CN107360528A - A kind of calibration method and device based on microphone array - Google Patents
A kind of calibration method and device based on microphone array Download PDFInfo
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- CN107360528A CN107360528A CN201710423032.6A CN201710423032A CN107360528A CN 107360528 A CN107360528 A CN 107360528A CN 201710423032 A CN201710423032 A CN 201710423032A CN 107360528 A CN107360528 A CN 107360528A
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- microphone
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- calibration method
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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
- H04R29/005—Microphone arrays
Abstract
The invention discloses a kind of calibration method and device based on microphone array, the calibration method includes：By the sensitivity adjustment of first microphone to target sensitivity；The sensibility in practice of first microphone is detected, as reference sensitivity；By the sensitivity adjustment of second microphone to reference sensitivity.By the calibration method of embodiment, the degree of accuracy of microphone array calibration can be improved, can reduce or eliminate microphone attachment caused error, and the difference between the sensitivity of each microphone substantially reduces on circuit boards.
Description
Technical field
The present invention relates to Microphone calibration technical field, more particularly it relates to a kind of based on microphone array
Calibration method and device.
Background technology
Current automobile and other consumer peripheral products to the matching requests of all microphones in microphone array increasingly
The pairing of height, especially sensitivity, higher performance is reached and has realized Multi-applications Integration, the pairing of its medium sensitivity refers to spirit
Difference between sensitivity is less than setting difference.
In the prior art, the sensitivity typically to single microphone is calibrated, then the microphone after calibration is pasted
Fill on circuit boards, to obtain microphone array.
But after the microphone after calibration is mounted on circuit boards, due to the stress between microphone and circuit board
Effect, the sensitivity for causing microphone is produced into deviation.Moreover, when portions of client shows different spirits to different microphone array
, need to be to microphone stepping during sensitivity difference requirements.Microphone stepping be specially every microphone is calibrated and then from
In pick out the microphone combination that sensitivity difference meets respective standard.Existing stepping mode workload is big, it is less efficient and
Cost is higher, and repeatedly test can cause the sensitivity error of microphone to accumulate increase.
The content of the invention
It is an object of the present invention to provide a kind of new solution that can solve the problem that one of above mentioned problem.
According to the first aspect of the invention, there is provided a kind of calibration method based on microphone array, the microphone array
Row include at least two microphones, and the calibration method includes：
By the sensitivity adjustment of first microphone to target sensitivity；
The sensibility in practice of first microphone is detected, as reference sensitivity；
By the sensitivity adjustment of second microphone to the reference sensitivity.
Optionally, the calibration method also includes：
Detect the sensibility in practice of second microphone；
Calculate the tolerance between the sensibility in practice of two microphones；
Judge the tolerance whether in the setting margin of tolerance.
Optionally, the sensitivity adjustment by first microphone to target sensitivity includes：
Detect the first initial sensitivity of first microphone；
The difference between first initial sensitivity and the target sensitivity is calculated, as the first difference；
The gain of the bias voltage and/or amplifier of first microphone according to first discrepancy adjustment, will
The sensitivity adjustment of first microphone is to the target sensitivity.
Optionally, the sensitivity adjustment by second microphone to the reference sensitivity includes：
Detect the second initial sensitivity of second microphone；
The difference between second initial sensitivity and the reference sensitivity is calculated, as the second difference；
The gain of the bias voltage and/or amplifier of second microphone according to second discrepancy adjustment, will
The sensitivity adjustment of second microphone is to the reference sensitivity.
According to the second aspect of the invention, there is provided a kind of calibrating installation of microphone array, the microphone array bag
At least two microphones are included, the calibrating installation includes：
First adjusting module, for by the sensitivity adjustment of first microphone to target sensitivity；
First detection module, for detecting the sensibility in practice of first microphone, as reference sensitivity；
Second adjusting module, for by the sensitivity adjustment of second microphone to the reference sensitivity.
Optionally, the calibrating installation also includes：
Second detection module, for detecting the sensibility in practice of second microphone；
Tolerance computing module, the tolerance between sensibility in practice for calculating two microphones；
Judge module, for judging the tolerance whether in the setting margin of tolerance.
Optionally, first adjusting module includes：
First detection unit, for detecting the first initial sensitivity of first microphone；
First computing unit, for calculating the difference between first initial sensitivity and the target sensitivity, make
For the first difference；
First adjustment unit, for the bias voltage of first microphone according to first discrepancy adjustment and/or
The gain of amplifier, by the sensitivity adjustment of first microphone to the target sensitivity.
Optionally, second adjusting module includes：
Second detection unit, for detecting the second initial sensitivity of second microphone；
Second computing unit, for calculating the difference between second initial sensitivity and the reference sensitivity, make
For the second difference；
Second adjustment unit, for the bias voltage of second microphone according to second discrepancy adjustment and/or
The gain of amplifier, by the sensitivity adjustment of second microphone to the reference sensitivity.
The beneficial effect of the present invention is, by the calibration method of embodiment, can improve microphone array calibration
The degree of accuracy, can reduce or eliminate microphone attachment caused error, and the sensitivity of each microphone on circuit boards
Between difference substantially reduce.
By referring to the drawings to the present invention exemplary embodiment detailed description, further feature of the invention and its
Advantage will be made apparent from.
Brief description of the drawings
It is combined in the description and the accompanying drawing of a part for constitution instruction shows embodiments of the invention, and even
It is used for the principle for explaining the present invention together with its explanation.
Fig. 1 is according to a kind of a kind of flow chart of embodiment of the calibration method based on microphone array of the present invention；
Fig. 2 is according to a kind of flow chart of the another embodiment of the calibration method based on microphone array of the present invention；
Fig. 3 is according to a kind of a kind of square frame principle of implementation structure of the calibrating installation based on microphone array of the present invention
Figure；
Fig. 4 is another square frame principle for implementing structure according to a kind of calibrating installation based on microphone array of the present invention
Figure.
Embodiment
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that：Unless have in addition
Body illustrates that the unlimited system of part and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The scope of invention.
The description only actually at least one exemplary embodiment is illustrative to be never used as to the present invention below
And its application or any restrictions that use.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
In order to solve to be mounted on circuit board again after the sensitivity present in prior art to single microphone is calibrated
On the problem of sensitivity of microphone can be caused to produce deviation, and test multiple to microphone causes Mike during to microphone stepping
The problem of sensitivity error accumulation of wind, the invention provides a kind of calibration method based on microphone array.I.e. first by Mike
Microphone array is obtained after wind attachment on circuit boards, then microphone array is calibrated.Wherein, wrapped in microphone array
Include at least two microphones.
Fig. 1 is the flow chart according to a kind of embodiment of calibration method of the present invention based on microphone array.
According to Fig. 1, the calibration method comprises the following steps：
Step S110, by the sensitivity adjustment of first microphone to target sensitivity.
Wherein, target sensitivity is determined according to customer demand.
Specifically, the step of performing step S110 can include steps S111~S113.
Step S111, detect the first initial sensitivity of first microphone.
First initial sensitivity is specially sensitivity of first microphone before sensitivity is not adjusted.
Step S112, calculate the difference between the first initial sensitivity and target sensitivity.
Step S113, according to the gain of the bias voltage and/or amplifier of first microphone of the discrepancy adjustment, by
One initial sensitivity is adjusted to target sensitivity.
For example, the first initial sensitivity is -43dB, target sensitivity is -42dB, and it is 1dB to have the first difference, and this difference
The gain of the amplifier of first microphone can be controlled to realize, can be that the gain for making amplifier increases 1dB specifically.
Step S120, the sensibility in practice of first microphone is detected, as reference sensitivity.
Exist due to having error between the actual value and arranges value of the sensitivity of microphone, i.e. sensibility in practice and target
Sensitivity may be unequal, therefore, need to detect the sensibility in practice of the first microphone.
For example, target sensitivity is -42dB, the sensibility in practice for detecting first microphone can be -41.8dB.
Step S130, by the sensitivity adjustment of second microphone to reference sensitivity.
For example, it may be the desired value of the sensitivity of second microphone is adjusted to -41.8dB.
Further, the step of performing step S130 can include steps S131~S133.
Step S131, detect the second initial sensitivity of second microphone.
Specifically, step S111 and step S131 can be performed simultaneously, to save prover time, accelerate to calibrate
Journey.
Step S132, the difference between the second initial sensitivity and reference sensitivity is calculated, as the second difference.
Step S133, will according to the gain of the bias voltage and/or amplifier of second microphone of the second discrepancy adjustment
The sensitivity adjustment of second microphone is to reference sensitivity.
So, by the calibration method of embodiment, the degree of accuracy of microphone array calibration can be improved, can reduce or
Eliminate microphone attachment caused error, and the difference between the sensitivity of each microphone substantially reduces on circuit boards.
In one particular embodiment of the present invention, the calibration method also includes step S210~S230 as shown in Figure 2.
Step S210, detect the sensibility in practice of second microphone.
Step S220, calculate the tolerance between the sensibility in practice of two microphones.
Step S230, judge that the tolerance whether in the setting margin of tolerance, in this way, then performs step S241, judging should
Microphone array is qualified；If not, performing step S242, judge that the microphone array is unqualified.
Specifically, tolerance between the sensibility in practice of two microphones is in the setting margin of tolerance, then illustrate this two
Individual microphone meets matching request.
In another specific embodiment of the present invention, the microphone array also includes the 3rd microphone, to the 3rd
The calibration method of microphone is identical with the calibration method of second microphone, i.e., by the sensitivity adjustment of the 3rd microphone to base
Quasi- sensitivity.
On this basis, the sensibility in practice of each microphone need to be detected, and calculates the actual spirit of any two microphone
The tolerance of sensitivity, judges whether all tolerances are in setting in the margin of tolerance, in this way, then judges that the microphone array is qualified；
If not, judge that the microphone array is unqualified.
The calibration method of each embodiment in itself, does not have an impact for microphone to other components on circuit board,
Meanwhile also other components on obstructed oversampling circuit plate realize calibration.
The calibration of microphone is realized in circuit board platform, microphone can be excluded in attachment process and test process early stage
The error and process of middle appearance influence, and microphone obtains ultimate sensitivity, therefore sensitivity after the completion of calibrating on circuit boards
The degree of accuracy it is higher, controllable tolerance is smaller.
Pass through the calibration method of embodiment, it is possible to reduce the workload of microphone stepping, improve the efficiency of stepping, improve wheat
The qualification rate of gram wind array, but also the cost of stepping can be reduced.Meanwhile by the calibration method of the present embodiment, it can make
After stepping each microphone of microphone array the sensitivity degree of accuracy it is higher, the sensitivity difference between each microphone is smaller.
Corresponding with the above method, present invention also offers a kind of calibrating installation based on microphone array.The Mike
Wind array includes at least two microphones.Fig. 3 is to implement knot according to a kind of of calibrating installation of the present invention based on microphone array
The frame principle figure of structure.
According to Fig. 3, the calibrating installation includes the first adjusting module 310, first detection module 320 and second adjusts mould
Block 330.
Above-mentioned first adjusting module 310 is used for the sensitivity adjustment of first microphone to target sensitivity.
As shown in figure 4, first adjusting module 310 may further include the first detection unit 311, the first computing unit
312 and first adjustment unit 313, first detection unit 311 be used for the first initial sensitivity for detecting first microphone；Should
First computing unit 312 is used to calculate the difference between the first initial sensitivity and target sensitivity, as the first difference；This
One adjustment unit 313 is used for the gain of the bias voltage and/or amplifier according to first microphone of the first discrepancy adjustment, will
The sensitivity adjustment of first microphone is to target sensitivity.
Above-mentioned first detection module 320 is used for the sensibility in practice for detecting first microphone, as reference sensitivity.
Above-mentioned second adjusting module 330 is used for the sensitivity adjustment of second microphone to reference sensitivity.
As shown in figure 4, second adjusting module 330 may further include the second detection unit 331, the second computing unit
332 and second adjustment unit 333, second detection unit 331 be used for the second initial sensitivity for detecting second microphone；Should
Second computing unit 332 is used to calculate the difference between the second initial sensitivity and reference sensitivity, as the second difference；This
Two adjustment units 333 are used for the gain of the bias voltage and/or amplifier according to second microphone of the second discrepancy adjustment, will
The sensitivity adjustment of second microphone is to reference sensitivity.
In one particular embodiment of the present invention, as shown in figure 4, the calibrating installation can also include the second detection module
410th, tolerance computing module 420 and judge module 430.Second detection module 410 is used for the reality for detecting second microphone
Sensitivity；The tolerance computing module 420 is used to calculate the tolerance between the sensibility in practice of two microphones；The judge module
Whether 430 be used to judge tolerance in the setting margin of tolerance.
So, by the calibrating installation of embodiment, the degree of accuracy of microphone array calibration can be improved, can reduce or
Eliminate microphone attachment caused error, and the difference between the sensitivity of each microphone is smaller on circuit boards, i.e., each wheat
The pairing of gram wind is more accurate.
The various embodiments described above primary focus describes the difference with other embodiment, but those skilled in the art should be clear
Chu, the various embodiments described above can be used alone or be combined with each other as needed.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Point cross-reference, what each embodiment stressed is the difference with other embodiment, but people in the art
Member is it should be understood that the various embodiments described above can be used alone or be combined with each other as needed.In addition, for device
For embodiment, because it is corresponding with embodiment of the method, so describing fairly simple, related part is implemented referring to method
The explanation of the corresponding part of example.System embodiment described above is only schematical, wherein as separating component
The module of explanation can be or may not be physically separate.
The present invention can be device, method and/or computer program product.Computer program product can include computer
Readable storage medium storing program for executing, containing for making processor realize the computer-readable program instructions of various aspects of the invention.
Computer-readable recording medium can keep and store to perform the tangible of the instruction that uses of equipment by instruction
Equipment.Computer-readable recording medium for example can be-- but be not limited to-- storage device electric, magnetic storage apparatus, optical storage
Equipment, electromagnetism storage device, semiconductor memory apparatus or above-mentioned any appropriate combination.Computer-readable recording medium
More specifically example (non exhaustive list) includes：Portable computer diskette, hard disk, random access memory (RAM), read-only deposit
It is reservoir (ROM), erasable programmable read only memory (EPROM or flash memory), static RAM (SRAM), portable
Compact disk read-only storage (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanical coding equipment, for example thereon
It is stored with punch card or groove internal projection structure and the above-mentioned any appropriate combination of instruction.Calculating used herein above
Machine readable storage medium storing program for executing is not construed as instantaneous signal in itself, the electromagnetic wave of such as radio wave or other Free propagations, leads to
Cross the electromagnetic wave (for example, the light pulse for passing through fiber optic cables) of waveguide or the propagation of other transmission mediums or transmitted by electric wire
Electric signal.
Computer-readable program instructions as described herein can be downloaded to from computer-readable recording medium it is each calculate/
Processing equipment, or outer computer or outer is downloaded to by network, such as internet, LAN, wide area network and/or wireless network
Portion's storage device.Network can include copper transmission cable, optical fiber is transmitted, is wirelessly transferred, router, fire wall, interchanger, gateway
Computer and/or Edge Server.Adapter or network interface in each calculating/processing equipment receive from network to be counted
Calculation machine readable program instructions, and the computer-readable program instructions are forwarded, for the meter being stored in each calculating/processing equipment
In calculation machine readable storage medium storing program for executing.
For perform the computer program instructions that operate of the present invention can be assembly instruction, instruction set architecture (ISA) instruction,
Machine instruction, machine-dependent instructions, microcode, firmware instructions, condition setup data or with one or more programming languages
The source code or object code that any combination is write, programming language of the programming language including object-oriented-such as
Smalltalk, C++ etc., and conventional procedural programming languages-such as " C " language or similar programming language.Computer
Readable program instructions fully can on the user computer perform, partly perform on the user computer, be only as one
Vertical software kit performs, part performs or completely in remote computer on the remote computer on the user computer for part
Or performed on server.In the situation of remote computer is related to, remote computer can pass through network-bag of any kind
LAN (LAN) or wide area network (WAN)-be connected to subscriber computer are included, or, it may be connected to outer computer (such as profit
Pass through Internet connection with ISP).In certain embodiments, by using computer-readable program instructions
Status information carry out personalized customization electronic circuit, such as PLD, field programmable gate array (FPGA) or can
Programmed logic array (PLA) (PLA), the electronic circuit can perform computer-readable program instructions, so as to realize each side of the present invention
Face.
Referring herein to method, apparatus (system) and computer program product according to embodiments of the present invention flow chart and/
Or block diagram describes various aspects of the invention.It should be appreciated that each square frame and flow chart of flow chart and/or block diagram and/
Or in block diagram each square frame combination, can be realized by computer-readable program instructions.
These computer-readable program instructions can be supplied to all-purpose computer, special-purpose computer or other programmable datas
The processor of processing unit, so as to produce a kind of machine so that these instructions are passing through computer or other programmable datas
During the computing device of processing unit, work(specified in one or more of implementation process figure and/or block diagram square frame is generated
The device of energy/action.These computer-readable program instructions can also be stored in a computer-readable storage medium, these refer to
Order causes computer, programmable data processing unit and/or other equipment to work in a specific way, so as to be stored with instruction
Computer-readable medium then includes a manufacture, and it is included in one or more of implementation process figure and/or block diagram square frame
The instruction of the various aspects of defined function/action.
Computer-readable program instructions can also be loaded into computer, other programmable data processing units or other
In equipment so that series of operation steps is performed on computer, other programmable data processing units or miscellaneous equipment, with production
Raw computer implemented process, so that performed on computer, other programmable data processing units or miscellaneous equipment
Instruct function/action specified in one or more of implementation process figure and/or block diagram square frame.
Flow chart and block diagram in accompanying drawing show system, method and the computer journey of multiple embodiments according to the present invention
Architectural framework in the cards, function and the operation of sequence product.At this point, each square frame in flow chart or block diagram can generation
One module of table, program segment or a part for instruction, the module, program segment or a part for instruction include one or more use
In the executable instruction of logic function as defined in realization.At some as the function of in the realization replaced, being marked in square frame
Can be with different from the order marked in accompanying drawing generation.For example, two continuous square frames can essentially be held substantially in parallel
OK, they can also be performed in the opposite order sometimes, and this is depending on involved function.It is also noted that block diagram and/or
The combination of each square frame and block diagram in flow chart and/or the square frame in flow chart, function or dynamic as defined in performing can be used
The special hardware based system made is realized, or can be realized with the combination of specialized hardware and computer instruction.It is right
It is well known that, realized for those skilled in the art by hardware mode, realized by software mode and by software and
It is all of equal value that the mode of combination of hardware, which is realized,.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
The principle of each embodiment, practical application or technological improvement to the technology in market are best being explained, or is leading this technology
Other those of ordinary skill in domain are understood that each embodiment disclosed herein.The scope of the present invention is limited by appended claims
It is fixed.
Claims (8)
1. a kind of calibration method based on microphone array, it is characterised in that the microphone array includes at least two Mikes
Wind, the calibration method include：
By the sensitivity adjustment of first microphone to target sensitivity；
The sensibility in practice of first microphone is detected, as reference sensitivity；
By the sensitivity adjustment of second microphone to the reference sensitivity.
2. calibration method according to claim 1, it is characterised in that the calibration method also includes：
Detect the sensibility in practice of second microphone；
Calculate the tolerance between the sensibility in practice of two microphones；
Judge the tolerance whether in the setting margin of tolerance.
3. calibration method according to claim 1, it is characterised in that the sensitivity adjustment by first microphone is extremely
Target sensitivity includes：
Detect the first initial sensitivity of first microphone；
The difference between first initial sensitivity and the target sensitivity is calculated, as the first difference；
The gain of the bias voltage and/or amplifier of first microphone according to first discrepancy adjustment, by described in
The sensitivity adjustment of first microphone is to the target sensitivity.
4. calibration method according to claim 1, it is characterised in that the sensitivity adjustment by second microphone is extremely
The reference sensitivity includes：
Detect the second initial sensitivity of second microphone；
The difference between second initial sensitivity and the reference sensitivity is calculated, as the second difference；
The gain of the bias voltage and/or amplifier of second microphone according to second discrepancy adjustment, by described in
The sensitivity adjustment of second microphone is to the reference sensitivity.
5. a kind of calibrating installation based on microphone array, it is characterised in that the microphone array includes at least two Mikes
Wind, the calibrating installation include：
First adjusting module, for by the sensitivity adjustment of first microphone to target sensitivity；
First detection module, for detecting the sensibility in practice of first microphone, as reference sensitivity；
Second adjusting module, for by the sensitivity adjustment of second microphone to the reference sensitivity.
6. calibrating installation according to claim 5, it is characterised in that the calibrating installation also includes：
Second detection module, for detecting the sensibility in practice of second microphone；
Tolerance computing module, the tolerance between sensibility in practice for calculating two microphones；
Judge module, for judging the tolerance whether in the setting margin of tolerance.
7. calibrating installation according to claim 5, it is characterised in that first adjusting module includes：
First detection unit, for detecting the first initial sensitivity of first microphone；
First computing unit, for calculating the difference between first initial sensitivity and the target sensitivity, as
One difference；
First adjustment unit, for the bias voltage of first microphone and/or amplification according to first discrepancy adjustment
The gain of device, by the sensitivity adjustment of first microphone to the target sensitivity.
8. calibrating installation according to claim 5, it is characterised in that second adjusting module includes：
Second detection unit, for detecting the second initial sensitivity of second microphone；
Second computing unit, for calculating the difference between second initial sensitivity and the reference sensitivity, as
Two differences；
Second adjustment unit, for the bias voltage of second microphone and/or amplification according to second discrepancy adjustment
The gain of device, by the sensitivity adjustment of second microphone to the reference sensitivity.
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| CN111510843B (en) * | 2020-05-12 | 2021-11-23 | 无锡韦感半导体有限公司 | Trimming device and trimming method of MEMS microphone |
| CN114449434A (en) * | 2022-04-07 | 2022-05-06 | 荣耀终端有限公司 | Microphone calibration method and electronic equipment |
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