CN106535050A - Active noise reduction module eliminating automobile noise - Google Patents
Active noise reduction module eliminating automobile noise Download PDFInfo
- Publication number
- CN106535050A CN106535050A CN201611245614.1A CN201611245614A CN106535050A CN 106535050 A CN106535050 A CN 106535050A CN 201611245614 A CN201611245614 A CN 201611245614A CN 106535050 A CN106535050 A CN 106535050A
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- CN
- China
- Prior art keywords
- noise reduction
- noise
- module
- monitoring unit
- bluetooth
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
Abstract
The invention discloses an active noise reduction module eliminating automobile noise. The active noise reduction module includes a microphone pickup monitoring unit, an analysis noise reduction output chip, a loudspeaker, a wire interface, a Bluetooth module, a power supply and a control module. According to the active noise reduction with a wire capable of being inserted and pulled out, noise in an environment is monitored through the microphone pickup monitoring unit, a noise signal is transmitted to the analysis noise reduction output chip, after operation analysis of the analysis noise reduction output chip, a noise reduction signal instruction is sent out, and the loudspeaker sends out sound waves which are opposite to noise in phase and are the same as noise in amplitude to counteract noise. The problem of low frequency noise is effectively solved, the tone quality can be improved, the characteristics of being small and exquisite and flexible, and being started for use at any time are achieved, and through adoption of a low power consumption technical scheme, very long standby time can be realized.
Description
Technical field
The present invention relates to acoustic noise reduction technical field, specially a kind of active noise reduction module for eliminating car noise.
Background technology
Modern society is with life, work rhythm quickening increasingly so that people are required in work, study, rest
More quiet comfortable environment, therefore noise pollution has become the factor for affecting people's quality of life main, in noise pollution
It is increasingly serious that people can only stand noise, and physical and mental health is impacted, and then people begin look for noise reduction measure instantly,
Such as passive noise reduction, i.e., using the physical material shielding noise that quality is higher, soundproof effect is better, this method is only to altofrequency
Sound is effective, it is impossible to reduce low frequency noise, and noise reduction capability is only capable of reducing about 10 five to two ten decibels, relatively costly.
Noise is isolated to a certain extent by traditional noise reduction mode mainly by good seal and material behavior.Passively
Noise reduction typically can only be for the sound of more than 500Hz higher frequencies, and especially for the noise in more than 1KHz, passive noise reduction has one
Fixed noise reduction capability, but more preferable noise reduction is gone for, and low frequency noise is processed, then need to pay greatly
Material engineering cost.Active noise reduction is combined with acoustics and electricity is theoretical, using the method for the anti-phase cancellation of Active noise, passes through
Active noise reduction module is installed in cavity, is detected noise and amplitude same phase therewith is produced by noise reduction module drive the speaker
Contrary sound wave is offseted therewith, so as to realize good noise reduction.
The content of the invention
For above-mentioned weak point of the prior art, the invention provides a kind of active noise reduction mould for eliminating car noise
Block, solves the problems, such as the low-frequency noise described in background technology, ensures enough continuation of the journey duration using Low-power Technology, with
It is with opening, compact portable.
For realizing above-mentioned technique effect, the technical solution used in the present invention is a kind of active noise reduction mould for eliminating car noise
Block, including housing, it is characterised in that：Enclosure interior is provided with mike pickup monitoring unit, parsing noise reduction pio chip, raises one's voice
Device, wire interface, bluetooth module, power supply and control module；The mike pickup monitoring unit exports core by parsing noise reduction
Piece is connected with speaker, bluetooth and control module respectively, and the parsing noise reduction pio chip is single with the monitoring of mike pickup respectively
The connection of unit, speaker, wire interface, bluetooth module, power supply and control module, the speaker are monitored with mike pickup respectively
Unit, parsing noise reduction pio chip, wire interface, bluetooth module, power supply and control module connection, the wire interface respectively with
Mike pickup monitoring unit, parsing noise reduction pio chip, speaker, bluetooth and control module connection, the bluetooth module, electricity
Source and control module are connected with mike pickup monitoring unit, parsing noise reduction pio chip, speaker, wire interface respectively.
The active noise reduction of the pluggable line, by the noise in mike pickup monitoring unit monitors environment, noise is believed
Parsing noise reduction pio chip number is reached, de-noising signal instruction is sent Jing after parsing noise reduction pio chip operational analysis, by speaker
Send with noise opposite in phase, amplitude identical sound wave to offset noise.Low frequency noise is efficiently solved the problems, such as, can be lifted
Tonequality, with compact and flexible, the characteristics of with opening, by having very long stand-by time using Low-power Technology scheme.It is blue
Tooth module is included on circuit board, it is possible to provide audio signal when wirelessly wearing is by player (as being equipped with the handss of Bluetooth function
Machine) transmission arrived.
Preferably, the wire interface freely can be plugged, i.e., can work under wireless status and cable status.
Preferably, the noise reduction is capable of identify that background noise and sends identical with background noise amplitude, opposite in phase
Reversely acoustical signal carries out counteracting neutralization.
Preferably, bluetooth module by way of bluetooth connection is attached and is operated.
Preferably, the control module can be operated by way of button and remote control.
Preferably, the power module is common to directly power supply and battery.
Further, described also to include charging panel, charging panel is embedded on housing, can be connected charging wire by charging inlet and be given
Power source charges in cavity.
Further, wired multi-tap is set below housing, and user can connect wired audition in the case of battery short of electricity
It is happy.When wirelessly wearing, decrease of noise functions can be opened and listened music or isolated outside noise separately as noise reduction.
Compared with feed forward type structure, reaction type active noise reduction structure needs the position to mike and speaker more accurately
Calculate.The distance of mike and speaker affects very big to the noise reduction of system.The distance between mike and speaker are led
Phase contrast between the noise signal that the noise signal and speaker that cause mike is received is played back, and phase contrast is with sound frequency
Raise and increase, once phase contrast is more than 60 degree, negative feedback will become positive feedback, be readily incorporated.
The present invention adopts a kind of Dolby circuit filter design method model based on feed forward type structure：Noise is from by mike
Capture and pass through signal processing to pass to auditory meatus again and must be consistent from outside through incoming auditory meatus again with noise to loudspeaker playback.
By the transfer function (referred to as " biography letter ") of measure ambient noise to human ear, the biography letter of noise to mike is raised one's voice
Biography letter of the device to human ear, then by the biography letter and speaker of noise to mike are penetrated to the biography letter antiphase of human ear with noise
The biography letter for reaching human ear subtracts each other, that is, obtain the biography letter data model of Dolby circuit filtering.By these measurements, noise reduction can be designed
The wave filter of circuit, with circuit compensation due to caused decay and time delay, this causes system to be able to produce into anti-phase noise signal,
The noise that rear human ear is really heard is penetrated for offsetting.
Compared with prior art, by the noise in mike pickup monitoring unit monitors environment, noise signal is reached
Parsing noise reduction pio chip, Jing parsing noise reduction pio chip operational analysis after send de-noising signal instruction, by speaker send with
Noise opposite in phase, amplitude identical sound wave are offsetting noise.The active noise reduction of the pluggable line, efficiently solves soundproof effect
The poor problem of limited and acoustical quality, can lift tonequality, with compact and flexible, the characteristics of with opening, by using low work(
Consumption technical scheme can have very long stand-by time.
Description of the drawings
Fig. 1 is present configuration block diagram；
Fig. 2 is the denoising structure schematic diagram of the present invention；
Fig. 3 is the denoising structure schematic diagram of the present invention；
Fig. 4 is Dolby circuit filter design method model；
Fig. 5 is sound Bode diagram.
In figure：1 mike pickup monitoring unit, 2 parsing noise reduction pio chips, 3 speakers, 4 wire interfaces, 5 bluetooth moulds
Block, 6 control modules, 7 power modules.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1-3 are referred to, the present invention provides a kind of technical scheme：A kind of active noise reduction module for eliminating car noise, institute
State
Module 5, control module 6 and power module 7.The mike pickup monitoring unit 1 by parse noise reduction pio chip 2 respectively with
Speaker 3, bluetooth 5 and control module connection 6, the parsing noise reduction pio chip 2 respectively with mike pickup monitoring unit 1,
Speaker 3, wire interface 4, bluetooth module 5, control module 6 and power module 7 connect, the speaker 3 respectively with mike
Pickup monitoring unit 1, parsing noise reduction pio chip 2, wire interface 4, bluetooth module 5, control module 6 and power module 7 connect,
The wire interface 4 respectively with mike pickup monitoring unit 1, parsing noise reduction pio chip 2, speaker 3, bluetooth module 5, control
Molding block 6 and power module 7 connect, and the bluetooth module 5, control module 6 and power module 7 are monitored with mike pickup respectively
Unit 1, parsing noise reduction pio chip 2, speaker 3, wire interface 4 connect.
Operation principle：The real-time noise information for monitoring is communicated to parsing noise reduction output by mike pickup monitoring unit 1
Chip 2, after parsing noise reduction pio chip 2 is to noise parsing, transmission order makes speaker 3 send the sound contrary with noise waveform
Ripple；Wire interface 4 senses the state of interface, data is communicated to parsing noise reduction pio chip 2 and bluetooth module 5 and is sent with cooperateing with
Noise reduction is instructed to speaker 3.
Dolby circuit filter design method model as shown in Figure 4：
Bionical human ear 16 (hereinafter referred to as " human ear "), when active noise reduction is not opened, in passive noise reduction state, a noise
Source NS sends noise through air, and auditory meatus are communicated to human ear, at human ear detects sound waveform herein with sound testing instrument
Data ES, so transfer function H 0S=ES-NS of the noise source to human ear；When opening active noise reduction, it is embedded in away from ear chamber
Mike receives noise signal AS herein, and the transmission function of noise source to mike is H1S=AS-NS；The AS that mike is received
Input signal of the signal as the Dolby circuit of connection mike, by reason speaker output signal BS at Dolby circuit, drops
Transfer function H 2S=BS-AS of noise cancellation circuit；Speaker is internally positioned near at ear chamber, and the signal of output is reached by auditory meatus
Human ear, the signal that human ear is detected are E (- S), transfer function H 3S=E (- the S)-BS of speaker to human ear；To reach at human ear
To noise cancellation effect, then speaker output need to be passed through with noise by signal E (- S) that auditory meatus reach human ear and be delivered to human ear
Signal NS, amplitude same phase is conversely, be designated as E (- S)=- ES.Thus, transfer function H 2S of Dolby circuit filtering can be calculated
=-H0S-H1S-H3S, wherein, ES is transmission function of the noise to human ear, and H1S is transfer function of the noise to outside mike,
H3S is transmission function of the speaker to human ear.According to detecting and transfer function H 2S that calculates is designing noise reduction filtering circuit.
Embodiments of the invention can have two kinds to wear setting, and one kind is to open active noise reduction function, and another kind is to close
Active noise reduction function only has passive noise reduction.
As shown in the Bode diagram of Fig. 5,80dB very noisies 12 are received, when not opening active noise reduction function, noise source is to human ear
16 actually measured transfer function is curve 13, and when opening active noise reduction function, noise source is by L channel to human ear 16
Actually measured transfer function is curve 14, and noise source is bent by the actually measured transfer function that R channel reaches human ear 16
Line 15.The low-frequency range once in 1kHz can be seen, the noise 13 or 14 obtained at the human ear 16 when opening active noise reduction function
15 to 20dB reduce during active noise reduction than not being opened, active noise reduction effect is significant.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (7)
1. it is a kind of eliminate car noise active noise reduction module, including housing, it is characterised in that：Enclosure interior is provided with mike
Pickup monitoring unit, parsing noise reduction pio chip, speaker, wire interface, bluetooth module, power supply and control module；The wheat
Gram wind pickup monitoring unit is connected with speaker, bluetooth and control module respectively by parsing noise reduction pio chip, the parsing
Noise reduction pio chip respectively with mike pickup monitoring unit, speaker, wire interface, bluetooth module, power supply and control module
Connection, the speaker respectively with mike pickup monitoring unit, parsing noise reduction pio chip, wire interface, bluetooth module, electricity
Source and control module connection, the wire interface respectively with mike pickup monitoring unit, parsing noise reduction pio chip, raise one's voice
Device, bluetooth and control module connection, the bluetooth module, power supply and control module respectively with mike pickup monitoring unit, solution
Analysis noise reduction pio chip, speaker, wire interface connection.
2. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：The wire rod connects
Mouth freely can be plugged, i.e., wireless to work with cable status.
3. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：The noise reduction energy
The reverse acoustical signal for enough recognizing background noise and sending, opposite in phase identical with background noise amplitude carries out counteracting neutralization.
4. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：The bluetooth mould
Block by way of bluetooth connection is attached and is operated.
5. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：The control mould
Block can be operated by way of button and remote control.
6. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：The power supply mould
Block is common to directly power supply and battery.
7. it is according to claim 1 it is a kind of eliminate car noise active noise reduction module, it is characterised in that：It is described also to include
Charging panel, charging panel are embedded on housing, can connect charging wire to the power source charges in cavity by charging inlet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610697741 | 2016-08-20 | ||
| CN2016106977419 | 2016-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106535050A true CN106535050A (en) | 2017-03-22 |
Family
ID=58338460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611245614.1A Pending CN106535050A (en) | 2016-08-20 | 2016-12-29 | Active noise reduction module eliminating automobile noise |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107045778A (en) * | 2017-04-26 | 2017-08-15 | 兰州交通大学 | A kind of Multifunctional noise bucking-out system |
| CN108301895A (en) * | 2017-12-25 | 2018-07-20 | 重庆达德机械制造有限公司 | A kind of elimination noise automobile exhaust pipe |
| CN108376542A (en) * | 2018-04-19 | 2018-08-07 | 广东万家乐燃气具有限公司 | A kind of gas heater of active noise reduction |
| CN109166567A (en) * | 2018-10-09 | 2019-01-08 | 安徽信息工程学院 | A kind of noise-reduction method and equipment |
| CN109949790A (en) * | 2019-03-13 | 2019-06-28 | 姚天扬 | Active noise reduction system in feed forward type room |
| CN110942762A (en) * | 2019-12-06 | 2020-03-31 | 苏州市华音电子科技有限公司 | Control method and system for performing frequency-band noise elimination on vehicle |
| CN112514416A (en) * | 2018-08-02 | 2021-03-16 | 日本电信电话株式会社 | Sound pickup and amplification device, method thereof, and program |
| CN112614501A (en) * | 2020-12-08 | 2021-04-06 | 深圳创维－Rgb电子有限公司 | Noise reduction method, noise reduction apparatus, noise canceller, microphone, and readable storage medium |
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| US20090086988A1 (en) * | 2007-09-28 | 2009-04-02 | Foxconn Technology Co., Ltd. | Noise reduction headsets and method for providing the same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107045778A (en) * | 2017-04-26 | 2017-08-15 | 兰州交通大学 | A kind of Multifunctional noise bucking-out system |
| CN108301895A (en) * | 2017-12-25 | 2018-07-20 | 重庆达德机械制造有限公司 | A kind of elimination noise automobile exhaust pipe |
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| CN108376542A (en) * | 2018-04-19 | 2018-08-07 | 广东万家乐燃气具有限公司 | A kind of gas heater of active noise reduction |
| CN112514416A (en) * | 2018-08-02 | 2021-03-16 | 日本电信电话株式会社 | Sound pickup and amplification device, method thereof, and program |
| CN112514416B (en) * | 2018-08-02 | 2022-06-07 | 日本电信电话株式会社 | Sound pickup and amplification device, method thereof, and recording medium |
| CN109166567A (en) * | 2018-10-09 | 2019-01-08 | 安徽信息工程学院 | A kind of noise-reduction method and equipment |
| CN109949790A (en) * | 2019-03-13 | 2019-06-28 | 姚天扬 | Active noise reduction system in feed forward type room |
| CN110942762A (en) * | 2019-12-06 | 2020-03-31 | 苏州市华音电子科技有限公司 | Control method and system for performing frequency-band noise elimination on vehicle |
| CN112614501A (en) * | 2020-12-08 | 2021-04-06 | 深圳创维－Rgb电子有限公司 | Noise reduction method, noise reduction apparatus, noise canceller, microphone, and readable storage medium |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180517 Address after: 312000 Yueling Township, Yuecheng Township, Yuecheng Town, Shaoxing, Zhejiang Applicant after: Shaoxing Shengyang Electrical Appliance Co., Ltd. Address before: 100000 Beijing Haidian District Haidian Avenue 34, Hai Ting venture capital building 7 floor - Zhong Sheng Technology Applicant before: China sound technology (Beijing) Co., Ltd. |
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Application publication date: 20170322 |
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