CN105455384A - Method and device for reducing noise of electric hair drier and electric hair drier - Google Patents
Method and device for reducing noise of electric hair drier and electric hair drier Download PDFInfo
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- CN105455384A CN105455384A CN201410847622.8A CN201410847622A CN105455384A CN 105455384 A CN105455384 A CN 105455384A CN 201410847622 A CN201410847622 A CN 201410847622A CN 105455384 A CN105455384 A CN 105455384A
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Abstract
The invention provides a method and device for reducing the noise of an electric hair drier and the electric hair drier. The method and device for reducing the noise of the electric hair drier and the electric hair drier are designed for solving the problem that noise can not be well suppressed by an existing method and device. The method for reducing the noise of the electric hair drier includes a passive noise reduction method and an active noise reduction method. The passive noise reduction method includes the step that an electric heating radiation plate structure device is arranged in an air duct of the electric hair drier, and therefore obstruction in the air duct is avoided or is small so that the noise generated by air ventilation can be reduced; the electric heating radiation plate structure device comprises a heating unit, a work surface unit and a heat insulation unit. The active noise reduction method includes the steps that a rotating speed-antiphase sound wave database is prestored in a noise reduction device, the noise reduction device inquires the database according to the rotating speed of the electric hair drier to obtain initial antiphase sound waves, and a playing unit carries out playing according to the initial antiphase sound waves to suppress noise; the active noise reduction device comprises a control unit, an obtaining unit, a storage unit and the playing unit, wherein the obtaining unit, the storage unit and the playing unit are connected with the control unit. A passive noise reduction device and the active noise reduction device are installed on the electric hair drier.
Description
Technical field
The present invention relates to a kind of hair dryer noise-reduction method, device and hair dryer.
Background technology
Hair dryer is used to a kind of small household appliance of hair dryer, also can be used for that laboratory, psyciotherapy room and industrial aspect are dry, the use of heating and physiotherapy.Along with the improvement of technology and the raising of the level of consumption, the use of this compact electric apparatus in life is more and more extensive.Current hair dryer mainly contains shell, heating wire, the formations such as fan, and heating wire and fan are arranged on enclosure, and wherein heating wire is placed in the ventilating duct in shell, and fan is arranged on heating wire rear.After hair dryer switches on power, electrothermal wire heating also keeps the condition of high temperature, and motor-driven fan rotates, and is sucked by air from air inlet, through electric-heating-wire-heating, blows out after forming hot blast from air outlet.Heating wire is directly placed in high velocity air makes air flow disturbance large, and eddy current is serious and regeneration noise is large.The reasons such as wind cutting and air owing to rotating generation when the electromagnetism sound of machine operation and fan work in hair dryer running are hampered in body can produce larger noise.And near head when using hair dryer, therefore large noise can cause harmful effect to head and ear-drum.Current reduction hair dryer noise is main or passive type, namely by adopting aerodynamic method to be optimized or to adopt the motor of low noise also or use sound insulation and sound-absorbing material etc. to reach noise reduction object to fan etc., but above-mentioned noise reduction is not fairly obvious.
Summary of the invention
For prior art above shortcomings:
An object of the present invention is to propose the more efficiently hair dryer noise-reduction method of a kind of restraint speckle.
It is little of the passive denoising device reducing the noise that air circulation produces and the hair dryer active noise reducing device of antiphase sound wave can playing restraint speckle in time that another object of the present invention is to provide a kind of accessible or obstacle of ventilating duct that makes.
Another object of the present invention is to provide a kind of washing machine of low noise.
For reaching this object, on the one hand, the present invention is by the following technical solutions:
A kind of hair dryer noise-reduction method, comprise the passive noise-reduction method of hair dryer and active denoising method, described passive noise-reduction method is hair dryer ventilating duct is provided with electric radiation plank frame device make the accessible or obstacle of hair dryer ventilating duct little of to reduce the noise that air circulation produces; Described active denoising method comprises the following steps: A, in denoising device, at least prestore the rotating speed-antiphase sonic data storehouse of the rotating speed of reflection hair dryer and the antiphase sound wave corresponding relation in order to offset hair dryer work noise under this rotating speed; B, denoising device inquire about described database according to the hair dryer rotating speed of Real-time Obtaining, at least obtain initial antiphase sound wave; C, carry out broadcasting by broadcast unit according to this initial antiphase sound wave and carry out restraint speckle.
Particularly in active denoising method, after execution of step C, the antiphase sound wave of the superposition sound wave after execution following steps C1, broadcast unit superpose with initial antiphase sound wave according to hair dryer operating noise under this rotating speed carries out broadcasting and suppresses noise further.
Particularly active denoising method: described database is the antiphase sonic data storehouse of the rotating speed-antiphase sound wave-superposition sound wave of the antiphase sound wave corresponding relation of superposition sound wave after the rotating speed including reflection hair dryer superposes with initial antiphase sound wave with hair dryer operating noise under the antiphase sound wave in order to offset hair dryer operating noise under this rotating speed and this rotating speed in step; Denoising device inquires about described database according to the hair dryer rotating speed of Real-time Obtaining in stepb, obtains the antiphase sound wave of initial antiphase sound wave and superposition sound wave.
On the other hand, the present invention is by the following technical solutions:
The passive denoising device of hair dryer of the passive noise-reduction method of a kind of hair dryer for realizing said method, described device is electric radiation plank frame device, comprise heat-generating units 4, working surface unit 3 and insulating unit 2, wherein insulating unit 2 is between working surface unit 3 and ventilating duct inwall 1, working surface unit 3 and insulating unit 2 match with ventilating duct inwall 1, and heat-generating units 4 and working surface unit 3 press close to make that hair dryer ventilating duct 6 is accessible or obstacle is little of to reduce the noise that air circulation produces.
A kind of hair dryer active noise reducing device of the hair dryer active denoising method for realizing said method, acquiring unit, memory cell and broadcast unit that described device comprises control unit and is connected with control unit respectively, wherein: acquiring unit is used for the rotating speed of Real-time Obtaining hair dryer and hair dryer rotating speed is transferred to control unit; Memory cell at least stores the rotating speed-antiphase sonic data storehouse of the rotating speed of reflection hair dryer and the antiphase sound wave corresponding relation in order to offset hair dryer work noise under this rotating speed; Control unit is inquired about described database according to hair dryer rotating speed and is at least obtained initial antiphase sound wave, and sends to broadcast unit; Broadcast unit is for playing this initial antiphase sound wave to suppress the noise of hair dryer.
Particularly, the antiphase sonic data storehouse of the rotating speed-antiphase sound wave-superposition sound wave of the antiphase sound wave corresponding relation of the superposition sound wave after the rotating speed that described memory cell stores reflection hair dryer superposes with initial antiphase sound wave with hair dryer operating noise under the antiphase sound wave in order to offset hair dryer operating noise under this rotating speed and this rotating speed, control unit inquires about described database according to the hair dryer rotating speed of Real-time Obtaining, obtains the antiphase sound wave of initial antiphase sound wave and superposition sound wave.
Particularly, the integrated setting of control unit, acquiring unit and memory cell on a printed circuit board.
Particularly, described broadcast unit is can send sound wave and at the smoother equipment of the frequency response of noise frequency range.
Again on the one hand, the present invention is by the following technical solutions:
A kind of hair dryer, described hair dryer is provided with the passive denoising device of above-mentioned hair dryer and active noise reducing device.
Particularly, control unit, acquiring unit and memory cell are integrated to be arranged on printed circuit board 7, it is inner that described printed circuit board 7 is arranged on hair dryer handle 9, above the printed circuit board 7 that broadcast unit is arranged on hair dryer handle 9 inside or also can be arranged on hair dryer head 5, especially, the passive denoising device of described hair dryer is arranged in hair dryer ventilating duct 6.
The passive noise-reduction method of hair dryer of the present invention is hair dryer ventilating duct is provided with electric radiation plank frame device make the accessible or obstacle of hair dryer ventilating duct little of to reduce the noise that air circulation produces, can also hot blast be provided when noise can be reduced, and owing to using electric radiation mode to make the hot blast temperature of blowout more comfortable.It is main or be used alone passive noise reduction mode and reduce noise and the blank that reduces noise without active denoising method that active denoising method of the present invention compensate for existing hair dryer, affiliated active denoising method does not need carry out the step such as Real-time Collection and calculating to noise thus can shorten noise reduction required time, Be very effective timely, accurate to the suppression of noise.
The passive denoising device of hair dryer of the present invention and active noise reducing device can realize the suppression of said method to noise.Due to the difference of hair dryer type, size and inner actual configuration thereof, the determination of the concrete installation site of broadcast unit is finally determined in the effect of hair dryer handle and hair dryer head diverse location by contrast broadcast unit.
Hair dryer of the present invention is provided with the passive denoising device of above-mentioned hair dryer and active noise reducing device, can reduce the noise that hair dryer work brings when not affecting hair dryer function in a large number, optimizes complete machine radiated noise quality.
Accompanying drawing explanation
Fig. 1 is the flow chart of the hair dryer active denoising method of the preferred embodiment of the present invention one;
Fig. 2 is the cross section schematic arrangement schematic diagram of the passive denoising device of the present invention at ventilating duct;
Fig. 3 is the flow chart of the hair dryer active denoising method of the preferred embodiment of the present invention two;
Fig. 4 is the hair dryer structural representation of the preferred embodiment of the present invention three;
Fig. 5 is the hair dryer structural representation of the preferred embodiment of the present invention four;
Be labeled as in figure:
1. ventilating duct inwall; 2. insulating unit; 3. working surface unit; 4. heat-generating units; 5. hair dryer head; 6. ventilating duct; 7 printed circuit boards; 8. gauge tap; 9. hair dryer handle; 10. air inlet; 11. power lines; 12. air outlets; 13. broadcast units.
Detailed description of the invention
Technical scheme of the present invention is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.
Preferred embodiment one:
As depicted in figs. 1 and 2, this preferred embodiment provides a kind of hair dryer noise-reduction method, comprises the passive noise-reduction method of hair dryer and active denoising method.
The passive noise-reduction method of hair dryer is for be provided with electric radiation plank frame device at hair dryer ventilating duct, described electric radiation plank frame device comprises heat-generating units 4, working surface unit 3 and insulating unit 2, wherein insulating unit 2 is between working surface unit 3 and ventilating duct inwall 1, working surface unit 3 and insulating unit 2 match with ventilating duct inwall 1, and heat-generating units 4 and working surface unit 3 press close to make that hair dryer ventilating duct 6 is accessible or obstacle is little of to reduce the noise that air circulation produces.
Hair dryer active denoising method be prestore the antiphase sound wave of all frequencies of work noise under the various rotating speed of hair dryer and hair dryer at various speeds operating noise superpose with initial antiphase sound wave after the antiphase sound wave of superposition sound wave, form the antiphase sonic data storehouse of rotating speed-antiphase sound wave-superposition sound wave, obtain the antiphase sound wave of initial antiphase sound wave and superposition sound wave according to rotating speed and play, utilizing antiphase to carry out restraint speckle.
The concrete steps of this active denoising method are as follows:
The antiphase sound wave of the superposition sound wave after work noise under the antiphase sound wave of work noise under various for hair dryer rotating speed and the various rotating speed of hair dryer superposes with its antiphase sound wave is all prestored into denoising device and forms the antiphase sonic data storehouse of rotating speed-antiphase sound wave-superposition sound wave as alternative broadcasting sound wave by step 1..Operating noise under the various rotating speed of hair dryer produce when comprising motor, fan work with accelerate air-flow circulate in body produce etc., described noise is that the mean value of gained is tested in the sampling of multiple stage hair dryer;
Step 2. runs blowing program, and hair dryer tachometer value is also transferred to control unit by the tachometer value of acquiring unit Real-time Obtaining hair dryer;
Step 3. control unit obtains the antiphase sound wave of initial antiphase sound wave and superposition sound wave according to the hair dryer tachometer value Query Database of Real-time Obtaining;
Step 4. memory cell exports the antiphase sound wave of this initial antiphase sound wave and superposition sound wave.Initial antiphase sound wave is the antiphase curve of work noise under the various rotating speed of hair dryer prestored in a database, and this curve is equal with the frequency of noise, amplitude is equal and phase place is contrary.The antiphase sound wave of superposition sound wave be the hair dryer that prestores in a database at various speeds operating noise superpose with initial antiphase sound wave after the antiphase curve of superposition sound wave, meet that frequency is equal, amplitude is equal equally and phase place is contrary;
Step 5. plays the antiphase sound wave of this initial antiphase sound wave and superposition sound wave by broadcast unit, then judges whether blowing program completes, if do not complete repetition step 2 to step 5.
It should be noted that, the feature of " frequency is equal, amplitude is equal and phase place is contrary " is not here " proper equal ", those skilled in the art can understand, due to the restriction of technique, technology, this " equal, contrary " should can under acquisition of technology effect " as far as possible equal, contrary ", and it is completely equal or contrary to be interpreted as in absolute sense.
In this preferred embodiment, the passive noise-reduction method of hair dryer is for be provided with electric radiation plank frame device at hair dryer ventilating duct, described electric radiation plank frame device comprises heat-generating units, working surface unit and insulating unit, wherein insulating unit is between working surface unit and ventilating duct inwall, working surface unit and insulating unit and ventilating duct inwall match, heat-generating units and working surface unit press close to make that hair dryer ventilating duct is accessible or obstacle is little of to reduce the noise that air circulation produces, hot blast can also be provided when noise can be reduced, do not affect the using function of hair dryer, hair dryer active denoising method be prestore the antiphase sound wave of work noise under the various rotating speed of hair dryer and hair dryer at various speeds operating noise superpose with its antiphase sound wave after the antiphase sound wave of superposition sound wave, when needs restraint speckle, from the sound wave curve prestored, just select frequency, amplitude are identical, phase place is contrary sound wave curve to carry out broadcasting can restraint speckle timely and effectively.Do not need to carry out Real-time Collection to noise, steps such as calculating thus noise reduction required time can be shortened and without the need to performing complicated operation.
The antiphase sound wave playing superposition sound wave is equivalent to carry out " fine setting " initial antiphase sound wave, because in the middle of real process, because initial antiphase sound wave generally can not meet the condition of " frequency is equal, amplitude is equal and phase place is contrary " completely, need to carry out finely tuning thus strengthening noise reduction further.
Preferred embodiment two:
As shown in Figures 2 and 3, this preferred embodiment provides a kind of hair dryer noise-reduction method, comprises the passive noise-reduction method of hair dryer and active denoising method.Passive noise-reduction method is identical with preferred embodiment one.Hair dryer active denoising method comprises the following steps: A, in denoising device, prestore the rotating speed-antiphase sonic data storehouse of the rotating speed of reflection hair dryer and the antiphase sound wave corresponding relation in order to offset hair dryer work noise under this rotating speed; B, denoising device inquire about described database according to the hair dryer rotating speed of Real-time Obtaining, obtain initial antiphase sound wave; C, carry out broadcasting by broadcast unit according to this initial antiphase sound wave and carry out restraint speckle.
In this preferred embodiment, hair dryer active denoising method is the antiphase sound wave of work noise under the various rotating speed of hair dryer of prestoring, when needs restraint speckle, from the sound wave curve prestored, just select frequency, amplitude are identical, phase place is contrary sound wave curve to carry out broadcasting can restraint speckle timely and effectively.This method save measurement, prestore hair dryer at various speeds operating noise superpose with its antiphase sound wave after the antiphase sound wave of superposition sound wave, and the process play by broadcast unit, makes that program is more succinct, reaction is faster.
Preferred embodiment three:
As shown in Figure 2 and Figure 4, this preferred embodiment provides a kind of hair dryer, this hair dryer comprises hair dryer head 5 and hair dryer handle 9, be arranged on the ventilating duct 6 of hair dryer head 5, air outlet 12 and air inlet 10, the gauge tap 8 being arranged on hair dryer handle 9 place and the power line 11 be connected with hair dryer handle 9.
The electric radiation plank frame device of passive denoising device is arranged in ventilating duct 6, the insulating unit 2 of described device is between working surface unit 3 and ventilating duct inwall 1, working surface unit 3 and insulating unit 2 merge with ventilating duct inwall 1 kissing to be fixed, heat-generating units 4 and working surface unit 3 are pressed close to, and wherein heat-generating units 4 is electrically connected with power supply and gauge tap 8.The control unit of active noise reducing device, get unit, memory cell, communication unit and power supply and be all welded on printed circuit board 7, it is inner that printed circuit board is arranged on hair dryer handle 9, broadcast unit is can send sound wave and be arranged on the head 5 of hair dryer at the smoother equipment of the frequency response of noise frequency range, and printed circuit board 7 and broadcast unit are electrically connected with power supply and gauge tap 8.
It should be noted that, the heat-generating units of above-mentioned passive denoising device can be nichrome wire, carbon fiber etc., above-mentioned working surface unit can be specular aluminium etc., above-mentioned insulating unit can be aluminium carbonate manmade inorganic fibre etc., material due to said units does not affect the realization of this passive denoising device to this passive noise-reduction method, therefore this preferred embodiment does not limit this; Broadcast unit is can send sound wave and at the smoother equipment of the frequency response of noise frequency range, difference due to hair dryer type and size and inner actual configuration thereof causes the difference of noise frequency range, can according to actual conditions Selection effect the best during selection equipment, this preferred embodiment does not limit this; Due to the difference of hair dryer type and size and inner actual configuration thereof, the determination of broadcast unit in the concrete installation site of hair dryer head is finally determined in the effect of hair dryer head diverse location by contrast broadcast unit, and this preferred embodiment does not limit this.
In this preferred embodiment, working surface unit 3 and insulating unit 2 merge with ventilating duct inwall 1 kissing and fix, heat-generating units 4 and working surface unit 3 are pressed close to makes close structure like this, the accessible or little noise that better can reduce air circulation of obstacle of ventilating duct 6.The control unit of active noise reducing device, acquiring unit, memory cell, communication unit and power supply are all welded on printed circuit board 7 and make overall structure compacter, easy for installation.
Preferred embodiment four:
As shown in Figure 2 and Figure 4, this preferred embodiment provides a kind of hair dryer, identical with preferred embodiment three in this hair dryer main body, just broadcast unit 13 is arranged on above the printed circuit board 7 of hair dryer handle 9 inside, during installation, the one side of launching sound wave is pointed to the position at noise source place, make installation more convenient.
Finally it should be noted that above embodiment only in order to technical scheme of the present invention to be described, be preferred embodiment of the present invention, be not limited to the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, all should being included within protection scope of the present invention of improvement.
Claims (10)
1. a hair dryer noise-reduction method, it is characterized in that: comprise the passive noise-reduction method of hair dryer and active denoising method, described passive noise-reduction method is hair dryer ventilating duct is provided with electric radiation plank frame device make the accessible or obstacle of hair dryer ventilating duct little of to reduce the noise that air circulation produces; Described active denoising method comprises the following steps: A, in denoising device, at least prestore the rotating speed-antiphase sonic data storehouse of the rotating speed of reflection hair dryer and the antiphase sound wave corresponding relation in order to offset hair dryer work noise under this rotating speed; B, denoising device inquire about described database according to the hair dryer rotating speed of Real-time Obtaining, at least obtain initial antiphase sound wave; C, carry out broadcasting by broadcast unit according to this initial antiphase sound wave and carry out restraint speckle.
2. one kind for realizing the passive denoising device of the passive noise-reduction method of hair dryer described in claim 1, it is characterized in that: described device is electric radiation plank frame device, comprise heat-generating units (4), working surface unit (3) and insulating unit (2), wherein insulating unit (2) is positioned between working surface unit (3) and ventilating duct inwall (1), working surface unit (3) and insulating unit (2) match with ventilating duct inwall (1), heat-generating units (4) and working surface unit (3) press close to make that hair dryer ventilating duct (6) is accessible or obstacle is little of to reduce the noise that air circulation produces.
3. hair dryer active denoising method according to claim 1, it is characterized in that: after execution of step C, the antiphase sound wave of the superposition sound wave after execution following steps C1, broadcast unit superpose with initial antiphase sound wave according to hair dryer operating noise under this rotating speed carries out broadcasting and suppresses noise further.
4. the hair dryer active denoising method according to claim 1 or 3, it is characterized in that: in step, described database is the antiphase sonic data storehouse of the rotating speed-antiphase sound wave-superposition sound wave of the antiphase sound wave corresponding relation of superposition sound wave after the rotating speed including reflection hair dryer superposes with initial antiphase sound wave with hair dryer operating noise under the antiphase sound wave in order to offset hair dryer operating noise under this rotating speed and this rotating speed; In stepb, denoising device inquires about described database according to the hair dryer rotating speed of Real-time Obtaining, obtains the antiphase sound wave of initial antiphase sound wave and superposition sound wave.
5. one kind for realizing the hair dryer active noise reducing device of the arbitrary described method of claim 1,3,4, it is characterized in that: acquiring unit, memory cell and broadcast unit that described device comprises control unit and is connected with control unit respectively, wherein: acquiring unit, for the rotating speed of Real-time Obtaining hair dryer and hair dryer rotating speed is transferred to control unit; Memory cell, at least stores the rotating speed-antiphase sonic data storehouse of reflection hair dryer rotating speed and the antiphase sound wave corresponding relation in order to offset hair dryer work noise under this rotating speed; Control unit, inquires about described database according to hair dryer rotating speed and at least obtains initial antiphase sound wave, and send to broadcast unit; Broadcast unit, for playing this initial antiphase sound wave to suppress the noise of hair dryer.
6. hair dryer active noise reducing device according to claim 5, it is characterized in that: described memory cell store reflection hair dryer rotating speed superpose with initial antiphase sound wave with hair dryer operating noise under the antiphase sound wave in order to offset hair dryer operating noise under this rotating speed and this rotating speed after the antiphase sonic data storehouse of rotating speed-antiphase sound wave-superposition sound wave of antiphase sound wave corresponding relation of superposition sound wave, control unit inquires about described database according to the hair dryer rotating speed of Real-time Obtaining, obtains the antiphase sound wave of initial antiphase sound wave and superposition sound wave.
7. hair dryer active noise reducing device according to claim 5, is characterized in that: the integrated setting of control unit, acquiring unit and memory cell on a printed circuit board.
8. hair dryer active noise reducing device according to claim 5, is characterized in that: described broadcast unit is can send sound wave and at the smoother equipment of the frequency response of noise frequency range.
9. a hair dryer, is characterized in that: described hair dryer is provided with the passive denoising device of hair dryer as claimed in claim 2 and be provided with as arbitrary in claims 5 to 8 as described in hair dryer active noise reducing device.
10. hair dryer according to claim 9, it is characterized in that: control unit, acquiring unit and memory cell are integrated to be arranged on printed circuit board (7), it is inner that described printed circuit board (7) is arranged on hair dryer handle (9), broadcast unit is arranged on inner printed circuit board (7) top of hair dryer handle (9) or also can be arranged on hair dryer head (5), especially, the passive denoising device of described hair dryer is arranged in hair dryer ventilating duct (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410847622.8A CN105455384A (en) | 2014-12-29 | 2014-12-29 | Method and device for reducing noise of electric hair drier and electric hair drier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410847622.8A CN105455384A (en) | 2014-12-29 | 2014-12-29 | Method and device for reducing noise of electric hair drier and electric hair drier |
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| CN105455384A true CN105455384A (en) | 2016-04-06 |
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| CN201410847622.8A Pending CN105455384A (en) | 2014-12-29 | 2014-12-29 | Method and device for reducing noise of electric hair drier and electric hair drier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110604386A (en) * | 2018-06-15 | 2019-12-24 | 山东富帅无辐射技术股份有限公司 | Radiationless hairdryer of device of making an uproar falls in area |
| CN111462723A (en) * | 2020-03-31 | 2020-07-28 | 上海联影医疗科技有限公司 | Active noise reduction method and device |
| CN111609514A (en) * | 2020-05-19 | 2020-09-01 | 珠海格力电器股份有限公司 | Fan noise control method and device and air conditioning equipment |
-
2014
- 2014-12-29 CN CN201410847622.8A patent/CN105455384A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110604386A (en) * | 2018-06-15 | 2019-12-24 | 山东富帅无辐射技术股份有限公司 | Radiationless hairdryer of device of making an uproar falls in area |
| CN111462723A (en) * | 2020-03-31 | 2020-07-28 | 上海联影医疗科技有限公司 | Active noise reduction method and device |
| CN111462723B (en) * | 2020-03-31 | 2023-09-26 | 上海联影医疗科技股份有限公司 | Active noise reduction method and device |
| CN111609514A (en) * | 2020-05-19 | 2020-09-01 | 珠海格力电器股份有限公司 | Fan noise control method and device and air conditioning equipment |
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Application publication date: 20160406 |