CN107864419A - It is a kind of for the simulating of active noise reduction, numeral mixing noise reduction system - Google Patents
It is a kind of for the simulating of active noise reduction, numeral mixing noise reduction system Download PDFInfo
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- CN107864419A CN107864419A CN201710990205.2A CN201710990205A CN107864419A CN 107864419 A CN107864419 A CN 107864419A CN 201710990205 A CN201710990205 A CN 201710990205A CN 107864419 A CN107864419 A CN 107864419A
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- signal
- noise reduction
- noise
- filter
- reduction system
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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
- H04R1/1041—Mechanical or electronic switches, or control elements
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/01—Noise reduction using microphones having different directional characteristics
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
It is provided by the invention a kind of to include the Noise Acquisition microphone being sequentially connected for the simulating of active noise reduction, numeral mixing noise reduction system, the system, analog electrical signal is converted to for acquisition noise signal, and by the noise signal；Analog filter, receive the analog electrical signal and processing is filtered to the analog electrical signal；A/d converter, the analog electrical signal after analog filter filtering process is received, and be converted to data signal；Digital filter, receive the data signal and carry out digital filtering process；ANC noise signal phasing back units, the data signal after digital filter is handled carry out phasing back and obtain digital cancellation signal；D/A converter, the digital cancellation signal is converted into electric signal；Player, the electric signal is converted into the anti-phase sound wave of noise and played out.The present invention effectively can carry out flexible modulation on the basis of resources of chip requirement is reduced to active noise reduction.
Description
Technical field
It is more particularly to a kind of for the simulating of active noise reduction, numeral mixing drop the present invention relates to earphone noise reduction technology field
Make an uproar 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 generally use is the mode of digital filtering or the mode of full analog filtering in the prior art
It is filtered, i.e., only carries out digital filtering or analog electrical signal filtering during active noise reduction in the prior art.However, for
The mode of digital filtering requires that the hardware resource of chip is relatively more, no matter precision or filter length require it is higher, such as
Fruit precision is inadequate, in some cases be difficult to be adapted to, the noise reduction of active noise reduction can be influenceed.Only carry out analog electrical signal
The scheme of filtering is even more to be difficult to for some adaptation functions for adjusting digital ANC (active noise reduction) and underaction.
Therefore, in order to solve the above problems, it is desirable to be able to reduce the requirement of resources of chip, while take into account the spirit of active noise reduction
Activity it is a kind of for the simulating of active noise reduction, numeral mixing noise reduction system.
The content of the invention
It is an object of the invention to provide a kind of for the simulating of active noise reduction, numeral mixing noise reduction system, the system
Noise Acquisition microphone, analog filter, a/d converter, digital filter, ANC noise signal phases including being sequentially connected are anti-
Turn unit, D/A converter and player, wherein
Noise Acquisition microphone, analog electrical signal is converted to for acquisition noise signal, and by the noise signal；
Analog filter, receive the analog electrical signal and processing is filtered to the analog electrical signal；
A/d converter, the analog electrical signal after analog filter filtering process is received, and be converted to data signal；
Digital filter, receive the data signal and carry out digital filtering process；
ANC noise signal phasing back units, the data signal after digital filter is handled carry out phasing back and obtained
Digital cancellation signal；
D/A converter, the digital cancellation signal is converted into electric signal；
Player, the electric signal is converted into the anti-phase sound wave of noise and played out.
Preferably, the mixing noise reduction system is arranged in the feedforward path and/or active noise reduction system of active noise reduction system
Feedback network.
Preferably, the analog filter is low pass filter.
Preferably, the cut-off frequency of the low pass filter is 10Hz.
Preferably, the low pass filter is that difference filter includes the first electric capacity, and in parallel with first electric capacity
The second electric capacity, described first electric capacity one end connects a/d converter positive pole, other end connection Noise Acquisition microphone positive pole；
Described second electric capacity one end connects a/d converter negative pole, other end connection Noise Acquisition microphone negative pole.
Preferably, the low pass filter also includes power supply, first resistor, the 3rd electric capacity and the second resistance of series connection, institute
State second resistance and connect the noise microphone negative pole.
Preferably, the digital filter is iir filter and/or FIR filter.
Preferably, the iir filter is straight line I mode filters or straight line II mode filters.
It is provided by the invention a kind of for the simulating of active noise reduction, numeral mixing noise reduction system, to Noise Acquisition microphone
The noise of collection carries out analog electrical signal filtering first, to reduce requirement of the digital filter to resources of chip.To passing through simulation
Analog signal after filter process carries out digital filtering after being AD converted again, and the signal after mixed filtering is re-fed into
ANC noise signal phasing backs unit carries out active noise reduction.Provided by the present invention for the simulating of active noise reduction, numeral mixing drop
The system of making an uproar significantly reduces the dependence to chip hardware resource, while also ensure that the flexibility of active noise reduction, has master
The noise reduction of dynamic noise reduction.
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 structured flowchart of present invention mixing noise reduction system；
Fig. 2 is shown in one embodiment of the invention using the active noise reduction of present invention mixing noise reduction system；
Fig. 3 is shown in another embodiment of the present invention using the active noise reduction of present invention mixing noise reduction system；
Fig. 4 shows the circuit diagram of the analog filter of one embodiment of the invention；
Fig. 5 shows that the signal of the IIR linear pattern digital filters of one embodiment of the invention transmits schematic diagram；
Fig. 6 shows that the signal of another embodiment of the present invention Finite Impulse Response filter transmits schematic diagram.
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 described in detail below by specific embodiment, the present invention is mixed as shown in Figure 1
The structured flowchart of noise reduction system is closed, it is a kind of to include successively for the simulating of active noise reduction, numeral mixing noise reduction system, the system
The Noise Acquisition microphone 101 of connection, analog filter 102, a/d converter 103, digital filter 104, ANC noise signal phases
Bit reversal unit 105, D/A converter 106 and player 107, wherein
Noise Acquisition microphone 101, analog electrical signal is converted to for acquisition noise signal, and by the noise signal.
Analog filter 102, receive the analog electrical signal and processing is filtered to the analog electrical signal.
A/d converter 103, the analog electrical signal after the filtering process of analog filter 102 is received, and be converted to numeral
Signal.
Digital filter 104, receive the data signal and carry out digital filtering process.
ANC noise signal phasing backs unit 105, it is anti-that the data signal after digital filter 104 is handled carries out phase
Turn to obtain digital cancellation signal.
D/A converter 106, the digital cancellation signal is converted into electric signal.
Player 107, the electric signal is converted into the anti-phase sound wave of noise and played out.
According to offer of the present invention be used for the simulating of active noise reduction, numeral mixing noise reduction system is arranged in active noise reduction
The feedforward path of system and/or the feedback network of active noise reduction system.This hair is used in one embodiment of the invention as shown in Figure 2
The mixing noise reduction system of the present invention is arranged in feedback network by the active noise reduction of bright mixing noise reduction system, the present embodiment, noise
The ambient noise in the collection sound chamber of microphone 201 is gathered, the noise signal is converted into analog electrical signal.Analog filter
202, receive analog electrical signal and processing is filtered to analog electrical signal.A/d converter 203, which receives, passes through analog filter 202
Analog electrical signal after filtering process, and be converted to data signal.Digital filter 204 receives data signal and carries out digital filter
Ripple processing.Data signal after ANC noise signal phasing backs unit 205 handles digital filter 204 carries out phasing back
Obtain digital cancellation signal.Digital cancellation signal is converted to electric signal by D/A converter 206, is played by player 207 and environment
The opposite sound wave of noise phase is to eliminate ambient noise.
Using the active noise reduction of present invention mixing noise reduction system in another embodiment of the present invention as shown in Figure 3, for this
Embodiment is arranged in the feedforward of active noise reduction system provided by the present invention for the simulating of active noise reduction, numeral mixing noise reduction system
The feedback network of path and active noise reduction system.As shown in figure 3, the arrangement mixing noise reduction system in feedback network 300, and
Also arrangement mixes noise reduction system in feedforward path 400.
In feedback network 300, Noise Acquisition microphone 301 gathers the ambient noise in sound chamber, by the noise signal
Be converted to analog electrical signal.Analog filter 302, receive analog electrical signal and processing is filtered to analog electrical signal.AD turns
Parallel operation 303 receives the analog electrical signal after the filtering process of analog filter 302, and is converted to data signal.Digital filtering
Device 304 receives data signal and carries out digital filtering process.ANC noise signal phasing backs unit 305 is by digital filter 304
Data signal after processing carries out phasing back and obtains digital cancellation signal.D/A converter 306 is converted to digital cancellation signal
Electric signal, played by player 307 with the sound wave of ambient noise opposite in phase to eliminate ambient noise.
In feedforward path 400, Noise Acquisition microphone 401 gathers the ambient noise in sound chamber, by the noise signal
Be converted to analog electrical signal.Analog filter 402, receive analog electrical signal and processing is filtered to analog electrical signal.AD turns
Parallel operation 403 receives the analog electrical signal after the filtering process of analog filter 402, and is converted to data signal.Digital filtering
Device 404 receives data signal and carries out digital filtering process.ANC noise signal phasing backs unit 405 is by digital filter 404
Data signal after processing carries out phasing back and obtains digital cancellation signal.D/A converter 406 is converted to digital cancellation signal
Electric signal, played by player 407 with the sound wave of ambient noise opposite in phase to eliminate ambient noise.
The above embodiment of the present invention is applied to the feedback network of active noise reduction system, and application for mixing noise reduction system
One exemplary embodiment in the feedback network and feedforward path of active noise reduction system, the present invention in some other embodiments
Mixing noise reduction system can also be individually used in the feedforward path of active noise reduction system.
According to the present invention, analog filter is low pass filter, and the cut-off frequency of low pass filter is 10Hz.Such as Fig. 4 institutes
Showing the circuit diagram of the analog filter of one embodiment of the invention, low pass filter of the present invention is difference filter, including
First electric capacity C1, and the second electric capacity C2 in parallel with the first electric capacity C1, first electric capacity C1 one end connect AD by interface 503 and turned
Parallel operation positive pole, the positive pole of the other end (a ends) connection Noise Acquisition microphone 501.
Second electric capacity C2 one end connects a/d converter negative pole, the other end (b ends) connection Noise Acquisition Mike by interface 504
The negative pole of wind 501.Low pass filter also includes power supply, first resistor R1, the 3rd electric capacity C3 and the second resistance of series connection in embodiment
R2, second resistance R2 are connected to the negative pole of noise microphone 501.The circuit of series connection is accessed in power supply by power interface 502.
According to the present invention, digital filter is iir filter and/or FIR filter, and iir filter filters for straight line I types
Device or straight line II mode filters.The signal transmission of the IIR linear pattern digital filters of one embodiment of the invention as shown in Figure 5 is shown
It is intended to.The signal of another embodiment of the present invention Finite Impulse Response filter as shown in Figure 6 transmits schematic diagram.
It is provided by the invention a kind of for the simulating of active noise reduction, numeral mixing noise reduction system, to Noise Acquisition microphone
The noise of collection carries out analog electrical signal filtering first, to reduce requirement of the digital filter to resources of chip.To passing through simulation
Analog signal after filter process carries out digital filtering after being AD converted again, and the signal after mixed filtering is re-fed into
ANC noise signal phasing backs unit carries out active noise reduction.Provided by the present invention for the simulating of active noise reduction, numeral mixing drop
The system of making an uproar significantly reduces the dependence to chip hardware resource, while also ensure that the flexibility of active noise reduction, has master
The noise reduction of dynamic noise reduction.
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 (8)
- It is 1. a kind of for the simulating of active noise reduction, numeral mixing noise reduction system, it is characterised in that the system includes being sequentially connected Noise Acquisition microphone, analog filter, a/d converter, digital filter, ANC noise signal phasing backs unit, DA turn Parallel operation and player, whereinNoise Acquisition microphone, analog electrical signal is converted to for acquisition noise signal, and by the noise signal；Analog filter, receive the analog electrical signal and processing is filtered to the analog electrical signal；A/d converter, the analog electrical signal after analog filter filtering process is received, and be converted to data signal；Digital filter, receive the data signal and carry out digital filtering process；ANC noise signal phasing back units, the data signal after digital filter is handled carry out phasing back and obtain numeral Eliminate signal；D/A converter, the digital cancellation signal is converted into electric signal；Player, the electric signal is converted into the anti-phase sound wave of noise and played out.
- 2. mixing noise reduction system according to claim 1, it is characterised in that the mixing noise reduction system, which is arranged in, actively to drop The feedforward path for system of making an uproar and/or the feedback network of active noise reduction system.
- 3. mixing noise reduction system according to claim 1, it is characterised in that the analog filter is low pass filter.
- 4. mixing noise reduction system according to claim 3, it is characterised in that the cut-off frequency of the low pass filter is 10Hz。
- 5. the noise reduction system according to claim 3 or 4, it is characterised in that the low pass filter is difference filter bag The first electric capacity, and second electric capacity in parallel with first electric capacity are included, described first electric capacity one end connects a/d converter positive pole, The other end connects Noise Acquisition microphone positive pole；Described second electric capacity one end connects a/d converter negative pole, other end connection Noise Acquisition microphone negative pole.
- 6. noise reduction system according to claim 5, it is characterised in that the low pass filter also include series connection power supply, First resistor, the 3rd electric capacity and second resistance, the second resistance connect the noise microphone negative pole.
- 7. noise reduction system according to claim 1, it is characterised in that the digital filter be iir filter and/or FIR filter.
- 8. noise reduction system according to claim 7, it is characterised in that the iir filter is straight line I mode filters or straight Line II mode filters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710990205.2A CN107864419A (en) | 2017-10-23 | 2017-10-23 | It is a kind of for the simulating of active noise reduction, numeral mixing noise reduction system |
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| CN201710990205.2A CN107864419A (en) | 2017-10-23 | 2017-10-23 | It is a kind of for the simulating of active noise reduction, numeral mixing noise reduction system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109151635A (en) * | 2018-08-15 | 2019-01-04 | 恒玄科技（上海）有限公司 | Realize the automatic switchover system and method that active noise reduction and the outer sound of ear are picked up |
| CN109348362A (en) * | 2018-08-21 | 2019-02-15 | 恒玄科技（上海）有限公司 | A kind of bottom of eliminating is made an uproar the active noise reduction system and method for interference |
| CN111739505A (en) * | 2020-08-06 | 2020-10-02 | 江苏清微智能科技有限公司 | Active noise reduction system and method |
| WO2021022390A1 (en) * | 2019-08-02 | 2021-02-11 | 锐迪科微电子（上海）有限公司 | Active noise reduction system and method, and storage medium |
| CN112509549A (en) * | 2020-12-28 | 2021-03-16 | 重庆电子工程职业学院 | Active noise reduction method for ambient noise |
| CN113160841A (en) * | 2021-03-02 | 2021-07-23 | 广州朗国电子科技有限公司 | Digital noise reduction electronic circuit and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109151635A (en) * | 2018-08-15 | 2019-01-04 | 恒玄科技（上海）有限公司 | Realize the automatic switchover system and method that active noise reduction and the outer sound of ear are picked up |
| CN109348362A (en) * | 2018-08-21 | 2019-02-15 | 恒玄科技（上海）有限公司 | A kind of bottom of eliminating is made an uproar the active noise reduction system and method for interference |
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| CN112509549A (en) * | 2020-12-28 | 2021-03-16 | 重庆电子工程职业学院 | Active noise reduction method for ambient noise |
| CN112509549B (en) * | 2020-12-28 | 2022-08-05 | 重庆电子工程职业学院 | Active noise reduction method for ambient noise |
| CN113160841A (en) * | 2021-03-02 | 2021-07-23 | 广州朗国电子科技有限公司 | Digital noise reduction electronic circuit and electronic device |
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Inventor after: Xu Mingliang Inventor after: Yang Lei Inventor after: Zheng Like Inventor after: Huo Yunjie Inventor after: Tong Weifeng Inventor before: Xu Mingliang Inventor before: Yang Lei Inventor before: Zhou Jiaye Inventor before: Zheng Like Inventor before: Huo Yunjie Inventor before: Tong Weifeng |
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Address after: 201306 room 904, No. 800, Huanhu West 2nd Road, Lingang New Area, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Applicant after: Hengxuan Technology (Shanghai) Co., Ltd Address before: 200135 Shanghai 647 free trade pilot area, 171 Pudong New Area Road, 1 buildings, 6 rooms Applicant before: Heng Xuan Technology (Shanghai) Co., Ltd. |
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