CN108712694A - The method for forming directive property in space using the evenly distributed microphone of planar array - Google Patents
The method for forming directive property in space using the evenly distributed microphone of planar array Download PDFInfo
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- CN108712694A CN108712694A CN201810480256.5A CN201810480256A CN108712694A CN 108712694 A CN108712694 A CN 108712694A CN 201810480256 A CN201810480256 A CN 201810480256A CN 108712694 A CN108712694 A CN 108712694A
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- evenly distributed
- miaow
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- directive property
- planar array
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010606 normalization Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010010 raising Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000010415 tropism Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Method that the miaow core evenly distributed using planar array form directive property in space that the invention discloses a kind of, it is characterized in that by several identical miaow cores, it is evenly distributed according to array in the same plane, the sound source of common face forward, the audio electrical signal of each miaow core output, after oversampling circuit overlap-add procedure, the electric signal of gained just has specific space directional property.Using the method for the present invention, by forming directional property so that these miaow cores can pick up the sound of specific direction and the voice signal in other directions of decaying；Meanwhile achieving the effect that shortening miaow bar, even without miaow bar.In addition, the method for the evenly distributed several miaow cores of planar array, can simplify, the appearance design of beautify product.
Description
Technical field
The present invention relates to a kind of sound pickup methods, and in particular to a kind of microphone evenly distributed using planar array exists
The method that space forms directive property, belongs to audio signal processing technique field.
Background technology
Under normal conditions, microphone and conference system all pick up sound using single miaow core device, although miaow core itself
Directive property it can be selected that still pickup distance it is shorter, generally require using miaow bar come approach sound source (hereinafter referred to as " miaow core+miaow
Bar " method), shorten pickup distance.
And miaow bar is used, the size of microphone can be increased, influence beauty.In addition, using miaow bar, for the direction of microphone
There is no substantive raisings for performance.
Invention content
The purpose of the present invention is to provide a kind of utilization planar array that can be improved pickup capacity, simplify product is evenly distributed
Microphone space formed directive property method.
The invention is realized in this way：
Using the evenly distributed miaow core of planar array space formed directive property method, be by several identical miaow cores,
It is evenly distributed according to array in the same plane, the sound source of common face forward, the audio electrical signal of each miaow core output, warp
After oversampling circuit overlap-add procedure, the electric signal of gained just has specific space directional property.
Further scheme is：
The miaow core quantity is that (2M+1) × (2N+1) is a, and M, N are the half of positive integer or positive integer.
Further scheme is：
The miaow core quantity is that 3 rows × 5 arrange or 3 arrange × 5 rows.
Using the method for the present invention, pass through and form directional property so that these miaow cores can pick up the sound, simultaneously of specific direction
Decay the voice signal in other directions；Meanwhile achieving the effect that shortening miaow bar, even without miaow bar.
In addition, the method that planar array column arranges several miaow cores, can simplify, the appearance design of beautify product.
Description of the drawings
Fig. 1 is the microphone array schematic diagram of uniform plane of the present invention distribution；
Fig. 2 is that the synthesis of uniform plane distributed microphones array exports schematic diagram；
Fig. 3 is the normalization directive property schematic diagram that one embodiment of the invention generates in space.
Specific implementation mode
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
As shown in Fig. 1, the operation principle of the present invention is that：
Several miaow cores regularly arrange in the plane, the common sound wave for receiving front.Assuming that one shared (2M+1) ×
(2N+1) only identical miaow core unit, directive property are all omnidirectional's (or being non-directive), between adjacent miaow core unit
Away from being row respectively away from d, line-spacing l, sound source S deviates miaow core forward direction angle, θ, then, the output electric signal of whole miaow cores, by synthesis
After exporting (such as Fig. 2), signal characteristic is：
Maximum gain Gmax=20log10[(2N+1)(2M+1)] (Eq.1)
Normalize directive property
In above formula, ω indicates the angular frequency (unit of signal：Radian per second), i.e. the π of ω=2 f.F is sound frequency (unit：It is conspicuous
Hereby)；C is speed of sound (unit：Meter per second)；J is mathematics imaginary unit, j2=-1；r0It is sound source S at a distance from array center；θ
It is r0Distance vector and Z coordinate axis angle (unit：Radian)；It is r0The projection and x-axis of the vector at place in x/y plane
Angle (unit：Radian)；In attached drawing 1, r is the actual range of sound source S and some specific miaow core in array.N, m is that normalization refers to
The number of miaow core unit is corresponded in tropism expression formula, when being superimposed respectively by row, column.
Fig. 3 is the directional property that 3 × 5=15 miaow core evenly distributed (line-spacing 2cm, row are away from 3cm) generates in space.
Therefrom as it can be seen that after the quantity of miaow core and spacing determination, as frequency increases, directive property gradually becomes sharply.
If each miaow core unit itself also has directive property, the directive property of synthesized output signal is just more sharp.
According to (Eq.1), the maximum gain (comparing more single miaow core) of 15 miaow cores, is 23.5dB.Gain increases, to add
Big pickup distance, cancellation " miaow bar " create condition.
So the array by multiple miaow cores in plane space arranges, pickup effect is enhanced, gain is not only increased, but also
Space directivity is strengthened, desired sound can be picked up, it is inhibited to noise.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiment of the present invention are not limited by the above embodiments, it should be appreciated that people in the art
Member can be designed that a lot of other modification and implementations, these modifications and implementations will be fallen in principle disclosed in the present application
Within scope and spirit.
Claims (4)
1. the method for forming directive property in space using the evenly distributed microphone of planar array, it is characterised in that be by several phases
Same miaow core, evenly distributed according to array in the same plane, the sound source of common face forward, the audio of each miaow core output
Electric signal, after oversampling circuit overlap-add procedure, the electric signal of gained just has specific space directional property.
2. the method that the microphone for utilizing planar array evenly distributed according to claim 1 forms directive property in space,
It is characterized in that：
The miaow core quantity is that (2M+1) × (2N+1) is a, and M, N are the half of positive integer or positive integer.
3. the method that the microphone for utilizing planar array evenly distributed according to claim 1 forms directive property in space,
It is characterized in that：
The maximum gain of the electric signal of gained is Gmax=20log10[(2N+1)(2M+1)]。
4. the method that the microphone for utilizing planar array evenly distributed according to claim 1 forms directive property in space,
It is characterized in that：
The normalization directive property of the electric signal of gained is
Wherein, ω indicates the angular frequency of signal, unit：The π f of radian per second, i.e. ω=2；F is sound frequency, unit：Hertz；C is
Speed of sound, unit：Meter per second；J is mathematics imaginary unit, j2=-1；r0It is sound source S at a distance from array center；θ is r0Away from
Angle from vector and Z coordinate axis, unit：Radian；It is r0The vector at place is in the projection of x/y plane and the angle of x-axis, list
Position：Radian.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480256.5A CN108712694A (en) | 2018-05-18 | 2018-05-18 | The method for forming directive property in space using the evenly distributed microphone of planar array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810480256.5A CN108712694A (en) | 2018-05-18 | 2018-05-18 | The method for forming directive property in space using the evenly distributed microphone of planar array |
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| CN108712694A true CN108712694A (en) | 2018-10-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1826019A (en) * | 2005-02-24 | 2006-08-30 | 索尼株式会社 | Microphone apparatus |
| KR100791116B1 (en) * | 2006-11-03 | 2008-01-02 | 주식회사 서비전자 | Directional microphone device |
| CN101222785A (en) * | 2007-01-11 | 2008-07-16 | 美商富迪科技股份有限公司 | Small array microphone apparatus and beam forming method thereof |
| CN201639751U (en) * | 2010-03-11 | 2010-11-17 | 成都丹玛尼科技有限公司 | Fixed-direction and fixed-distance voice collecting system based on multi-microphone array |
| CN104754471A (en) * | 2013-12-30 | 2015-07-01 | 华为技术有限公司 | Microphone array based sound field processing method and electronic device |
| CN107274910A (en) * | 2017-05-17 | 2017-10-20 | 宁波桑德纳电子科技有限公司 | The supervising device and audio/video linkage method of a kind of audio/video linkage |
-
2018
- 2018-05-18 CN CN201810480256.5A patent/CN108712694A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1826019A (en) * | 2005-02-24 | 2006-08-30 | 索尼株式会社 | Microphone apparatus |
| KR100791116B1 (en) * | 2006-11-03 | 2008-01-02 | 주식회사 서비전자 | Directional microphone device |
| CN101222785A (en) * | 2007-01-11 | 2008-07-16 | 美商富迪科技股份有限公司 | Small array microphone apparatus and beam forming method thereof |
| CN201639751U (en) * | 2010-03-11 | 2010-11-17 | 成都丹玛尼科技有限公司 | Fixed-direction and fixed-distance voice collecting system based on multi-microphone array |
| CN104754471A (en) * | 2013-12-30 | 2015-07-01 | 华为技术有限公司 | Microphone array based sound field processing method and electronic device |
| CN107274910A (en) * | 2017-05-17 | 2017-10-20 | 宁波桑德纳电子科技有限公司 | The supervising device and audio/video linkage method of a kind of audio/video linkage |
Non-Patent Citations (1)
| Title |
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| 杨益，闫兆立，温周斌，冯海泓，付奇: "超指向性扬声器的阵列设计与研究", 《声学技术》 * |
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Application publication date: 20181026 |