CN206973651U - A kind of lampblack absorber of active active noise reduction - Google Patents
A kind of lampblack absorber of active active noise reduction Download PDFInfo
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- CN206973651U CN206973651U CN201720433995.XU CN201720433995U CN206973651U CN 206973651 U CN206973651 U CN 206973651U CN 201720433995 U CN201720433995 U CN 201720433995U CN 206973651 U CN206973651 U CN 206973651U
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- acoustical generator
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Abstract
A kind of lampblack absorber of active active noise reduction is the utility model is related to, including adopts acoustic device, sound-producing device, the described left and right sides adopted acoustic device and be distributed in range hood fan, sound-producing device is integrated at left and right sides of the lower section of range hood fan；Described acoustic device of adopting is formed by adopting acoustic device inner chamber, high frequency broadband noise sound absorption sponge and reference sensor；Described sound-producing device is made up of acoustical generator inner chamber, acoustical generator cover plate, acoustical generator high frequency sound absorption sponge and loudspeaker horn；Intracavitary is placed with ANC signals control acoustical generator, ANC signals control acoustical generator and reference sensor wired connection in the acoustical generator of described sound-producing device, and ANC signals control acoustical generator passes through D/A transform modes and loudspeaker horn wired connection；The utility model can effectively remove line spectrum noise in noise with low-frequency broadband noise, improve the sound quality of lampblack absorber.
Description
Technical field
The utility model belongs to lampblack absorber technical field, more particularly to a kind of lampblack absorber of active active noise reduction.
Background technology
The noise of lampblack absorber is caused by the operation and its vibration of blower fan, and wherein noise caused by blower fan has linear spectral and width
Characteristic with noise, for the noise of linear spectral, active active noise reduction is the only effective processing scheme.In addition, in sound
In terms of subjective feeling, the processing to linear spectral noise, the sound quality of noise of range hood can be improved.It is existing for lampblack absorber
Active active noise reduction scheme, general principle is simply elaborated with structure chart, not deep consideration is during noise reduction process
The linear general and interference problem of broadband noise, such as patent《Near-suction type oil smoke suction machine active noise reducing device and application have the device
Noise-reduction method》.Based on this, the active active noise reduction is designed, the active active noise reduction is primarily directed to low-frequency noise and frequency spectrum
In distribution it is linear it is general handled, during active noise elimination is carried out, active active noise reduction is in continuous wideband noise reduction algorithm
Realize difficult, effect also unobvious, avoid noise elimination influence of the broadband noise on linear spectral noise in noise source in acoustical generator, keep away
Exempt from reference sensor and receive reception influence of the sound middle width strip noise on linear spectral, therefore to the reality of the active active noise reduction scheme
Apply is based on the noise reduction schemes of low frequency and linear spectral in a kind of effectively elimination noise drawn up to the broadband noise in noise.
It is the effective ways for improving lampblack absorber sound quality.Active active noise reduction is to use anti-audio technology in the patent, in active vibration
In anti-audio technology and its eliminate influence of the wideband spectrum to linear spectral, and among protection domain.
In to the existing noise reduction measure of lampblack absorber, it is concentrated mainly on the optimization to noise source of generation blower fan and uses passively
Absorbed sound continuous two methods, and noise is handled from blower fan, in the case where not influenceing fan performance, noise reduction limitation, for using
Sound absorption is continuous, for the wideband spectrum positive effect such as high frequency, and low frequency and linear spectral noise, occupy in noise of range hood spectrum distribution
Greatly, therefore the processing to noise herein is, it is necessary to using active reduction method.In addition, for existing in lampblack absorber
On in scheme using active active noise reduction, do not account for the problem that interferes of linear spectral and broadband noise completely, and by
Have oil smoke generation in lampblack absorber use environment, do not account for how protecting yet reference microphone in active noise reduction, resonant cavity and
The fume pollution problem of generator.
The content of the invention
The purpose of this utility model is to overcome the shortcomings of the prior art, and provides a kind of oil of active active noise reduction
Cigarette machine, line spectrum noise in noise can be effectively removed with low-frequency broadband noise, improve the sound quality of lampblack absorber.
The purpose of this utility model is completed by following technical solution, including lampblack absorber main body, adopt acoustic device, hair
Acoustic device, control device, described lampblack absorber main body, including body and the blower fan in body；Described acoustic device of adopting is set
In in the body, it includes high frequency broadband noise sound absorption sponge and reference sensor, described high frequency broadband noise sound absorption sea
Silk floss is between the blower fan and reference sensor；For described sound-producing device in the body, it includes acoustical generator high frequency
Absorb sound sponge and loudspeaker horn, and described acoustical generator high frequency absorbs sound sponge between the blower fan and loudspeaker horn；Described
Respectively with reference sensor and loudspeaker horn Electricity Federation, it is raised control device by receiving the signal that reference sensor transmits to control
Horn sounding, to offset the low frequency noise of blower fan.
Preferably, the described left and right sides adopted acoustic device and be distributed in range hood fan, adopts the high frequency range in acoustic device
Band noise sound absorption sponge is embedded in and adopted in acoustic device inner chamber, reference sensor be located at high frequency broadband noise absorb sound behind sponge with
Between the panel of blower fan side.
Preferably, described acoustic device of adopting is towards offering for preventing oil smoke to high frequency range on the panel of blower fan side
The first aperture with noise sound absorption sponge pollution, the panel sealing backwards to blower fan side.
Preferably, described sound-producing device is integrated at left and right sides of the lower section of range hood fan, the hair in sound-producing device
Sound device high frequency sound absorption sponge is placed between acoustical generator cover plate and acoustical generator inner chamber, is put simultaneously in the ghost of the acoustical generator inner chamber
Acoustical generator high frequency sound absorption sponge is equipped with, loudspeaker horn is placed on the acoustical generator loudspeaker installation site that acoustical generator inner chamber both sides are provided with
Place is simultaneously located at after acoustical generator high frequency sound absorption sponge.
Preferably, described control device includes ANC signals control acoustical generator, ANC signals control acoustical generator and ginseng
Sensor wired connection is examined, ANC signals control acoustical generator passes through D/A transform modes and loudspeaker horn wired connection.
Preferably, described ANC signals control acoustical generator is located at intracavitary in the acoustical generator of sound-producing device.
It is used for preventing oil smoke from inhaling acoustical generator high frequency preferably, the both sides of described acoustical generator cover plate offer several
The second orifice of sound sponge pollution.
Preferably, the volume of described acoustical generator inner chamber is more than or equal to 1500cm3。
The beneficial effects of the utility model are：From the angle of practicality, the linear spectral and width in noise of range hood are considered
Band noise interferes and wideband ANC (active active noise reduction) algorithm constantly sex chromosome mosaicism, enters mainly for low frequency and linear spectral
Row noise reduction, it is therefore an objective to improve the sound quality of lampblack absorber, secondly, the reference sensor that uses of the present invention be it is a set of adopt acoustic device,
The device can effectively prevent influence of the oil smoke to parts in device, in the system with the broadband noise in filter high-frequency
In method, the generating means of inverted waveform is produced nor a simple loudspeaker horn, but the sounding with resonant cavity
Device, the device have filtered the broadband noise in loudspeaker horn generation sound high frequency, have only retained the linear spectral in low frequency and high frequency；
It is effective to solve reverse broadband noise and the interference problem of the linear sound field of source sound field in sound field using such device, avoid
Wideband ANC system system instability caused by constantly property is bad.
Brief description of the drawings
Fig. 1 is system installation structure schematic diagram of the present utility model.
Fig. 2 is sound-producing device structural representation of the present utility model.
Fig. 3 is of the present utility model to adopt acoustic device structural representation.
Fig. 4 is ANC feedforward control systems structural representation of the present utility model.
Fig. 5 is ANC feedforward control systems block diagram of the present utility model.
Fig. 6 is ANC hardware architecture diagrams of the present utility model.
Fig. 7 is ANC workflow diagrams of the present utility model.
Label in accompanying drawing is respectively：1st, acoustic device is adopted；2nd, sound-producing device；3rd, lampblack absorber；4th, reference sensor；5、ANC
Signal controls acoustical generator；6th, loudspeaker horn；11st, acoustic device inner chamber is adopted；12nd, high frequency broadband noise sound absorption sponge；13rd, first is small
Hole；21st, acoustical generator inner chamber；22 acoustical generator cover plates；23 acoustical generator high frequencies sound absorption sponge；24 acoustical generator loudspeaker installation sites；25th,
Two apertures.
Embodiment
Detailed introduction is done to the utility model below in conjunction with accompanying drawing：As shown in accompanying drawing 1 to 4, the utility model includes
Acoustic device 1, sound-producing device 2, the described left and right sides adopted acoustic device 1 and be distributed in the blower fan of lampblack absorber 3 are adopted, sound-producing device 2 integrates
At left and right sides of the lower section of the blower fan of lampblack absorber 3；Described adopts acoustic device 1 by adopting acoustic device inner chamber 11, high frequency broadband noise sound absorption
Sponge 12 and reference sensor 4 are formed, and high frequency broadband noise sound absorption sponge 12, which is embedded in, to be adopted in acoustic device inner chamber 11, with reference to sensing
Device 4 is located at behind high frequency broadband noise sound absorption sponge 12, i.e. high frequency broadband noise sound absorption sponge 12 and blower fan side backwards
Between panel, effect is to collect the voice signal for having filtered out high frequency broadband noise；Described sound-producing device 2 is by acoustical generator
Chamber 21, acoustical generator cover plate 22, acoustical generator high frequency sound absorption sponge 23 and loudspeaker horn 6 are formed, and loudspeaker horn 6 is placed in acoustical generator
At the acoustical generator loudspeaker installation site 24 that the both sides of chamber 21 are provided with and after acoustical generator high frequency sound absorption sponge 23, acoustical generator is high
Frequency sound absorption sponge 23 is placed between acoustical generator cover plate 22 and acoustical generator inner chamber 21, in the ghost of the acoustical generator inner chamber 21 simultaneously
Acoustical generator high frequency sound absorption sponge 23 is placed with to be used for filtering the high frequency broadband noise in acoustical generator.
Described control device includes ANC signals control acoustical generator 5, ANC signals control acoustical generator 5 and reference sensor
4 wired connections, ANC signals control acoustical generator 5 pass through D/A transform modes and the wired connection of loudspeaker horn 6；Described ANC signals
Control acoustical generator 5 is located in the acoustical generator inner chamber 21 of sound-producing device 2.
For described acoustic device 1 of adopting towards the first aperture 13 is offered on the panel of blower fan side, the side panel is sufficiently thin, keeps away
Exempt to form resonant cavity, the percent opening of the first aperture 13 can ensure that sound effectively gathers, and the panel main function is for preventing
Oil smoke absorbs sound the pollution of sponge to high frequency, and can be very good Oil Guide, the panel sealing backwards to blower fan side, barrier noise from
Lampblack absorber is spread out of.
The both sides of described acoustical generator cover plate 22 offer second orifice 25, and the second orifice 25 is sufficiently small, and depth is enough
It is thin, prevent from forming resonator, percent opening ensures 6 effective sounding of loudspeaker horn, and acoustical generator high frequency sound absorption sponge 23 is used for ensureing to raise
Horn 6 prevents fume pollution, as long as the both sides of acoustical generator cover plate 22 open second orifice 25 and prevent acoustical generator high frequency sound absorption sponge 23
By fume pollution, the purpose of acoustical generator inner chamber 21 is to improve the energy of sound, makes its effective sounding, volume is more than or equal to
1500cm33, disclosure satisfy that noise elimination requires with this acoustic energy for ensureing to send.
As shown in accompanying drawing 4,6, the main function of reference sensor 4 is acquisition noise signal, and by the acoustic signal of collection
Electric signal is converted into, ANC signals control acoustical generator 5 that the acoustic signal for being converted into electric signal after collection is carried out into after-treatment,
Linear spectral and broad band low frequency spectrum are extracted, carries out phase calculation, filtered signal is converted by D/A, is transmitted to sounding horn 6, is produced
Raw secondary sound source is eliminated the noise.The system is filtered using Fx-LMS algorithms, and the wave filter is classical active active noise reduction
Method.
As shown in Figure 5, the system uses feedforward system, and the main low-frequency broadband noise that handles is made an uproar with the linear spectral of full frequency band
Sound (high frequency broadband noise is absorbed by acoustical cotton).
As shown in Figure 7, in order to reduce the complexity of algorithm, the reference sensor 4 of left and right is numbered the system, leads to
The passage that numbering judges sound is crossed, is then calculated.Every calculator using the forwarding method, all it is the protection model of this patent
Enclose, secondly, the stability problem based on system of the invention, progress be broad band low frequency and linear spectral noise reduction, it is therefore an objective to dropping
Sound quality is improved on the basis of making an uproar, based on by noise of range hood linear spectral with the separated method of broadband noise, and this patent
Protection.
Invent above, the sound absorption sponge in resonant cavity, species does not limit, every side for adding sound absorption sponge in resonator
Method, it is the protection of this patent, sound absorption sponge does not limit.Outside resonant cavity plus sound absorption sponge is with grease proofing aperture, and protection model
Within enclosing.The design shape of resonator does not limit, as long as meeting that enough volumes are all right, so the shape of resonator does not limit,
The resonator of any shape, all it is within the protection domain of the patent as long as volume meets to require.Acoustic device is adopted, it is every in master
In dynamic noise reduction grease proofing aperture is installed additional using sound absorption sponge filter high frequency noise and outside, and within the scope of this patent.
Claims (8)
- A kind of 1. lampblack absorber of active active noise reduction, it is characterised in that：Including lampblack absorber main body, adopt acoustic device (1), sound-producing device (2), control device, described lampblack absorber main body, including body and the blower fan in body；Described acoustic device (1) of adopting is set In in the body, it includes high frequency broadband noise sound absorption sponge (12) and reference sensor (4), described high frequency broadband noise Sponge (12) absorb sound between the blower fan and reference sensor (4)；Described sound-producing device (2) is located in the body, It includes acoustical generator high frequency sound absorption sponge (23) and loudspeaker horn (6), and described acoustical generator high frequency sound absorption sponge (23) is located at institute State between blower fan and loudspeaker horn (6)；Described control device respectively with reference sensor (4) and loudspeaker horn (6) Electricity Federation, its Loudspeaker horn (6) sounding is controlled by receiving the signal of reference sensor (4) transmission, to offset the low frequency noise of blower fan.
- 2. the lampblack absorber of active active noise reduction according to claim 1, it is characterised in that：Described adopts acoustic device (1) point Cloth is adopted the sound absorption sponge of the high frequency broadband noise in acoustic device (1) (12) and is embedded in and adopt sound in the left and right sides of lampblack absorber (3) blower fan In device inner chamber (11), reference sensor (4) is located at behind high frequency broadband noise sound absorption sponge (12) and blower fan side backwards Panel between.
- 3. the lampblack absorber of active active noise reduction according to claim 2, it is characterised in that：Described adopts acoustic device (1) face Offered on to the panel of blower fan side for preventing first aperture of the oil smoke to high frequency broadband noise sound absorption sponge (12) pollution (13), backwards to the panel sealing of blower fan side.
- 4. the lampblack absorber of active active noise reduction according to claim 1, it is characterised in that：Described sound-producing device (2) collection Into at left and right sides of the lower section of lampblack absorber (3) blower fan, the acoustical generator high frequency sound absorption sponge (23) in sound-producing device (2) is placed on hair Between sound device cover plate (22) and acoustical generator inner chamber (21), acoustical generator height is placed with simultaneously in the ghost of the acoustical generator inner chamber (21) Frequency sound absorption sponge (23), loudspeaker horn (6) are placed on the acoustical generator loudspeaker installation site that acoustical generator inner chamber (21) both sides are provided with (24) place and after acoustical generator high frequency sound absorption sponge (23).
- 5. the lampblack absorber of active active noise reduction according to claim 1, it is characterised in that：Described control device includes ANC signals control acoustical generator (5), ANC signals control acoustical generator (5) and reference sensor (4) wired connection, ANC signal controls Acoustical generator (5) processed passes through D/A transform modes and loudspeaker horn (6) wired connection.
- 6. the lampblack absorber of active active noise reduction according to claim 5, it is characterised in that：Described ANC signals control hair Sound device (5) is located in the acoustical generator inner chamber (21) of sound-producing device (2).
- 7. the lampblack absorber of active active noise reduction according to claim 4, it is characterised in that：Described acoustical generator cover plate (22) Both sides offer several be used for prevent oil smoke to acoustical generator high frequency absorb sound sponge (23) pollution second orifice (25).
- 8. the lampblack absorber of active active noise reduction according to claim 4, it is characterised in that：Described acoustical generator inner chamber (21) Volume be more than or equal to 1500cm3。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720433995.XU CN206973651U (en) | 2017-04-24 | 2017-04-24 | A kind of lampblack absorber of active active noise reduction |
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| CN201720433995.XU CN206973651U (en) | 2017-04-24 | 2017-04-24 | A kind of lampblack absorber of active active noise reduction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107166458A (en) * | 2017-04-24 | 2017-09-15 | 杭州老板电器股份有限公司 | A kind of lampblack absorber of active active noise reduction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107166458A (en) * | 2017-04-24 | 2017-09-15 | 杭州老板电器股份有限公司 | A kind of lampblack absorber of active active noise reduction |
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