CN207068462U - Active noise control system in a kind of car hold - Google Patents
Active noise control system in a kind of car hold Download PDFInfo
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- CN207068462U CN207068462U CN201720763702.4U CN201720763702U CN207068462U CN 207068462 U CN207068462 U CN 207068462U CN 201720763702 U CN201720763702 U CN 201720763702U CN 207068462 U CN207068462 U CN 207068462U
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Abstract
Active noise control system in a kind of car hold disclosed in the utility model, the system include：Multiple reference noise sensors, multiple error microphones, active noise reduction controller and loudspeaker.Compared with prior art, Active noise control system can realize the wideband noise reduction to car interior noise in cabin disclosed in the utility model, and noise reduction is more obvious.
Description
Technical field
It the utility model is related to Active noise control system in automobile technical field, more particularly to a kind of car hold.
Background technology
With developing rapidly for modern industry, communications and transportation and aviation industry, car ownership also more and more higher.And with
Raising, the reinforcement of environmental consciousness and the development of auto industry that people are required vehicle ride comfort, the noise of automobile
Control is increasingly subject to the attention of people.
At present, the control of automobile interior noise is mainly based on passive control.The passive control of automobile interior noise is main
It is structure design by optimizing automobile and carries out physics noise reduction using sound-absorbing material on automobile, realizes automobile interior noise
Control.The passive control of this automobile interior noise is obvious for the shield effectiveness of high band noise, but is made an uproar for middle low frequency
The control effect of sound then unobvious.
With the development of automobile noise reduction technology, the active control of automobile interior noise also increasingly receives the favor of people.
The principle of the active control of automobile interior noise is：All sound is all made up of certain frequency spectrum, can find a kind of sound,
Its frequency spectrum and the automobile interior noise to be eliminated are just the same, and simply phase is just opposite (180 ° of difference), it is possible to by vapour
Car interior noise is completely counterbalanced by.Its key problem in technology is how to obtain that sound for offsetting noise.
Now, although the active control of automobile interior noise has obtained certain research and application, current automobile
The active control technology of interior noise is not mature enough, and Noise measarement effect is also not ideal enough.
Utility model content
The utility model purpose is to provide a kind of active control system of automobile interior noise, to solve the above problems.
The utility model solves technical problem and adopted the following technical scheme that：
Active noise control system in a kind of car hold, including：
Multiple reference noise sensors, the multiple reference noise sensor are arranged in automobile noise pickup area, are used
In collection main noise source noise x [n]；
Multiple error microphones, the multiple error microphone is arranged in the automobile noise control region, for gathering vapour
Residual noise e [n] in cabin after Noise measarement；
Active noise reduction controller, the active noise reduction controller respectively with the reference noise sensor and error microphone
It is connected, for receiving main noise source noise x [n] and residual noise e [n], and it is a series of according to main noise source noise x [n] extractions
Incoherent reference acoustic mode S [n], further according to a series of incoherent raw with reference to acoustic mode S [n] and residual noise e [n]
Into optimal noise control mode；
Loudspeaker, the loudspeaker are arranged in car hold, and are connected with the active noise reduction controller, for receiving most
Excellent noise control mode, and echo signal Y [n] is sent to reduce automobile interior noise according to optimal noise control mode.
It can be seen that Active noise control system in cabin disclosed in the utility model, by default main noise source and is gathered
Main noise source noise x [n] in automobile noise pickup area, gather the residual noise e [n] after Noise measarement, root in car hold
It is a series of incoherent with reference to acoustic mode S [n] according to main noise source noise x [n] extractions, further according to a series of incoherent references
Acoustic mode S [n] and residual noise e [n] generates optimal noise control mode.Compared with prior art, the utility model institute
Active noise control system incoherent optimal is made an uproar by a series of with reference to what acoustic mode S [n] were obtained in disclosed cabin
The degree of accuracy of acoustic control pattern is higher, can more match with the noise pattern in cabin, further according to optimal noise control mode
Echo signal Y [n] is sent, by the echo signal Y sent thus according to the optimal noise control mode with more high accuracy
[n], then echo signal Y [n] and car interior noise matching degree are also higher, so as to realize the wideband noise reduction to car interior noise
Effect, noise reduction are more obvious.
Brief description of the drawings
Fig. 1 is Active noise control system structural representation in a kind of cabin disclosed in the utility model；
Fig. 2 is Active noise control system structural representation in another cabin disclosed in the utility model；
Noise profile in cabin before and after Fig. 3 opens for Active noise control system in cabin disclosed in the utility model
Figure.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
The technical solution of the utility model is further elaborated with reference to embodiment and accompanying drawing.
Embodiment one
Originally implement and disclose noise initiative control method in a kind of cabin, including：
Default main noise source simultaneously gathers the main noise source noise x [n] in automobile noise pickup area.In vehicle traveling process
In, the noise source in car hold is mainly that engine noise, road are made an uproar the noise sent with audio frequency apparatus in car hold.So
In the present embodiment, the middle low frequency range noise and difference engine compartment noise under different rotating speeds, vehicle-mounted voice band device radiated
Road under road conditions, which is made an uproar, is preset as main noise source.Then the automobile noise pickup area includes：Automobile engine nacelle, automobile cabin
And automobile chassis.Main noise source noise x [n] then includes：Automobile engine noise xaThe radiated noise x of [n], vehicle-mounted voice band deviceb
The vibration signal x on [n] and chassisc[n].Wherein, automobile engine noise x is gathered in automobile engine nacellea[n], drives in automobile
Sail the radiated noise x of cabin collection vehicle-mounted voice band deviceb[n], the vibration signal x on chassis is gathered on automobile chassisc[n] is (i.e. different
Make an uproar on road under road conditions).In the present embodiment, the main noise source noise x [n] is：
X [n]=xa[n]+xb[n]+xc[n].Wherein, main noise source noise x [n] is n discrete time to main noise source
The formed matrix of sampling.The acoustic properties of main noise source include amplitude, phase and frequency.
Gather the residual noise e [n] after Noise measarement in car hold.Residual noise e [n] is n discrete time to remnants
The matrix that noise samples are formed.Residual noise e [n] is actually remaining after Noise measarement in car hold makes an uproar
Sound, it is understood that for the noise that people can experience in car hold.
Main noise source noise x [n] and residual noise e [n] is received, and it is a series of not according to main noise source noise x [n] extractions
Relevant reference acoustic mode S [n], further according to a series of incoherent with reference to acoustic mode S [n] and residual noise e [n] generations
Optimal noise control mode.
Wherein, it is described according to a series of incoherent mistakes with reference to acoustic mode S [n] of main noise source noise x [n] extractions
Journey, including：
It is S11, a series of with reference to acoustic mode S'[n according to main noise source noise x [n] extractions].The process includes again：It will carry
Take function E-1It is applied in main noise source noise x [n]：S'[n]=E-1(x[n]).Wherein, function E is extracted-1It is that there is memory work(
Can linear mapping function, perform convolution algorithm, the acoustic mode mainly includes three key elements of noise signal, i.e., amplitude,
Phase and frequency information.Main noise source noise x [n] matrix elements and a series of with reference to acoustic mode S'[n] between matrix element
For mapping relations.
S12, acoustic mode S'[n will be referred to] between mutual information be adjusted to minimum, obtain a series of incoherent references
Acoustic mode S [n].The process includes again：Contrast function D is acted on a series of with reference to acoustic mode S'[n] in：
D (S'[n])=I [S'[1] ... S'[k]],
Use adjust automatically algorithm adjust automatically extraction function E-1, a series of with reference to acoustic mode S'[n] between it is mutual
Information I [S'[1] ... S'[k]] it is minimum when, the acoustic mode that is exported is a series of incoherent with reference to acoustic mode S [n].Its
In, extract function E using adjust automatically algorithm adjust automatically-1Process it is as follows：
(1) if I ＞ 0, adjust E-1, change x [n] and S'[n] between mapping relations, continue to judge；
(2) if I=0, E is used-1Extraction function as extraction process.It is described a series of incoherent to refer to acoustic mode
Formula S [n] is the separated most representational acoustic mode out from default main noise source.Disclosed in the present embodiment
Method is applied to function is extracted in multiple reference signals input of polymorphic type sound source, and is extracted by Adaptive adjusting algorithm
The optimization of function, it can effectively ensure the degree of accuracy of extracted acoustic mode.
It is described according to residual noise e [n] and a series of incoherent to generate optimal noise control with reference to acoustic mode S [n]
The process of molding formula, including：
Echo signal is analyzed from the path transfer function H [n] being issued at residual noise collection, and obtain for noise
The path transfer function H [n] of the prediction of control model.The process can be understood as time span corresponding to n sampled point as one
The individual period, ML biography is formed if system includes M loudspeaker and L error microphone, between loudspeaker and error microphone
Path is passed, now, analyzes whether j-th of path transfer function H [j] causes residual noise e (n) to be restrained in n sampling number：
(1) if convergence, the prediction of noise control mode is carried out using H [j]；(2) if not restraining, H [j] analysis is abandoned, is repeated
Above step is analyzed H [j+1]；
Based on FX-LMS algorithms, by adjusting filter weight coefficient formulas w [n+1]=w [n]+μ e [n] H
H [n] and μ in [n] S [n] constantly update weight coefficient w until during convergence factor μ minimums during residual noise e (n) convergences,
Export a kind of optimal noise control mode Y [n]=wS [n].
The optimal noise control mode Y [n] can most match with a series of incoherent reference acoustic mode S [n],
I.e. amplitude is identical with frequency and the pattern of opposite in phase, could effectively be offseted with this with main noise source noise, reaches optimal
Noise reduction.
Finally, then optimal noise control mode is received, and echo signal Y is sent according to optimal noise control mode
[n] is to reduce automobile interior noise.Because optimal noise control mode Y [n] most incoherent can refer to acoustics with a series of
Mode S [n] matches, then the echo signal (sound) sent according to optimal noise control mode could effectively offset master
Noises from noise sources, reach optimal noise reduction.
It can be seen that noise initiative control method in cabin disclosed in the present embodiment, by default main noise source and gathers vapour
Main noise source noise x [n] in car Noise Acquisition region, the residual noise e [n] after Noise measarement in car hold is gathered, according to
Main noise source noise x [n] extractions are a series of incoherent with reference to acoustic mode S [n], and incoherent sound is referred to further according to a series of
Learn Mode S [n] and residual noise e [n] generates optimal noise control mode.Compared with prior art, disclosed in the present embodiment
Cabin in noise initiative control method pass through it is a series of incoherent with reference to acoustic mode S [n] the optimal noise controls that are obtained
The degree of accuracy of molding formula is higher, can more match with the noise pattern in cabin, be sent further according to optimal noise control mode
Echo signal Y [n], by the echo signal Y [n] sent thus according to the optimal noise control mode with more high accuracy, then
Echo signal Y [n] and car interior noise matching degree are also higher, so as to realize the wideband noise reduction to car interior noise,
Noise reduction is more obvious.
In addition, reference acoustic mode and remnants of the present embodiment according to multiple reference signals in default multiple main noise sources
Noise, adaptive optimization filter weight coefficient, to export the optimal Noise measarement mould high with referring to acoustic mode matching degree
Formula, target acoustic signal corresponding with the optimal noise control mode is sent further according to the optimal noise control mode, in vapour
Noise reduction to greatest extent is realized in cabin.
Further, the present embodiment by acceleration transducer and part microphone be respectively arranged on automobile chassis, start
In cabin and in automobile cabin, the acoustic feedback problem in car hold can be greatly lowered.And the side disclosed in the present embodiment
Method makes an uproar the road under the engine compartment noise under different rotating speeds, the middle low frequency range noise of vehicle-mounted voice band device radiation, different road conditions
Etc. main noise source set is set as, by implementing active denoising method of the present utility model, by different road conditions and drive speed
In caused driving cabin in the case of noise profile change, wideband noise reduction can be still realized, does not limit vehicle, it is pervasive to compare
It is stronger.
Embodiment two
Present embodiment discloses Active noise control system in a kind of car hold, as depicted in figs. 1 and 2, including：
Multiple reference noise sensors, the multiple reference noise sensor are arranged in automobile noise pickup area, are used
In collection main noise source noise x [n]；
Multiple error microphones, the multiple error microphone is arranged in the automobile noise control region, for gathering vapour
Residual noise e [n] in cabin after Noise measarement；
Active noise reduction controller, the active noise reduction controller respectively with the reference noise sensor and error microphone
It is connected, for receiving main noise source noise x [n] and residual noise e [n], and it is a series of according to main noise source noise x [n] extractions
Incoherent reference acoustic mode S [n], further according to a series of incoherent raw with reference to acoustic mode S [n] and residual noise e [n]
Into optimal noise control mode；
Loudspeaker, the loudspeaker are arranged in car hold, and are connected with the active noise reduction controller, for receiving most
Excellent noise control mode, and echo signal Y [n] is sent to reduce automobile interior noise according to optimal noise control mode.
Wherein, the automobile noise pickup area includes the chassis of automobile engine nacelle, automobile cabin and automobile.And institute
Reference noise sensor is stated, including：
First refers to microphone, and described first is arranged in automobile engine nacelle with reference to microphone, for gathering automobile hair
Motivation noise xa[n], in the present embodiment, the reference noise sensor refer to microphone including 4 are arranged symmetrically first；
Second refers to microphone, and described second is arranged in automobile cabin with reference to microphone, for gathering onboard audio
The radiated noise x of deviceb[n], in the present embodiment, the reference noise sensor are arranged symmetrically in car hold including 8
The second of top refers to microphone；
Acceleration transducer, the acceleration transducer are arranged on the chassis of automobile, and the vibrations for gathering chassis are believed
Number xc[n], in the present embodiment, the reference noise sensor are symmetricly set on automobile chassis and vehicle body tie point including 12
The acceleration transducer at place.
Active noise control system is symmetrical arranged including the individual seats in car hold of 2M at human ear in the car hold
Error microphone, wherein, M be car hold in seat number.
The active noise reduction controller, including：
With reference to acoustic mode extraction unit, the acoustic mode extraction unit is connected with the reference noise sensor, uses
In reception main noise source noise x [n], and it is a series of incoherent with reference to acoustic mode S according to main noise source noise x [n] extractions
[n].It is described to include again with reference to acoustic mode extraction unit：Subelement is extracted with reference to acoustic mode, it is described to be carried with reference to acoustic mode
Take subelement to be used to receive main noise Sound source noise x [n], and acoustic mode is referred to according to main noise source noise x [n] extractions are a series of
Formula S'[n]；Subelement is separated with reference to acoustic mode, it is described to be carried with reference to acoustic mode separation subelement with described with reference to acoustic mode
It is take subelement, a series of with reference to acoustic mode S'[n for receiving], and will refer to acoustic mode S'[n] between mutual information tune
It is whole a series of incoherent with reference to acoustic mode S [n] to minimum, acquisition；
Noise control mode predicting unit, the noise control mode predicting unit respectively with the error microphone and ginseng
Acoustic mode separative element is examined to be connected, for receiving residual noise e [n] and a series of incoherent reference acoustic mode S [n],
And according to residual noise e [n] and a series of incoherent noise control modes optimal with reference to acoustic mode S [n] generations.It is described
Noise control mode predicting unit includes again：Path transfer function analyzes subelement, and the path transfer function analyzes subelement
For analyzing path transfer function of the echo signal from loudspeaker to error microphone, and obtain for the pre- of noise control mode
The path transfer function H [n] of survey；Sef-adapting filter, the sef-adapting filter are analyzed with the path transfer function respectively
Subelement, error microphone are connected with reference to acoustic mode extraction unit, for receiving the prediction for noise control mode
Path transfer function H [n], residual noise e [n] and a series of incoherent reference acoustic mode S [n], and calculated based on FX-LMS
Method, by adjusting H [n] and μ in filter weight coefficient formulas w [n+1]=w [n]+μ e [n] H [n] S [n]
To constantly update weight coefficient w, until during convergence factor μ minimums during residual noise e (n) convergences, a kind of optimal noise is exported
Control model Y [n]=wS [n].
In the present embodiment, the acoustic mode extraction unit receives main noise source noise x [n] (x [n]=xa[n]+xb
[n]+xc[n]), and it is a series of incoherent with reference to acoustic mode S [n] according to main noise source noise x [n] extractions.Specifically, institute
State and one system is extracted according to main noise source noise x [n] with reference to the reference acoustic mode extraction subelement in acoustic mode extraction unit
Row refer to acoustic mode S'[n].The process includes again：Will extraction function E-1It is applied in main noise source noise x [n]：S'[n]=
E-1(x[n]).Wherein, function E is extracted-1It is the linear mapping function with memory function, performs convolution algorithm, the acoustic mode
Formula mainly includes three key elements of noise signal, i.e. amplitude, phase and frequency information.Main noise source noise x [n] matrix elements with
It is a series of with reference to acoustic mode S'[n] be mapping relations between matrix element.Sound will be referred to reference to acoustic mode separation subelement
Learn Mode S ' the mutual information between [n] is adjusted to minimum, obtain a series of incoherent with reference to acoustic mode S [n].The process is again
Including：Contrast function D is acted on a series of with reference to acoustic mode S'[n] in：D (S'[n])=I [S'[1] ... S'[k]], make
With adjust automatically algorithm adjust automatically extraction function E-1, a series of with reference to acoustic mode S'[n] between mutual information I [S'
[1] ... S'[k]] it is minimum when, the acoustic mode that is exported is a series of incoherent with reference to acoustic mode S [n].Wherein, use
Adjust automatically algorithm adjust automatically extraction function E-1Process it is as follows：
(1) if I ＞ 0, adjust E-1, change x [n] and S'[n] between mapping relations, continue to judge；
(2) if I=0, E is used-1Extraction function as extraction process.It is described a series of incoherent to refer to acoustic mode
Formula S [n] is the separated most representational acoustic mode out from default main noise source.Disclosed in the present embodiment
Method is applied to function is extracted in multiple reference signals input of polymorphic type sound source, and is extracted by Adaptive adjusting algorithm
The optimization of function, it can effectively ensure the degree of accuracy of extracted acoustic mode.
Path transfer function analysis subelement in the noise control mode predicting unit analyzes echo signal from raising one's voice
Device is issued to the path transfer function of error microphone, and obtains the path transfer function H of the prediction for noise control mode
[n], it is a period that the process, which can be understood as time span corresponding to n sampled point, if system includes M loudspeaker and L
Individual error microphone, then ML bang path is formed between loudspeaker and error microphone, now, analyze j-th of path and transmit
Whether function H [j] causes residual noise e (n) to be restrained in n sampling number：(1) if convergence, noise is carried out using H [j]
The prediction of control model；(2) if not restraining, H [j] analysis is abandoned, above step is repeated and H [j+1] is analyzed；
Sef-adapting filter in the noise control mode predicting unit is based on FX-LMS algorithms, by adjusting wave filter
H [n] and μ in weight coefficient calculation formula w [n+1]=w [n]+μ e [n] H [n] S [n] constantly update weight coefficient w
Until during convergence factor μ minimums during residual noise e (n) convergences, a kind of optimal noise control mode Y [n]=wS is exported
[n]。
The optimal noise control mode Y [n] can most match with a series of incoherent reference acoustic mode S [n],
I.e. amplitude is identical with frequency and the pattern of opposite in phase, could effectively be offseted with this with main noise source noise, reaches optimal
Noise reduction.
From in the present embodiment, Active noise control system includes being separately positioned on 4 car doors of automobile in the car hold
And 4 loudspeakers of face automotive seat.The loudspeaker receives optimal noise control mode, and according to optimal noise control
Molding formula sends echo signal Y [n] to reduce automobile interior noise.Because optimal noise control mode Y [n] most can be with a system
Arrange incoherent reference acoustic mode S [n] to match, then echo signal (the sound sent according to optimal noise control mode
Sound) main noise source noise could be effectively offset, reach optimal noise reduction.
It can be seen that Active noise control system in cabin disclosed in the present embodiment, logical to include：Multiple reference noise sensings
Device, multiple error microphones, active noise reduction controller and loudspeaker.Wherein, reference noise sensor is used to gather main noise source
Noise x [n]；Error microphone is used to gather the residual noise e [n] in car hold after Noise measarement；Active noise reduction controller is used
In reception main noise source noise x [n] and residual noise e [n], and it is a series of incoherent according to main noise source noise x [n] extractions
With reference to acoustic mode S [n], further according to a series of incoherent optimal with reference to acoustic mode S [n] and residual noise e [n] generations
Noise control mode；Loudspeaker is used to receive optimal noise control mode, and sends mesh according to optimal noise control mode
Signal Y [n] is marked to reduce automobile interior noise.Compared with prior art, the car interior noise disclosed in the present embodiment is actively controlled
System processed is higher by a series of degree of accuracy of incoherent optimal noise control modes obtained with reference to acoustic mode S [n],
It can more match with the noise pattern in cabin, echo signal Y [n] be sent further according to optimal noise control mode, due to being
The echo signal Y [n] sent according to the optimal noise control mode with more high accuracy, then in echo signal Y [n] and cabin
The matching degree of noise is also higher, and so as to realize the wideband noise reduction to car interior noise, noise reduction is more obvious.
In addition, reference acoustic mode and remnants of the present embodiment according to multiple reference signals in default multiple main noise sources
Noise, adaptive optimization filter weight coefficient, to export the optimal Noise measarement mould high with referring to acoustic mode matching degree
Formula, target acoustic signal corresponding with the optimal noise control mode is sent further according to the optimal noise control mode, in vapour
Noise reduction to greatest extent is realized in cabin.
Further, the present embodiment by acceleration transducer and part microphone be respectively arranged on automobile chassis, start
In cabin and in automobile cabin, the acoustic feedback problem in car hold can be greatly lowered.And the side disclosed in the present embodiment
Method makes an uproar the road under the engine compartment noise under different rotating speeds, the middle low frequency range noise of vehicle-mounted voice band device radiation, different road conditions
Etc. main noise source set is set as, by implementing active denoising method of the present utility model, by different road conditions and drive speed
In caused driving cabin in the case of noise profile change, wideband noise reduction can be still realized, does not limit vehicle, it is pervasive to compare
It is stronger.
As shown in figure 3, the present embodiment is further disclosed under certain speed, noise impedance in this car hold is opened
Before system and the noise spectrum after Active noise control system, measured in this car hold in car hold is opened, can by contrast
Know, active noise reduction significant effect of the active noise reduction scheme provided by the utility model in wide frequency range.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the utility model technology
The spirit and scope of scheme.
Claims (9)
- A kind of 1. Active noise control system in car hold, it is characterised in that including：Multiple reference noise sensors, the multiple reference noise sensor is arranged in automobile noise pickup area, for adopting Collect main noise source noise x [n]；Multiple error microphones, the multiple error microphone is arranged in the automobile noise control region, for gathering car hold Residual noise e [n] after interior Noise measarement；Active noise reduction controller, the active noise reduction controller respectively with the reference noise sensor and error microphone phase Even, for receiving main noise source noise x [n] and residual noise e [n], and it is a series of not according to main noise source noise x [n] extractions Relevant reference acoustic mode S [n], further according to a series of incoherent with reference to acoustic mode S [n] and residual noise e [n] generations Optimal noise control mode, wherein, the active noise reduction controller, including：With reference to acoustic mode extraction unit, the acoustics Schema extraction unit is connected with the reference noise sensor, for receiving main noise source noise x [n], and according to main noise source Noise x [n] extractions are a series of incoherent with reference to acoustic mode S [n]；Noise control mode predicting unit, the Noise measarement Model prediction unit is connected with the error microphone and with reference to acoustic mode separative element respectively, for receiving residual noise e It is [n] and a series of incoherent with reference to acoustic mode S [n], and according to residual noise e [n] and a series of incoherent refer to sound Learn Mode S [n] and generate optimal noise control mode；Loudspeaker, the loudspeaker are arranged in car hold, and are connected with the active noise reduction controller, optimal for receiving Noise control mode, and echo signal Y [n] is sent to reduce automobile interior noise according to optimal noise control mode.
- 2. Active noise control system in car hold according to claim 1, it is characterised in that the reference noise sensing Device, including：First refers to microphone, and described first is arranged in automobile engine nacelle with reference to microphone, for gathering automobile engine Noise xa[n]；Second refers to microphone, and described second is arranged in automobile cabin with reference to microphone, for gathering vehicle-mounted voice band device Radiated noise xb[n]；Acceleration transducer, the acceleration transducer are arranged on the chassis of automobile, for gathering the vibration signal x on chassisc [n]。
- 3. Active noise control system in car hold according to claim 2, it is characterised in that the reference noise sensor Microphone is referred to including 4 are arranged symmetrically first.
- 4. Active noise control system in car hold according to claim 2, it is characterised in that the reference noise sensor The second of car hold inner top, which is arranged symmetrically in, including 8 refers to microphone.
- 5. Active noise control system in car hold according to claim 2, it is characterised in that the reference noise sensor Including 12 acceleration transducers being symmetricly set at automobile chassis and vehicle body tie point.
- 6. Active noise control system in car hold according to claim 1, it is characterised in that the automobile interior noise master Autocontrol system includes 2M seat symmetrically arranged error microphones at human ear in car hold, wherein, M is car hold Interior seat number.
- 7. Active noise control system in car hold according to claim 1, it is characterised in that described to be carried with reference to acoustic mode Unit is taken, including：Subelement is extracted with reference to acoustic mode, it is described to be used to receive main noise Sound source noise x with reference to acoustic mode extraction subelement [n], and a series of with reference to acoustic mode S'[n according to main noise source noise x [n] extractions]；Subelement is separated with reference to acoustic mode, it is described with reference to acoustic mode separation subelement and reference acoustic mode extraction It is unit, a series of with reference to acoustic mode S'[n for receiving], and acoustic mode S'[n will be referred to] between mutual information be adjusted to Minimum, obtain a series of incoherent with reference to acoustic mode S [n].
- 8. Active noise control system in car hold according to claim 1, it is characterised in that the noise control mode is pre- Unit is surveyed, including：Path transfer function analyzes subelement, and the path transfer function analysis subelement is used to analyze echo signal from loudspeaker To the path transfer function of error microphone, and obtain the path transfer function H [n] of the prediction for noise control mode；Sef-adapting filter, the sef-adapting filter analyze subelement, error microphone with the path transfer function respectively Be connected with reference to acoustic mode extraction unit, for receive the prediction for noise control mode path transfer function H [n], Residual noise e [n] and a series of incoherent reference acoustic mode S [n], and FX-LMS algorithms are based on, by adjusting wave filter H [n] and μ in weight coefficient calculation formula w [n+1]=w [n]+μ e [n] H [n] S [n] constantly update weight coefficient w, Until during convergence factor μ minimums during residual noise e (n) convergences, a kind of optimal noise control mode Y [n]=wS is exported [n]。
- 9. Active noise control system in car hold according to claim 1, it is characterised in that the automobile interior noise master Autocontrol system includes being separately positioned on 4 car doors of automobile and 4 loudspeakers of face automotive seat.
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| CN107424596A (en) * | 2017-06-28 | 2017-12-01 | 邢优胜 | Noise initiative control method and system in a kind of car hold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107424596A (en) * | 2017-06-28 | 2017-12-01 | 邢优胜 | Noise initiative control method and system in a kind of car hold |
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