CN108449687B - A kind of conference system of multi-microphone array noise reduction - Google Patents
A kind of conference system of multi-microphone array noise reduction Download PDFInfo
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- CN108449687B CN108449687B CN201810203366.7A CN201810203366A CN108449687B CN 108449687 B CN108449687 B CN 108449687B CN 201810203366 A CN201810203366 A CN 201810203366A CN 108449687 B CN108449687 B CN 108449687B
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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
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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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
- H04R2410/00—Microphones
- H04R2410/05—Noise reduction with a separate noise microphone
Abstract
A kind of conference system of multi-microphone array noise reduction, the system can be used existing or newly-increased microphone and carry out voice and Noise Acquisition, noise reduction process, without additionally matching microphone, to reduce total cost of ownership using integration and integrated design.The system can carry out noise reduction process using dual microphone noise reduction or multi-microphone array noise reduction schemes, and dual microphone noise reduction schemes can provide 2 kinds of different algorithms, multi-microphone array noise reduction schemes can provide 3 kinds of different algorithms, in multi-microphone array noise reduction schemes, can three kinds of situations such as linear array, rectangular array, circular array the method for different selection noise reduction microphones is provided.
Description
Technical field
The present invention relates to public address field, especially a kind of conference system of multi-microphone array noise reduction.
Background technique
Sound reinforcement system can be divided into four classes: indoor sound reinforcement system, auditorium sound reinforcement system, public address system and dedicated meeting system
System.Wherein the application scenarios of dedicated conference system are very common, and most commonly seen has: certain general Party branch or leading Party group party member concentrate on one
It rises and holds a meeting, learn the theoretical knowledge of party；Certain organ specialized engineering personnel get together meeting, arrange new task；
The middle administrative staff of Bureau of Education or school holds a meeting in meeting room, conveys and implement higher level's conference key agreement etc..
Conference system influences the use of conference system since application environment complexity, noise are inevitably generated.Using
It is a good solution that conference system, which has microphone to carry out noise reduction, and dual microphone noise reduction solution can be used,
Also multi-microphone array noise reduction solution can be used.
A kind of conference system of multi-microphone array noise reduction can be used existing or newly-increased microphone and carry out voice and make an uproar
The acquisition of sound, noise reduction, without additionally matching microphone.Because multiple microphones also can be possessed (i.e. in general existing conference system
" old microphone "), these microphones include simulation microphone and digital microphone, if it is possible to access multi-microphone array drop
In the conference system made an uproar, then total cost of ownership can be saved.
These " old microphones " can be simulation microphone, be also possible to digital microphone, a kind of for simulating microphone
The conference system of multi-microphone array noise reduction can digitize the signal that it is acquired, with compatible analog microphone.
A kind of conference system of multi-microphone array noise reduction can use dual microphone noise reduction schemes, can also use more
Noise reduction of microphone array scheme, and respectively there are many different algorithms for choosing for dual microphone noise reduction and multi-microphone noise reduction schemes
It selects.
Conference system traditional at present has the disadvantage in that
It cannot be compatible with existing microphone (i.e. " old microphone "), if using new conference system, existing Mike
Wind cannot all reuse, and cause the waste of resource.
Do not have decrease of noise functions, noise problem seriously affects the use of conference system.
It is only capable of providing the function of dual microphone noise reduction or multi-microphone array noise reduction, moreover, using dual microphone noise reduction
Or when multi-microphone array noise reduction, need extraly to configure special and professional microphone, increases expense.
When carrying out noise reduction using dual microphone, only a kind of algorithm, often effect and bad sometimes, it is desirable to provide different
Algorithm is to obtain better effect.
When carrying out noise reduction using multi-microphone array, only a kind of algorithm, often effect and bad sometimes, it is desirable to provide no
Same algorithm is to obtain better effect.
When using multi-microphone noise reduction schemes, only a kind of method for selecting noise reduction microphone, effect is bad sometimes, needs
The method of different selection noise reduction microphones is provided to obtain better effect.
Therefore, design one kind can be used existing (i.e. " old microphone ") or newly-increased microphone carry out voice and Noise Acquisition,
Noise reduction process without additionally matching microphone, and can use dual microphone or multi-microphone array noise reduction schemes, and
Dual microphone or multi-microphone array noise reduction have different algorithms available, in application multi-microphone array noise reduction schemes,
It is very necessary that selection noise reduction microphone, which possesses a kind of conference system of multi-microphone array noise reduction of a variety of distinct methods,.
Closest to the analysis of technology and comparison in existing situation.
Currently, immediate technical solution in existing situation are as follows: Authorization Notice No. is a kind of " more wheats of CN102306496B
Gram wind array noise removing method, apparatus and system " (hereinafter referred " documents 1 "), Authorization Notice No. be
A kind of " noise reduction of microphone array control method and device " (hereinafter referred " documents 2 ") of CN102111697B.
Documents 1, documents 2 have been all made of microphone array and have carried out noise elimination, noise reduction control, but compare text
Part 1 and documents 2 and the present invention have very big difference.
Documents 1, " a kind of multi-microphone array noise cancellation method, dress that Authorization Notice No. is CN102306496B
Set and system ", describe a kind of multi-microphone array noise cancellation method, apparatus and system, method includes: according to described more
The quantity for the different spacing that each pair of microphone of microphone array is constituted, is divided into Whole frequency band the subband of identical quantity；It will not
In signal decomposition to corresponding subband with each pair of microphone of spacing, and the decomposed signal in corresponding subband is carried out adaptive
Noise reduction is answered, the signal after obtaining each subband noise reduction；Signal after each subband noise reduction is synthesized, to obtain institute
State signal of the multi-microphone array after Whole frequency band noise reduction.And it is of the invention, noise reduction can be carried out using dual microphone, can also be adopted
Noise reduction is carried out with multi-microphone array, and there are many method and algorithm, a variety of methods and algorithm and 1 noise of documents are eliminated
Method is not identical, and the present invention can also utilize existing microphone, including simulation microphone and digital microphone.Comparison text
The method that noise is eliminated in part 1 is only one of multi-microphone array noise-reduction method of the present invention-Subspace algorithm.
Documents 2, " a kind of noise reduction of microphone array control method and the dress that Authorization Notice No. is CN102111697B
Set ", a kind of noise reduction of microphone array control method and noise reduction of microphone array control device are described, microphone array is mainly utilized
Column directly obtain the attitude information of sound, so that accurately control sef-adapting filter updates filtering, eliminate noise, improve
Signal-to-noise ratio.And it is of the invention, noise reduction can be carried out using dual microphone, and noise reduction can also be carried out using multi-microphone array, and
There are many method and algorithm, a variety of methods and algorithm and 1 noise cancellation method of documents be not identical, and the present invention can also
Enough utilize existing microphone, including simulation microphone and digital microphone.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of meeting systems of multi-microphone array noise reduction
System is able to use existing or newly-increased microphone and carries out voice and Noise Acquisition, noise reduction process, without additionally matching microphone,
Reduce total cost of ownership；The conference system can use dual microphone noise reduction schemes, can also use multi-microphone noise reduction schemes；
The dual microphone noise reduction schemes of the conference system have 2 kinds of algorithms, and multi-microphone noise reduction schemes have 3 kinds of algorithms；The conference system exists
Under multi-microphone array noise reduction mode, noise reduction microphone is selected to possess a variety of different methods.
A kind of conference system of multi-microphone array noise reduction uses integration and integrated design, and system can be voluntarily
With microphone, also can be used the microphone (i.e. " old microphone ") in existing conference system, including simulation microphone and
Digital microphone.
A kind of conference system of multi-microphone array noise reduction, wherein the signal of all processing is all digital signal, for mould
Quasi- microphone signal, can provide digitized function, so as to compatible multiple types microphone, reduce total cost of ownership.
A kind of conference system of multi-microphone array noise reduction can carry out noise reduction using dual microphone mode and algorithm,
Noise reduction can be carried out using multi-microphone array mode and algorithm.
For dual microphone noise reduction mode, conference system can provide 2 kinds of algorithms.
For multi-microphone array noise reduction mode, conference system can provide 3 kinds of algorithms.
Under multi-microphone array noise reduction mode, multiple microphones of system can be according to linear array, rectangular array or circle
The arrangement of shape array, and the selection method of different noise reduction microphones can be provided.
The present invention, using integration and integrated design, can be used existing compared with traditional conference system
Microphone reduces total cost of ownership.Dual microphone noise reduction can be used, multi-microphone array noise reduction can also be used, and
For different situation application many algorithms.Connection and use it is very simple, it is only necessary to be simply to set, reduce study at
This, does not also waste learning time.User is not necessarily to professional technique, hand can be gone up in the very short time and grasped.
Detailed description of the invention
A kind of conference system working principle diagram of multi-microphone array noise reduction of Fig. 1
Fig. 2 linear array conference system structure chart
Fig. 3 rectangular array conference system structure chart
Fig. 4 circular array conference system structure chart
Label declaration
100: microphone adaptation module
200: microphone digital module
300: microphone denoising module
301: dual microphone noise reduction selector
302: dual microphone de-noising processor
303: multi-microphone noise reduction selector
304: multi-microphone de-noising processor
……
Specific embodiment
It is a kind of working principle diagram of the conference system of multi-microphone array noise reduction, microphone adaptation module 100 such as Fig. 1
Multiple microphones can be accessed, these microphones can be existing (i.e. original " old microphone ") or newly-increased microphone, lead to
It crosses microphone adaptation module 100 and accesses these microphones, and multiple types microphone can be compatible with, including simulation microphone sum number
Word microphone.
After microphone passes through 100 accessing conference system of microphone adaptation module, microphone digital module 200 will be connected.
This is because the microphone of access has plenty of existing (i.e. original " old microphone "), also have plenty of newly-increased, has plenty of mould
Quasi- microphone, and the signal of all processing of conference system is all digital signal, and simulation microphone is needed through microphone number
Word module 200 is digitized, and the processing of signal, the process including noise reduction can be carried out.
There are two types of noise reduction mode, dual microphone noise reduction mode or multi-microphone array noise reduction modes for conference system, by wheat
Gram wind noise reduction module 300 is realized.
When conference system is under dual microphone noise reduction mode, main Mike is selected by dual microphone noise reduction selector 301
Wind (i.e. the microphone of acquisition spokesman speech) and noise reduction microphone, and carried out at noise reduction by dual microphone noise reduction process 302
Reason, application and execution including algorithm.It has 2 kinds of methods and algorithm, specifically:
Method 1 specifically: when some microphone M1 is in speech mode, neighboring microphones M2 (left or right side) will be certainly
Dynamic to be opened, microphone M1 and neighboring microphones M2 acquire the sound of spokesman and the noise of surrounding simultaneously, obtain 4 altogether at this time
Kind sound wave: Sm1 indicates that the sound of the spokesman of microphone M1 acquisition, Nm1 indicate the noise around microphone M1 acquisition, Sm2
Indicate that the sound of the spokesman of microphone M2 acquisition, Nm2 indicate the noise around microphone M2 acquisition；Because due to surrounding
Noise relative to spokesman sound all far from microphone M1 and microphone M2, therefore Nm1=Nm2, by noise reduction chip into
Row Difference Calculation obtains Nv=Nm1-Nm2=0, i.e., eliminates noise；Meanwhile spokesman is closer from microphone M1, from microphone
Farther out, therefore Sm1 > Sm2 carries out Difference Calculation by noise reduction chip to M2, obtains Sv=Sm1-Sm2, and Sv is after eliminating noise
Spokesman sound, but volume is smaller, is amplified；
Method 2 specifically: when some microphone M1 is in speech mode, neighboring microphones M2 (left or right side) will be certainly
Dynamic to be opened, microphone M1 and neighboring microphones M2 acquire the sound of spokesman and the noise of surrounding, microphone M1 and wheat simultaneously
The sound of the spokesman of gram wind M2 acquisition can about 6dB intensity difference, noise reduction chip can use microphone M1 and microphone M2
The alternative sounds being collected into are handled, and the sound wave opposite with noise can be automatically generated, and are used to active offset noise；
When conference system is under multi-microphone array noise reduction mode, select to lead by multi-microphone noise reduction selector 303
Microphone (i.e. the microphone of acquisition spokesman speech) and noise reduction microphone, and dropped by multi-microphone noise reduction process 304
It makes an uproar processing, including the application and execution for how selecting noise reduction microphone and algorithm.
Under multi-microphone array noise reduction mode, the method that selects noise reduction microphone specifically: a certain in multiple microphones
As main microphon when microphone M1 is in speech mode, in addition more microphone M2, M3, M4 ... Mn can be used as auxiliary
Microphone, and any x microphone can be selected as noise reduction auxiliary microphone from this n-1 auxiliary microphone, and drop
Make an uproar microphone selection method it is different, in which: for the conference system of linear array arrangement, x wheat can be randomly selected
Gram wind can also select microphone using following rule: if microphone M1 is in the both ends of linear array, need to one party
To selection microphone, midfeather int (n/x) microphone；If microphone M1 is not at the both ends of linear array, sight
All microphones in array are closed loop, and two-way choice microphone respectively, are spaced int (n/x) microphone, wherein int is
Bracket function；For the conference system of rectangular array, x microphone can be randomly selected, can also be made with microphone M1
For starting point, two-way choice microphone, regular respectively are as follows: interval int (n/x) microphone, wherein int is bracket function；It is right
In the conference system of circular array arrangement, x microphone can be randomly selected, it can also be using microphone M1 as starting point, respectively
Two-way choice microphone, rule are as follows: interval int (n/x) microphone, wherein int is bracket function.
Under multi-microphone array noise reduction mode, noise elimination can be carried out using different algorithms, moreover, different
Algorithm is selected for user, specifically: for cubicle scene, noise reduction is preferentially carried out using Near-field beamforming algorithm
Processing；There is the scene of original microphone for access, noise reduction process is preferentially carried out using fixed beam formation algorithm；For it
His situation, can carry out noise reduction process using Subspace algorithm.
Early in 2000, industry and proposed far field beam for the research just awfully hot door always in microphone denoising field
Formation algorithm, mixing near field algorithm etc..And Near-field beamforming algorithm was proposed in 2004, since Near field acoustic is more complicated,
In Near-field beamforming algorithm field, Near-field beamforming algorithm is mainly used for eliminating the noise in cubicle.
Why under the scene for accessing original microphone, fixed beam formation algorithm is preferentially used, is because of fixed wave
Beam formation algorithm has been decayed the noise signal in microphone well, and can largely improve voice quality.And it is original
Microphone, usually old-fashioned, often noise control is bad, and noise is relatively low.Fixed beam formation algorithm is mentioned by Flanagan
Out, which is mainly made of three parts: first is that time delay is estimated；Second is that delay compensation；Third is that cumulative.So, signal had been both
It may be implemented effectively to correct, and can achieve the purpose of alignment.However, it is desirable to explanation, the realization of the algorithm is relatively
Simply, and in terms of multi-microphone speech enhan-cement effect, reinforcing effect is more preferably significant.Therefore, fixed beam is in multi-microphone
In terms of noise reduction, there is good application effect.
The formation of Subspace algorithm is more early, and in practical field using relatively broad, cardinal principle is by making an uproar language to band
The correlation matrix of sound signal carries out singular value decomposition, and signal space is divided into signal subspace and noise subspace, removes denoising
Subspace rebuilds the voice signal of enhancing with signal subspace.There is also certain deficiency, its real-times for Subspace algorithm
Difference, and it is more sensitive for acoustic enviroment, do not adapt to the strong space of time variation and environment.
In the specific implementation, above-mentioned many algorithms can allow user voluntarily to select, can be according to their own situation
It is applied.
Finally it should be emphasised that, specific embodiment of the present invention be it is illustrative, without being restrictive, therefore
The present invention includes being not limited to embodiment described in specific embodiment, all according to the present invention by those skilled in the art
The other embodiments that technical solution obtains, also belong to the scope of protection of the invention.
Claims (3)
1. a kind of conference system of multi-microphone array noise reduction, which is characterized in that it is by microphone adaptation module, microphone number
Change module, microphone denoising module composition, carries out voice and Noise Acquisition, noise reduction process using existing or newly-increased microphone, and
Using a variety of noise-reduction methods and algorithm, in which:
Microphone adaptation module is simulation microphone for accessing and being adapted to existing or newly-increased microphone, existing or newly-increased microphone
Or digital microphone；
Microphone digital module is used for the digitized processing of analog microphone signal, and all processing signals of system are digital letter
Number, system is provided to analog microphone signal digitizing function, to be compatible with multiple types microphone；
Microphone denoising module is by dual microphone noise reduction selector, dual microphone de-noising processor, multi-microphone noise reduction selector
It is formed with multi-microphone de-noising processor, is respectively used to selection noise reduction microphone and noise reduction algorithm and processing；
System uses dual microphone noise reduction mode and algorithm, or uses multi-microphone array noise reduction mode and algorithm；
Multiple microphones of system are arranged according to linear array, rectangular array or circular array, these three are arranged under scene
Noise reduction mode and algorithm it is different.
2. a kind of noise-reduction method of the conference system of multi-microphone array noise reduction according to claim 1, which is characterized in that
Using dual microphone noise reduction mode and algorithm, or use multi-microphone array noise reduction mode and algorithm, in which:
Dual microphone noise reduction mode uses two different methods and algorithm, in which:
Method 1 specifically: when some microphone M1 is in speech mode, neighboring microphones M2 will be opened automatically, microphone
M1 and neighboring microphones M2 acquires the sound of spokesman and the noise of surrounding simultaneously, and obtain 4 kinds of sound waves altogether at this time: Sm1 is indicated
The sound of the spokesman of microphone M1 acquisition, Nm1 indicate that the noise around microphone M1 acquisition, Sm2 indicate that microphone M2 is adopted
The sound of the spokesman of collection, Nm2 indicate the noise around microphone M2 acquisition；Because since the noise of surrounding is relative to hair
The sound of speech people is all far from microphone M1 and microphone M2, therefore Nm1=Nm2 is obtained by noise reduction chip progress Difference Calculation
Nv=Nm1-Nm2=0 eliminates noise；Meanwhile spokesman is closer from microphone M1, farther out from microphone M2, therefore Sm1 >
Sm2 carries out Difference Calculation by noise reduction chip, obtains Sv=Sm1-Sm2, and Sv is the sound for eliminating the spokesman after noise,
But volume is smaller, is amplified；
Method 2 specifically: when some microphone M1 is in speech mode, neighboring microphones M2 will be opened automatically, microphone
M1 and neighboring microphones M2 acquires the sound of spokesman and the noise of surrounding, the speech of microphone M1 and microphone M2 acquisition simultaneously
The sound of people has an intensity difference of about 6dB, the alternative sounds that noise reduction chip is collected into using microphone M1 and microphone M2 into
Row processing, can automatically generate the sound wave opposite with noise, be used to active offset noise；
Multi-microphone array noise reduction mode and algorithm, using three kinds of different methods and algorithm, a certain Mike in multiple microphones
As main microphon when wind M1 is in speech mode, in addition more microphone M2, M3, M4 ... Mn are used as auxiliary microphone,
And select any x microphone as noise reduction auxiliary microphone from this n-1 auxiliary microphone, and the choosing of noise reduction microphone
Selection method is different, in which:
For the conference system of linear array arrangement, x microphone is randomly choosed, or microphone is selected using following rule: if
Microphone M1 is in the both ends of linear array, then needs to select microphone, midfeather int (n/x) Mike to a direction
Wind；If microphone M1 is not at the both ends of linear array, all microphones in linear array are regarded as closed loop, and two-way respectively
Microphone is selected, int (n/x) microphone is spaced, wherein int is bracket function；
For the conference system of rectangular array, x microphone is randomly choosed, or using microphone M1 as starting point, it is double respectively
To selection microphone, rule are as follows: interval int (n/x) microphone, wherein int is bracket function；
For the conference system of circular array arrangement, x microphone is randomly choosed, or using microphone M1 as starting point, it is double respectively
To selection microphone, rule are as follows: interval int (n/x) microphone, wherein int is bracket function.
3. a kind of conference system of multi-microphone array noise reduction according to claim 1, which is characterized in that in multi-microphone
Under noise reduction mode, noise elimination is carried out using different algorithms, moreover, different algorithms is that user is allowed to select, in which:
For cubicle scene, noise reduction process is carried out using Near-field beamforming algorithm；
There is the scene of original microphone for access, noise reduction process is carried out using fixed beam formation algorithm；
For other situations, noise reduction process is carried out using Subspace algorithm.
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| CN110113493B (en) * | 2019-05-06 | 2021-03-12 | Oppo广东移动通信有限公司 | Multi-microphone recording method and related product |
| CN110225430A (en) * | 2019-06-12 | 2019-09-10 | 付金龙 | A kind of noise reduction osteoacusis headset and its noise-reduction method |
| CN110797043B (en) * | 2019-11-13 | 2022-04-12 | 思必驰科技股份有限公司 | Conference voice real-time transcription method and system |
| CN111540365B (en) * | 2020-07-10 | 2020-10-23 | 北京声智科技有限公司 | Voice signal determination method, device, server and storage medium |
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| CN102111697B (en) * | 2009-12-28 | 2015-03-25 | 歌尔声学股份有限公司 | Method and device for controlling noise reduction of microphone array |
| FR2992459B1 (en) * | 2012-06-26 | 2014-08-15 | Parrot | METHOD FOR DEBRUCTING AN ACOUSTIC SIGNAL FOR A MULTI-MICROPHONE AUDIO DEVICE OPERATING IN A NOISE MEDIUM |
| CN107018470B (en) * | 2016-01-28 | 2019-02-26 | 讯飞智元信息科技有限公司 | A kind of voice recording method and system based on annular microphone array |
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Denomination of invention: A conference system with multi microphone array for noise reduction Effective date of registration: 20220615 Granted publication date: 20190426 Pledgee: China Construction Bank Corporation Nanjing Chengnan sub branch Pledgor: JIANGSU HUATENG INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2022980007907 |