CN105578375B - A kind of microphone test device and test method - Google Patents
A kind of microphone test device and test method Download PDFInfo
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- CN105578375B CN105578375B CN201511030737.9A CN201511030737A CN105578375B CN 105578375 B CN105578375 B CN 105578375B CN 201511030737 A CN201511030737 A CN 201511030737A CN 105578375 B CN105578375 B CN 105578375B
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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 kind of microphone test device and test method, which includes: sound source device and at least one level coupler；At least one level coupler forms sound source coupler for coupling sound source device and microphone array to be tested；Wherein, the microphone array element in the microphone array to be tested is grouped by coupler, so that the microphone array element in each group is all about sound source axisymmetrical；The acoustical signal that sound source device issues, is transferred to microphone to be tested by sound source coupler.The technical solution of the embodiment of the present invention can be realized accurately and reliably to array element frequency response, distortion in microphone array product, the test of phase difference especially between array element, and it is reproducible, it is simple to operate, space is not take up to be conducive to be integrated into automatic test, the efficiency of production is improved, production cost is saved.
Description
Technical field
The present invention relates to microphone the field of test technology, and in particular to a kind of microphone test device and test method.
Background technique
Phase difference with the extensive use of microphone array product, between the frequency response of each array element, distortion and array element
More and more attention has been paid to.We can by calculate the phase difference in microphone array between array element come sound source azimuth information,
But we need to guarantee first the original phase difference in array product between each array element be it is known, this is just needed accurately and reliably
Measurement scheme complete the test of phase difference especially between array element to array element frequency response in microphone array product, distortion.
The test method of existing microphone array product is mostly free field test, to be obtained than more actually free field ring
Border needs to build the at high cost of anechoic chamber, and maintenance cost is higher using biggish anechoic chamber.Usually make in the production line
Use the sound attenuator of miniaturization as the compromise of performance and price, but the sound attenuator minimized does not have sound-absorbing effect to low-frequency sound,
The low frequency performance that product to be measured can not accurately be detected influences the acoustical behavior of product, and still can occupy more production
Space is unfavorable for automatic production line arrangement.
It follows that do not complete accurately and reliably in the prior art to array element frequency response in microphone array product,
Distortion, the scheme that especially phase difference is tested between array element.
Summary of the invention
The present invention provides a kind of microphone test device and test methods, to solve in the prior art without accurate and reliable
Completion to array element frequency response in microphone array product, distortion, especially between array element the problem of the test of phase difference.
According to an aspect of the invention, there is provided a kind of microphone test device, the device include: sound source device and
At least one level coupler；
At least one level coupler forms sound source coupler for coupling sound source device and microphone array to be tested；Pass through
Microphone array element in the microphone array to be tested is grouped by coupler, so that the microphone array element in each group
Position is all about sound source axisymmetrical；
The acoustical signal that the sound source device issues, is transferred to microphone to be tested by the sound source coupler.
Optionally, when the series of the coupler is level-one, an end face of the coupler and microphone array to be tested are close
Envelope coupling, the opposite end face of an end face are coupled with the sound source device sealing, sound source coupler are formed, so that the sound source device
The acoustical signal and microphone array to be tested that part issues are coupled in the sound source coupler.
Optionally, when the series of the coupler is two-stage,
One end face of first order coupler is coupled with the sound source device sealing, the opposite direction of an end face of first order coupler
One end coupling of end face and second level coupler forms first order sound source coupler；
The opposite end face of one end face of second level coupler and microphone array sealed coupling to be tested form second level sound
Source coupler；
Wherein, the microphone array element in microphone array to be tested is placed in the second level sound source coupler about sound
The position of source axisymmetrical；
The acoustical signal that the sound source device issues, first passes through the first order sound source coupler, using the second level
Sound source coupler is transferred to the microphone array element in microphone array to be tested.
Optionally, the shape of the shell of the shape of the coupler coupled with the sound source device sealing and the sound source device
It is adapted.
The device further comprises: pressure apparatus；
Pressure apparatus is contacted with microphone array to be tested, and for applying pressure to microphone array to be tested, to increase
The coupling of strong microphone array and coupler to be tested.
According to another aspect of the present invention, a kind of microphone test method is provided, which includes:
Microphone array and sound source device to be tested are coupled using at least one level coupler, forms sound source coupler, wherein
The microphone array element in the microphone array to be tested is grouped by coupler, so that the microphone array in each group
Member is all about sound source axisymmetrical；
The sound source device is controlled by test software and issues acoustical signal, so that the acoustical signal passes through the sound source coupler
It is transferred to microphone array to be tested；
The acoustical signal that each array element receives in microphone array to be tested is acquired and analyzed, test result is obtained.
Optionally, described to include: using at least one level coupler coupling microphone array to be tested and sound source device
By an end face of coupler and microphone array sealed coupling to be tested, by the opposite end face of an end face and the sound
The coupling of source device sealing, forms sound source coupler, so that the acoustical signal of sound source device sending and microphone array to be tested
Column are coupled in the sound source coupler.
Optionally, microphone array and sound source device to be tested are coupled using at least one level coupler further include:
It is described to couple microphone array and sound source device to be tested using at least one level coupler further include:
Utilize first order coupler and second level coupler；And by an end face of the first order coupler and the sound source
Device sealing coupling, an end coupling of the opposite end face of an end face of first order coupler and second level coupler form the
Level-one sound source coupler；
The opposite end face of one end face of second level coupler and microphone array sealed coupling to be tested are formed into the second level
Sound source coupler；
Wherein, by the microphone array element in microphone array to be tested be placed in the second level sound source coupler about
The position of sound source axisymmetrical；
The acoustical signal that the sound source device issues is controlled, the first order sound source coupler is first passed through, using described the
Second level sound source coupler is transferred to the microphone array element in microphone array to be tested.
Optionally, this method comprises:
The shape that coupler is designed according to the shape of sound source device, so that the shape of coupler form and the sound source device
It is adapted.
Optionally, this method further comprises: contacted using pressure apparatus with microphone array to be tested, and to it is described to
It tests microphone array and applies pressure, to enhance the coupling of microphone array and coupler to be tested.
The beneficial effects of the present invention are: the present invention provides a kind of microphone test device, the microphone test device packet
At least one level coupler is included, which is coupled in sound source and microphone to be tested in the independent rigid operatic tunes, forms pressure
Field test environment.Utilize the frequency response and distortion that microphone array element to be measured the characteristics of acoustic pressure isotropism, is detected in pressure chamber；
By the way that microphone to be tested to be placed in pressure chamber about the symmetrical position of sound source, sound source is controlled to each microphone array to be measured
The acoustic path of member is consistent, and phase difference can really reflect the difference between array element between the microphone array element that guarantee test obtains
It is different, realize the phase difference between the frequency response, distortion and array element of accurate test microphone array element.Also, this Mike of the invention
Wind test device occupies little space, is conducive to automatic production line arrangement, easy to operate, testing efficiency is high.The present invention also provides
A kind of test method using the microphone test device, the test method is due to testing dress using the microphone of the present embodiment
It sets, thus also there is reproducible, raising testing efficiency height, save the effect of production cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the microphone test device of one embodiment of the invention；
Fig. 2 a is the structural schematic diagram before the microphone test device assembling of another embodiment of the present invention；
Fig. 2 b is the structural schematic diagram after the microphone test device assembling of another embodiment of the present invention；
Fig. 3 a is the structural schematic diagram before the assembling of the microphone test device of another embodiment of the invention；
Fig. 3 b is the structural schematic diagram after the assembling of the microphone test device of another embodiment of the invention；
Fig. 4 is the flow diagram of the microphone test method of one embodiment of the invention.
Specific embodiment
Core of the invention thought is: utilizing the feature that pressure field test frequency response stability is good, signal-to-noise ratio is high, design
A kind of coupler being able to carry out pressure field test forms sound source coupler for coupling microphone to be tested and sound source device.
And by designing microphone to be tested in pressure chamber about sound source axisymmetrical, it can control sound source to each Mike to be measured
The acoustic path of wind array element is consistent, and phase difference can really reflect between array element between guaranteeing the microphone array element that test obtains
Difference, to accurately test the phase difference between the frequency response, distortion and array element of microphone array element.
Embodiment one
Fig. 1 is the structural schematic diagram of the microphone test device of one embodiment of the invention, and referring to Fig. 1, which is surveyed
It includes: sound source device 11 and at least one level coupler 10 that trial assembly, which is set,；
At least one level coupler 10 forms sound source coupler 13 for coupling sound source device 11 and microphone to be tested 12；
Wherein, microphone 12 to be tested is placed in sound source coupler 13 about the symmetrical position sound source axis (i.e. in Fig. 1 shown in dotted line)
It sets；
The acoustical signal that sound source device 11 issues, is transferred to microphone 12 to be tested by sound source coupler 13.
As shown in Figure 1, the series of coupler 10 is level-one, an end face of the coupler 10 and microphone 12 to be tested are sealed
Coupling, the opposite end face of an end face and 11 sealed coupling of sound source device, form sound source coupler 13, so that sound source device 11 is sent out
Acoustical signal and microphone to be tested 12 out is coupled in the sound source coupler 13.
Here sound source device 11 includes: sound source shell and electroacoustic transducer 110；Sound source device 11 further includes function in Fig. 1
Rate amplifier 111, power amplifier 111 may be mounted in sound source shell, be also possible to external.
When actual test, the widely applied artificial mouth product of the prior art is can be used in sound source device 11, and selects
One high performance loudspeaker (loudspeaker) is used as electro-acoustic transducing device 110, can also in extremely low power application scenarios
To use receiver (receiver) as electro-acoustic transducing device 110.It can according to need and selected in practical application, to this
With no restriction.
The course of work of test device shown in FIG. 1 are as follows: carry out microphone test, test software using Fig. 1 test device
Sound source of feeding device detection electric signal, sound source device issue acoustical signal, formed inside sound source coupler one it is stable it is each to
The pressure field acoustical signal of the same sex, acoustical signal are transmitted at each microphone to be tested to be measured, each microphone acquisition to be tested
To after voice signal, test computer is passed to, obtains recording file, the analysis available each microphone array element of recording file
Phase information between frequency response, distortion and array element.
It should be noted that this microphone test device of the present embodiment both can be used to test microphone array can also
To be used to test microphone monomer, to this and with no restrictions.As long as microphone to be tested is placed on about sound source axisymmetrical
Position.For example, the microphone monomer to be placed on to the position of sound source axis face when test microphone monomer.
Embodiment two
Fig. 2 a is the structural schematic diagram before the microphone test device assembling of another embodiment of the present invention, and Fig. 2 b is this hair
Structural schematic diagram after the microphone test device assembling of another bright embodiment, below in conjunction with Fig. 2 a and Fig. 2 b to the present invention one
This microphone test device of a embodiment is specifically described.
A and Fig. 2 b referring to fig. 2, shows level-one coupler 20, sound source device 22 and comprising four microphone array elements (see
MIC1&2 shown in Fig. 2 b, MIC3&4) microphone array to be tested 21.Four microphone array elements in microphone array 21
It is all not symmetrical between (MIC1&2, MIC3&4) and sound source axis (dotted line in b referring to fig. 2).It will be to be measured by coupler 20
Examination microphone array 21 in microphone array element be grouped so that the position of the microphone array element in each group all meet about
The condition of sound source axisymmetrical.
In the present embodiment, by coupler 20 microphone array element be grouped, each group of microphone array element be all located at about
The position of sound source axisymmetrical.In this way during actual test, the combination of adjustable coupler 20 and sound source device 22.Specifically
, as shown in Figure 2 b, first group of array element (MIC1&2) is first tested, the sound source device 22 that then moves right again tests second group of array element
(MIC3&4), each group is tested respectively, to obtain frequency response, distortion and the array element of each microphone array element in each group
Between phase information.
B referring to fig. 2, this microphone test device of the present embodiment further include: pressure apparatus 23, with microphone to be tested
(i.e. microphone array 21) contact, and apply pressure to microphone array 21, to enhance microphone array 21 and coupler 20
Coupling, it is ensured that the leakproofness of test device improves the accuracy of test result.
B referring to fig. 2, sound source device 22 include: sound source shell and electroacoustic transducer.In the present embodiment, with sound source device 22
The shape of the coupler 20 of sealed coupling is adapted with the shell of also sound source device 22, in actual application, coupler 20
Contoured design is carried out according to the shape for testing used sound source device 22 (such as artificial mouth), it is therefore an objective to realize coupler 20 and sound source
The sealed coupling of device 22.In addition, the shape of coupler 20 is adapted with the shape of microphone array 21, realize coupler 20 with
Microphone array product 21 carries out acoustic seal coupling.
It should be noted that this microphone test device of the present embodiment both can be used to test microphone array can also
To be used to test microphone monomer, to this and with no restrictions, as long as microphone to be tested is placed on about sound source axisymmetrical
Position.
Embodiment three
Fig. 3 a is the structural schematic diagram before the assembling of the microphone test device of another embodiment of the invention, and Fig. 3 b is this
Structural schematic diagram after inventing the assembling of the microphone test device of another embodiment.Below in conjunction with Fig. 3 a and Fig. 3 b to comprising
The structure of two-stage coupler is specifically described, and other content is referring to other embodiments of the invention.
Referring to Fig. 3 a and Fig. 3 b, the microphone test device for testing the array product of multiple microphone array elements is illustrated, is led to
Two-stage coupler is crossed to realize that sound source is transmitted to the path of each array element and be consistent, and then accurately tests the frequency of Mike's array element
Response, phase difference between distortion and array element.
When the number of stages of coupler is two-stage in the present embodiment, an end face of first order coupler 30 and sound source device 33 are close
Envelope coupling, the opposite end face of an end face of first order coupler 30 and an end coupling of second level coupler 31, form first
Grade sound source coupler；The opposite end face of one end face of second level coupler 31 and 32 sealed coupling of microphone to be tested form second
Grade sound source coupler；Wherein, the array element of microphone array to be tested is placed in the sound source coupler of the second level about sound source axis
(referring to the dotted line in Fig. 3 b) symmetrical position；
The acoustical signal that sound source device 33 issues, first passes through first order sound source coupler, using second level sound source coupler
It is transferred to microphone 32 to be tested.
In the present embodiment, microphone to be tested is that microphone array 32 includes four microphone array elements (see shown in Fig. 2 b
MIC1&2, MIC3&4), the shape of second level coupler 31 is adapted with the shape of microphone array 32；
The microphone array element in microphone array to be tested is grouped by coupler 31, so that the wheat in each group
The position of gram wind array element all meets the condition about sound source axisymmetrical.
Referring to Fig. 3 b, which further comprises: pressure apparatus 34, pressure apparatus 34 are contacted with microphone to be tested
And for applying pressure to microphone to be tested, to enhance the coupling of microphone and coupler to be tested.
Referring to Fig. 3 b, sound source device 33 includes: sound source shell and electroacoustic transducer.
In addition, shape and sound source device in the present embodiment, with the first order coupler 30 of 33 sealed coupling of sound source device
Shell be adapted, to guarantee the sealed coupling of first order coupler Yu sound source device.
It should be noted that carried out with two-stage coupler coupling sound source device and microphone to be measured in the present embodiment
Exemplary illustration, but it is not limited to this, in other embodiments of the invention, the coupler more than two-stage can be set with into one
Step improves testing efficiency.
Example IV
Fig. 4 is the flow diagram of the microphone test method of one embodiment of the invention, is mainly pair in the present embodiment
The realization step of microphone test method is illustrated, and other content is referring to the other embodiment of the present invention.
Referring to fig. 4, which includes the following steps:
Step S41 couples microphone array and sound source device to be tested using at least one level coupler, forms sound source coupling
Chamber, wherein be grouped the microphone array element in the microphone array to be tested by coupler, so that in each group
Microphone array element is all about sound source axisymmetrical；
Step S42 controls sound source device by test software and issues acoustical signal, so that the acoustical signal passes through sound source coupler
It is transferred to microphone array to be tested；
Step S43 acquires and analyzes the acoustical signal that each array element receives in microphone array to be tested, obtains test knot
Fruit.
In one embodiment of the invention, microphone and sound source device packet to be tested are coupled using at least one level coupler
It includes:
It is by an end face of coupler and microphone sealed coupling to be tested, the opposite end face of an end face and sound source device is close
Envelope coupling, forms sound source coupler, so that acoustical signal and microphone to be tested that sound source device issues are coupled in the sound source coupling
It closes intracavitary.
In another embodiment of the present invention, microphone and sound source device to be tested are coupled using at least one level coupler
Include:
Utilize first order coupler and second level coupler；And by an end face of first order coupler and sound source device sealing
Coupling, the opposite end face of an end face of first order coupler and an end coupling of second level coupler, form first order sound source
Coupler；The opposite end face of one end face of second level coupler and microphone sealed coupling to be tested are formed into second level sound source coupling
Close chamber；The microphone array element in the microphone array to be tested is grouped by coupler, so that the wheat in each group
Gram wind array element is all about sound source axisymmetrical；
The acoustical signal that sound source device issues is controlled, first order sound source coupler is first passed through, is coupled using second level sound source
Chamber is transferred to microphone to be tested.
It should be noted that the realization step of this microphone test method in the present embodiment is surveyed with aforementioned microphone
The course of work that trial assembly is set is corresponding, and therefore, the specific implementation step of the microphone test method of the present embodiment may refer to
The related description of the course of work part of aforementioned microphone test device, details are not described herein.
In summary, this microphone test device and test method of the embodiment of the present invention, firstly, using coupler,
Sound source and microphone array are coupled in the independent rigid operatic tunes, form the test environment an of pressure field, and utilize pressure
The characteristics of intracavitary acoustic pressure isotropism, detects the frequency response and distortion of microphone array element to be measured；Secondly, to be tested by designing
For microphone about sound source axisymmetrical in the operatic tunes, the acoustic path for controlling sound source to each microphone array element to be measured is consistent, protects
Phase difference really reflects the difference between array element between the microphone array element that card test obtains, and accurately tests wheat to realize
The effect of phase difference between the frequency response of gram wind array element, distortion and array element.Finally, the technical solution of the embodiment of the present invention is repeatable
Property it is good, it is simple to operate, and occupy little space, be conducive to be integrated into automatic test, save production cost, and if
Multiple coupler test microphone array products are set, testing efficiency can also be further increased.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. a kind of microphone test device, which is characterized in that the device includes: sound source device and at least one level coupler；Sound
Source device includes: sound source shell and electroacoustic transducer；
At least one level coupler forms the sound source coupler of sealing for coupling sound source device and microphone array to be tested；It is logical
Microphone array element in the microphone array to be tested is grouped by overcoupling device, so that the microphone array element in each group
All about sound source axisymmetrical；
The acoustical signal that the sound source device issues, is transferred to microphone to be tested by the sound source coupler；
When the series of the coupler is two-stage, an end face of first order coupler is coupled with the sound source device sealing, and first
The opposite end face of one end face of grade coupler and an end coupling of second level coupler, form first order sound source coupler；The
The opposite end face of one end face of diode coupler and microphone array sealed coupling to be tested form second level sound source coupler；
The acoustical signal that the sound source device issues, first passes through the first order sound source coupler, using the second level sound source
Coupler is transferred to the microphone array element in microphone array to be tested.
2. the apparatus according to claim 1, which is characterized in that the microphone array element in microphone array to be tested is placed on
Position in the second level sound source coupler about sound source axisymmetrical.
3. device according to claim 1 or 2, which is characterized in that the coupler coupled with the sound source device sealing
Shape is adapted with the shape of the sound source shell of the sound source device.
4. the apparatus according to claim 1, which is characterized in that the device further comprises: pressure apparatus；
The pressure apparatus is contacted with microphone array to be tested, and for applying pressure to the microphone array to be tested,
To enhance the coupling of microphone array and coupler to be tested.
5. a kind of microphone test method, which is characterized in that the test method includes:
Microphone array and sound source device to be tested are coupled using at least one level coupler, forms the sound source coupler of sealing,
In, the microphone array element in the microphone array to be tested is grouped by coupler, so that the Mike in each group
The position of wind array element is all about sound source axisymmetrical；Sound source device includes: sound source shell and electroacoustic transducer；
The sound source device is controlled by test software and issues acoustical signal, so that the acoustical signal passes through the sound source coupler, In
Microphone array to be tested is transferred to after forming pressure field acoustical signal in sound source coupler；
The acoustical signal that each array element receives in microphone array to be tested is acquired and analyzed, test result is obtained；
Coupling microphone array and sound source device to be tested using at least one level coupler includes:
When the series of the coupler is two-stage, an end face of first order coupler is coupled with the sound source device sealing, the
The opposite end face of one end face of level-one coupler and an end coupling of second level coupler, form first order sound source coupler；
The opposite end face of one end face of second level coupler is formed second level sound source with microphone array sealed coupling to be tested to couple
Chamber；
The acoustical signal that the sound source device issues is controlled, the first order sound source coupler is first passed through, using the second level
Sound source coupler is transferred to the microphone array element in microphone array to be tested.
6. according to the method described in claim 5, it is characterized in that, the microphone array element in microphone array to be tested is placed
Position in the second level sound source coupler about sound source axisymmetrical.
7. method according to claim 5 or 6, which is characterized in that this method comprises:
The shape that coupler is designed according to the shape of sound source device, so that the sound source shell of coupler form and the sound source device
Shape be adapted.
8. according to the method described in claim 5, it is characterized in that, this method further comprises: using pressure apparatus with it is to be measured
Microphone array contact is tried, and applies pressure to the microphone array to be tested, to enhance microphone array and coupling to be tested
The coupling of clutch.
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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 |
| 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 |
| CN111050268B (en) * | 2020-01-16 | 2021-11-16 | 思必驰科技股份有限公司 | Phase testing system, method, device, equipment and medium of microphone array |
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| CN102769816A (en) * | 2012-07-18 | 2012-11-07 | 歌尔声学股份有限公司 | Device and method for testing noise-reduction earphone |
| 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 |
| CN205491155U (en) * | 2015-12-31 | 2016-08-17 | 歌尔科技有限公司 | Microphone testing arrangement |
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