CN107750027A - scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method - Google Patents
scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method Download PDFInfo
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- CN107750027A CN107750027A CN201711243106.4A CN201711243106A CN107750027A CN 107750027 A CN107750027 A CN 107750027A CN 201711243106 A CN201711243106 A CN 201711243106A CN 107750027 A CN107750027 A CN 107750027A
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- noise reduction
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- active noise
- adaptive active
- earphone
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to active noise reduction field, in particular to a kind of scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method.The scene adaptive active noise reduction earphone and scene adaptive active noise reduction design method, the optimal noise reduction under different scenes noise is realized by Noise Acquisition and analytic unit, noise pattern library unit and filter bank unit.Ambient noise is acquired first, and it is analyzed, obtains corresponding characteristic value；Secondly, noise signal is matched with default noise pattern in ambient noise pattern base according to characteristic value, determines noise type；Finally, according to noise type, corresponding wave filter is selected from filter bank.It is this by noise pattern being identified the method so that it is determined that wave filter, corresponding wave filter can be selected according to noise pattern, improve computational efficiency；Different wave filters is selected always according to different noise characteristics, the optimization of noise reduction can be realized.
Description
Technical field
The present invention relates to active noise reduction field, in particular to a kind of scene adaptive active noise reduction earphone and scene
Adaptive active noise reduction design method.
Background technology
With the economic fast development with science and technology, active noise reduction techniques also reach its maturity, and embody a concentrated reflection of active noise reduction
In the application of earphone.Active noise reduction earphone is that the mode combined using passive noise reduction and active noise reduction eliminates noise.Noise cancelling headphone
Earphone user is isolated with outside noise using earplug or earmuff, i.e., passive noise reduction mode, eliminate high-frequency noise；Using actively
Noise reduction system produces noise cancellation signal equal with noise signal amplitude, opposite in phase, i.e. active noise reduction mode, in elimination, low frequency
Noise.The noise reduction of active noise reduction earphone largely depends on the design of active noise reduction system.
The existing most of noise cancelling headphone of in the market is all the noise reduction schemes using above-mentioned fixed noise reduction parameters.Due to difference
Noise reduction scene, noise is different in the distribution character of each frequency range, therefore, using active noise reduction corresponding to identical noise reduction parameters
System can not obtain optimal noise reduction under each noise reduction scene.A kind of method of adaptive active noise reduction of patent of invention, it is
System and earphone (201610008962.0) select drop according to the gas leakage situation of earmuff after wearing from the noise reduction mode pre-established
The good noise reduction mode of effect of making an uproar carries out noise reduction, although noise reduction is effectively increased, and noise is special under unresolved different scenes
The problem of noise reduction that sex differernce is brought deteriorates.Patent of invention a kind of noise-reduction method, the device of the gain of automatic adjusument noise reduction
And noise cancelling headphone (201610373999.3) is set and current noise grade pair by the current noise grade according to external environment
The noise reduction yield value answered so that noise cancelling headphone can automatic adjusument noise reduction gain, this method can optimize to a certain extent
Noise reduction, but the optimal noise reduction under different noise reduction scenes can not be realized.
The content of the invention
To solve the above problems, the purpose of the embodiment of the present invention be to provide a kind of scene adaptive active noise reduction earphone and
Scene adaptive active noise reduction design method, to improve noise abatement.
In a first aspect, the embodiments of the invention provide a kind of scene adaptive active noise reduction earphone, including：Including：Earphone
Housing and adaptive active noise reduction system；
The adaptive active noise reduction system is installed in the earphone case.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the first of first aspect, wherein：Institute
It is ear type or ear-shield type to state earphone case.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of second of first aspect, wherein：Institute
Stating adaptive active noise reduction system includes：Microphone, adaptive noise reduction module and the loudspeaker being sequentially connected.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the third of first aspect, wherein：Institute
Stating adaptive noise reduction module includes：Analog to digital conversion circuit, adaptive noise reduction unit and the D/A converting circuit being sequentially connected.
Analog-digital conversion circuit as described, also it is connected with microphone；The D/A converting circuit, also it is connected with the loudspeaker.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 4th of first aspect kind, wherein：Institute
Stating adaptive noise reduction unit includes：Noise Acquisition and analytic unit, noise pattern library unit and filter bank unit.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 5th of first aspect kind, wherein：Institute
Stating noise pattern library unit is formed after gathering, classify offline according to a variety of ambient noises.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 6th of first aspect kind, wherein：Institute
Stating filter bank unit includes multigroup wave filter of offline design under different classes of ambient noise.
Second aspect, the embodiments of the invention provide a kind of scene adaptive active noise reduction design method, apply above-mentioned
In scene adaptive active noise reduction earphone, including：
Ambient noise is gathered and analyzed, obtains the characteristic value of noise signal；
According to characteristic value, noise class of the noise signal in noise pattern storehouse is determined；
According to noise class, corresponding wave filter is selected in filter bank.
With reference to second aspect, the embodiments of the invention provide the possible embodiment of the first of second aspect, wherein：Institute
The characteristic value of noise signal is stated by being obtained to noise signal progress Fast Fourier Transform (FFT) or wavelet transformation.
The embodiment of the present invention provides a kind of scene adaptive active noise reduction earphone and scene adaptive active noise reduction design side
Method, realized by Noise Acquisition and analytic unit, noise pattern library unit and filter bank unit under different scenes noise
Optimal noise reduction.Ambient noise is acquired first, and it is analyzed, obtains corresponding characteristic value；Secondly, according to spy
Value indicative is matched noise signal with default noise pattern in ambient noise pattern base, determines noise type；Finally, according to
Noise type, corresponding wave filter is selected from filter bank.It is this by noise pattern being identified so that it is determined that filtering
The method of device, one side noise pattern and wave filter are all offline designs, need to only be directed to ambient noise signal instantly and be divided
Analysis, corresponding wave filter is selected according to noise pattern, this mode can be saved largely in line computation time and memory capacity, carried
Computationally efficient；On the other hand, different wave filters is selected according to different noise characteristics, the optimal of noise reduction can be realized
Change.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows that the present invention implements a kind of structural representation of the 1 scene adaptive active noise reduction earphone provided；
Fig. 2 shows that the present invention is implemented in a kind of 1 scene adaptive active noise reduction earphone provided, adaptive actively to drop
Make an uproar system structure diagram；
Fig. 3 shows that the present invention is implemented in a kind of 1 scene adaptive active noise reduction earphone provided, adaptive noise reduction mould
Block structure schematic diagram；
Fig. 4 shows that the present invention is implemented in a kind of 1 scene adaptive active noise reduction earphone provided, adaptive noise reduction list
Meta structure schematic diagram；
Fig. 5 shows a kind of scene adaptive active noise reduction design method flow chart that the embodiment of the present invention 2 is provided.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Middle accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
It is part of the embodiment of the present invention, rather than whole embodiments.The present invention being generally described and illustrated herein in the accompanying drawings is real
Applying the component of example can be configured to arrange and design with a variety of.Therefore, it is of the invention to what is provided in the accompanying drawings below
The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of the selected reality of the present invention
Apply example.Based on embodiments of the invention, institute that those skilled in the art are obtained on the premise of creative work is not made
There is other embodiment, belong to the scope of protection of the invention.
In the description of the invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " are answered
It is interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, the tool of above-mentioned term in the present invention can be understood with concrete condition
Body implication.
Embodiment 1
The structural representation of scene adaptive active noise reduction earphone shown in Figure 1, the present embodiment provide a kind of scene
Adaptive active noise reduction earphone, including earphone case 1 and adaptive active noise reduction system 2；
Above-mentioned adaptive active noise reduction system 2 is installed in the earphone case 1.
In one embodiment, above-mentioned earphone case 1 can be ear type or ear-shield type.
In one embodiment, adaptive noise reduction system structure diagram shown in Figure 2, above-mentioned adaptive active
Noise reduction system 2 includes：Microphone 21, adaptive noise reduction module 22 and the loudspeaker 23 being sequentially connected.
The noise sound wave detected is converted into noise signal transmission to adaptive noise reduction module 22 by microphone 21, through adaptive
Noise reduction module 22 is answered to export noise cancellation signal after handling, noise cancellation signal generates de-noising sound wave after the broadcasting of loudspeaker 23.
In one embodiment, adaptive noise reduction modular structure schematic diagram shown in Figure 3, above-mentioned adaptive noise reduction
Module 22 includes：Analog to digital conversion circuit 221, adaptive noise reduction unit 222 and the D/A converting circuit 223 being sequentially connected.
Above-mentioned analog to digital conversion circuit 221, also it is connected with each microphone 21, the noise signal for being gathered to microphone is carried out
Analog-to-digital conversion, and give the noise signal transmission after analog-to-digital conversion to above-mentioned adaptive noise reduction unit 222.
Above-mentioned adaptive noise reduction unit 222, for carrying out noise reduction process to the noise signal after analog-to-digital conversion, obtain de-noising
Signal, and obtained above-mentioned noise cancellation signal is transferred to above-mentioned D/A converting circuit 223.
Above-mentioned D/A converting circuit 223, also it is connected with above-mentioned loudspeaker 23, turns for carrying out digital-to-analogue to above-mentioned noise cancellation signal
Change, and the noise cancellation signal after digital-to-analogue conversion is transferred to above-mentioned loudspeaker.
Analog to digital conversion circuit 221 and D/A converting circuit 223 can be respectively adopted it is existing it is any can realize modulus turn
Change and the chip or integrated circuit of digital-to-analogue conversion, no longer repeat one by one here.
In one embodiment, adaptive noise reduction cellular construction schematic diagram shown in Figure 4, above-mentioned adaptive noise reduction
Unit 222 includes：Noise Acquisition and analytic unit 2221, noise pattern library unit 2222 and filter bank unit 2223.
Above-mentioned Noise Acquisition is acquired and analyzed to real-time ambient noise with analytic unit 2221, and result is transmitted
To noise pattern library unit.
In one embodiment, above-mentioned noise pattern library unit 2222 is to be gathered, divided offline according to a variety of ambient noises
Formed after class.By the way that various ambient noises are acquired and analyzed offline, above-mentioned make an uproar is implanted into after various ambient noises are classified
Sound pattern library unit.
In one embodiment, above-mentioned filter bank unit 2223 includes offline design under different classes of ambient noise
Multigroup wave filter.For sorted various ambient noises, wave filter corresponding to offline design, and by the multigroup wave filter of gained
It is implanted into above-mentioned filter bank unit.
Embodiment 2
Scene adaptive active noise reduction design method flow chart shown in Figure 5, the present embodiment propose a kind of scene certainly
Active noise reduction design method is adapted to, the scene adaptive active noise reduction earphone proposed for design embodiments 1, including following design
Step：
Step 501, ambient noise is gathered and analyzed, obtain the characteristic value of noise signal；
In one embodiment, features described above value is by carrying out Fast Fourier Transform (FFT) or wavelet transformation to noise signal
Obtain.
Noise signal in real time is acquired, and utilizes Fast Fourier Transform (FFT) or the feature of wavelet transformation extraction signal
Value.
Step 502, according to characteristic value, determine noise class of the noise signal in noise pattern storehouse；
According to the characteristic value of current noise signal, above-mentioned noise signal and a certain environmental pattern in noise pattern storehouse are entered
Row matching, determine the mode type of the noise signal.
Above-mentioned noise pattern storehouse is to gather a variety of ambient noises offline, and is generated after signature analysis, classification are carried out to it.
Step 503, according to noise class, corresponding wave filter is selected in filter bank.
By determining classification of the noise signal in real time in noise pattern storehouse, according to its classification, selected in filter bank
Corresponding wave filter.
Multigroup wave filter is according to different types of ambient noise in above-mentioned filter bank, is generated after offline design.
Preferably, the wave filter design under a certain ambient noise can be attributed to an optimization problem.
Assuming that optimal offline feedback wave filter need to be designed under a certain ambient noise, wherein H represents feedback filter transmission
Function, G represent the transaudient characteristic transmission function of loudspeaker.To ensure that noise reduction is optimal, demand obtains H, meets formulaMinimum, wherein A (w) represent the weighted function based on ambient noise frequency response, and w represents frequency
Rate, the weighted function is related to frequency response amplitude corresponding to frequency, and frequency response amplitude is bigger, and corresponding weighted functional value is bigger.
Obviously, those skilled in the art should be understood that each step of above-mentioned design method can be filled with general calculating
To put to realize, they can be concentrated on single computing device, or are distributed on the network that multiple computing devices are formed,
Alternatively, they can be realized with the program code that computing device can perform, it is thus possible to be stored in storage device
In performed by computing device, they are either fabricated to each integrated circuit modules respectively or by multiple moulds in them
Block or step are fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software
With reference to.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (9)
- A kind of 1. scene adaptive active noise reduction earphone, it is characterised in that including：Earphone case and adaptive active noise reduction system System；The adaptive active noise reduction system is installed in the earphone case.
- 2. scene adaptive active noise reduction earphone according to claim 1, it is characterised in that the earphone case is earplug Formula or ear-shield type.
- 3. scene adaptive active noise reduction earphone according to claim 1, it is characterised in that the adaptive active noise reduction System includes：Microphone, adaptive noise reduction module and the loudspeaker being sequentially connected.
- 4. scene adaptive active noise reduction earphone according to claim 3, it is characterised in that the adaptive noise reduction module Including：Analog to digital conversion circuit, adaptive noise reduction unit and the D/A converting circuit being sequentially connected；Analog-digital conversion circuit as described, also it is connected with microphone；The D/A converting circuit, also it is connected with the loudspeaker.
- 5. scene adaptive active noise reduction earphone according to claim 4, it is characterised in that the adaptive noise reduction unit Including：Noise Acquisition and analytic unit, noise pattern library unit and filter bank unit.
- 6. scene adaptive active noise reduction earphone according to claim 5, it is characterised in that the noise pattern library unit It is to be formed after gathering, classify offline according to a variety of ambient noises.
- 7. scene adaptive active noise reduction earphone according to claim 5, it is characterised in that the filter bank unit bag Include multigroup wave filter of offline design under different classes of ambient noise.
- 8. a kind of scene adaptive active noise reduction design method, actively dropped for designing the scene adaptive described in claim 1 Make an uproar earphone, it is characterised in that including：Ambient noise is gathered and analyzed, obtains the characteristic value of noise signal；According to characteristic value, noise class of the noise signal in noise pattern storehouse is determined；According to noise class, corresponding wave filter is selected in filter bank.
- 9. scene adaptive active noise reduction design method according to claim 8, it is characterised in that the noise signal Characteristic value to noise signal progress Fast Fourier Transform (FFT) or wavelet transformation by obtaining.
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Cited By (11)
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| CN108538281A (en) * | 2018-04-18 | 2018-09-14 | 会听声学科技（北京）有限公司 | Noise-reduction method, noise reduction system and earphone |
| CN108882092A (en) * | 2018-07-03 | 2018-11-23 | 歌尔智能科技有限公司 | A kind of earphone noise-reduction method and feedback noise reduction system |
| CN109714663A (en) * | 2018-12-21 | 2019-05-03 | 歌尔科技有限公司 | A kind of control method of earphone, earphone and storage medium |
| CN110996208A (en) * | 2019-12-13 | 2020-04-10 | 恒玄科技(上海)股份有限公司 | Wireless earphone and noise reduction method thereof |
| CN111510814A (en) * | 2020-04-29 | 2020-08-07 | Oppo广东移动通信有限公司 | Noise reduction mode control method and device, electronic equipment and storage medium |
| CN112235674A (en) * | 2020-09-24 | 2021-01-15 | 海菲曼（天津）科技有限公司 | Active noise reduction processing method, system and chip based on noise analysis |
| CN112309359A (en) * | 2020-07-14 | 2021-02-02 | 深圳市逸音科技有限公司 | Method for intelligent scene switching active noise reduction of high-speed audio codec and earphone |
| CN112423175A (en) * | 2019-08-20 | 2021-02-26 | Oppo广东移动通信有限公司 | Earphone noise reduction method and device, storage medium and electronic equipment |
| CN113259824A (en) * | 2021-05-14 | 2021-08-13 | 谷芯(广州)技术有限公司 | Real-time multi-channel digital hearing aid noise reduction method and system |
| CN113257217A (en) * | 2021-04-27 | 2021-08-13 | 歌尔股份有限公司 | Self-adaptive active noise reduction method and system and active noise reduction earphone |
| WO2021189309A1 (en) * | 2020-03-25 | 2021-09-30 | 深圳市汇顶科技股份有限公司 | Method and system for active noise reduction, electronic device, and chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108538281A (en) * | 2018-04-18 | 2018-09-14 | 会听声学科技（北京）有限公司 | Noise-reduction method, noise reduction system and earphone |
| CN108882092A (en) * | 2018-07-03 | 2018-11-23 | 歌尔智能科技有限公司 | A kind of earphone noise-reduction method and feedback noise reduction system |
| CN109714663A (en) * | 2018-12-21 | 2019-05-03 | 歌尔科技有限公司 | A kind of control method of earphone, earphone and storage medium |
| CN112423175A (en) * | 2019-08-20 | 2021-02-26 | Oppo广东移动通信有限公司 | Earphone noise reduction method and device, storage medium and electronic equipment |
| CN112423175B (en) * | 2019-08-20 | 2023-03-07 | Oppo广东移动通信有限公司 | Earphone noise reduction method and device, storage medium and electronic equipment |
| CN110996208A (en) * | 2019-12-13 | 2020-04-10 | 恒玄科技(上海)股份有限公司 | Wireless earphone and noise reduction method thereof |
| WO2021189309A1 (en) * | 2020-03-25 | 2021-09-30 | 深圳市汇顶科技股份有限公司 | Method and system for active noise reduction, electronic device, and chip |
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| CN111510814A (en) * | 2020-04-29 | 2020-08-07 | Oppo广东移动通信有限公司 | Noise reduction mode control method and device, electronic equipment and storage medium |
| CN112309359A (en) * | 2020-07-14 | 2021-02-02 | 深圳市逸音科技有限公司 | Method for intelligent scene switching active noise reduction of high-speed audio codec and earphone |
| CN112309359B (en) * | 2020-07-14 | 2024-04-30 | 深圳市逸音科技有限公司 | Intelligent scene switching active noise reduction method of high-speed audio coder and earphone |
| CN112235674B (en) * | 2020-09-24 | 2022-11-04 | 头领科技（昆山）有限公司 | Active noise reduction processing method, system and chip based on noise analysis |
| CN112235674A (en) * | 2020-09-24 | 2021-01-15 | 海菲曼（天津）科技有限公司 | Active noise reduction processing method, system and chip based on noise analysis |
| CN113257217A (en) * | 2021-04-27 | 2021-08-13 | 歌尔股份有限公司 | Self-adaptive active noise reduction method and system and active noise reduction earphone |
| CN113259824A (en) * | 2021-05-14 | 2021-08-13 | 谷芯(广州)技术有限公司 | Real-time multi-channel digital hearing aid noise reduction method and system |
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