CN111946640B - Hair dryer and noise reduction method thereof - Google Patents
Hair dryer and noise reduction method thereof Download PDFInfo
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- CN111946640B CN111946640B CN202010808002.9A CN202010808002A CN111946640B CN 111946640 B CN111946640 B CN 111946640B CN 202010808002 A CN202010808002 A CN 202010808002A CN 111946640 B CN111946640 B CN 111946640B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
- A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Abstract
The invention provides a blower and a noise reduction method thereof, and the noise reduction method disclosed by the invention comprises the following steps: a second noise signal is obtained by acquiring a first noise signal of a blower and performing a first noise reduction processing operation on the first noise signal. The invention adopts an active noise reduction mode to carry out noise reduction processing operation on the noise signal of the blower in a targeted manner, thereby effectively improving the noise reduction effect and greatly reducing the working noise of the blower.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a hair drier and a noise reduction method thereof.
Background
The noise of the hair dryer is always the core problem which restricts the product quality, most manufacturers reduce the noise by additionally installing a silencer structure or adopting a higher-end fan motor mode at present, but the hair dryer has larger volume and weight or extremely high cost, and the noise reduction effect is very limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the hair drier and the noise reduction method thereof. The invention specifically adopts the following technical scheme.
In order to achieve the purpose, the invention discloses a noise reduction method of a hair drier, which comprises the following steps: acquiring a first noise signal of a blower; and executing a first noise reduction processing operation on the first noise signal to obtain a second noise signal after noise reduction of the blower.
Optionally, the noise reduction method of the hair dryer further includes: detecting whether the second noise signal meets a preset noise reduction requirement or not; and when the second noise signal is determined not to meet the noise reduction requirement, executing a second noise reduction processing operation on the second noise signal according to the noise reduction requirement.
Optionally, in the above method for reducing noise of a blower, performing a first noise reduction processing operation on the first noise signal includes: performing full-band active noise reduction processing on the first noise signal at least once; performing a second noise reduction processing operation on the second noise signal comprises: and carrying out narrow-band active noise reduction processing on the second noise signal at least once.
Optionally, before performing at least one narrow-band active noise reduction process on the second noise signal, the method further includes: judging whether a narrow-band signal exists in the second noise signal; determining information for each narrowband signal when it is determined that at least one narrowband signal is present in the second noise signal; and judging whether to execute the second noise reduction processing operation on the second noise signal according to the information of each narrow-band signal.
Optionally, in the above method for reducing noise of a hair dryer, the information of each narrow-band signal includes: determining the central frequency, the amplitude and the initial phase of each narrow-frequency signal; judging whether to execute the second noise reduction processing operation on the second noise signal according to the information of each narrow-band signal comprises the following steps: judging whether the amplitude of each narrow-frequency signal is smaller than a threshold corresponding to the central frequency of the narrow-frequency signal; and determining to perform the second noise reduction processing operation on the second noise signal when the amplitude of at least one narrowband signal is greater than a threshold corresponding to the center frequency of the narrowband signal; the at least one narrow-band active noise reduction processing on the second noise signal comprises: and performing narrow-band active noise reduction processing on the second noise signal at least once so that the amplitude of the at least one narrow-band signal is smaller than a threshold corresponding to the central frequency of the narrow-band signal.
Optionally, the above method for reducing noise of a hair dryer, wherein the determining the center frequency, the amplitude and the initial phase of each narrow-band signal includes: determining the center frequency of each narrow-band signal according to the frequency domain information of the second noise signal; and determining the amplitude and the initial phase of each narrow-frequency signal based on an adaptive algorithm.
Optionally, in the above method for reducing noise of a blower, performing a first noise reduction processing operation on the first noise signal includes: performing narrow-band active noise reduction processing on the first noise signal at least once; performing a second noise reduction processing operation on the second noise signal comprises: and carrying out full-band active noise reduction processing on the second noise signal at least once.
The application of the present invention also discloses a hair dryer, which comprises: a processor; and a memory having computer program instructions stored therein, wherein the computer program instructions, when executed by the processor, cause the processor to perform a method of noise reduction for a hair dryer as in any one of the above.
Optionally, in the blower, the blower further includes: the acquisition device is used for acquiring the first noise signal and the second noise signal and transmitting the first noise signal and the second noise signal to the processor; and the output device is used for outputting the noise reduction sound waves generated by the processor executing the first noise reduction processing operation and the second noise reduction processing operation.
Optionally, in the hair dryer, when the collecting device and the output device are both disposed in the air inlet section of the hair dryer, the collecting device is disposed at an upwind position close to the driver of the hair dryer, the output device is disposed at a position close to the air inlet, and a sound generating direction of the output device faces the air inlet; or when the collecting device and the output device are arranged in the air outlet section of the blower together, the collecting device is arranged at the downwind position close to the blower driver, and the sound production direction of the output device faces the air outlet.
Optionally, the blower further comprises at least one of the following components: the diversion spacer is arranged at the position where the airflow direction between the air inlet section and the air outlet section changes and has a bending radian which is transited from the airflow direction of the air inlet section to the airflow direction of the air outlet section; a flow directing structure disposed on the output device; and the passive noise reduction material is adhered or installed inside the air inlet section and/or the air outlet section.
Has the advantages that:
the invention obtains a second noise signal by acquiring a first noise signal of the blower and executing a first noise reduction processing operation on the first noise signal in an active noise reduction mode. According to the characteristics of the collected first noise signal, the noise signal of the blower is subjected to noise reduction processing in a targeted manner, the noise reduction effect is effectively improved, and the working noise of the blower is greatly reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
figure 1 is a schematic view of a first hair dryer according to the invention;
figure 2 is a schematic view of a second blower of the invention;
in the figure, 1 denotes an air intake; 2 denotes an air outlet; 3 denotes a driver; 11 denotes an air intake section; 22 denotes an air outlet section; 4 denotes a collecting device; 5 denotes an output device; r1 denotes a first noise reduction processing unit; r2 denotes a second noise reduction processing unit; 6 denotes a control system; 7 represents a functional element; and 8 denotes a guide diaphragm.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.
The meaning of "inside and outside" in the invention means that the direction from the shell to the inside of the air duct is inside, and vice versa, relative to the hair dryer itself; and not as a specific limitation on the mechanism of the device of the present invention.
The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.
The 'upwind position and downwind position' in the invention mean that along the direction of the air duct, the position close to the air inlet is the upwind position, and the position close to the air outlet is the downwind position; and not as a specific limitation on the mechanism of the device of the present invention.
Fig. 1 shows a hair dryer according to the invention, comprising a housing, a wind tunnel formed by the housing, and a drive 3 mounted inside the wind tunnel. Both ends of the air duct are respectively provided with an air inlet 1 and an air outlet 2. The air duct is bounded by an airflow driving device formed by the driver 3, and can structurally divide the blower into an air inlet section 11 and an air outlet section 22. The overall structure of the present invention may be designed to be T-shaped or L-shaped or other shapes, which is not limited in the present invention. The air inlet section 11 is provided with an air inlet 1, the air outlet section 22 is provided with an air outlet 2, and the motor and the fan form the driver 3 which can be arranged between the air inlet section 11 and the air outlet section 22. In the air outlet section 22, a functional element 7 may be further disposed at a position close to the air outlet 2, where the functional element 7 includes, but is not limited to, a heating assembly and an anion generator. The rear side of the air outlet section 22 can be correspondingly provided with a bent pipe and a rear shell.
The shell of the blower is also provided with an active noise reduction system which is used for offsetting noise generated when the blower operates. The active noise reduction system comprises an acquisition device 4, an output device 5, a first noise reduction processing unit R1 and a second noise reduction processing unit R2. The blower described above further includes a processor and a memory, which may be disposed in the first noise reduction processing unit R1 and the second noise reduction processing unit R2. Stored in the memory are computer program instructions which, when executed by the processor, cause the processor to perform the noise reduction method disclosed herein. The collecting device 4 collects noise signals of the blower and transmits the collected noise signals to the processor. The output means 5 is for outputting a noise reduction sound wave generated in accordance with a result of the processor performing the noise reduction processing operation.
Considering the overall noise of the hair dryer, not only the noise of the air outlet 2, but also a part of the noise generated by the air inlet 1, the installation position of the active noise reduction system is not limited in the invention, and the active noise reduction system can be placed in the air inlet section 11 or the air outlet section 22. Therefore, the invention can correspondingly offset the sound field at the air inlet 1 or the air outlet 2 of the blower, thereby effectively reducing the cost of actively reducing noise of the machine body. Specifically, the method comprises the following steps:
(1) wherein the active noise reduction system is arranged at the air outlet section 22. As shown in fig. 2 as an example, when the collecting device 4 and the output device 5 are disposed together in the air outlet section 22 of the hair dryer, the collecting device 4 is disposed at a downwind position close to the driver 3 of the hair dryer, and the sound emitting direction of the output device 5 faces the air outlet 2. The output device 5 may be disposed at any position before or after the blower function 7, and is not limited to a specific position. The processor and/or memory may be integrally disposed within the first and second noise reduction processing units R1 and R2, for example, as shown in fig. 2, the processor and/or memory may be disposed between the acquisition device 4 and the output device 5, and the control system 6 may be disposed within a rear housing cavity formed by the rear housing.
(2) When the active noise reduction system is arranged in the air intake section 11. Referring to fig. 1 as an example, when the collecting device 4 and the output device 5 are disposed together in the air intake section 11 of the hair dryer, the collecting device 4 is disposed near the upwind position of the driver 3 of the hair dryer, and the output device 5 can be disposed near the air intake 1 with the sound-emitting direction of the output device 5 facing the air intake 1. Specifically, the output device 5 may be axially disposed at the lower end of the handle shown in fig. 1, and the air inlet 1 at the lower end of the handle is an inverted trapezoidal circular truncated cone, and the sound of the inverted trapezoidal circular truncated cone is directed toward the air inlet 1, so as to cancel the airflow noise of the air inlet 1. The processor and/or memory may be integrally disposed within the first and second noise reduction processing units R1 and R2, for example, as shown in fig. 1, the processor and/or memory may be disposed between the acquisition device 4 and the output device 5, and the control system 6 may be disposed within a rear housing cavity formed by the rear housing.
The control unit for the functional elements 7 of the blower heating assembly, the anion generator, etc., is preferably integrated in the control system 6.
Besides eliminating noise by an active noise reduction mode, the blower can further selectively stick or mount a passive noise reduction material inside, and preferably stick or mount a sound absorption or sound insulation material inside the air inlet section 11 and/or the air outlet section 22. Therefore, the working noise of the blower is further reduced by the passive noise reduction design, and the whole noise of the blower is offset after the active noise reduction, so that the residual noise can be absorbed only by a passive noise reduction material with a smaller volume. Therefore, the invention can also solve the problems that the small household appliance is limited in size and is difficult to install the passive noise reduction material for noise reduction, and can ensure that the output air volume of the blower is not influenced by the noise reduction structure basically.
The invention can also further arrange a diversion spacer 8 at the position where the airflow direction between the air inlet section 11 and the air outlet section 22 of the blower is changed, the diversion spacer 8 is arranged to have a curvature that the airflow direction of the air inlet section 11 is transited to the airflow direction of the air outlet section 22, and the disturbance and the structural vibration in the airflow turning process are reduced by utilizing the bent pipe part, so that the integral output noise of the blower is further reduced.
The invention can further arrange a flow guiding structure on the output device 5: if the loudspeaker is used as the output device 5, the back of the loudspeaker is designed into a flow guide structure, so that the airflow resistance of the loudspeaker is reduced, and the structural vibration caused by airflow impact is avoided.
Preferably, the blower device may optionally be provided with a data display device.
The specific installation mode of each device is not limited, and each device can be fixed on the side wall in the blower in a post-installation mode such as a bracket; and an integrally formed die can be designed in the earlier stage, the specific installation structure of the device is planned in advance, and the installation mode and the position of the device are determined.
The invention can comprehensively use the active noise reduction circuit and the noise reduction structure in the hair dryer, such as the diversion spacer 8, the diversion structure, the passive noise reduction material and the like, and can effectively improve the noise reduction effect of the hair dryer.
Specifically, the active noise reduction system can perform effective sound field cancellation on narrow-frequency spike noise in a targeted manner aiming at the characteristics of more high-frequency noise, higher overall noise energy and narrow-frequency spike noise in the blower, so as to effectively reduce the working noise of the blower. The specific active noise reduction method comprises the following steps:
the processor in which the active noise reduction system is provided may have, for example, 2 or more noise reduction processing units. Referring to fig. 1, 2 noise reduction processing units disposed on the inner wall of the blower will be described as an example.
The 2 noise reduction processing units in the present embodiment may be provided as the first noise reduction processing unit R1, and the second noise reduction processing unit R2.
Firstly, performing a first noise reduction processing operation on a first noise signal acquired by an acquisition device 4, namely an original noise signal of a blower by using R1 to obtain a second noise signal; when it is determined that the R2 needs to be driven when the second noise reduction processing operation is performed on the second noise signal, the second noise reduction processing operation is performed according to a preset noise reduction requirement.
The first embodiment: the first noise reduction processing operation of R1 may be set to: and carrying out full-band active noise reduction processing on the first noise signal at least once to obtain a second noise signal. For example, the frequency domain curve of the second noise signal after noise reduction may be compared with the expected frequency domain curve to determine whether to perform the second noise reduction processing operation on the second noise signal. When a peak (narrow-band noise signal) which is significantly higher than the expected frequency-domain curve exists in the sound field frequency-domain curve, a second denoising operation is performed on the residual narrow-band noise signal identified by the system by R2, and the second denoising operation is: and carrying out narrow-band active noise reduction processing on the second noise signal at least once.
The step of identifying and judging the second noise signal in the noise reduction method comprises the following steps:
(1) and judging whether a narrow-band signal exists in the second noise signal.
(2) When it is determined that at least one narrowband signal is present in the second noise signal, determining information for each narrowband signal: the center frequency, amplitude and initial phase of each narrowband signal need to be determined. Determining a center frequency of each narrow-band signal according to the frequency domain information of the second noise signal; and determining the amplitude and the initial phase of each narrow-frequency signal based on an adaptive algorithm.
(3) Judging whether to execute the second noise reduction processing operation on the second noise signal according to the information of each narrow-band signal: and judging whether the amplitude of each narrow-band signal is smaller than a threshold corresponding to the central frequency of the narrow-band signal, and determining to execute the second noise reduction processing operation on the second noise signal when the amplitude of at least one narrow-band signal is larger than the threshold corresponding to the central frequency of the narrow-band signal.
Specifically, the method comprises the following steps: the time domain representation of the narrowband noise signal is:
which can determine the amplitude A and the initial phase by an adaptive algorithm
The narrow frequency is subjected to targeted noise reduction, and the corresponding noise reduction signals are as follows:
the second noise reduction processing operation includes performing at least one narrow-band active noise reduction processing on the second noise signal such that the amplitude of the at least one narrow-band signal is less than a threshold corresponding to a center frequency of the narrow-band signal.
In particular, R2 can be implemented by a trap to handle narrow-band noise, where each trap frequency is equal to each narrow-band frequency.
In some embodiments of the present invention, R2 may also be implemented as a band pass filter based on a finite impulse response structure. When R2 is a band pass filter, the center frequency of each pass band is equal to each narrowband frequency, and then R2 can further suppress the residual narrowband noise and the noise in the left and right bandwidths.
In a second embodiment, the first denoising processing operation performed in R1 may be specifically set as: performing narrow-band active noise reduction processing on the first noise signal at least once to obtain a second noise signal; accordingly, the second denoising processing operation performed in R2 may specifically be: and carrying out full-band active noise reduction processing on the second noise signal at least once.
That is, the noise reduction method of the present invention does not limit the order in which both the wideband active noise reduction and the narrowband active noise reduction are performed. It should be noted that, in addition to the above two embodiments, the wideband active noise reduction and the narrowband active noise reduction can be performed synchronously based on two threads.
The main implementation of the above noise reduction method may be an active noise reduction system (including the acquisition device 4, the output device 5, the first noise reduction processing unit R1 and the second noise reduction processing unit R2); it is also possible that only the processors in the first noise reduction processing unit R1 and the second noise reduction processing unit R2 are used, and the noise reduction processing operation at this time includes a process of acquiring the noise signal acquired by the acquisition means 4 from the acquisition means and calculating the noise reduction signal, and does not include a process of outputting the noise reduction sound wave by the output means 5.
The noise reduction method provided by the invention can be suitable for the active noise reduction of the single-air-duct electric hair drier and also suitable for the active noise reduction of the multi-air-duct electric hair drier. The invention can ensure the air volume of the blower, reduce the noise of the blower without increasing the volume of the blower, and has higher noise reduction efficiency compared with other blowers.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (9)
1. A method of reducing noise in a hair dryer, comprising:
acquiring a first noise signal of a blower;
executing a first noise reduction processing operation on the first noise signal to obtain a second noise signal after noise reduction of the blower;
detecting whether the second noise signal meets a preset noise reduction requirement or not;
when the second noise signal is determined not to meet the noise reduction requirement, judging whether a narrow-band signal exists in the second noise signal;
determining information for each narrowband signal when it is determined that at least one narrowband signal is present in the second noise signal;
judging whether to execute a second noise reduction processing operation on the second noise signal according to the information of each narrow-band signal; and
when it is determined that the second noise reduction processing operation is performed on the second noise signal, the second noise reduction processing operation is performed.
2. A method of reducing noise in a hair dryer as claimed in claim 1, wherein performing a first noise reduction processing operation on said first noise signal comprises: performing full-band active noise reduction processing on the first noise signal at least once;
performing a second noise reduction processing operation on the second noise signal comprises: and carrying out narrow-band active noise reduction processing on the second noise signal at least once.
3. A method of reducing noise in a hair dryer as in claim 2, wherein determining information for each narrowband signal comprises: determining the central frequency, the amplitude and the initial phase of each narrow-frequency signal;
judging whether to execute a second noise reduction processing operation on the second noise signal according to the information of each narrow-band signal comprises the following steps:
judging whether the amplitude of each narrow-frequency signal is smaller than a threshold corresponding to the central frequency of the narrow-frequency signal; and
determining to perform the second noise reduction processing operation on the second noise signal when the amplitude of at least one narrowband signal is greater than a threshold corresponding to a center frequency of the narrowband signal;
the at least one narrow-band active noise reduction processing on the second noise signal comprises: and performing narrow-band active noise reduction processing on the second noise signal at least once so that the amplitude of the at least one narrow-band signal is smaller than a threshold corresponding to the central frequency of the narrow-band signal.
4. A method of reducing noise in a hair dryer as in claim 3, wherein determining the center frequency, amplitude and initial phase of each narrowband signal comprises:
determining the center frequency of each narrow-band signal according to the frequency domain information of the second noise signal; and
and determining the amplitude and the initial phase of each narrow-frequency signal based on an adaptive algorithm.
5. A method of reducing noise in a hair dryer as claimed in claim 1, wherein performing a first noise reduction processing operation on said first noise signal comprises: performing narrow-band active noise reduction processing on the first noise signal at least once;
performing a second noise reduction processing operation on the second noise signal comprises: and carrying out full-band active noise reduction processing on the second noise signal at least once.
6. A hair dryer, comprising:
a processor; and
memory in which computer program instructions are stored, which, when executed by the processor, cause the processor to perform the method according to any one of claims 1-5.
7. The hair dryer of claim 6, further comprising:
the acquisition device is used for acquiring the first noise signal and the second noise signal and transmitting the first noise signal and the second noise signal to the processor; and
and the output device is used for outputting the noise reduction sound waves generated by the processor executing the first noise reduction processing operation and the second noise reduction processing operation.
8. The hair dryer of claim 7, wherein said collection assembly is disposed proximate to an upwind position of a blower driver when said collection assembly and said output assembly are disposed together in an air intake section of said hair dryer, said output assembly is disposed proximate to an air intake and a sound emission direction of said output assembly is directed toward said air intake;
or when the collecting device and the output device are arranged in the air outlet section of the blower together, the collecting device is arranged at the downwind position close to the blower driver, and the sound production direction of the output device faces the air outlet.
9. The hair dryer of claim 8, further comprising at least one of:
the diversion spacer is arranged at the position where the airflow direction between the air inlet section and the air outlet section changes and has a bending radian which is transited from the airflow direction of the air inlet section to the airflow direction of the air outlet section;
a flow directing structure disposed on the output device; and
and the passive noise reduction material is adhered or installed inside the air inlet section and/or the air outlet section.
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| CN107702171A (en) * | 2017-10-16 | 2018-02-16 | 北京安声科技有限公司 | A kind of active denoising method applied in lampblack absorber |
| CN109282479A (en) * | 2018-09-17 | 2019-01-29 | 青岛海信日立空调系统有限公司 | Air conditioner noise reduction device and noise-reduction method |
| CN111145715A (en) * | 2019-12-27 | 2020-05-12 | 汉得利（常州）电子股份有限公司 | Active noise control system and control method for fan |
| CN111210798A (en) * | 2020-01-07 | 2020-05-29 | 珠海格力电器股份有限公司 | Noise reduction assembly, washing machine, and determination method and determination device of noise reduction algorithm |
| CN111402853A (en) * | 2020-03-02 | 2020-07-10 | 吉林大学 | Wide-band and narrow-band hybrid active noise reduction algorithm suitable for interior of vehicle |
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