CN110401902A - A kind of active noise reduction system and method - Google Patents
A kind of active noise reduction system and method Download PDFInfo
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- CN110401902A CN110401902A CN201910715187.6A CN201910715187A CN110401902A CN 110401902 A CN110401902 A CN 110401902A CN 201910715187 A CN201910715187 A CN 201910715187A CN 110401902 A CN110401902 A CN 110401902A
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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
- H04R5/00—Stereophonic arrangements
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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
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of active noise reduction system, it include: noise collection module, loudspeaker module and the range finder module of multiple groups, wherein, every group of noise collection module, loudspeaker module and range finder module is set to the one of a plurality of areas that place to be measured delimited in advance, the noise collection module of the group, for acquiring ambient noise, and form noise signal；The loudspeaker module of the group, for generating and playing the noise with the noise signal reverse phase of the noise collection module collection of the group；The range finder module of the group, for acquiring the realtime graphic of people in place to be measured, identifying the position of people and calculating the real-time range between the loudspeaker module and people；One analysis module, for analyzing the noise of the noise collection module of each group and the range information of range finder module；One control module, the information for being inputted according to analysis module control the loudspeaker module and send reverse phase noise.
Description
Technical field
The present invention relates to living environment field more particularly to a kind of active noise reduction systems.
Background technique
With the improvement of living standards, requirement of the people to living environment is higher and higher, not only require living space whole
It is clean, completely, also living environment is required not have noise pollution.Allow noise criteria according to the Indoor Residential Ecological that the Ministry of Construction formulates, crouches
The noise limitation of room, study is 45 decibels of highest, 35 decibels of night highest of daytime.But environmental protection administration is not in this, as law enforcement
Foundation.Reason is that the standard is not that environmental protection administration formulates.Room noise cannot be divided into five classes as outdoor noise, can only
Fixed a kind of or two classes just can ensure that resident lives to obtain peace because interior should be a quiet environment for outdoor
The heart is comfortable.Therefore, 10 decibels are reduced room noise standard or on outdoor 0 class standard, daytime 40 decibels of highest, night highest
30 decibels.But for ordinary people, the bedroom inhabited lower than above-mentioned standard is still difficult to fall asleep, particularly with old man and
Children.
For houses facing the street, bustling with vehicles on road is that one day of indoor life is perplexed, it is desirable to good room
Interior environment, many people take passively noise reduction measure, for example use the window with very strong soundproof effect, hang around window
Green plant of noise reduction effect etc. is played in curtain with soundproof effect, placement.But these measures can only passively reduce the dirt of noise
Dye, cannot be completely eliminated noise.For being closer for resident from large scale electrical power unit or rotating machinery, noise is general
Higher than requirements of the national standard, while building structure can also be generated many low frequency noises by external device excitation, these noises
It is difficult to play a role using above-mentioned soundproof measures, many old men can not fall asleep, and complain incessantly to this.
In order to initiatively eliminate noise, people have invented " Active Noise Control " this technology.Its principle is: all sound
Sound is all made of certain frequency spectrum, if a kind of sound can be found, frequency spectrum and the noise to be eliminated are just the same, only
It is that phase is just opposite (180 ° of difference), so that it may be completely counterbalanced by this noise.Key is that how to obtain that counteracting makes an uproar
The sound of sound.The method actually used is: setting about from noise source itself, tries to fall the phase of former noise by electronic circuit
Come over.From this, this technology of Active Noise Control actually " is combatted poison with poison ".The above method has been widely used at present
Automobile, earphone etc. are mainly used for reducing fixed point, the noise under fixed environment.
Three steps of current active noise reduction techniques principle point: firstly, microphone hears noise；Then, it is analyzed by control circuit
Noise characteristic, order loudspeaker generates one and noise is equal in magnitude, 180 degree of phase difference of sound wave；Finally, the sound wave of generation
Being superimposed with noise offsets the two just completely.From the point of view of the realization of decrease of noise functions, active noise reduction is divided into feedforward, feedback, compound
Three kinds of forms of formula (feedforward+feedback).If from the point of view of taking active noise reduction earphone, the realization of feedforward needs on the outside of the earphone enclosure of two sides
A microphone is respectively put, feedback is then that a microphone is respectively placed on the inside of the earphone enclosure of two sides, and combined type is then each inside and outside earmuff
One, i.e., entire four Mikes of earphone.Only from the point of view of noise reduction effect, the effect of combined type noise reduction is centainly better than single feedforward or single
The noise reduction effect of feedback, but its cost and technology realize also can it is higher, be more difficult.
But large space this for bedroom, multiple activation factor, complicated audience environment, there are no a kind of particularly good
Method carries out noise reduction.
Summary of the invention
(1) technical problems to be solved
The invention proposes a kind of active noise reduction system and methods, at least partly to solve the problem above-mentioned:
(2) technical solution
According to an aspect of the present invention, a kind of active noise reduction system is provided, comprising: the noise collection module of multiple groups is raised
Sound device module and range finder module, wherein every group of noise collection module, loudspeaker module and range finder module is set to field to be measured
The one of a plurality of areas that ground delimited in advance, the noise collection module of the group, for acquiring ambient noise, and forms noise
Signal；The loudspeaker module of the group, for generating and playing and the noise signal reverse phase of the noise collection module collection of the group
Noise；The range finder module of the group is identified and is raised described in the position of people and calculating for acquiring the realtime graphic of people in place to be measured
Real-time range between sound device module and people；One analysis module, for analyzing noise and the ranging of the noise collection module of each group
The range information of module；One control module, the information for being inputted according to analysis module control the loudspeaker module and send instead
Phase noise.
In further embodiment, the loudspeaker module a, comprising: DSP unit is electrically connected with the control module
It connects, for generating reverse phase noise；One power amplifier, for the reverse phase noise to be pressed setting power amplification；Multiple loudspeakers,
It is electrically connected with the power amplifier, for the reversed noise after playing hair greatly, wherein using FXLMS in the DSP unit
(Filtered-X Least-Mean-Square, feedforward X- filter least mean square algorithm) algorithm is generated with the noise with frequency
Reversed digital signal, the FXLMS algorithm is in basic LMS (Least-Mean-Square, least mean square algorithm) algorithm
On the basis of increase the influence of secondary channel, the secondary channel includes digital analog converter in loudspeaker module, reconstruct
Filter, power amplifier, loudspeaker to the channel between microphone apparatus, preposition amplification, frequency overlapped-resistable filter and modulus turn
Parallel operation.
In further embodiment, a noise threshold is set in the analysis module, when the noise collection module is defeated
When the power noise entered is greater than the threshold value, then start analytic process, conversely, then entering standby mode.
In further embodiment, the control module, analysis module, noise collection module, loudspeaker module and ranging
Module is connected by Ethernet and is worked in same network segment.
According to another aspect of the present invention, a kind of method of active noise reduction is provided, comprising:
Place to be measured is divided into region by setting quantity, a noise collection module, a range finder module and one are placed in every region
Loudspeaker module；
The realtime graphic of people in range finder module pickup area, identify the position of the people and measure loudspeaker and human ear it
Between real-time range；
Noise information in noise collection module collection region；
Range information in one's respective area and noise information are transferred to analysis module by range finder module and noise collection module；
Analysis module is for analyzing each region measurement result, after the real time data for obtaining people, calculates and obtains loudspeaking
The sound wave that device generates passes to the first time information in human ear, and transmits this information to control system；
Control system is that each region calculates corresponding reverse phase noise signal, is separately sent to broadcast with field speaker module
It puts, offsets the noise, achieve the purpose that noise reduction.
In further embodiment, in noise collection module collection region noise information include the frequency of noise, phase and
Power.
In further embodiment, analysis module first determines whether that noise is for analyzing each region measurement result
No is more than preset noise threshold, starts analytic process if being more than.
(3) beneficial effect
The present invention utilizes the principle of multiple spot subregion, and place to be measured is divided into setting regions, ranging is installed in zone corner
Module, noise collection module and loudspeaker module generate reverse phase noise signal corresponding with noise, form a stereo-circulation
Voice signal, it is exactly big when passing to voice signal that outside noise in human ear and loudspeaker issue in this way at human ear
Small equal, opposite in phase can cancel out each other, and realize preferable noise reduction effect, effectively realize active noise reduction.
Meanwhile the invention avoids one group of noise reduction module in the prior art, because position of the people in region is different, raise
The voice signal that sound device issues and outside noise pass to the difference of the path in human ear, then the phase of voice signal and noise is not
It is exactly the opposite, the problem of causing noise to increase.
In addition, the present invention can measure the noise size for passing to entire room, analyze and determine noise whether be more than
Preset noise figure avoids noise and is not enough to bother people in room if noise is more than that limit value can open noise reduction system
The unlatching of noise reduction system when movable, prevents the waste of resource.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of active noise reduction system of the embodiment of the present invention.
Fig. 2 is the flow chart of the active denoising method of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and join
According to attached drawing, the present invention is described in further detail.
In the present invention, " on being set to ... " or " on being pasted to ... " is for including and single or multiple inter-module
Direct contact relation.Moreover, ordinal number used in specification and claims for example " first ", " second ", " No.1 " or
Words such as " No. two ", to modify claimed component, itself and do not include and represent the component have it is any before sequence
The use of number, the sequence or the sequence in manufacturing method for also not representing a certain component and another component, these ordinal numbers is only used to
The component with certain name is set to be able to make clear differentiation with another component with identical name.
Large space this for bedroom, multiple activation factor, complicated audience environment, there are no a kind of particularly good sides
Method carries out noise reduction.When because of people being activity in a room, if room only has one group of noise reduction module, with the position of people in the room
It sets and constantly changes, the voice signal that microphone issues and outside noise pass to the difference of the path in human ear, pass to people in this way
The phase of voice signal and noise in ear be not it is exactly the opposite, so as to increase noise, be unable to reach except denoising
Purpose but the acoustic phase that noise and loudspeaker can be allowed to issue be not it is exactly the opposite, can not just offset noise, or even can
It can increase the intensity of noise, the method for this Active Noise Control will be made to have a greatly reduced quality.For this purpose, the present invention is based on multiple spot subregion originals
Reason, devises living environment active noise reduction system and method with good noise reduction effect, makes tribute to improve living environment
It offers.
The embodiment of the invention discloses a kind of active noise reduction system, Fig. 1 is a kind of active noise reduction system of the embodiment of the present invention
Functional block diagram, as shown in Figure 1, comprising: noise collection module, loudspeaker module and the range finder module of multiple groups, wherein every group
Noise collection module, loudspeaker module and range finder module be set to the one of a plurality of areas that place to be measured delimited in advance,
The noise collection module of the group, for acquiring ambient noise, and forms noise signal, in the present embodiment, each noise collection
Module can acquire ambient noise using the opposite microphone of both direction in real time, and output noise signal is to analysis module,
The noise signal size of output is able to reflect the size of noise in place to be measured；The loudspeaker module of the group, for generating and broadcasting
Put the noise with the noise signal reverse phase of the noise collection module collection of the group；The range finder module of the group, for acquiring field to be measured
The realtime graphic of people in ground identifies the position of people and calculates the real-time range between the loudspeaker module and people；One analysis mould
Block, for analyzing the noise of the noise collection module of each group and the range information of range finder module, in the present embodiment, the analysis
Module compares the noise size that noise collection module exports with preset noise threshold, when ambient noise is larger, output
When noise size is greater than noise threshold, noise reduction switch circuit is connected at this time, and active noise reduction equipment is started to work, to be measured to realize
Noise reduction in place；When ambient noise is smaller, noise reduction switch circuit cut-off, active noise reduction equipment stops working, therefore, passes through
Noise collection module and analysis module can control the work or stopping of active noise reduction equipment, in turn according to the size of noise
It can not only realize and realize active noise reduction under larger noise circumstance, also can close active noise reduction under the lesser environment of noise and set
It is standby to save electric power resource, further more, the real time running number that analysis module can be moved with people in place to be measured according to this distance
It obtains the sound wave that different loudspeaker generates according to calculating and passes to the first time information in human ear, it, can be with according to its temporal information
It sends the corresponding noise signal of generation at corresponding loudspeaker module and plays, since every group of loudspeaker is at a distance from people
The phase of difference, the reverse phase noise signal of generation would also vary from；One control module, for what is inputted according to analysis module
Information controls the loudspeaker module and sends reverse phase noise.
Wherein, the loudspeaker module a, comprising: DSP unit is electrically connected with the control module, anti-for generating
Phase noise, each DSP unit convert reversed noisy digit signal for noise audio signal after being computed and input corresponding function
Electric discharge road, in an exemplary embodiment of the invention, the output end of control module is connected with four DSP units, and DSP unit counts
Word signal processing unit, burning FXLMS algorithm routine in DSP unit, utilizes the simple plane filtered audio signal of this algorithm process
Generate the digital signal reversed with frequency；The FXLMS algorithm considers secondary channel on the basis of basic LMS algorithm
S (z) influence, specific secondary channel includes digital analog converter, reconfigurable filter, power amplifier in loudspeaker, loudspeaking
Device is to the channel between microphone apparatus, preposition amplification, frequency overlapped-resistable filter and analog-digital converter；One power amplifier, is used for
By the reverse phase noise by setting power amplification；Multiple loudspeakers are electrically connected with the power amplifier, after playing hair greatly
Reversed noise.
In an exemplary embodiment of the invention, place to be measured is divided into four pieces of regions, disposes one in the corner in each region
Range finder module, a noise collection module, a loudspeaker module, wherein each loudspeaker module includes a DSP unit, a power amplifier
Circuit and two loudspeakers, in addition, the analysis module and control module can be deployed in place anywhere or place
Outside.
In the present embodiment, the control module, analysis module, noise collection module, loudspeaker module and range finder module
It is connected and is worked in same network segment by Ethernet.
The embodiment of the invention also provides the active denoising methods of the application system, and Fig. 2 is the active of the embodiment of the present invention
The flow chart of noise-reduction method, as shown in Figure 2, comprising:
Place to be measured is divided into region by setting quantity, a noise collection module, a range finder module and one are placed in every region
Loudspeaker module；In an exemplary embodiment of the invention, place to be measured is divided into four pieces of regions, the corner in each region
Affix one's name to a range finder module, a noise collection module, a loudspeaker module, wherein each loudspeaker module include a DSP unit, one
Power amplifier and two loudspeakers, in addition, the analysis module and control module can be deployed in place anywhere or
Outside place；
With the continuous variation of the position of people, the realtime graphic that four groups of range finder module acquisition people take action in the venue can be known
Others' position and measure four groups of real-time ranges between loudspeaker and human ear；
Four groups of noise collection modules being distributed in the corner of place measure extraneous pass for the noise collection inside place
The noise of different location inside to place；
Measurement result is transferred to analysis module by four groups of range finder modules and noise collection module, and analysis module is used for four
The different measurement result of group is analyzed, and judges whether noise is more than preset noise threshold, will be opened this if being more than and is
System；After obtaining the movable real time data of people simultaneously, when the sound wave that calculating obtains the generation of four groups of loudspeakers passes to first in human ear
Between information；
The first time information that the noise data and range finder module that control module is inputted according to noise collection module generate,
Four groups of corresponding reverse phase noise signals are generated, is separately sent to play at corresponding loudspeaker module, can thus form one
The voice signal of a stereo-circulation；When the voice signal that the outside noise and loudspeaker passed in human ear issues is at human ear just
It is equal in magnitude, opposite in phase well, can cancels out each other, realizes preferable noise reduction effect, effectively realize active noise reduction.
When existing simultaneously multiple people in certain region in place to be measured, optical ranging system can be identified and be acquired more
The realtime graphic that individual takes action in place to be measured, according to everyone position between different people and loudspeaker it is real-time away from
From measuring.Analysis module and control module can be according to different distances, preferential two groups selected apart from everyone recently
Noise reduction system and two groups of farthest systems are used to noise reduction, in order to reach better noise reduction effect, can be arranged more than the place to be measured
Several groups of noise reduction systems, in order to avoid noise reduction effect is influenced when people is more.
By above statement, aiming at the problems existing in the prior art and disadvantage, the embodiment of the invention provides a kind of masters
The active denoising method of dynamic noise reduction system and the application system, the present invention utilize the principle of multiple spot subregion, place to be measured are divided into
Setting regions installs range finder module, noise collection module and loudspeaker module in zone corner, generates corresponding with noise
Reverse phase noise signal forms the voice signal of a stereo-circulation, and the outside noise and loudspeaker passed in human ear in this way issues
Voice signal at human ear when exactly equal in magnitude, opposite in phase, can cancel out each other, realize preferable noise reduction effect
Fruit effectively realizes active noise reduction.Meanwhile the invention avoids one group of noise reduction modules in the prior art, because people is in region
Position it is different, the voice signal and outside noise that loudspeaker issues pass to the difference of the path in human ear, then voice signal and make an uproar
The phase of sound is not exactly the opposite, the problem of causing noise to increase.In addition, the present invention can be to passing to entire place to be measured
Noise size measures, and analyzes and determines whether noise is more than preset noise figure, if noise is more than that limit value can open drop
It makes an uproar system, avoids the unlatching of noise reduction system when noise is not enough to bother people's activity in place to be measured, prevent the wave of resource
Take.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of active noise reduction system, comprising:
Noise collection module, loudspeaker module and the range finder module of multiple groups, wherein every group of noise collection module, loudspeaker mould
Block and range finder module are set to the one of a plurality of areas that place to be measured delimited in advance, and the noise collection module of the group is used for
Ambient noise is acquired, and forms noise signal；The loudspeaker module of the group, for generating and playing the noise collection mould with the group
The noise for the noise signal reverse phase that block is collected；The range finder module of the group is identified for acquiring the realtime graphic of people in place to be measured
The position of people simultaneously calculates the real-time range between the loudspeaker module and people；
One analysis module, for analyzing the noise of the noise collection module of each group and the range information of range finder module；
One control module, the information for being inputted according to analysis module control the loudspeaker module and send reverse phase noise.
2. system according to claim 1, wherein the loudspeaker module, comprising:
One DSP unit is electrically connected with the control module, for generating reverse phase noise；
One power amplifier, for the reverse phase noise to be pressed setting power amplification；
Multiple loudspeakers are electrically connected with the power amplifier, for the reversed noise after playing hair greatly.
3. system according to claim 1 a, wherein noise threshold is set in the analysis module, when the noise is received
When collecting the power noise of module input greater than the threshold value, then start analytic process.
4. system according to claim 1, the noise collection module collection information includes the frequency, phase and function of noise
Rate.
5. system according to claim 2, wherein same with the noise using the generation of FXLMS algorithm in the DSP unit
Frequently reversed digital signal.
6. system according to claim 5, wherein the FXLMS algorithm increases secondary lead on the basis of LMS algorithm
The influence in road, the secondary channel include digital analog converter, reconfigurable filter, power amplifier in loudspeaker module, loudspeaker
To the channel between microphone apparatus, preposition amplification, frequency overlapped-resistable filter and analog-digital converter.
7. system according to claim 2, wherein the control module, analysis module, noise collection module, loudspeaker
Module is connected by Ethernet with range finder module and is worked in same network segment.
8. a kind of active denoising method using system as claimed in claim 1 to 7, comprising:
Place to be measured is divided into region by setting quantity, a noise collection module, a range finder module and a loudspeaking are placed in every region
Device module；
The realtime graphic of people in range finder module pickup area identifies the position of the people and measures the reality between loudspeaker and human ear
When distance；
Noise information in noise collection module collection region；
Range information in one's respective area and noise information are transferred to analysis module by range finder module and noise collection module；
Analysis module is for analyzing each region measurement result, after the real time data for obtaining people, calculates and obtains loudspeaker production
Raw sound wave passes to the first time information in human ear, and transmits this information to control system；
Control system is that each region calculates corresponding reverse phase noise signal, is separately sent to play with field speaker module.
9. according to the method described in claim 8, wherein, noise information includes the frequency of noise in noise collection module collection region
Rate, phase and power.
10. according to the method described in claim 8, wherein, analysis module is for analyzing each region measurement result, first
Judge whether noise is more than preset noise threshold, starts analytic process if being more than.
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| CN111447531A (en) * | 2019-12-31 | 2020-07-24 | 江门市赛科环保科技有限公司 | Electronic silencing treatment method in free space |
| CN111583898A (en) * | 2020-05-26 | 2020-08-25 | 舒伟伟 | Space environment multi-directional selective noise reduction system and method |
| CN111899710A (en) * | 2020-07-10 | 2020-11-06 | 广东电网有限责任公司 | Method and device for actively reducing noise of power distribution room based on analytic hierarchy process |
| CN112053677A (en) * | 2020-08-18 | 2020-12-08 | 华帝股份有限公司 | Noise reduction method and range hood applying same |
| CN112235675A (en) * | 2020-09-29 | 2021-01-15 | 海菲曼（天津）科技有限公司 | Active noise reduction method and chip of earphone |
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