CN107086034A - A kind of vehicle-mounted active noise reduction system and method - Google Patents
A kind of vehicle-mounted active noise reduction system and method Download PDFInfo
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- CN107086034A CN107086034A CN201610967849.5A CN201610967849A CN107086034A CN 107086034 A CN107086034 A CN 107086034A CN 201610967849 A CN201610967849 A CN 201610967849A CN 107086034 A CN107086034 A CN 107086034A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/128—Vehicles
- G10K2210/1282—Automobiles
- G10K2210/12821—Rolling noise; Wind and body noise
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
A kind of vehicle-mounted active noise reduction system, the present invention directly can be judged the noise frequency that Mike receives by algorithm chip and circuit, find region sound field, so as to send anti-phase sound wave, offset noise, car engine rotary speed information need not be inputted, noise is directly received by Mike, the sound after noise reduction need not be exported by inputting car engine rotating speed, to wind, tire, engine, vibrations, the noise that interior trim is sent has good noise reduction, electric car can also be used, noise reduction system calculates all noise sound fields by microphone array independent of engine data in real time, to engine, wind is made an uproar, tire make an uproar vibrations noise have good effect, it is more practical in electric car scene, also without by being adapted to vehicle rotating speed, plug and play.
Description
Technical field
The present invention relates to automotive field, more particularly to a kind of vehicle-mounted active noise reduction system and method.
Background technology
Noise reduction system main at present is earphone-type active noise reduction system, and its scope is one-dimensional, single-point.Principle is logical
Cross Mike's input noise, loudspeaker to export the process of one-dimensional plane noise reduction sound wave to realize noise reduction, process is fairly simple, earphone with
Human ear is closer to the distance, and the noise reduction sound wave sent reaches noise reduction target point and will not changed, but is not suitable for the space in region, ear
Machine shows with loudspeaker no longer the same area, not interfereing with each other, noise reduction noise does not interfere with microphone input, will not produce interference
It is region, the space of multidimensional to have its scope being directed to of automobile active noise reduction system, and principle is then by Mike and car engine
Rotating speed input, the output of driving automobile audio and the anti-phase noise reduction sound wave of noise, and noise realizes noise reduction, mistake in space overlapping
Journey is more complicated than earphone, because automobile scene needs region noise reduction so need to be carried out to overall sound field rather than single locus sound
Calculating is handled, if but existing automobile ANC system can not gather information realization overall sound field meter in real time by doing microphone
Calculate, so being made an uproar for wind, tire is made an uproar, shaking noise, all foundation single-point acoustic informations estimate that DeGrain is made an uproar for engine
Sound, system needs the rotary speed information of additional input engine, and to aid in computing engines noise sound-filed simulation, system is directed to specific vehicle
Preliminary experiment measures and records the acoustic field state in the case of different engine speeds, under actual vehicle behavior by way of difference
To estimate the engine noise sound-filed simulation of current state, the system substantially, is made an uproar, tire is made an uproar, shaken to engine noise noise reduction to wind
Other noise noise reductions such as moving noise are not obvious, while the system needs and the real-time rotating speed of automobile computer communication acquisition is defeated
Enter, deployment difficulty is high, only support automobile vendor's prepackage, it is necessary to targetedly carry out preliminary experiment to every kind of vehicle, measurement record is not
With the engine noise sound field information of rotating speed, suitability is poor.
The content of the invention
The present invention is intended to provide a kind of vehicle-mounted active noise reduction system and method.
To realize above-mentioned technical purpose, the present invention uses following technical scheme, a kind of vehicle-mounted active noise reduction system, the system
Including power-supply system, input module, output module and computing module, input module connection computing module, computing module connection is defeated
Go out module, input module is specifically noise information input module, and computing module includes DSP chips, and output module includes DAC moulds
Block, class-D amplifier and loudspeaker, noise information input module include microphone array and ADC, microphone array connection
ADC, microphone array includes microphone, pre-amplifying module and the audio-frequency amplifier of acquisition noise information, multigroup Mike
The noise information collected is delivered to ADC and will simulated by wind array after pre-amplifying module and audio-frequency amplifier amplification to be believed
Number be converted to data signal, above-mentioned audio-frequency amplifier, ADC, dsp chip, DAC module and class-D amplifier respectively with ARM most
Mini system is connected, and audio-frequency amplifier can be with the amplification of accurate control signal by the connection with ARM minimum systems with class-D amplifier
State modulator, noise information is delivered to the multi-channel noise information gathered after ADC by ARM minimum systems to microphone array
The corresponding signal all the way in each microphone array monitoring point is carried out pre-processing, first carried out after digital-to-analogue conversion is entered
Data slicer, i.e. temporally uniform cutting collection signal, and ensure that every section of timeslice has 50% overlapping portion, then to each
The data of timeslice carry out FFT Fourier transforms, each timeslice is obtained the frequency domain function of class frequency distribution, then to institute
The frequency domain function for having timeslice does the statistics acoustic pressure data array that mean value computation obtains microphone array correspondence monitoring point, input
The sound pressure signal frequency domain data array of monitoring point is delivered to the dsp chip of computing module by module, and dsp chip is loaded with ARM
The algorithm of the calculating noise sound field of minimum system, by determining one group of base come the noise sound field for describing region, base is basis
The different coordinate systems of scene describe sound field, there are a coefficient arrays between sound field and this group of base, and in order to calculate this
Group coefficient arrays, the variance introduced between error descriptive equation, i.e. sound pressure signal frequency domain data array and sound field calculated value,
In the case that variance is minimum, reversely solves equation and can obtain corresponding sound field coefficient arrays, so as to calculate noise sound field, simultaneously
Computing module calculates overall control sound field according to the number of output module and the mapping function of loudspeaker, and control sound field is to raise one's voice
The sound field superposition of device array, by controlling after electric signal drive the speaker sounding, measurement sound divides the mapping function of loudspeaker in advance
Cloth data can just be measured in advance, after then introducing noise reduction sound field descriptive equation, i.e. noise sound field is superimposed with control sound field
Noise reduction result sound field, in the case where the mapping function of noise sound field and control sound field is determined, then determines the noise reduction knot of minimum
Fruit sound field, most suitable loudspeaker array of electrical signals can be drawn by reversely solving equation, and dsp chip is by described loudspeaker electric signal
Array is sent to output module, is loaded again by class-D amplifier by ARM minimum systems after being converted to analog signal through DAC module
Amplifying parameters amplification after be delivered to loudspeaker and send anti-phase noise reduction acoustic wave form and complete noise reduction, now noise into Noise measarement sound field
MIM message input module can measure the result of noise reduction and judge whether noise reduction is up to standard, carry out error feedback, counted if not up to standard
New noise sound field and the above-mentioned noise reduction process of repetition.
A kind of vehicle-mounted active denoising method, this method comprises the following steps：
S1, microphone array acquisition noise information, microphone is by the ambient noise information collected through pre-amplifying module and audio
Be delivered to ADC after amplifier amplification and convert analog signals into data signal, ARM minimum systems connect audio-frequency amplifier with
Control amplification coefficient；
S2, multi-channel noise information pre-processing, the noise information that step S1 is obtained are delivered to after ADC by ARM minimum systems
Signal all the way corresponding to each microphone array monitoring point carries out pre-processing, the advanced line number after digital-to-analogue conversion was entered
According to section, i.e. temporally uniform cutting collection signal, and ensure that every section of timeslice has overlapping portion, then to each timeslice
Data carry out FFT Fourier transforms, each timeslice is obtained the frequency domain function of class frequency distribution, then to all timeslices
Frequency domain function do mean value computation obtain microphone array correspondence monitoring point statistics acoustic pressure data array, finally by monitoring point
Sound pressure signal frequency domain data array be delivered to dsp chip；
S3, operation sound field computational algorithm calculate noise profile in real time, and dsp chip is loaded with the calculating noise of ARM minimum systems
The algorithm of sound field, by determining one group of base come the noise sound field for describing region, base is the different coordinate systems according to scene
To describe sound field, there are a coefficient arrays between sound field and this group of base, and in order to calculate this group of coefficient arrays, introduce error
Variance between descriptive equation, i.e. sound pressure signal frequency domain data array and sound field calculated value, in the case where variance is minimum, instead
Corresponding sound field coefficient arrays are can obtain to solving equation, so as to calculate noise sound field；
S4, operation active noise reduction sound wave algorithm calculate noise reduction sound wave, and dsp chip is according to the number of loudspeaker and reflecting for loudspeaker
Penetrate function to calculate overall control sound field, control sound field is the sound field superposition of loudspeaker array, and the mapping function of loudspeaker passes through
Test to loudspeaker can be calculated, and the electric signal of loudspeaker drives the mapping function of sound field in the hardware system of the loudspeaker
Just it has been determined that then introducing noise sound field and the control that noise reduction sound field descriptive equation, i.e. above-mentioned steps S3 are calculated when dispatching from the factory
Noise reduction result sound field after sound field superposition, in the case where the mapping function of noise sound field and control sound field is determined, then is determined
Minimum noise reduction result sound field, most suitable loudspeaker array of electrical signals can be drawn by reversely solving equation；
S5, system drive loudspeaker send anti-phase noise reduction sound wave, and the loudspeaker array of electrical signals that dsp chip obtains step S4 is sent out
DAC module is delivered to, the amplification loaded again by class-D amplifier by ARM minimum systems after being converted to analog signal through DAC module
Loudspeaker is delivered to after parameter amplification and sends anti-phase noise reduction acoustic wave form into Noise measarement sound field completion noise reduction；
S6, error feedback, noise information input module can measure the result of noise reduction and judge whether noise reduction is up to standard, is missed
Difference feedback, new noise sound field is calculated if not up to standard and above-mentioned noise reduction process is repeated.
Further, the statistics acoustic pressure data array that what step S2 was obtained obtain the corresponding monitoring point of microphone array is,
PXf(Xi, f), i：1,2,3 ... m；XiIt is the position coordinates of each monitoring point, m is the number of monitoring point, and f is that monitoring point is collected
The frequency domain statistics sound pressure level of signal.
Further, determine that one group of base is used to describe noise in step S3, base is equivalent to reference axis, with different reference axis
Form whole space is described, it is more to choose acoustic radiating mode, cavity mode, multistage son etc. according to application scenarios difference
Different bases is planted to describe whole sound field, one group of base Ψk(X f) is represented, k is the vectorial number of base, X is the position in space
Put, f is the frequency distribution of sound, with P, (X f) is stated sound field：
There are infinite multiple vectorial numbers on acoustics theory, i.e. k is that infinite system only introduces the vector of a part to calculate, to this
System introduces N number of vector to calculate, N<K, N selection be according to the complexity of scene sound field, amount of calculation requirement, hardware cost,
Accuracy requirement integrates to choose；
And for the C in formula before calculatingkCoefficient arrays, introduce error descriptive equation：
M is the number of monitoring point, J in error descriptive equation1It is the error for describing monitoring location calculated value and measured value
Variance, C is calculated by error equationkThe target of coefficient arrays is to determine Ck coefficient value so that error equation J1Value is minimum,
Write as matrix form,To ΨkThe basic function computing of each base vector is done, and is write as matrix
Form,J1Expression formula write as matrix form：Specific method is pair
J1Derivation, makes derivative be equal to zero, solves equation and obtain：
And be further derived from：Computing obtains CkThe expression formula of coefficient arrays：Finally giveWherein m is the number of monitoring point,It is to solve equation expansion coefficient matrix, finally gives CkCoefficient arrays.
Further, the number that loudspeaker array is determined in step S4 is L, the given driving telecommunications of each loudspeaker
Number, specific sound field, q can be formed1It is the electric signal of No. 1 speaker drive, Φ1(X f) is No. 1 loudspeaker electric signal
The mapping function of correspondence sound distribution, the mapping function of loudspeaker by measuring in advance after controlling electric signal drive the speaker sounding
Sound distributed data can just be measured in advance, first calculate overall control sound field Pc(X, f), the description of overall control sound field,
It is superimposed for the sound field of all loudspeaker arrays：
Then introduce noise reduction sound field descriptive equation J2：
Wherein Ω represents the object space of noise reduction, represents J2Be be loudspeaker to the integration L in Ω spaces number, q is loudspeaker
Electric signal driving, N is the vectorial number of selected base, i.e., the sound field calculating space dimension number, J2 is noise sound field
With noise reduction control sound field superposition, be the descriptive equation of noise reduction result sound field, solution the equation be exactly choose one group it is suitably electric
Signal q so that J2Value is minimum, and specific method is to J as step S32Derivation, makes derivative be equal to zero, so expansion side
Journey：
Thus loudspeaker array, the driving numerical expression of electric signal are obtained, system exports this group of electric signal drive the speaker battle array
Row send noise reduction control sound field, after being superimposed with former noise field so that total system completes the work of noise reduction.
Further, it should ensure that every section of timeslice has 50% overlapping portion in step S2.
The present invention directly can be judged the noise frequency that Mike receives by algorithm chip and circuit, find area
Domain sound field, so as to send anti-phase sound wave, offsets noise, it is not necessary to input car engine rotary speed information, directly received by Mike
To noise, it is not necessary to the sound after noise reduction is exported by inputting car engine rotating speed, to wind, tire, engine, vibrations, interior trim
The noise sent has good noise reduction, and electric car can also be used, and original automobile noise reduction system is to car engine noise reduction
Effect is not substantially, obvious to other noise noise reductions, and electric car noise of motor very little different with internal combustion engine, and other noises are
Main noise composition, so existing automobile noise reduction system is not obvious in that electronic parking lot scape noise reduction whole structure, we
Noise reduction system calculates all noise sound fields by microphone array independent of engine data in real time, engine, wind is made an uproar, tire is made an uproar vibrations
Noise has good effect, more practical in electric car scene, it is not required that by being adapted to vehicle rotating speed, plug and play.
Brief description of the drawings
Fig. 1 is the schematic diagram of vehicle-mounted active noise reduction system of the invention；
Fig. 2 is the flow chart of vehicle-mounted active denoising method of the invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, unless otherwise prescribed with limit, it is necessary to explanation, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connect or electrical connection or the connection of two element internals, can
To be to be joined directly together, it can also be indirectly connected to by intermediary.For the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
A kind of vehicle-mounted active noise reduction system according to embodiments of the present invention is described referring to Fig. 1, the system includes power supply
System, input module, output module and computing module, input module connection computing module, computing module connection output module are defeated
It is specifically noise information input module to enter module, and computing module includes dsp chip, and output module includes DAC module, D classes and amplified
Device and loudspeaker, noise information input module include microphone array and ADC, microphone array connection ADC, Mike
Wind array includes microphone, pre-amplifying module and the audio-frequency amplifier of acquisition noise information, and multigroup microphone array will be gathered
To noise information be delivered to ADC after pre-amplifying module and audio-frequency amplifier amplification and convert analog signals into numeral
Signal, above-mentioned audio-frequency amplifier, ADC, dsp chip, DAC module and class-D amplifier are connected with ARM minimum systems respectively,
Audio-frequency amplifier can be controlled with class-D amplifier by the connection with ARM minimum systems with the amplifying parameters of accurate control signal, be made an uproar
Acoustic intelligence is delivered to the multi-channel noise information gathered after ADC by ARM minimum systems to microphone array i.e. to each wheat
Gram corresponding signal all the way in wind array monitoring point carries out being pre-processed, the advanced row data slicer after digital-to-analogue conversion was entered,
I.e. temporally uniform cutting gathers signal, and ensures that every section of timeslice has 50% overlapping portion, then to each timeslice
Data carry out FFT Fourier transforms, each timeslice is obtained the frequency domain function of class frequency distribution, then to all timeslices
Frequency domain function do mean value computation obtain microphone array correspondence monitoring point statistics acoustic pressure data array, input module will supervise
The sound pressure signal frequency domain data array of measuring point is delivered to the dsp chip of computing module, and dsp chip is loaded with ARM minimum systems
Calculating noise sound field algorithm, by determine one group of base come the noise sound field for describing region, base be according to scene not
With coordinate system sound field described, there are a coefficient arrays between sound field and this group of base, and in order to calculate this group of factor arrays
Row, the variance introduced between error descriptive equation, i.e. sound pressure signal frequency domain data array and sound field calculated value is minimum in variance
In the case of, reversely solve equation and can obtain corresponding sound field coefficient arrays, so that noise sound field is calculated, while computing module
Overall control sound field is calculated according to the mapping function of the number of output module and loudspeaker, control sound field is loudspeaker array
Sound field is superimposed, and the mapping function of loudspeaker measures sound distributed data just in advance by controlling after electric signal drive the speaker sounding
It can in advance measure, then introduce the noise reduction result after noise reduction sound field descriptive equation, i.e. noise sound field are superimposed with control sound field
Sound field, in the case where the mapping function of noise sound field and control sound field is determined, then determines the noise reduction result sound field of minimum, instead
Most suitable loudspeaker array of electrical signals can be drawn to solving equation, dsp chip sends described loudspeaker array of electrical signals
To output module, the amplification loaded again by class-D amplifier by ARM minimum systems after being converted to analog signal through DAC module is joined
Loudspeaker is delivered to after number amplification and sends anti-phase noise reduction acoustic wave form into Noise measarement sound field completion noise reduction, now noise information input
Module can measure the result of noise reduction and judge whether noise reduction is up to standard, carry out error feedback, and new make an uproar is calculated if not up to standard
Several fields simultaneously repeat above-mentioned noise reduction process.
A kind of vehicle-mounted active denoising method, this method comprises the following steps：
S1, microphone array acquisition noise information, microphone by the error collected describe noise information through pre-amplifying module and
ADC is delivered to after audio-frequency amplifier amplification and converts analog signals into data signal, the connection audio amplification of ARM minimum systems
Device is to control amplification coefficient；
S2, multi-channel noise information pre-processing, the noise information that step S1 is obtained are delivered to after ADC by ARM minimum systems
Signal all the way corresponding to each microphone array monitoring point carries out pre-processing, the advanced line number after digital-to-analogue conversion was entered
According to section, i.e. temporally uniform cutting collection signal, and ensure that every section of timeslice has 50% overlapping portion, then to it is each when
Between the data of piece carry out FFT Fourier transforms, each timeslice is obtained the frequency domain function of class frequency distribution, then to all
The frequency domain function of timeslice does the statistics acoustic pressure data array that mean value computation obtains microphone array correspondence monitoring point, finally will
The sound pressure signal frequency domain data array of monitoring point is delivered to dsp chip；
S3, operation sound field computational algorithm calculate noise profile in real time, and dsp chip is loaded with the calculating noise of ARM minimum systems
The algorithm of sound field, by determining one group of base come the noise sound field for describing region, base is the different coordinate systems according to scene
To describe sound field, there are a coefficient arrays between sound field and this group of base, and in order to calculate this group of coefficient arrays, introduce error
Variance between descriptive equation, i.e. sound pressure signal frequency domain data array and sound field calculated value, in the case where variance is minimum, instead
Corresponding sound field coefficient arrays are can obtain to solving equation, so as to calculate noise sound field；
S4, operation active noise reduction sound wave algorithm calculate noise reduction sound wave, and dsp chip is according to the number of loudspeaker and reflecting for loudspeaker
Penetrate function to calculate overall control sound field, control sound field is the sound field superposition of loudspeaker array, and the mapping function of loudspeaker passes through
Measurement sound distributed data can just be measured in advance in advance after control electric signal drive the speaker sounding, then introduce noise reducing
The noise sound field that descriptive equation, i.e. above-mentioned steps S3 are calculated with control sound field be superimposed after noise reduction result sound field, it is determined that
In the case of the mapping function of noise sound field and control sound field, then the noise reduction result sound field of minimum is determined, reversely solved equation i.e.
Most suitable loudspeaker array of electrical signals can be drawn；
S5, system drive loudspeaker send anti-phase noise reduction sound wave, and the loudspeaker array of electrical signals that dsp chip obtains step S4 is sent out
DAC module is delivered to, the amplification loaded again by class-D amplifier by ARM minimum systems after being converted to analog signal through DAC module
Loudspeaker is delivered to after parameter amplification and sends anti-phase noise reduction acoustic wave form into Noise measarement sound field completion noise reduction；
S6, error feedback, now automobile describes noise inputs module as the error on neck periphery can measure the result of noise reduction and sentence
Whether disconnected noise reduction is up to standard, carries out error feedback, and new noise sound field is calculated if not up to standard and above-mentioned noise reduction process is repeated.
Further, the statistics acoustic pressure data array that what step S2 was obtained obtain the corresponding monitoring point of microphone array is,
PXf(Xi, f), i：1,2,3 ... m；XiIt is the position coordinates of each monitoring point, m is the number of monitoring point, and f is that monitoring point is collected
The frequency domain statistics sound pressure level of signal.
Further, determine that one group of base is used to describe noise in step S3, base is equivalent to reference axis, with different reference axis
Form whole space is described, it is more to choose acoustic radiating mode, cavity mode, multistage son etc. according to application scenarios difference
Different bases is planted to describe whole sound field, one group of base Ψk(X f) is represented, k is the vectorial number of base, X is the position in space
Put, f is the frequency distribution of sound, with P, (X f) is stated sound field：
There are infinite multiple vectorial numbers on acoustics theory, i.e. k is that infinite system only introduces the vector of a part to calculate, to this
System introduces N number of vector to calculate, N<K, N selection be according to the complexity of scene sound field, amount of calculation requirement, hardware cost,
Accuracy requirement integrates to choose；
And for the C in formula before calculatingkCoefficient arrays, introduce error descriptive equation：
M is the number of monitoring point, J in error descriptive equation1It is the error for describing monitoring location calculated value and measured value
Variance, C is calculated by error equationkThe target of coefficient arrays is to determine Ck coefficient value so that error equation J1Value is minimum,
Write as matrix form,To ΨkThe basic function computing of each base vector is done, and is write as matrix
Form,J1Expression formula write as matrix form：Specific method is pair
J1Derivation, makes derivative be equal to zero, solves equation and obtain：
And be further derived from：Computing obtains CkThe expression formula of coefficient arrays：Finally giveWherein m is the number of monitoring point,It is to solve equation expansion coefficient matrix, finally gives CkCoefficient arrays.
Further, the number that loudspeaker array is determined in step S4 is L, the given driving telecommunications of each loudspeaker
Number, specific sound field, q can be formed1It is the electric signal of No. 1 speaker drive, Φ1(X f) is No. 1 loudspeaker electric signal
The mapping function of correspondence sound distribution, the mapping function of loudspeaker by measuring in advance after controlling electric signal drive the speaker sounding
Sound distributed data can just be measured in advance, first calculate overall control sound field Pc(X, f), the description of overall control sound field,
It is superimposed for the sound field of all loudspeaker arrays：
Then introduce noise reduction sound field descriptive equation J2：
Wherein Ω represents the object space of noise reduction, represents J2Be be loudspeaker to the integration L in Ω spaces number, q is loudspeaker
Electric signal driving, N is the vectorial number of selected base, i.e., the sound field calculating space dimension number, J2 is noise sound field
With noise reduction control sound field superposition, be the descriptive equation of noise reduction result sound field, solution the equation be exactly choose one group it is suitably electric
Signal q so that J2Value is minimum, and specific method is to J as step S32Derivation, makes derivative be equal to zero, so expansion side
Journey：
Thus loudspeaker array, the driving numerical expression of electric signal are obtained, system exports this group of electric signal drive the speaker battle array
Row send noise reduction control sound field, after being superimposed with former noise field so that total system completes the work of noise reduction.
The present invention directly can be judged the noise frequency that Mike receives by algorithm chip and circuit, find area
Domain sound field, so as to send anti-phase sound wave, offsets noise, it is not necessary to input car engine rotary speed information, directly received by Mike
To noise, it is not necessary to the sound after noise reduction is exported by inputting car engine rotating speed, to wind, tire, engine, vibrations, interior trim
The noise sent has good noise reduction, and electric car can also be used, and original automobile noise reduction system is to car engine noise reduction
Effect is not substantially, obvious to other noise noise reductions, and electric car noise of motor very little different with internal combustion engine, and other noises are
Main noise composition, so existing automobile noise reduction system is not obvious in that electronic parking lot scape noise reduction whole structure, we
Noise reduction system calculates all noise sound fields by microphone array independent of engine data in real time, engine, wind is made an uproar, tire is made an uproar vibrations
Noise has good effect, more practical in electric car scene, it is not required that by being adapted to vehicle rotating speed, plug and play.
In the description of this specification, the description meaning of reference term " one embodiment ", " example " or " some examples " etc.
Refer at least one reality that the present invention is contained in reference to specific features, structure, material or the feature that the embodiment or example are described
Apply in example or example.In this manual, identical embodiment is not necessarily referring to the schematic representation of above-mentioned term or shown
Example.Moreover, specific features, structure, material or the feature of description can be in any one or more embodiments or example
Combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (6)
1. a kind of vehicle-mounted active noise reduction system, it is characterised in that the system include power-supply system, input module, output module and
Computing module, input module connection computing module, computing module connection output module, input module is specifically noise information input
Module, computing module includes dsp chip, and output module includes DAC module, class-D amplifier and loudspeaker, noise information input mould
Block includes microphone array and ADC, and microphone array connection ADC, microphone array includes acquisition noise information
Microphone, pre-amplifying module and audio-frequency amplifier, multigroup microphone array put big mould by the noise information collected is premenstrual
ADC, which is delivered to, after block and audio-frequency amplifier amplification converts analog signals into data signal, above-mentioned audio-frequency amplifier, ADC
Module, dsp chip, DAC module and class-D amplifier are connected with ARM minimum systems respectively, and audio-frequency amplifier leads to class-D amplifier
Cross and the connection of ARM minimum systems can be controlled with the amplifying parameters of accurate control signal, noise information be delivered to after ADC by
The multi-channel noise information that ARM minimum systems are gathered to microphone array is corresponding all the way to each microphone array monitoring point
Signal carries out being pre-processed, and in the advanced row data slicer after digital-to-analogue conversion, i.e., temporally uniform cutting gathers signal,
And ensure that every section of timeslice has 50% overlapping portion, then the data to each timeslice carry out FFT Fourier transforms, make every
Individual timeslice obtains the frequency domain function of class frequency distribution, then does mean value computation to the frequency domain functions of all timeslices and obtain
The statistics acoustic pressure data array of microphone array correspondence monitoring point, input module is by the sound pressure signal frequency domain data battle array of monitoring point
Row are delivered to the dsp chip of computing module, and dsp chip is loaded with the algorithm of the calculating noise sound field of ARM minimum systems, by true
Fixed one group of base is come the noise sound field for describing region, and base is the different coordinate systems according to scene to describe sound field, sound field with
There are a coefficient arrays between this group of base, and in order to calculate this group of coefficient arrays, introduce error descriptive equation, i.e. acoustic pressure and believe
Variance number between frequency domain data array and sound field calculated value, in the case where variance is minimum, reversely solves equation and can obtain
Corresponding sound field coefficient arrays, so that noise sound field is calculated, while number and loudspeaker of the computing module according to output module
Mapping function calculate overall control sound field, control sound field is the sound field superposition of loudspeaker array, the mapping function of loudspeaker
By controlling after electric signal drive the speaker sounding, measurement sound distributed data can just be measured in advance in advance, then introduce drop
Noise field descriptive equation, i.e. noise sound field with control sound field be superimposed after noise reduction result sound field, noise sound field and control is being determined
In the case of the mapping function of sound field processed, then determine minimum noise reduction result sound field, reversely solve equation can draw it is most suitable
Loudspeaker array of electrical signals, dsp chip sends described loudspeaker array of electrical signals to output module, is changed through DAC module
Sent to be delivered to loudspeaker after the amplifying parameters amplification that class-D amplifier is loaded by ARM minimum systems again after analog signal
Anti-phase noise reduction acoustic wave form completes noise reduction into Noise measarement sound field, and now noise information input module can measure the result of noise reduction and sentence
Whether disconnected noise reduction is up to standard, carries out error feedback, and new noise sound field is calculated if not up to standard and above-mentioned noise reduction process is repeated.
2. a kind of vehicle-mounted active denoising method of system as claimed in claim 1, it is characterised in that this method includes following step
Suddenly：
S1, microphone array acquisition noise information, microphone is by the ambient noise information collected through pre-amplifying module and audio
Be delivered to ADC after amplifier amplification and convert analog signals into data signal, ARM minimum systems connect audio-frequency amplifier with
Control amplification coefficient；
S2, multi-channel noise information pre-processing, the noise information that step S1 is obtained are delivered to after ADC by ARM minimum systems
Signal all the way corresponding to each microphone array monitoring point carries out pre-processing, the advanced line number after digital-to-analogue conversion was entered
According to section, i.e. temporally uniform cutting collection signal, and ensure that every section of timeslice has overlapping portion, then to each timeslice
Data carry out FFT Fourier transforms, each timeslice is obtained the frequency domain function of class frequency distribution, then to all timeslices
Frequency domain function do mean value computation obtain microphone array correspondence monitoring point statistics acoustic pressure data array, finally by monitoring point
Sound pressure signal frequency domain data array be delivered to dsp chip；
S3, operation sound field computational algorithm calculate noise profile in real time, and dsp chip is loaded with the calculating noise of ARM minimum systems
The algorithm of sound field, by determining one group of base come the noise sound field for describing region, base is the different coordinate systems according to scene
To describe sound field, there are a coefficient arrays between sound field and this group of base, and in order to calculate this group of coefficient arrays, introduce error
Variance between descriptive equation, i.e. sound pressure signal frequency domain data array and sound field calculated value, in the case where variance is minimum, instead
Corresponding sound field coefficient arrays are can obtain to solving equation, so as to calculate noise sound field；
S4, operation active noise reduction sound wave algorithm calculate noise reduction sound wave, and dsp chip is according to the number of loudspeaker and reflecting for loudspeaker
Penetrate function to calculate overall control sound field, control sound field is the sound field superposition of loudspeaker array, and the mapping function of loudspeaker passes through
Test to loudspeaker can be calculated, and the electric signal of loudspeaker drives the mapping function of sound field in the hardware system of the loudspeaker
Just it has been determined that then introducing noise sound field and the control that noise reduction sound field descriptive equation, i.e. above-mentioned steps S3 are calculated when dispatching from the factory
Noise reduction result sound field after sound field superposition, in the case where the mapping function of noise sound field and control sound field is determined, then is determined
Minimum noise reduction result sound field, most suitable loudspeaker array of electrical signals can be drawn by reversely solving equation；
S5, system drive loudspeaker send anti-phase noise reduction sound wave, and the loudspeaker array of electrical signals that dsp chip obtains step S4 is sent out
DAC module is delivered to, the amplification loaded again by class-D amplifier by ARM minimum systems after being converted to analog signal through DAC module is joined
Loudspeaker is delivered to after number amplification and sends anti-phase noise reduction acoustic wave form into Noise measarement sound field completion noise reduction；
S6, error feedback, noise information input module can measure the result of noise reduction and judge whether noise reduction is up to standard, is missed
Difference feedback, new noise sound field is calculated if not up to standard and above-mentioned noise reduction process is repeated.
3. a kind of vehicle-mounted active denoising method as claimed in claim 2, it is characterised in that what step S2 was obtained obtains microphone array
The statistics acoustic pressure data array of the corresponding monitoring point of row is, PXf(Xi, f), i：1,2,3 ... m；XiIt is the position of each monitoring point
Coordinate, m is the number of monitoring point, and f is the frequency domain statistics sound pressure level that monitoring point collects signal.
4. a kind of vehicle-mounted active denoising method as claimed in claim 3, it is characterised in that determine that one group of base is used to retouch in step S3
Noise is stated, base describes whole space with the form of different reference axis equivalent to reference axis, can be with according to application scenarios difference
A variety of different bases such as acoustic radiating mode, cavity mode, multistage son are chosen to describe whole sound field, one group of base Ψk(X, f)
To represent, k is the vectorial number of base, and X is the position in space, f is the frequency distribution of sound, and with P, (X f) is stated sound field：
There are infinite multiple vectorial numbers on acoustics theory, i.e. k is that infinite system only introduces the vector of a part to calculate, to this
System introduces N number of vector to calculate, N<K, N selection be according to the complexity of scene sound field, amount of calculation requirement, hardware cost,
Accuracy requirement integrates to choose；
And for the C in formula before calculatingkCoefficient arrays, introduce error descriptive equation：
M is the number of monitoring point, J in error descriptive equation1It is the error for describing monitoring location calculated value and measured value
Variance, C is calculated by error equationkThe target of coefficient arrays is to determine Ck coefficient value so that error equation J1Value is minimum, writes
Into matrix form,To ΨkThe basic function computing of each base vector is done, and is write as rectangular
Formula,J1Expression formula write as matrix form：Specific method is to J1
Derivation, makes derivative be equal to zero, solves equation and obtain：
And be further derived from：Computing obtains CkThe expression formula of coefficient arrays：Finally giveWherein m is the number of monitoring point,It is to solve equation expansion coefficient matrix, finally gives CkCoefficient arrays.
5. a kind of vehicle-mounted active denoising method as claimed in claim 4, it is characterised in that loudspeaker array is determined in step S4
Number is L, the given driving electric signal of each loudspeaker, can form specific sound field, q1It is No. 1 speaker drive
Electric signal, Φ1(X is f) that No. 1 loudspeaker electric signal corresponds to the mapping function that sound is distributed, the mapping function of loudspeaker passes through
Measurement sound distributed data can just be measured in advance in advance after control electric signal drive the speaker sounding, first calculate overall control
Sound field P processedc(X, f), the description of overall control sound field are superimposed for the sound field of all loudspeaker arrays：
Then introduce noise reduction sound field descriptive equation J2：
Wherein Ω represents the object space of noise reduction, represents J2Be be loudspeaker to the integration L in Ω spaces number, q is loudspeaker
Electric signal drives, and N is the vectorial number of selected base, i.e. the sound field calculates the dimension number in space, J2 be noise sound field with
Noise reduction controls the superposition of sound field, is the descriptive equation of noise reduction result sound field, and the solution equation is exactly to choose one group of suitable telecommunications
Number q so that J2Value is minimum, and specific method is to J as step S32Derivation, makes derivative be equal to zero, so EXPANSION EQUATION FOR STEEL：
Thus loudspeaker array, the driving numerical expression of electric signal are obtained, system exports this group of electric signal drive the speaker battle array
Row send noise reduction control sound field, after being superimposed with former noise field so that total system completes the work of noise reduction.
6. a kind of vehicle-mounted active denoising method as claimed in claim 2, it is characterised in that every section of timeslice is should ensure that in step S2
There is 50% overlapping portion.
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|---|---|---|---|---|
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201995115U (en) * | 2011-01-28 | 2011-09-28 | 比亚迪股份有限公司 | In-vehicle noise reduction system |
| CN102837654A (en) * | 2012-05-25 | 2012-12-26 | 苏州卡泰克电子科技有限公司 | Interior noise electronic active inhibition system |
| CN204206436U (en) * | 2014-09-30 | 2015-03-11 | 北京交通大学 | A kind of audio processing modules for active noise controlling |
| CN104469154A (en) * | 2014-12-05 | 2015-03-25 | 合肥国科声拓信息技术有限公司 | Camera guiding device and method based on microphone array |
| CN104616667A (en) * | 2014-12-02 | 2015-05-13 | 清华大学 | Active noise reduction method for automobile |
| CN205584419U (en) * | 2016-03-16 | 2016-09-14 | 中航华东光电（上海）有限公司 | Wind denoising system |
-
2016
- 2016-11-03 CN CN201610967849.5A patent/CN107086034B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201995115U (en) * | 2011-01-28 | 2011-09-28 | 比亚迪股份有限公司 | In-vehicle noise reduction system |
| CN102837654A (en) * | 2012-05-25 | 2012-12-26 | 苏州卡泰克电子科技有限公司 | Interior noise electronic active inhibition system |
| CN204206436U (en) * | 2014-09-30 | 2015-03-11 | 北京交通大学 | A kind of audio processing modules for active noise controlling |
| CN104616667A (en) * | 2014-12-02 | 2015-05-13 | 清华大学 | Active noise reduction method for automobile |
| CN104469154A (en) * | 2014-12-05 | 2015-03-25 | 合肥国科声拓信息技术有限公司 | Camera guiding device and method based on microphone array |
| CN104469154B (en) * | 2014-12-05 | 2017-09-26 | 合肥国科声拓信息技术有限公司 | A kind of camera guide device and bootstrap technique based on microphone array |
| CN205584419U (en) * | 2016-03-16 | 2016-09-14 | 中航华东光电（上海）有限公司 | Wind denoising system |
Non-Patent Citations (2)
| Title |
|---|
| J STUART BOLTON,YANGFAN LIU: "Sound Field Reconstruction at High Frequencies", 《INSTITUTE OF NOISE CONTROL ENGINEERING》 * |
| YANGFAN LIU，J STUART BOLTON: "《Experimental Investigation of the Use of Equivalent》", 《INSTITUDE OF NOISE CONTROL ENGINEERING》 * |
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