CN104244142A - Microphone array, microphone array obtaining method and electronic device - Google Patents
Microphone array, microphone array obtaining method and electronic device Download PDFInfo
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- CN104244142A CN104244142A CN201310250343.9A CN201310250343A CN104244142A CN 104244142 A CN104244142 A CN 104244142A CN 201310250343 A CN201310250343 A CN 201310250343A CN 104244142 A CN104244142 A CN 104244142A
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Abstract
The embodiment of the invention provides a microphone array, a microphone array obtaining method and an electronic device and relates to the digital signal processing field. By the adoption of the microphone array, limitation on the distance between sensors in the microphone array can be eliminated, and free adjustment of the size of the microphone array can be achieved. The microphone array comprises at least one sensor used for receiving the sound from a sound source, wherein a dielectric layer is arranged between the sound source and each sensor, and the density or thickness of each dielectric layer is controllable. The microphone array is connected with a controller which controls the density or thickness of each dielectric layer according to an input condition.
Description
Technical field
The present invention relates to digital processing field, particularly relate to a kind of microphone array, implementation method and electronic equipment.
Background technology
Along with the development of Digital Signal Processing, microphone array technology started to be widely used in comprise computer, mobile terminal, audio/video communication conference system, speech recognition system etc. multiple systems in the middle of.Compared with single microphone, microphone array passes through Wave beam forming, in the specific direction that can be implemented in spatial domain, spatial sampling is carried out to signal specific, and utilize the spatial information obtained of sampling to realize the enhancing of a certain specific direction signal and the suppression to other direction signals, thus can realize catching sound more delicately, effective suppression ambient noise, eliminates echo impact.
The key adopting microphone array to carry out spacing wave sampling is Wave beam forming, Wave beam forming is also space filtering, be weighted particular by each array element, form main beam in a desired direction, thus strengthen the signal expected, on interference signal direction, form very dark zero point simultaneously, reach the object suppressing interference signal.Time microphone array is listed in and adopts Wave beam forming to carry out noise suppression, need between each microphone to maintain a certain distance to form phase difference.This just requires that the distance between each microphone will reach pre-set dimension.When the size of electronic equipment is less, such as undersized mobile phone or panel computer, when these equipment use microphone arrays, corresponding equipment size will limit by the layout requirements of microphone array, thus cause arbitrarily to adjust equipment size.
Summary of the invention
Embodiments of the invention provide a kind of microphone array, implementation method and electronic equipment, can overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The one side of the embodiment of the present invention, provides a kind of microphone array, comprises at least one for receiving the transducer of the sound from sound source.
Between described sound source and described transducer, there is dielectric layer;
Described dielectric layer density or thickness controlled;
Described microphone array is connected with a controller, and described controller controls described dielectric layer density or thickness according to an initial conditions.
The another aspect of the embodiment of the present invention, provides, a kind of electronic equipment arranging microphone array, and described microphone array is classified as microphone array as above.
The another aspect of the embodiment of the present invention, provides a kind of microphone array implementation method, is applied to the electronic equipment that arranges microphone array, and described microphone array comprises at least one for receiving the transducer of the sound from sound source, comprising:
Transducer receives from the sound of described sound source, has dielectric layer between described sound source and described transducer, described dielectric layer density or thickness controlled;
Described dielectric layer density or thickness is controlled according to an initial conditions.
The microphone array that the embodiment of the present invention provides, implementation method and electronic equipment, this microphone array comprises at least one for receiving the transducer of the sound from sound source, has density or the controlled dielectric layer of thickness between sound source and this transducer; This microphone array is connected with a controller, and this controller is according to initial conditions control medium layer density or a thickness.By increasing dielectric layer between sound source and transducer, the speed that sound is propagated in this section of space can be controlled, thus enter the time of transducer from sound source sounding to voice signal without the need to the distance between limiting sensor and adjustable, so, overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
Accompanying drawing explanation
The structural representation of a kind of microphone array that Fig. 1 provides for the embodiment of the present invention;
The structural representation of another microphone array that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of a kind of microphone array implementation method that Fig. 3 provides for the embodiment of the present invention;
The schematic flow sheet of another microphone array implementation method that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The microphone array 10 that the embodiment of the present invention provides, as shown in Figure 1, comprises at least one for receiving the transducer 11 from the sound of sound source 20.
There is between sound source 20 and transducer 11 dielectric layer 12.
Wherein, dielectric layer 11 density or thickness controlled.
Microphone array 10 is connected with a controller 13, and this controller 13 is according to the density of an initial conditions control medium layer 11 or thickness.
In embodiments of the present invention, transducer can adopt any one sound transducer existing, such as microphone.Transducer in microphone array can have various arrangement mode, such as, can be the linear array of one dimension, can also time the circular array of two dimension or face array, arrangement mode can be selected according to actual conditions, in this citing that differs.
The microphone array that the embodiment of the present invention provides, this microphone array comprises at least one for receiving the transducer of the sound from sound source, has density or the controlled dielectric layer of thickness between sound source and this transducer; This microphone array is connected with a controller, and this controller is according to initial conditions control medium layer density or a thickness.By increasing dielectric layer between sound source and transducer, the speed that sound is propagated in this section of space can be controlled, thus enter the time of transducer from sound source sounding to voice signal without the need to the distance between limiting sensor and adjustable, so, overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
Concrete, in microphone array 10 as shown in Figure 1, transducer 11 can comprise first sensor 111 and the second transducer 112.Wherein, this first sensor 111 and the second transducer 112 can be disposed adjacent, and have density or the controlled first medium layer 121 of thickness between first sensor 111 and sound source 20.
In microphone array, in order to form main beam in a desired direction, realize Wave beam forming, the phase difference preset of demand fulfillment usually between the voice signal that two transducers receive, this time arriving each transducer with regard to the sound requiring sound source to send is different.The time that the sound sent to realize sound source arrives each transducer is different, prior art requires the pre-set dimension that the distance between the transducer of microphone array reaches certain usually, because sound transmission distance is different, the time arriving transducer is different, thus achieves Wave beam forming.But so, the size of microphone array is relatively fixing, it is made to be difficult to be applied to the less portable electric appts of overall dimensions.
It should be noted that, the microphone array that the embodiment of the present invention provides is the velocity of sound that the sound sent by changing sound source arrives transducer, thus realizes the Wave beam forming of microphone array.Concrete, in embodiments of the present invention, by arranging dielectric layer between sound source and transducer, this dielectric layer can change the velocity of sound of the sound arrival transducer that sound source sends.Concrete, according to the principle of Laplace's equation, can derive sound propagation velocity is in media as well:
C=(kRT)
0.5formula 1
Wherein, k is the specific heat ratio of medium, and R is the ratio thermal constant of medium, the ambient temperature of T residing for medium.By knowing the derivation of Laplce's velocity of sound equation, the propagation velocity of sound and the inverse of Media density and temperature have relation.So, if the distance (i.e. the thickness of dielectric layer) that adjustment transducer is propagated in the dielectric layer at density or the adjustment sound of the collection medium of sound collection end, namely can control the speed that sound is propagated in this section of space, thus adjustment enters time of transducer from sound source voice signal of sounding.So, even if when the distance between the transducer of microphone array is less, due to the velocity of sound difference of the sound arrival transducer that sound source sends, the time that thus can realize sound arrival transducer is equally different, and then achieves Wave beam forming.
Further, as shown in Figure 2, density or the controlled second dielectric layer 122 of thickness can also be had between sound source 20 and the second transducer 112.
Density or the thickness of first medium layer 111 and second dielectric layer 112 are different.
So, the accurate control sound that sound source sends being arrived to the time difference between adjacent transducer can be realized, improve the flexibility of microphone array adjusted size.
Further, as shown in Figure 2, microphone array 10 can also comprise:
Detecting unit 14, for detecting the spacing of first sensor 111 and the second transducer 112.
Accordingly, controller 13 can also comprise:
Adjustment unit 131, for when the spacing of first sensor 111 and the second transducer 112 changes, the density of adjustment first medium layer 121 or thickness, and/or adjust density or the thickness of second dielectric layer 122, meet preset phase difference with the voice signal making first sensor 111 and the second transducer 112 receive.
Such as, the microphone of multiple mobile device can be adopted respectively as multiple transducers of microphone array, because the spacing between multiple transducer can change according to the spacing change of mobile device, therefore when detecting unit 14 detects that the spacing of first sensor 111 and the second transducer 112 reduces, in order to the voice signal making first sensor 111 and the second transducer 112 receive meets default phase difference, need to improve the time difference that sound arrives first sensor 111 and the second transducer 112 respectively, adjustment unit 131 can by the density of adjustment first medium layer 121 or second dielectric layer 122 or thickness to change sound propagation velocity in the dielectric layer, thus the voice signal realizing first sensor 111 and the reception of the second transducer 112 meets preset phase difference.
Adopt a kind of like this microphone array of structure, by increasing dielectric layer between sound source and transducer, the speed that sound is propagated in this section of space can be controlled, thus enter the time of transducer from sound source sounding to voice signal without the need to the distance between limiting sensor and adjustable, so, overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
The embodiment of the present invention also provides a kind of electronic equipment, comprises microphone array as above.
In embodiments of the present invention, electronic equipment can comprise existing any one and has the electronic equipment of microphone array.Such as, electronic equipment can be mobile phone, e-book, panel computer or notebook computer etc.
The electronic equipment that the embodiment of the present invention provides, comprises microphone array, and this microphone array comprises at least one for receiving the microphone of the sound from sound source, has density or the controlled dielectric layer of thickness between sound source and this transducer; This microphone array is connected with a controller, and this controller is according to initial conditions control medium layer density or a thickness.By increasing dielectric layer between sound source and microphone, the speed that sound is propagated in this section of space can be controlled, thus to enter the time of microphone from sound source sounding to voice signal without the need to limiting distance between microphone and adjustable, so, overcome the restriction to the spacing of microphone in microphone array, realize any adjustment of microphone array size.
The embodiment of the present invention also provides a kind of microphone array implementation method, is applied to the electronic equipment that arranges microphone array, and this microphone array comprises at least one for receiving the transducer of the sound from sound source, and as shown in Figure 3, the method comprises:
S301, transducer receive from the sound of sound source, have dielectric layer between this sound source and transducer, this dielectric layer density or thickness controlled.
S302, according to initial conditions control medium layer density or a thickness.
In embodiments of the present invention, transducer can adopt any one sound transducer existing, such as microphone.Transducer in microphone array can have various arrangement mode, such as, can be the linear array of one dimension, and can also be circular array or the face array of two dimension, arrangement mode can be selected according to actual conditions, in this citing that differs.
The microphone array implementation method that the embodiment of the present invention provides, this microphone array comprises at least one for receiving the transducer of the sound from sound source, has density or the controlled dielectric layer of thickness between sound source and this transducer; This microphone array is connected with a controller, and this controller is according to initial conditions control medium layer density or a thickness.By increasing dielectric layer between sound source and transducer, the speed that sound is propagated in this section of space can be controlled, thus enter the time of transducer from sound source sounding to voice signal without the need to the distance between limiting sensor and adjustable, so, overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
Concrete, can the microphone array 10 shown in reference diagram 1, transducer 11 can comprise first sensor 111 and the second transducer 112.Wherein, this first sensor 111 and the second transducer 112 can be disposed adjacent, and have density or the controlled first medium layer 121 of thickness between first sensor 111 and sound source 20.
In microphone array, in order to form main beam in a desired direction, realize Wave beam forming, the phase difference that between the voice signal that adjacent transducer receives, usual demand fulfillment is preset, this time arriving each transducer with regard to the sound requiring sound source to send is different.The time that the sound sent to realize sound source arrives each transducer is different, prior art requires the pre-set dimension that the distance between the transducer of microphone array reaches certain usually, because sound transmission distance is different, the time arriving transducer is different, thus achieves Wave beam forming.But so, the size of microphone array is relatively fixing, it is made to be difficult to be applied to the less portable electric appts of overall dimensions.
It should be noted that, the microphone array that the embodiment of the present invention provides is the velocity of sound that the sound sent by changing sound source arrives transducer, thus realizes the Wave beam forming of microphone array.Concrete, in embodiments of the present invention, by arranging dielectric layer between sound source and transducer, this dielectric layer can change the velocity of sound of the sound arrival transducer that sound source sends.Its principle as previously mentioned, so, even if when the distance between the transducer of microphone array is less, due to the velocity of sound difference of the sound arrival transducer that sound source sends, the time that thus can realize sound arrival transducer is equally different, and then achieves Wave beam forming.
Further, can the microphone array 10 shown in reference diagram 1, density or the controlled second dielectric layer of thickness can also be had between sound source 20 and the second transducer 112.
Density or the thickness of first medium layer and second dielectric layer are different.
So, the accurate control sound that sound source sends being arrived to the time difference between adjacent transducer can be realized, improve the flexibility of microphone array adjusted size.
Further, as shown in Figure 4, the microphone array implementation method that the embodiment of the present invention provides specifically can comprise:
S401, transducer receive from the sound of sound source, have dielectric layer between this sound source and transducer, this dielectric layer density or thickness controlled.
The spacing of S402, detection first sensor and the second transducer.
Accordingly, step S302 is specifically as follows:
S403, when the spacing of first sensor and the second transducer changes, the density of adjustment first medium layer or thickness, and/or adjust density or the thickness of second dielectric layer, meet preset phase difference with the voice signal making first sensor and the second transducer receive.
Such as, the microphone of multiple mobile device can be adopted respectively as multiple transducers of microphone array, because the spacing between multiple transducer can change according to the spacing change of mobile device, therefore when detecting unit detects that the spacing of first sensor and the second transducer reduces, in order to the voice signal making first sensor and the second transducer receive meets default phase difference, need to improve the time difference that sound arrives first sensor and the second transducer respectively, adjustment unit can by adjustment first medium layer or the density of second dielectric layer or thickness to change sound propagation velocity in the dielectric layer, thus the voice signal realizing first sensor and the reception of the second transducer meets preset phase difference.
Adopt a kind of like this microphone array of structure, by increasing dielectric layer between sound source and transducer, the speed that sound is propagated in this section of space can be controlled, thus enter the time of transducer from sound source sounding to voice signal without the need to the distance between limiting sensor and adjustable, so, overcome the restriction to the spacing of transducer in microphone array, realize any adjustment of microphone array size.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (9)
1. a microphone array, comprising at least one for receiving the transducer of the sound from sound source, it is characterized in that,
Between described sound source and described transducer, there is dielectric layer;
Described dielectric layer density or thickness controlled;
Described microphone array is connected with a controller, and described controller controls described dielectric layer density or thickness according to an initial conditions.
2. microphone array according to claim 1, is characterized in that, described transducer comprises first sensor and the second transducer;
There is between described first sensor and described sound source density or the controlled first medium layer of thickness; And/or have density or the controlled second dielectric layer of thickness between described second transducer and described sound source, density or the thickness of described first medium layer and described second dielectric layer are different;
The voice signal that described first sensor and described second transducer receive meets preset phase difference, to realize Wave beam forming.
3. microphone array according to claim 2, is characterized in that, described microphone array also comprises:
Detecting unit, for detecting the spacing of described first sensor and described second transducer.
4. microphone array according to claim 3, is characterized in that, described controller comprises:
Adjustment unit, for when the spacing of described first sensor and described second transducer changes, adjust density or the thickness of described first medium layer, and/or adjust density or the thickness of described second dielectric layer, meet described preset phase with the voice signal making described first sensor and described second transducer receive poor.
5. an electronic equipment for microphone array is set, it is characterized in that, described microphone array be classified as arbitrary in claim 1-4 as described in microphone array.
6. a microphone array implementation method, is applied to the electronic equipment that arranges microphone array, and described microphone array comprises at least one for receiving the transducer of the sound from sound source, it is characterized in that, comprising:
Transducer receives from the sound of described sound source, has dielectric layer between described sound source and described transducer, described dielectric layer density or thickness controlled;
Described dielectric layer density or thickness is controlled according to an initial conditions.
7. microphone array implementation method according to claim 6, is characterized in that, described transducer comprises first sensor and the second transducer;
There is between described first sensor and described sound source density or the controlled first medium layer of thickness; And/or have density or the controlled second dielectric layer of thickness between described second transducer and described sound source, density or the thickness of described first medium layer and described second dielectric layer are different;
The voice signal that described first sensor and described second transducer receive meets preset phase difference, to realize Wave beam forming.
8. the microphone array implementation method according to claim 6 or 7, is characterized in that, described method also comprises:
Detect the spacing of described first sensor and described second transducer.
9. microphone array implementation method according to claim 8, is characterized in that, describedly controls described dielectric layer density according to an initial conditions or thickness comprises:
When the spacing of described first sensor and described second transducer changes, adjust density or the thickness of described first medium layer, and/or adjust density or the thickness of described second dielectric layer, meet described preset phase with the voice signal making described first sensor and described second transducer receive poor.
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| CN102045618A (en) * | 2009-10-19 | 2011-05-04 | 联想(北京)有限公司 | Automatically adjusted microphone array, method for automatically adjusting microphone array, and device carrying microphone array |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1257146A2 (en) * | 2001-05-03 | 2002-11-13 | Motorola, Inc. | Method and system of sound processing |
| CN1674828A (en) * | 2002-07-17 | 2005-09-28 | 威猛公司 | Ultrasound array transducer for catheter use |
| US20050195990A1 (en) * | 2004-02-20 | 2005-09-08 | Sony Corporation | Method and apparatus for separating sound-source signal and method and device for detecting pitch |
| CN101268715A (en) * | 2005-11-02 | 2008-09-17 | 雅马哈株式会社 | Teleconference device |
| CN102045618A (en) * | 2009-10-19 | 2011-05-04 | 联想(北京)有限公司 | Automatically adjusted microphone array, method for automatically adjusting microphone array, and device carrying microphone array |
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