CN104244142B - A kind of microphone array, implementation method and electronic equipment - Google Patents
A kind of microphone array, implementation method and electronic equipment Download PDFInfo
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- CN104244142B CN104244142B CN201310250343.9A CN201310250343A CN104244142B CN 104244142 B CN104244142 B CN 104244142B CN 201310250343 A CN201310250343 A CN 201310250343A CN 104244142 B CN104244142 B CN 104244142B
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Abstract
The embodiment of the present invention provides a kind of microphone array, implementation method and electronic equipment, is related to digital processing field, can overcome the limitation to distance between sensor in microphone array, realizes the arbitrary adjustment of microphone array size.Microphone array includes at least one sensor for sound of the reception from sound source, has dielectric layer between the sound source and the sensor；The dielectric layer density or thickness are controllable；The microphone array is connected with a controller, and the controller controls the dielectric layer density or thickness according to an input condition.
Description
Technical field
The present invention relates to a kind of digital processing field more particularly to microphone array, implementation method and electronic equipments.
Background technology
With the continuous development of Digital Signal Processing, microphone array technology have begun to be widely used in including
Among multiple systems including computer, mobile terminal, audio/video communication conference system, speech recognition system etc..With single wheat
Gram wind facies ratio, microphone array can be realized by Wave beam forming and carry out space to signal specific in the specific direction in spatial domain
Sampling, and realize the enhancing to a certain specific direction signal and to other direction signals using the obtained spatial information of sampling
Inhibit, sound is more delicately captured so as to realize, effectively inhibit ambient noise, eliminating echo influences.
The key that spacing wave sampling is carried out using microphone array is Wave beam forming, and Wave beam forming also makes space filter
Ripple is weighted particular by each array element, forms main beam in a desired direction, so as to enhance desired signal, together
When very deep zero point is upwardly formed in interference signal side, achieve the purpose that inhibit interference signal.Microphone array is listed in using wave beam
When forming progress noise suppression, need to maintain a certain distance to form phase difference between each microphone.This requires
The distance between each microphone will reach pre-set dimension.When the size of electronic equipment is smaller, for example, the mobile phone of small size or
Tablet computer, when these equipment use microphone array, corresponding equipment size will be by the layout requirements of microphone array
It is limited, so as to cause can not be arbitrarily adjusted to equipment size.
The content of the invention
The embodiment of the present invention provides a kind of microphone array, implementation method and electronic equipment, can overcome microphone array
To the limitation of distance between sensor in row, the arbitrary adjustment of microphone array size is realized.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
The one side of the embodiment of the present invention provides a kind of microphone array, and sound source is come from for receiving including at least one
Sound sensor.
There is dielectric layer between the sound source and the sensor；
The dielectric layer density or thickness are controllable；
The microphone array is connected with a controller, and the controller controls the dielectric layer close according to an input condition
Degree or thickness.
The another aspect of the embodiment of the present invention provides, a kind of electronic equipment for setting microphone array, the microphone array
It is classified as microphone array as described above.
The another aspect of the embodiment of the present invention provides a kind of microphone array implementation method, and microphone is set applied to one
The electronic equipment of array, the microphone array include at least one sensor for sound of the reception from sound source, including：
Sensor receives the sound from the sound source, has dielectric layer between the sound source and the sensor, described
Dielectric layer density or thickness are controllable；
The dielectric layer density or thickness are controlled according to an input condition.
Microphone array provided in an embodiment of the present invention, implementation method and electronic equipment, the microphone array are included at least
One sensor for sound of the reception from sound source, with the medium that density or thickness are controllable between sound source and the sensor
Layer；The microphone array is connected with a controller, which controls dielectric layer density or thickness according to an input condition.Pass through
Increase dielectric layer between sound source and sensor, the speed that sound can be controlled to be propagated in this section of space, without limitation
The distance between sensor is the adjustable time for entering sensor from sound source sounding to voice signal, so, is overcome
To the limitation of distance between sensor in microphone array, the arbitrary adjustment of microphone array size is realized.
Description of the drawings
Fig. 1 is a kind of structure diagram of microphone array provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of another microphone array provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram of microphone array implementation method provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of another microphone array implementation method provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
Microphone array 10 provided in an embodiment of the present invention, as shown in Figure 1, coming from sound source including at least one for receiving
The sensor 11 of 20 sound.
There is dielectric layer 12 between sound source 20 and sensor 11.
Wherein, 11 density of dielectric layer or thickness are controllable.
Microphone array 10 is connected with a controller 13, which controls the close of dielectric layer 11 according to an input condition
Degree or thickness.
In embodiments of the present invention, any one existing sound transducer, such as microphone may be employed in sensor.Wheat
Sensor in gram wind array can have various arrangement mode, such as can be one-dimensional linear array, can with when two dimension
Circular array or face array, arrangement mode can be made choice according to actual conditions, differ a citing herein.
Microphone array provided in an embodiment of the present invention, the microphone array come from sound source including at least one for receiving
Sound sensor, there is density or the controllable dielectric layer of thickness between sound source and the sensor；The microphone array and one
Controller is connected, which controls dielectric layer density or thickness according to an input condition.By between sound source and sensor
Increase dielectric layer, the speed that sound can be controlled to be propagated in this section of space is without the distance between limiting sensor
The adjustable time for entering sensor from sound source sounding to voice signal so, is overcome in microphone array to sensing
The arbitrary adjustment of microphone array size is realized in the limitation of distance between device.
Specifically, in microphone array 10 as shown in Figure 1, sensor 11 can include first sensor 111 and the
Two sensors 112.Wherein, the first sensor 111 and second sensor 112 can be disposed adjacent, first sensor 111 and sound
With the first medium layer 121 that density or thickness are controllable between source 20.
In microphone array, in order to form main beam in a desired direction, Wave beam forming, two sensor institutes are realized
It usually requires to meet default phase difference between the voice signal of reception, this requires the sound that sound source is sent reaches each sensing
The time of device is different.In order to realize sound that sound source sends reach each sensor time it is different, the prior art usually requires that
The distance between sensor of microphone array reaches certain pre-set dimension, since sound transmission distance is different, reaches sensing
The time of device is different, it is achieved thereby that Wave beam forming.But so, the size of microphone array is relatively fixed, and makes it
It is difficult to apply to the smaller portable electric appts of overall dimensions.
It is arrived it should be noted that the microphone array that the embodiment of the present invention is provided is the sound sent by changing sound source
Up to the velocity of sound of sensor, so as to fulfill the Wave beam forming of microphone array.Specifically, in embodiments of the present invention, by sound
Dielectric layer is set between source and sensor, which can change the velocity of sound that the sound that sound source is sent reaches sensor.Specifically
, according to the principle of Laplace's equation, it can derive that the spread speed of sound in media as well is：
C=(kRT)0.5Formula 1
Wherein, k is the specific heat ratio of medium, and R is the ratio thermal constant of medium, and T is the environment temperature residing for medium.By to drawing
The derivation of this velocity of sound equation of pula is it is recognised that the spread speed of sound and the inverse of Media density and temperature have relation.
So if adjustment sensor the collection medium at sound collection end density or adjustment sound propagate in the dielectric layer away from
From (i.e. the thickness of dielectric layer), you can with the speed that sound is controlled to be propagated in this section of space, sound is sent so as to adjust from sound source
Sound enters the time of sensor to voice signal.So, even if when the distance between the sensor of microphone array is smaller
When, the velocity of sound that the sound that is sent due to sound source reaches sensor is different, thus can equally realize sound reach sensor when
Between it is different, and then realize Wave beam forming.
It further, as shown in Fig. 2, can also be controllable with density or thickness between sound source 20 and second sensor 112
Second dielectric layer 122.
First medium layer 121 is different from the density or thickness of second dielectric layer 122.
So, the accurate control that the time difference between adjacent sensor is reached to the sound that sound source is sent can be realized
System, improves the flexibility of microphone array size adjusting.
Further, as shown in Fig. 2, microphone array 10 can also include：
Detection unit 14, for detecting the spacing of first sensor 111 and second sensor 112.
Correspondingly, controller 13 can also include：
Adjustment unit 131, for when the spacing of first sensor 111 and second sensor 112 changes, adjustment the
The density or thickness of one dielectric layer 121 and/or the density or thickness for adjusting second dielectric layer 122, so that first sensor
111 and the voice signal that receives of second sensor 112 to meet preset phase poor.
For example, multiple sensors of the microphone as microphone array of multiple mobile equipment can be respectively adopted, due to
Spacing between multiple sensors can change according to the spacing of mobile equipment and be changed, therefore when detection unit 14 detects first
When the spacing of sensor 111 and second sensor 112 reduces, in order to enable first sensor 111 and second sensor 112 receive
Voice signal meet default phase difference, it is necessary to which improving sound arrives separately at first sensor 111 and second sensor 112
Time difference, adjustment unit 131 can be by adjusting the density or thickness of first medium layer 121 or second dielectric layer 122 to change
The spread speed of sound in the dielectric layer, the voice signal received so as to fulfill first sensor 111 and second sensor 112 are expired
Sufficient preset phase is poor.
Using the microphone array of such a structure, by increasing dielectric layer between sound source and sensor, can control
The speed that sound processed is propagated in this section of space, without the distance between limiting sensor it is i.e. adjustable from sound source sounding to
Voice signal enters the time of sensor, so, overcomes the limitation to distance between sensor in microphone array, real
The arbitrary adjustment of existing microphone array size.
The embodiment of the present invention also provides a kind of electronic equipment, including microphone array as described above.
In embodiments of the present invention, electronic equipment can be set including any one existing electronics with microphone array
It is standby.For example, electronic equipment can be mobile phone, e-book, tablet computer or laptop etc..
Electronic equipment provided in an embodiment of the present invention, including microphone array, which includes at least one use
In the microphone for receiving the sound from sound source, with the dielectric layer that density or thickness are controllable between sound source and the sensor；It should
Microphone array is connected with a controller, which controls dielectric layer density or thickness according to an input condition.By in sound
Increase dielectric layer between source and microphone, the speed that sound can be controlled to be propagated in this section of space, without limiting Mike
The distance between wind is the adjustable time for entering microphone from sound source sounding to voice signal, so, overcomes Mike
To the limitation of distance between microphone in wind array, the arbitrary adjustment of microphone array size is realized.
The embodiment of the present invention also provides a kind of microphone array implementation method, the electronics for setting microphone array applied to one
Equipment, which includes at least one sensor for sound of the reception from sound source, as shown in figure 3, this method
Including：
S301, sensor receive the sound from sound source, have dielectric layer between the sound source and sensor, and the dielectric layer is close
Degree or thickness are controllable.
S302, dielectric layer density or thickness are controlled according to an input condition.
In embodiments of the present invention, any one existing sound transducer, such as microphone may be employed in sensor.Wheat
Sensor in gram wind array can have various arrangement mode, such as can be one-dimensional linear array, can also be two dimension
Circular array or face array, arrangement mode can be made choice according to actual conditions, differ a citing herein.
Microphone array implementation method provided in an embodiment of the present invention, the microphone array are used to receive including at least one
The sensor of sound from sound source, with the dielectric layer that density or thickness are controllable between sound source and the sensor；The microphone
Array is connected with a controller, which controls dielectric layer density or thickness according to an input condition.By in sound source and biography
Increase dielectric layer between sensor, the speed that sound can be controlled to be propagated in this section of space, without between limiting sensor
Distance be the adjustable time for entering sensor from sound source sounding to voice signal, so, overcome microphone array
In limitation to distance between sensor, realize the arbitrary adjustment of microphone array size.
Specifically, may be referred to microphone array 10 shown in FIG. 1, sensor 11 can include 111 He of first sensor
Second sensor 112.Wherein, the first sensor 111 and second sensor 112 can be disposed adjacent, first sensor 111 with
With the first medium layer 121 that density or thickness are controllable between sound source 20.
In microphone array, in order to form main beam in a desired direction, Wave beam forming, adjacent sensor are realized
It usually requires to meet default phase difference between the voice signal received, this requires the sound that sound source is sent reaches each biography
The time of sensor is different.In order to realize sound that sound source sends reach each sensor time it is different, the prior art usually will
The distance between sensor of microphone array is asked to reach certain pre-set dimension, since sound transmission distance is different, reaches and passes
The time of sensor is different, it is achieved thereby that Wave beam forming.But so, the size of microphone array is relatively fixed, and is made
It is difficult to apply to the smaller portable electric appts of overall dimensions.
It is arrived it should be noted that the microphone array that the embodiment of the present invention is provided is the sound sent by changing sound source
Up to the velocity of sound of sensor, so as to fulfill the Wave beam forming of microphone array.Specifically, in embodiments of the present invention, by sound
Dielectric layer is set between source and sensor, which can change the velocity of sound that the sound that sound source is sent reaches sensor.It is former
Reason as previously mentioned, so, even if when the distance between the sensor of microphone array is smaller, the sound that is sent due to sound source
The velocity of sound that sound reaches sensor is different, thus can equally realize that the time of sound arrival sensor is different, and then realizes
Wave beam forming.
It is possible to further refer to microphone array 10 shown in FIG. 1, may be used also between sound source 20 and second sensor 112
With with the controllable second dielectric layer of density or thickness.
First medium layer is different from the density or thickness of second dielectric layer.
So, the accurate control that the time difference between adjacent sensor is reached to the sound that sound source is sent can be realized
System, improves the flexibility of microphone array size adjusting.
Further, as shown in figure 4, microphone array implementation method provided in an embodiment of the present invention can specifically include：
S401, sensor receive the sound from sound source, have dielectric layer between the sound source and sensor, and the dielectric layer is close
Degree or thickness are controllable.
The spacing of S402, detection first sensor and second sensor.
Correspondingly, step S302 is specifically as follows：
S403, when the spacing of first sensor and second sensor changes, adjust first medium layer density or
Thickness and/or the density or thickness for adjusting second dielectric layer, so that the sound letter that first sensor and second sensor receive
It is poor number to meet preset phase.
For example, multiple sensors of the microphone as microphone array of multiple mobile equipment can be respectively adopted, due to
Spacing between multiple sensors can change according to the spacing of mobile equipment and be changed, therefore when detection unit detects the first biography
When the spacing of sensor and second sensor reduces, in order to enable the voice signal that first sensor and second sensor receive meets
For default phase difference, it is necessary to improve the time difference that sound arrives separately at first sensor and second sensor, adjustment unit can be with
By adjusting the density or thickness of first medium layer or second dielectric layer to change the spread speed of sound in the dielectric layer, so as to
It is poor that the voice signal that realization first sensor and second sensor receive meets preset phase.
Using the microphone array of such a structure, by increasing dielectric layer between sound source and sensor, can control
The speed that sound processed is propagated in this section of space, without the distance between limiting sensor it is i.e. adjustable from sound source sounding to
Voice signal enters the time of sensor, so, overcomes the limitation to distance between sensor in microphone array, real
The arbitrary adjustment of existing microphone array size.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and foregoing program can be stored in a computer read/write memory medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
The various media that can store program code such as disk.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention described should be subject to the protection scope in claims.
Claims (3)
1. a kind of microphone array, the sensor for being used to receive the sound from sound source including at least two, which is characterized in that
There is dielectric layer between the sound source and the sensor；The dielectric layer is wholely set with the sensor；
The dielectric layer density or thickness are controllable；
The microphone array is connected with a controller, the controller according to an input condition control the dielectric layer density or
Thickness；
The sensor includes first sensor and second sensor；There is density between the first sensor and the sound source
Or the first medium layer that thickness is controllable；And/or have density or the thickness controllable between the second sensor and the sound source
Second dielectric layer, the first medium layer are different from the density or thickness of the second dielectric layer；The first sensor and institute
Stating the voice signal of second sensor reception, to meet preset phase poor, to realize Wave beam forming；
The microphone array further includes：Detection unit, for detecting between the first sensor and the second sensor
Away from；
The controller includes：Adjustment unit, the spacing for working as the first sensor and the second sensor become
During change, the density of the first medium layer or the density or thickness of thickness and/or the adjustment second dielectric layer are adjusted, so that
The voice signal that receives of the first sensor and the second sensor to meet the preset phase poor.
2. a kind of electronic equipment that microphone array is set, which is characterized in that the microphone array is classified as described in claim 1
Microphone array.
3. a kind of microphone array implementation method, the electronic equipment that microphone array is set applied to one, the microphone array
The sensor for being used to receive the sound from sound source including at least two, which is characterized in that including：
Sensor receives the sound from the sound source, has dielectric layer, the medium between the sound source and the sensor
Layer is wholely set with the sensor；The dielectric layer density or thickness are controllable；
The dielectric layer density or thickness are controlled according to an input condition；
The sensor includes first sensor and second sensor；There is density between the first sensor and the sound source
Or the first medium layer that thickness is controllable；And/or have density or the thickness controllable between the second sensor and the sound source
Second dielectric layer, the first medium layer are different from the density or thickness of the second dielectric layer；The first sensor and institute
Stating the voice signal of second sensor reception, to meet preset phase poor, to realize Wave beam forming；
The method further includes：Detect the spacing of the first sensor and the second sensor；
It is described according to an input condition dielectric layer density or thickness to be controlled to include：When the first sensor and described second
When the spacing of sensor changes, the density of the first medium layer or thickness and/or the adjustment second dielectric layer are adjusted
Density or thickness so that the voice signal that the first sensor and the second sensor receive meets the default phase
Potential difference.
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| CN201310250343.9A CN104244142B (en) | 2013-06-21 | 2013-06-21 | A kind of microphone array, implementation method and electronic equipment |
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| CN201310250343.9A CN104244142B (en) | 2013-06-21 | 2013-06-21 | A kind of microphone array, implementation method and electronic equipment |
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| CN104244142B true CN104244142B (en) | 2018-06-01 |
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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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1755112B1 (en) * | 2004-02-20 | 2008-05-28 | Sony Corporation | Method and apparatus for separating a sound-source signal |
-
2013
- 2013-06-21 CN CN201310250343.9A patent/CN104244142B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| CN104244142A (en) | 2014-12-24 |
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