CN105578375A - Microphone test device and test method - Google Patents
Microphone test device and test method Download PDFInfo
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- CN105578375A CN105578375A CN201511030737.9A CN201511030737A CN105578375A CN 105578375 A CN105578375 A CN 105578375A CN 201511030737 A CN201511030737 A CN 201511030737A CN 105578375 A CN105578375 A CN 105578375A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/05—Detection of connection of loudspeakers or headphones to amplifiers
Abstract
The invention discloses a microphone test device and test method. The device comprises a sound source device and at least first level coupler; the at least first level coupler is used for coupling the sound source device and a to-be-tested microphone array so as to form a sound source coupling cavity; the microphone array elements in the to-be-tested microphone array are grouped through the coupler; the microphone array elements in each group are symmetrical relative to the sound source axis; and the sound signals sent by the sound source device are transmitted to to-be-tested microphones through the sound source coupling cavity. According to the technical solution of the embodiment of the invention, the frequency responses and distortions, especially the phase differences of the array elements in the microphone array products can be tested accurately and reliably; the repeatability is good; the operation is simple and convenient; no space is occupied; therefore, through integrating the method and the device in automatic tests, the production efficiency is improved; and the production cost is saved.
Description
Technical field
The present invention relates to microphone technical field of measurement and test, be specifically related to a kind of microphone testing apparatus and method of testing.
Background technology
Along with the extensive use of microphone array product, the frequency response of each array element, the phase difference between distortion and array element more and more receive publicity.We can carry out to obtain the azimuth information of sound source by the phase difference calculated in microphone array between array element, but we need first to ensure that the original phase difference in array product between each array element is known, this just needs measurement scheme accurately and reliably to come array element frequency response, distortion in microphone array product, the particularly test of phase difference between array element.
The method of testing of existing microphone array product mostly is free field test, obtain more real free field environment, and need to use larger anechoic chamber, the cost building anechoic chamber is high, and maintenance cost is higher.Usually use miniaturized Sound Attenuator as the compromise of performance and price on a production line, but the Sound Attenuator of miniaturization does not have sound-absorbing effect to low-frequency sound, accurately cannot detect the low frequency performance of product to be measured, have influence on the acoustical behavior of product, and still can take more production space and be unfavorable for that automatic production line is arranged.
It can thus be appreciated that do not complete accurately and reliably in prior art array element frequency response, distortion in microphone array product, particularly between array element, phase difference carries out the scheme of testing.
Summary of the invention
The invention provides a kind of microphone testing apparatus and method of testing, do not complete array element frequency response, distortion in microphone array product accurately and reliably to solve in prior art, the problem of the particularly test of phase difference between array element.
According to an aspect of the present invention, provide a kind of microphone testing apparatus, this device comprises: sound source device and at least one grade coupled device;
At least one grade coupled device, for sound source device and the microphone array to be tested of being coupled, forms sound source coupling cavity; By coupler, the microphone array element in described microphone array to be tested is divided into groups, make the position of the microphone array element in each group all about sound source axisymmetrical;
The acoustical signal that described sound source device sends, is passed to microphone to be tested through described sound source coupling cavity.
Alternatively, when the progression of described coupler is one-level, one end face of this coupler seals with microphone array to be tested and is coupled, the subtend end face of this end face is coupled with described sound source device sealing, form sound source coupling cavity, the acoustical signal that described sound source device is sent and microphone array to be tested are coupling in this sound source coupling cavity.
Alternatively, when the progression of described coupler is two-stage,
One end face of first order coupler is coupled with described sound source device sealing, the subtend end face of an end face of first order coupler and an end coupling of second level coupler, forms first order sound source coupling cavity;
Subtend end face and the microphone array to be tested of one end face of second level coupler seal to be coupled and form second level sound source coupling cavity;
Wherein, the microphone array element in microphone array to be tested is placed on the position about sound source axisymmetrical in the sound source coupling cavity of the described second level;
The acoustical signal that described sound source device sends, first through described first order sound source coupling cavity, then is passed to the microphone array element in microphone array to be tested through described second level sound source coupling cavity.
Alternatively, the shape of the shape of the coupler be coupled with described sound source device sealing and the shell of described sound source device is suitable.
This device comprises further: pressure apparatus;
Pressure apparatus, contacts with microphone array to be tested, and for applying pressure to microphone array to be tested, to strengthen being coupled of microphone array to be tested and coupler.
According to another aspect of the present invention, provide a kind of microphone method of testing, this method of testing comprises:
At least one grade coupled device is utilized to be coupled microphone array to be tested and sound source device, form sound source coupling cavity, wherein, by coupler, the microphone array element in described microphone array to be tested is divided into groups, make microphone array element in each group all about sound source axisymmetrical;
Control described sound source device by testing software and send acoustical signal, make this acoustical signal be passed to microphone array to be tested through described sound source coupling cavity;
Gather and analyze the acoustical signal that in microphone array to be tested, each array element receives, obtaining test result.
Alternatively, described be coupled microphone array to be tested and the sound source device of at least one grade coupled device that utilize comprises:
One end face of coupler is sealed with microphone array to be tested and is coupled, the subtend end face of one end face is coupled with described sound source device sealing, form sound source coupling cavity, the acoustical signal that described sound source device is sent and microphone array to be tested are coupling in this sound source coupling cavity.
Alternatively, be coupled microphone array to be tested and sound source device of at least one grade coupled device is utilized also to comprise:
Described be coupled microphone array to be tested and the sound source device of at least one grade coupled device that utilize also comprises:
Utilize first order coupler and second level coupler; And an end face of described first order coupler is coupled with described sound source device sealing, the subtend end face of an end face of first order coupler and an end coupling of second level coupler, form first order sound source coupling cavity;
The subtend end face of one end face of second level coupler and microphone array to be tested are sealed to be coupled and forms second level sound source coupling cavity;
Wherein, the microphone array element in microphone array to be tested is placed on the position about sound source axisymmetrical in the sound source coupling cavity of the described second level;
Control the acoustical signal that described sound source device sends, first through described first order sound source coupling cavity, then be passed to the microphone array element in microphone array to be tested through described second level sound source coupling cavity.
Alternatively, the method comprises:
According to the shape of the profile design coupler of sound source device, make the shape of coupler form and described sound source device suitable.
Alternatively, the method comprises further: utilize pressure apparatus to contact with microphone array to be tested, and applies pressure to described microphone array to be tested, to strengthen being coupled of microphone array to be tested and coupler.
The invention has the beneficial effects as follows: the invention provides a kind of microphone testing apparatus, this microphone testing apparatus comprises at least one grade coupled device, and sound source and microphone to be tested are coupling in independently in the rigidity operatic tunes by this coupler, mineralization pressure field test environment.Utilize the isotropic feature of acoustic pressure in pressure chamber, detect frequency response and the distortion of microphone array element to be measured; By microphone to be tested being placed on the position about sound source symmetry in pressure chamber, control sound source consistent to the acoustic path of each microphone array element to be measured, ensure that between the microphone array element that test obtains, phase difference can reflect the difference between array element really, realize the accurately frequency response of test microphone array element, the phase difference between distortion and array element.Further, this microphone testing apparatus of the present invention take up room little, be conducive to automatic production line arrangement, simple to operate, testing efficiency is high.Present invention also offers a kind of method of testing utilizing this microphone testing apparatus, this method of testing, owing to utilizing the microphone testing apparatus of the present embodiment, thus also has reproducible, improves testing efficiency high, the effect saved production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the microphone testing apparatus of one embodiment of the invention;
Fig. 2 a is the structural representation before the microphone testing apparatus assembling of another embodiment of the present invention;
Fig. 2 b is the structural representation after the microphone testing apparatus assembling of another embodiment of the present invention;
Fig. 3 a is the structural representation before the assembling of the microphone testing apparatus of another embodiment of the present invention;
Fig. 3 b is the structural representation after the assembling of the microphone testing apparatus of another embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the microphone method of testing of one embodiment of the invention.
Embodiment
Core concept of the present invention is: utilize pressure field test frequency response good stability, feature that signal to noise ratio is high, design a kind of coupler that can carry out pressure field test, and be used for being coupled microphone to be tested and sound source device form sound source coupling cavity.And by designing microphone to be tested in pressure chamber about sound source axisymmetrical, sound source can be controlled consistent to the acoustic path of each microphone array element to be measured, ensure that between the microphone array element that test obtains, phase difference can reflect the difference between array element really, thus test the frequency response of microphone array element, the phase difference between distortion and array element exactly.
Embodiment one
Fig. 1 is the structural representation of the microphone testing apparatus of one embodiment of the invention, and see Fig. 1, this microphone testing apparatus comprises: sound source device 11 and at least one grade coupled device 10;
At least one grade coupled device 10, for sound source device 11 and the microphone to be tested 12 of being coupled, forms sound source coupling cavity 13; Wherein, microphone 12 to be tested is placed on position symmetrical about sound source axis (namely in Fig. 1, dotted line is shown) in sound source coupling cavity 13;
The acoustical signal that sound source device 11 sends, is passed to microphone 12 to be tested through sound source coupling cavity 13.
As shown in Figure 1, the progression of coupler 10 is one-level, one end face of this coupler 10 seals with microphone 12 to be tested and is coupled, the subtend end face of this end face seals with sound source device 11 and is coupled, form sound source coupling cavity 13, the acoustical signal that sound source device 11 is sent and microphone to be tested 12 are coupling in this sound source coupling cavity 13.
Here sound source device 11 comprises: sound source shell and electroacoustic transducer 110; In Fig. 1, sound source device 11 also comprises power amplifier 111, and power amplifier 111 can be arranged in sound source shell, also can be external.
During actual test, sound source device 11 can use the artificial mouth product of the extensive use of prior art, and select a high performance loud speaker (loudspeaker) as electro-acoustic transducing device 110, in extremely low power application scenarios, receiver (receiver) also can be used as electro-acoustic transducing device 110.Can select as required in practical application, this is not restricted.
The course of work of the testing apparatus shown in Fig. 1 is: use Fig. 1 testing apparatus to carry out microphone test, testing software feeds the sound source device detection signal of telecommunication, sound source device sends acoustical signal, isotropic pressure field acoustical signal that formation one is stable inside sound source coupling cavity, acoustical signal is delivered to each microphone place to be tested to be measured, after each microphone to be tested collects voice signal, pass to test computer, obtain recording file, analyze frequency response, phase information between distortion and array element that recording file can obtain each microphone array element.
It should be noted that, this microphone testing apparatus of the present embodiment both can be used for testing microphone array and also can be used for testing microphone monomer, did not limit this.As long as microphone to be tested is placed on the position about sound source axisymmetrical.Such as, during test microphone monomer, this microphone monomer is placed on the just right position of sound source axis.
Embodiment two
Fig. 2 a is the structural representation before the microphone testing apparatus assembling of another embodiment of the present invention, Fig. 2 b is the structural representation after the microphone testing apparatus assembling of another embodiment of the present invention, is specifically described this microphone testing apparatus of one embodiment of the invention below in conjunction with Fig. 2 a and Fig. 2 b.
See Fig. 2 a and Fig. 2 b, show one-level coupler 20, sound source device 22 and comprise the microphone array to be tested 21 of four microphone array elements (MIC1 & 2, the MIC3 & 4 see shown in Fig. 2 b).Four microphone array elements (MIC1 & 2, MIC3 & 4) in microphone array 21 and all symmetrical between sound source axis (dotted line see in Fig. 2 b).By coupler 20, the microphone array element in microphone array 21 to be tested is divided into groups, make the position of the microphone array element in each group all meet condition about sound source axisymmetrical.
In the present embodiment, by coupler 20 the grouping of microphone array element, the microphone array element of each group is all positioned at the position about sound source axisymmetrical.In so actual test process, the combination of coupler 20 and sound source device 22 can be adjusted.Concrete, as shown in Figure 2 b, first test first group of array element (MIC1 & 2), and then second group of array element (MIC3 & 4) tested by the sound source device 22 that moves right, each group is tested respectively, thus obtains frequency response, the phase information between distortion and array element of each microphone array element in each group.
See Fig. 2 b, this microphone testing apparatus of the present embodiment also comprises: pressure apparatus 23, contact with microphone to be tested (i.e. microphone array 21), and apply pressure to microphone array 21, to strengthen being coupled of microphone array 21 and coupler 20, guarantee the sealing of testing apparatus, improve the accuracy of test result.
See Fig. 2 b, sound source device 22 comprises: sound source shell and electroacoustic transducer.In the present embodiment, the shape sealing the coupler 20 be coupled with sound source device 22 is suitable with the shell going back sound source device 22, in actual application, coupler 20 carries out contoured design according to the profile of testing the sound source device 22 (as artificial mouth) used, and object realizes coupler 20 to be coupled with the sealing of sound source device 22.In addition, the shape of coupler 20 and the shape of microphone array 21 suitable, realize coupler 20 and carry out acoustic seal with microphone array product 21 and be coupled.
It should be noted that, this microphone testing apparatus of the present embodiment both can be used for testing microphone array and also can be used for testing microphone monomer, did not limit, as long as microphone to be tested is placed on the position about sound source axisymmetrical to this.
Embodiment three
Fig. 3 a is the structural representation before the assembling of the microphone testing apparatus of another embodiment of the present invention, and Fig. 3 b is the structural representation after the assembling of the microphone testing apparatus of another embodiment of the present invention.Be specifically described the structure comprising two-stage coupler below in conjunction with Fig. 3 a and Fig. 3 b, other guide is see other embodiments of the invention.
See Fig. 3 a and Fig. 3 b, illustrate the microphone testing apparatus of the array product of testing multiple microphone array element, it is consistent for realizing by two-stage coupler the path that imparts acoustic energy is delivered to each array element, and then the frequency response of accurate test Mike array element, phase difference between distortion and array element.
When in the present embodiment, the number of stages of coupler is two-stage, an end face of first order coupler 30 seals with sound source device 33 and is coupled, the subtend end face of an end face of first order coupler 30 and an end coupling of second level coupler 31, forms first order sound source coupling cavity; The subtend end face of one end face of second level coupler 31 seals to be coupled with microphone 32 to be tested and forms second level sound source coupling cavity; Wherein, the array element of microphone array to be tested is placed on position symmetrical about sound source axis (dotted line see in Fig. 3 b) in the sound source coupling cavity of the second level;
The acoustical signal that sound source device 33 sends, first through first order sound source coupling cavity, then is passed to microphone 32 to be tested through second level sound source coupling cavity.
In the present embodiment, microphone to be tested is that microphone array 32 comprises four microphone array elements (see the MIC1 & 2 shown in Fig. 2 b, MIC3 & 4), the shape of second level coupler 31 and the shape of microphone array 32 suitable;
By coupler 31, the microphone array element in microphone array to be tested is divided into groups, make the position of the microphone array element in each group all meet condition about sound source axisymmetrical.
See Fig. 3 b, this testing apparatus comprises further: pressure apparatus 34, and pressure apparatus 34 contacts with microphone to be tested and for applying pressure to microphone to be tested, to strengthen being coupled of microphone to be tested and coupler.
See Fig. 3 b, sound source device 33 comprises: sound source shell and electroacoustic transducer.
In addition, in the present embodiment, the shell sealing the shape of the first order coupler 30 be coupled and sound source device with sound source device 33 is suitable, to ensure that first order coupler is coupled with the sealing of sound source device.
It should be noted that, it is the exemplary illustration carried out with two-stage coupler coupling sound source device and microphone to be measured in the present embodiment, but be not limited to this, in other embodiments of the invention, coupler more than two-stage can be set to improve testing efficiency further.
Embodiment four
Fig. 4 is the schematic flow sheet of the microphone method of testing of one embodiment of the invention, is mainly described the performing step of microphone method of testing in the present embodiment, and other guide is see other embodiments of the present invention.
See Fig. 4, this microphone method of testing comprises the steps:
Step S41, utilize at least one grade coupled device to be coupled microphone array to be tested and sound source device, form sound source coupling cavity, wherein, by coupler, the microphone array element in described microphone array to be tested is divided into groups, make microphone array element in each group all about sound source axisymmetrical;
Step S42, controls sound source device by testing software and sends acoustical signal, make this acoustical signal be passed to microphone array to be tested through sound source coupling cavity;
Step S43, gathers and analyzes the acoustical signal that in microphone array to be tested, each array element receives, obtaining test result.
In one embodiment of the invention, be coupled microphone to be tested and sound source device of at least one grade coupled device is utilized to comprise:
Sealed with microphone to be tested by one end face of coupler and be coupled, be coupled by the subtend end face of an end face with sound source device sealing, form sound source coupling cavity, the acoustical signal that sound source device is sent and microphone to be tested are coupling in this sound source coupling cavity.
In another embodiment of the present invention, be coupled microphone to be tested and sound source device of at least one grade coupled device is utilized to comprise:
Utilize first order coupler and second level coupler; And an end face of first order coupler is coupled with sound source device sealing, the subtend end face of an end face of first order coupler and an end coupling of second level coupler, form first order sound source coupling cavity; The subtend end face of one end face of second level coupler and microphone to be tested are sealed to be coupled and forms second level sound source coupling cavity; By coupler, the microphone array element in described microphone array to be tested is divided into groups, make microphone array element in each group all about sound source axisymmetrical;
Control the acoustical signal that sound source device sends, first through first order sound source coupling cavity, then be passed to microphone to be tested through second level sound source coupling cavity.
It should be noted that, the performing step of this microphone method of testing in the present embodiment is corresponding with the course of work of aforementioned microphone testing apparatus, therefore, the specific implementation step of the microphone method of testing of the present embodiment see the related description of the course of work part of aforementioned microphone testing apparatus, can not repeat them here.
In summary, this microphone testing apparatus of the embodiment of the present invention and method of testing, first, utilize coupler, sound source and microphone array are coupling in independently in the rigidity operatic tunes, form the test environment of a pressure field, and utilize the isotropic feature of acoustic pressure in pressure chamber, detect frequency response and the distortion of microphone array element to be measured; Secondly, by designing microphone to be tested in the operatic tunes about sound source axisymmetrical, control sound source consistent to the acoustic path of each microphone array element to be measured, ensure that between the microphone array element that test obtains, phase difference reflects the difference between array element really, thus achieve the effect of testing the frequency response of microphone array element, the phase difference between distortion and array element exactly.Finally, the technical scheme favorable repeatability of the embodiment of the present invention, simple to operation, and it is little to take up room, is conducive to being incorporated into automatic test, saves production cost, if arrange multiple coupler test microphone array product, testing efficiency can also be improved further.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a microphone testing apparatus, is characterized in that, this device comprises: sound source device and at least one grade coupled device;
At least one grade coupled device, for sound source device and the microphone array to be tested of being coupled, forms sound source coupling cavity; By coupler, the microphone array element in described microphone array to be tested is divided into groups, make microphone array element in each group all about sound source axisymmetrical;
The acoustical signal that described sound source device sends, is passed to microphone to be tested through described sound source coupling cavity.
2. device according to claim 1, it is characterized in that, when the progression of described coupler is one-level, one end face of this coupler seals with microphone array to be tested and is coupled, the subtend end face of this end face is coupled with described sound source device sealing, form sound source coupling cavity, the acoustical signal that described sound source device is sent and microphone array to be tested are coupling in this sound source coupling cavity.
3. device according to claim 1, is characterized in that, when the progression of described coupler is two-stage,
One end face of first order coupler is coupled with described sound source device sealing, the subtend end face of an end face of first order coupler and an end coupling of second level coupler, forms first order sound source coupling cavity;
Subtend end face and the microphone array to be tested of one end face of second level coupler seal to be coupled and form second level sound source coupling cavity;
Wherein, the microphone array element in microphone array to be tested is placed on the position about sound source axisymmetrical in the sound source coupling cavity of the described second level;
The acoustical signal that described sound source device sends, first through described first order sound source coupling cavity, then is passed to the microphone array element in microphone array to be tested through described second level sound source coupling cavity.
4. the device according to Claims 2 or 3, is characterized in that, the shape of the shape of the coupler be coupled with described sound source device sealing and the shell of described sound source device is suitable.
5. the device according to any one of claim 1-3, is characterized in that, this device comprises further: pressure apparatus;
Described pressure apparatus, contacts with microphone array to be tested, and for applying pressure to described microphone array to be tested, to strengthen being coupled of microphone array to be tested and coupler.
6. a microphone method of testing, is characterized in that, this method of testing comprises:
At least one grade coupled device is utilized to be coupled microphone array to be tested and sound source device, form sound source coupling cavity, wherein, by coupler, the microphone array element in described microphone array to be tested is divided into groups, make the position of the microphone array element in each group all about sound source axisymmetrical;
Control described sound source device by testing software and send acoustical signal, make this acoustical signal be passed to microphone array to be tested through described sound source coupling cavity;
Gather and analyze the acoustical signal that in microphone array to be tested, each array element receives, obtaining test result.
7. method according to claim 6, is characterized in that, described be coupled microphone array to be tested and the sound source device of at least one grade coupled device that utilize comprises:
One end face of coupler is sealed with microphone array to be tested and is coupled, the subtend end face of one end face is coupled with described sound source device sealing, form sound source coupling cavity, the acoustical signal that described sound source device is sent and microphone array to be tested are coupling in this sound source coupling cavity.
8. method according to claim 6, is characterized in that, described be coupled microphone array to be tested and the sound source device of at least one grade coupled device that utilize also comprises:
Utilize first order coupler and second level coupler; And an end face of described first order coupler is coupled with described sound source device sealing, the subtend end face of an end face of first order coupler and an end coupling of second level coupler, form first order sound source coupling cavity;
The subtend end face of one end face of second level coupler and microphone array to be tested are sealed to be coupled and forms second level sound source coupling cavity;
Wherein, the microphone array element in microphone array to be tested is placed on the position about sound source axisymmetrical in the sound source coupling cavity of the described second level;
Control the acoustical signal that described sound source device sends, first through described first order sound source coupling cavity, then be passed to the microphone array element in microphone array to be tested through described second level sound source coupling cavity.
9. the method according to claim 7 or 8, is characterized in that, the method comprises:
According to the shape of the profile design coupler of sound source device, make the shape of coupler form and described sound source device suitable.
10. method according to claim 9, it is characterized in that, the method comprises further: utilize pressure apparatus to contact with microphone array to be tested, and applies pressure to described microphone array to be tested, to strengthen being coupled of microphone array to be tested and coupler.
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| CN106921928A (en) * | 2017-04-06 | 2017-07-04 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Measurement, calibration method and device to microphone |
| CN108769886A (en) * | 2018-06-25 | 2018-11-06 | 歌尔股份有限公司 | A kind of microphone test equipment |
| CN108769886B (en) * | 2018-06-25 | 2020-10-09 | 歌尔股份有限公司 | Microphone test equipment |
| CN109640216A (en) * | 2018-12-19 | 2019-04-16 | 珠海市精实测控技术有限公司 | A kind of novel acoustic sound proof box |
| CN111050268A (en) * | 2020-01-16 | 2020-04-21 | 苏州思必驰信息科技有限公司 | Phase testing system, method, device, equipment and medium of microphone array |
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