CN106740332A - A kind of active eliminates the automobile headrest of in-car noise - Google Patents
A kind of active eliminates the automobile headrest of in-car noise Download PDFInfo
- Publication number
- CN106740332A CN106740332A CN201611248798.7A CN201611248798A CN106740332A CN 106740332 A CN106740332 A CN 106740332A CN 201611248798 A CN201611248798 A CN 201611248798A CN 106740332 A CN106740332 A CN 106740332A
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- China
- Prior art keywords
- noise
- noise reduction
- loudspeaker
- eliminates
- parsing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
- B60N2/879—Head-rests with additional features not related to head-rest positioning, e.g. heating or cooling devices or loudspeakers
-
- 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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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
It is described including microphone pickup monitoring unit, parsing noise reduction pio chip, loudspeaker, wire interface, bluetooth module, power supply and control module the invention discloses the automobile headrest that a kind of active eliminates in-car noise.The active noise reduction of the pluggable line, by the noise in microphone pickup monitoring unit monitors environment, noise signal is reached into parsing noise reduction pio chip, de-noising signal is sent after parsing noise reduction pio chip operational analysis to instruct, and is sent with noise opposite in phase, amplitude identical sound wave to offset noise by loudspeaker.Low frequency noise is efficiently solved the problems, such as, tonequality can be lifted, with compact and flexible, the characteristics of with opening, there can be stand-by time very long by using Low-power Technology scheme.
Description
Technical field
The present invention relates to acoustic noise reduction technical field, specially a kind of active eliminates the automobile headrest of in-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 main factor of influence people's quality of life, 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 high-frequency
Sound is effective, it is impossible to reduce low frequency noise, and noise reduction capability is only capable of about 15 to 20 decibels of reduction, relatively costly.
Traditional noise reduction mode to a certain extent isolates noise mainly by good seal and material property.Passively
Noise reduction can only typically be directed to 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
Opposite 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 the automobile-used head that a kind of active eliminates in-car noise
Pillow, solves the problems, such as the low-frequency noise described in background technology, and enough continuation of the journey duration is ensured using Low-power Technology, with
It is compact portable with opening.
To realize above-mentioned technique effect, the technical solution adopted by the present invention is the automobile-used head that a kind of active eliminates in-car noise
Pillow, including housing, it is characterised in that：Enclosure interior is provided with microphone pickup monitoring unit, parsing noise reduction pio chip, raises one's voice
Device, wire interface, bluetooth module, power supply and control module；The microphone pickup monitoring unit exports core by parsing noise reduction
Piece is connected with loudspeaker, bluetooth and control module respectively, and the parsing noise reduction pio chip monitors single with microphone pickup respectively
Unit, loudspeaker, wire interface, bluetooth module, power supply and control module connection, the loudspeaker are monitored with microphone pickup respectively
Unit, parsing noise reduction pio chip, wire interface, bluetooth module, power supply and control module connection, the wire interface respectively with
Microphone pickup monitoring unit, parsing noise reduction pio chip, loudspeaker, bluetooth and control module connection, the bluetooth module, electricity
Source and control module are connected with microphone pickup monitoring unit, parsing noise reduction pio chip, loudspeaker, wire interface respectively.
The active noise reduction of the pluggable line, by the noise in microphone pickup monitoring unit monitors environment, noise is believed
Parsing noise reduction pio chip number is reached, de-noising signal is sent after parsing noise reduction pio chip operational analysis and is instructed, by loudspeaker
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, can have stand-by time very long by 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 the player (hand as being equipped with Bluetooth function
Machine) transmission arrived.
Preferably, the wire interface can be plugged freely, i.e., can be worked under wireless status and cable status.
Preferably, the noise reduction is capable of identify that ambient noise and sends identical with ambient noise amplitude, opposite in phase
Reverse acoustical signal carries out counteracting neutralization.
Preferably, bluetooth module is attached and is operated by way of bluetooth connection.
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, housing lower section sets wired multi-tap, and user can connect wired audition in the case of battery short of electricity
It is happy.In wireless 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 is needed to the position of microphone and loudspeaker more accurately
Calculate.Noise reduction influence of the distance of microphone and loudspeaker on system is very big.The distance between microphone and loudspeaker are led
The phase difference between the noise signal that microphone is received and the noise signal that loudspeaker is played back is caused, and phase difference is with sound frequency
Raise and increase, once phase difference is more than 60 degree, negative-feedback will become positive feedback, be readily incorporated serious noise of uttering long and high-pitched sounds.
The present invention uses a kind of Dolby circuit filter design method model based on feed forward type structure：Noise is from by microphone
Capturing and pass to duct again to loudspeaker playback by signal transacting must be consistent with noise from outside through incoming duct again.
By the transfer function (referred to as " biography letter ") of measure ambient noise to human ear, the biography letter of noise to microphone is raised one's voice
Device then is penetrated to the biography letter antiphase of human ear by the biography letter and loudspeaker of noise to microphone to the biography letter 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.Measured by these, noise reduction can be designed
The wave filter of circuit, decay and time delay with circuit compensation caused by, this causes that system is able to produce into anti-phase noise signal,
The real noise heard of rear human ear is penetrated for offsetting.
Compared with prior art, by the noise in microphone pickup monitoring unit monitors environment, noise signal is reached
Parsing noise reduction pio chip, through parse noise reduction pio chip operational analysis after send de-noising signal instruct, by loudspeaker send with
Noise opposite in phase, amplitude identical sound wave offset 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 stand-by time very long.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention；
Fig. 2 is denoising structure schematic diagram of the invention；
Fig. 3 is denoising structure schematic diagram of the invention；
Fig. 4 is Dolby circuit filter design method model；
Fig. 5 is sound Bode diagram.
In figure：1 microphone pickup monitoring unit, 2 parsing noise reduction pio chips, 3 loudspeakers, 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 whole embodiments.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 eliminates the automobile headrest of in-car noise, institute
State and be provided with inside noise reduction microphone pickup monitoring unit 1, parsing noise reduction pio chip 2, loudspeaker 3, wire interface 4, bluetooth
Module 5, control module 6 and power module 7.The microphone pickup monitoring unit 1 by parse noise reduction pio chip 2 respectively with
Loudspeaker 3, bluetooth 5 and control module connection 6, the parsing noise reduction pio chip 2 respectively with microphone pickup monitoring unit 1,
Loudspeaker 3, wire interface 4, bluetooth module 5, control module 6 and power module 7 are connected, the loudspeaker 3 respectively with microphone
Pickup monitoring unit 1, parsing noise reduction pio chip 2, wire interface 4, bluetooth module 5, control module 6 and power module 7 are connected,
The wire interface 4 respectively with microphone pickup monitoring unit 1, parsing noise reduction pio chip 2, loudspeaker 3, bluetooth module 5, control
Molding block 6 and power module 7 are connected, and the bluetooth module 5, control module 6 and power module 7 are monitored with microphone pickup respectively
Unit 1, parsing noise reduction pio chip 2, loudspeaker 3, wire interface 4 are connected.
Operation principle：The real-time noise information that microphone pickup monitoring unit 1 will be monitored is communicated to parsing noise reduction output
Chip 2, after parsing noise reduction pio chip 2 is parsed to noise, transmission order makes loudspeaker 3 send the sound opposite with noise waveform
Ripple；Wire interface 4 senses the state of interface, and data are communicated into parsing noise reduction pio chip 2 and bluetooth module 5 is sent with cooperateing with
Noise reduction is instructed to loudspeaker 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 and is communicated to human ear by air, and duct, and sound waveform herein is detected with sound testing instrument at human ear
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
Microphone receives noise signal AS herein, and the transmission function of noise source to microphone is H1S=AS-NS；The AS that microphone is received
Signal, by reason speaker output signal BS at Dolby circuit, drops as the input signal of the Dolby circuit of connection microphone
The transfer function H 2S=BS-AS of noise cancellation circuit；Loudspeaker is internally positioned near at ear chamber, and the signal of output is reached by duct
Human ear, the signal that human ear is detected is E (- S), transfer function H 3S=E (- S)-BS of loudspeaker to human ear；To be reached at human ear
To noise cancellation effect, then loudspeaker output need to be passed through with noise by signal E (- S) that duct reaches human ear and be delivered to human ear
Signal NS, amplitude same phase is conversely, be designated as E (- S)=- ES.Thus, the 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 microphone,
H3S is transmission function of the loudspeaker to human ear.Noise reduction filtering circuit is designed according to the transfer function H 2S for detecting and calculating.
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 is only passive noise reduction.
As shown in the Bode diagram of Fig. 5,80dB very noisies 12, when not opening active noise reduction function, noise source to human ear are received
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.It can be seen that the low-frequency range in 1kHz once, the noise 13 or 14 obtained at the human ear 16 when opening active noise reduction function
Reduced during active noise reduction 15 to 20dB, active noise reduction effect is significant than not opening.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, 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. a kind of active eliminates the automobile headrest of in-car noise, including housing, it is characterised in that：Enclosure interior is provided with microphone
Pickup monitoring unit, parsing noise reduction pio chip, loudspeaker, wire interface, bluetooth module, power supply and control module；The wheat
Gram wind pickup monitoring unit is connected with loudspeaker, bluetooth and control module respectively by parsing noise reduction pio chip, the parsing
Noise reduction pio chip respectively with microphone pickup monitoring unit, loudspeaker, wire interface, bluetooth module, power supply and control module
Connection, the loudspeaker respectively with microphone pickup monitoring unit, parsing noise reduction pio chip, wire interface, bluetooth module, electricity
Source and control module are connected, the wire interface respectively with microphone 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 microphone pickup monitoring unit, solution
Analysis noise reduction pio chip, loudspeaker, wire interface connection.
2. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：The wire rod connects
Mouth can be plugged freely, i.e., wireless to be worked with cable status.
3. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：The noise reduction energy
Enough recognizing ambient noise and sending reverse acoustical signal identical with ambient noise amplitude, opposite in phase carries out counteracting neutralization.
4. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：The bluetooth mould
Block is attached and is operated by way of bluetooth connection.
5. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：The control mould
Block can be operated by way of button and remote control.
6. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：The power supply mould
Block is common to directly power supply and battery.
7. a kind of active according to claim 1 eliminates the automobile headrest of in-car noise, it is characterised in that：It is described also to include
Charging panel, charging panel is 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 |
|---|---|---|---|
| CN2016106977194 | 2016-08-20 | ||
| CN201610697719 | 2016-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106740332A true CN106740332A (en) | 2017-05-31 |
Family
ID=58927795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611248798.7A Pending CN106740332A (en) | 2016-08-20 | 2016-12-29 | A kind of active eliminates the automobile headrest of in-car noise |
Country Status (1)
| Country | Link |
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| CN (1) | CN106740332A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111508463A (en) * | 2019-01-30 | 2020-08-07 | 保时捷股份公司 | Method for actively reducing noise in an electric or hybrid vehicle and correspondingly equipped vehicle |
| CN112874400A (en) * | 2019-11-29 | 2021-06-01 | 佛吉亚汽车座椅公司 | Noise-cancelling headrest for vehicle seat |
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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 |
| CN201854396U (en) * | 2010-10-29 | 2011-06-01 | 大连海事大学 | Head-wearing noise reduction earphone |
| CN102404468A (en) * | 2011-10-27 | 2012-04-04 | 康佳集团股份有限公司 | Method and system for controlling automobile by applying mobile phone voice |
| CN203761556U (en) * | 2013-11-25 | 2014-08-06 | 香港丰成有限公司 | Double-microphone noise reduction earphone |
| CN204350277U (en) * | 2015-01-21 | 2015-05-20 | 彭庭轩 | A kind of indoor active noise reduction equipment of streamlined Wireless Networking |
-
2016
- 2016-12-29 CN CN201611248798.7A patent/CN106740332A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090086988A1 (en) * | 2007-09-28 | 2009-04-02 | Foxconn Technology Co., Ltd. | Noise reduction headsets and method for providing the same |
| CN201854396U (en) * | 2010-10-29 | 2011-06-01 | 大连海事大学 | Head-wearing noise reduction earphone |
| CN102404468A (en) * | 2011-10-27 | 2012-04-04 | 康佳集团股份有限公司 | Method and system for controlling automobile by applying mobile phone voice |
| CN203761556U (en) * | 2013-11-25 | 2014-08-06 | 香港丰成有限公司 | Double-microphone noise reduction earphone |
| CN204350277U (en) * | 2015-01-21 | 2015-05-20 | 彭庭轩 | A kind of indoor active noise reduction equipment of streamlined Wireless Networking |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111508463A (en) * | 2019-01-30 | 2020-08-07 | 保时捷股份公司 | Method for actively reducing noise in an electric or hybrid vehicle and correspondingly equipped vehicle |
| CN112874400A (en) * | 2019-11-29 | 2021-06-01 | 佛吉亚汽车座椅公司 | Noise-cancelling headrest for vehicle seat |
| CN112874400B (en) * | 2019-11-29 | 2023-07-28 | 佛吉亚汽车座椅公司 | Noise-canceling headrest for vehicle seat |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180528 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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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |