CN109348322A - A kind of radix saposhnikoviae method for de-noising, feed-forward noise reduction system, earphone and storage medium - Google Patents
A kind of radix saposhnikoviae method for de-noising, feed-forward noise reduction system, earphone and storage medium Download PDFInfo
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- CN109348322A CN109348322A CN201811043283.2A CN201811043283A CN109348322A CN 109348322 A CN109348322 A CN 109348322A CN 201811043283 A CN201811043283 A CN 201811043283A CN 109348322 A CN109348322 A CN 109348322A
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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 embodiment of the present application provides a kind of windproof method for de-noising, feed-forward noise reduction system, earphone and storage medium, wherein, method includes: to obtain the collected ambient noise signal of at least two feedforward microphones, and the windward side of at least two feedforward microphone is located at Different Plane；According to the energy of the collected ambient noise signal of at least two feedforward microphones, therefrom select the corresponding feedforward microphone of ambient noise signal for meeting energy requirement as target microphone；Feed forward noise reduction is carried out by effective noise floor of the collected ambient noise signal of target microphone.In the present embodiment, influence of the wind noise to feed forward noise reduction process can effectively reduce, optimize feed forward noise reduction effect.
Description
Technical field
This application involves noise reduction technology field more particularly to a kind of windproof method for de-noising, feed-forward noise reduction system, earphone and storages
Medium.
Background technique
The basic principle of feed forward noise reduction is to acquire ambient noise signal by the feedforward microphone outside earphone is arranged in, and lead to
It crosses noise filter and reverse phase processing is carried out to ambient noise, broadcasted by the loudspeaker inside earphone equivalent anti-with ambient noise signal
The de-noising signal of phase, to be offset to ambient noise signal.
Since feedforward microphone is directly exposed in external environment, it is highly susceptible to the interference of external environment,
Especially wind noise.This causes feed forward noise reduction process to be affected by wind noise, causes noise reduction effect bad.
Summary of the invention
The many aspects of the application provide a kind of windproof method for de-noising, feed-forward noise reduction system, earphone and storage medium, to reduce
Influence of the wind noise to feed forward noise reduction process.
The embodiment of the present application provides a kind of windproof method for de-noising, comprising:
The collected ambient noise signal of at least two feedforward microphones is obtained, at least two feedforward microphone is met
Wind face is located at Different Plane；
According to the energy of the collected ambient noise signal of at least two feedforward microphones, therefrom selection meets energy
It is required that the corresponding feedforward microphone of ambient noise signal as target microphone；
Feed forward noise reduction is carried out by effective noise floor of the collected ambient noise signal of target microphone.
The embodiment of the present application also provides a kind of feed-forward noise reduction system, comprising: at least two feedforward microphones and control circuit；
The windward side of at least two feedforward microphone is located at Different Plane, and at least two feedforward microphone is used for
Ambient noise signal is acquired, and the ambient noise signal is sent to the control circuit；
The control circuit is used for the energy of the collected ambient noise signal of at least two feedforward microphones,
Select the corresponding feedforward microphone of ambient noise signal for meeting energy requirement as target microphone, therefrom with the target wheat
Gram collected ambient noise signal of wind is that effective noise floor carries out feed forward noise reduction.
The embodiment of the present application also provides a kind of earphone, including feed-forward noise reduction system above-mentioned.
The embodiment of the present application also provides a kind of computer readable storage medium for storing computer instruction, when the computer
When instruction is executed by one or more processors, one or more of processors is caused to execute windproof method for de-noising above-mentioned.
In the embodiment of the present application, by being compared to the collected ambient noise signal of at least two feedforward microphones
And analysis, determine wind noise to the influence degree of each feedforward microphone, and by least two feedforward microphones by wind noise
The collected ambient noise signal of feedforward microphone institute that influence degree meets certain requirements carries out feedforward drop as effective noise floor
It makes an uproar.This can effectively reduce influence of the wind noise to feed forward noise reduction process, optimize feed forward noise reduction effect.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram for feed-forward noise reduction system that one embodiment of the application provides；
Fig. 2 is the structural schematic diagram for another feed-forward noise reduction system that one embodiment of the application provides；
Fig. 3 is the structural schematic diagram for another feed-forward noise reduction system that one embodiment of the application provides；
Fig. 4 is a kind of rigging position schematic diagram for feedforward microphone that one embodiment of the application provides；
Fig. 5 is a kind of flow diagram for windproof method for de-noising that another embodiment of the application provides.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
Conventionally, as feedforward microphone is directly exposed in external environment, therefore, it is highly susceptible to outer
The interference of boundary's environment, especially wind noise.This causes feed forward noise reduction process to be affected by wind noise, causes noise reduction effect
It is bad.For the technical problem, the embodiment of the present application provides a solution, and cardinal principle is: by before at least two
The feedback collected ambient noise signal of microphone is compared and is analyzed, and determines influence journey of the wind noise to each feedforward microphone
Degree, and the collected ambient noise signal of institute of the feedforward microphone to be met certain requirements by wind noise degree is as noise
Basis carries out feed forward noise reduction.This can effectively reduce influence of the wind noise to feed forward noise reduction process, optimize feed forward noise reduction effect.
Below in conjunction with attached drawing, the technical scheme provided by various embodiments of the present application will be described in detail.
Fig. 1 is a kind of structural schematic diagram for feed-forward noise reduction system that one embodiment of the application provides.As shown in Figure 1, this is
System includes: at least two feed forward noise reduction microphones and control circuit 20.
The windward side of at least two feedforward microphones 10 is located at Different Plane, and at least two feedforward microphones 10 are for acquiring
Ambient noise signal, and ambient noise signal is sent to control circuit 20；
Control circuit 20 is used to compare the energy of the collected ambient noise signal of at least two feedforward microphone 10, therefrom
Select the corresponding feedforward microphone 10 of the ambient noise signal for meeting energy requirement as target microphone, with target Mike's elegance
The ambient noise signal integrated carries out feed forward noise reduction as effective noise floor.
It is worth noting that the noise filter 30 and loudspeaker 40 in feed-forward noise reduction system are also shown in Fig. 1, due to this
In embodiment, noise filter 30 and loudspeaker 40 in existing feed-forward noise reduction system can be used to realize the technology of the present embodiment
Scheme, for example, noise filter 30 can be used preset filtering parameter to the collected ambient noise signal of target microphone into
Row filtering.Therefore, in the present embodiment, no longer the function of noise filter 30 and loudspeaker 40 is repeated.
Feed-forward noise reduction system provided in this embodiment, can be applied to noise cancelling headphone, and noise cancelling headphone can be wear-type or ear
Plug.Certainly other feed forward noise reduction scenes be can be also used for, for example, the feed forward noise reduction in automobile is handled, the present embodiment to this not
It limits.Below by emphasis using noise cancelling headphone (hereinafter referred to as " earphone ") as application scenarios to feedforward provided in this embodiment
Noise reduction system is described in detail.
In the present embodiment, feedforward microphone 10, which refers to, is exposed in external environment and can acquire extraneous ambient noise letter
Number microphone.In different application scenarios, feedforward microphone 10 may be assemblied in different positions, for example, feedforward Mike
Wind 10 may be mounted at outside the earmuff of earphone or outside the vehicle shell of automobile etc., and the present embodiment is not construed as limiting this.
Inventor has found in the course of the research: since feedforward microphone 10 is directly exposed in external environment, this leads to it
It is highly susceptible to the interference of external environment, especially wind noise.Wind noise is as caused by gas shock feedforward microphone 10
Airflow noise, therefore, the phase of wind noise be it is rambling, this leads to not to carry out equivalent reverse phase to wind noise and determination
De-noising signal is offset.When wind noise be fed forward the acquisition of microphone 10 and with the normal noises such as metro noise, aircraft noise
Together as feed forward noise reduction effective noise floor when, will lead to and contain a part in de-noising signal for offsetting the letter of wind noise
Number.And the signal for being used to offset wind noise will remain in sound chamber without being cancelled, moreover, the remaining signal in this part can also
Noise pollution is caused to sound chamber, influences user's audio experience.
In the present embodiment, at least two feedforward microphones 10 acquire ambient noise signal respectively, due at least two feedforwards
The windward side of microphone 10 is located at Different Plane, and therefore, for same wind noise, each feedforward microphone 10 is by wind noise shadow
Loud degree is different.For example, the feedforward microphone 10 vertical with wind direction for windward side, most by wind noise
Greatly, feedforward microphone 10 parallel to the wind direction for windward side is influenced almost to can be ignored by wind noise.Its
In, the windward side of feedforward microphone 10 refers to that it is exposed to the one side in external environment.For example, when feedforward microphone 10 is assemblied in
When in acoustic aperture, windward side is exposed to the one side in external environment after referring to the cladding by acoustic aperture, in this case, wheat of feedovering
The windward side of gram wind 10 is parallel with the plane where the aperture of acoustic aperture.Certainly, in different application scene, feedforward microphone 10 is met
Wind face can also be other faces, and the present embodiment is not construed as limiting this.
It has been observed that for same wind noise, since the angle of windward side is different, each feedforward microphone 10 is by wind noise
Effect is different.Wherein, in the present embodiment, can the collected ambient noise signal of each feedforward microphone 10 energy
Amount is different different by the degree of wind noise to embody each feedforward microphone 10.Accordingly, control circuit 20 can be according to each feedforward
The energy of the collected ambient noise signal of microphone 10, before therefrom selecting the ambient noise signal for meeting energy requirement corresponding
It presents microphone 10 and is used as target microphone.Wherein, energy requirement can be preset according to usage scenario.
Preferably, in the present embodiment, the smallest ambient noise letter of energy can be selected from least two feedforward microphones 10
Number corresponding feedforward microphone 10 is used as target microphone.The smallest ambient noise signal of energy mean wind noise therein at
It is point minimum, and the corresponding feedforward microphone 10 of the ambient noise signal be by the smallest feedforward microphone 10 of wind noise,
Influence of the wind noise to feed forward noise reduction can utmostly be reduced as the target microphone for participating in feed forward noise reduction.
Certainly, other energy requirements also can be used in the present embodiment and carrys out selection target microphone.For example, can be with minimum energy
Ambient noise signal number N as energy requirement.Control circuit 20 can be selected from least two feedforward microphones 10 and be adopted
N number of feedforward microphone 10 of the minimum energy of the ambient noise signal collected is used as microphone to be selected, then from microphone to be selected
In determine that feedforward microphone 10 is used as target microphone at random.The present embodiment is not construed as limiting this.
According to the target microphone selected, control circuit 20 can be made with the collected ambient noise signal of target microphone
For effective noise floor, de-noising signal is generated by the noise filter 30 in feed-forward noise reduction system, and broadcasts noise reduction by loudspeaker 40
Signal, to offset ambient noise signal, to realize feed forward noise reduction.
In above-mentioned or following embodiments, in order to determine the energy of the collected ambient noise signal of each feedforward microphone 10
Amount, control circuit 20 can carry out Fourier transformation to the collected ambient noise signal of at least two feedforward microphone 10, to obtain
Obtain the frequency spectrum of the collected ambient noise letter of at least two feedforward microphone 10；It is collected according at least two feedforward microphones 10
Ambient noise letter frequency spectrum, determine the energy of the collected ambient noise letter of at least two feedforward microphones 10 respectively.
It, can by carrying out Fourier transformation to the collected ambient noise signal of each feedforward microphone 10 in the present embodiment
Determine the frequency spectrum of each ambient noise signal.Control circuit 20 can determine that each environment is made an uproar by the frequency spectrum of each ambient noise signal
The energy of acoustical signal.Accordingly, control circuit 20 can determine each ambient noise letter according to the difference of the energy of each ambient noise signal
Number by wind noise degree difference, by the bigger ambient noise signal of wind noise degree, energy is also correspondingly got over
Greatly.
Fig. 2 is the structural schematic diagram for another feed-forward noise reduction system that one embodiment of the application provides.As shown in Fig. 2, due to
Wind noise is concentrated mainly on low-frequency range, in above-mentioned or following embodiments, can also increase low-pass filtering in feed-forward noise reduction system
Device 50, low-pass filter 50 are connected at least two feedforward microphones 10 and control circuit 20, and low-pass filter 50 is for receiving
The collected ambient noise signal of at least two feedforward microphone 10, can also be according to a default cutoff frequency respectively at least two
The collected ambient noise signal of feedforward microphone 10 carries out low-pass filtering.Wherein, default cutoff frequency can be according to design requirement
It is determined.Inventor has found that wind noise is concentrated mainly on 500HZ low-frequency range below, therefore, this implementation in the course of the research
In example, it is preferable that the default cutoff frequency of low-pass filter 50 can be set as 500HZ.
Accordingly, control circuit 20 can make an uproar to the collected environment after low-pass filtering of at least two feedforward microphone 10
Acoustical signal carries out Fourier transformation, to obtain the frequency spectrum of each ambient noise signal after low-pass filtering, and determines therefrom that low pass filtered
The energy of each ambient noise signal after wave, and, according to the energy of each ambient noise signal after low-pass filtering, therefrom select
The corresponding feedforward microphone 10 of ambient noise signal for meeting energy requirement is used as target microphone.
In the present embodiment, by low-pass filter 50, the collected ambient noise signal of each feedforward microphone 10 can be only taken
Middle low frequency signal is analyzed, this greatly reduces the operand of control circuit 20, can effectively improve arithmetic speed.
Fig. 3 is the structural schematic diagram for another feed-forward noise reduction system that one embodiment of the application provides.As shown in figure 3,
In above-mentioned or following embodiments, since the position of each feedforward microphone 10 is different, the corresponding acoustics of each feedforward microphone 10
Channel transfer function is different, in order to obtain more preferably noise reduction effect, can configure at least one noise reduction in feed-forward noise reduction system
Filter 30, to meet the noise reduction demand of different feedforward microphones 10.It can be each feedforward microphone in a kind of application scenarios
10 are respectively configured a noise filter 30, so that noise filter 30 can be based on the acoustical passage of its corresponding feedforward microphone 10
Transmission function and generate de-noising signal, to obtain optimal noise reduction effect.
Unlike the feed-forward noise reduction system provided in Fig. 1, in the present embodiment, it is no longer based on general noise filter
And de-noising signal is generated, but different noise filters is used for different feedforward microphones, so that de-noising signal
It is more matched with the collected ambient noise signal of target microphone.
In the present embodiment, control circuit 20 can be according to the corresponding acoustical passage transmission function of target microphone, from least one
The corresponding target noise filter 30 of target microphone is determined in a noise filter 30；It is generated using target noise filter 30
De-noising signal offseted with the collected ambient noise signal of target microphone, to realize feed forward noise reduction.To control circuit
20 can select the most matched target noise filter 30 of acoustical passage transmission function corresponding with target microphone.
For target noise filter 30, generated based on the corresponding acoustical passage transmission function of target microphone
When de-noising signal is broadcasted by loudspeaker 40, it perfect can offset the collected ambient noise of target microphone and be transferred to 40 position of loudspeaker
When be formed by offseting signal, to realize more preferably noise reduction effect.
In the present embodiment, acoustical passage is transmitted caused by fully taking into account the rigging position difference of each feedforward microphone 10
The difference of function is collected to generate with target microphone by selection and the most matched noise filter 30 of target microphone
The most matched de-noising signal of ambient noise signal can effectively improve user's audio experience to realize more preferably noise reduction effect.
In the present embodiment, digital filter or Virtual Filters are can be used in feed-forward noise reduction system.When using digital filter
When, at least one noise filter 30 can be realized by saving at least one set of filter parameter；When using Virtual Filters,
At least one noise filter 30 can be realized by designing at least one filter circuit.
Fig. 4 is a kind of rigging position schematic diagram for feedforward microphone that one embodiment of the application provides.As shown in figure 4, extremely
Few two feedforward microphones are located at outside the first earmuff, and the first earmuff is any earmuff of earphone, are provided with outside the first earmuff
At least two acoustic aperture, each feedforward microphone correspondence are assemblied in an acoustic aperture, the windward side of each feedforward microphone and its institute
Acoustic aperture aperture it is parallel, the aperture of at least two acoustic aperture is located at Different Plane.
In the present embodiment, can assemble feed-forward noise reduction system in each earmuff of earphone correspondingly can be in each ear of earphone
Cover is external to be arranged at least two feedforward microphones.
In addition, the noise reduction effect of two earmuffs in order to guarantee earphone is consistent, it can be by the feedforward microphone on two earmuffs
Rigging position be set as symmetrically, in this way, same wind noise can be realized consistent noise reduction effect in two earmuffs, be had
Effect optimizes user experience.
Below by the feedforward for two feedforward microphones to be respectively set outside each earmuff in earphone, to the application
Noise reduction system is described in detail.
Since the treatment process of the feed-forward noise reduction system in the left and right earmuff in Fig. 4 is similar, below only to ear left in Fig. 4
It covers corresponding feed-forward noise reduction system to be described, it should be appreciated that the corresponding feed-forward noise reduction system of right earcup can refer to a left side
The description of the corresponding feed-forward noise reduction system of earmuff.
As shown in figure 4, there are two feedforward microphones for setting outside left earmuff, it is respectively designated as L_A and L_B, L_A and L_B
The aperture of the acoustic aperture at place is not in same plane.
In earphone use process, L_A and L_B can acquire ambient noise signal respectively, and low-pass filter is according to cutoff frequency
Rate 500HZ carries out low-pass filtering to the collected ambient noise signal of L_A and L_B, the ring after obtaining the corresponding low-pass filtering of L_A
Ambient noise signal L_B_SNG_L after the corresponding low-pass filtering of border noise signal L_A_SNG_L and L_B.Control circuit difference
Fourier transformation is carried out to L_A_SNG_L and L_B_SNG_L, obtains the frequency spectrum of L_A_SNG_L and L_B_SNG_L, and according to L_
The frequency spectrum of A_SNG_L and L_B_SNG_L determines the energy of L_A_SNG_L and L_B_SNG_L.Control circuit compares L_A_SNG_L
, if energy A=B, show do not have when energy=L_B_SNG_L energy of L_A_SNG_L with the energy of L_B_SNG_L
In wind to microphone, then Flag=1 is exported；When energy > L_B_SNG_L energy of L_A_SNG_L, then show L_A master
Wind is received, then exports Flag=2；When energy < L_B_SNG_L energy of L_A_SNG_L, then show that L_B is main
Wind is received, then exports Flag=3.Value of the control circuit according to the Flag of output, selection target microphone, specifically: if
Flag=1 chooses L_A as target microphone (default uses L_A)；If Flag=2, L_A is chosen as target microphone；If
Flag=3 chooses L_B as target microphone.Later, control circuit can determine that its is corresponding according to the target microphone of selection
Target noise filter, target noise filter generate de-noising signal according to the collected ambient noise signal of target microphone,
And broadcasted by loudspeaker, to realize feed forward noise reduction.
Fig. 5 is a kind of flow diagram for windproof method for de-noising that another embodiment of the application provides.The radix saposhnikoviae method for de-noising is suitable
For the control circuit in feed-forward noise reduction system.As shown in figure 5, this method comprises:
500, the collected ambient noise signal of at least two feedforward microphones is obtained, at least two feedforward microphones are met
Wind face is located at Different Plane；
501, according to the energy of the collected ambient noise signal of at least two feedforward microphones, therefrom selection meets energy
It is required that the corresponding feedforward microphone of ambient noise signal as target microphone；
502, feed forward noise reduction is carried out by effective noise floor of the collected ambient noise signal of target microphone.
In the present embodiment, by the way that the collected ambient noise signal of at least two feedforward microphones is compared and is divided
Analysis, determine wind noise to the influence degree of each feedforward microphone, and to be met certain requirements by wind noise degree before
The collected ambient noise signal of microphone institute is presented as effective noise floor, carries out feed forward noise reduction.This can effectively reduce wind noise pair
The influence of feed forward noise reduction process optimizes feed forward noise reduction effect.
In an alternative embodiment, step 501, comprising:
Therefrom select the corresponding feedforward microphone of the smallest ambient noise signal of energy as target microphone.
In an alternative embodiment, before step 501, further includes:
Fourier transformation is carried out to the collected ambient noise signal of at least two feedforward microphones, to obtain at least two
The frequency spectrum of the collected ambient noise letter of feedforward microphone；
According to the frequency spectrum of the collected ambient noise letter of at least two feedforward microphones, at least two feedforward wheats are determined respectively
The energy of the collected ambient noise letter of gram wind.
In an alternative embodiment, step carries out in Fu the collected ambient noise signal of at least two feedforward microphones
Leaf transformation, comprising:
The collected ambient noise signal of at least two feedforward microphones is carried out respectively according to a default cutoff frequency low
Pass filter；
The ambient noise signal after low-pass filtering collected at least two feedforward microphones carries out Fourier's change
It changes.
In an alternative embodiment, at least two feedforward microphones are located at outside the first earmuff, and the first earmuff is earphone
Any earmuff is provided at least two acoustic aperture outside the first earmuff, and each feedforward microphone correspondence is assemblied in an acoustic aperture, often
The windward side of a feedforward microphone is parallel with the aperture of the acoustic aperture where it, and the aperture of at least two acoustic aperture is located at Different Plane.
In an alternative embodiment, step 502, comprising:
According to the corresponding acoustical passage transmission function of target microphone, target wheat is determined from least one noise filter
Gram corresponding target noise filter of wind；
It is offseted using the de-noising signal that target noise filter generates with the collected ambient noise signal of target microphone
Disappear, to realize feed forward noise reduction.
In an alternative embodiment, noise filter uses digital filter or analog filter.
A kind of earphone is also provided in the another embodiment of the application, including the feed forward noise reduction system provided in foregoing embodiments
System.Wherein, Fig. 4 shows a kind of contour structures of earphone in the present embodiment, when it should be understood that in the embodiment of the present application
Earphone can also use other contour structures, for example, In-Ear.The present embodiment does not limit this.
Correspondingly, the embodiment of the present application also provides a kind of computer readable storage medium for being stored with computer program, meter
Calculation machine program, which is performed, can be realized the above-mentioned each step executed by control circuit.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
In a typical configuration, calculating equipment includes one or more processors (CPU), input/output interface, net
Network interface and memory.
Memory may include the non-volatile memory in computer-readable medium, random access memory (RAM) and/or
The forms such as Nonvolatile memory, such as read-only memory (ROM) or flash memory (flash RAM).Memory is computer-readable medium
Example.
Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be by any method
Or technology come realize information store.Information can be computer readable instructions, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase change memory (PRAM), static random access memory (SRAM), moves
State random access memory (DRAM), other kinds of random access memory (RAM), read-only memory (ROM), electric erasable
Programmable read only memory (EEPROM), flash memory or other memory techniques, read-only disc read only memory (CD-ROM) (CD-ROM),
Digital versatile disc (DVD) or other optical storage, magnetic cassettes, tape magnetic disk storage or other magnetic storage devices
Or any other non-transmission medium, can be used for storage can be accessed by a computing device information.As defined in this article, it calculates
Machine readable medium does not include temporary computer readable media (transitory media), such as the data-signal and carrier wave of modulation.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
It include so that the process, method, article or equipment for including a series of elements not only includes those elements, but also to wrap
Include other elements that are not explicitly listed, or further include for this process, method, article or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described want
There is also other identical elements in the process, method, article or equipment of element.
The above description is only an example of the present application, is not intended to limit this application.For those skilled in the art
For, various changes and changes are possible in this application.All any modifications made within the spirit and principles of the present application are equal
Replacement, improvement etc., should be included within the scope of the claims of this application.
Claims (12)
1. a kind of radix saposhnikoviae method for de-noising characterized by comprising
Obtain the collected ambient noise signal of at least two feedforward microphones, the windward side of at least two feedforward microphone
Positioned at Different Plane；
According to the energy of the collected ambient noise signal of at least two feedforward microphones, therefrom selection meets energy requirement
The corresponding feedforward microphone of ambient noise signal as target microphone；
Feed forward noise reduction is carried out by effective noise floor of the collected ambient noise signal of target microphone.
2. the method according to claim 1, wherein the therefrom selection meets the ambient noise letter of energy requirement
Number corresponding feedforward microphone is as target microphone, comprising:
Therefrom select the corresponding feedforward microphone of the smallest ambient noise signal of energy as the target microphone.
3. the method according to claim 1, wherein meeting the ambient noise signal of energy requirement in therefrom selection
Before corresponding feedforward microphone is as target microphone, further includes:
Fourier transformation is carried out to the collected ambient noise signal of at least two feedforward microphone, it is described at least with acquisition
The frequency spectrum of the collected ambient noise letter of two feedforward microphones；
According to the frequency spectrum of the collected ambient noise letter of at least two feedforward microphone, before determining described at least two respectively
Present the energy of the collected ambient noise letter of microphone.
4. according to the method described in claim 3, it is characterized in that, described collected at least two feedforward microphone
Ambient noise signal carries out Fourier transformation, comprising:
The collected ambient noise signal of at least two feedforward microphone is carried out respectively according to a default cutoff frequency low
Pass filter；
The ambient noise signal after low-pass filtering collected at least two feedforward microphone carries out Fourier's change
It changes.
5. the method according to claim 1, wherein at least two feedforward microphone is located at outside the first earmuff
Portion, first earmuff are any earmuff of earphone, are provided at least two acoustic aperture, each feedforward wheat outside first earmuff
Gram wind correspondence is assemblied in an acoustic aperture, and the windward side of each feedforward microphone is parallel with the aperture of the acoustic aperture where it,
The aperture of at least two acoustic aperture is located at Different Plane.
6. the method according to claim 1, wherein described with the collected ambient noise of target microphone
Signal is that effective noise floor carries out feed forward noise reduction, comprising:
According to the corresponding acoustical passage transmission function of target microphone, the target wheat is determined from least one noise filter
Gram corresponding target noise filter of wind；
The de-noising signal and the collected ambient noise signal of target microphone generated using the target noise filter
It offsets, to realize feed forward noise reduction.
7. according to the method described in claim 6, it is characterized in that, the target noise filter uses digital filter or mould
Quasi- filter.
8. a kind of feed-forward noise reduction system characterized by comprising at least two feedforward microphones and control circuit；
The windward side of at least two feedforward microphone is located at Different Plane, and at least two feedforward microphone is for acquiring
Ambient noise signal, and the ambient noise signal is sent to the control circuit；
The control circuit is used for the energy of the collected ambient noise signal of at least two feedforward microphones, therefrom
Select the corresponding feedforward microphone of the ambient noise signal for meeting energy requirement as target microphone, with the target microphone
Collected ambient noise signal is that effective noise floor carries out feed forward noise reduction.
9. system according to claim 8, which is characterized in that further include low-pass filter；
The low-pass filter is used for collected at least two feedforward microphone respectively according to a default cutoff frequency
Ambient noise signal carries out low-pass filtering；
The control circuit therefrom select the corresponding feedforward microphone of the ambient noise signal for meeting energy requirement as target
Before microphone, for the collected ambient noise signal after low-pass filtering of at least two feedforward microphone into
Row Fourier transformation, to obtain the frequency spectrum of the collected ambient noise letter of at least two feedforward microphone；According to it is described extremely
The frequency spectrum of few collected ambient noise letter of two feedforward microphones, determines that at least two feedforward microphone collects respectively
Ambient noise letter energy.
10. system according to claim 8, which is characterized in that further include at least one noise filter；
The control circuit is also used to according to the corresponding acoustical passage transmission function of target microphone, from least one described noise reduction
The corresponding target noise filter of the target microphone is determined in filter；
The target noise filter is offset the target microphone by the de-noising signal and is acquired for generating de-noising signal
The ambient noise signal arrived, to realize feed forward noise reduction.
11. a kind of earphone, which is characterized in that including the described in any item feed-forward noise reduction systems of claim 8~10.
12. a kind of computer readable storage medium for storing computer instruction, which is characterized in that when the computer instruction is by one
When a or multiple processors execute, one or more of processor perform claims is caused to require 1~7 described in any item radix saposhnikoviaes
Method for de-noising.
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