CN108495227A - Active denoising method, active noise reduction system and earphone - Google Patents
Active denoising method, active noise reduction system and earphone Download PDFInfo
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- CN108495227A CN108495227A CN201810520167.9A CN201810520167A CN108495227A CN 108495227 A CN108495227 A CN 108495227A CN 201810520167 A CN201810520167 A CN 201810520167A CN 108495227 A CN108495227 A CN 108495227A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Abstract
A kind of active denoising method of present invention proposition, active noise reduction system and earphone, are related to active noise reduction field, which includes：Obtain the transaudient characteristic model of earphone secondary channel；According to the transaudient characteristic of the duct of user, processing is modified to the pre-set filter, obtains revised filter；Wherein, the filter is to be generated based on the transaudient characteristic model of the earphone secondary channel.This method in such a way that on-line amending is combined, realizes the anti-acoustic capability optimization of the transaudient characteristic of duct based on different earphone wearers offline design.Compared with existing adaptive active denoising method, this method on-line calculation is small, and the calculating time is short, efficiently solves the problems, such as that phase deviation caused by calculating time length is big, and this method is simple, is easy to Project Realization.
Description
Technical field
The present invention relates to active noise reduction fields, in particular to a kind of active denoising method, active noise reduction system and ear
Machine.
Background technology
Active noise reduction earphone is a kind of effective device for reducing ambient noise, is sent out and ambient noise width by secondary sound source
It is worth equal, the de-noising sound wave of opposite in phase, realizes that the elimination of noise, the phase characteristic of de-noising sound wave will have a direct impact on noise reduction effect
Fruit.In the narrow enclosure space that earphone, auricle and duct are formed, the individual difference of human ear can cause the deviation of phase.It is right
In the fixed filter of parameter designed based on transaudient characteristic of the noise in earphone enclosure space, the on the one hand meeting of above-mentioned deviation
The consistency of anti-acoustic capability is caused to decline；On the other hand, reverse phase noise reduction sound wave may be caused to become same phase noise reduction sound wave and occur
The case where Noise enhancement.
To overcome the problems, such as that the fixed filter of above-mentioned parameter is brought, the prior art is realized optimal using sef-adapting filter
Noise reduction.A kind of method and system of active noise reduction (201510629511.4) of patent, proposes a kind of self-adaptation noise reduction method,
So that active noise reduction can be with the physical responses of adaptive speaker to observation point.For active noise reduction earphone, loud speaker to feedback
The physical responses of microphone can reflect propagation characteristic of the noise in earphone, theoretically, patent 201510629511.4 can gram
Above-mentioned phase deviation problem is taken, but since self-adaptation noise reduction method is a kind of Photographing On-line method, digital filtering need to be used
Device, huge calculation amount can cause longer time to postpone, and add the circuit delay of digital filter itself, total time delay
The phase deviation amount of the filter brought equally can not be ignored.
Invention content
In view of the above-mentioned problems, a kind of active denoising method of present invention proposition, active noise reduction system and earphone, online to solve
Phase difference caused by time length is calculated, and then the problem of the anti-acoustic capability deterioration of appearance.
In a first aspect, the embodiment of the present application provides a kind of active denoising method, including：
Obtain the transaudient characteristic model of earphone secondary channel；
According to the transaudient characteristic of the duct of user, processing is modified to pre-set filter, obtains revised filter
Wave device；Wherein, the filter is to be generated based on the transaudient characteristic model of the earphone secondary channel.
Optionally, the transaudient characteristic model G0 of acquisition earphone secondary channel, including：
Input data based on earphone secondary channel and output data establish the transaudient characteristic model of earphone secondary channel.
Optionally, the filter include feedforward filter, feedback filter and feedforward with feedback complex formula filter in
Any one.
Optionally, according to the transaudient characteristic of the duct of user, processing is modified to the pre-set filter, is obtained
Revised filter, including：
Determine the transaudient characteristic model of the duct of user and the transaudient characteristic model library of duct；
The transaudient characteristic model of duct and the transaudient characteristic model library of the duct of the user are calculated using similarity algorithm
In any model similarity, obtain the model in the similarity highest transaudient characteristic model library of duct；
Based on the model, correction wave filter is determined, be based on filter and correction wave filter, obtain revised filtering
Device.
Optionally, the similarity algorithm includes：
To the corresponding frequency response curve of the transaudient characteristic model of the duct of the user and the transaudient characteristic model library pair of the duct
A curve in the frequency response curve race answered carries out registration process, the curve after being aligned；
Calculate the similarity of the curve after the alignment and the curve in the frequency response curve race.
Optionally, the corresponding frequency response curve of the transaudient characteristic model of the duct to the user and the transaudient spy of the duct
Property the corresponding frequency response curve race of model library in a curve carry out registration process, including：
Determine parameter k so that | | li-k*l | |2It is minimum；
Wherein, the transaudient characteristic model library { G of ducti' in corresponding frequency response curve race, carry out the song of similarity algorithm processing
Line, l are the corresponding frequency response curve of the transaudient characteristic model of duct, and k is real number.
Optionally, the similarity is Sn=| | li-k*l | |2；
Wherein, Sn is the similarity of the curve l ' and the curve li in frequency response curve race after alignment.
Optionally, described to be based on the model, it determines correction wave filter, is based on filter and correction wave filter, obtains
Revised filter, including：
For the transaudient characteristic model library of the duct, corresponding correction wave filter library is established；
According to the transaudient characteristic model of the duct of the user in the transaudient characteristic model library of the duct corresponding model, really
Correction wave filter in the fixed corresponding modification filter bank.
Second aspect, the embodiment of the present application provide a kind of active noise reduction system, including：Noise-measuring system, transaudient dress
It sets, filter circuit, correct circuit；
The noise-measuring system includes：First input end, the first output end and second output terminal；
The filter circuit includes：First input end, the second input terminal and the first output end；
The sound-conducting apparatus includes：First input end, the second input terminal, the first output end and second output terminal；
The amendment circuit includes：First input end, the second input terminal, the first output end and second output terminal；
First output end of the noise-measuring system is electrically connected with the first input end of the filter circuit, described to make an uproar
The second output terminal of electroacoustic measurement apparatus is electrically connected with the first input end for correcting circuit；
The first input end of the filter circuit is electrically connected with the first output end of the noise-measuring system, institute
Second input terminal and first output end for correcting circuit for stating filter circuit are electrically connected, the institute of the filter circuit
The first input end for stating the first output end and the sound-conducting apparatus is electrically connected；
The first input end of the sound-conducting apparatus and the first output end of the filter circuit are electrically connected, the transaudient dress
Second input terminal set is electrically connected with the second output terminal for correcting circuit, and described the second of the sound-conducting apparatus is defeated
Outlet is electrically connected with second input terminal for correcting circuit；
The second output terminal of the first input end for correcting circuit and the noise-measuring system is electrically connected, described to repair
Second input terminal of positive circuit and the second output terminal of the sound-conducting apparatus are electrically connected, described to correct described the of circuit
Second input terminal of one output end and the filter circuit is electrically connected, the second output terminal for correcting circuit with it is described
Second input terminal of sound-conducting apparatus is electrically connected；
The noise-measuring system is used for detected noise signal；
The filter circuit, for generating noise cancellation signal；
The sound-conducting apparatus, for converting the electrical signal to acoustical signal；
The amendment circuit, the filter for correcting filter circuit.
Optionally, the filter circuit includes analog to digital conversion circuit, filter and D/A converting circuit, the filter point
It is not electrically connected with analog-digital conversion circuit as described, the D/A converting circuit.
Optionally, the filter be feedforward filter, feedback filter and feedforward with feedback complex formula filter in
Any one.
Optionally, the amendment circuit includes trigger circuit, storage circuit, counting circuit and analysis circuit；
The trigger circuit includes the first output end, second output terminal and third output end；
The counting circuit includes first input end, the second input terminal, third input terminal and the first output end；
The analysis circuit includes first input end, the second input terminal and the first output end；
First output end of the trigger circuit is connect with the second input terminal of the sound-conducting apparatus, the trigger circuit
The input terminal of the second output terminal and the storage circuit is electrically connected, the third output end of the trigger circuit and institute
The first input end for stating counting circuit is electrically connected；
Three output ends of the first input end of the counting circuit and the trigger circuit the are electrically connected, and calculatings is electric
Second input terminal on road and the second output terminal of the noise-measuring system are electrically connected, and described the of the counting circuit
The second output terminal of three input terminals and the sound-conducting apparatus is electrically connected；
The input terminal of the storage circuit and the second output terminal of the trigger circuit are electrically connected, the storage circuit
Output end and the first input end of the analysis circuit are electrically connected；
The first input end of the analysis circuit and the output end of the storage circuit are electrically connected, the analysis circuit
First output end of second input terminal and the counting circuit is electrically connected, first output end of the analysis circuit
It is electrically connected with the second input terminal of the filter circuit；
The trigger circuit sends out acoustical signal for triggering the sound-conducting apparatus, and trigger simultaneously the counting circuit with
The storage circuit；
The counting circuit, the transaudient characteristic of duct for calculating active user；
The storage circuit, for storing the transaudient performance data of a variety of ducts and corresponding filter parameter data；
The analysis circuit, for analyzing the filter parameter for being suitable for the transaudient characteristic of duct of active user.
The third aspect, the embodiment of the present application provides a kind of earphone, including trigger switch, for triggering trigger circuit.
A kind of active denoising method of present invention proposition, active noise reduction system and earphone, are related to active noise reduction field, this is actively
Noise-reduction method includes：Obtain the transaudient characteristic model of earphone secondary channel；According to the transaudient characteristic of the duct of user, to pre-set
The filter is modified processing, obtains revised filter；Wherein, the filter is logical based on the earphone secondary
The transaudient characteristic model in road generates.This method in such a way that on-line amending is combined, is realized based on difference offline design
The anti-acoustic capability of the transaudient characteristic of duct of earphone wearer optimizes.Compared with existing adaptive active denoising method, this method
On-line calculation is small, and the calculating time is short, efficiently solves the problems, such as that phase deviation caused by calculating time length is big, and this method letter
It is single, it is easy to Project Realization.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 shows a kind of active denoising method flow chart that the embodiment of the present invention 1 provides；
Fig. 2 shows a kind of active noise reduction system structural schematic diagrams that the embodiment of the present invention 2 provides；
Fig. 3 shows a kind of filter circuit construction schematic diagrame that the embodiment of the present invention 2 provides；
Fig. 4 shows a kind of amendment electrical block diagram that the embodiment of the present invention 2 provides.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to the technology of the present invention
Scheme carries out clear, complete description.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than complete
The embodiment in portion.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second " and " third " is only used for description mesh
, it is not understood to indicate or imply relative importance.Unless otherwise clearly defined and limited, term " connection ", " phase
It even " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connects, and can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two members
Connection inside part.For the ordinary skill in the art, it can understand above-mentioned term in the present invention with concrete condition
Concrete meaning.
Embodiment 1
Active denoising method flow chart as shown in Figure 1, the present invention proposes a kind of active denoising method, including walks as follows
Suddenly：
S10：Obtain the transaudient characteristic model G0 of earphone secondary channel；
S20：According to the transaudient characteristic G0 of the duct of user, processing is modified to pre-set filter H0, is repaiied
Filter H1 after just；Wherein, the filter H0 is to be generated based on the transaudient characteristic model G0 of the earphone secondary channel.
Above-mentioned active denoising method, the method for obtaining the transaudient characteristic model of earphone secondary channel have detailed in the prior art
Thin introduction, is no longer excessively illustrated herein；Step S10 and step S20 is offline foundation and offline design, step S20 are
Canbe used on line, this be it is a kind of offline with the active denoising method that is combined online, compared with the adaptive design method of all on-line,
Calculation amount is obviously reduced, and calculates time shortening, and phase deviation also effectively reduces.
Above-mentioned steps S10 includes：It is transaudient to establish earphone secondary channel for input data based on secondary channel and output data
Characteristic model is used in combination transmission function formula G0 to indicate.Preferably, input time domain data and the output for obtaining secondary channel are measured respectively
Time domain data establishes the transaudient characteristic model of earphone secondary channel, and G0 is indicated when transmission function is used in combination, G0 (s)=B1(s)/A1(s),
Wherein, B1(s) Laplace transform for characterizing output data is molecule, the A of algebraic expression G0 (s)1(s) drawing of input data is characterized
Laplace transform, is the denominator polynomials of algebraic expression G0 (s), and s indicates differential operator, B is determined using least square class method1
(s)、A1(s) order and parameter.
In above-mentioned steps S20, filter includes feedforward filter, feedback filter and feedforward and feedback complex formula filter
In any one.For feedforward filter H0FF, can be determined by solving following problem：I.e. so that ‖ G1-G0 × H0FF‖2It is minimum
H0FF.Wherein, G1 is the transmission function expression formula of the transaudient characteristic model in main channel, and time domain number must be inputted by measuring main channel
According to, output time-domain data, least square class method is utilized to obtain.For feedback filter H0FB, can be true by solving following problem
It is fixed：I.e. so that 1/ (1-G0 × H0 of ‖FB)‖2Minimum feedback filter H0FB.For feedforward and feedback complex formula filter, can divide
Feedforward filter and feedback filter are not sought, and method for solving and above-mentioned individual feedforward filter are identical as feedback filter.
Above-mentioned steps S20 includes the following steps S201 to step S203：
S201：Determine the transaudient characteristic model G ' of the duct of user and the transaudient characteristic model library { G of ducti', wherein i=1,
2 ... n are the positive integer more than or equal to 1, are the set of the transaudient characteristic model of duct of n user；
S202：The transaudient characteristic model G ' of duct and the transaudient characteristic of the duct of the user are calculated using similarity algorithm
Model library { Gi' in any model similarity, obtain the similarity highest transaudient characteristic model library { G of ducti' in
Model Gi’；
S203：Model Gi ' based on acquisition, determines correction wave filter H ', is based on filter H0 and correction wave filter H ',
Obtain revised filter H1=H0 × H '.
In above-mentioned steps S201, the transaudient characteristic model G ' of earphone user's duct is to determine online, the transaudient characteristic of duct
Model library { Gi ' } is offline design, and online determination and offline design have detailed introduction in the prior art, herein no longer into
The excessive explanation of row.
Earphone is preferably based on during active user wears, establishes the secondary based on the transaudient characteristic of the user ear canal
The transaudient characteristic model G1 (s) in channel, while being based on the above-mentioned transaudient characteristic model G0 (s) of earphone secondary channel, the then ear of the user
The transaudient characteristic model G ' in road is represented by G '=G1 (s)/G0 (s)；For the transaudient characteristic model library of duct { Gi ' }, it is based respectively on
The earphone wearer of different duct characteristics obtains the transaudient characteristic model G of secondary channel of each earphone weareri(s), it is based on ear
The transaudient characteristic model G0 (s) of machine secondary channel, you can obtain transaudient characteristic model library { Gi ' }={ G of ducti(s)/G0(s)}.Its
In, s indicates differential operator.
In above-mentioned steps S202, the transaudient characteristic model G ' of duct based on user and the transaudient characteristic model library { Gi ' } of duct,
Using similarity algorithm, the corresponding frequency response curve l of the transaudient characteristic model G ' of duct and the transaudient characteristic of the duct of user are calculated
The similarity of any frequency response curve in the corresponding frequency response curve race { li ' } of model library { Gi ' } obtains the highest ear of similarity
The corresponding model Gi ' of frequency response curve in the transaudient characteristic model library { Gi ' } in road.
Similarity algorithm in above-mentioned steps S202 includes the following steps S2021 and step S2022：
S2021：The corresponding frequency response curve l of characteristic model G ' transaudient to the duct of the user and the transaudient characteristic model of duct
A curve li in the corresponding frequency response curve race in library { Gi ' } carries out registration process, the curve l ' after being aligned；
S2022：Calculate the similarity of the curve l ' after the alignment and the curve li in frequency response curve race.
Wherein, alignment includes determining parameter k so that | | li-k*l | |2It is minimum.
Wherein, li is the transaudient characteristic model library { G of ducti' in corresponding frequency response curve race, carry out similarity algorithm processing
Curve, l be the corresponding frequency response curves of the transaudient characteristic model G ' of duct, k is real number.
Above-mentioned similarity is Sn=| | li-k*l | |2。
Wherein, Sn is the similarity of the curve l ' and the curve li in frequency response curve race after alignment.
By the way that the transaudient characteristic frequency response curve l of the duct of active user is corresponding with duct transaudient characteristic model library { Gi ' }
After all frequency response curve li alignment in frequency response curve race, the curve l ' after alignment and the curve li's in frequency response curve race are calculated
Similarity, by the formula of similarity Sn it is found that Sn is smaller, similarity degree is higher.The minimum corresponding frequency response curve of value is selected,
The transaudient characteristic model of the corresponding duct of the frequency response curve is the transaudient characteristic model of duct of the currently used person of the earphone.Model library
Number of Models in { Gi ' } is more, and the transaudient characteristic model of current earphone user's duct according to its determination is more accurate, but calculation amount
Also can therefore increase, noise reduction system delay can also increase.Number of Models value in model library need to be real according to actual conditions and engineering
It tramples difficulty and effect determines.
Above-mentioned steps S203 includes the following steps S2031 and S2032：
S2031：For the transaudient characteristic model library { Gi ' } of the duct, corresponding correction wave filter library { Hi ' } is established, often
The transaudient characteristic model of one duct corresponds to a correction wave filter；
S2032：According to the transaudient characteristic model G ' of the duct of the user in the transaudient characteristic model library { Gi ' } of the duct
Corresponding model Gi ' determines the correction wave filter H ' in the corresponding correction wave filter library { Hi ' }.
In above-mentioned steps S2031, filter type is consistent with the filter type in step S20.For model
Each model Gi ' in library { Gi ' } designs filter.For feedforward filter Hi 'FF, can be true by solving following problem
It is fixed：I.e. so that ‖ G1-Gi ' × H0FF‖2Minimum Hi 'FF.Wherein, G1 is that the transmission function of the transaudient characteristic model in main channel is expressed
Formula must input time domain data and output time-domain data by measuring main channel, be obtained using least square class method.For feedback
Filter Hi 'FB, can be determined by solving following problem：I.e. so that the (1-Gi ' × Hi ' of ‖ 1/FB)‖2Minimum Hi 'FB.For preceding
Feedback and feedback complex formula filter, can seek feedforward filter and feedback filter respectively, method for solving with it is above-mentioned individually before
It is identical as feedback filter to present filter.
In step S2032, model Gi ' and the filter Hi ' in filtering library { Hi ' } in model library { Gi ' } is one by one
Corresponding, once the model Gi ' in model library { Gi ' } is determined, then the corresponding filter Hi ' of model Gi ' are also determined.It corrects
Filter is H '=Hi '/H0.By correction wave filter H ', former filter H0 is modified to Hi ', is realized based on different use
The transaudient characteristic of duct at family is adapted to different filters online.
Embodiment 2
Active noise reduction system structural schematic diagram as shown in Figure 2, the present invention propose a kind of active noise reduction system, can be used for reality
The active denoising method proposed in current embodiment 1, including noise-measuring system 100, filter circuit 200, sound-conducting apparatus 300, repair
Positive circuit 400.
Noise-measuring system 100 includes first input end, the first output end and second output terminal.
Filter circuit 200 includes first input end, the second input terminal and the first output end.
Sound-conducting apparatus 300 includes first input end, the second input terminal, the first output end and second output terminal.
It includes first input end, the second input terminal, the first output end and second output terminal to correct circuit 400.
First output end of noise-measuring system 100 is electrically connected with the first input end of filter circuit 200, noise testing
100 second output terminal of device is electrically connected with the first input end for correcting circuit 400.
The first input end of filter circuit 200 is electrically connected with the first output end of noise-measuring system 100, filter circuit
200 the second input terminal is electrically connected with the first output end for correcting circuit 400, the first output end and the biography of filter circuit 200
The first input end of acoustic device 300 is electrically connected.
The first input end of sound-conducting apparatus 300 is electrically connected with the first output end of filter circuit 200, sound-conducting apparatus 300
The second input terminal be electrically connected with the second output terminal for correcting circuit 400, the second output terminal of sound-conducting apparatus 300 with correct electricity
Second input terminal on road 400 is electrically connected.
The second output terminal of the first input end and noise-measuring system 100 of correcting circuit 400 is electrically connected, and corrects circuit
400 the second input terminal is electrically connected with the second output terminal of sound-conducting apparatus 300, corrects the first output end and the filter of circuit 400
Second input terminal of wave circuit 200 is electrically connected, and corrects the second output terminal of circuit 400 and the second input of sound-conducting apparatus 300
End is electrically connected.
Noise-measuring system 100 is used for detected noise signal.
Filter circuit 200 is for generating noise cancellation signal.
Sound-conducting apparatus 300 is for converting the electrical signal to acoustical signal；
Correct the filter that circuit 400 is used to correct filter circuit.
In one embodiment, above-mentioned active noise reduction system includes modification model and noise reduction mode；Modification model is ear
Machine wears initial stage, is modified to filter；Noise reduction mode is to carry out noise reduction process to ambient noise after filter is corrected.It is right
It in modification model, corrects circuit 400 and sends out trigger signal, trigger signal triggering sound-conducting apparatus 300 sends out acoustical signal, noise inspection
It surveys device 100 and detects above-mentioned acoustical signal, and convert the acoustical signal to electric signal, the input of the electric signal and sound-conducting apparatus 300
Electric signal is transmitted to amendment circuit, corrects circuit counting and exports correction wave filter, and current filter is corrected with the correction wave filter
Wave device.For noise reduction mode, noise detection apparatus 100 is by the noise signal transmission of detection to filter circuit 200, filtered electricity
Road 200 exports noise cancellation signal after handling, which is transmitted to sound-conducting apparatus 300, and acoustical signal is converted to through sound-conducting apparatus 300
After broadcast, obtain de-noising sound wave.
In one embodiment, filter construction schematic diagram as shown in Figure 3, filter circuit 200 include analog-to-digital conversion
Circuit 210, filter 220 and D/A converting circuit 230.The filter 220 respectively with analog-digital conversion circuit as described 210, institute
The electric connection of D/A converting circuit 230 is stated, which is digital filter circuit, facilitates filter parameter online
Modification.
In one embodiment, with continued reference to Fig. 3, above-mentioned filter is feedforward filter 222, feedback filter 221
And any one in feedforward and feedback complex formula filter.Feedforward filter can be separately designed with feedback filter.
In one embodiment, amendment electrical block diagram as shown in Figure 4, including trigger circuit 410, storage electricity
Road 420, counting circuit 430 and analysis circuit 440.
Trigger circuit 410 includes the first output end in1, second output terminal in2 and third output end in3.
Counting circuit 430 includes first input end in1, the second input terminal in2, third input terminal in3 and the first output end
out1。
Analysis circuit 440 includes first input end in1, the second input terminal in2 and the first output end out1.
First output end out1 of trigger circuit 410 and the second input terminal in2 of sound-conducting apparatus 300 are electrically connected, triggering
The second output terminal out2 of circuit 410 is electrically connected with the input terminal of storage circuit 420, the third output end of trigger circuit 410
The first input end in1 of out3 and counting circuit 430 are electrically connected.
The first input end in1 of counting circuit 430 and the third output end out3 of trigger circuit 410 are electrically connected, and are calculated
Second input terminal in2 of circuit 430 and the second output terminal out2 of noise-measuring system 100 are electrically connected, counting circuit 430
Third input terminal in3 and the second output terminal out2 of sound-conducting apparatus 300 are electrically connected.
The input terminal of storage circuit 420 and the second output terminal out2 of trigger circuit 410 are electrically connected, storage circuit 420
440 first input end in1 of output end and analysis circuit be electrically connected.
The first input end in1 of analysis circuit 440 is electrically connected with the output end of storage circuit 420, analysis circuit 440
Second input terminal in2 is electrically connected with 430 first output end out1 of counting circuit, the first output end and the filter of analysis circuit 440
200 second input terminal in2 of wave circuit is electrically connected.
Trigger circuit 410 sends out acoustical signal for triggering sound-conducting apparatus 300, and triggers counting circuit 430 and storage simultaneously
Circuit 420.Trigger circuit 410 triggers sound-conducting apparatus 300 and accesses electric signal, which is converted to acoustical signal and is sent；
Counting circuit 430 and storage circuit 420 are triggered simultaneously, and counting circuit 430 and storage circuit 420 after the power is turned on, start simultaneously beam worker
Make.
Counting circuit 430 is used to calculate the transaudient characteristic of duct of active user.Counting circuit 430 receives sound-conducting apparatus
300 input electrical signal and noise detection apparatus 100 detect the electric signal for the acoustical signal that sound-conducting apparatus 300 is sent out, according to
The electric signal that the input electrical signal and noise-monitoring equipment of above-mentioned sound-conducting apparatus detect, calculates and exports the duct of active user
Transaudient characteristic model data are to analysis circuit.
Storage circuit 420 is for storing the transaudient performance data of a variety of ducts and corresponding filtering parameter.420 quilt of storage circuit
After triggering, by the data transmission of storage to analysis circuit 440.Preferably, it to save the memory space of analysis circuit 440, stores
Circuit 420 can be a group by a group to 440 transmission data of analysis circuit.
Analysis circuit 440 is used to analyze the correction wave filter parameter suitable for the transaudient characteristic of the duct of active user.Root
According to the transaudient characteristic model data of the duct of the active user from counting circuit 430 and the model library from storage circuit 420
With filter bank data, it can be deduced that correction wave filter parameter, and the filter parameter is exported to filter circuit 200.It is preferred that
Ground, the transaudient characteristic model data of duct of the analysis circuit 440 based on active user and the mould for working as previous group from storage circuit 420
Type data and corresponding filter data, analysis obtains result of calculation and records the analysis result, when each in storage circuit 420
Grouped data has been exported to analysis circuit 440, and the corresponding correction wave filter of optimal result can be selected in all analysis results
Output of the parameter as analysis circuit 440.
The present invention proposes a kind of active denoising method, active noise reduction system and earphone, this method by offline design with
The mode that line amendment is combined realizes the anti-acoustic capability optimization of the transaudient characteristic of duct based on different earphone wearers.With it is existing
The adaptive active denoising method having is compared, and this method on-line calculation is small, and the calculating time is short, and it is long to efficiently solve the calculating time
The big problem of caused phase deviation, and this method is simple, is easy to Project Realization.
Embodiment 3
The present invention also proposes the active noise reduction system in a kind of earphone, including embodiment 2, further includes trigger switch, is used for
Trigger trigger circuit.It can be manual mode or automatic mode that this, which sets out and switches on,.When for manual mode, user is manual
Trigger switch is opened, trigger circuit 410 is started to work, and modification model is started；When for automatic mode, headset detection is to there is wearing
Person is just wearing the earphone and is wearing completion, then automatically turns on trigger switch, and trigger circuit 410 is started to work, and modification model is started.
Earphone with the active noise reduction system proposed in embodiment 2 can be filtered according to the transaudient characteristic online modification of duct of user
Device parameter has good adaptivity to the transaudient characteristic of the duct of user, and than the active noise reduction ear using adaptive algorithm
Machine calculation amount is small, and calculating is often short, can ensure good anti-acoustic capability.
Obviously, it is apparent to those skilled in the art that, each step of above-mentioned design method, which can be used, leads to
Computing device realizes that they can be concentrated on a single computing device, or be distributed in multiple computing device institutes group
At network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are deposited
Storage be performed by computing device in the storage device, either they are fabricated to each integrated circuit modules or by it
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific
Hardware and software combine.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
The technique effect and preceding method embodiment phase of the device that the embodiment of the present invention is provided, realization principle and generation
Together, to briefly describe, device embodiment part does not refer to place, can refer to corresponding contents in preceding method embodiment.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustrative, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
Flow chart and block diagram in attached drawing show the system, method and computer journey of multiple embodiments according to the present invention
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part for a part for one module, section or code of table, the module, section or code includes one or more uses
The executable instruction of the logic function as defined in realization.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, this is depended on the functions involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or action is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
Claims (13)
1. active denoising method, which is characterized in that including：
Obtain the transaudient characteristic model of earphone secondary channel；
According to the transaudient characteristic of the duct of user, processing is modified to pre-set filter, obtains revised filter；
Wherein, the filter is to be generated based on the transaudient characteristic model of the earphone secondary channel.
2. active denoising method according to claim 1, which is characterized in that the transaudient characteristic of the acquisition earphone secondary channel
Model G0, including：
Input data based on earphone secondary channel and output data establish the transaudient characteristic model of earphone secondary channel.
3. active denoising method according to claim 1, which is characterized in that the filter includes feedforward filter, anti-
Present filter and feedforward and any one in feedback complex formula filter.
4. active denoising method according to claim 1, which is characterized in that according to the transaudient characteristic of the duct of user, to pre-
The filter being first arranged is modified processing, obtains revised filter, including：
Determine the transaudient characteristic model of the duct of user and the transaudient characteristic model library of duct；
Calculated using similarity algorithm the user the transaudient characteristic model of duct and the transaudient characteristic model library of the duct in appoint
The similarity of one model obtains the model in the highest transaudient characteristic model library of duct of similarity；
Based on the model, correction wave filter is determined, be based on filter and correction wave filter, obtain revised filter.
5. active denoising method according to claim 4, which is characterized in that the similarity algorithm includes：
It is corresponding to the corresponding frequency response curve of the transaudient characteristic model of the duct of the user and the transaudient characteristic model library of the duct
A curve in frequency response curve race carries out registration process, the curve after being aligned；
Calculate the similarity of the curve after the alignment and the curve in the frequency response curve race.
6. active denoising method according to claim 5, which is characterized in that the transaudient characteristic of the duct to the user
A curve in the corresponding frequency response curve race of the corresponding frequency response curve of model and the transaudient characteristic model library of the duct is aligned
Processing, including：
Determine parameter k so that | | li-k*l | |2It is minimum；
Wherein, the transaudient characteristic model library { G of ducti' in corresponding frequency response curve race, carry out the curve of similarity algorithm processing, l
For the corresponding frequency response curve of the transaudient characteristic model of duct, k is real number.
7. active denoising method according to claim 6, which is characterized in that the similarity is Sn=| | li-k*l | |2；
Wherein, Sn is the similarity of the curve l ' and the curve li in frequency response curve race after alignment.
8. active denoising method according to claim 4, which is characterized in that it is described to be based on the model, it determines and corrects filter
Wave device is based on filter and correction wave filter, obtains revised filter, including：
For the transaudient characteristic model library of the duct, corresponding correction wave filter library is established；
According to the transaudient characteristic model of the duct of the user in the transaudient characteristic model library of the duct corresponding model, determine phase
Correction wave filter in the modification filter bank answered.
9. active noise reduction system, which is characterized in that including：Noise-measuring system, filter circuit, corrects circuit at sound-conducting apparatus；
The noise-measuring system includes：First input end, the first output end and second output terminal；
The filter circuit includes：First input end, the second input terminal and the first output end；
The sound-conducting apparatus includes：First input end, the second input terminal, the first output end and second output terminal；
The amendment circuit includes：First input end, the second input terminal, the first output end and second output terminal；
First output end of the noise-measuring system is electrically connected with the first input end of the filter circuit, and the noise is surveyed
The second output terminal and the first input end for correcting circuit for measuring device are electrically connected；
The first input end of the filter circuit is electrically connected with the first output end of the noise-measuring system, the filter
Second input terminal of wave circuit is electrically connected with first output end for correcting circuit, and described the of the filter circuit
The first input end of one output end and the sound-conducting apparatus is electrically connected；
The first input end of the sound-conducting apparatus and the first output end of the filter circuit are electrically connected, the sound-conducting apparatus
Second input terminal is electrically connected with the second output terminal for correcting circuit, the second output terminal of the sound-conducting apparatus
It is electrically connected with second input terminal for correcting circuit；
The second output terminal of the first input end for correcting circuit and the noise-measuring system is electrically connected, the amendment electricity
Second input terminal on road is electrically connected with the second output terminal of the sound-conducting apparatus, and described the first of the amendment circuit is defeated
Second input terminal of outlet and the filter circuit is electrically connected, the second output terminal for correcting circuit with it is described transaudient
Second input terminal of device is electrically connected；
The noise-measuring system is used for detected noise signal；
The filter circuit, for generating noise cancellation signal；
The sound-conducting apparatus, for converting the electrical signal to acoustical signal；
The amendment circuit, the filter for correcting filter circuit.
10. active noise reduction system according to claim 9, which is characterized in that the filter circuit includes analog-to-digital conversion electricity
Road, filter and D/A converting circuit, the filter are electrical with analog-digital conversion circuit as described, the D/A converting circuit respectively
Connection.
11. active noise reduction system according to claim 10, which is characterized in that the filter is feedforward filter, instead
Present filter and feedforward and any one in feedback complex formula filter.
12. active noise reduction system according to claim 9, which is characterized in that the amendment circuit includes trigger circuit, deposits
Storing up electricity road, counting circuit and analysis circuit；
The trigger circuit includes the first output end, second output terminal and third output end；
The counting circuit includes first input end, the second input terminal, third input terminal and the first output end；
The analysis circuit includes first input end, the second input terminal and the first output end；
First output end of the trigger circuit is connect with the second input terminal of the sound-conducting apparatus, the trigger circuit it is described
The input terminal of second output terminal and the storage circuit is electrically connected, the third output end and the meter of the trigger circuit
The first input end for calculating circuit is electrically connected；
Three output ends of the first input end of the counting circuit and the trigger circuit the are electrically connected, the counting circuit
The second output terminal of second input terminal and the noise-measuring system is electrically connected, and the third of the counting circuit is defeated
Enter end and the second output terminal of the sound-conducting apparatus is electrically connected；
The input terminal of the storage circuit and the second output terminal of the trigger circuit are electrically connected, the output of the storage circuit
End and the first input end of the analysis circuit are electrically connected；
The output end of the first input end of the analysis circuit and the storage circuit is electrically connected, the analysis circuit it is described
First output end of the second input terminal and the counting circuit is electrically connected, first output end of the analysis circuit and institute
The second input terminal for stating filter circuit is electrically connected；
The trigger circuit sends out acoustical signal for triggering the sound-conducting apparatus, and trigger simultaneously the counting circuit with it is described
Storage circuit；
The counting circuit, the transaudient characteristic of duct for calculating active user；
The storage circuit, for storing the transaudient performance data of a variety of ducts and corresponding filter parameter data；
The analysis circuit, for analyzing the filter parameter for being suitable for the transaudient characteristic of duct of active user.
13. earphone, including claim 9 is to the active noise reduction system of any one of claim 12, which is characterized in that including
Trigger switch, for triggering trigger circuit.
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