CN108088064A - Arranged on ventilation nozzle and it is capable of active noise reducing device and the control method that acoustics interacts - Google Patents
Arranged on ventilation nozzle and it is capable of active noise reducing device and the control method that acoustics interacts Download PDFInfo
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- CN108088064A CN108088064A CN201810036999.3A CN201810036999A CN108088064A CN 108088064 A CN108088064 A CN 108088064A CN 201810036999 A CN201810036999 A CN 201810036999A CN 108088064 A CN108088064 A CN 108088064A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to a kind of active noise reducing device for being arranged on ventilation nozzle and being capable of acoustics interaction, including a housing, a loud speaker, one with reference to microphone, a plurality of error microphones, a controller and an air diffuser；The loud speaker is arranged in the housing；It is described to be arranged on the case top and the acoustics input terminal with reference to microphone towards the outside of the housing with reference to microphone；Each error microphone is arranged on the bottom surface of the housing and is provided close to the position of the bottom edge；The controller is arranged in the housing, and the loud speaker is connected to the controller with reference to microphone and the equal lead of each error microphone；The center of the air diffuser opens up a third through-hole, and the bottom surface of the housing is arranged in the third through-hole.The present invention also provides a kind of active noise reduction control methods for being capable of acoustics interaction.The configuration of the present invention is simple, it is small, and can realize that acoustics interacts by active noise reducing device while active noise reduction.
Description
Technical field
The present invention relates to noise control technique fields, and in particular to a kind of to be arranged on ventilation nozzle and be capable of having for acoustics interaction
Source denoising device and control method.
Background technology
With the progress and the improvement of people's living standards of modern society, the problem of noise pollution, becomes increasingly conspicuous, sternly
Daily life is affected again.With the extensive use of noise control technique, come from central air-conditioning, fresh air system disengaging
The noise in air port, it has also become one of Main Noise Sources under indoor environment.The noise frequency ingredient is more prominent, it is difficult to limited
Space in effectively inhibited by passive noise reduction means.
Active noise control is a kind of noise impedance technology based on sound wave coherent superposition principle, and basic principle is
Secondary sound source is introduced in sound field and sends " antinoise " identical with raw noise amplitude but opposite in phase using it, makes original
Beginning noise obtains relevant counteracting, so as to achieve the purpose that noise suppressed.Technique of Active Noise Control is small, light-weight, is controlling
There is significant advantage during low-frequency noise processed.Notification number is the patent of invention of CN104165255B《A kind of main quilt of air pipeline
Dynamic composite muffler》, optimized mainly for high wind speed air pipeline (such as ship), complicated, volume compared with
Greatly, it is difficult to for pipelines such as central air-conditioning, the fresh air system under daily indoor environment.Simultaneously the loud speaker in the technical solution,
Microphone is all placed in inside pipeline, is only capable of realizing noise reduction, does not possess acoustics interactive function.
With the popularization of the equipment such as intelligent sound and the extensive use of interactive voice, the demand of acoustics interactive function is by day
It is beneficial urgent.In order to inhibit low-frequency noise, active noise control system must possess acoustics and output and input device (such as microphone
And loud speaker), the acoustical signal (such as human hair go out voice) of target area can be picked up and (example is made a sound in target area
Such as music), this for simultaneously realize that acoustics interactive function provides necessary condition.However, phase between active noise reduction and acoustics interaction
Mutually form interference：The microphone of active noise reduction system is typically placed at the more significant position of low-frequency noise, this is to extracting target
The acoustic signals such as the voice in region bring larger interference；In addition, directly music etc. is played using the loud speaker of active noise reduction system
During acoustical signal, strong interference will be formed to adaptive noise reduction algorithm, seriously affects the normal operation of system.How by active noise reduction
It interacts and organically combines with acoustics, still lack effective ways at present.
The content of the invention
In order to solve the above technical problem, the present invention provides a kind of active drops for being arranged on ventilation nozzle and being capable of acoustics interaction
It makes an uproar device and control method, can realize that acoustics interacts while active noise reduction is realized.
Technical solution one：
Arranged on ventilation nozzle and it is capable of the active noise reducing device of acoustics interaction, including a housing, a loud speaker, one with reference to biography
Sound device, a plurality of error microphones, a controller and an air diffuser；A first through hole, institute are opened up on the bottom surface of the housing
It states and one second through hole is opened up at the top of housing；The loud speaker is arranged in the housing, and its cone is outwardly and arranged on described the
On one through hole, the housing forms the back cavity of the loud speaker with the inner space that the loud speaker surrounds；The reference is transaudient
Device is arranged on second through hole and the acoustics input terminal with reference to microphone is towards the outside of the housing；Each error
Microphone is arranged on the bottom surface of the housing and is provided close to the position of the bottom edge, the sound of each error microphone
Input terminal is learned towards the outside of the housing；The controller be arranged on the housing in, the loud speaker, with reference to microphone with
And each equal lead of error microphone is connected to the controller；The center of the air diffuser opens up a third through-hole, described
The bottom surface of housing is arranged in the third through-hole, and when the air diffuser is installed on ventilation nozzle, the housing is equipped with reference
The one side of microphone is used as inside, and arranged on the inside of the ventilation nozzle, the bottom surface of the housing is used as outside, arranged on described logical
Air hose mouth makes the loud speaker directly to indoor sounding.
More preferably, the controller includes a wireless communication module and an A/D converter connected in sequence, a number letter
Number processor, a D/A converter and a power amplifier, external voice-operated device pass through the wireless communication module and the number
Signal processor carries out two-way communication, A/D converter acquisition it is described with reference to microphone and each error microphone it is defeated
Go out signal, the D/A converter will need the signal output that loud speaker plays to the power amplifier, the power amplifier
Connect the loud speaker.
More preferably, the active noise reducing device further includes a sound-absorbing material layer, in addition to the bottom surface of the housing, the housing
Outer surface be equipped with the sound-absorbing material layer, including the outside with reference to microphone, the sound-absorbing material layer is for increasing quilt
Dynamic noise reduction, while reduce the wind with reference to microphone and make an uproar.
More preferably, the housing is conical shell, and second through hole is opened in the top of the conical shell, the ginseng
It examines microphone to be seal-installed on second through hole, the mode of the sealed connection includes viscose or adds cushion.
Technical solution two：
A kind of active noise reduction control method for being capable of acoustics interaction, the sound letter with reference in microphone pickup ventilation shaft
Number, including inside pipeline original noise, the reverse phase noise signal that is sent by loud speaker and played by loud speaker
The audio signal of external voice-operated device input；The acoustical signal that the error microphone is picked up includes：By pipeline internal communication
Residual noise signal that the reverse phase noise signal that sends of original noise and loud speaker come is formed by stacking is played by loud speaker
The audio signal of external voice-operated device input and the control voice that goes out of human hair；It is equipped with simultaneously in the digital signal processor
The software module for being used to handle acoustical signal of operation, enhances module including a noise reduction module, an echo cancellation module and a noise reduction；
In processing noise reduction and acoustics interaction, the noise reduction module, echo cancellation module and noise reduction enhancing module are run simultaneously, no
Successively order；
The control method is specific as follows：
The low frequency radiation noise for inhibiting to generate in ventilation shaft by the noise reduction module：The noise reduction module includes noise reduction
Wave filter, acoustic feedback path model, secondary channel model and filter update algoritic module；The noise filter is by pipeline
Output reverse phase noise identical with raw noise amplitude but opposite in phase, the reverse phase are made an uproar after internal raw noise filtering process
Output signal as the noise reduction module after sound is superimposed with the audio signal of the external voice-operated device input is raised described in driving
Sound device, while the input also as the acoustic feedback path model；The output signal of the noise reduction module passes through the acoustic feedback
It negates after channel pattern filtering, then is overlapped with the acoustical signal picked up with reference to microphone, the ginseng is eliminated after superposition
Examine the reverse phase noise signal sent by loud speaker that microphone picks up and the external voice-operated device input that is played by loud speaker
Audio signal, the raw noise being only left inside pipeline, using the raw noise as the input of the noise filter, meanwhile,
Input of the raw noise also as the secondary channel model, the raw noise pass through the secondary channel model filtering
Input as the filter update algoritic module afterwards；
The control voice gone out by echo cancellation module acquisition human hair：The echo cancellation module includes plural height
Module, the submodule are corresponded with the error microphone and set, and each submodule includes an echo cancellation filter and one
Adaptive algorithm module；The input of the echo cancellation filter is the audio signal of external voice-operated device input, is filtered
After negate, then the acoustical signal picked up with the error microphone is overlapped, and the signal after the superposition is as the submodule
Output signal, the output signal of the submodule eliminates the audio that the external voice-operated device played by the loud speaker inputs
The output signal of the submodule is sent to external acoustic control by signal, but the control voice including people by wireless communication module
Equipment with reference to the audio signal that external voice-operated device is inputted by the wireless communication module, realizes acoustics interaction；Meanwhile institute
The output signal for stating submodule is also defeated with the filter update algoritic module as inputting for the adaptive algorithm module
Enter, the input of the adaptive algorithm module further includes the audio signal of external voice-operated device input, the adaptive algorithm mould
For updating the parameter of the echo cancellation filter, the adaptive algorithm module is inputted according to external voice-operated device for block output
Audio signal and submodule output signal, the parameter of echo cancellation filter is adaptively adjusted, the purpose is to more
The audio signal of the external voice-operated device played by the loud speaker the input of error microphone pickup is eliminated well；
The input of the filter update algoritic module includes the output signal of secondary channel model and each echo cancelltion
The superposition of the output signal of submodule, the output of the filter update algoritic module is for the coefficient to the noise filter
It is adaptively adjusted, the purpose is to preferably inhibit the residual noise signal of error microphone pickup, so as to fulfill more preferably
Active noise reduction effect.
The input of the noise reduction enhancing module is the parameter of each echo cancellation filter, and the noise reduction enhancing module will
The parameter of each echo cancellation filter be overlapped and time domain it is smooth after, new parameter of the result as secondary channel model,
Realize the real-time update of secondary channel model.
More preferably, the noise filter, acoustic feedback path model, secondary channel model and echo cancellation filter are equal
Using FIR filter, wherein the secondary channel model and the echo cancellation filter have identical order.
The present invention has the advantages that：
(1) active noise reducing device provided by the invention, without being transformed to original pipe-line system, small, user
Just, can effectively inhibit from ventilation low-frequency noise of the nozzle to indoor radiation；
(2) active noise reducing device provided by the invention by reference to the noise in sensor pickup ventilation shaft, and passes through
Loud speaker plays reverse phase noise, and the noise in pipeline and reverse phase noise is made to cancel out each other, so as to effectively inhibit ventilation nozzle to room
The low-frequency noise of interior radiation；
(3) active noise reducing device provided by the invention is picked up the voice of people by error microphone, is played by loud speaker
Externally input audio signal realizes acoustics interaction；
(4) in active noise reduction control method provided by the invention, have it is low voice speaking put with array sound perceptional function, make an uproar active
Acoustic control and acoustics interactive function organically combine, mutually promote, and the two is made to have better performance when relatively working independently.
Description of the drawings
Fig. 1 is the structure diagram of active noise reducing device of the present invention；
Fig. 2 is the front view of active noise reducing device of the present invention；
Fig. 3 is the schematic diagram of controller in active noise reducing device of the present invention；
Fig. 4 is the system block diagram of active noise reduction control method of the present invention；
Fig. 5 is the FB(flow block) of active noise reduction control method of the present invention.
Reference numeral is expressed as in figure：
1st, housing；11st, first through hole；12nd, the second through hole；2nd, loud speaker；21st, cone；3rd, with reference to microphone；4th, error passes
Sound device；5th, controller；51st, wireless communication module；52nd, A/D converter；53rd, digital signal processor；54th, D/A converter；55、
Power amplifier；6th, air diffuser；61st, third through-hole；7th, external voice-operated device；8th, sound-absorbing material；100th, noise reduction module；101st, drop
It makes an uproar wave filter；102nd, acoustic feedback path model；103rd, secondary channel model；104th, filter update algoritic module；200th, echo
Cancellation module；201st, echo cancellation filter；202nd, adaptive algorithm module；300th, noise reduction enhancing module.
Specific embodiment
The present invention will be described in detail for Fig. 1 to Fig. 5 and specific embodiment below in conjunction with the accompanying drawings.
Embodiment one：
Please refer to Fig.1 and Fig. 2, arranged on ventilation nozzle and be capable of the active noise reducing device of acoustics interaction, including a housing 1,
One loud speaker 2, one is dissipated with reference to microphone 3, a plurality of error microphones 4 (Fig. 1 to Fig. 3 shows four), a controller 5 and one
Flow device 6；A first through hole 11 is opened up on the bottom surface of the housing 1, the top of the housing 1 opens up one second through hole 12；It is described
Loud speaker 2 is arranged in the housing 1, and its cone 21, outwardly and in the first through hole 11, the housing 1 is raised with described
The inner space that sound device 2 surrounds forms the back cavity of the loud speaker 2；It is described to be arranged on reference to microphone 3 on second through hole 12
And the acoustics input terminal with reference to microphone 3 is towards the outside of the housing 1；Each error microphone 4 is arranged on described
On the bottom surface of housing 1 and it is provided close to the position of the bottom edge, the equal direction of acoustics input terminal of each error microphone 4
The outside of the housing 1 utilizes the noise measured with reference to microphone 3 outside housing 1；The controller 5 is arranged on the housing 1
Interior, the loud speaker 2 is connected to the controller 5 with reference to microphone 3 and 4 equal lead of each error microphone；The air diffuser
6 center opens up a third through-hole 61, and the bottom surface of the housing 1 is arranged in the third through-hole 61, by the air diffuser 6
When being installed on ventilation nozzle, the housing 1 is equipped with the one side conduct inside with reference to microphone 3, arranged on the ventilation nozzle
The acoustical signal in ventilation shaft is picked up in inside, and the bottom surface of the housing 1 is used as outside, arranged on the ventilation nozzle, makes described raise
Sound device 2 picks up indoor acoustical signal directly to indoor sounding using bottom surface error microphone 4.Air diffuser in the present embodiment
Whole rectangular, the bottom surface of housing 1 is correspondingly arranged in the ventilation nozzle of rectangle；In other embodiments, the bottom surface of housing 1, lattice
Grid also can be rounded, and air diffuser is integrally rounded at this time, is correspondingly arranged in circular ventilation nozzle.
The all parts of the active noise reducing device of the present invention are described further below.
In the present embodiment, as shown in Figure 1, the active noise reducing device further includes a sound-absorbing material layer 8, except the housing
Outside 1 bottom surface, the outer surface of the housing 1 is equipped with the sound-absorbing material layer 8, described including the outside with reference to microphone 3
Sound-absorbing material layer 8 reduces the wind with reference to microphone 3 and makes an uproar for increasing passive noise reduction.
The housing 1 is conical shell, and second through hole 12 is opened in the top of the conical shell, described with reference to biography
Sound device 3 is installed on second through hole 12, select conical shell the advantages of be：Windage is low, will not additionally generate noise.
It is described to be tightly connected with reference to the junction of microphone 3 and second through hole 12, the mode bag of the sealed connection
It includes viscose or adds cushion.
Referring to Fig. 3, the controller 5 include a wireless communication module 51 and an A/D converter 52 connected in sequence,
One digital signal processor 53, a D/A converter 54 and a power amplifier 55, external voice-operated device 7 pass through the channel radio
Believe that module 51 carries out two-way communication with the digital signal processor 53, the A/D converter 52 gathers described with reference to microphone 3
With the output signal of each error microphone 4, the D/A converter 54 will need the signal output that loud speaker 2 plays to institute
Power amplifier 55 is stated, the power amplifier 55 connects the loud speaker 2.
The present invention operation principle be：The active noise reducing device is installed at ventilation nozzle, it is described to refer to microphone 3
In ventilation shaft, the acoustical signal of pickup includes：Original noise inside pipeline, the reverse phase sent by loud speaker 2
The audio signal that noise signal and the external voice-operated device 7 played by loud speaker 2 input, wherein reverse phase noise signal is described
The noise identical with raw noise amplitude but opposite in phase sent after the processing of digital signal processor 53, the reverse phase noise is in pipe
Mouth is external to cancel out each other with raw noise, and so as to the low-frequency noise significantly to decay from ventilation nozzle to indoor radiation, realization has
Source noise reduction.The error microphone 4 is located at ventilation duct road junction, and the acoustical signal of pickup includes：By pipeline internal communication Lai original
Residual noise signal that the reverse phase noise signal that beginning noise signal and loud speaker (2) are sent is formed by stacking is played by loud speaker 2
The control voice that the audio signal and human hair that external voice-operated device 7 inputs go out.Wherein, active noise reduction can significantly decay described
Residual noise signal, and the audio signal that the external voice-operated device 7 inputs can be by the digital signal processor 53 at
Reason eliminates, and so as to obtain pure control voice, and then transmits control voice to external acoustic control by wireless communication module 51 and sets
Standby 7；Meanwhile the source of sound input of external voice-operated device 7 is sent to by the digital signal processor by wireless communication module 51
53,2 sounding of loud speaker is promoted through power amplifier 55 after being handled by digital signal processor 53, is set so as to fulfill with external acoustic control
Standby 7 acoustics interactive function.
Embodiment two：
Refer to Fig. 4 and Fig. 5, a kind of active noise reduction control method for being capable of acoustics interaction, in conjunction with the embodiments described in one
Active noise reducing device, it is described with reference to microphone 3 pick up ventilation shaft in acoustical signal, including the raw noise inside pipeline
The audio letter that signal, the reverse phase noise signal sent by loud speaker 2 and the external voice-operated device 7 played by loud speaker 2 input
Number；The acoustical signal that the error microphone 4 is picked up includes：By pipeline internal communication Lai original noise and loud speaker
Residual noise signal that the 2 reverse phase noise signals sent are formed by stacking, the external voice-operated device 7 played by loud speaker 2 input
The control voice that audio signal and human hair go out；The interior software mould for being equipped with to handle acoustical signal of the digital signal processor 53
Block enhances module 300 including a noise reduction module 100, an echo cancellation module 200 and a noise reduction；Three runs simultaneously, regardless of elder generation
Order afterwards；
The control method is specific as follows：
The low frequency radiation noise for inhibiting to generate in ventilation shaft by the noise reduction module 100, specifically：The noise reduction mould
Block 100 includes noise filter 101, acoustic feedback path model 102, secondary channel model 103 and filter update algorithm mould
Block 104；The noise filter 101 will after the raw noise filtering process inside pipeline export it is identical with raw noise amplitude but
The reverse phase noise of opposite in phase, the reverse phase noise are used as institute after being superimposed with the audio signal that the external voice-operated device 7 inputs
The output signal of noise reduction module 100 is stated, drives the loud speaker 2, while the output signal of the noise reduction module 100 is also used as institute
State the input of acoustic feedback path model 102；The output signal of the noise reduction module 100 passes through the acoustic feedback path model 102
It negates after filtering, then is overlapped with the acoustical signal picked up with reference to microphone 3, eliminated after superposition described with reference to microphone
The audio that the 3 reverse phase noise signals sent by loud speaker 2 picked up and the external voice-operated device 7 played by loud speaker 2 input
Signal, the raw noise being only left inside pipeline, using the raw noise as the input of the noise filter 101, meanwhile, institute
Input of the raw noise also as the secondary channel model 103 is stated, the raw noise passes through the secondary channel model 103
Input after filtering as the filter update algoritic module 104；
The control voice gone out by the echo cancellation module 200 acquisition human hair, specifically：The echo cancellation module
200 include a plurality of submodules, and the submodule is corresponded with the error microphone 4 and set, and each submodule includes one time
201 and one adaptive algorithm module 202 of sound neutralizing filter；The input of the echo cancellation filter 201 sets for external acoustic control
The audio signal of standby 7 input, negates after being filtered, then the acoustical signal picked up with the error microphone 4 is overlapped, should
Output signal of the signal as the submodule after superposition, the output signal of the submodule are eliminated by the loud speaker 2
The audio signal that the external voice-operated device 7 of broadcasting inputs, but the control voice including people, the output signal of the submodule is led to
It crosses wireless communication module 51 and is sent to external voice-operated device 7, it is defeated by the wireless communication module 51 with reference to external voice-operated device 7
The audio signal entered realizes acoustics interaction.
Meanwhile input and the filtering of the output signal of the submodule also as the adaptive algorithm module 202
Device updates the input of algoritic module 104, and the input of the adaptive algorithm module 202 further includes what external voice-operated device 7 inputted
Audio signal, the adaptive algorithm module 202 export to update the parameter of the echo cancellation filter 201.
The audio signal and the output of submodule that the adaptive algorithm module 202 is inputted according to external voice-operated device 7 are believed
Number, the parameter of echo cancellation filter 201 is adaptively adjusted, the purpose is to preferably eliminate error microphone 4 to pick up
Played by the loud speaker 2 external voice-operated device input 7 audio signal；
The input of the filter update algoritic module 104 include secondary channel model 103 output signal and each time
Sound offsets the superposition of the output signal of submodule, and the output of the ripple device update algoritic module 104 is for the noise reduction filtering
The coefficient of device 101 is adaptively adjusted, the purpose is to preferably inhibit the residual noise signal of the pickup of error microphone 4, from
And realize more preferably active noise reduction effect.
The algorithm that the filter update algoritic module 104 and adaptive algorithm module use leads to including LMS, RLS, AP etc.
Adaptive algorithm.
In the present embodiment, the noise filter 101, acoustic feedback path model 102, secondary channel model 103 and
Echo cancellation filter 201 is using FIR filter, wherein the secondary channel model 103 and echo cancellation filter 201
With identical exponent number.
The input of the noise reduction enhancing module 300 is the parameter of each echo cancellation filter 201, and the noise reduction enhances
Module 300 by the parameter of each echo cancellation filter 201 be overlapped and time domain it is smooth after, result is as secondary channel mould
The new parameter of type 103 realizes the real-time update of secondary channel model 103.
In the application scenarios of active noise reduction control method of the present invention, in 100 initial operating stage of noise reduction module, noise reduction module
100 off-duties are stablized, and the acoustical signal that error microphone 4 is picked up is made of three parts：First, from ventilation shaft nozzle to interior
The low-frequency noise of radiation, second is that the audio signal (such as music) that the external voice-operated device 7 played by loud speaker 2 inputs, third,
The control voice that human hair goes out.These three acoustical signal ingredients form interference between each other, so as to influence different Acoustic treatment modules
Functional effect.
First, after 100 steady operation of noise reduction module, will be obtained significantly from nozzle to the low frequency noise component of interior radiation
Degree inhibits, and the low-frequency noise of slave ventilation shaft nozzle to indoor radiation that error microphone 4 is picked up obtains largely at this time
Attenuation.The basic principle of the noise reduction module 100：By picking up the original noise inside pipeline with reference to microphone 3, through noise reduction
The filtering of wave filter 101 and drive the speaker 2 sends identical with raw noise amplitude but opposite in phase reverse phase noise, the noise with
Raw noise is cancelled out each other, so as to the low-frequency noise significantly to decay from ventilation nozzle to indoor radiation.But in real work
The signal picked up with reference to microphone 3 mainly includes four parts：When the original noise inside pipeline, second is that by loud speaker 2
The reverse phase noise sent, third, the audio signal (such as music) that the external voice-operated device 7 played by loud speaker 2 inputs, fourth,
The control voice that human hair goes out.Due to being placed in inside pipeline with reference to microphone 3, above Part IV signal it is weaker, influencing can be with
Ignore；However, second and third part will form feedback control loop, the normal operation of severe jamming noise reduction module 100.In order to eliminate this
One feedback control loop establishes loud speaker 2 to reference to the acoustic transfer function model between microphone 3 using acoustic feedback path model 102,
So as to be predicted second and third part signal and be eliminated from reference signal.
The signal of drive the speaker 2 includes two-part superposition：First, the output of noise filter 101, drive the speaker 2
Reverse phase noise will be sent, completes active noise reduction function；Second is that the audio-signal-driven loud speaker 2 that external voice-operated device 7 inputs is complete
It is put into low voice speaking, that is, sends the desired sound of user, such as music.
After 100 the operation is stable of noise reduction module, the reverse phase noise that loud speaker 2 is sent will mutually be supported with air pipeline raw noise
Disappear, so as to first portion's noise energy that significantly attenuated error microphone 4 picks up.However, since 2 range error of loud speaker passes
Sound device 4 is relatively near, and audio signal (i.e. the desired sound of user) energy that the external voice-operated device 7 that loud speaker 2 plays inputs is larger,
Strong interference will be formed to other indoor acoustical signal ingredients.The function of echo cancellation module 200 is to remove this interference, should
The signal-to-noise ratio of other indoor acoustical signal ingredients will be largely increased in module output signal.
Secondly, when noise reduction module 100 is introduced into steady-working state, in each submodule output signal of echo cancelltion still
With stronger nozzle low frequency radiation noise contribution.Therefore, noise reduction is inputted after all echo cancelltion submodule output Signal averagings
Module 100, the filter update algoritic module 104 is by the low-frequency noise energy adjusting noise reduction filtering in the superposed signal
The parameter of device 101 makes noise reduction module 100 into stable working condition.The filter update algoritic module 104 another
Input is original noise in the pipe filtered through secondary channel model 103, and loud speaker 2 is established using secondary channel model 103
To the acoustic transfer function model of the sum of all 4 pickoff signals of error microphone.The filter update algoritic module 104 can be adopted
With the universal adaptives algorithm such as LMS, RLS, AP.
In Active noise control field, secondary channel model 103 refers to loud speaker 2 to the transmission letter between error microphone 4
Number, the transmission function of middle finger loud speaker 2 of the present invention to the sum of all 4 signals of error microphone.As previously mentioned, noise reduction module 100
The middle automatic adjusument function of needing to complete 101 parameter of noise filter using the model of this transmission function.In practical application,
It is influenced by barrier, detecting indoor article movement and 2 fatigue properties of loud speaker, the frequency response of secondary channel is often time-varying.This
It will make difference occur between secondary channel model 103 and real response, so as to influence the noise reduction even stability of integral module.
And effective estimation to time-varying secondary channel model 103 is contained in echo cancellation module 200 just, therefore enhanced using noise reduction
Module combines echo cancellation module 200 and noise reduction module 100.
Specific implementation process is provided in conjunction with specific algorithm：
Each signal represents as follows：With reference to microphone signal x (n), the i-th tunnel error microphone signal ei(n), external sound source is defeated
Enter signal l (n), noise filter output signal u (n), noise reduction module output signal y (n), acoustic feedback path model output signal
F (n), secondary channel model output signal r (n), corresponding to the echo cancelltion submodule output signal d of the i-th tunnel error microphonei
(n)。
Noise reduction module 100：
Noise filter 101 is a N rank FIR filters, and coefficient is w (n)=[w1(n),w2(n),...,wN(n)], filter
The input of ripple device, output are respectively：
P (n)=x (n)-f (n),
The output of noise reduction module 100 is the superposition of u (n) and l (n)：Y (n)=u (n)+l (n), the signal are put by power
55 drive the speaker of big device, 2 sounding；
Meanwhile input signals of the y (n) also as acoustic feedback path model 102, generate output f (n+1)；Acoustic feedback path
Model 102 is a K rank FIR filters, filter coefficient b=[b1,b2,...,bK], input/output relation is：
Secondary channel model 103 is a L rank FIR filters, filter coefficient s (n)=[s1(n),s2(n),...,sL
(n)], input/output relation is：
By all di(n) superposition obtains d (n), using r (n) with d (n), according to LMS algorithm to 101 coefficient of noise filter
Carry out adaptive updates：
wi(n+1)=wi(n)-μ d (n) r (n-i),
In formula μ be a constant, typical value 0.1.
Initialization：Before algorithm performs, w (0) is set to 0, and b and s (0) are then obtained by the method that off-line system recognizes, wherein sound
Feedback channel model 102 is the transmission function between 55 input signal of power amplifier and the reference output signal of microphone 3, and secondary
Channel pattern 103 is then the transmission function between 55 input signal of power amplifier and the output superposed signal of all error microphones 4.
Echo cancellation module 200：
Echo cancellation filter 201 corresponding to i-th of echo cancelltion submodule is a L rank FIR filters, wave filter
Coefficient ci(n)=[ci1(n),ci2(n),...,ciL(n)] l (n) and output k, are inputtedi(n) relation is：
The output of the echo cancelltion submodule is：
di(n)=ei(n)-ki(n)；
Using LMS algorithm to ci(n) it is updated：
cij(n+1)=cij(n)-ηdi(n) l (n-j),
In formula η be a constant, typical value 0.1.
Initialization：Before algorithm performs, ci(n) it is set to 0.
Noise reduction enhances module 300：
By all 201 coefficient c of echo cancellation filteri(n) it is added, is handled, obtained using time domain smoothing algorithm
As a result s (n) is updated：
S (n+1)=(1- λ) s (n)+λ c (n),
In formula λ be a constant, typical value 0.01.
A kind of active noise reduction control method for being capable of acoustics interaction provided by the invention, has low voice speaking playing function --- user
Source of sound input signal is provided using external voice-operated device 7, playing user by loud speaker 2 it is expected the audio heard；And array
Sound perceptional function --- array is formed by multiple error pick-ups, the control voice that human hair goes out is perceived, and is sent to external sound
Control equipment 7；Active noise control and echo cancelltion control organic combination has been subjected to simultaneously.Wherein Active noise control uses
Feed forward architecture and algorithm can inhibit the air pipeline noise at error microphone 4, the array pickup for forming error microphone 4
It is subject to low frequency noises smaller during room acoustics signal (control voice that i.e. human hair goes out)；Meanwhile in external 7 sound of voice-operated device
Source input carry out it is indoor it is low voice speaking put in the case of, using the intermediate parameters of the adaptive algorithm of echo cancelltion, to secondary channel model
103 parameters into Mobile state, in real time adjustment, realize loud speaker 2 to 4 physical channel models of error microphone in real time more
Newly, so as to improving the stability of active noise reduction system and noise reduction.Further, since ventilation nozzle is normally at indoor ceiling
Middle part, at this time by the array that error microphone 4 is formed by it is less be subject to indoor furniture and mobile object caused by sound
Reflection, the influence of scattering, promote the accuracy of acoustic signal pickup, promote the comfort level of acoustics interactive product.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made directly or indirectly is used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (6)
1. it is arranged on ventilation nozzle and is capable of the active noise reducing device of acoustics interaction, it is characterised in that：It is raised including a housing (1), one
Sound device (2), one are with reference to microphone (3), a plurality of error microphones (4), a controller (5) and an air diffuser (6)；The shell
A first through hole (11) is opened up on the bottom surface of body (1), one second through hole (12) is opened up at the top of the housing (1)；It is described to raise one's voice
Device (2) is arranged in the housing (1), and its cone (21) is outwardly and in the first through hole (11), the housing (1) with
The inner space that the loud speaker (2) surrounds forms the back cavity of the loud speaker (2)；The reference microphone (3) is arranged on described
On second through hole (12) and it is described with reference to microphone (3) acoustics input terminal towards the housing (1) outside；Each error
Microphone (4) on the bottom surface of the housing (1) and is provided close to the position of the bottom edge, and each error is transaudient
The acoustics input terminal of device (4) is towards the outside of the housing (1)；The controller (5) is arranged in the housing (1), described
Loud speaker (2) is connected to the controller (5) with reference to microphone (3) and each error microphone (4) lead；The diffusing
The center of device (6) opens up a third through-hole (61), and the bottom surface of the housing (1) is arranged in the third through-hole (61), will
When the air diffuser (6) is installed on ventilation nozzle, the housing (1) is equipped with the one side conduct inside with reference to microphone (3), if
In the inside of the ventilation nozzle, the bottom surface of the housing (1) is used as outside, arranged on the ventilation nozzle, makes the loud speaker
(2) directly to indoor sounding.
2. the active noise reducing device for being arranged on ventilation nozzle and being capable of acoustics interaction according to claim (1), feature exist
In：The controller (5) includes a wireless communication module (51) and an A/D converter connected in sequence (52), a number letter
Number processor (53), a D/A converter (54) and a power amplifier (55), external voice-operated device (7) pass through the channel radio
Believe that module (51) carries out two-way communication with the digital signal processor (53), the A/D converter (52) gathers the reference
The output signal of microphone (3) and each error microphone (4), the D/A converter (54) will need loud speaker (2) to play
Signal output to the power amplifier (55), the power amplifier (55) connects the loud speaker (2).
3. a kind of active noise reducing device with acoustics interactive function according to claim 1, it is characterised in that：It further includes
One sound-absorbing material layer (8), in addition to the bottom surface of the housing (1), the outer surface of the housing (1) is equipped with the sound-absorbing material layer
(8), including the outside with reference to microphone (3), the sound-absorbing material layer (8) is dropped simultaneously for increasing passive noise reduction
The low wind with reference to microphone (3) is made an uproar.
4. a kind of active noise reducing device with acoustics interactive function according to claim 1, it is characterised in that：The shell
Body (1) is conical shell, and second through hole (12) is opened in the top of the conical shell, described close with reference to microphone (3)
Envelope is installed on second through hole (12).
5. a kind of active noise reduction control method for being capable of acoustics interaction, which is characterized in that it combines described in claim 1 active
Denoising device, the acoustical signal picked up with reference to microphone (3) in ventilation shaft, including the raw noise letter inside pipeline
Number, the sound of the reverse phase noise signal that is sent by loud speaker (2) and external voice-operated device (7) input played by loud speaker (2)
Frequency signal；The acoustical signal that the error microphone (4) is picked up includes：By pipeline internal communication Lai original noise and
Residual noise signal that the reverse phase noise signal that loud speaker (2) is sent is formed by stacking, the external acoustic control played by loud speaker (2) are set
The control voice that the audio signal and human hair of standby (7) input go out；It is equipped in the digital signal processor (53) and runs simultaneously
For handling the software module of acoustical signal, including the increasing of a noise reduction module (100), an echo cancellation module (200) and a noise reduction
Strong module (300), in processing noise reduction and acoustics interaction, the noise reduction module (100), echo cancellation module (200) and
Noise reduction enhancing module (300) is run simultaneously, in no particular order order；
The control method is specific as follows：
The low frequency radiation noise for inhibiting to generate in ventilation shaft by the noise reduction module (100)：Noise reduction module (100) bag
Include noise filter (101), acoustic feedback path model (102), secondary channel model (103) and filter update algoritic module
(104)；The noise filter (101) will export identical with raw noise amplitude after the raw noise filtering process inside pipeline
But the reverse phase noise of opposite in phase, the reverse phase noise are made after being superimposed with the audio signal that the external voice-operated device (7) inputs
For the output signal of the noise reduction module (100), the loud speaker (2) is driven, while is also used as the acoustic feedback path model
(102) input；The output signal of the noise reduction module (100) negates after the acoustic feedback path model (102) filters,
It is overlapped again with the acoustical signal picked up with reference to microphone (3), described picked up with reference to microphone (3) is eliminated after superposition and is arrived
The reverse phase noise signal sent by loud speaker (2) and by loud speaker (2) play external voice-operated device (7) input audio letter
Number, the raw noise inside only remaining pipeline, using the raw noise as the input of the noise filter (101), meanwhile, institute
Input of the raw noise also as the secondary channel model (103) is stated, the raw noise passes through the secondary channel model
(103) input after filtering as the filter update algoritic module (104)；
The control voice gone out by the echo cancellation module (200) acquisition human hair：The echo cancellation module (200) includes multiple
Several submodules, the submodule are corresponded with the error microphone (4) and set, and each submodule is filtered including an echo cancelltion
Ripple device (201) and an adaptive algorithm module (202)；The input of the echo cancellation filter (201) is external voice-operated device
(7) audio signal of input, negates after being filtered, then the acoustical signal picked up with the error microphone (4) is overlapped,
Output signal of the signal as the submodule after the superposition, the output signal of the submodule are eliminated by the loud speaker
(2) audio signal of external voice-operated device (7) input played, but the control voice including people, by the output of the submodule
Signal is sent to external voice-operated device (7) by wireless communication module (51), passes through with reference to external voice-operated device (7) described wireless
The audio signal of communication module (51) input realizes acoustics interaction；Meanwhile the output signal of the submodule also as it is described from
The input of adaptation algorithm block (202) and the input of the filter update algoritic module (104), the adaptive algorithm module
(202) input further includes the audio signal of external voice-operated device (7) input, and adaptive algorithm module (202) output is used
In the parameter for updating the echo cancellation filter (201), the adaptive algorithm module (202) is according to external voice-operated device
(7) the output signal of the audio signal of input and submodule, adaptively adjusts the parameter of echo cancellation filter (201)
Whole, the purpose is to preferably eliminate the external voice-operated device (7) played by the loud speaker (2) of error microphone (4) pickup
The audio signal of input；
Output signal and each time of the input of the filter update algoritic module (104) including secondary channel model (103)
Sound offsets the superposition of the output signal of submodule, and the output of the filter update algoritic module (104) is for the noise reduction
The coefficient of wave filter (101) is adaptively adjusted, and the purpose is to preferably inhibit the residual noise of error microphone (4) pickup
Signal, so as to fulfill more preferably active noise reduction effect；
The input of the noise reduction enhancing module (300) is the parameter of each echo cancellation filter (201), the noise reduction enhancing
Module (300) by the parameter of each echo cancellation filter (201) be overlapped and time domain it is smooth after, result is as secondary logical
The new parameter of road model (103) realizes the real-time update of secondary channel model (103).
6. a kind of active noise reduction control method for being capable of acoustics interaction according to claim 5, it is characterised in that：The drop
Wave filter (101), acoustic feedback path model (102), secondary channel model (103) and echo cancellation filter (201) make an uproar
Using FIR filter, wherein the secondary channel model（103）With the echo cancellation filter（201）With identical rank
It is secondary.
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