CN208224476U - A kind of small space sound bearing detection device - Google Patents
A kind of small space sound bearing detection device Download PDFInfo
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- CN208224476U CN208224476U CN201820444165.1U CN201820444165U CN208224476U CN 208224476 U CN208224476 U CN 208224476U CN 201820444165 U CN201820444165 U CN 201820444165U CN 208224476 U CN208224476 U CN 208224476U
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Abstract
The utility model relates to a kind of small space sound bearing detection device, which includes wiring board；It is fixedly installed in assist side and three or three or more MEMS acoustic-electrical transducers of the distribution that is centrosymmetric, the distance between adjacent MEMS acoustic-electrical transducer is not more than the half of sound-source signal minimal wave length；And micro-control unit, every MEMS acoustic-electrical transducer are electrically connected with micro-control unit respectively；The voice signal that micro-control unit is acquired according to three or three or more MEMS acoustic-electrical transducers, obtains the azimuth information of spatial sound source.The utility model additionally provides a kind of spatial sound source orientation detection method.The utility model small space sound bearing detection device has extra small bulk, and can accurately detect the azimuth information of sound source.
Description
Technical field
The utility model relates to speech signal processing technologies, and in particular, to a kind of small space sound bearing spy
Survey device.
Background technique
The earliest realization of acoustics vector sensor derives from submarine sonar application, i.e. vector hydrophone (vector
Hydrophone), the sound issued for passive detection enemy warship, and accurately detect its azimuth-range.Vector hydrophone
Implementation it is very much, early stage most important implementation are as follows: one floats on a liquid to the oscillator of vibration sensing, surrounding
Apply elastic restraint, then outside is rigid protective shell and has porous structure, guarantees that water flow can free in and out.Sound is in a liquid
Propagation be directive longitudinal wave, the vibration of aforementioned suspension oscillator can be caused, the amplitude of vibration is acoustic pressure, and the direction of vibration is
For the direction of sound.The amplitude of aforementioned suspension oscillator vibration and direction are converted to telecommunications by the elastic restraint structure around oscillator
Number, then amplified by circuit and is converted to electric signal.Occur realizing structure similar to the above in air later, but this kind
The shell of structure design not can guarantee air can free vibration so that enforcement difficulty is very in air for this acoustics vector sensor
Greatly, it is not easy to manufacture, not mature MEMS acoustics vector sensor implementation method, and be difficult to minimize.
Really realize the vector sensor technology in air for the first time is the Microflown technology company of Holland, practical new
Microflown sensor, the microflown sensor of type so-called " microfluidic sensor " be by two relatively close to and
200 degrees Celsius of platinum silk is both heated to design, when air will appear after two heating foil metal foil silks it is different
Temperature change analyzes acquisition sound source information and detecting the temperature change.This MEMS acoustics vector sensor has as follows
Disadvantage: preparation process is complicated, and cost is very high；Hz-KHz is lower, can only arrive 10kHz；Two platinum flight leads are close from very,
Its differential principle will greatly enhance low frequency signal, therefore the more sound of low frequency will form strong " interference ".In addition,
Microflown sensor can only measure one-dimensional vector, really to detect Sounnd source direction and need more microflown
sensor.But it uniformly manufactured cannot will increase cost, the technique of microflown sensor itself is just complicated in addition, good
Product rate is low, therefore cost is very high, and one is wanted up to ten thousand Euros or ten tens of thousands of RMB, can be used only in industry or military field.It removes
Except this, because structure is complicated by this kind of microflown sensor, inconvenient Miniaturization Design limits its popularization and application.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts and deficiency provide a kind of small space sound source side
Position detection device, which has extra small bulk, and can accurately detect the azimuth information of sound source.
In order to achieve the above object, the utility model provides a kind of small space sound bearing detection device, described device
Including wiring board；
It is fixed on the wiring board and three or three or more MEMS acoustic-electric transducings of the distribution that is centrosymmetric
Device, the MEMS acoustic-electrical transducer are used to received sound-source signal being converted to electric signal, the adjacent MEMS acoustic-electrical transducer
The distance between be not more than sound-source signal minimal wave length half；
And micro-control unit, each MEMS acoustic-electrical transducer are electrically connected with the micro-control unit respectively；
The sound that the micro-control unit is acquired according to described three or three or more MEMS acoustic-electrical transducer obtains empty
Between sound source azimuth information.
One embodiment according to the present utility model, described three or three or more MEMS acoustic-electrical transducers are identical
Omnidirectional's MEMS acoustic-electrical transducer, and be centrosymmetric and be distributed on the wiring board, the adjacent omnidirectional MEMS acoustic-electric transducing
The distance between device is not more than the half of sound-source signal minimal wave length.
One embodiment according to the present utility model, described three or three or more MEMS acoustic-electrical transducers are to be in together
Three in one plane perhaps three or more MEMS acoustic-electrical transducers and described three or three or more MEMS acoustic-electrical transducers
It is centrosymmetric and is distributed on the wiring board.
One embodiment according to the present utility model, described three or three or more MEMS acoustic-electrical transducers are in not
Four or four or more MEMS acoustic-electrical transducers on coplanar.
One embodiment according to the present utility model, described device further include having in the first shielding of electromagnetic shielding action
Lid, the first shielding upper cover and the wiring board constitute the first electromagnetic shield regions；Described three or three or more MEMS
Acoustic-electrical transducer and micro-control unit are in first electromagnetic shield regions.
One embodiment according to the present utility model, described device further include with electromagnetic shielding action and being located at described the
The secondary shielding upper cover of one shielding upper cover periphery, the secondary shielding upper cover and the wiring board constitute the second electromagnetic shielding area
Domain, first electromagnetic shield regions are in second electromagnetic shield regions, the side setting of the secondary shielding upper cover
There is wire guide.
One embodiment according to the present utility model, the first shielding upper cover and/or secondary shielding upper cover and the line
Ground line on the plate of road is conducted.
One embodiment according to the present utility model is bonded on the wiring board with each MEMS acoustic-electrical transducer
Position is provided with aperture, and the aperture is aligned with the sound inlet of the MEMS acoustic-electrical transducer.
One embodiment according to the present utility model, described device further include wiring board aperture side is arranged in saturating
Sound layer, the sound transparent layer are fixed on the secondary shielding on lid.
One embodiment according to the present utility model, the sound transparent layer are windproof cotton or waterproof sound passing membrane.
One embodiment according to the present utility model, the sound transparent layer are fixed on described by way of buckle or gluing
On secondary shielding on lid.
Another purpose of the utility model also reside in provide it is a kind of according to the utility model small space sound bearing
The spatial sound source orientation detection method of detection device, the described method comprises the following steps:
S1, at least three MEMS acoustic-electrical transducer conducts are selected from three or three or more MEMS acoustic-electrical transducers
The combination of MEMS acoustic-electrical transducer, and selected equiphase point, according to Finite-difference theory building comprising at least two paths of differential signals and
The acoustic vector signal of omnidirectional signal all the way；
S2, data ratio between at least two-way sensor is acquired using at least two paths of differential signals and all the way omnidirectional signal,
Obtain the one-shot measurement result in spatial sound source orientation；
S3, the equiphase point for selecting MEMS acoustic-electrical transducer combination again repeat step S1 and S2, from multiple and different
Equiphase point spatial sound source orientation is taken multiple measurements；
S4, the result repeatedly measured is weighted and averaged, obtains accurate spatial sound source orientation detection result.
One embodiment according to the present utility model in the step S1, preferably constructs two-way according to Finite-difference theory
Differential signal and all the way omnidirectional signal, in the same plane, and its beam pattern is in an angle L for two paths of differential signals, described
Angle L range is [30 °, 150 °].
One embodiment according to the present utility model, the angle L are 90 °.
In the step S1, three tunnels are preferably constructed according to Finite-difference theory for one embodiment according to the present utility model
Differential signal and all the way omnidirectional signal, the three-pass DINSAR signal are in Different Plane, and any differential signal all the way in addition
The angle of plane where two paths of differential signals is not less than 30 ° and is not more than 150 °.
One embodiment according to the present utility model, the three-pass DINSAR signal are mutually orthogonal.
The utility model compared with the existing technology, has the advantages that
(1) the utility model small space sound bearing detection device utilizes multiple MEMS acoustic-electrical transducers and dedicated processes
Chip constructs the extra small sound-conducting apparatus of volume, can not only acquire the sound pressure information of sound field, while can acquire the directionality of sound field
Information, to detect the direction of main sound source in sound field；
(2) the utility model small space sound bearing detection device uses the most mature omnidirectional MEMS acoustic-electric transducing of most standard
Device is built, the MEMS acoustic-electrical transducer preparation process new without additional designs, and cost can accomplish minimum, satisfaction consumption electricity
The demand of son；
(3) the utility model small space sound bearing detection device is in extra small encapsulation volume and multiple MEMS acoustic-electrics
Energy converter so in the case where, solves the problems, such as that differential signal is excessive in the white noise acoustic gain of low-frequency range；Also it solves
The inconsistent bring difference evaluated error problem of frequency response and phase between MEMS acoustic-electrical transducer.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model small space sound bearing detection device；
Fig. 2 is the utility model embodiment schematic diagram；
Fig. 3 is the utility model embodiment schematic diagram；
Fig. 4 (a), (b), (c) are the utility model embodiment schematic diagrames；
Fig. 5 (a), (b), (c), (d) are the utility model embodiment schematic diagrames.
Specific embodiment
Below with reference to examples and drawings, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
It is as shown in Figure 1 the structural schematic diagram of the utility model small space sound bearing detection device, which includes
Wiring board 10；Be fixedly installed assist side 10 on and the distribution that is centrosymmetric three or three or more MEMS acoustic-electrical transducers
20, in the utility model embodiment, not due to three in actual production process or three or more MEMS acoustic-electrical transducers 20
The distribution that is accurately centrosymmetric can be completely secured, as long as so be substantially centrosymmetric distribution or those skilled in the art
It is considered that central symmetry distribution also belongs to the protection scope of the utility model.MEMS acoustic-electrical transducer 20 is used for received sound
Source signal is converted to electric signal, and the distance between adjacent MEMS acoustic-electrical transducer 20 is not more than two points of sound-source signal minimal wave length
One of；And including micro-control unit 30, every MEMS acoustic-electrical transducer 20 is electrically connected with micro-control unit 30 respectively；This
In utility model embodiment, every MEMS acoustic-electrical transducer 20, which can be, to be connected by conducting wire with micro-control unit 30, can also
To be to be connected by wiring board 10 with micro-control unit 30, naturally it is also possible to be other electric connection modes.Microcontroller list
The voice signal that member 30 is acquired according to three or three or more MEMS acoustic-electrical transducers 20, passes through the method for Finite-difference theory
Obtain the azimuth information of spatial sound source.In the utility model embodiment, MEMS acoustic-electrical transducer 20 is changed using omnidirectional MEMS acoustic-electric
Can device, and to be all made of identical existing most standard most mature for all MEMS acoustic-electrical transducers 20 in the utility model detection device
MEMS acoustic-electrical transducer, naturally it is also possible to using other small-sized or miniature omnidirectional MEMS acoustic-electrical transducers.It is typically due to
There are many sound-source signal of extraneous sound field is possible, its frequency of different sound-source signals and wavelength are different, in order to acquire as far as possible
All sound-source signals into sound field, in the utility model embodiment, the distance between adjacent MEMS acoustic-electrical transducer 20 cannot
Greater than the half of the wavelength of the smallest sound source of institute's sound source medium wavelength, between usual adjacent MEMS acoustic-electrical transducer 20 away from
From both referring to the distance between sound inlet.
In the utility model embodiment, micro-control unit 30 and all MEMS acoustic-electrical transducers 20 are by wiring board 10
Pad be fixedly connected, in order to more preferably realize extra small space, preferably micro-control unit 30 is consolidated in the utility model embodiment
Surely it is welded on the central symmetry point of multiple MEMS acoustic-electrical transducers 30, naturally it is also possible to be mounted on the wiring board convenient for miniaturization
In 10 other positions, micro-control unit 30 generallys use dedicated processes chip (asic chip).
The utility model spatial sound source orientation detection device is using in the same plane three or three or more
MEMS acoustic-electrical transducer 20, wiring board 10 is conventional planar circuit board at this time.As shown in Fig. 2, using MEMS acoustic-electrical transducer
211,214 4 MEMS acoustic-electrical transducer 212, MEMS acoustic-electrical transducer 213 and MEMS acoustic-electrical transducer MEMS sensors, and
It is symmetrical centered on four, i.e., the sound inlet phase line of aforementioned four MEMS sensor and form square, the square
Side length cannot be greater than the half of the wavelength of the smallest sound source of institute's sound source medium wavelength, and MEMS acoustic-electrical transducer 211, MEMS
The center position of acoustic-electrical transducer 212, MEMS acoustic-electrical transducer 213 and MEMS acoustic-electrical transducer 214 is equipped with microcontroller
Unit 30.Similarly, as shown in figure 3, using MEMS acoustic-electrical transducer 221, MEMS acoustic-electrical transducer 222 and MEMS acoustic-electric transducing
223 3 MEMS sensors of device, and three also centered on symmetrical, the i.e. sound inlet phase line of above three MEMS sensor
And equilateral triangle is formed, and the side length of the triangle cannot be greater than two points of the wavelength of the smallest sound source of institute's sound source medium wavelength
One of, the other center position of MEMS acoustic-electrical transducer 221, MEMS acoustic-electrical transducer 222, MEMS acoustic-electrical transducer 223
Micro-control unit 30 is installed.
The another embodiment of utility model device is that three or three or more MEMS acoustic-electrical transducers 20 are in
In Different Plane, certainly, when being in Different Plane if it is multiple MEMS acoustic-electrical transducers 20, it is necessary at least need four
A or four or more MEMS acoustic-electrical transducers 20 are just able to achieve.Four or four or more the MEMS sound in Different Plane
Electric transducer 20 is symmetrical centered on being also.For example, being changed using four MEMS acoustic-electrics on four angles of positive tetrahedron
Energy device 20, naturally it is also possible to be the design of other regular polygon structures, have identical omnidirectional on each angle of regular polygon
MEMS acoustic-electrical transducer 20, and wiring board at this time needs to be designed so as to the fixed peace of all multiple MEMS acoustic-electrical transducers 20
Dress, can not be planar circuit board.
In the utility model embodiment, spatial sound source orientation detection device further includes first screen with electromagnetic shielding action
Upper cover 40 is covered, and the first shielding upper cover 40 and wiring board 10 constitute the first electromagnetic shield regions, all MEMS acoustic-electric transducings
Other electronic components in device 20, micro-control unit 30 and setting assist side 10 are fixedly arranged at the first electromagnetic shielding
In region, extraneous electromagnetic interference is shielded.In the utility model embodiment, the first shielding upper cover 40 is using round, rectangular
Or the metal material of other miniaturization shapes is made, and is also possible to plating metal on surface material and is made.In order to allow
One shielding upper cover 40 is not easy to be oxidized, and is also possible to plating metal on surface oxide layer.
In the utility model embodiment, in order to which utility model device is connected with external device, which is provided with
Extraction wire, at this point, the utility model sound bearing detection device further include with first shielding upper cover 40 have same shape and
Material and the secondary shielding upper cover 50 that 40 periphery of the first shielding upper cover is set, and the side setting of secondary shielding upper cover 50 is useful
In the wire guide K1 of extraction wire.In order to preferably enhance the shield effectiveness of the first shielding upper cover 40 and secondary shielding upper cover 50,
First shielding upper cover 40 and secondary shielding upper cover 50 simultaneously or wherein any one is conducted with the ground line on wiring board 10.
In the utility model embodiment, the position being bonded on wiring board 10 with each MEMS acoustic-electrical transducer 20 is provided with
Aperture K2, these apertures K2 are aligned with the sound inlet of each MEMS acoustic-electrical transducer 20, and external sound can be opened by wiring board
It is telecommunications that the ante-chamber that the sound inlet of hole K2 and MEMS acoustic-electrical transducer 20 is constituted, which enters 20 inner transformation of MEMS acoustic-electrical transducer,
Number.In order to avoid dust and liquid enter aperture K2 and influence sound signal collecting, the aperture side of assist side 10 is provided with
Sound transparent layer 60 as shown in Figure 1, sound transparent layer 60 has the function of waterproof and dustproof, and there is good sound to penetrate effect.Sound transparent layer
60, which generally use windproof cotton, is made or for waterproof sound passing membrane, is fixedly mounted on secondary shielding and covers 50, can be buckle
Or the mode of gluing is fixedly mounted on secondary shielding and covers 50, others fixed form can also be with as long as not easily to fall off certainly
?.
In order to better solve spatial sound source orientation detection, the small space sound bearing based on the utility model detects dress
It sets, the utility model additionally provides a kind of spatial sound source orientation detection method, method includes the following steps:
S1, at least three MEMS acoustic-electrical transducer conducts are selected from three or three or more MEMS acoustic-electrical transducers
The combination of MEMS acoustic-electrical transducer, and selected equiphase point, according to Finite-difference theory building comprising at least two paths of differential signals and
The acoustic vector signal of omnidirectional signal all the way, the equiphase point refer to each way signal of acoustic vector signal generated with the sky
Between the same phase of voice signal put.It is excellent, it is preferable to use first-order difference microphone obtains differential signal in the utility model embodiment
Choosing uses single order dipole differential signal, and its beam pattern is in the figure of eight；
S2, data ratio between at least two-way sensor is acquired using at least two paths of differential signals and all the way omnidirectional signal, obtain
The one-shot measurement result in spatial sound source orientation；
S3, the equiphase point for selecting MEMS acoustic-electrical transducer combination again repeat step S1 and S2, from multiple and different
Equiphase point spatial sound source orientation is taken multiple measurements；
S4, the result repeatedly measured is weighted and averaged, obtains accurate spatial sound source orientation detection result.
The combination of MEMS acoustic-electrical transducer refers to from all MEMS acoustic-electric transducings used when utility model device is embodied
At least three composition subsets are chosen in device, can only then have a kind of MEMS acoustic-electric transducing if it is three omnidirectional's MEMS acoustic-electrical transducers
Device combination, if it is four or more omnidirectionals' MEMS acoustic-electrical transducer, according to the rule of permutation and combination, then there are four types of or more
A variety of MEMS acoustic-electrical transducer combinations.
Below to select two paths of differential signals and omnidirectional signal is constituted acoustic vector signal, detectable two-dimensional space sound field all the way
The orientation of interior sound source is example, i.e., using in the same plane three or three or more MEMS acoustic-electrical transducer, two-way
For differential signal in approximately the same plane, signal phase is identical, and beam pattern is in a certain angle, the angular range [30 °,
150 °] it is interior when the two-dimentional orientation of sound source can effectively be detected；And angle is best when taking 90 °, it can be when other conditions be identical
Obtain highest azimuth detection accuracy.In the utility model embodiment, the definition and calculating of above-mentioned " data ratio between sensor "
Mode is as follows, and enabling omnidirectional signal in acoustic vector signal is o (t)=s (t), specifies in the plane in two paths of differential signals any
Direction is the known respectively θ of the angle in two paths of differential signals and 0 ° of direction behind 0 ° of directions1、θs2, then two paths of differential signals can divide
It is not expressed as u (t)=s (t) cos (θ-θs1), v (t)=s (t) cos (θ-θs2).The discrete fourier change of o (t), u (t), v (t)
It is changed to O (ω), U (ω), V (ω), then two-way contains data ratio ISDR between the sensor of sound bearing information is defined as:
Due to θs1And θs2It is known angle, and works as θs1And θs2Between angle L when being in [30 °, 150 °] range,
By the antitrigonometric function of joint solution formula (1) and formula (2), the estimated values theta of the orientation angles of sound source can be uniquely determinedi。
For example, working as θs1=90 °, θs2=120 °, at this point, θs1And θs2Between angle be 30 °；Work as θs1=10 °, θs2=
160 °, at this point, θs1And θs2Between angle be 150 °；Also the orientation for uniquely determining sound source can be obtained by formula above
The estimated values theta of anglei.But work as θs1And θs2Between the sound bearing effect that detects when being 90 ° of angle it is best, that is, take optimal
When two differential signals of example are orthogonal, formula (1) and formula (2) be can be rewritten as:
By the antitrigonometric function of joint solution formula (3) and formula (4), the estimation of the orientation angles of sound source can be uniquely determined
Value θi。
In front in step S3, because MEMS acoustic-electrical transducer combination selected every time is different with equiphase point, to sound source
The estimated value of orientation angles is also different.The sound bearing angular estimation value that each time measures is denoted as θi, i=1,2 ..., M, then most
Eventually to the estimation at sound bearing angle are as follows:
Wherein wiThe weight measured for each time can take w for conveniencei=1.
In the utility model embodiment, using three MEMS acoustical-electrical transducers on same plane, 3 groups of acoustic vectors are produced
Signal measures the orientation of sound source three times, (conceals asic chip as shown in Fig. 4 (a), only retains MEMS acoustical-electrical transducer
Spatial relation) be using the acoustical-electrical transducer of the rightmost side as the beam pattern of equiphase point；As shown in Fig. 4 (b) be with
The acoustical-electrical transducer of upside is the beam pattern of equiphase point；It is using the acoustical-electrical transducer of downside as phase shown in such as Fig. 4 (c)
The beam pattern in site.Similarly, in the embodiment using four MEMS acoustical-electrical transducers of plane, four groups of sound arrows are produced
Signal is measured, four measurements are carried out to the orientation of sound source, (asic chip is equally concealed as shown in Fig. 5 (a), only retains MEMS acoustic-electric
The spatial relation of converter) it is using the acoustical-electrical transducer of the rightmost side as the beam pattern of equiphase point；Such as Fig. 5 (b) institute
Show it is using the acoustical-electrical transducer of top side as the beam pattern of equiphase point；It is to be turned as shown in Fig. 5 (c) with the acoustic-electric of the leftmost side
Parallel operation is the beam pattern of equiphase point；It is using the acoustical-electrical transducer of lower side as the wave beam of equiphase point as shown in Fig. 5 (d)
Directional diagram.
In the utility model embodiment, according to above-mentioned two-dimensional surface implementation principle, those skilled in the art can also root
According to the content of the present invention, using more than two-way and not differential signal in the same plane, the three-dimensional letter of sound source is detected
Breath detects azimuth and the pitch angle of sound source simultaneously.When the differential signal for having two-way or more is available, such as three tunnels, as long as
Three-pass DINSAR signal is in Different Plane, can detect azimuth and the pitch angle of sound source, and any differential signal all the way simultaneously
It should be greater than being equal to 30 ° and no more than 150 ° with the angle of plane where other two paths of differential signals；And when three-pass DINSAR signal is mutual
System performance is best when mutually orthogonal, highest azimuth detection accuracy can be obtained when other conditions are identical, because of its orientation detection
Principle is similar with orientation detection principle when two-dimensional surface, and details are not described herein.
In conclusion the utility model small space sound bearing detection device is using multiple MEMS acoustic-electrical transducers and specially
With the sound-conducting apparatus that processing chip building volume is extra small, the sound pressure information of sound field can be not only acquired, while sound field can be acquired
Directivity information, to detect the direction of main sound source in sound field；The white noise that differential signal is solved simultaneously in low-frequency range increases
The excessive problem of benefit；Also it solves the inconsistent bring difference evaluated error of frequency response and phase between MEMS acoustic-electrical transducer to ask
Topic.In addition, the utility model small space sound bearing detection device uses the most mature omnidirectional MEMS acoustic-electrical transducer of most standard
It builds, the MEMS microphone preparation process new without additional designs, cost can accomplish minimum, meet the need of consumer electronics
It asks.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles for not violating the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (11)
1. a kind of small space sound bearing detection device, which is characterized in that described device includes wiring board；
It is fixed on the wiring board and three or three or more MEMS acoustic-electrical transducers of the distribution that is centrosymmetric, institute
MEMS acoustic-electrical transducer is stated for received sound-source signal to be converted to electric signal, between the adjacent MEMS acoustic-electrical transducer
Distance is not more than the half of sound-source signal minimal wave length；
And micro-control unit, each MEMS acoustic-electrical transducer are electrically connected with the micro-control unit respectively；
The voice signal that the micro-control unit is acquired according to described three or three or more MEMS acoustic-electrical transducer obtains empty
Between sound source azimuth information.
2. small space sound bearing according to claim 1 detection device, which is characterized in that described three or three
The above MEMS acoustic-electrical transducer is identical omnidirectional MEMS acoustic-electrical transducer, and is centrosymmetric and is distributed in the wiring board
On, the distance between adjacent described omnidirectional MEMS acoustic-electrical transducer is not more than the half of sound-source signal minimal wave length.
3. small space sound bearing according to claim 2 detection device, which is characterized in that described three or three
The above MEMS acoustic-electrical transducer is three be in the same plane or three or more MEMS acoustic-electrical transducer, and described three
Or three or more MEMS acoustic-electrical transducers are centrosymmetric and are distributed on the wiring board.
4. small space sound bearing according to claim 2 detection device, which is characterized in that described three or three
The above MEMS acoustic-electrical transducer is four or four or more the MEMS acoustic-electrical transducers in Different Plane.
5. small space sound bearing according to claim 3 detection device, which is characterized in that described device further includes tool
There is the first shielding upper cover of electromagnetic shielding action, the first shielding upper cover and the wiring board constitute the first electromagnetic shielding area
Domain；Described three or three or more MEMS acoustic-electrical transducers and micro-control unit are in first electromagnetic shield regions.
6. small space sound bearing according to claim 5 detection device, which is characterized in that described device further includes tool
Have electromagnetic shielding action and be located at it is described first shielding upper cover periphery secondary shielding upper cover, the secondary shielding upper cover with it is described
Wiring board constitutes the second electromagnetic shield regions, and first electromagnetic shield regions are in second electromagnetic shield regions, institute
The side for stating secondary shielding upper cover is provided with wire guide.
7. small space sound bearing according to claim 6 detection device, which is characterized in that the first shielding upper cover
And/or secondary shielding upper cover is conducted with the ground line on the wiring board.
8. small space sound bearing according to claim 6 detection device, which is characterized in that on the wiring board and often
The position of one MEMS acoustic-electrical transducer fitting is provided with aperture, and the aperture and the MEMS acoustic-electrical transducer into
Sound hole alignment.
9. small space sound bearing according to claim 6 detection device, which is characterized in that described device further includes setting
The sound transparent layer in wiring board aperture side is set, the sound transparent layer is fixed on the secondary shielding on lid.
10. small space sound bearing according to claim 9 detection device, which is characterized in that the sound transparent layer is anti-
Wind cotton or waterproof sound passing membrane.
11. small space sound bearing according to claim 9 detection device, which is characterized in that the sound transparent layer passes through
Mode including buckle or gluing is fixed on the secondary shielding on lid.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490384A (en) * | 2018-03-30 | 2018-09-04 | 深圳海岸语音技术有限公司 | A kind of small space sound bearing detection device and its method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490384A (en) * | 2018-03-30 | 2018-09-04 | 深圳海岸语音技术有限公司 | A kind of small space sound bearing detection device and its method |
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