CN107889007A - Eliminate active denoising method and system of the noise reduction path to broadcasting acoustic impacts - Google Patents
Eliminate active denoising method and system of the noise reduction path to broadcasting acoustic impacts Download PDFInfo
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- CN107889007A CN107889007A CN201711026343.5A CN201711026343A CN107889007A CN 107889007 A CN107889007 A CN 107889007A CN 201711026343 A CN201711026343 A CN 201711026343A CN 107889007 A CN107889007 A CN 107889007A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention provides a kind of noise reduction path that eliminates to be included the data signal that broadcast source plays being divided into first via data signal and two paths of digital signals to the active denoising method for playing acoustic impacts, wherein described first via data signal is converted into analog electrical signal through D/A converter and is transferred to player progress sound broadcasting, and the two paths of digital signals is transferred to the first digital filter and is filtered to obtain digital cancellation signal；Microphone collects the voice signal that noise signal and player are played, and will be collected into the noise signal and the voice signal is converted to digital mixing signal by a/d converter；The digital mixing signal exports the 3rd railway digital signal with the digital cancellation signal through adder coupling processing, and the 3rd railway digital signal eliminates into noise reduction path to ambient noise.Present invention realization reduces the influence to playing sound while elimination to noise, ensure to play the quality of sound in sound chamber.
Description
Technical field
It is more particularly to a kind of to eliminate master of the noise reduction path to broadcasting acoustic impacts the present invention relates to noise management technique field
Dynamic noise-reduction method and noise reduction system.
Background technology
With intelligentized continuous development, people's living standards continue to improve, people are to earphone requirement also gradually increase.
Usually generally there are two methods, i.e. active noise reduction and passive noise reduction for earphone noise reduction.
Active noise reduction is sent by noise reduction system with the reverse sound wave of ambient noise phase to offset noise sound wave by environment
Noise eliminates, so as to realize the effect of noise reduction.Passive noise reduction is to form closing space by surrounding ear, or uses silica gel ear
The acoustic materials such as plug stop outside noise.Compared with passive noise reduction, active noise reduction earphone is handled by the chip of Dolby circuit,
Noise reduction effectively can be carried out to low-frequency noise, make noise reduction more preferable.
Active noise reduction earphone of the prior art has gradually been gone in people's life, can allow people in noisy environment
Obtain a relatively quiet environment.But prior art active denoising method can affect to playing sound,
The sound for causing earphone to play when eliminating noise integrally reduces, and the sound after reduction is difficult to return to original quality.
Therefore, in order to solve the above problems, it is desirable to be able to eliminate one weakened to playing sound during active noise reduction
Kind eliminates active denoising method and noise reduction system of the noise reduction path to broadcasting acoustic impacts.
The content of the invention
One aspect of the present invention is to provide a kind of noise reduction path that eliminates to playing the active denoising methods of acoustic impacts,
Methods described includes：
The data signal that broadcast source plays is divided into first via data signal and two paths of digital signals, wherein described first
Railway digital signal is converted into analog electrical signal through D/A converter and is transferred to player progress sound broadcasting, the second railway digital letter
Number being transferred to the first digital filter is filtered to obtain digital cancellation signal；
Microphone collects the voice signal that noise signal and player are played, and will be collected into the noise signal and
The voice signal is converted to digital mixing signal by a/d converter；
The digital mixing signal exports the 3rd railway digital signal with the digital cancellation signal through adder coupling processing,
The 3rd railway digital signal eliminates into noise reduction path to ambient noise.
Preferably, the 3rd railway digital signal feeds back to first digital filter, adjusts the numeral and eliminates letter
Number.
Preferably, the noise reduction path is feedback noise reduction path, the digital filter of noise reduction access arrangements second.
Preferably, second digital filter by the 3rd railway digital signal filter after with the first via data signal coupling
Superposition is closed, analog electrical signal is converted to through D/A converter；
The analog electrical signal is transferred to player and carries out sound broadcasting.
Preferably, first digital filter is sef-adapting filter or fixed filters.
Preferably, second digital filter is sef-adapting filter or fixed filters.
Preferably, the adjustment of the digital cancellation signal is carried out as follows：
Update weight vector：W (the n+1)=μ e of w (n)+2 (n) x (n), wherein, w (n) is weight vector, and e (n) is the 3rd railway digital
Signal, x (n) are two paths of digital signals, and μ is step parameter；
Digital cancellation signal after renewal adjustment：Y (n)=wT(n) x (n), wherein, y (n) is the numeral elimination after adjustment
Signal, wT(n) it is the transposed vector of weight vector, x (n) is two paths of digital signals.
Preferably, the step-size parameter mu meets：0 ＜ μ ＜ 2/MPin, wherein, M is filter length, Pin=E [x2(n)]
For the input power of two paths of digital signals.
Another aspect of the present invention is to provide a kind of active noise reduction system of elimination noise reduction path to playing acoustic impacts
System, the system include：
Broadcast source, the first digital filter being directly connected to broadcast source, the data signal that the broadcast source plays are divided into
First via data signal and two paths of digital signals；
The two paths of digital signals that first wave filter directly plays to broadcast source is filtered to obtain numeral and eliminate to believe
Number.
Microphone, collects the noise signal from environment and player plays voice signal.
A/d converter, the noise signal and voice signal that microphone is collected are converted to digital mixing signal；
Noise reduction path, receive adder to exported after the digital cancellation signal and digital mixing signal coupling the
Three railway digital signals carry out noise elimination.
Preferably, the 3rd railway digital signal feeds back to first digital filter, adjusts the numeral and eliminates letter
Number.
A kind of elimination noise reduction path provided by the invention leads to the active denoising method and noise reduction system of broadcasting acoustic impacts
Cross turns into two-way by the sound of broadcasting, is played all the way for sound, and another way is used to support after being filtered by the first wave filter
The microphone that disappears collects the sound of player plays, is made an uproar thereby using the 3rd road analog electrical signal eliminated in noise to be single
Acoustical signal, eliminate in noise canceling procedures and weaken overall broadcasting sound due to collecting the broadcasting sound of player.
The present invention feeds back progress numeral elimination noise by the 3rd railway digital signal and adjusted, can be effectively to the 3rd railway digital
Signal is purified, and dramatically reduces influence of the noise reduction process to the sound of broadcasting.
A kind of elimination noise reduction path provided by the invention has to the active denoising method and noise reduction system of broadcasting acoustic impacts
Effect ground is prevented during active noise reduction because microphone collects the sound of broadcasting and then to the influence of overall broadcasting sound, is made
The playback quality of earphone more steps to a new level.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the limitation to the claimed content of the present invention.
Brief description of the drawings
With reference to the accompanying drawing enclosed, the present invention more purpose, function and advantages will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 diagrammatically illustrates the earphone sound chamber schematic diagram using active noise reduction system of the present invention；
Fig. 2 shows that the signal of active noise reduction system of the present invention transmits schematic diagram；
Fig. 3 shows the adjustment process schematic of digital cancellation signal of the present invention.
Embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment as disclosed below；Can by multi-form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, embodiments of the invention will be described with reference to the drawings, relevant technical terms should be people in the art
Known to member.In the accompanying drawings, identical reference represents same or similar part, or same or like step,
Unless otherwise indicated.Present disclosure is illustrated with reference to specific embodiment, present disclosure is based on actively
In noise reduction process, microphone can be collected into while collecting noise player plays sound (such as in music, Mike
Wind collects the music that noise can be collected into during active noise reduction player plays), and then weaken in active noise reduction
Sound is played, has influence on the quality for playing sound.The noise of the present invention is eliminated by taking the process that earphone plays music as an example below
Illustrate, as shown in Figure 1 using the earphone sound chamber schematic diagram of active noise reduction system of the present invention, the present embodiment using wired earphone as
The signal processing chip 102 that example is accessed the voice signal of broadcasting in earphone by electric wire 105, in certain embodiments can be with
It can be wireless headset to be, the voice signal of broadcasting is linked into the letter of earphone 100 including but not limited to by way of bluetooth
Number process chip 102.A kind of noise reduction path that eliminates of the present embodiment includes to the active noise reduction system for playing acoustic impacts：
Broadcast source, the first digital filter being directly connected to broadcast source, the data signal that broadcast source plays are divided into first
Railway digital signal and two paths of digital signals.Broadcast source in the present invention is digital broadcast source, by sound with the side of data signal
Formula exports.
The two paths of digital signals that first wave filter directly plays to broadcast source is filtered to obtain digital cancellation signal.
Microphone 103, collects the noise signal from environment and player 104 plays voice signal.
A/d converter, the noise signal and voice signal that microphone 103 is collected are converted to digital mixing signal.
Noise reduction path, receive the 3rd tunnel exported after adder couples to the digital cancellation signal and digital mixing signal
Data signal carries out noise elimination.
In the present embodiment, voice signal is linked into earphone by electric wire 105, in signal processing chip 102, broadcast source
Voice signal is converted into first via data signal and two paths of digital signals, first via data signal is changed by D/A converter
After enter in player 104 and play sound, enter user's ear 106.Easily exist in the sound chamber 101 of earphone 100
Influence of the ambient noise to the sound of broadcasting, received according to the present embodiment two paths of digital signals of the present invention, and microphone 103
Collection mixing sound (ambient noise and the sound of the broadcasting of player 104) is linked into signal processing chip 102 and handled.Will processing
Pure noise afterwards is transferred to player 104 and plays the ambient noise eliminated in sound chamber 101 again.
Specific noise-reduction method in the present embodiment is explained below, active noise reduction system of the present invention as shown in Figure 2
Signal transmits schematic diagram, and the present embodiment drops according to a kind of noise reduction path that eliminates provided by the invention to the active for playing acoustic impacts
Method for de-noising includes：
The data signal that broadcast source 206 plays is divided into first via data signal and two paths of digital signals, wherein first
Railway digital signal is converted into analog electrical signal through D/A converter 201 and is transferred to the progress sound broadcasting of player 104.Second railway digital
Signal is transferred to the first digital filter 202 and is filtered to obtain digital cancellation signal.Preferably, the wave filter of the present embodiment first
202 be sef-adapting filter, and the first wave filter 202 can be fixed filters in other embodiments.
The voice signal that microphone 103 collects noise signal and player 105 is played, i.e. ambient noise and player
104 sound played.The noise signal and voice signal will be collected into numeral mixing letter is converted to by a/d converter 205
Number.
Digital mixing signal and digital cancellation signal export the 3rd railway digital signal through the coupling processing of adder 203, and the 3rd
Railway digital signal eliminates into noise reduction path to ambient noise.Because microphone 103 inevitably collects broadcasting
The voice signal that device 104 plays, in order to prevent existing in the reverse sound wave for being used to eliminate noise of noise reduction path output to broadcasting
The sound wave of the play signal of device 104 weakening is put, the present invention is by the first digital filter 202 and adder 203 in advance to numeral
The voice signal played in mixed signal by player 104 is eliminated, to ensure the noise signal in noise reduction path more
It is pure.
Further, the elimination process of the voice signal played in the present invention to player 104 sets feedback mechanism, leads to
Cross the 3rd railway digital signal to feed back to the first digital filter 202, and adjust digital cancellation signal.Number of the present invention as shown in Figure 3
Word eliminates the adjustment process schematic of signal, and the 3rd railway digital signal feeds back to first digital filter, adjusts the number
Word eliminates signal.
Specifically, the adjustment of digital cancellation signal is carried out as follows：
Update weight vector：W (the n+1)=μ e of w (n)+2 (n) x (n), wherein, w (n) is weight vector, and e (n) is the 3rd railway digital
Signal, x (n) are two paths of digital signals, and μ is step parameter, and step-size parameter mu meets：0 ＜ μ ＜ 2/MPin, wherein, M is filtering
Device length, Pin=E [x2(n) it is] input power of two paths of digital signals.
Digital cancellation signal after renewal adjustment：Y (n)=wT(n) x (n), wherein, y (n) is the numeral elimination after adjustment
Signal, wT(n) it is the transposed vector of weight vector, x (n) is two paths of digital signals.
In the present embodiment, noise reduction path is feedback noise reduction path, and the second digital filter 204 is arranged on noise reduction path.
After second digital filter filters the 3rd railway digital signal, superposition is coupled with first via data signal and is converted to through D/A converter
Analog electrical signal, analog electrical signal are transferred to player and carry out sound broadcasting.While player plays sound, environment is made an uproar
Sound realizes noise reduction.Preferably, the second wave filter of the present embodiment 204 is sef-adapting filter, in other embodiments the second filtering
Device 204 can be fixed filters.
The elimination of the voice signal played by the above method of the present invention to player in digital mixing signal 104, protect
It is pure noise signal to have demonstrate,proved the 3rd railway digital signal entered in noise reduction path.Second digital filter 204 is by the 3rd tunnel
After digital signal filter, superposition is coupled with first via data signal and is converted into analog electrical signal through D/A converter 201.Analog telecommunications
Number it is transferred to player 104 to carry out sound and play to eliminate the noise in sound chamber, realizes active noise reduction.
A kind of elimination noise reduction path provided by the invention leads to the active denoising method and noise reduction system of broadcasting acoustic impacts
Cross turns into two-way by the sound of broadcasting, is played all the way for sound, and another way is used to support after being filtered by the first wave filter
The microphone that disappears collects the sound of player plays, is made an uproar thereby using the 3rd road analog electrical signal eliminated in noise to be single
Acoustical signal, eliminate in noise canceling procedures and weaken overall broadcasting sound due to collecting the broadcasting sound of player.
The present invention feeds back progress numeral elimination noise by the 3rd railway digital signal and adjusted, can be effectively to the 3rd railway digital
Signal is purified, and dramatically reduces influence of the noise reduction process to the sound of broadcasting.
A kind of elimination noise reduction path provided by the invention has to the active denoising method and noise reduction system of broadcasting acoustic impacts
Effect ground is prevented during active noise reduction because microphone collects the sound of broadcasting and then to the influence of overall broadcasting sound, is made
The playback quality of earphone more steps to a new level.
With reference to the explanation of the invention disclosed here and practice, other embodiment of the invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is to be considered only as exemplary, of the invention true scope and purport is equal
It is defined in the claims.
Claims (10)
1. a kind of eliminate active denoising method of the noise reduction path to broadcasting acoustic impacts, it is characterised in that methods described includes：
The data signal that broadcast source plays is divided into first via data signal and two paths of digital signals, wherein the first via number
Word signal is converted into analog electrical signal through D/A converter and is transferred to player progress sound broadcasting, and the two paths of digital signals passes
The first digital filter is defeated by be filtered to obtain digital cancellation signal；
Microphone collects the voice signal that noise signal and player are played, and will be collected into the noise signal and described
Voice signal is converted to digital mixing signal by a/d converter；
The digital mixing signal exports the 3rd railway digital signal with the digital cancellation signal through adder coupling processing, described
3rd railway digital signal eliminates into noise reduction path to ambient noise.
2. according to the method for claim 1, it is characterised in that the 3rd railway digital signal feeds back to first numeral
Wave filter, adjust the digital cancellation signal.
3. according to the method for claim 1, it is characterised in that the noise reduction path is feedback noise reduction path, the noise reduction
The digital filter of access arrangements second.
4. according to the method for claim 3, it is characterised in that second digital filter filters the 3rd railway digital signal
After ripple, superposition is coupled with the first via data signal and is converted to analog electrical signal through D/A converter；
The analog electrical signal is transferred to player and carries out sound broadcasting.
5. method according to claim 1 or 2, it is characterised in that first digital filter is sef-adapting filter
Or fixed filters.
6. the method according to claim 3 or 4, it is characterised in that second digital filter is sef-adapting filter
Or fixed filters.
7. according to the method for claim 2, it is characterised in that the adjustment of the digital cancellation signal is entered as follows
OK：
Update weight vector：W (the n+1)=μ e of w (n)+2 (n) x (n), wherein, w (n) is weight vector, and e (n) believes for the 3rd railway digital
Number, x (n) is two paths of digital signals, and μ is step parameter；
Digital cancellation signal after output adjustment：Y (n)=wT(n) x (n), wherein, y (n) is the digital cancellation signal after adjustment,
wT(n) it is the transposed vector of weight vector, x (n) is two paths of digital signals.
8. according to the method for claim 7, it is characterised in that the step-size parameter mu meets：0 ＜ μ ＜ 2/MPin, wherein, M
For filter length, Pin=E [x2(n) it is] input power of two paths of digital signals.
9. a kind of eliminate active noise reduction system of the noise reduction path to broadcasting acoustic impacts, it is characterised in that the system includes：
Broadcast source, the first digital filter being directly connected to broadcast source, the data signal that the broadcast source plays are divided into first
Railway digital signal and two paths of digital signals；
The two paths of digital signals that first wave filter directly plays to broadcast source is filtered to obtain digital cancellation signal,
Microphone, collects the noise signal from environment and player plays voice signal；
A/d converter, the noise signal and voice signal that microphone is collected are converted to digital mixing signal；
Noise reduction path, receive the 3rd tunnel exported after adder couples to the digital cancellation signal and the digital mixing signal
Data signal, and carry out noise elimination.
10. according to the method for claim 9, it is characterised in that the 3rd railway digital signal feeds back to first number
Word wave filter, adjust the digital cancellation signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026343.5A CN107889007B (en) | 2017-10-27 | 2017-10-27 | Active noise reduction method and system for eliminating influence of noise reduction channel on playing sound |
| US16/172,763 US10410654B2 (en) | 2017-10-27 | 2018-10-27 | Active noise control headphones |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711026343.5A CN107889007B (en) | 2017-10-27 | 2017-10-27 | Active noise reduction method and system for eliminating influence of noise reduction channel on playing sound |
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| CN107889007A true CN107889007A (en) | 2018-04-06 |
| CN107889007B CN107889007B (en) | 2020-02-18 |
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| JP2020162046A (en) * | 2019-03-27 | 2020-10-01 | 日本電気株式会社 | Voice output device, voice output method and voice output program |
| WO2021017136A1 (en) * | 2019-07-26 | 2021-02-04 | 歌尔股份有限公司 | Noise reduction method and device for earphone, earphone, and readable storage medium |
| CN113163300A (en) * | 2021-03-02 | 2021-07-23 | 广州朗国电子科技有限公司 | Audio noise reduction circuit and electronic equipment |
| WO2022140928A1 (en) * | 2020-12-28 | 2022-07-07 | 深圳市韶音科技有限公司 | Audio signal processing method and system for suppressing echo |
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