CN101076203A - Audio-transmitter array for picking up signals of adjacent-field sound source - Google Patents
Audio-transmitter array for picking up signals of adjacent-field sound source Download PDFInfo
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- CN101076203A CN101076203A CN200710024401.0A CN200710024401A CN101076203A CN 101076203 A CN101076203 A CN 101076203A CN 200710024401 A CN200710024401 A CN 200710024401A CN 101076203 A CN101076203 A CN 101076203A
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Abstract
The invention comprises a group of full-directivity loud speakers arranged in an arc array; summarizing the signals from each loud speaker to get the array output signals at the center of arc. When capturing the signals from near sound field source, the invention can distinguish the signals from sound sources at different positions.
Description
Technical field
The present invention relates to a kind ofly has the microphone array of very strong inhibition ability, specifically a kind of microphone array that picks up the near field sound-source signal to far-field signal and other near-field signals.
Background technology
In fields such as vehicle mounted communication, mobile communication, man-machine interactions, sound source is positioned at the near-field region of microphone array.Microphone array can have bigger sensitivity by using beam-forming technology to the acoustic signals from certain specific direction or particular spatial location, reach and pick up required sound-source signal under the noise jamming environment.Existing near field microphone array beam-forming technology mainly contains 1) near field data independence beam-forming technology; 2) optimize beam-forming technology at the near field statistics of certain noise model.
Data independence beam-forming technology near field to the distribution of angle design appointment, picks up the sound-source signal of specified angle direction under the distance of an appointment, this method is not adjusted the distance and designed, and can't distinguish same direction different distance place sound-source signal.
The near field statistics is optimized beam-forming technology and is obtained at a certain noise and interference environment optimization array gain, and this noise and interference environment are had good performance, but same to the as broad as long ability of sound-source signal from same direction different distance place.
The near field beam-forming technology that exists can only be distinguished the sound-source signal of different directions at present, can not distinguish same direction different distance place sound-source signal, can not pick up the sound-source signal of a certain position, near field.
Summary of the invention
Can't pick up shortcomings such as assigned address sound-source signal at present relevant microphone array beam-forming technology, the purpose of this invention is to provide a kind of microphone array that picks up the near field sound-source signal, this microphone array can be distinguished the sound source of same direction diverse location, and picks up the sound-source signal of desired location.
The objective of the invention is to be achieved through the following technical solutions:
A kind of microphone array that picks up the near field sound-source signal is characterized in that: one group of microphone adopts the circular arc array structure, and direct addition obtains center of arc's place's array output signal to each road microphone signal.
Among the present invention, the microphone of described one group of omnidirectional is equally spaced to be distributed on the circular arc.
The present invention obtains the output signal of whole array to each road direct addition of the analog-to-digital microphone signal of process.
The circular arc array that the present invention uses the microphone spacing to equate obtains the output signal of array to the output signal addition of each microphone, can pick up center of arc's place's sound-source signal.
During operation, at first, be R at a radius, angle be [α, α] the circular arc equal intervals lay M
cIndividual omnidirectional microphone; Then, each road microphone signal addition is obtained the array output signal at center of arc place.
The present invention adopts a kind of new circular arc microphone array structure, and each road microphone signal addition is obtained array output signal.Can only distinguish the sound-source signal of different directions with microphone array technology in the prior art and compare, the present invention can distinguish the sound-source signal of diverse location, and the wave beam of formation has the ability of the same direction different distance of very strong difference place sound-source signal; And all it doesn't matter for the statistical property of array of the present invention and input signal and signal, and any noise jamming environment all has identical performance.The present invention adopts the circular arc array structure to pick up center of arc's place's sound-source signal, and far-field signal and other near-field signals are had very strong inhibition ability.Array coefficient of the present invention is fixed, and amount of calculation is little, and robustness is good, more easily realizes.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 (a) be the pick-up capability of circular array column space diverse location among the embodiment to the distribution map after center of arc's normalization, unit is dB.
Fig. 2 (b) is that the pick-up capability of circular array column space diverse location among another embodiment is to the distribution map after center of arc's normalization.
Embodiment
A kind of microphone array that picks up the near field sound-source signal of the present invention is seen 1, one group of M of accompanying drawing
c Individual microphone 1 adopts the circular arc array structure, and equally spaced to be placed on a radius be R, and angle be on the circular arc of [α, α], and direct addition obtains center of arc and locates array output signal through analog-to-digital microphone signal to each road.
This algorithm is at R=0.325m, α=90 °, M
C=7 o'clock, under the signal frequency of 1000Hz, analog result was seen accompanying drawing 2 (a), and this moment, far field and line of demarcation, near field probably were 2R
2/ λ ≈ 2R, be that the locus is thought less than 2R and is in the near field, the relative different of each position array output of research space does not consider to export absolute value, other position array output of space is located array output carrying out normalization to center of arc, this moment, center of arc place array output signal was 0dB, can obtain: array to the sound-source signal pick-up capability at center of arc place than big more than 10 dB of far-field position, more than the big several dB in other position, near field.Fig. 2 (b) is another group analog result, this moment R=0.325m, α=90 °, M
C=14, signal frequency is 2000Hz, and the sound-source signal pick-up capability at visible center of arc place is than more than still big more than 10 dB of far-field position, more than the big several dB in other position, near field.Center of arc's place's sound-source signal can be effectively picked up in analog result explanation, the present invention.
Claims (3)
1, a kind of microphone array that picks up the near field sound-source signal is characterized in that: one group of microphone (1) adopts the circular arc array structure, and direct addition obtains the array output signal at center of arc place to each road microphone signal.
2, the microphone array that picks up the near field sound-source signal according to claim 1 is characterized in that: equally spaced being distributed on the circular arc of the microphone of described one group of omnidirectional (1).
3, the microphone array that picks up the near field sound-source signal according to claim 1 is characterized in that: the output signal that each road direct addition of the analog-to-digital microphone signal of process is obtained whole array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710024401.0A CN101076203A (en) | 2007-06-15 | 2007-06-15 | Audio-transmitter array for picking up signals of adjacent-field sound source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710024401.0A CN101076203A (en) | 2007-06-15 | 2007-06-15 | Audio-transmitter array for picking up signals of adjacent-field sound source |
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| CN101076203A true CN101076203A (en) | 2007-11-21 |
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| CN200710024401.0A Pending CN101076203A (en) | 2007-06-15 | 2007-06-15 | Audio-transmitter array for picking up signals of adjacent-field sound source |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102308597A (en) * | 2009-02-03 | 2012-01-04 | 方头技术有限公司 | Conference microphone system |
| CN101662714B (en) * | 2009-07-28 | 2012-08-15 | 南京大学 | Microphone array designing method for locating pickup in complex sound field based on time reversal |
| CN105241544A (en) * | 2015-09-28 | 2016-01-13 | 南京航空航天大学 | Rotor noise source identification method based on near field sound array |
| CN105466553A (en) * | 2015-12-22 | 2016-04-06 | 东南大学 | Ballscrew noise measuring method based on microphone array |
| CN107331402A (en) * | 2017-06-19 | 2017-11-07 | 依偎科技（南昌）有限公司 | A kind of way of recording and sound pick-up outfit based on dual microphone |
| CN112373723A (en) * | 2020-11-20 | 2021-02-19 | 中国直升机设计研究所 | Rotor noise microphone array |
-
2007
- 2007-06-15 CN CN200710024401.0A patent/CN101076203A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102308597A (en) * | 2009-02-03 | 2012-01-04 | 方头技术有限公司 | Conference microphone system |
| CN102308597B (en) * | 2009-02-03 | 2014-09-17 | 方头技术有限公司 | Conference microphone system |
| CN101662714B (en) * | 2009-07-28 | 2012-08-15 | 南京大学 | Microphone array designing method for locating pickup in complex sound field based on time reversal |
| CN105241544A (en) * | 2015-09-28 | 2016-01-13 | 南京航空航天大学 | Rotor noise source identification method based on near field sound array |
| CN105466553A (en) * | 2015-12-22 | 2016-04-06 | 东南大学 | Ballscrew noise measuring method based on microphone array |
| CN105466553B (en) * | 2015-12-22 | 2019-01-29 | 东南大学 | A kind of ball screw assembly, noise measuring method based on microphone array |
| CN107331402A (en) * | 2017-06-19 | 2017-11-07 | 依偎科技（南昌）有限公司 | A kind of way of recording and sound pick-up outfit based on dual microphone |
| CN112373723A (en) * | 2020-11-20 | 2021-02-19 | 中国直升机设计研究所 | Rotor noise microphone array |
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Open date: 20071121 |