communication technology has been rapidly developed in recent years. Consumers are increasingly using mobile communication devices, and the demand for mobile communication devices has been satisfied not only to be able to communicate but also to be able to provide a high quality communication effect. The performance of a pressure microphone, which is one of the transducers of a communication device, directly affects the quality of speech. It is therefore important to test the performance of a pressure microphone before it is used.
The pressure microphone testing device in the related art needs to measure in a silencing chamber and is not suitable for large-scale testing on a production line. And it is difficult to obtain a high sound pressure sound field with low distortion, i.e. a sound field with a sound field level of more than 120dB, when measured in an anechoic chamber. If the output voltage of the sound source is increased, the distortion is increased when the output voltage exceeds the rated voltage of the sound source, and the total harmonic distortion of the sound source is correspondingly increased, so that the total harmonic distortion of the pressure microphone under high sound pressure cannot be accurately tested.
Therefore, it is necessary to provide a new pressure microphone testing device to solve the above problems.
[ summary of the invention ]
The technical problem to be solved by the invention is to provide a pressure microphone testing device which can be suitable for large-scale test on a production line and can accurately test the total harmonic distortion of a pressure microphone under high sound pressure.
According to the technical problem, a pressure microphone testing device is designed, and the purpose is realized as follows: a pressure microphone testing device comprises a coupling cavity, a sound source arranged in the coupling cavity and a microphone to be tested, wherein the microphone to be tested is separated from the sound source by a certain distance, and the coupling cavity comprises a front cavity and a rear cavity fixedly connected with the front cavity. The sound source is fixed to be set up the back intracavity, the back intracavity has been filled with sound absorbing material, be equipped with on the back intracavity and run through the pin hole of back intracavity, the antechamber is equipped with the upper wall, the upper wall is equipped with and runs through the test hole of upper wall, the test hole is equipped with the pore wall, the pore wall be equipped with to the outstanding spacing step of test hole axis, the diameter in back intracavity is greater than the diameter in antechamber.
Preferably, the sound source abuts the front cavity.
Preferably, the sound source is a standard full band speaker.
Preferably, the test well is cylindrical.
Preferably, a sealing gasket is arranged between the front cavity and the rear cavity.
The invention also provides a testing method based on the pressure microphone testing device, which is characterized by comprising the following steps: the method comprises the following steps:
providing a sound source, wherein the sound source is a standard full-band loudspeaker;
providing a coupling cavity, wherein the coupling cavity is provided with a front cavity and a rear cavity fixedly connected with the front cavity, and the front cavity is provided with a test hole;
providing a microphone to be tested;
providing a signal source;
providing an audio analyzer;
providing a standard microphone;
calibrating the sound field formed by the sound source in the coupling cavity, which comprises the following steps:
A. placing the sound source in the rear cavity, adding the signal source to the sound source, placing the standard microphone in the test hole, connecting the audio analyzer to the sound source and the standard microphone, and obtaining a frequency response curve of the sound source fed back by the standard microphone through the audio analyzer;
B. taking the reciprocal of the frequency response curve to obtain an EQ equilibrium curve;
C. multiplying the test signal from the signal source by the EQ equalization curve to serve as a new test signal to be fed back to the sound source;
and replacing the standard microphone with the microphone to be tested, connecting the microphone to be tested with the audio analyzer and placing the microphone to be tested in the test hole, and analyzing the test result through the audio analyzer.
Compared with the related art, the pressure microphone testing device and the testing method thereof can be used for large-batch testing on a production line and can test the total harmonic distortion of the pressure microphone under high sound pressure.
[ description of the drawings ]
Fig. 1 is a three-dimensional structure diagram of the pressure microphone testing device of the present invention.
Fig. 2 is a partially exploded view of the coupling chamber of the pressure microphone of the present invention.
Fig. 3 is a perspective view of the front chamber of the pressure microphone of the present invention.
Fig. 4 is a sectional view of fig. 1 taken along line a-a.
Fig. 5 is a perspective view of the pressure microphone testing device according to the present invention during calibration.
[ detailed description ] embodiments
The invention is further described with reference to the following figures and embodiments.
As shown in fig. 1-2, a pressure microphone testing device 1, wherein the device comprises a coupling chamber 4, a sound source 5 disposed in the coupling chamber 4, and a microphone (not shown) to be tested at a distance from the sound source 5. The coupling cavity 4 comprises a front cavity 2 and a rear cavity 3 fixedly connected with the front cavity 2, the front cavity 2 and the rear cavity 3 are fixedly connected and can be connected in a welding mode, a glue bonding mode and the like, in the embodiment, the front cavity 2 and the rear cavity 3 are fixedly connected through screws, a layer of sealing ring 6 is further arranged between the front cavity 2 and the rear cavity 3, and the sealing effect is better when the front cavity 2 and the rear cavity 3 are fixedly connected through the sealing ring 6. The diameter of back chamber 3 is greater than the diameter of front chamber 2, and sound source 5 is fixed to be set up in back chamber 3, and its fixed mode can be with welding mode, glue bonding mode etc.. Preferably, the sound source 5 abuts the front cavity 2. The back cavity is filled with sound absorption materials, such as sound absorption cotton and the like. The front cavity 2 is provided with an upper wall 22, the upper wall 22 is provided with a testing hole 21 penetrating through the upper wall 22, a microphone with pressure to be tested is placed in the testing hole 21, and sound pressure emitted by the sound source 5 reaches the microphone with pressure to be tested through the front cavity 2.
Specifically, the present embodiment is described by taking the test frequency band range of 100Hz to 20KHz as an example, which is only the normal operating frequency band range of the pressure microphone, and it is also feasible to exceed the frequency band range.
The sound source 5 forms a sound field in the front cavity 2 of the coupling cavity 4, but the sound pressure of the sound field is not uniformly distributed in the radial direction in the front cavity 2, the center sound pressure is high, the edge sound pressure is low, and the difference can be reduced by reducing the diameter of the coupling cavity 4. Therefore, the smaller the diameter of the coupling cavity, the better, but the size of the coupling cavity is larger than the size of the sound source 5 and the size of the microphone to be measured, so that the sound source can be arranged in the coupling cavity 4 and the microphone to be measured can be placed in the opened test hole 21.
For the conditions required for the test, the acoustic wave in the front chamber 2 is designed as a plane wave, so that the microphone to be measured can be placed approximately in the infinite free field, so that the conditions required for the test can be met. In addition to plane waves, standing waves may also be present in the front cavity 2. Standing waves can cause peaks and valleys in a sound field, so that the sound field is not uniform, and the testing precision is affected. The standing wave is generated under the condition thatWherein,length of front cavity 2, λ acoustic wavelength, c0Is the speed of sound, f is the acoustic frequency. To prevent standing waves from occurring, the front cavity 2 is designed to have a length less than 1/4 of the wavelength of the sound wave, i.e.,when the frequency band range is 100Hz-20KHz, the actual ideal working frequency range of the front cavity obtained by the frequency response curve of the sound wave is 100Hz-12kHz, and the frequency response curve outside the range generates oscillation. Comprehensively, the length of the front cavity 2 is designed according to the highest test frequency of 15 KHz. In fact, selectedThe highest test frequency is different, and the designed front cavity 2 is different in length, but the principle is the same.
The sound source 5 is a standard full-band speaker with a flat frequency response curve and small distortion, because the standard full-band speaker can easily provide a sound field meeting the required frequency in different frequency bands. Moreover, in order to improve the testing precision, the total harmonic distortion of the sound source 5 should be less than 0.5%, and the full-band speaker can easily meet the requirement. Of course, other speakers or microphones may be used as the sound source 5.
The test well 21 is cylindrical. Of course, the test well 21 may have other shapes. According to the shape of the microphone to be tested, the shape of the test hole 21 is designed to be consistent with the shape of the microphone to be tested, and the size of the test hole 21 needs to be slightly larger than that of the microphone to be tested, so that the microphone to be tested can be more easily placed in the test hole 21.
As shown in fig. 3-4, the testing hole 21 is provided with a hole wall 24, and the hole wall 24 is provided with a limiting step 23 protruding towards the axis of the testing hole 21. The limiting step 23 is used for limiting the microphone to be tested, so that the microphone does not fall into the coupling cavity 4 during testing.
Referring again to fig. 1-2, the rear chamber 3 is provided with a lead hole 32 penetrating the rear chamber 3, and the lead hole 32 is used to lead out a wire electrically connected to the sound source 5, so that a signal can be externally applied to the sound source 5. The back cavity is filled with sound absorption materials, such as sound absorption cotton and the like.
As shown in fig. 2, 3 and 5, the present invention further provides a testing method based on the pressure microphone testing device 1 provided by the present invention, which comprises the following steps:
providing a sound source 5, wherein the sound source 5 is a standard full-band loudspeaker;
providing a coupling cavity 4, wherein the coupling cavity 4 is provided with a front cavity 2 and a rear cavity 3 fixedly connected with the front cavity 2, a layer of sealing ring 6 is also arranged between the front cavity 2 and the rear cavity 3, the sealing effect is better when the front cavity 2 is fixedly connected with the rear cavity 3 through the sealing ring 6, the front cavity 2 is provided with a test hole 21, and the test hole 21 is provided with a limit step 23;
providing a microphone to be tested;
a signal source 8 is provided which is capable of providing 1/12oct frequency sweep signal with a power of 1mW and a frequency range of 100-20 kHz. The frequency sweep signal in this embodiment refers to a series of frequency points obtained at 1/12oct intervals in a frequency range, and a single frequency corresponding to these frequency points is transmitted in sequence from a low frequency to a high frequency, where oct is an octave. Of course, other intervals such as 1/3oct, 1/6oct, etc. may be used.
Providing an audio analyzer 7;
providing a standard microphone 9;
the sound field formed by the sound source 5 in the front cavity 2 of the coupling cavity 4 is collimated. Because the free field in the front cavity 2 is attenuated, when the sound pressure level is increased, the voltage of the sound source 5 needs to be increased, and at the moment, the total harmonic distortion of the sound source 5 is correspondingly increased, so that the test requirement cannot be met. The calibration steps are as follows:
A. the sound source 5 is placed in the back cavity 3, the signal source 8 is added to the sound source 5, the standard microphone 9 is placed in the test hole 21, the audio analyzer is connected 7 to the sound source 5 and the standard microphone 9, and the sound pressure emitted by the sound source 5 reaches the standard microphone 9 through the front cavity 2 of the coupling cavity 4. Obtaining a frequency response curve of the sound source 5 fed back by the standard microphone 9 through the audio analyzer 7;
B. taking the reciprocal of the frequency response curve to obtain an EQ (equal equalization curve, for short EQ curve) equalization curve of a sound field formed in the front cavity 2 by the sound pressure emitted by the sound source 5;
C. and multiplying the sweep frequency signal from the signal source 8 by the EQ equilibrium curve to serve as a new test signal to be fed back to the sound source 5, wherein the sound field formed by the sound pressure emitted by the sound source 5 in the front cavity 2 is the sound field required by the test.
In particular, sound pressure levelUnit dB, where PeIs soundEffective value of sound pressure, P, emitted by source 5ref=2×10-5For reference sound pressure, unit: pa. A sound pressure of 1Pa corresponds to a sound pressure level of 94 dB. In a conventional anechoic chamber, the sound pressure is 1Pa, and the sound pressure level of the sound source 5 is 94dB, and if 120dB sound pressure is to be obtained, the voltage must be increased to 20 times. Through experimental tests, the sound pressure level of 94dB can be obtained when the power of the sound source 5 is 1 mW. The sound source 5 uses standard full-band loudspeakers with a nominal power of 1-2W, so that the sound source 5 requires only a small power to obtain a high sound pressure sound field in the front cavity 2 of the coupling cavity 4.
After the sound field calibration, a sound field with a frequency response range of 100-20kHz and a sound pressure level of 94dB is obtained in the coupling cavity 4, and the jitter of the sound field is less than +/-0.2 dB. And on the basis of calibration, the voltage of the sound source 5 is increased to 20 times, so that a sound field with the sound pressure level of 120dB is obtained, the total harmonic distortion of the sound field is less than 1%, and the test condition is met. Even if the sound pressure of the sound field is increased to 140dB, the total harmonic distortion value is still less than 1%.
And replacing the standard microphone 9 with the pressure microphone to be tested, connecting the pressure microphone to be tested with the audio analyzer 7 and placing the pressure microphone to be tested in the testing hole 21, and analyzing the testing result through the audio analyzer 7.
Compared with the prior art, the pressure microphone testing device has small volume, is convenient to use, is not used in an anechoic chamber, and can easily obtain a high-sound-level sound field, so that the pressure microphone testing device can be used for large-scale testing on a production line and can accurately test the total harmonic distortion of the pressure microphone under high sound pressure.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (1)
1. A method for testing a pressure microphone is characterized in that: the method comprises the following steps:
providing a sound source, wherein the sound source is a standard full-band loudspeaker;
providing a coupling cavity, wherein the coupling cavity is provided with a front cavity and a rear cavity fixedly connected with the front cavity, and the front cavity is provided with a test hole;
providing a microphone to be tested;
providing a signal source;
providing an audio analyzer;
providing a standard microphone;
calibrating the sound field formed by the sound source in the coupling cavity, which comprises the following steps:
A. placing the sound source in the rear cavity, adding the signal source to the sound source, placing the standard microphone in the test hole, connecting the audio analyzer to the sound source and the standard microphone, and obtaining a frequency response curve of the sound source fed back by the standard microphone through the audio analyzer;
B. taking the reciprocal of the frequency response curve to obtain an EQ equilibrium curve;
C. multiplying the test signal from the signal source by the EQ equalization curve to serve as a new test signal to be fed back to the sound source;
and replacing the standard microphone with the microphone to be tested, connecting the microphone to be tested with the audio analyzer and placing the microphone to be tested in the test hole, and analyzing the test result through the audio analyzer.
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| CN201010538674.9A CN101984680B (en) | 2010-11-10 | 2010-11-10 | Test device of pressure microphone and test method thereof |
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| CN201010538674.9A CN101984680B (en) | 2010-11-10 | 2010-11-10 | Test device of pressure microphone and test method thereof |
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| CN101984680B true CN101984680B (en) | 2014-07-09 |
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| CN102650545B (en) * | 2012-02-23 | 2014-04-30 | 北京航天计量测试技术研究所 | High sound intensity level calibration device with combination of high sound pressure source and phase control and method |
| CN102547547A (en) * | 2012-03-02 | 2012-07-04 | 歌尔声学股份有限公司 | Microphone test tool, test system and test method |
| CN103096234A (en) * | 2013-01-22 | 2013-05-08 | 青岛歌尔声学科技有限公司 | Microphone testing device and method |
| EP3182731A1 (en) * | 2015-12-17 | 2017-06-21 | Sony Mobile Communications, Inc. | A method for diagnosing sealing properties of microphone and/or loudspeaker seals in an electronic device |
| CN105578375B (en) * | 2015-12-31 | 2019-11-08 | 歌尔科技有限公司 | A kind of microphone test device and test method |
| CN106792391B (en) * | 2016-12-30 | 2019-02-26 | 深圳倍声声学技术有限公司 | A kind of acoustic apparatus and electronic equipment |
| CN110830902A (en) * | 2018-08-07 | 2020-02-21 | 北京京东尚科信息技术有限公司 | Testing device of microphone array |
| CN109979469B (en) * | 2019-04-03 | 2021-04-23 | 北京小米智能科技有限公司 | Signal processing method, apparatus and storage medium |
| CN111947771A (en) * | 2020-09-25 | 2020-11-17 | 杭州爱宏仪器有限公司 | Testing device suitable for sound transmission frequency response curves of various stethoscopes |
| CN113923579B (en) * | 2021-11-17 | 2023-09-26 | 美特科技(苏州)有限公司 | Loudspeaker detection method and system |
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| JP3000092B2 (en) * | 1991-08-19 | 2000-01-17 | 株式会社小野測器 | Large sound pressure adding device for measuring and calibrating microphone characteristics |
| DE4294875C2 (en) * | 1992-04-27 | 2001-05-23 | Norsonic As Tranby | Sound calibrator |
| JP3602405B2 (en) * | 2000-04-24 | 2004-12-15 | リオン株式会社 | Sound calibrator |
| JP3569202B2 (en) * | 2000-06-08 | 2004-09-22 | リオン株式会社 | Sound calibrator |
| CN101415141B (en) * | 2008-11-21 | 2012-06-13 | 瑞声声学科技(常州)有限公司 | System and method for measuring microphone response time |
| CN101651920B (en) * | 2009-06-19 | 2013-05-22 | 瑞声声学科技(深圳)有限公司 | Microphone distortion test system |
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Effective date of registration: 20170502 Address after: Singapore Ang Mo Kio 65 Street No. 10 techpoint Building 1 floor, No. 8 Co-patentee after: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Patentee after: AAC TECHNOLOGIES Pte. Ltd. Address before: 518057 Nanshan District province high tech Industrial Park, Shenzhen, North West New Road, No. 18 Co-patentee before: AAC Acoustic Technologies (Changzhou) Co.,Ltd. Patentee before: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) Co.,Ltd. |
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