CN106303783A - Noise-reduction method and device - Google Patents
Noise-reduction method and device Download PDFInfo
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- CN106303783A CN106303783A CN201610665574.XA CN201610665574A CN106303783A CN 106303783 A CN106303783 A CN 106303783A CN 201610665574 A CN201610665574 A CN 201610665574A CN 106303783 A CN106303783 A CN 106303783A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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Abstract
The invention provides a kind of noise-reduction method and device.Wherein, the method includes: gather ambient noise signal；The inversion signal of build environment noise signal；Play inversion signal, to realize the noise reduction to ambient noise signal.By the present invention, solve the problem that environment noise is difficult to eliminate, it is achieved that the noise reduction of environment noise.
Description
Technical field
The present invention relates to noise reduction field, in particular to a kind of noise-reduction method and device.
Background technology
Noise, also referred to as noise, be that Man & Nature circle allowing and hearing it bring worry, unwelcome sound.Affect people
Work and study have a rest sound be referred to as noise.Noise is experienced different because of each one sensation, custom etc., therefore noise
Sometimes it is a subjective impression.In general the ambient sound of the talk or thinking that affect people is referred to as noise by people.
Although the earphone products that we use is more and more high-grade, the quality enjoying music is more and more higher, but only must not
It is not recognised that the sound pollution in city is increasingly severe, at outdoor application common headphones earplug, volume can only be improved and covered
Noise, the most not only can not enjoy beautiful music, also have a great impact the audition of oneself, and perhaps you will soon
Feel auditory fatigue.A lot of Portable earphones are increasingly in view of the problem of sound insulation, but are the way cured the symptoms, not the disease after all,
What music was after all intended to " to enjoy " together with a lot of noises listened in the external world.
Summary of the invention
The invention provides a kind of noise-reduction method and device, at least to solve what environment noise in correlation technique was difficult to eliminate
Problem.
According to an aspect of the invention, it is provided a kind of noise-reduction method, including: gather ambient noise signal；Generate institute
State the inversion signal of ambient noise signal；Play described inversion signal, to realize the noise reduction to described ambient noise signal.
Alternatively, the inversion signal generating described ambient noise signal includes: by described ambient noise signal and noise sample
Default noise sample in this storehouse carries out aspect ratio pair, filters out and one of described ambient noise signal characteristic matching or many
Individual noise sample；According to one or more noise sample, generate the inversion signal of described ambient noise signal.
Alternatively, described ambient noise signal and described default noise sample are being carried out aspect ratio to before, described side
Method also includes: by mike acquisition noise sample or receive noise sample by data-interface；Noise sample is stored to
Described noise sample storehouse.
Alternatively, described ambient noise signal is being carried out aspect ratio to it with the default noise sample in noise sample storehouse
Before, described method also includes: select some or all of noise sample as described default noise from described noise sample storehouse
Sample.
Alternatively, according to one or more noise sample, the inversion signal bag of described ambient noise signal is generated
Include: directly generate and the opposite in phase of one or more noise sample identical with the amplitude of described ambient noise signal
The inversion signal of described ambient noise signal；Or store to have in described noise sample storehouse and make an uproar with one or more
In the case of one or more inversion signal sample that sound sample is corresponding, read one or more inversion signal sample
And adjust the amplitude of one or more inversion signal sample, obtain the inversion signal of described ambient noise signal.
According to another aspect of the present invention, additionally provide a kind of denoising device, including: acquisition module, it is used for gathering ring
Border noise signal；Generation module, for generating the inversion signal of described ambient noise signal；Noise reduction module, is used for playing described
Inversion signal, to realize the noise reduction to described ambient noise signal.
Alternatively, generation module includes: screening unit, for by pre-with noise sample storehouse of described ambient noise signal
If noise sample carries out aspect ratio pair, filter out one or more noise sample with described ambient noise signal characteristic matching
This；Signal generating unit, for according to one or more noise sample, generates the inversion signal of described ambient noise signal.
Alternatively, described device also includes: acquisition module, is used for by mike acquisition noise sample or passes through data
Interface noise sample；Memory module, for storing noise sample to described noise sample storehouse.
Alternatively, described device also includes: select module, some or all of for selecting from described noise sample storehouse
Noise sample is as described default noise sample.
Alternatively, signal generating unit includes: first generates subelement, for directly generating and the width of described ambient noise signal
Spend the inversion signal of the described ambient noise signal of the opposite in phase of identical and one or more noise sample；Or
Second generates subelement, has corresponding with one or more noise sample for storage in described noise sample storehouse
In the case of individual or multiple inversion signal sample, read one or more inversion signal sample and also adjust one
Or the amplitude of multiple inversion signal samples, obtains the inversion signal of described ambient noise signal.
By the present invention, use and gather ambient noise signal；The inversion signal of build environment noise signal；Play anti-phase letter
Number, in the way of realizing the noise reduction to ambient noise signal, solve the problem that environment noise is difficult to eliminate, it is achieved that environment is made an uproar
The noise reduction of sound.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of noise-reduction method according to embodiments of the present invention；
Fig. 2 is the schematic diagram one of noise-reduction method according to embodiments of the present invention；
Fig. 3 is the schematic diagram two of noise-reduction method according to embodiments of the present invention；
Fig. 4 is the structured flowchart of denoising device according to embodiments of the present invention；
Fig. 5 is the structural representation of denoising device according to the preferred embodiment of the invention.
Detailed description of the invention
Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " it is etc. for distinguishing similar object, without being used for describing specific order or precedence.
Providing a kind of noise-reduction method in the present embodiment, Fig. 1 is the flow process of noise-reduction method according to embodiments of the present invention
Figure, as it is shown in figure 1, this flow process comprises the steps:
Step S101, gathers ambient noise signal；
Step S102, the inversion signal of build environment noise signal；
Step S103, plays inversion signal, to realize the noise reduction to ambient noise signal.
By above-mentioned steps, owing to the propagation of sound is that the vibration by medium realizes, if in instead between ripple and ripple
Xiang Zehui realizes offsetting under academic conditions.This cancels out each other a road like the wave of two groups of different directions in tranquil lake
Reason.Therefore, broadcasting and the inversion signal of the opposite in phase of ambient noise signal, then can balance out environment in whole or in part and make an uproar
Acoustical signal.Visible, by the present invention, solve the problem that environment noise is difficult to eliminate, it is achieved that the noise reduction of environment noise.
In embodiments of the present invention, gather ambient noise signal and use pick up (i.e. mike), generate inversion signal and adopt
Use high speed processing chip, play inversion signal and use high-fidelity loudspeaker (or the highest reduction degree speaker).
Fig. 2 is the schematic diagram one of noise-reduction method according to embodiments of the present invention, as in figure 2 it is shown, collect environment noise letter
After number, generate the antipodal inversion signal of phase place with this ambient noise signal, and play this inversion signal.According to relevant
Waveform conversion in technology understands, and any one analogue signal can be decomposed into the folded of multiple sinusoidal signal and/or cosine signal
Add；Therefore, obtaining after ambient noise signal, ambient noise signal is decomposed into multiple just/cosine signal, and be each
Just/cosine signal generate phase 180 ° inversion signal (in actual signal processing procedure, be equivalent to each just/remaining
String signal respectively in advance or the phase place of delayed 180 °), keep simultaneously corresponding just/amplitude of cosine signal and its inversion signal
Identical, then can be completely counterbalanced by environment noise.
Fig. 3 is the schematic diagram two of noise-reduction method according to embodiments of the present invention, as it is shown on figure 3, alternatively, build environment is made an uproar
During the inversion signal of acoustical signal, it is also possible to ambient noise signal is carried out aspect ratio with the default noise sample in noise sample storehouse
Right, filter out one or more noise sample with ambient noise signal characteristic matching；According to one or more noise sample
This, the inversion signal of build environment noise signal.By which, specific ambient noise signal can be carried out noise reduction.
Alternatively, ambient noise signal and default noise sample are being carried out aspect ratio to before, mike can passed through
Acquisition noise sample or receive noise sample by data-interface；Noise sample is stored to noise sample storehouse.Wherein, data
Interface includes but not limited to: wired data interface or wireless data interface.By the way of mike acquisition noise sample, suitable
For the ambient noise-reduction of the most fixing scene, such as, it is positioned under the scene that road is other, by gathering the noise of automobile engine
Sample, it is possible to realize the accurate noise reduction of automobile engine noise.
Alternatively, the default noise sample in ambient noise signal and noise sample storehouse is being carried out aspect ratio to before,
Some or all of noise sample can also be selected from noise sample storehouse as default noise sample.By which, user
Can need which noise is carried out noise reduction from main separation.
Alternatively, the inversion signal of ambient noise signal can be to generate in real time, can be in advance with noise sample pair
Should be stored in noise sample storehouse.Now, according to one or more noise sample, the anti-phase letter of build environment noise signal
Number time, the opposite in phase of and one or more noise sample identical with the amplitude of ambient noise signal can be directly generated
The inversion signal of ambient noise signal；Or storage has corresponding with one or more noise sample in noise sample storehouse
In the case of individual or multiple inversion signal sample, it is also possible to read one or more inversion signal sample and adjust one or
The amplitude of person's multiple inversion signal sample, obtains the inversion signal of ambient noise signal.Wherein, environment noise sample is prestored
Inversion signal, the formation efficiency of inversion signal can be improved, i.e. when generating, it is only necessary to adjust the amplitude of inversion signal i.e.
Can.
Through the above description of the embodiments, those skilled in the art is it can be understood that arrive according to above-mentioned enforcement
The method of example can add the mode of required general hardware platform by software and realize, naturally it is also possible to by hardware, but a lot
In the case of the former is more preferably embodiment.Based on such understanding, technical scheme is the most in other words to existing
The part that technology contributes can embody with the form of software product, and this computer software product is stored in a storage
In medium (such as ROM/RAM, magnetic disc, CD), including some instructions with so that a station terminal equipment (can be mobile phone, calculate
Machine, server, or the network equipment etc.) perform the method described in each embodiment of the present invention.
Additionally providing a kind of denoising device in the present embodiment, this device is used for realizing above-described embodiment and the side of being preferable to carry out
Formula, had carried out repeating no more of explanation.As used below, term " module " can realize the software of predetermined function
And/or the combination of hardware.Although the device described by following example preferably realizes with software, but hardware, or soft
The realization of the combination of part and hardware also may and be contemplated.
Fig. 4 is the structured flowchart of denoising device according to embodiments of the present invention, and as shown in Figure 4, this device includes: gather mould
Block 41, generation module 42 and noise reduction module 43, wherein, acquisition module 41, it is used for gathering ambient noise signal；Generation module 42,
It coupled to acquisition module 41, for the inversion signal of build environment noise signal；Noise reduction module 43, coupled to generation module 42,
For playing inversion signal, to realize the noise reduction to ambient noise signal.
By said structure, solve environment noise and be difficult to the technical problem of noise reduction.This device can be arranged on audio frequency and broadcast
Put position, such as, when being applied on earphone by this device, acquisition module 41 is one or more pick up, is arranged on ear
In hood and/or outside earphone enclosure；Generation module 42 is high speed processing chip, can be arranged on the circuit board of earphone；Noise reduction
Module 43 is one or more speaker, is arranged in earphone enclosure.
Alternatively, generation module 42 includes: screening unit, for by ambient noise signal and presetting in noise sample storehouse
Noise sample carries out aspect ratio pair, filters out one or more noise sample with ambient noise signal characteristic matching；Generate
Unit, coupled to screening unit, for according to one or more noise sample, the inversion signal of build environment noise signal.
Alternatively, device can also include: acquisition module, is used for by mike acquisition noise sample or passes through data
Interface noise sample；Memory module, coupled to acquisition module and screening unit, for storing noise sample to noise sample
This storehouse.
Alternatively, device also includes: selects module, coupled to described screening unit, for selecting from noise sample storehouse
Some or all of noise sample is as default noise sample.
Alternatively, signal generating unit includes: first generates subelement, for directly generating the amplitude phase with ambient noise signal
With and the inversion signal of ambient noise signal of opposite in phase of one or more noise sample；Or second generates son list
, there be one or more inversion signal sample corresponding with one or more noise sample in unit for storage in noise sample storehouse
In the case of Ben, read one or more inversion signal sample and adjust the amplitude of one or more inversion signal sample,
Obtain the inversion signal of ambient noise signal.
It should be noted that above-mentioned modules can be by software or hardware realizes, for the latter, Ke Yitong
Cross in the following manner to realize, but be not limited to this: above-mentioned module is respectively positioned in same processor；Or, above-mentioned module lays respectively at many
In individual processor.
Embodiments of the invention additionally provide a kind of software, and this software is used for performing above-described embodiment and preferred implementation
Described in technical scheme.
Embodiments of the invention additionally provide a kind of storage medium.In the present embodiment, above-mentioned storage medium can be set
It is set to storage for the program code performing following steps:
Step S101, gathers ambient noise signal；
Step S102, the inversion signal of build environment noise signal；
Step S103, plays inversion signal, to realize the noise reduction to ambient noise signal.
Alternatively, in the present embodiment, above-mentioned storage medium can include but not limited to: USB flash disk, read only memory (Read-
Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), mobile hard
The various media that can store program code such as dish, magnetic disc or CD.
Alternatively, the concrete example in the present embodiment is referred to described in above-described embodiment and optional embodiment
Example, the present embodiment does not repeats them here.
In order to the description making the embodiment of the present invention is clearer, it is described below in conjunction with preferred embodiment and illustrates.
In correlation technique, noise cancelling headphone is divided into two kinds: passive noise cancelling headphone and active noise reduction earphone, wherein, and passive type noise reduction
Earphone is mainly by surrounding ear formation closing space, or uses the deadeners such as silica gel earplugs to stop outside noise.By
Do not process through Dolby circuit chip in noise, typically can only intercept high-frequency noise, inconspicuous to low-frequency noise noise reduction.
Earphone active noise reduction (Active Noise Cancellation, referred to as ANC), refers to gather environmental noise, and
Produce the devices such as the signal earphone with noise anti-phase (opposite in phase) to play back, in order to the technology of offset noise.This method base
In principle of stacking, when waveform is identical, phase 180.Two signals when being overlapped mutually, interference cancellation phenomenon will be produced.
One in major part ANC system two kinds of primary structures of employing: feed forward type and reaction type.In feed forward type system,
Sampling mike is positioned at outside earphone, and in order to gather the noise entering earphone, loudspeaker, in order to play inversion signal, are made an uproar in order to offset
Sound.In reaction type system, mike is positioned at inside earphone, gathers so-called " error signal ", in other words, mike collection
The signal that the music signal of normal play mixes with residual noise, after the music signal of normal play is deducted, just obtains
The noise of residual.By appropriate feedback circuit, error signal can be made to reduce as far as possible with the difference of normal music, namely
Say, reduce noise.
The audio frequency range of active noise reduction is typically being this frequency range of 100Hz-1kHz, and major part environment and vehicle
Noise is in the range of 100Hz-1kHz, so to environment vehicle noise noise reduction clearly.The noise reduction that ANC system produces
Signal, is that all sound in the range of this are had neutralization effect, say, that our required useful letter possible
Number, also it is canceled out.Intelligence the most not.It is desirable that there is a technology can identify noise, retain us required
Acoustical signal.
In a preferred embodiment of the invention, it is provided that improve on the basis of a kind of ANC noise reduction in the related
Intelligent noise reduction technology.The principle of ANC active noise reduction collects noise signal exactly, then produces disappears anti-phase with noise signal
Tone signal, thus offset noise.But this process collecting noise is not intelligence, it is to have a default noise frequency
Section, generally 100Hz-1kHz.This belongs to bass frequency range.Our usual so-called noise, such as vehicle, aircraft, subway etc.
Noise, broadly falls into this frequency range.All sound inside this default frequency range, all can be canceled out, including noise and useful
Sound.It is to say, useful sound may also be disappeared.Being in place of the technological improvement of the present invention, we can preset one
The characteristic of a little noises.The noises such as such as vehicle, aircraft, subway, they are that comparison is characteristic in fact.We can be at audio frequency
The waveform of these typical noise is preset in reason system.Its principle is exactly after the waveform sample to noise is sampled, in the later stage
Process in the waveform of whole section of material and sampling noiset sample analysis, automatically remove noise.Make an uproar when mike captures these
During sound, then export anti-phase waveform by noise reduction system and offset.Suitably algorithm can analyze in background and hear and listen not
The noise seen, then passes through a kind of specific algorithm and produces signal, with original signal phase offset or contrary.This phase place is reverse
Sound wave is amplified to proportional to original signal amplitude rear superimposed, produces destructive interference.Thus efficiently reduce background noise.
Thus can individually filter out noise, and the useful sound that we need just is retained when.We drop
The object made an uproar is concentrated mainly on 1kHz and following.Active noise reduction is sensitive for phase bit comparison.And formed at earphone and auricle/auditory meatus
Narrow close in space, inevitably wear difference due to human ear individual diversity XOR and can cause the deviation of phase place, but now
The phase place relative high frequency composition of longer wavelengths of low-frequency component is more stable.
In the preferred embodiment, it is also possible to according to demand self-definedization of client.The sob of such as baby, the sound of finishing
Sound, the sound of train process, we can pre-record in system, and produce anti-phase audio frequency, when inversely adding according to two sound waves,
The principle interfering cancellation can be produced, thus realize " Intelligent noise reduction ".
Fig. 5 provides the structure of a kind of reaction type noise cancelling headphone, and the denoising device of this noise cancelling headphone includes that original audio is believed
Numbers 51, mike 52, process chip 53 and speaker 54, wherein, mike 52 is close proximity to human ear inside, for gathering and people
The sound of the assonance that ear is heard, is equivalent to the acoustical signal of original audio signal 51 and ambient noise signal synthesis；Process
Chip 53 1 aspect gathers original audio signal 51, on the one hand gathers the acoustical signal of mike 52, and by two acoustical signals
Contrast, then can obtain ambient noise signal.Afterwards, processing chip 53 then can be with the anti-phase letter of build environment noise signal
Number, and played back by speaker 54, it is achieved the noise reduction to ambient sound.Processing chip 53 build environment noise signal
During inversion signal, it is not as " active noise reduction ", the noise in a band limits is all balanced out, but " has selection
" remove offset noise, it is simply that the above-mentioned noisy samples that we preset, and generation is met the noise of noise sample
Inversion signal, thus eliminate specific noise targetedly.
In sum, by the way, solve environment noise in correlation technique and be difficult to the technical problem eliminated, it is achieved
Environment noise, the noise reduction of especially specific environment noise, it is effectively improved and listens song definition, and useful acoustic information is carried out
Retain.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Calculating device realize, they can concentrate on single calculating device, or be distributed in multiple calculating device and formed
Network on, alternatively, they can with calculate the executable program code of device realize, it is thus possible to by they store
Performed by calculating device in the storage device, and in some cases, can perform with the order being different from herein shown
The step gone out or describe, or they are fabricated to respectively each integrated circuit modules, or by the multiple modules in them or
Step is fabricated to single integrated circuit module and realizes.So, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a noise-reduction method, it is characterised in that including:
Gather ambient noise signal；
Generate the inversion signal of described ambient noise signal；
Play described inversion signal, to realize the noise reduction to described ambient noise signal.
Method the most according to claim 1, it is characterised in that the inversion signal generating described ambient noise signal includes:
Described ambient noise signal is carried out aspect ratio pair with the default noise sample in noise sample storehouse, filters out and described ring
One or more noise sample of border noise signal characteristic matching；
According to one or more noise sample, generate the inversion signal of described ambient noise signal.
Method the most according to claim 2, it is characterised in that by described ambient noise signal and described default noise sample
Originally carrying out aspect ratio to before, described method also includes:
By mike acquisition noise sample or receive noise sample by data-interface；
Noise sample is stored to described noise sample storehouse.
Method the most according to claim 2, it is characterised in that by described ambient noise signal and noise sample storehouse
Default noise sample carries out aspect ratio to before, and described method also includes:
Select some or all of noise sample as described default noise sample from described noise sample storehouse.
5. according to the method according to any one of claim 2 to 4, it is characterised in that according to one or more noise
Sample, the inversion signal generating described ambient noise signal includes:
Directly generate and the opposite in phase of one or more noise sample identical with the amplitude of described ambient noise signal
The inversion signal of described ambient noise signal；Or
In described noise sample storehouse, storage has one or more corresponding with one or more noise sample anti-phase
In the case of sample of signal, read one or more inversion signal sample and adjust the anti-phase letter of one or more
The amplitude of number sample, obtains the inversion signal of described ambient noise signal.
6. a denoising device, it is characterised in that including:
Acquisition module, is used for gathering ambient noise signal；
Generation module, for generating the inversion signal of described ambient noise signal；
Noise reduction module, is used for playing described inversion signal, to realize the noise reduction to described ambient noise signal.
Device the most according to claim 6, it is characterised in that generation module includes:
Screening unit, for described ambient noise signal is carried out aspect ratio pair with the default noise sample in noise sample storehouse,
Filter out and one or more noise sample of described ambient noise signal characteristic matching；
Signal generating unit, for according to one or more noise sample, generates the inversion signal of described ambient noise signal.
Device the most according to claim 7, it is characterised in that described device also includes:
Acquisition module, for by mike acquisition noise sample or receiving noise sample by data-interface；
Memory module, for storing noise sample to described noise sample storehouse.
Device the most according to claim 7, it is characterised in that described device also includes:
Select module, for selecting some or all of noise sample as described default noise sample from described noise sample storehouse
This.
10. according to the device according to any one of claim 7 to 9, it is characterised in that signal generating unit includes:
First generates subelement, for directly generating and one identical with the amplitude of described ambient noise signal or many
The inversion signal of the described ambient noise signal of the opposite in phase of individual noise sample；Or
Second generates subelement, has corresponding with one or more noise sample for storage in described noise sample storehouse
One or more inversion signal sample in the case of, read one or more inversion signal sample and adjust described in
The amplitude of one or more inversion signal sample, obtains the inversion signal of described ambient noise signal.
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| CN107124494A (en) * | 2017-06-21 | 2017-09-01 | 深圳市泰衡诺科技有限公司 | Receiver noise-reduction method and device |
| CN107799111A (en) * | 2017-10-20 | 2018-03-13 | 维沃移动通信有限公司 | One kind protection shell component harmony ripple removing method |
| CN108536420A (en) * | 2018-04-16 | 2018-09-14 | Oppo广东移动通信有限公司 | Volume adjusting method, electronic device and computer readable storage medium |
| CN108932940A (en) * | 2018-07-05 | 2018-12-04 | 浙江众邦机电科技有限公司 | A kind of industrial sewing machine noise-reduction method, device and equipment based on Operation Conditions |
| CN108932940B (en) * | 2018-07-05 | 2021-04-27 | 浙江众邦机电科技有限公司 | Industrial sewing machine noise reduction method, device and equipment based on operation working conditions |
| CN108810719A (en) * | 2018-08-29 | 2018-11-13 | 歌尔科技有限公司 | A kind of noise-reduction method, neckstrap formula earphone and storage medium |
| CN109639881A (en) * | 2018-11-10 | 2019-04-16 | 东莞市华睿电子科技有限公司 | A kind of control method for playing back for sound intermediate frequency signal of conversing |
| CN110660379A (en) * | 2019-09-29 | 2020-01-07 | 珠海格力电器股份有限公司 | Noise processing method and device and air conditioner |
| CN115236726A (en) * | 2022-07-22 | 2022-10-25 | 中国地质调查局自然资源综合调查指挥中心 | Earthquake single-point acquisition equipment for active noise reduction |
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