CN105872898A - Noise reduction processing method and apparatus based on double microphones - Google Patents
Noise reduction processing method and apparatus based on double microphones Download PDFInfo
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- CN105872898A CN105872898A CN201610224851.3A CN201610224851A CN105872898A CN 105872898 A CN105872898 A CN 105872898A CN 201610224851 A CN201610224851 A CN 201610224851A CN 105872898 A CN105872898 A CN 105872898A
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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
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Abstract
The invention relates to the technical field of communication, and particularly relates to a noise reduction processing method and apparatus based on double microphones. The method disclosed by the invention comprises the steps of acquiring distances respectively from the two microphones with a fixed relative position relationship to an active sound source; and according to the two distances, based on a receiving signal of at least one microphone, regulating a noise reduction mode. According to the noise reduction processing method and apparatus based on double microphones, which are provided by the invention, not only can the noise reduction mode be regulated according to the distances from two microphones to the active sound source and picked audio signal amplitudes of the active sound source, but also main and auxiliary microphones can be determined according to the distances from two microphones to the active sound source, and according to a difference condition between the audio signal amplitudes of the active sound source, which are picked by two microphones, the audio signal amplitudes picked by the two microphones are regulated, so that the difference between the audio signal amplitudes picked by the two microphones is in a preset range value, thereby avoiding the problems of no transmission sound, small transmission volume and the like and achieving effects of eliminating noise in the surrounding environment and improving conversation quality.
Description
[technical field]
The present invention relates to communication technical field, particularly relate to a kind of noise reduction process method based on double microphones and
Device.
[background technology]
The hand-held verbal system of existing part have employed the mode that double MIC (microphone) abates the noise, its
Principle is: one of them main MIC, and close to the mouth of user, another auxiliary MIC is positioned at verbal system
The back side or end face, and as far as possible away from main MIC；Generally, main MIC and auxiliary MIC picks up
The signal amplitude of ambient noise is basically identical, after differential amplification processes, ambient noise
Signal can be suppressed, and for useful voice signal, and due to main MIC, to be normally at verbal system following
Edge (during its normal talking, near mouth) so that the useful voice signal amplitude that main MIC picks up is obvious
The voice signal amplitude picked up more than auxiliary MIC, can realize the amplification of signal after differential amplification and go back
Former, thus realize noise reduction.
From the foregoing, it will be observed that in the mode of existing pair of MIC elimination noise reduction, the position of its main MIC and auxiliary MIC
When putting fixing, and to realize abating the noise is that useful signal amplitude that main MIC picks up must in advance
The useful signal picked up more than auxiliary MIC；If the useful signal amplitude that main MIC picks up is less than or equal to auxiliary
During the useful signal amplitude that MIC picks up, it not only can make the disabler that abates the noise, thereby increases and it is possible to causes
Send words noiseless, send the problems such as speech amount is little.
And in actually used, user takes and holds the useful signal that the mode of verbal system can cause main MIC to pick up
The useful signal amplitude that amplitude is picked up less than or equal to auxiliary MIC, such as, main MIC deviates face, leads to
The situations such as main MIC, sleeping use verbal system call and shoulder folder verbal system call are surprisingly blocked during words；
Further, since main MIC and the auxiliary MIC own sensitivity difference of parts etc., also result in main MIC with auxiliary
The useful signal amplitude indifference that MIC picks up, and then the above-mentioned disabler that abates the noise occurs, gives words nothing
Sound, send the problems such as speech amount is little.
[summary of the invention]
The purpose of the present invention aims to solve the problem that at least one problem above-mentioned, it is provided that a kind of falls based on double microphones
Make an uproar processing method and processing device.
For realizing this purpose, the invention provides a kind of noise reduction process method based on double microphones, including with
Lower step:
Obtain two fixing described microphones of relative position relation each to the distance of active sound source；
According to said two distance, accepted call signal based on the microphone at least one described adjusts noise reduction side
Formula.
Further, described according to said two distance, based on the microphone at least one described called
Before signal adjusts the step of noise reduction mode, also include:
Each main and auxiliary microphone is determined to the distance of active sound source according to two described microphones.
Concrete, described each determine main and auxiliary words to the distance of active sound source according to two described microphones
In the step of cylinder, specifically include:
Two described microphones are each compared to the distance of active sound source and draws comparison result；
Judge apart near microphone as main microphone according to described comparing result, be auxiliary words apart from remote microphone
Cylinder.
Concrete, two described microphones that described acquisition relative position relation is fixed are each to active sound source
Distance step in, specifically include:
Detect two described microphones each relative to the deviation post of described active sound source；
Deviation post according to two described microphones determines that two described microphones are each to described active
The distance of sound source.
Concrete, two described microphones of described detection are each relative to the deviation post of described active sound source
Step in, specifically include:
Pressure information on detection smart machine in real time；
Main body and institute is sent by what the pressure information on described smart machine judged described active sound source
State the contact area of specific region on smart machine；
Two described microphones each inclined relative to described active sound source is judged according to described contact area
Pan position.
Optionally, described according to said two distance, accepted call signal based on the microphone at least one described
Adjust in the step of noise reduction mode, specifically include:
Switch to the single wheat noise reduction mode being single wheat with the microphone near apart from described active sound source.
Concrete, switch to, described, the single wheat noise reduction being single wheat with the microphone near apart from described active sound source
In the step of mode, specifically include:
The microphone disabling that described in command range, actively sound source is remote.
Concrete, described according to said two distance, accepted call signal based on the microphone at least one described
Adjust in the step of noise reduction mode, specifically include:
Adjust the audio frequency signal amplitude value that two described microphones are picked up, so that two described microphones are picked up
Audio frequency signal amplitude value between difference be in preset range value.
Concrete, during the audio frequency signal amplitude value that two described microphones of described adjustment are picked up, tool
Body includes:
Adjust described main microphone and/or audio frequency signal amplitude value that auxiliary microphone is picked up, so that described main microphone picks up
To the audio frequency signal amplitude value picked up more than auxiliary microphone of audio frequency signal amplitude value.
Further, described according to said two distance, called letter based on the microphone at least one described
Number adjust noise reduction mode step in, also include:
Obtain the audio frequency signal amplitude value that two described microphones are picked up；
The audio frequency signal amplitude value picked up by the microphone that two described is compared judgement, to draw two institutes
Difference situation between the audio frequency signal amplitude value that the microphone stated is picked up；
According to the difference situation between the audio frequency signal amplitude value that two described microphones are picked up, determine two
The adjustment mode of the audio frequency signal amplitude value that described microphone is picked up.
Concrete, between the described audio frequency signal amplitude value picked up according to two described microphones difference feelings
Condition, determines in the step of adjustment mode of the audio frequency signal amplitude value that two described microphones pick up, specifically
Including:
According to the difference situation between the audio frequency signal amplitude value that two described microphones are picked up, determine master
The audio frequency signal amplitude value that microphone is picked up tunes up certain value and/or the audio frequency signal amplitude picked up by auxiliary microphone
Value turns certain value down.
Further, in the audio frequency signal amplitude value that two described microphones of described adjustment are picked up, so that two
Difference between the audio frequency signal amplitude value that individual described microphone is picked up be in the step in preset range value it
After, also include:
The audio frequency signal amplitude value picked up by the microphone that two described carries out differential amplification process.
Concrete, the executive agent of the method includes mobile phone, earphone, audiphone, intelligent watch, intelligence
Drive recorder, notebook computer or panel computer.
It is also preferred that the left the executive agent of the method is smart mobile phone.
Accordingly, present invention also offers a kind of noise reduction process device based on double microphones, including:
Acquisition module, for obtaining two fixing described microphones of relative position relation each to Active Acoustic
The distance in source；
Adjusting module, is used for according to said two distance, called letter based on the microphone at least one described
Number adjust noise reduction mode.
Further, device of the present invention, also include:
Determination module, for each determining main and auxiliary to the distance of active sound source according to two described microphones
Microphone.
Concrete, described determination module includes:
Comparing unit, for each comparing two described microphones to the distance of active sound source and obtaining
Go out comparison result；
Identifying unit, for judging apart near microphone as main microphone according to described comparing result, distance is far
Microphone be auxiliary microphone.
Concrete, described acquisition module includes:
Detector unit, for two described microphones of detection each relative to the bits of offset of described active sound source
Put；
Range estimation unit, for determining described in two according to the deviation post of two described microphones
Cylinder is each to the distance of described active sound source.
Concrete, described detector unit includes:
Pressure detecting subelement, the pressure information on detection smart machine in real time；
Judgment sub-unit, for judging described active sound source by the pressure information on described smart machine
Send the contact area of specific region on main body and described smart machine；
According to described contact area, location determination subelement, for judging that two described microphones are the most relative
Deviation post in described active sound source.
Optionally, described adjusting module includes:
Switch unit, for switching to the single wheat noise reduction being single wheat with the microphone near apart from described active sound source
Mode.
Concrete, described switch unit includes:
Control subelement, for the microphone disabling that described in command range, actively sound source is remote.
Concrete, described adjusting module includes:
Amplitude adjustment unit, for adjusting the audio frequency signal amplitude value that two described microphones are picked up, so that
Difference between the audio frequency signal amplitude value that two described microphones are picked up is in preset range value.
Concrete, described amplitude adjustment unit includes:
Signal adjusts subelement, for the audio frequency signal amplitude adjusting described main microphone and/or auxiliary microphone is picked up
Value, so that the audio frequency signal amplitude that the audio frequency signal amplitude value that described main microphone is picked up is picked up more than auxiliary microphone
Value.
Further, described adjusting module also includes:
Signal acquiring unit, for obtaining the audio frequency signal amplitude value that two described microphones are picked up；
Contrast judgement unit, compares for the audio frequency signal amplitude value picked up by the microphone that two described
Judge, to draw the difference situation between the audio frequency signal amplitude value that two described microphones are picked up；
Mode identifying unit, between the audio frequency signal amplitude value picked up according to two described microphones
Difference situation, determines the adjustment mode of the audio frequency signal amplitude value that two described microphones pick up.
Concrete, described mode identifying unit includes:
Determine subelement, the difference between the audio frequency signal amplitude value picked up according to two described microphones
Value situation, determines that the audio frequency signal amplitude value picked up by main microphone tunes up certain value and/or picked up by auxiliary microphone
Audio frequency signal amplitude value turn certain value down.
Further, described adjusting module also includes:
Processing unit, carries out differential amplification for the audio frequency signal amplitude value picked up by the microphone that two described
Process.
Concrete, the mounting body of this device includes mobile phone, earphone, audiphone, intelligent watch, intelligence
Drive recorder, notebook computer or panel computer.
It is also preferred that the left the mounting body of this device is smart mobile phone.
Compared with prior art, the present invention possesses following advantage:
The present invention can obtain two fixing described microphones of relative position relation each to active sound source away from
From, and according to said two distance, accepted call signal based on the microphone at least one described adjusts noise reduction side
Formula；Wherein, when two microphones pick up the audio frequency signal amplitude of actively sound source closely time, can be adjusted to
In the single wheat noise reduction mode being single wheat based on the microphone close to active sound source, when Active Acoustic picked up by two microphones
When the audio frequency signal amplitude in source is variant, then it is adjusted to double microphone noise reduction mode, can avoid because of two with this
Microphone pick up the audio frequency signal amplitude of actively sound source close to and occur sending that words are noiseless, send the problems such as speech amount is little.
Secondly, two described microphones each can be compared to the distance of active sound source and obtain by the present invention
Go out comparison result, then judge apart near microphone as main microphone according to described comparing result, apart from remote
Microphone is auxiliary microphone, and it can avoid user in actual use because of by holding the mode of verbal system (such as,
Verbal system lower limb microphone deviation face, call time surprisingly block verbal system lower limb microphone,
Sleeping use the mode such as verbal system call and shoulder folder verbal system call) different and make under verbal system
The useful signal amplitude that the microphone at edge is picked up is less than or equal to having of the microphone of the verbal system back side or end face
By signal amplitude, and then avoid the occurrence of and send that words are noiseless, send the problems such as speech amount is little.Meanwhile, phase is being obtained
During to fixing two the described microphones of position relationship each to the distance of active sound source, it is by detection two
Individual described microphone is each relative to the deviation post of described active sound source, then according to described in two
The deviation post of cylinder determines the distance of two described microphones each extremely described active sound source, and this process can be relatively
Two described microphones of acquisition are each to the distance of active sound source accurately, and then are easy to according to said two
Main microphone and auxiliary microphone is determined apart from accurate.
It addition, in using double microphone noise reduction mode, the sound that the microphone that two are described can be picked up by the present invention
Frequently signal amplitude value is compared judgement, to draw the audio frequency signal amplitude value that two described microphones are picked up
Between difference situation, the difference between the audio frequency signal amplitude value then picked up according to two described microphones
Value situation, determines that the audio frequency signal amplitude value picked up by main microphone tunes up certain value and/or picked up by auxiliary microphone
Audio frequency signal amplitude value turn certain value down, so that the audio frequency signal amplitude value that two described microphones are picked up
Between difference be in preset range value, and then the audio frequency signal amplitude that the microphone that two are described is picked up
Value carries out differential amplification process；This process not only can preferably realize eliminating the noise of surrounding environment, and can
Effectively the voice signal of active sound source is sent out, the raising speech quality of higher degree.
To sum up, the present invention not only can be according to the distance of two microphones to active sound source and pick up actively sound source
Audio frequency signal amplitude adjusts noise reduction mode, and can determine according to the distance of two microphones to active sound source
Main and auxiliary microphone, and the difference between the audio frequency signal amplitude value of actively sound source is picked up according to two microphones
Situation adjusts the audio frequency signal amplitude value that two described microphones are picked up, so that two described microphones pick up
To audio frequency signal amplitude value between difference be in preset range value, and then avoid the occurrence of send words noiseless,
Send the problems such as speech amount is little and realize eliminating the noise of surrounding environment, improve the effect of speech quality.
[accompanying drawing explanation]
Fig. 1 is the program circuit of an embodiment of noise reduction process methods based on double microphones in the present invention
Figure；
Fig. 2 is to calculate main and auxiliary microphone in the present invention to the use state simulation figure during distance of actively sound source；
Cheek and the structural representation of smart machine contact area when Fig. 3 is to use each occupation mode；
Fig. 4 is the structured flowchart of an embodiment of noise reduction process devices based on double microphones in the present invention.
[detailed description of the invention]
With exemplary embodiment, the present invention is further described below in conjunction with the accompanying drawings, described embodiment
Example is shown in the drawings, and the most same or similar label represents same or similar element
Or there is the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary,
It is only used for explaining the present invention, and is not construed as limiting the claims.Additionally, if it is known that technology
Describe in detail and the invention is characterized in that unnecessary for illustrating, then omitted.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative used herein
" one ", " one ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that
The wording used in the specification of the present invention " includes " referring to there is described feature, integer, step, behaviour
Make, element and/or assembly, but it is not excluded that existence or add other features one or more, integer,
Step, operation, element, assembly and/or their group.It should be understood that when we claim element to be " connected "
Or during " coupled " to another element, it can be directly connected or coupled to other elements, or can also
There is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connection or
Wireless couple.Wording "and/or" used herein includes that what one or more was associated lists the complete of item
Portion or any cell combine with whole.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (bag
Include technical term and scientific terminology), there is the general reason with the those of ordinary skill in art of the present invention
Solve identical meaning.Should also be understood that those terms defined in such as general dictionary, it should quilt
It is interpreted as that there is the meaning consistent with the meaning in the context of prior art, and unless as here
By specific definitions, otherwise will not explain by idealization or the most formal implication.
Those skilled in the art of the present technique be both appreciated that " terminal " used herein above, " terminal device "
Including the equipment of wireless signal receiver, it only possesses the equipment of wireless signal receiver of non-emissive ability,
Including again the equipment receiving and launching hardware, it has and can perform two-way on bidirectional communication link
The reception of letter and the equipment of transmitting hardware.This equipment may include that honeycomb or other communication equipments, its
There is single line display or multi-line display or do not have the honeycomb of multi-line display or other communication to set
Standby；PCS (Personal Communications Service, PCS Personal Communications System), it can combine language
Sound, data process, fax and/or its communication ability；PDA (Personal Digital Assistant,
Personal digital assistant), it can include the access of radio frequency receiver, pager, the Internet/intranet, net
Network browser, notepad, calendar and/or GPS (Global Positioning System, global positioning system
System) receiver；Conventional laptop and/or palmtop computer or other equipment, it has and/or includes
The conventional laptop of radio frequency receiver and/or palmtop computer or other equipment.Used herein above " whole
End ", " terminal device " can be portable, can transport, be arranged on the vehicles (aviation, sea-freight and/
Or land) in, or be suitable for and/or be configured at local runtime, and/or with distribution form, fortune
Row runs in any other position in the earth and/or space." terminal " used herein above, " terminal device "
Can also is that communication terminal, access terminals, music/video playback terminal, such as, can be PDA, MID
(Mobile Internet Device, mobile internet device) and/or there is music/video playing function
Mobile phone, it is also possible to be the equipment such as intelligent television, Set Top Box.
Those skilled in the art of the present technique are appreciated that server used herein above, high in the clouds, far-end network
The concepts such as equipment, have effects equivalent, and it includes but not limited to computer, network host, single network
The cloud that server, multiple webserver collection or multiple server are constituted.Here, cloud is by based on cloud computing
A large amount of computers of (Cloud Computing) or the webserver are constituted, and wherein, cloud computing is distribution
The one that formula calculates, the super virtual machine being made up of a group loosely-coupled computer collection.This
In inventive embodiment, can be by any between remote network devices, terminal device and WNS server
Communication mode realizes communication, includes but not limited to, mobile communication based on 3GPP, LTE, WIMAX,
Based on TCP/IP, the computer network communication of udp protocol and based on bluetooth, Infrared Transmission standard near
Away from wireless transmission method.
It is necessary that first application scenarios and principle to the present invention carries out following guiding explanation.
" microphone " of the present invention also can claim " MIC (microphone) ", and it is a kind of microphone, i.e.
Voice signal is converted to the energy conversion device of the signal of telecommunication；Wherein, " single wheat " refers to that verbal system is only
One microphone or only enable microphone and receive audio signal, " diamylose " refers to enable when verbal system is conversed
Two microphones receive audio signal；" actively sound source " of the present invention refers to that plan will by verbal system
The sound that voice signal sends out produces and sends position, and such as people wants oneself to be said by verbal system
The language gone out sends out, then what under this scene, actively sound source referred to is exactly the mouth of people.
The method of the present invention and the application scenarios of device, be based on at least two microphone, process
Device, the verbal system of sensor (such as range sensor or pressure sensor etc.), described verbal system can
For mobile phone, earphone, audiphone, intelligent watch, intelligent travelling crane recorder, notebook computer or flat board electricity
Brains etc., below will be illustrative as a example by mobile phone, but should be noted that this description is example
Property, the scope of the present invention is not limited thereto, and the big method and apparatus of the embodiment of the present invention is also applied for it
His verbal system.
Referring to accompanying drawing 1, a typical case of a kind of noise reduction process methods based on double microphones of the present invention implements
Example, it comprises the following steps:
S100, obtain two fixing described microphones of relative position relation each to active sound source away from
From.
Concrete, the detailed process of this step includes: (1) detect two described microphones each relative to
The deviation post of described active sound source.
Wherein, the pressure information on smart machine can be detected in real time by the associated components on verbal system,
Then main body is sent with described by what the pressure information on described smart machine judged described active sound source
The contact area of specific region on smart machine, judges two described microphones further according to described contact area
Each relative to the deviation post of described active sound source.
Such as, when people implements call by the double microphone mobile phone of touch-screen, by obtaining and people face can be judged
It is each (main relative to described mouth that cheek and the change of touch-screen contact area determine said two microphone
Dynamic sound source) deviation post.
(2) determine that two described microphones are each to described according to the deviation post of two described microphones
The actively distance of sound source.
Wherein, because the position that two microphones are on verbal system is to have fixed, because of
This, only it is to be understood that after this two microphones deviation post relative to described active sound source, then pass through processor
Internal relevant treatment calculates and can show that two described microphones are each to the distance of described active sound source.
S110, each determines main and auxiliary microphone to the distance of active sound source according to two described microphones.
Concrete, two described microphones are each compared to the distance of active sound source and draws comparison
As a result, then judge apart near microphone as main microphone according to described comparing result, apart from remote microphone be
Auxiliary microphone.
Shown in complex chart 2 and accompanying drawing 3, as a example by people implements call by the double microphone mobile phone of touch-screen, figure
S in 2 represents the contact area of touch-screen and cheek, and L1 represents the main microphone distance to face, L2
Represent the auxiliary microphone distance to face；Wherein cheek and the contact area of touch-screen, can make according to right-hand man
With and mobile phone deviation normal place difference distinguish, as it is shown on figure 3, when use left hand use time,
Cheek is mainly S1 regional location in upper right side in Fig. 3 with the contact position of touch-screen, can be according to S1 region
The mutation analysis of position judges its offset Y axial position during mobile phone communication, calculate L1,
The respective distance value of L2；When using the right hand to use, cheek is mainly Fig. 3 with the contact position of touch-screen
Middle upper left side S2 regional location, when can judge mobile phone communication according to the mutation analysis of S2 regional location its
The axial position of offset Y, calculates the corresponding distance value of L1, L2；Along X in mobile phone uses
When axle turns up, the lower edge in the S3 region in Fig. 3 will be shifted up, and then the area in S3 region i.e. can diminish,
Then the corresponding distance value of L1, L2 can be calculated according to the change in S3 region.
S120, according to said two distance, accepted call signal based on the microphone at least one described adjusts fall
Make an uproar mode.
Wherein, when two microphones pick up the audio frequency signal amplitude of actively sound source closely time (if directly will
The audio signal of the active sound source that two microphones are picked up carries out differential amplification process, then can make actively sound source
Audio signal suppression offset, and then occur sending the problems such as speech amount is little, noiseless), can be adjusted to based on from
The microphone that actively sound source is near is single wheat noise reduction mode of single wheat, when the audio frequency of actively sound source picked up by two microphones
When signal amplitude is variant, then it is adjusted to double microphone noise reduction mode.The detailed process of this step is: first obtain
Take the audio frequency signal amplitude value that two described microphones are picked up, the sound then picked up by the microphone that two described
Frequently signal amplitude value is compared judgement, to draw the audio frequency signal amplitude value that two described microphones are picked up
Between difference situation, further according to the difference between the audio frequency signal amplitude value that two described microphones are picked up
Situation, determines the adjustment mode of the audio frequency signal amplitude value that two described microphones pick up.
Such as, when people is during with mobile phone communication, by obtaining the audio signal that main and auxiliary microphone is picked up
Range value after carrying out contrast judgement, show that main microphone picks up, with auxiliary microphone, the audio signal that people's mouth sends
When amplitude is closer to, can switch to single microphone call, the most only with main microphone, (distance people's mouth is nearer
Microphone) implement noise reduction and call, and control auxiliary microphone (distance people's mouth microphone farther out) disabling；If
Show that main microphone and auxiliary microphone pick up the audio frequency signal amplitude that people's mouth sends when having different, then adjust
Switch to double microphone noise reduction talking mode.
When taking double microphone noise reduction mode, its concrete noise-reduction method step is as follows:
(1) the audio frequency signal amplitude value that two described microphones are picked up is adjusted, so that described in two
Difference between the audio frequency signal amplitude value that cylinder is picked up is in preset range.It is mainly according to double microphones
Audio frequency signal amplitude value and the respective distance to active sound source of the active sound source each picked up are implemented to adjust
's；Preferably, between the audio frequency signal amplitude value of the active sound source that the microphone described in said two is picked up
Difference is not less than 6db.
When adjusting the audio frequency signal amplitude value that two described microphones are picked up, main microphone described in concrete adjustable and
/ or the audio frequency signal amplitude value picked up of auxiliary microphone, so that the audio frequency signal amplitude value that described main microphone is picked up is big
In the audio frequency signal amplitude value that auxiliary microphone is picked up.
Such as, the audio frequency signal amplitude value that the audio frequency signal amplitude value picked up when main microphone is picked up with auxiliary microphone
Between difference less than 6db time, can by adjusting the gain of audio frequency signal amplitude value that main microphone be picked up,
So that the difference between the audio frequency signal amplitude value picked up of main and auxiliary microphone is not less than 6db, the most also can be by
The audio frequency signal amplitude value of auxiliary microphone is turned down, or is adjusting the audio frequency signal amplitude value increasing that main microphone is picked up
While benefit, the audio frequency signal amplitude value of auxiliary microphone is turned down.
(2) the audio frequency signal amplitude value that the microphone that two described is picked up is carried out differential amplification process.
Concrete, when carrying out differential amplification and processing, the audio frequency being closer to main and auxiliary microphone can picked up
Signal amplitude value offsets suppression (i.e. ambient noise), and the audio frequency signal amplitude value picked up by main microphone
Audio frequency signal amplitude value (the i.e. actively audio frequency letter of sound source more than the audio frequency signal amplitude value that auxiliary microphone is picked up
Number) be amplified processing, to improve effective audio frequency signal amplitude value, and then improve speech quality effect.
Such as, when people is during with mobile phone communication, first according on mobile phone two microphones to people's mouth away from
From the main and auxiliary microphone determining mobile phone, (by the close together main microphone that is defined as, distant is defined as
Auxiliary microphone), and obtain the audio frequency signal amplitude value that this main and auxiliary microphone is picked up, main and auxiliary microphone is picked up
Audio frequency signal amplitude value is compared judgement, draws between the audio frequency signal amplitude value that these two microphones are picked up
Difference situation, the difference between the audio frequency signal amplitude value that main and auxiliary microphone is picked up less than 6db time,
Adjust the gain of the audio frequency signal amplitude value that main microphone is picked up, so that the audio signal that main and auxiliary microphone is picked up
Difference between range value is not less than 6db, the audio signal that the main and auxiliary microphone after then adjusting is picked up
Range value carries out common mode inhibition, differential amplification processes, and to eliminate the noise signal of surrounding environment, retains one
The useful signal range value (the audio frequency signal amplitude value that people's mouth that i.e. main microphone is picked up sends) of fixed number value,
And then realize eliminating ambient noise, improve speech quality effect.
To sum up, the present invention not only can be according to the distance of two microphones to active sound source and pick up actively sound source
Audio frequency signal amplitude adjusts noise reduction mode, and can determine according to the distance of two microphones to active sound source
Main and auxiliary microphone, and the difference between the audio frequency signal amplitude value of actively sound source is picked up according to two microphones
Situation adjusts the audio frequency signal amplitude value that two described microphones are picked up, so that two described microphones pick up
To audio frequency signal amplitude value between difference be in preset range value, and then avoid the occurrence of send words noiseless,
Send the problems such as speech amount is little and realize eliminating the noise of surrounding environment, improve the effect of speech quality.
Accordingly, according to the function modoularization thinking of computer software, present invention also offers a kind of based on
The noise reduction process device of double microphones, namely the processor of a kind of noise reduction process method based on double microphones, please
See accompanying drawing 4, disclose module and the concrete function of each module realization that this device includes in detail below.Should
Device includes:
Acquisition module 11, for obtaining two fixing described microphones of relative position relation each to actively
The distance of sound source.
Concrete, this acquisition module 11 specifically includes: detector unit, for two described microphones of detection
Each relative to the deviation post of described active sound source；Range estimation unit, for described according to two
The deviation post of microphone determines that two described microphones are each to the distance of described active sound source.
Wherein, because the position that two microphones are on verbal system is the most i.e. fixed, therefore,
Only it is to be understood that after this two microphones deviation post relative to described active sound source, then by range estimation list
Unit show that two described microphones are each to the distance of described active sound source.
During detector unit work, the pressure on smart machine can be detected in real time by pressure detecting subelement and believe
Breath, then judges described Active Acoustic by judgment sub-unit according to the pressure information on described smart machine
Source send the contact area of specific region on main body and described smart machine, then by location determination list
According to described contact area, unit judges that two described microphones are each relative to the bits of offset of described active sound source
Put.
Such as, when people implements call by the double microphone mobile phone of touch-screen, can be obtained also by detector unit
Judge that people's cheek and the change of touch-screen contact area are to determine said two microphone each relative to described
The deviation post of mouth (actively sound source).
Determination module 12, for according to two described microphones each to the distance of active sound source determine main,
Auxiliary microphone.
Concrete, when described determination module 12 works, first pass through comparing unit by each for two described microphones
Compare from the distance to active sound source and draw comparison result, then by identifying unit according to described
Comparing result judges apart near microphone as main microphone, is auxiliary microphone apart from remote microphone.
Shown in complex chart 2 and accompanying drawing 3, as a example by people implements call by the double microphone mobile phone of touch-screen, figure
S in 2 represents the contact area of touch-screen and cheek, and L1 represents the main microphone distance to face, L2
Represent the auxiliary microphone distance to face；Wherein cheek and the contact area of touch-screen, can make according to right-hand man
With and mobile phone deviation normal place difference distinguish, as it is shown on figure 3, when use left hand use time,
Cheek is mainly S1 regional location in upper right side in Fig. 3 with the contact position of touch-screen, can be according to S1 region
The mutation analysis of position judges its offset Y axial position during mobile phone communication, calculate L1,
The respective distance value of L2；When using the right hand to use, cheek is mainly Fig. 3 with the contact position of touch-screen
Middle upper left side S2 regional location, when can judge mobile phone communication according to the mutation analysis of S2 regional location its
The axial position of offset Y, calculates the corresponding distance value of L1, L2；Along X in mobile phone uses
When axle turns up, the lower edge in the S3 region in Fig. 3 will be shifted up, and then the area in S3 region i.e. can diminish,
Then the corresponding distance value of L1, L2 can be calculated according to the change in S3 region.
Adjusting module 13, for according to said two distance, based on the microphone at least one described called
Signal adjusts noise reduction mode.
Wherein, when two microphones pick up the audio frequency signal amplitude of actively sound source closely time (if directly will
The audio signal of the active sound source that two microphones are picked up carries out differential amplification process, then can make actively sound source
Audio signal suppression is offset, and then occurs sending the problems such as speech amount is little, noiseless), adjusting module can be passed through
Switch unit in 13 is adjusted to based on single wheat noise reduction mode that the microphone close to active sound source is single wheat,
When the audio frequency signal amplitude that actively sound source picked up by two microphones is variant, then it is adjusted to double microphone noise reduction side
Formula.The detailed process of this adjusting module 13 work is: first pass through signal acquiring unit acquisition two described
The audio frequency signal amplitude value that microphone is picked up, is then picked up the microphone that two described by contrast judgement unit
Audio frequency signal amplitude value compare judgement, to draw the audio signal width that two described microphones are picked up
Difference situation between angle value, then the audio frequency that pass-through mode identifying unit is picked up according to two described microphones
Difference situation between signal amplitude value, determines the audio frequency signal amplitude value that two described microphones pick up
Adjustment mode.
Such as, when people is during with mobile phone communication, obtain main and auxiliary microphone by signal acquiring unit and pick up
To audio frequency signal amplitude value and after carrying out contrast judgement, show that main microphone and auxiliary microphone are picked up people's mouth and sent out
When the audio frequency signal amplitude gone out is closer to, single microphone can be switched to converse by switch unit, the most only use
Main microphone (microphone that distance people's mouth is nearer) implements noise reduction and call, and controls son by switch unit
Unit controls auxiliary microphone (distance people's mouth microphone farther out) disabling；If drawing, main microphone picks up with auxiliary microphone
When the audio frequency signal amplitude sent to people's mouth has different, then adjust and switch to double microphone noise reduction call
Mode.
When taking double microphone noise reduction mode, the concrete noise reduction process of described adjusting module 13 is as follows:
(1) adjust, by amplitude adjustment unit, the audio frequency signal amplitude value that two described microphones are picked up, with
The difference between the audio frequency signal amplitude value that two described microphones pick up is made to be in preset range.It is main
If the audio frequency signal amplitude value of the active sound source each picked up according to double microphones and each to active sound source
Distance implements adjustment；Preferably, the audio frequency letter of the active sound source that the microphone described in said two is picked up
Difference between number range value is not less than 6db.
When adjusting the audio frequency signal amplitude value that two described microphones are picked up, specifically can pass through amplitude adjustment unit
In signal adjust subelement and adjust the audio frequency signal amplitude value that described main microphone and/or auxiliary microphone are picked up, with
The audio frequency signal amplitude value that the audio frequency signal amplitude value making described main microphone pick up is picked up more than auxiliary microphone.
Such as, the audio frequency signal amplitude value that the audio frequency signal amplitude value picked up when main microphone is picked up with auxiliary microphone
Between difference less than 6db time, can by adjusting the gain of audio frequency signal amplitude value that main microphone be picked up,
So that the difference between the audio frequency signal amplitude value picked up of main and auxiliary microphone is not less than 6db, the most also can be by
The audio frequency signal amplitude value of auxiliary microphone is turned down, or is adjusting the audio frequency signal amplitude value increasing that main microphone is picked up
The audio frequency signal amplitude value of auxiliary microphone being turned down while benefit, its which kind of adjustment mode specifically chosen performs can
In pass-through mode identifying unit, stator unit finally determines really
(2) the audio frequency signal amplitude value picked up by the microphone that two described by processing unit is carried out difference and puts
Big process.
Concrete, when carrying out differential amplification and processing, the audio frequency being closer to main and auxiliary microphone can picked up
Signal amplitude value offsets suppression (i.e. ambient noise), and the audio frequency signal amplitude value picked up by main microphone
Audio frequency signal amplitude value (the i.e. actively audio frequency letter of sound source more than the audio frequency signal amplitude value that auxiliary microphone is picked up
Number) be amplified processing, to improve effective audio frequency signal amplitude value, and then improve speech quality effect.
Such as, when people is during with mobile phone communication, first pass through determination module 12 according on mobile phone two
Microphone to the distance of people's mouth determine mobile phone main and auxiliary microphone (close together is defined as main microphone,
Distant is defined as auxiliary microphone), and obtain, by signal acquiring unit, the sound that this main and auxiliary microphone is picked up
Frequently signal amplitude value, then passes through the audio frequency signal amplitude value that main and auxiliary microphone is picked up by contrast judgement unit
Compare judgement, draw the difference situation between the audio frequency signal amplitude value that these two microphones are picked up, when
When difference between the audio frequency signal amplitude value that main and auxiliary microphone is picked up is less than 6db, by adjusting main microphone
The gain of the audio frequency signal amplitude value picked up, so that between the audio frequency signal amplitude value picked up of main and auxiliary microphone
Difference not less than 6db, the audio frequency letter that the main and auxiliary microphone after then being adjusted by processing unit is picked up
Number range value carries out common mode inhibition, differential amplification processes, and to eliminate the noise signal of surrounding environment, retains
Useful signal range value (the audio frequency signal amplitude that people's mouth that i.e. main microphone is picked up sends of certain numerical value
Value), and then realize eliminating ambient noise, improve speech quality effect.
To sum up, the present invention not only can be according to the distance of two microphones to active sound source and pick up actively sound source
Audio frequency signal amplitude adjusts noise reduction mode, and can determine according to the distance of two microphones to active sound source
Main and auxiliary microphone, and the difference between the audio frequency signal amplitude value of actively sound source is picked up according to two microphones
Situation adjusts the audio frequency signal amplitude value that two described microphones are picked up, so that two described microphones pick up
To audio frequency signal amplitude value between difference be in preset range value, and then avoid the occurrence of send words noiseless,
Send the problems such as speech amount is little and realize eliminating the noise of surrounding environment, improve the effect of speech quality.
In specification mentioned herein, although illustrate substantial amounts of detail.But, it is possible to reason
Solving, embodiments of the invention can be put into practice in the case of not having these details.In some embodiments
In, it is not shown specifically known method, structure and technology, in order to do not obscure the understanding of this description.
Although have been illustrated with some exemplary embodiments of the present invention above, but those skilled in the art
Member, can be to these exemplary enforcement it will be appreciated that in the case of without departing from the principle of the present invention or spirit
Example makes a change, and the scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a noise reduction process method based on double microphones, it is characterised in that comprise the following steps:
Obtain two fixing described microphones of relative position relation each to the distance of active sound source；
According to said two distance, accepted call signal based on the microphone at least one described adjusts noise reduction side
Formula.
2. the method for claim 1, it is characterised in that described according to said two distance,
Before accepted call signal based on the microphone at least one described adjusts the step of noise reduction mode, also include:
Each main and auxiliary microphone is determined to the distance of active sound source according to two described microphones.
3. method as claimed in claim 2, it is characterised in that described according to two described microphones
During each the distance to active sound source determines the step of main and auxiliary microphone, specifically include:
Two described microphones are each compared to the distance of active sound source and draws comparison result；
Judge apart near microphone as main microphone according to described comparing result, be auxiliary words apart from remote microphone
Cylinder.
4. the method as described in any one of claims 1 to 3, it is characterised in that described acquisition phase contraposition
Fixing two the described microphones of relation of putting each in the step of the distance of active sound source, specifically include:
Detect two described microphones each relative to the deviation post of described active sound source；
Deviation post according to two described microphones determines that two described microphones are each to described active
The distance of sound source.
5. method as claimed in claim 4, it is characterised in that two described microphones of described detection
Each in the step relative to the deviation post of described active sound source, specifically include:
Pressure information on detection smart machine in real time；
Main body and institute is sent by what the pressure information on described smart machine judged described active sound source
State the contact area of specific region on smart machine；
Two described microphones each inclined relative to described active sound source is judged according to described contact area
Pan position.
6. the method as described in any one of claims 1 to 3, it is characterised in that described according to described two
Individual distance, accepted call signal based on the microphone at least one described adjusts in the step of noise reduction mode, specifically
Including:
Switch to the single wheat noise reduction mode being single wheat with the microphone near apart from described active sound source.
7. method as claimed in claim 6, it is characterised in that switch to apart from described described
The microphone that actively sound source is near is in the step of single wheat noise reduction mode of single wheat, specifically includes:
The microphone disabling that described in command range, actively sound source is remote.
8. the method as described in any one of claims 1 to 3, it is characterised in that described according to described two
Individual distance, accepted call signal based on the microphone at least one described adjusts in the step of noise reduction mode, specifically
Including:
Adjust the audio frequency signal amplitude value that two described microphones are picked up, so that two described microphones are picked up
Audio frequency signal amplitude value between difference be in preset range value.
9. method as claimed in claim 8, it is characterised in that two described microphones of described adjustment
During the audio frequency signal amplitude value picked up, specifically include:
Adjust described main microphone and/or audio frequency signal amplitude value that auxiliary microphone is picked up, so that described main microphone picks up
To the audio frequency signal amplitude value picked up more than auxiliary microphone of audio frequency signal amplitude value.
10. a noise reduction process device based on double microphones, it is characterised in that including:
Acquisition module, for obtaining two fixing described microphones of relative position relation each to Active Acoustic
The distance in source；
Adjusting module, is used for according to said two distance, called letter based on the microphone at least one described
Number adjust noise reduction mode.
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