CN109192191A - A kind of active noise reducing device and dish-washing machine - Google Patents
A kind of active noise reducing device and dish-washing machine Download PDFInfo
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- CN109192191A CN109192191A CN201811195388.XA CN201811195388A CN109192191A CN 109192191 A CN109192191 A CN 109192191A CN 201811195388 A CN201811195388 A CN 201811195388A CN 109192191 A CN109192191 A CN 109192191A
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- noise reduction
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- 238000004851 dishwashing Methods 0.000 title claims abstract description 26
- 230000009467 reduction Effects 0.000 claims abstract description 80
- 230000008054 signal transmission Effects 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000006872 improvement Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 208000033748 Device issues Diseases 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4209—Insulation arrangements, e.g. for sound damping or heat insulation
Abstract
The present invention provides a kind of active noise reducing devices.Active noise reducing device includes Noise Acquisition module, noise signal processing module and sound source generators；Noise Acquisition module is used for acquisition noise signal, and by noise signal transmission to noise signal processing module；Noise signal processing module is used for when receiving noise signal, generates noise reduction instruction, and noise reduction instruction is transmitted to sound source generators；Sound source generators are used to instruct in response to noise reduction and issue noise reduction sound wave, wherein the phase of noise reduction sound wave and the opposite in phase of noise signal.Since the noise reduction instruction generated of noise signal processing module can drive sound source generators to issue the opposite in phase noise reduction sound wave with noise signal, therefore noise source can be effectively eliminated from the root, and the excessive space layout of dish-washing machine will not be occupied, effectively reduce cost, the safety coefficient of product is improved, and then improves the user experience effect of dish-washing machine.
Description
Technical field
The present invention relates to active noise reduction fields, in particular to a kind of active noise reducing device and dish-washing machine.
Background technique
Dish-washing machine can generate stronger noise in the operating condition, be in current kitchen environment main noise pollution source it
One, the user experience effect of dish-washing machine is greatly reduced, since the dishwasher into operation time is longer, for a long time by the body to user
Body causes centainly to injure.The core technology of dishwasher product is realized based on principles such as water flow, mechanical reciprocations, therefore
Noise source can not be inherently eliminated.
It is mainly at present based on passive noise reduction to the Research of Noise Reduction direction of dish-washing machine inside industry, practice weekly notes are logical
Structure optimization is crossed, the mode of the materials such as sound insulation, sound-absorbing, damping is increased, although such passive noise reduction schemes can also reduce noise,
Its noise reduction effect is not obvious, and the available capacity that can be occupied a large amount of space layout, reduce product, and product figure is caused to add
Greatly, so as to cause the rising of product overall cost.Simultaneously as most of sound insulation, sound-absorbing material all have certain combustibility,
Therefore passive noise reduction schemes also will be greatly reduced the safety coefficient of product simultaneously.
Summary of the invention
The purpose of the present invention is to provide a kind of active noise reducing devices, to realize the purpose of noise reduction.
The present invention is implemented as follows:
In a first aspect, the present invention proposes a kind of active noise reducing device, the active noise reducing device include Noise Acquisition module,
Noise signal processing module and sound source generators, the noise signal processing module and the Noise Acquisition module and the sound
Source generator is electrically connected；
The Noise Acquisition module is used for acquisition noise signal, and the noise signal transmission to noise signal is handled mould
Block；
The noise signal processing module is used for when receiving the noise signal, generates noise reduction instruction, and will be described
Noise reduction instruction is transmitted to the sound source generators；
The sound source generators issue noise reduction sound wave for responding the noise reduction instruction, wherein the noise reduction sound wave
The opposite in phase of phase and the noise signal.
Further, the noise signal processing module includes processing chip, and the processing chip is for obtaining described make an uproar
The noise spectrum of acoustical signal, and noise control acoustic field signal is generated according to the noise spectrum, and by the noise control sound field
Signal is scaled the noise reduction instruction.
Further, the noise signal processing module further includes signal amplification circuit, the processing chip and the letter
The electrical connection of number amplifying circuit, the signal amplification circuit are used to amplify noise reduction instruction.
Further, the Noise Acquisition module includes multiple Noise Acquisition devices, and each Noise Acquisition device is and institute
State the electrical connection of noise signal processing module.
Further, the Noise Acquisition device includes first shell and acoustic sensor, the acoustic sensor setting
In the inner surface of the first shell, the side of the first shell is formed opening and is adopted using the noise as the Noise Acquisition device
Collect port.
Further, the Noise Acquisition device further includes waterproof membrane, and the waterproof membrane is covered in the Noise Acquisition port.
Further, micropore is offered on the waterproof membrane, the micropore is in threadiness and is interconnected.Further,
The first shell is made of waterproof material.
On the other hand, the present invention proposes that a kind of dish-washing machine, the dish-washing machine include second shell and above-mentioned active noise reduction
Device, the active noise reducing device include Noise Acquisition module, noise signal processing module and sound source generators, the noise
Signal processing module is electrically connected with the Noise Acquisition module and the sound source generators；
The Noise Acquisition module is used for acquisition noise signal, and the noise signal transmission to noise signal is handled mould
Block；
The noise signal processing module is used for when receiving the noise signal, generates noise reduction instruction, and will be described
Noise reduction instruction is transmitted to the sound source generators；
The sound source generators issue noise reduction sound wave for responding the noise reduction instruction, wherein the noise reduction sound wave
The opposite in phase of phase and the noise signal.
The sound source generators and the Noise Acquisition module are all set in the inner surface of the second shell.
Further, the dish-washing machine inner surface is made of waterproof material.
Compared with the prior art, the invention has the following advantages: a kind of active noise reducing device provided by the invention, active
Denoising device includes Noise Acquisition module, noise signal processing module and sound source generators, noise signal processing module with make an uproar
Sound acquisition module and sound source generators are electrically connected；Noise Acquisition module is used for acquisition noise signal, and by noise signal transmission
To noise signal processing module；Noise signal processing module is used for when receiving noise signal, generates noise reduction instruction, and will drop
Instruction of making an uproar is transmitted to sound source generators；Sound source generators are used to instruct in response to noise reduction and issue noise reduction sound wave, wherein noise reduction sound wave
Phase and noise signal opposite in phase.Since the noise reduction instruction generated of noise signal processing module can drive sound source
Device issues the opposite in phase noise reduction sound wave with noise signal, therefore can effectively eliminate noise source from the root, and will not
The excessive space layout of dish-washing machine is occupied, cost is effectively reduced, improves the safety coefficient of product, and then improve and wash the dishes
The user experience effect of machine.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Fig. 1 shows a kind of Noise Acquisition device structural schematic diagram provided by the present invention.
Fig. 2 shows a kind of structural schematic diagrams of Noise Acquisition device provided by the present invention.
Fig. 3 shows a kind of collected noise audiogram of Noise Acquisition device institute provided by the present invention.
Fig. 4 shows the noise reduction sound wave waveform diagram that a kind of sound source generators provided by the present invention are issued.
Fig. 5 shows noise signal sound wave provided by the present invention and noise reduction sound wave complex superposition waveform diagram.
Fig. 6 shows a kind of dishwasher structure schematic diagram provided by the present invention.
Primary symbols explanation: 100- active noise reducing device；110- noise signal acquisition module；120- noise processed module；
200- Noise Acquisition device；210- Noise Acquisition port；220- acoustic sensor；230- first shell；300- dish-washing machine；310-
Second shell；320- sound source generators.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that the instruction such as term " on ", "lower", "left", "right", "inner", "outside"
Orientation or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when usually put
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, and comes for those skilled in the art
It says, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any modification, equivalent
Replacement, improvement etc., should all be included in the protection scope of the present invention.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile of the invention
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
First embodiment
Fig. 1 is please referred to, is a kind of block diagram of active noise reducing device 100 provided by the present invention.Active noise reduction dress
Setting 100 includes Noise Acquisition module 110, noise signal processing module 120 and sound source generators 320, and noise signal handles mould
Block 120 is electrically connected with Noise Acquisition module 110 and sound source generators 320.
Noise Acquisition module 110 is used for acquisition noise signal, and by noise signal transmission to noise signal processing module
120。
In a kind of preferred embodiment, the Noise Acquisition module 110 includes multiple Noise Acquisition devices 200, Mei Gesuo
Noise Acquisition device 200 is stated to be electrically connected with the noise signal processing module 120.
It referring to figure 2., is a kind of structural schematic diagram of Noise Acquisition device 200 provided by the present invention.The Noise Acquisition device
200 include first shell 230 and acoustic sensor 220.
First shell 230 is made of waterproof material, is made an uproar to avoid the water flow intrusion in 300 course of work of dish-washing machine
Inside sound collector 200, while the side of first shell 230 is formed opening and is adopted using the noise as the Noise Acquisition device 200
Collect port 210.In a kind of preferred embodiment, a kind of 210 surface of the Noise Acquisition port film ventilative using water-proof sound-transmitting
It is covered., can be to avoid during acquisition noise by the way that the ventilative film of the water-proof sound-transmitting is arranged, spray arm ejects
Water flow to being had an impact inside Noise Acquisition device 200.
The acoustic sensor 220 is set to the inner surface of the first shell 230, which is used for will
Collected noise signal is converted to electric signal and is transmitted to noise signal processing module 120.
It should be noted that the quantity of the acoustic sensor 220 is at least two.
Noise signal processing module 120 is used for when receiving noise signal, generates noise reduction instruction, and noise reduction is instructed and is passed
Transport to sound source generators 320.
Noise signal processing module 120 includes processing chip and signal amplification circuit.The processing chip and the letter
The electrical connection of number amplifying circuit.
Processing chip is used to obtain the noise spectrum of the noise signal, and generates noise control according to the noise spectrum
Acoustic field signal, and the noise control acoustic field signal is scaled the noise reduction and is instructed.
Processing chip is used to noise signal being converted to noise spectrum, to generate noise control sound according to the noise spectrum
Field signal, and then the noise control acoustic field signal is scaled the noise reduction and is instructed.
It should be noted that noise reduction instruction is that noise reduction drives audio signal, noise reduction driving audio signal is for driving sound
Source generator 320 issues noise reduction sound wave.
Amplifying circuit is electrically connected with processing chip, and amplifying circuit is used to carry out signal to the noise reduction instruction that processing chip generates
Amplification.
Sound source generators 320 are used to instruct in response to noise reduction and issue noise reduction sound wave, to realize active noise reduction.
It please gather referring to Fig. 3, Fig. 4 and Fig. 5, Fig. 3 is collected for a kind of Noise Acquisition device 200 provided by the present invention
Noise audiogram；Fig. 4 is by a kind of noise reduction sound wave waveform diagram that sound source generators 320 issue provided by the present invention；Fig. 5 is
Noise signal sound wave provided by the present invention and noise reduction sound wave complex superposition waveform diagram.
Wherein, the opposite in phase of the phase and noise signal of noise reduction sound wave, the voice signal of opposite in phase theoretically can
It significantly balances out, therefore the enough effective counteracting noise sound waves of noise reducing wave energy that sound source generators are issued, reaches drop
The effect made an uproar.
In conclusion the working principle of the active noise reducing device 100 are as follows: the Noise Acquisition device 200 of Noise Acquisition module 110
For acquisition noise signal, and by noise signal transmission to noise signal processing module 120.Receiving for signal processing module is made an uproar
The processing chip of acoustical signal, noise signal processing module 120 carries out operation to noise signal, and exports the noise of the noise signal
Frequency spectrum to generate noise control acoustic field signal according to the noise spectrum, and then the noise control acoustic field signal is scaled
The noise reduction instruction.The amplifying circuit of last noise signal processing module 120, which instructs noise reduction, carries out signal amplification.It is amplified
Noise reduction instruction is transferred to sound source generators 320, and sound source generators 320 instruct according to noise reduction and issue the phase with noise signal
Opposite noise reduction sound wave.
Second embodiment
The embodiment of the invention also provides a kind of dish-washing machine 300, it is high etc. excellent to have noiseless, at low cost and safety coefficient
Point.
Fig. 6 is please referred to, is a kind of 300 structural schematic diagram of dish-washing machine provided by the present invention.The dish-washing machine 300 includes second
Active noise reducing device 100 described in shell 310 and first embodiment.The active noise reducing device 100 includes Noise Acquisition module
110, noise signal processing module 120 and sound source generators 320, noise signal processing module 120 and Noise Acquisition module 110
And sound source generators 320 are electrically connected.
Noise Acquisition module 110 is used for acquisition noise signal, and by noise signal transmission to noise signal processing module
120.In a kind of preferred embodiment, the Noise Acquisition module 110 includes multiple Noise Acquisition devices 200, each described to make an uproar
Sound collector 200 is electrically connected with the noise signal processing module 120, and Noise Acquisition device 200 is located at dish-washing machine 300
Inner surface.
It referring to figure 2., is a kind of structural schematic diagram of Noise Acquisition device 200 provided by the present invention.The Noise Acquisition device
200 include first shell 230 and acoustic sensor 220.
First shell 230 is made of waterproof material, is made an uproar to avoid the water flow intrusion in 300 course of work of dish-washing machine
Inside sound collector 200, while the side of first shell 230 is formed opening and is adopted using the noise as the Noise Acquisition device 200
Collect port 210, which is handled using water-proof sound-transmitting ventilating structure, to avoid during acquisition noise, is sprayed
The water flow that ejects of leaching arm inside Noise Acquisition device 200 to having an impact.
In a kind of preferred embodiment, 210 surface of Noise Acquisition port using a kind of water-proof sound-transmitting breathe freely film into
Row covering.
Noise signal processing module 120 is used for when receiving noise signal, generates noise reduction instruction, and noise reduction is instructed and is passed
Transport to sound source generators 320.
Noise signal processing module 120 includes processing chip and signal amplification circuit.The processing chip and the letter
The electrical connection of number amplifying circuit.
Processing chip is used to obtain the noise spectrum of the noise signal, and generates noise control according to the noise spectrum
Acoustic field signal, and the noise control acoustic field signal is scaled the noise reduction and is instructed.
Processing chip is used to noise signal being converted to noise spectrum, to generate noise control sound according to the noise spectrum
Field signal, and then the noise control acoustic field signal is scaled the noise reduction and is instructed.Amplifying circuit is electrically connected with processing chip,
Amplifying circuit is used to carry out signal amplification to the noise reduction instruction that processing chip generates.
Sound source generators 320 are used to instruct in response to noise reduction and issue noise reduction sound wave, to realize active noise reduction.
It please gather referring to Fig. 3, Fig. 4 and Fig. 5, Fig. 3 is collected for a kind of Noise Acquisition device 200 provided by the present invention
Noise audiogram；Fig. 4 is by a kind of noise reduction sound wave waveform diagram that sound source generators 320 issue provided by the present invention；Fig. 5 is
Noise signal sound wave provided by the present invention and noise reduction sound wave complex superposition waveform diagram.
Wherein, the opposite in phase of the phase and noise signal of noise reduction sound wave, the voice signal of opposite in phase theoretically can
Significantly balance out.
In a kind of preferred embodiment, which is located at the inner surface of dish-washing machine 300, and quantity is at least
It is two.
To sum up, a kind of active noise reducing device provided by the invention, active noise reducing device include Noise Acquisition module, noise letter
Number processing module and sound source generators, noise signal processing module are electrically connected with Noise Acquisition module and sound source generators；
Noise Acquisition module is used for acquisition noise signal, and by noise signal transmission to noise signal processing module；Noise signal processing
Module is used for when receiving noise signal, generates noise reduction instruction, and noise reduction instruction is transmitted to sound source generators；Sound source occurs
Device is used to instruct in response to noise reduction and issue noise reduction sound wave, wherein the phase of noise reduction sound wave and the opposite in phase of noise signal.Due to
The noise reduction instruction generated of noise signal processing module can drive sound source generators to issue the opposite in phase noise reduction with noise signal
Sound wave, therefore noise source can be effectively eliminated from the root, and will not occupy the excessive space layout of dish-washing machine, effectively
It reduces costs, improves the safety coefficient of product, and then improve the user experience effect of dish-washing machine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of active noise reducing device, which is characterized in that the active noise reducing device includes Noise Acquisition module, at noise signal
It manages module and sound source generators, the noise signal processing module and the Noise Acquisition module and the sound source generators is equal
Electrical connection；
The Noise Acquisition module is used for acquisition noise signal, and by the noise signal transmission to noise signal processing module；
The noise signal processing module is used for when receiving the noise signal, generates noise reduction instruction, and by the noise reduction
Instruction is transmitted to the sound source generators；
The sound source generators issue noise reduction sound wave for responding the noise reduction instruction, wherein the phase of the noise reduction sound wave
With the opposite in phase of the noise signal.
2. active noise reducing device according to claim 1, which is characterized in that the noise signal processing module includes processing
Chip, the processing chip is used to obtain the noise spectrum of the noise signal, and generates noise control according to the noise spectrum
Acoustic field signal processed, and the noise control acoustic field signal is scaled the noise reduction and is instructed.
3. active noise reducing device according to claim 2, which is characterized in that the noise signal processing module further includes letter
Number amplifying circuit, the processing chip are electrically connected with the signal amplification circuit, and the signal amplification circuit is used for the drop
Instruction of making an uproar amplifies.
4. active noise reducing device according to claim 1, which is characterized in that the Noise Acquisition module includes multiple noises
Collector, each Noise Acquisition device are electrically connected with the noise signal processing module.
5. active noise reducing device according to claim 4, which is characterized in that the Noise Acquisition device include first shell with
And acoustic sensor, the acoustic sensor are set to the inner surface of the first shell, the side of the first shell is formed
It is open using the Noise Acquisition port as the Noise Acquisition device.
6. active noise reducing device according to claim 5, which is characterized in that the Noise Acquisition device further includes waterproof membrane,
The waterproof membrane is covered in the Noise Acquisition port.
7. active noise reducing device according to claim 6, which is characterized in that micropore is offered on the waterproof membrane, it is described
Micropore is in threadiness and is interconnected.
8. active noise reducing device according to claim 5, which is characterized in that the first shell uses waterproof material system
At.
9. a kind of dish-washing machine, which is characterized in that the dish-washing machine includes second shell and any one of such as claim 1-8
The active noise reducing device, the sound source generators and the Noise Acquisition module are all set in the interior table of the second shell
Face.
10. dish-washing machine according to claim 9, which is characterized in that the dish-washing machine inner surface is made of waterproof material.
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| CN201811195388.XA CN109192191A (en) | 2018-10-15 | 2018-10-15 | A kind of active noise reducing device and dish-washing machine |
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| CN201811195388.XA CN109192191A (en) | 2018-10-15 | 2018-10-15 | A kind of active noise reducing device and dish-washing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021004166A1 (en) * | 2019-07-05 | 2021-01-14 | 青岛海信日立空调系统有限公司 | Ducted air conditioner |
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- 2018-10-15 CN CN201811195388.XA patent/CN109192191A/en active Pending
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| KR20120084911A (en) * | 2011-01-21 | 2012-07-31 | 주식회사 백조씽크 | Fruits and vegetable cleaner noise masking method |
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| WO2021004166A1 (en) * | 2019-07-05 | 2021-01-14 | 青岛海信日立空调系统有限公司 | Ducted air conditioner |
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