CN111685645B - Active noise reduction system for dust collector and dust collector with active noise reduction system - Google Patents
Active noise reduction system for dust collector and dust collector with active noise reduction system Download PDFInfo
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- CN111685645B CN111685645B CN201910185199.2A CN201910185199A CN111685645B CN 111685645 B CN111685645 B CN 111685645B CN 201910185199 A CN201910185199 A CN 201910185199A CN 111685645 B CN111685645 B CN 111685645B
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- 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
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
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- 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
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/24—Hand-supported suction cleaners
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- 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
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/1683—Dust collecting chambers; Dust collecting receptacles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses an active noise reduction system for a dust collector and the dust collector thereof, wherein the upstream and the downstream are defined according to the fluid flowing direction of the normal work of the dust collector, the dust collector comprises a negative pressure fan, a front stage air duct positioned at the upstream of the negative pressure fan and a rear stage air cavity positioned at the downstream of the negative pressure fan, wherein the active noise reduction system is at least partially arranged in the rear stage air cavity of the dust collector, the active noise reduction system at least comprises a pickup assembly used for collecting noise and a loudspeaker assembly used for emitting noise reduction sound waves, the loudspeaker assembly comprises a loudspeaker cavity, and the loudspeaker cavity is communicated with the rear stage air cavity or positioned in the rear stage air cavity so as to improve the noise reduction effect of the dust collector.
Description
Technical Field
The invention relates to the field of household cleaning, in particular to a dust collector.
Background
The household dust collector becomes an indispensable cleaning tool for modern families, but as the power of the dust collector is increased, the noise generated by the household dust collector also becomes headache for users, and adverse reactions such as headache, nerve decline and the like can be generated for the users in serious conditions. Noise reduction technology for vacuum cleaners has also become a focus of increasing attention for technicians. In the prior art, noise reduction treatment is performed mainly from the aspects of optimizing a motor, improving an air duct or adding/improving a sound absorption material, but the measures can generate obvious inhibiting effect on medium-high frequency noise and have poor treatment effect on low-frequency noise. Some solutions for processing low-frequency noise by using active noise reduction technology are disclosed in the existing patents (refer to the chinese utility model patent, publication No. CN206102556U), however, the solutions are too ideal, so that the patent technologies are difficult to be introduced into the practical application of the vacuum cleaner; meanwhile, the inner space of the dust collector is compact, so that the active noise reduction equipment is effectively arranged, and the problem that how to eliminate the influence of turbulent airflow on sound sample collection and the like is still needed to be solved.
Therefore, there is a need for an active noise reduction scheme compatible with a vacuum cleaner and a vacuum cleaner using the same.
Disclosure of Invention
The invention aims to solve the problems and provides an active noise reduction scheme which can be matched with a dust collector and the dust collector using the scheme.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an active noise reduction system for dust catcher, with the normal working fluid circulation direction of dust catcher defines the low reaches, the dust catcher includes negative pressure fan, is located the preceding stage wind channel in negative pressure fan's the upper reaches and is located the back level wind chamber in negative pressure fan low reaches, wherein, active noise reduction system part at least is located in the back level wind chamber of dust catcher, active noise reduction system is at least including the pickup subassembly that is used for collecting the noise and being used for launching the subassembly of raising one's voice of making an uproar that falls, the subassembly of raising one's voice includes the sound raising chamber, the sound raising chamber with back level wind chamber intercommunication or the sound raising chamber is located in the back level wind chamber.
Further, the pickup assembly at least comprises a first pickup device, the first pickup device comprises a first pickup cavity, the first pickup cavity is communicated with the rear stage wind cavity, and an included angle between the opening direction of the first pickup cavity and the fluid circulation direction is not greater than 90 degrees.
Further, the pickup assembly at least comprises a first pickup device, the rear stage air cavity comprises a bent air path, and the first pickup device and the loudspeaker assembly are located in different bent sections of the bent air path.
Further, the pickup assembly includes at least a first pickup device located upstream of the speaker assembly and a second pickup device located downstream of the speaker assembly.
Further, the second sound pickup device is arranged on the shell of the dust collector and comprises a second sound pickup cavity, the second sound pickup cavity is independent from the rear-stage wind cavity, and the second sound pickup cavity is opened outwards along the shell of the dust collector.
Further, the active noise reduction system comprises a signal processing module and a signal generating module, wherein the signal processing module at least comprises a signal filtering unit and a phase modulation unit, the signal filtering unit is configured to filter out a low-frequency signal according to a signal of the first sound pickup device, and the phase modulation unit is configured to generate a reverse-phase low-frequency signal based on the low-frequency signal; the signal generation module is configured to generate a noise reduction signal to the speaker component based on the inverse low-frequency signal.
Further, the active noise reduction system comprises a negative feedback module, wherein the negative feedback module filters out a second low-frequency signal based on the signal of the second sound pickup device and generates a negative feedback signal based on the second low-frequency signal after inverting, and the negative feedback module is configured to output the negative feedback signal to the signal generation module after the signal generation module outputs the noise reduction signal; the signal generation module is configured to adjust the noise reduction signal based on the negative feedback signal.
Further, the dust catcher includes the fuselage subassembly, can dismantle connect in the dirt cup subassembly of fuselage subassembly, the fuselage subassembly is including supporting or accommodating negative-pressure air fan's bracket component, the pickup subassembly includes third pickup attachment, third pickup attachment includes third pickup cavity, the third pickup cavity is relative back-stage wind cavity is independent, and towards negative-pressure air fan or the bracket component.
Further, in the fluid flowing direction, the distance between the third sound pickup device and the fan assembly is smaller than the distance between the loudspeaker assembly and the fan assembly.
Further, the active noise reduction system comprises a signal processing module and a signal generating module, wherein the signal processing module at least comprises a signal filtering unit and a phase modulation unit; the signal filtering unit is configured to filter out a high-frequency signal according to a signal of a third sound pickup device, and the phase modulation unit is configured to generate an anti-phase high-frequency signal based on the high-frequency signal; the signal generating module is configured to generate a noise reduction signal to the speaker component based on the inverted high-frequency signal.
Further, the dust collector comprises a machine body assembly and a dust cup assembly detachably connected to the machine body assembly, the machine body assembly comprises a support assembly for supporting or accommodating the negative pressure fan, the pickup assembly comprises a third pickup device, the third pickup device comprises a third pickup cavity, and the third pickup cavity is independent relative to the rear stage air cavity and faces the negative pressure fan or the support assembly; the active noise reduction system comprises a signal processing module and a signal generating module, wherein the signal processing module at least comprises a signal filtering unit and a phase modulation unit; the signal filtering unit is configured to filter out low-frequency signals according to signal comparison of the first sound pickup device and the third sound pickup device, and the phase modulation unit is configured to generate reverse-phase low-frequency signals based on the low-frequency signals; the signal generation module is configured to generate a noise reduction signal to the speaker component based on the inverse low-frequency signal.
Further, the active noise reduction system comprises a negative feedback module, wherein the negative feedback module filters out a second low-frequency signal based on the signal contrast of the second sound pickup device and the third sound pickup device and generates a negative feedback signal based on the phase reversal of the second low-frequency signal, and the negative feedback module is configured to output the negative feedback signal to the signal generation module after the signal generation module outputs the noise reduction signal; the signal generation module is configured to adjust the noise reduction signal based on the negative feedback signal.
The invention also provides a dust collector comprising any one of the active noise reduction systems.
In summary, the sound pickup assembly and the speaker assembly are disposed at different positions of the body assembly of the dust collector, and each assembly of the active noise reduction system is arranged according to the actual situation inside the dust collector, so that the noise reduction system is more targeted, and the structure of each assembly is adjusted to reduce the interference of turbulence on devices and the crosstalk between the noise reduction assembly and the collection assembly, so that the data collected by signals are more accurate. In addition, the third sound pickup device is used for independently detecting high-frequency noise, and the noise data and the feedback data collected by the components are respectively filtered based on the high-frequency data of the third sound pickup device, so that the obtained low-frequency data is more accurate compared with the method for directly filtering the collected noise data and the feedback data, and the noise reduction effect achieved through the data is better.
Drawings
FIG. 1 is a schematic view of the overall structure of one embodiment of the vacuum cleaner of the present invention;
FIG. 2 is a schematic view of a portion of the vacuum cleaner shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along A-A of the vacuum cleaner shown in FIG. 2;
FIG. 4 is a schematic cross-sectional view of the vacuum cleaner shown in FIG. 2 taken along the line B-B;
FIG. 5 is a schematic diagram of one implementation logic of the active noise reduction system for a vacuum cleaner of the present invention;
FIG. 6 is a schematic diagram of another logic implementation of the active noise reduction system for a vacuum cleaner of the present invention;
FIG. 7 is a schematic diagram of another logic implementation of the active noise reduction system for a vacuum cleaner of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the embodiments described herein are illustrative only and are not limiting upon the present invention.
Referring to fig. 1, the present invention provides a vacuum cleaner with an active noise reduction system, in one embodiment of the present invention, the vacuum cleaner includes a body assembly 10, a dust cup assembly 20 detachably connected to the body assembly 10, the body assembly 10 includes a handpiece assembly 11, an air intake assembly 12 and a handle assembly 13, the handpiece assembly 11 includes at least one negative pressure assembly configured to provide negative pressure to the vacuum cleaner.
The first embodiment is as follows:
referring to fig. 2, the handpiece assembly 11 further includes an air inlet 111 located upstream of the negative pressure device and an air outlet 119 located downstream of the negative pressure device, with the upstream and downstream directions being defined by the fluid flow direction of the cleaner during normal operation. The air inlet 111 may be in communication with the dirt cup assembly 20, and when the vacuum cleaner is actually used, the airflow mixed with dust may enter the dirt cup assembly 20 through the air inlet pipe 12, and after the dirt and air are separated by the dirt cup assembly 20, the clean airflow enters the negative pressure device through the air inlet 111, and finally is discharged through the air outlet 119.
Specifically, referring to fig. 3 to 4, the negative pressure device includes a negative pressure fan 15, and a damping gasket (not shown) is disposed between the negative pressure fan 15 and the body of the vacuum cleaner to reduce the vibration noise generated when the negative pressure fan 15 works. The fuselage assembly 10 includes a support assembly (not numbered) that supports or houses the negative pressure fan 15, and the aforementioned cushion rings are disposed between the support assembly and the fuselage, it being noted that in alternative embodiments, the cushion rings may also be disposed between the support assembly and the fuselage; in other embodiments, a shock-absorbing structure similar to a shock-absorbing washer can be arranged among the negative pressure fan, the bracket component and the machine body at the same time.
Specifically, in this embodiment, the vacuum cleaner further includes a front air duct (not shown) located upstream of the negative pressure fan 15, a rear air chamber (not numbered) located downstream of the negative pressure fan 15, and an active noise reduction system located in the main body assembly 10, where the active noise reduction system at least includes a sound pickup assembly for collecting noise and a speaker assembly 50 for emitting noise reduction sound waves, and the sound pickup assembly at least includes a first sound pickup device 51 located upstream of the speaker assembly and a second sound pickup device 52 located downstream of the speaker assembly. This first sound pickup apparatus 51 includes first sound pickup chamber (not numbered) and locates sound pickup (not numbered) in the sound pickup apparatus, this first sound pickup chamber with back level wind cavity intercommunication, simultaneously the open-ended opening direction in first sound pickup chamber with the contained angle of fluid circulation direction is not more than 90 degrees for when noise in the air current that flows out negative pressure positive blower can be monitored to first sound pickup apparatus 51, avoid being strikeed by the air current directly, make noise monitoring data more accurate. The speaker assembly 50 includes a speaker chamber located in and communicating with the rear stage air chamber.
For the dust collector, because to the demand of vacuum, the leakproofness requirement of dust collector to the gas circuit is very high, general dust collector is at work, the noise that produces in preceding level wind channel is very little, and because the reason of air current direction, the noise of preceding level wind channel to air propagation is very little for the proportion of the noise of whole machine, so to active noise reduction system's actual operating position, it is far away not directly to the complete machine collection noise to gather the accuracy that the data that the noise was made an uproar was gathered to the back level wind cavity, the same sets up speaker subassembly in the back level wind cavity, can directly fall the noise to the noise source, noise reduction effect is better.
In a preferred embodiment, the rear stage air chamber includes a bent air duct, such as a U-shaped air duct as shown, but the bent air duct may be a zigzag air duct, a Z-shaped air duct, etc. commonly used in the art. The first sound pickup device 51 and the speaker assembly 50 are respectively disposed at different bending sections of the bent air duct (not in the same straight air duct), so as to reduce crosstalk of the speaker assembly 50 to the first sound pickup device 51. In a more preferred embodiment, the opening direction of the first sound-collecting cavity of the first sound-collecting device 51 faces back to the opening direction of the sound-emitting cavity of the speaker assembly 50.
Specifically, the second sound pickup device 52 is disposed on the housing of the dust collector, and the second sound pickup device 52 includes a second sound pickup cavity, which is independent from the rear-stage wind cavity, and the second sound pickup cavity is opened outwards along the housing of the dust collector, so that the second sound pickup device can collect the noise actually generated by the dust collector in the air, and adjust the overall noise reduction system based on the data collected by the second sound pickup device, so as to achieve the best noise reduction effect.
In this embodiment, the active noise reduction system at least includes a signal processing module and a signal generating module, where the signal processing module at least includes a signal filtering unit and a phase modulation unit, the signal filtering unit is configured to filter out a low-frequency signal according to a signal of a first sound pickup apparatus, and the phase modulation unit is configured to generate an inverse low-frequency signal based on the low-frequency signal; the signal generation module is configured to generate a noise reduction signal based on the inverse low-frequency signal by conventional means such as signal amplification, and output the noise reduction signal to the speaker component for active noise reduction.
Meanwhile, the active noise reduction system further comprises a negative feedback module, wherein the negative feedback module filters out a second low-frequency signal based on the signal of the second sound pickup device and generates a negative feedback signal based on the phase reversal of the second low-frequency signal, and the negative feedback module is configured to output the negative feedback signal to the signal generation module after the signal generation module outputs the noise reduction signal. Generally, the negative feedback signal is a superimposed signal, i.e. the superimposed signal becomes a new noise reduction signal without interruption of the noise reduction signal. Through the negative feedback module, the noise reduction signal is adjusted in real time so as to achieve the optimal noise reduction effect.
In the modified embodiment, after the active noise reduction is performed by the speaker module, negative feedback adjustment may be performed based on the signal of the first sound collecting device, but since the first sound collecting device is located upstream of the flowing air, the sensitivity of the feedback adjustment is greatly deteriorated due to the accuracy of the data due to the doppler effect, and the negative feedback adjustment may be performed by the method of the present invention without considering that the noise reduction effect is optimized.
In a preferred embodiment, the distance between the second sound pickup device and the speaker assembly 50 is smaller than the distance between the first sound pickup device and the speaker assembly 50 in the direction of fluid communication. To improve the sensitivity of the negative feedback adjustment.
It should be noted that the signal filtering frequency band of the first sound pickup apparatus and the filtering frequency band of the second sound pickup apparatus are identical. So that the active noise reduction system is more targeted.
Example two:
in another embodiment of the present invention, the sound pickup assembly of the active noise reduction system further includes a third sound pickup device 53, and the third sound pickup device 53 includes a third sound pickup cavity which is independent from the rear stage air cavity and faces the negative pressure fan or the bracket assembly, so as to specifically collect noise data of the negative pressure fan. Because the most main source of the high-frequency noise of the whole machine body is the cutting of the fan to the air and the friction noise of the whole rotor of the fan, the data of the high-frequency noise of the part are directly collected, the whole active noise reduction system can analyze low-frequency noise signals more conveniently, and the noise reduction effect of the whole system on the low-frequency noise can be optimal.
Specifically, in this embodiment, the active noise reduction system includes a signal processing module and a signal generating module, where the signal processing module at least includes a signal filtering unit and a phase modulation unit, the signal filtering unit is configured to filter out a low-frequency signal according to signal contrast of a first sound pickup apparatus and a third sound pickup apparatus, and the phase modulation unit is configured to generate an inverse low-frequency signal based on the low-frequency signal; the signal generating module is configured to generate a continuous noise reduction signal to the speaker component based on the inverse low-frequency signal.
Similarly, the active noise reduction system further comprises a negative feedback module, wherein the negative feedback module filters out a second low-frequency signal based on the signal contrast of the second sound pickup device and the third sound pickup device and generates a negative feedback signal based on the phase reversal of the second low-frequency signal, and the negative feedback module is configured to output the negative feedback signal to the signal generation module after the signal generation module outputs the noise reduction signal. Generally, the negative feedback signal is a superimposed signal, i.e. the superimposed signal becomes a new noise reduction signal without interruption of the noise reduction signal. Through the negative feedback module, the noise reduction signal is adjusted in real time so as to achieve the optimal noise reduction effect.
It should be noted that the signal filtering frequency band of the first sound pickup apparatus and the filtering frequency band of the second sound pickup apparatus are identical.
Example three:
unlike the second embodiment in which the picked-up information of the third sound pickup means is used as an auxiliary for filtering, in another embodiment of the present invention, the third sound pickup means 53 may be further used for active noise reduction (active noise reduction) with respect to high-frequency noise. Since the wavelength of the high-frequency noise is very short, the larger the ratio of the difference between the propagation distance of the actually acquired sound wave and the distance between the acquisition point and the noise reduction point to the wavelength in the reaction time (the time difference between the acquired signal and the output signal) of the whole active noise reduction system is, the less controllable the noise reduction effect of the whole high-frequency band is, and thus the distance between the position of the third sound pickup device and the position of the speaker assembly has a great influence on the noise reduction effect of the high-frequency active noise reduction system. To overcome this, in the present embodiment of the invention, the distance from the high-frequency sound pickup assembly (third sound pickup means 53) to the fan assembly in the fluid communication direction is smaller than the distance between the speaker assembly and the fan assembly. Optionally, in the fluid flowing direction, there is a first distance between the third sound pickup device and the fan assembly, and there is a second distance between the speaker assembly and the fan assembly, and a difference between the first distance and the second distance is equal to a product of the active noise reduction system reaction time and a propagation speed of sound in air (340 m/s). Preferably, the difference between the first distance and the second distance is greater than 3 cm.
In the high-frequency active noise reduction system of the present embodiment, the signal filtering unit is configured to filter out a high-frequency signal according to a signal of the third sound pickup apparatus, and the phase modulation unit is configured to generate an inverted high-frequency signal based on the high-frequency signal; the signal generating module is configured to generate a continuous noise reduction signal to the speaker component based on the inverted high-frequency signal.
In the high-frequency feedback system of this embodiment, after the signal of making an uproar falls in the production, the negative feedback module filters out the second high frequency signal based on the signal of third pickup attachment to based on the negative feedback signal is produced after the second high frequency signal looks in reverse, at this moment, the negative feedback module to the signal takes place the module output the negative feedback signal takes place the signal of making an uproar to the signal of making an uproar falls in real time adjustment signal generation module output.
In addition to the descriptions in the three embodiments mentioned above, a general active noise reduction system further includes a similar comparison module, a power amplification module, and the like, but since the structures of the parts are common knowledge in the art, the specific structure of the active noise reduction system is not described again in the present invention. Meanwhile, the performance of the speaker or the performance of the sound pickup and the like do not affect the implementation of the concept of the present invention, and therefore, the detailed description thereof is omitted.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims.
Claims (11)
1. An active noise reduction system for a dust collector, wherein the upstream and the downstream are defined according to the fluid flowing direction of the normal work of the dust collector, the dust collector comprises a negative pressure fan, a front stage air duct positioned at the upstream of the negative pressure fan and a rear stage air cavity positioned at the downstream of the negative pressure fan, and the active noise reduction system is at least partially arranged in the rear stage air cavity of the dust collector and at least comprises a pickup assembly used for collecting noise and a loudspeaker assembly used for emitting noise reduction sound waves, the loudspeaker assembly comprises a sound raising cavity, and the sound raising cavity is communicated with the rear stage air cavity or is positioned in the rear stage air cavity;
the pickup assembly at least comprises a first pickup device, the first pickup device comprises a first pickup cavity, and the first pickup cavity is communicated with the rear stage wind cavity;
the dust collector comprises a machine body assembly and a dust cup assembly detachably connected to the machine body assembly, the machine body assembly comprises a support assembly for supporting or accommodating the negative-pressure fan, the pickup assembly comprises a third pickup device, the third pickup device comprises a third pickup cavity, and the third pickup cavity is independent relative to the rear-stage air cavity and faces the negative-pressure fan or the support assembly;
in the fluid circulation direction, the distance between the third sound pickup device and the fan assembly is smaller than the distance between the loudspeaker assembly and the fan assembly.
2. The active noise reduction system for a vacuum cleaner of claim 1, wherein the first pickup cavity opening direction is at an angle of no more than 90 degrees to the fluid flow direction.
3. The active noise reduction system for a vacuum cleaner of claim 1, wherein the pickup assembly comprises at least a first pickup device, the rear stage air cavity comprises a bent air path, and the first pickup device and the speaker assembly are located in different bent segments of the bent air path.
4. The active noise reduction system for a vacuum cleaner of claim 1, wherein the pickup assembly includes at least a first pickup upstream of the speaker assembly and a second pickup downstream of the speaker assembly.
5. The active noise reduction system for a vacuum cleaner of claim 4, wherein the second sound pickup device is arranged on a housing of the vacuum cleaner, the second sound pickup device comprises a second sound pickup cavity, the second sound pickup cavity is independent from the rear stage wind cavity, and the second sound pickup cavity is opened outwards along a housing of the vacuum cleaner.
6. The active noise reduction system for a vacuum cleaner of claim 4, wherein the active noise reduction system comprises a signal processing module and a signal generating module, the signal processing module comprises at least a signal filtering unit and a phase modulation unit,
the signal filtering unit is configured to filter out a low-frequency signal according to a signal of the first sound pickup device, and the phase modulation unit is configured to generate an anti-phase low-frequency signal based on the low-frequency signal;
the signal generating module is configured to generate a noise reduction signal to the speaker component based on the inverse low-frequency signal.
7. The active noise reduction system for a vacuum cleaner of claim 6, wherein the active noise reduction system comprises a negative feedback module, the negative feedback module filters out a second low frequency signal based on the signal of the second sound pickup device and generates a negative feedback signal based on the second low frequency signal after being inverted, the negative feedback module is configured to output the negative feedback signal to the signal generation module after the signal generation module outputs the noise reduction signal;
the signal generation module is configured to adjust the noise reduction signal based on the negative feedback signal.
8. The active noise reduction system for vacuum cleaner of claim 1, wherein the active noise reduction system comprises a signal processing module and a signal generating module, the signal processing module comprises at least a signal filtering unit and a phase modulation unit,
the signal filtering unit is configured to filter out a high-frequency signal according to a signal of a third sound pickup apparatus, and the phase modulation unit is configured to generate an anti-phase high-frequency signal based on the high-frequency signal;
the signal generating module is configured to generate a noise reduction signal to the speaker component based on the inverse high-frequency signal.
9. The active noise reduction system for a vacuum cleaner of claim 4, wherein the vacuum cleaner comprises a body assembly, a dirt cup assembly detachably connected to the body assembly, the body assembly comprises a bracket assembly for supporting or accommodating the negative pressure fan, the pickup assembly comprises a third pickup device, the third pickup device comprises a third pickup cavity, and the third pickup cavity is independent from the rear stage air cavity and faces the negative pressure fan or the bracket assembly;
the active noise reduction system comprises a signal processing module and a signal generating module, wherein the signal processing module at least comprises a signal filtering unit and a phase modulation unit,
the signal filtering unit is configured to filter out low-frequency signals according to signal comparison of the first sound pickup device and the third sound pickup device, and the phase modulation unit is configured to generate reverse-phase low-frequency signals based on the low-frequency signals;
the signal generation module is configured to generate a noise reduction signal to the speaker component based on the inverse low-frequency signal.
10. The active noise reduction system of claim 9, comprising a negative feedback module, wherein the negative feedback module filters out a second low frequency signal based on the signal contrast of the second sound pickup device and the third sound pickup device, and generates a negative feedback signal based on the phase inversion of the second low frequency signal, and the negative feedback module is configured to output the negative feedback signal to the signal generation module after the noise reduction signal is output by the signal generation module;
the signal generation module is configured to adjust the noise reduction signal based on the negative feedback signal.
11. A vacuum cleaner, characterized in that the vacuum cleaner comprises an active noise reduction system for a vacuum cleaner as claimed in any one of claims 1-10.
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| TWI790597B (en) | 2020-05-21 | 2023-01-21 | 佳音醫療器材股份有限公司 | Device for alleviating obstructive sleep apnea |
| JP2024049925A (en) * | 2022-09-29 | 2024-04-10 | パナソニックＩｐマネジメント株式会社 | Method for controlling suction motor of cleaner, and cleaner |
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| JPH053841A (en) * | 1991-06-28 | 1993-01-14 | Sharp Corp | Cleaner |
| JPH057536A (en) * | 1991-07-05 | 1993-01-19 | Sharp Corp | Standing type vacuum cleaner |
| US5502869A (en) * | 1993-02-09 | 1996-04-02 | Noise Cancellation Technologies, Inc. | High volume, high performance, ultra quiet vacuum cleaner |
| CN101211558A (en) * | 2006-12-28 | 2008-07-02 | 海尔集团公司 | Active noise reduction method and device |
| JP2009118996A (en) * | 2007-11-14 | 2009-06-04 | Panasonic Corp | Vacuum cleaner |
| CN104053093B (en) * | 2014-06-25 | 2017-11-07 | 南京信息工程大学 | A kind of Portable type room denoiser |
| TWI597987B (en) * | 2016-02-19 | 2017-09-01 | 中強光電股份有限公司 | Method and system for reducing fan noise and electric device using same |
| CN206102556U (en) * | 2016-06-06 | 2017-04-19 | 北京小米移动软件有限公司 | A active noise reduction device and self -cleaning equipment for self -cleaning equipment |
| KR20180097393A (en) * | 2017-02-23 | 2018-08-31 | 엘지전자 주식회사 | Cleaner with sound output function |
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