CN107948870A - Portable audio noise reduction system based on stereo microphone array - Google Patents
Portable audio noise reduction system based on stereo microphone array Download PDFInfo
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- CN107948870A CN107948870A CN201711368599.4A CN201711368599A CN107948870A CN 107948870 A CN107948870 A CN 107948870A CN 201711368599 A CN201711368599 A CN 201711368599A CN 107948870 A CN107948870 A CN 107948870A
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- microphone array
- noise reduction
- reduction system
- frequency processing
- audio frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of portable audio noise reduction system based on stereo microphone array, including microphone array, A/D Acquisition Circuits and DSP audio frequency processing circuits, microphone array includes multilayer microphone array layer of the arrangement for cone, the multi-faceted collection audio signal of energy, ensure beam position uniformity, the data aggregate of reception is handled by DSP audio frequency processing circuits, suppresses the interference in other directions, strengthen the signal-to-noise ratio of audio signal, finally realize the noise reduction of audio signal.The system volume size is smaller, has expanded the applicability of system significantly, may act on enhancing and the noise reduction of small-signal.
Description
Technical field
The present invention relates to field of audio devices, and in particular to the portable audio noise reduction system based on stereo microphone array
System.
Background technology
With the development of intelligent audio treatment technology, audio signal needs to be gathered in real time, to microphone language also
Former degree requirement becomes higher.The audio that traditional single microphone collects is usually associated with the problems such as ambient noise is big.Utilize multiple wheats
The microphone array of gram wind composition can reduce environmental noise, reduce distortion, and domestic microphone array column processing mainly collects at present
In in the combination of array process algorithms and speech processes, research emphasis far field processing etc. scene, a whole set of processing equipment is huge,
It is not appropriate for the application of portable mobile apparatus.
The content of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of based on the portable of stereo microphone array
Audio defeat system, realizes that portable devices formula minimizes while noise reduction is met.
The technical solution adopted by the present invention to solve the technical problems includes：
Portable audio noise reduction system based on stereo microphone array, including
Microphone array, for carrying out audio collection, the microphone array includes multilayer microphone of the arrangement for cone
Array layer, is provided with one or more microphones in the microphone array layer；
A/D Acquisition Circuits, the output terminal of A/D Acquisition Circuits connection microphone array, A/D Acquisition Circuits are by microphone
The analog signal of array output is converted into digital signal and carries out serioparallel exchange；
DSP audio frequency processing circuits, the DSP audio frequency processing circuits connect A/D Acquisition Circuits, DSP audio frequency processing circuits pair
The digital signal of A/D Acquisition Circuits output carries out audio frequency process, exports I2S digital signals.
The portable audio noise reduction system based on stereo microphone array of the design, utilizes different wheats on microphone array
The spatial information of gram wind, the combined signal processing collected to each microphone, so as to strengthen the signal of specific direction, and suppresses
The interference in other directions, i.e. Wave beam forming, realize the signal acquisition of orientation, strengthen the signal-to-noise ratio of audio signal.
Further as above-mentioned technical proposal is improved, and the DSP audio frequency processing circuits use TMS320C5x family chips
As main control chip, TMS320C5x family chips are the main chip of DSP audio frequency process.
Further as above-mentioned technical proposal is improved, and the DSP audio frequency processing circuits are using ARM family chips as master
Chip is controlled, audio conversion and control is realized by the pattern of ARM+DSP.
Further as above-mentioned technical proposal is improved, and the DSP audio frequency processing circuits are connected with Bluetooth transmission chip, institute
State Bluetooth transmission chip and send a signal to bluetooth headset.
Further as above-mentioned technical proposal is improved, and the Bluetooth transmission chip is CC2640 chips.
Further as above-mentioned technical proposal is improved, and the DSP audio frequency processing circuits, which are connected with, changes audio signal
For the DA conversion chips of analog signal, the DA conversion chips connection earphone or loudspeaker.
Further as above-mentioned technical proposal is improved, the DA conversion chips by audio amplifier circuit connect earphone or
Person's loudspeaker.
Further as above-mentioned technical proposal is improved, and the DA conversion chips are PCM5122 chips.
Further as above-mentioned technical proposal is improved, when being provided with multiple microphones in the microphone array layer, institute
Microphone is stated to be evenly distributed in circumference or equilateral polygon.
The beneficial effects of the invention are as follows：
The present invention provides a kind of portable audio noise reduction system based on stereo microphone array, including circular Mike
Wind array, A/D Acquisition Circuits and DSP audio frequency processing circuits, microphone array include multilayer microphone array of the arrangement for cone
Layer, the multi-faceted collection audio signal of energy, and ensure beam position uniformity, the data by DSP audio frequency processing circuits to reception
Combined Treatment, suppresses the interference in other directions, strengthens the signal-to-noise ratio of audio signal, finally realizes the noise reduction of audio signal.This is
Volume size of uniting is smaller, has expanded the applicability of system significantly, may act on enhancing and the noise reduction of small-signal.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the functional block diagram of the portable audio noise reduction system based on stereo microphone array of the present invention.
Fig. 2 is a kind of layout viewing of microphone array.
Fig. 3 is the layout viewing of another microphone array.
Embodiment
The portable audio noise reduction system based on stereo microphone array of the present invention is illustrated below in conjunction with the accompanying drawings.
Reference Fig. 1, the present invention provides a kind of portable audio noise reduction system based on stereo microphone array, including according to
Microphone array 1, A/D Acquisition Circuits 2 and the DSP audio frequency processing circuits 3 of secondary connection.
The microphone array 1 is used to carry out audio collection, and microphone array 1 includes multilayer microphone of the arrangement for cone
Array layer, is provided with one or more microphones 10 in the microphone array layer.As shown in Fig. 2, the microphone array layer
Formation can be circle, microphone 10 is uniformly distributed circumferentially, between each microphone 10 is on the circumference of concentric circles and waits
Away from guarantee beam position uniformity.As shown in figure 3, the formation of the microphone array layer can also be square, 10 row of microphone
Square formation is classified as, can equally play identical effect, in addition, microphone 10 can also be arranged as other equilateral polygons.
The analog signal that microphone array 1 exports is converted into digital signal and is gone here and there and turned by the A/D Acquisition Circuits 2
Change, then be output to DSP audio frequency processing circuits 3.
The digital signal that the DSP audio frequency processing circuits 3 export A/D Acquisition Circuits 2 carries out audio frequency process, final output
I2S digital signals.Preferably, the DSP audio frequency processing circuits 3 use TMS320C5x family chips as main control chip；Except this
Outside, the DSP audio frequency processing circuits 3 can also use ARM family chips to pass through the pattern of ARM+DSP as main control chip
Realize audio conversion and control.
DSP audio frequency processing circuits 3 carry out following process processing to the signal collected：Beamforming algorithm is used first,
12 channel virtual microphones of a 360 degrees omnidirection are established, the virtual microphone of each passage strengthens corresponding 30 degree of angle sides
Sound source signal in position, the sound source signal in other orientation that decay；Again, using ASNR algorithms, to the source of sound being processed in passage
Adaptive noise reduction is carried out, exports the sound after stable noise reduction；Finally, audio is handled using MSS multi-source selection algorithms,
Realize that automatic speech orientation follows, while audio is identified in the speech recognition library that can be provided by DSP producers, Ke Yishi
The function of now automatically waking up.
In addition, the DSP audio frequency processing circuits 3 are connected to Bluetooth transmission chip 4 and DA conversion chips 6.The indigo plant
Tooth transmitting chip 4 is CC2640 chips, and I2S digital signals are sent to bluetooth headset 5 and played out by Bluetooth transmission chip 4.Institute
State after audio signal is converted to analog signal by DA conversion chips 6, amplify by audio amplifier circuit 7, then by earphone or loudspeaker
Play out, the DA conversion chips 6 be preferably PCM5122 chips.
The portable audio noise reduction system based on stereo microphone array of the present invention, microphone array include arrangement for cone
The multilayer microphone array layer of body, the multi-faceted collection audio signal of energy, and ensure beam position uniformity；At DSP audios
Reason circuit realizes the data of reception the Combined Treatment of Wave beam forming processing and audio defeat algorithm, suppresses the dry of other directions
Disturb, strengthen the signal-to-noise ratio of audio signal, finally realize the noise reduction of audio signal, due to being the effect of single-chip processing, greatly
System power dissipation and integrated circuit volume are reduced, makes system bulk size smaller, has expanded the applicability of the system significantly, can
Act on enhancing and the noise reduction of small-signal.
In addition, the system has further the advantage that：Governor circuit uses TMS320C5x family chips, can also be changed to
The framework of ARM+DSP, has very powerful flexibility in microphone processing system；The way of output of the system is I2S numerals
Interface exports, and can realize online processing, real-time Transmission, and whole processing procedure uses full digital processing, reduces analog circuit band
The distortion effect come.
Above concrete structure and dimension data are that presently preferred embodiments of the present invention is illustrated, but present invention wound
Make and be not limited to the embodiment, those skilled in the art can also make kind on the premise of without prejudice to spirit of the invention
The equivalent variations or replacement, these equivalent deformations or replacement of kind are all contained in the application claim limited range.
Claims (9)
1. the portable audio noise reduction system based on stereo microphone array, it is characterised in that including
Microphone array, for carrying out audio collection, the microphone array includes multilayer microphone array of the arrangement for cone
Layer, it is provided with one or more microphones in the microphone array layer；
A/D Acquisition Circuits, the output terminal of A/D Acquisition Circuits connection microphone array, A/D Acquisition Circuits are by microphone array
The analog signal of output is converted into digital signal and carries out serioparallel exchange；
DSP audio frequency processing circuits, the DSP audio frequency processing circuits connect A/D Acquisition Circuits, and DSP audio frequency processing circuits adopt A/D
The digital signal of collector output carries out audio frequency process, exports I2S digital signals.
2. the portable audio noise reduction system according to claim 1 based on stereo microphone array, it is characterised in that institute
DSP audio frequency processing circuits are stated using TMS320C5x family chips as main control chip.
3. the portable audio noise reduction system according to claim 1 based on stereo microphone array, it is characterised in that institute
DSP audio frequency processing circuits are stated using ARM family chips as main control chip.
4. the portable audio noise reduction system according to any one of claims 1 to 3 based on stereo microphone array, its feature
It is, the DSP audio frequency processing circuits are connected with Bluetooth transmission chip, and the Bluetooth transmission chip sends a signal to bluetooth ear
Machine.
5. the portable audio noise reduction system according to claim 4 based on stereo microphone array, it is characterised in that institute
It is CC2640 chips to state Bluetooth transmission chip.
6. the portable audio noise reduction system according to any one of claims 1 to 3 based on stereo microphone array, its feature
It is, the DSP audio frequency processing circuits are connected with the DA conversion chips for audio signal being converted to analog signal, the DA conversions
Chip connects earphone or loudspeaker.
7. the portable audio noise reduction system according to claim 6 based on stereo microphone array, it is characterised in that institute
State DA conversion chips and earphone or loudspeaker are connected by audio amplifier circuit.
8. the portable audio noise reduction system according to claim 6 based on stereo microphone array, it is characterised in that institute
It is PCM5122 chips to state DA conversion chips.
9. the portable audio noise reduction system according to claim 1 based on stereo microphone array, it is characterised in that institute
State when being provided with multiple microphones in microphone array layer, the microphone is evenly distributed in circumference or equilateral polygon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711368599.4A CN107948870A (en) | 2017-12-18 | 2017-12-18 | Portable audio noise reduction system based on stereo microphone array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711368599.4A CN107948870A (en) | 2017-12-18 | 2017-12-18 | Portable audio noise reduction system based on stereo microphone array |
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| Publication Number | Publication Date |
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| CN107948870A true CN107948870A (en) | 2018-04-20 |
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| CN201711368599.4A Pending CN107948870A (en) | 2017-12-18 | 2017-12-18 | Portable audio noise reduction system based on stereo microphone array |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110099330A (en) * | 2019-06-03 | 2019-08-06 | 广州由我科技股份有限公司 | A kind of earphone, earphone system and earphone charging system |
| CN110797042A (en) * | 2018-08-03 | 2020-02-14 | 杭州海康威视数字技术股份有限公司 | Audio processing method, device and storage medium |
| CN113720544A (en) * | 2021-08-16 | 2021-11-30 | 天津大学 | Weak sound wave or tiny gas leakage detection system and method |
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| JP2014127737A (en) * | 2012-12-25 | 2014-07-07 | Jvc Kenwood Corp | Image pickup device |
| CN106775572A (en) * | 2017-03-30 | 2017-05-31 | 联想(北京)有限公司 | Electronic equipment and its control method with microphone array |
| CN207783121U (en) * | 2017-12-18 | 2018-08-28 | 珠海爱珂索移动医疗科技有限公司 | portable audio noise reduction system based on stereo microphone array |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWM330707U (en) * | 2007-11-08 | 2008-04-11 | Univ Southern Taiwan | Audio extractor using rectangle microphone array |
| CN101778330A (en) * | 2009-12-30 | 2010-07-14 | 南京信息工程大学 | Mobile phone platform-based array microphone hearing aid and control method thereof |
| CN202773062U (en) * | 2012-09-22 | 2013-03-06 | 方楠 | High signal-to-noise ratio tracking directional sound collecting device |
| JP2014127737A (en) * | 2012-12-25 | 2014-07-07 | Jvc Kenwood Corp | Image pickup device |
| CN106775572A (en) * | 2017-03-30 | 2017-05-31 | 联想(北京)有限公司 | Electronic equipment and its control method with microphone array |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797042A (en) * | 2018-08-03 | 2020-02-14 | 杭州海康威视数字技术股份有限公司 | Audio processing method, device and storage medium |
| CN110797042B (en) * | 2018-08-03 | 2022-04-15 | 杭州海康威视数字技术股份有限公司 | Audio processing method, device and storage medium |
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| CN113720544A (en) * | 2021-08-16 | 2021-11-30 | 天津大学 | Weak sound wave or tiny gas leakage detection system and method |
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