Active noise reduction fan

Abstract

The embodiment of the invention relates to the technical field of fans, and particularly discloses an active noise reduction fan which comprises a shell which is a portable shell, a cavity is formed in the shell, and an air inlet and an air outlet which are communicated with each other are formed in the two ends of the shell respectively; the fan assembly is arranged in the cavity and used for rotating to generate wind pressure so that air can be sucked in from the air inlet, passes through the cavity and then is blown out from the air outlet; the noise reduction assembly is arranged in the cavity and used for collecting noise signals inside and outside the cavity in real time when the fan assembly operates and sending out noise reduction signals according to the noise signals; wherein the noise reduction signal is a dynamic comprehensive noise signal including air inlet noise, air outlet noise, fan blade noise and / or motor noise. Through reasonable design of functions of the noise reduction assembly, active noise control is performed on the noise signal by using the noise reduction signal, and the noise level during operation of the fan is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of fans, and in particular to an active noise reduction fan. Background Art

[0002] In recent years, people are increasingly pursuing a more convenient life. In order to meet the demand for using fans in outdoor activities or other life scenarios, a variety of portable fan products have appeared on the market, such as handheld fans, neck-hanging fans, etc.

[0003] In the current development of portable fans, noise is generated due to mechanical friction of the fan itself and the operation of airflow. The higher the fan speed and the greater the air volume, the greater the noise, resulting in a poor user experience. Passive methods are currently used to control noise, such as covering the inner wall of the machine with sound insulation cotton and optimizing the heat dissipation channel. However, these methods have limited effects on eliminating noise. Therefore, how to effectively eliminate the noise generated by the fan during operation is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide an active noise reduction fan that can effectively reduce the fan operating noise in response to the above technical problems.

[0005] An embodiment of the present application provides an active noise reduction fan, the active noise reduction fan comprising: The housing is a portable housing having a cavity inside and an air inlet and an air outlet connected to each other are respectively arranged at two ends of the housing; A fan assembly is disposed in the cavity and is used to rotate to generate wind pressure so as to draw air from the air inlet, pass through the cavity, and then blow it out from the air outlet; A noise reduction component is disposed in the cavity, and is used to collect noise signals inside and outside the cavity in real time when the fan component is running, and to send a noise reduction signal according to the noise signal; The noise signal is a dynamic integrated noise signal including air inlet noise, air outlet noise, fan blade noise and / or motor noise.

[0006] In one embodiment, the noise reduction component includes: A signal collector, disposed in the cavity, for collecting the noise signal in real time when the fan assembly is running; A signal processor, disposed in the cavity and electrically connected to the signal collector, for acquiring the noise signal and generating a signal generation instruction according to the noise signal; a signal generator, disposed in the cavity and electrically connected to the signal processor, for acquiring the signal generation instruction and issuing the noise reduction signal according to the signal generation instruction; Wherein, within a preset error tolerance range, the noise reduction signal and the noise signal have opposite phases and the same frequency and amplitude, so as to perform destructive interference on the noise signal and realize active noise control of the fan assembly.

[0007] In one embodiment, the signal collector includes at least one sound sensor, and the at least one sound sensor is arranged at at least one corresponding target point in the cavity, and is used to collect static noise signals near each target point in real time; The target points include at least the edge of the air inlet, the edge of the air outlet, the vicinity of the motor, the vicinity of the fan blades, and the vicinity of the center of the air duct. The air intake noise includes the static air intake noise generated by the active noise reduction fan when it is in fixed use and the dynamic air intake noise generated when the user shakes it; the air outlet noise includes the static air outlet noise generated by the active noise reduction fan when it is in fixed use and the dynamic air outlet noise generated when the user shakes it; the fan blade noise includes the static fan blade noise generated by the active noise reduction fan when it is in fixed use and the dynamic fan blade noise generated when the user shakes it; the motor noise includes the static motor noise generated by the active noise reduction fan when it is in fixed use and the dynamic fan blade noise generated when the user shakes it.

[0008] In one embodiment, the signal processor includes a filter, a signal synthesizer, a signal amplifier, an analog-to-digital converter, and a computer chip electrically connected in sequence; The filter is used to perform real-time filtering on the noise signals collected by each sound sensor to obtain a filtered noise signal; The signal synthesizer is used to perform signal fusion processing on each of the filtered noise signals to obtain a comprehensive noise signal; The signal amplifier is used to perform signal amplification processing on the integrated noise signal to obtain a dynamically composed integrated amplified signal; The analog-to-digital converter is used to perform analog-to-digital conversion on the integrated amplified signal to obtain a corresponding pulse coded signal; The computer chip is used to perform phase inversion processing on the pulse code signal to obtain inverted signal data, and generate the signal generation instruction based on the inverted signal data.

[0009] In one embodiment, the signal generator includes at least one sound player and a power amplifier arranged corresponding to each of the target points; Wherein, the power amplifier is used to amplify the inverted signal data carried by the signal generation instruction to obtain a power amplified signal; The sound player is used to send out a noise reduction signal with a phase opposite to that of the comprehensive noise signal and the same frequency and amplitude according to the power amplified signal.

[0010] In one embodiment, the signal processor further comprises an amplitude comparator, wherein an input end of the amplitude comparator is electrically connected to the analog-to-digital converter, and an output end of the amplitude comparator is electrically connected to the computer chip; The amplitude comparator is used to obtain the pulse coded signal and extract a corresponding noise amplitude sequence from the pulse coded signal, so as to compare the noise amplitude sequence with a preset amplitude threshold to obtain a first comparison result; The computer chip is also used to obtain the first comparison result, and when the first comparison result is that the noise amplitude sequence is greater than the amplitude threshold, perform phase inversion processing on the pulse coded signal to obtain the inverted signal data, or, when the first comparison result is that the noise amplitude sequence is less than or equal to the amplitude threshold, end the noise reduction program.

[0011] In one embodiment, the signal processor further comprises a decibel comparator, the input end of the decibel comparator is electrically connected to the signal collector, and the output end of the decibel comparator is electrically connected to the computer chip; The decibel comparator is used to obtain a residual noise signal from the signal collector after the signal generator sends the noise reduction signal, and extract a corresponding noise decibel value from the residual noise signal, so as to compare the noise decibel value with a preset decibel threshold to obtain a second comparison result; The computer chip is also used to obtain the second comparison result, and when the second comparison result is that the noise decibel value is greater than the decibel threshold, reduce the speed of the motor of the fan assembly, or, when the second comparison result is that the noise decibel value is less than or equal to the decibel threshold, end the noise reduction program.

[0012] In one embodiment, the signal processor further comprises: The error acquisition component is disposed in the cavity and electrically connected to the computer chip, and is used to calculate the error between the noise signal and the noise reduction signal to obtain error signal data, and feed the error signal data back to the computer chip so as to calibrate the noise reduction signal through the computer chip.

[0013] In one embodiment, the active noise reduction fan further includes a memory, which is disposed in the cavity and is used to store a preset speed and noise comparison table and a noise reduction signal database; wherein the speed and noise comparison table is used to characterize the mapping relationship between the speed of the motor in the fan assembly and the corresponding noise signal generated by the fan assembly; the noise reduction signal database is used to store noise reduction signals with opposite phases, the same frequency and amplitude as multiple preset noise signals; The noise reduction component is also used to obtain the real-time speed of the motor when the fan component is running, and determine the target noise signal matching the real-time speed according to the speed and noise comparison table, and determine the target noise reduction signal matching the target noise signal from the noise reduction signal database, so as to perform active noise control on the fan component based on the target noise reduction signal.

[0014] In one embodiment, the active noise reduction fan as described above includes at least a handheld fan for wireless hand-held use, a neck-hanging fan for neck-hanging use, or a strapping fan for strapping use.

[0015] In one of the embodiments, the active noise reduction fan is applied to a high-speed motor whose operating speed exceeds a preset speed; wherein the high-speed motor comprises a high-speed three-phase motor.

[0016] The above-mentioned active noise reduction fan, on the one hand, stores the fan assembly and the noise reduction assembly in the cavity through a portable shell, which greatly reduces the physical volume of the fan, makes the device easy to carry, suitable for use in various occasions, and improves the portability and operability of the active noise reduction fan; on the other hand, by distinguishing itself from the prior art, this solution can dynamically analyze various noise signals, including air intake noise, air outlet noise, fan blade noise and / or motor noise, through reasonable design of the function of the noise reduction assembly, so as to collect the dynamic comprehensive noise signal generated inside and outside the cavity in real time when the fan assembly is running, and send out a corresponding noise reduction signal according to the dynamic comprehensive noise signal, thereby realizing active noise control of the fan assembly to reduce the noise level when the fan is running.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0019] Figure 1 is a front and side perspective schematic diagram of an active noise reduction fan according to an exemplary embodiment; Figure 2 is a three-dimensional schematic diagram of the back side of an active noise reduction fan according to an exemplary embodiment; Figure 3 is a three-dimensional exploded schematic diagram of an active noise reduction fan according to an exemplary embodiment; Figure 4 is a side cross-sectional schematic diagram of an active noise reduction fan according to an exemplary embodiment; Figure 5 is a module schematic diagram of a signal processor according to an exemplary embodiment; Figure 6 is a module schematic diagram of a signal generator according to an exemplary embodiment; Figure 7 is a module schematic diagram of an automated signal processing system according to an exemplary embodiment; Figure 8 is a logic diagram of an automated signal processing program according to an exemplary embodiment; Fig. 9 is a logic diagram of another automated signal processing procedure according to an exemplary embodiment; Fig.10 It is a module diagram of a signal feedback control system according to an exemplary embodiment.

[0020] Fig.11 is a schematic diagram of a module of a memory according to an exemplary embodiment; Fig.12 The figure is a block diagram of an electronic device for active noise reduction according to an exemplary embodiment.

[0021] Fig.13 It is a block diagram of a computer-readable storage medium for active noise reduction according to an exemplary embodiment.

[0022] Fig.14 It is a block diagram of a computer program product for active noise reduction according to an exemplary embodiment.

[0023] Among them, the figure numbers are: 10, active noise reduction fan; 100, shell; 101, cavity; 102, air inlet; 103, air outlet; 104, air inlet cover; 105, air outlet cover; 106, air duct center; 110, hand shell; 111, battery module; 112, control component; 120, wind shell; 200, fan component; 210, motor; 211, stator component; 212, rotor component; 220, fan blade; 221, hub; 222, blade; 300, noise reduction component; 310, signal collector; 311, sound sensor; 311a, first microphone; 311b, second microphone; 311c, third microphone; 311d, fourth microphone; 320, signal processor; 321, filter; 322, signal synthesizer; 323, signal amplifier; 3 24. analog-to-digital converter; 325. computer chip; 326. amplitude comparator; 327. decibel comparator; 328. error acquisition unit; 330. signal generator; 331. sound player; 331a. first speaker; 331b. second speaker; 331c. third speaker; 331d. fourth speaker; 332. power amplifier; 340. automated signal processing system; 350. signal feedback control system; 400. memory; 410. speed and noise comparison table; 420. noise reduction signal database; 20. electronic device; 21. processor; 22. memory; 23. power supply component; 24. network interface; 25. input and output interface; 30. computer readable storage medium; 31. computer program data; 40. computer program product; 41. program instruction. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0025] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The term "and / or" in the embodiments of the present application refers to any and all possible combinations of one or more of the associated enumerated items. It should also be noted that when used in this specification, "include / comprise" specifies the presence of the stated features, integers, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, elements and / or components and / or their groups, and is intended to cover non-exclusive situations. For example, a product or device comprising a series of units is not limited to the listed units, but optionally also includes units that are not listed, or optionally also includes other units inherent to these products or devices.

[0027] In the following, the definitions of commonly used technical terms in this field are first described: 1. Active noise reduction By releasing a sound wave signal with the same or similar amplitude and opposite phase as the noise source, the noise decibel of the noise source can be reduced or eliminated, thereby achieving the effect of noise reduction.

[0028] 2. Power amplifier Power amplifier, also known as "PA", refers to an amplifier that can generate maximum power output to drive a load (such as a speaker) under given distortion conditions. The power amplifier plays a pivotal role in "organization and coordination" in the entire audio system, and to some extent dominates whether the entire system can provide good sound quality output.

[0029] 3. Loudspeakers A loudspeaker, also known as a "horn", is a very commonly used electroacoustic transducer and can be found in any electronic or electrical device that produces sound.

[0030] In order to explain in detail the technical content, technical steps, objectives and effects achieved by this application, the following is a detailed description in combination with the implementation methods and the accompanying drawings.

[0031] With the development of science and technology and people's increasing requirements for a comfortable living environment, noise reduction technology is increasingly used in electronic devices. Traditional fan devices generate significant noise during operation, which not only affects the user's comfort, but may also cause interference to sensitive places (such as offices, hospitals, etc.). Therefore, it is particularly important to develop a fan device that can effectively reduce operating noise.

[0032] The purpose of the present invention is to provide an active noise reduction fan that can effectively reduce noise during operation while generating cool air. The fan uses active noise control technology to collect noise signals in real time and generate noise reduction signals with opposite phases to achieve destructive interference of noise, thereby improving the user experience. The details are as follows: The present invention provides an active noise reduction fan 10, see Figures 1 to 4 The active noise reduction fan 10 includes a housing 100, a fan assembly 200 and a noise reduction assembly 300. The housing 100 is a portable housing having a cavity 101 inside the housing, and an air inlet 102 and an air outlet 103 that are interconnected are respectively arranged at both ends of the housing 100; the fan assembly 200 is arranged in the cavity 101, and is used to rotate to generate wind pressure, so that air is sucked from the air inlet 102 through the cavity 101 and blown out from the air outlet 103; the noise reduction assembly 300 is arranged in the cavity 101, and is used to collect noise signals inside and outside the cavity 101 in real time when the fan assembly 200 is running, and send noise reduction signals according to the noise signals.

[0033] For housing 100, please continue to refer to Figure 1 and Figure 2 The housing 100 is a user-friendly portable housing, which is carefully designed in structure to be compact and easy to carry. A cavity 101 for storing the fan assembly 200 and the noise reduction assembly 300 is provided inside the housing 100, forming the basic framework of the active noise reduction fan 10.

[0034] In some embodiments, Figure 1 As shown, the appearance of the active noise reduction fan 10 is mainly presented by the shell 100. In order to facilitate the user to carry, the shell 100 includes a hand shell 110 for the user to hold, and a wind shell 120 for connecting the air inlet 102, the cavity 101 and the air outlet 103.

[0035] In some embodiments, Figure 3 and Figure 4 As shown, the air housing 120 is a hollow cylindrical structure, with a cavity 101 inside, and an air inlet 102 connected to the outside is arranged at one end of the cavity 101, and an air outlet 103 connected to the outside is arranged at the other end, wherein an air inlet cover 104 is arranged on one side of the air inlet 102, and an air outlet cover 105 is arranged on one side of the air outlet 103, so that air can be sucked into the cavity 101 from the air inlet 102 through the air inlet cover 104, and then discharged from the air outlet cover 105 through the air outlet 103, so as to improve the overall air outlet efficiency of the device. At the same time, the mini design of the cavity 101 ensures the flexibility of the device when in use.

[0036] In some embodiments, the air inlet 102 and the air outlet 103 are respectively arranged at the two ends of the air shell 120, the cross-sectional shapes of the air inlet 102 and the air outlet 103 are both circular, and the axes of the air inlet 102, the air outlet 103 and the cavity 101 are the same straight line.

[0037] In the embodiment of the present application, the cross-sections of the cavity 101 and the air inlet 102 and the air outlet 103 are circular in order to ensure uniform suction and keep the outer dimensions consistent without using different angles. In addition, the wall thickness of the wind shell 120 can be kept consistent, thereby ensuring the overall strength of the wind shell 120. In some embodiments, the cross-section of the cavity 101 can be elliptical or polygonal, the cross-sections of the air inlet 102 and the air outlet 103 can be waist-shaped or rectangular or other polygons, and the positions of the air inlet 102 and the air outlet 103 can be set away from the axis of the cavity 101. The present application does not make specific limitations here.

[0038] The axis of the wind housing 120 is the central axis direction of the cylinder, and the airflow direction of the fan assembly 200 for the active noise reduction fan 10 during operation is parallel to the axis. In other embodiments, when the wind housing 120 is not cylindrical, the axis of the wind housing 120 is the extension direction of the main structure, and the airflow direction is parallel to the axis. A buffer sleeve (not numbered, the same below) is also wrapped around the outside of the wind housing 120. Of course, in other embodiments, the buffer sleeve may not be provided.

[0039] In some embodiments, a battery module 111 and a control component 112 are provided in the hand shell 110, and a fan component 200 and a noise reduction component 300 are provided in the fan shell 120. Among them, the battery module 111 (such as a battery) provided in the hand shell 110 of the active noise reduction fan 10 for supplying power to various components can be logically connected to the noise reduction component 300 through a power management system, so as to realize functions such as charging, discharging, and power consumption management through the power management system.

[0040] like Figure 1 and Figure 2 As shown, in one embodiment, the length of the hand shell 110 is 52-62 mm, the width of the hand shell 110 is 25.5-35.5 mm, the height of the hand shell 110 is 96.6-106.6 mm, and the overall volume of the hand shell 110 is small, so that the hand shell 110 is easy for the user to hold.

[0041] Regarding the fan assembly 200, the fan assembly 200 includes a motor 210 and fan blades 220. The control assembly 112 controls the battery module 111 to supply power to the motor 210. The motor 210 drives the fan blades 220 to rotate to generate wind pressure, thereby sucking air from the air inlet 102 through the cavity 101 and blowing it out from the air outlet 103.

[0042] In some embodiments, the fan blade 220 is received in the cavity 101 and disposed on a side close to the air inlet 102. The motor 210 includes a stator assembly 211 and a rotor assembly 212. The outer diameter of the motor 210 is smaller than the inner diameter of the cavity 101. The motor 210 is installed inside the cavity 101.

[0043] In some embodiments, the fan blade 220 includes a hub 221 and a plurality of blades 222 arranged at intervals around the outside of the hub 221. The outer diameter of the motor 210 is smaller than the maximum inner diameter of the hub 221, so a portion of the motor 210 can also be accommodated inside the hub 221. In this embodiment, the hub 221 increases radially from back to front, the wind shell 120 remains unchanged radially from back to front, and the maximum diameter of the hub 221 is not greater than the diameter of the wind shell 120. The wind generated by the rotation of the fan blade 220 can flow smoothly to the outside of the wind shell 120, reducing wind resistance and wind loss. In other embodiments, the maximum diameter of the hub 221 differs from the diameter of the wind shell 120 by less than 2 mm, which can also achieve the effect of reducing wind resistance and wind loss.

[0044] like Figure 3 and Figure 4 As shown, in one embodiment, the rotor assembly 212 includes a rotating shaft, a bearing, a magnetic ring and a yoke. The bearing is arranged in the bearing seat, and one end of the rotating shaft is fixed in the bearing seat through the bearing. The magnetic ring is fixed to the radial inner side of the yoke, the yoke is fixedly connected to the rotating shaft, and the yoke and the magnetic ring are arranged on the radial outer side of the bearing seat. The stator assembly 211 is arranged between the bearing seat and the magnetic ring, and the other end of the rotating shaft is fixedly connected to the fan blade 220. In other words, the magnetic ring is arranged on the radial outer side of the stator assembly 211, and the motor 210 is an outer rotor motor. In addition, the magnetic ring is fixed to the radial inner side of the yoke, and the yoke is fixedly connected to the rotating shaft. When the stator assembly 211 drives the magnetic ring to rotate, at the same time, the magnetic ring drives the yoke, and the yoke drives the rotating shaft to rotate. Therefore, the magnetic ring or the yoke does not need to be connected to the motor 210, and the motor 210 is fixedly connected to the motor 210 through the other end of the rotating shaft, and the rotating shaft drives the motor 210 to rotate.

[0045] like Figure 3 and Figure 4 In one embodiment, the bearing includes a first bearing located in the front, a second bearing located in the rear, and a buffer disposed between the first bearing and the second bearing. The front end of the inner wall of the cavity 101 directly abuts the second bearing, or an elastic member is disposed between the front end of the inner wall and the second bearing. The buffer member may be a single spring, or may be composed of a spring and a rubber sleeve, or other elastic materials. The elastic member may be a spring, or other elastic materials.

[0046] In some embodiments, the active noise reduction fan 10 is applied to a high-speed motor whose operating speed exceeds a preset speed; wherein the high-speed motor includes a high-speed three-phase motor.

[0047] Specifically, the active noise reduction fan 10 can be used for a high-speed motor whose operating speed exceeds a preset speed (for example, above 12,000 rpm). Such a high-speed motor is prone to generate relatively high noise during actual operation, so that the active noise reduction fan 10 can be used for active noise reduction control. In some preferred embodiments, the high-speed motor can be a high-speed three-phase motor, which can provide sufficient power and speed to ensure the wind force of the active noise reduction fan 10. When using a high-speed three-phase motor, in order to ensure a good overall shock absorption effect, a buffer can be provided on the inner wall of the housing, which can timely absorb and reduce the vibration caused by the high-speed three-phase motor, so that the active noise reduction fan 10 can continue to rotate at a high speed stably.

[0048] like Figure 3 , Figure 4 As shown, in one embodiment, the motor 210 is a three-phase high-speed motor, and the motor 210 also includes a drive plate. A fixing hole is provided inside the wind housing 120, and the drive plate is provided with a fixing opening. The fixing member passes through the fixing opening and is fixed to the fixing hole, thereby fixing the drive plate to the wind housing 120.

[0049] Regarding the noise reduction component 300, the noise reduction component 300 includes a signal collector 310, a signal processor 320 and a signal generator 330. The signal collector 310 is arranged in the cavity 101, and is used to collect noise signals in real time when the fan assembly 200 is running; the signal processor 320 is arranged in the cavity 101 and is electrically connected to the signal collector 310, and is used to obtain noise signals and generate signal generation instructions according to the noise signals; the signal generator 330 is arranged in the cavity 101 and is electrically connected to the signal processor 320, and is used to obtain signal generation instructions and send noise reduction signals according to the signal generation instructions.

[0050] In some embodiments, the noise signal collected by the signal collector 310 is a dynamic comprehensive noise signal including air intake noise, air outlet noise, fan blade noise and / or motor noise; wherein the air intake noise and air outlet noise are respectively the noise signals generated by the housing 100 when air is intake and air is outlet, and the fan blade noise and motor noise are respectively the noise signals generated by the fan blades 220 and the motor 210 of the fan assembly 200 when they are in operation.

[0051] Specifically, during the operation of the fan assembly 200, the air inlet 102 and the air inlet cover 104 of the housing 100 will inhale a large amount of air, causing the air inlet cover 104 and the outer contour of the air inlet to generate an air inlet noise of corresponding magnitude. Or during the operation of the fan assembly 200, the air outlet 103 and the air outlet cover 105 of the housing 100 will also discharge a large amount of air, causing the air outlet cover 105 and the outer contour of the air outlet to generate an air outlet noise of corresponding magnitude. Or during the operation of the fan assembly 200, the rotation process of the fan blades 220 will move with the air, thereby generating pressure pulsation, thereby generating a fan blade noise of corresponding magnitude. Or during the operation of the fan assembly 200, when the rotor of the motor 210 cuts the magnetic lines of force, the friction between the rotor and the stator will generate a motor noise of corresponding magnitude. Therefore, the above four main static noise signals will dynamically form a comprehensive noise signal and be transmitted to the user's hearing system when the user uses the active noise reduction fan 10 (for example, when the user holds the active noise reduction fan 10 while walking, running, or staying still). In some embodiments, the signal collector 310 follows the user's usage scenario, collects the comprehensive noise signal dynamically composed of the above-mentioned air intake noise, air outlet noise, fan blade noise and / or motor noise in real time, and sends it to the signal processor 320 for detailed analysis and processing.

[0052] In some embodiments, the air intake noise includes the static air intake noise generated by the active noise reduction fan 10 when in fixed use and the dynamic air intake noise generated when the user shakes it; the air outlet noise includes the static air outlet noise generated by the active noise reduction fan 10 when in fixed use and the dynamic air outlet noise generated when the user shakes it; the fan blade noise includes the static fan blade noise generated by the active noise reduction fan 10 when in fixed use and the dynamic fan blade noise generated when the user shakes it; the motor noise includes the static motor noise generated by the active noise reduction fan 10 when in fixed use and the dynamic fan blade noise generated when the user shakes it.

[0053] Specifically, in the actual application scenario of the active noise reduction fan 10, it can have a variety of usage states, and the dynamic integrated noise signal generated in each usage state is different. For example, when the user places it on a desktop as a desktop fan, the active noise reduction fan 10 is in a stationary state, and the dynamic integrated noise signal generated is static noise, or when the user holds it and moves it at an irregular speed and direction, the active noise reduction fan 10 is in an irregular running state, and the dynamic integrated noise signal generated is dynamic noise.

[0054] In some embodiments, after the signal collector 310 collects the noise signal, the noise signal is transmitted to the signal processor 320. The signal processor 320 can extract characteristics such as amplitude, frequency and phase in the noise signal, and generate a signal generation instruction based on the collected noise signal. The signal generation instruction can instruct the signal generator 330 to send a noise reduction signal to eliminate the noise signal.

[0055] In one embodiment, within a preset error tolerance range, the noise reduction signal has an opposite phase to the noise signal and the same frequency and amplitude, and is used to destructively interfere with the noise signal to achieve active noise control of the fan assembly 200 .

[0056] Specifically, the sound is composed of a certain spectrum. The spectrum of the noise reduction signal is exactly the same as the noise signal to be eliminated, but the phase is just opposite, that is, the phase difference is 180°, which can completely cancel out the noise signal. In this way, after the interference and interference of the noise reduction signal, the new sound wave generated can be so weak that it is inaudible to the human ear, thereby reducing the impact of the motor's noise signal on humans.

[0057] It should be understood that since the signal acquisition equipment or environmental noise measurement may be affected by external factors, such as background noise, temperature changes, etc., the signal acquisition may be inaccurate, or different noise reduction algorithms have their scope of application and limitations. Some algorithms may not be able to effectively process noise in all frequency ranges, resulting in inaccurate noise reduction frequency generation effect, or the structures around the fan (such as walls, floors and other objects) can affect the propagation characteristics of sound waves, causing reflection, diffraction or resonance, thereby changing the signal acquisition effect, and ultimately resulting in the generated noise reduction signal and the noise signal not being exactly 180° out of phase, and / or the frequency and amplitude being not exactly the same. Therefore, a preset error tolerance range can be set. As long as the generated noise reduction signal and the noise signal are within the error tolerance range, it is considered that the two have opposite phases and the same frequency and amplitude.

[0058] In some embodiments, the signal processor 320 can simultaneously receive noise signals acquired by the multi-channel signal collector 310 , and can also output multi-channel signal generation instructions to the signal generator 330 , that is, an active noise reduction fan 10 can include multiple groups of noise reduction components 300 .

[0059] The way in which each unit in the noise reduction component 300 receives and transmits signals may be wireless or wired, that is, the noise reduction component 300 may perform active noise reduction control on multiple target areas in the active noise reduction fan 10 at the same time.

[0060] Specifically, in a possible implementation, the signal collector 310 and the signal generator 330 are both electrically connected to the signal processor 320 , and the signal processor 320 is configured to control the signal collector 310 to collect noise signals, and control the signal generator 330 to play noise reduction signals.

[0061] Therefore, the signal processor 320 can control multiple signal collectors 310 to collect noise signals. After the signal processor 320 performs feature extraction and analysis processing on the collected noise signals and generates signal generation instructions, the signal processor 320 can control multiple signal generators 330 to play corresponding noise reduction signals respectively, thereby offsetting the noise signals.

[0062] In another possible implementation, the noise reduction component 300 provided in the embodiment of the present application may further include a wireless communication component, and the signal processor 320, the signal collector 310 and the signal generator 330 are all electrically connected to the wireless communication component.

[0063] In this way, the signal processor 320 can send signal generation instructions to the multiple signal collectors 310 and the multiple signal generators 330 through wireless communication, so that the noise reduction component 300 is more convenient to use.

[0064] In a specific implementation, the wireless communication component includes at least one of a Bluetooth module, a WiFi module, and a 5G module.

[0065] In order to facilitate signal transmission, the wireless communication component adopts a wireless communication method, which may include one or more of a Bluetooth module, a WiFi module and a 5G module. A WiFi module is set in the wireless communication component to connect the signal processor 320, the signal collector 310 and the signal generator 330 directly to the Internet using WiFi, so that the signal processor 320, the signal collector 310 and the signal generator 330 can communicate. The Bluetooth module is a short-range wireless communication technology that replaces the data cable. Bluetooth supports point-to-point and point-to-multipoint communication. The Bluetooth module wirelessly connects the signal processor 320, the signal collector 310 and the signal generator 330 into a micro network, thereby realizing fast and convenient communication between these modules. 5G is a new generation of broadband mobile communication technology with high speed, low latency and large connection characteristics. The 5G module is set in the wireless communication component to realize the interconnection of the signal processor 320, the signal collector 310 and the signal generator 330, thereby realizing the fast communication between the control signal processor 320 and the signal generator 330. In the specific implementation, it can be set according to the actual use situation, and this embodiment is not limited to this.

[0066] In a specific implementation scenario, the working principle of the active noise reduction fan 10 can be as follows: when the active noise reduction fan 10 is started, the main controller initializes all components; then the signal processor 320 reads the noise signal sent by at least one signal collector 310, and if the noise signal sent by the signal collector 310 is not detected, the detection continues. If a noise signal is detected, the signal processor 320 first uses FFT transformation to analyze the frequency, amplitude and phase of each noise signal, and then generates a signal generation instruction based on the analyzed frequency, amplitude and phase of the noise, and sends the signal generation instruction to the corresponding matching signal generator 330 to instruct the signal generator 330 to send a noise reduction signal with the same frequency and amplitude as the noise signal, but opposite phase, so as to eliminate the noise signal.

[0067] The technical effects of the above scheme are: on the one hand, the fan assembly and the noise reduction assembly are stored in the cavity through a portable shell, which greatly reduces the physical volume of the fan, makes the equipment easy to carry, suitable for use in various occasions, and improves the portability and operability of the active noise reduction fan; on the other hand, by distinguishing from the prior art, this scheme can dynamically analyze various noise signals, including air intake noise, air outlet noise, fan blade noise and / or motor noise, through reasonable design of the function of the noise reduction component, so as to collect the dynamic comprehensive noise signal generated inside and outside the cavity in real time when the fan assembly is running, and send out a corresponding noise reduction signal according to the dynamic comprehensive noise signal, thereby realizing active noise control of the fan assembly to reduce the noise level when the fan is running.

[0068] Those skilled in the art will understand that Figures 1 to 4 The active noise reduction fan shown in the figure is only a block diagram of a partial structure related to the present application scheme, and does not constitute a limitation on the noise reduction fan on which the present application scheme is used. The specific noise reduction component may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0069] In one embodiment, the signal collector 310 includes at least one sound sensor 311; wherein the at least one sound sensor 311 is disposed at at least one corresponding target point in the cavity 101 to collect noise signals near each target point in real time; Among them, the sound sensors 311 dispersedly arranged at various target points in the cavity 101 are used to collect noise signals generated by relevant parts of the fan assembly 200 during operation. For example, during the operation of the fan assembly 200, the fan blades 220 will move with the air during rotation, thereby generating pressure pulsation, thereby generating noise of corresponding magnitude. Or during operation, the torque generated by the fan blades 220 will also generate noise of corresponding magnitude in the process of being transmitted to the motor 210 through the transmission mechanism, mainly including bearing noise, gear noise and motor noise. And when the rotor of the motor 210 cuts the magnetic lines of force, the rotor and the stator will generate noise of corresponding magnitude due to friction. Or when the wind is strong, the short circuit of the motor 210 will also generate abnormal noise, and aerodynamic noise will be generated due to the interaction between high-speed airflow, unstable airflow and airflow and the blades 222. Therefore, the sound sensors 311 at various parts can be used to collect the above-mentioned noise signals.

[0070] In some embodiments, the target point positions include at least the edge position of the air inlet 102 , the edge position of the air outlet 103 , the vicinity of the motor 210 , the vicinity of the fan blades 220 , and the vicinity of the air duct center 106 .

[0071] For details, please continue as Figure 3 As shown, since the noise of the fan assembly 200 is mainly generated when the fan blades 220 rotate, in a possible implementation, the multiple sound sensors 311 include a first microphone 311a and a second microphone 311b, the first microphone 311a is arranged on the blades 222 of the fan blades 220, and is constructed to collect the noise signal of the blades 222 of the fan blades 220, and the second microphone 311b is arranged on the hub 221 of the fan blades 220, and is constructed to collect the noise signal of the hub 221.

[0072] In this way, the first microphone 311a can collect the noise signal of the blade 222 of the fan blade 220, and transmit the noise signal to the signal processor 320 to extract the characteristics of the noise signal such as the amplitude, frequency and phase, and generate a noise reduction signal for canceling the noise signal through the signal generator 330, thereby partially eliminating or completely eliminating the noise signal generated by the blade 222 of the fan blade 220 when rotating. Similarly, the second microphone 311b can collect the noise signal of the hub 221 of the fan blade 220, and transmit the noise signal to the signal processor 320 to extract the characteristics of the noise signal such as the amplitude, frequency and phase, and generate a noise reduction signal for canceling the noise signal based on these characteristics using the signal generator 330, thereby partially eliminating or completely eliminating the noise signal generated by the hub 221 of the fan blade 220 when rotating.

[0073] Please continue as Figure 3As shown, in addition to the large noise generated by the hub 221 and the blades 222 during rotation, the rotor assembly 212 of the motor 210 also generates noise signals when cutting the magnetic lines of force, and the friction between the rotor assembly 212 and the stator assembly 211. In some embodiments, the multiple sound sensors 311 also include a third microphone 311c, which is disposed on the inner wall near the motor 210 in the cavity 101 and is constructed to collect the noise signal of the motor 210.

[0074] In this way, the third microphone 311c can collect the noise signal of the motor 210 of the fan assembly 200, and transmit the noise signal to the signal processor 320 to extract the characteristics of the noise signal such as amplitude, frequency and phase, and use the signal generator 330 to generate a noise reduction signal for offsetting the noise signal based on these characteristics, thereby partially eliminating or completely eliminating the noise signal generated by the motor 210 of the fan assembly 200 during operation.

[0075] In other embodiments, although the related art reduces the noise generated when the air circulates in the cavity 101 by improving the structure of the wind shell 120, some noise is still inevitably generated when the air circulates in the cavity 101. Therefore, in some embodiments, the multiple sound sensors 311 also include a fourth microphone 311d. There can be multiple fourth microphones 311d, and they are arranged on the circulation path of the air in the cavity 101. For example, the fourth microphone 311d is respectively arranged on the inner walls near the air inlet 102, the air outlet 103 and the air duct center 106 in the cavity 101, and is constructed to collect noise signals of the air inlet 102, the air outlet 103 and the air duct center 106.

[0076] In this way, the fourth microphone 311d can collect the noise signal generated when the air circulates in the cavity 101, and transmit the noise signal to the signal processor 320 to extract the characteristics of the noise signal such as amplitude, frequency and phase, and use the signal generator 330 to generate a noise reduction signal for offsetting the noise signal based on these characteristics, thereby eliminating the noise signal generated at the air inlet 102, air outlet 103 and air duct center 106 in the cavity 101 when the fan assembly 200 is running.

[0077] In one embodiment, if Figure 5 As shown, the signal processor 320 includes a filter 321, a signal synthesizer 322, a signal amplifier 323, an analog-to-digital converter 324, and a computer chip 325 which are electrically connected in sequence; The filter is used to perform real-time filtering on the static noise signals collected by each sound sensor to obtain a filtered noise signal; In some embodiments, the filtering process is to solve the frequency aliasing of the audio signal. When the analog signal is discretely collected, the filter can use a low-pass filter to sample it to obtain a filtered noise signal.

[0078] In other embodiments, the signal processor 320 includes at least a plurality of filters 321. The plurality of filters 321 include, but are not limited to, IIR (Infinite Impulse Response) filters and biquad filters. Since the biquad filter integrates the characteristics of, for example, a high-pass filter, a low-pass filter, a frequency equalization filter, a notch filter, etc., the combination of these filters 321 is used to reduce the noise frequency band of the noise signal, thereby achieving the purpose of preliminarily reducing the specific noise signal.

[0079] The signal synthesizer 322 is used to perform signal fusion processing on each filtered noise signal to obtain a dynamically composed comprehensive noise signal.

[0080] Specifically, the signal synthesizer 322 can transcode the noise signals after multi-channel filtering into a comprehensive noise signal according to the audio coding method based on object-based audio. In some embodiments, the signal synthesizer 322 is used to re-encode the noise signals after multi-channel filtering according to the NGA audio coding format (i.e., the object-based audio audio coding method), that is, transcode the noise signals after multi-channel filtering, so that all noise signals are merged into a comprehensive noise signal, so that only one decoder is needed for decoding when amplifying the signal. Among them, the object-based audio audio coding method can be AC-4, MPEG-H, DTS-UHD, but is not limited to this.

[0081] In one embodiment, the noise signals after multiple filtering can be dynamically transcoded and merged into a comprehensive noise signal through an audio mixer (Audio Mixer) or an audio interface (AudioInterface). The core principle of the audio mixer or audio interface is to dynamically generate a comprehensive audio signal by combining, adjusting and processing the amplitude and frequency response of the static noise signals after multiple filtering. In this way, multiple noise sources can be mixed in a balanced manner without losing sound quality, thereby achieving an ideal noise reduction effect.

[0082] In some embodiments, the mixer is specially designed for mixing multiple audio signals. Its basic functions include: ① Each input signal of its input channel can be connected to the mixer through an independent channel. ② Each input channel is equipped with a volume knob to adjust the volume ratio of different signals. ③ It is equipped with an equalizer to adjust the gain of each frequency band to optimize the sound quality. ④ It dynamically synthesizes all adjusted signals into a comprehensive output signal inside the mixer and outputs it through the output port of the mixer, which can be connected to devices such as speakers.

[0083] In some embodiments, the audio interface is used to convert multiple audio signals into digital signals and connect to a computer or other digital audio processing device. Its basic functions include: ① Supporting multi-channel input connection of multiple audio sources. ② It includes a converter inside to convert analog audio signals into digital signals, and may perform some basic mixing processing. ③ It can be used in conjunction with a digital audio workstation (DAW), and users can adjust the mix within the software, such as volume, pan and effects, and the final output is a single path.

[0084] The signal amplifier 323 is used to perform signal amplification processing on the integrated noise signal to obtain an integrated amplified signal.

[0085] In some embodiments, the signal amplifier 323 is used to enhance the amplitude of the integrated noise signal to improve its strength and quality during transmission, processing or output. The signal amplifier 323 can be an audio amplifier or a radio frequency amplifier, which can amplify the tiny noise signal to a sufficient level for subsequent processing or output, and by reducing noise and distortion, the signal amplifier 323 can improve the clarity and reliability of the noise signal. In addition, the signal amplifier 323 can help match signals between different devices to ensure that they work effectively.

[0086] The analog-to-digital converter 324 is used to perform analog-to-digital conversion on the integrated amplified signal to obtain a corresponding pulse code signal.

[0087] In some embodiments, the pulse code signal is an audio pulse code modulation (Pulse Code Modulation), or PCM signal for short.

[0088] Specifically, the analog-to-digital converter 324 (ADC) is an electronic device or circuit that converts an analog signal into a digital signal. This process is called analog-to-digital conversion, and its purpose is to make the analog signal (i.e., the integrated amplified signal) processable by a digital computer or computer chip 325.

[0089] In some embodiments, the basic steps of analog-to-digital conversion are as follows: ① Input integrated amplified signal: Usually, the integrated amplified signal is an amplified analog signal, such as the output from an audio amplifier, temperature sensor or other sensor.

[0090] ② Sampling: The analog-to-digital converter 324 detects the input analog signal at a certain sampling frequency. This frequency needs to be higher than the Nyquist frequency of the signal (generally twice the signal frequency) to ensure the integrity of the signal.

[0091] ③Quantization: Convert the sampled analog signal value into a discrete digital value. At this time, quantization error may occur.

[0092] ④Encoding: The quantized value is encoded into a digital signal, generally in binary encoding form (such as pulse code modulation, PCM), and output as a digital signal.

[0093] In some embodiments, pulse code modulation (PCM) is a digital signal representation method widely used in digital representation of audio, video and other analog signals. Its characteristics include: signal discretization: PCM converts continuous analog signals into a series of discrete digital values ​​through sampling and quantization; energy consumption and bandwidth efficiency: digital signals encoded by PCM are less susceptible to noise interference during transmission, and the transmission bandwidth can be reduced through compression technology.

[0094] The computer chip 325 is used to perform phase inversion processing on the pulse coding signal to obtain inverted signal data, and generate a signal generation instruction based on the inverted signal data.

[0095] In one embodiment, the audio generation instruction includes pulse code data having a phase opposite to that of the pulse code signal and having the same frequency and amplitude as that of the pulse code signal.

[0096] In some embodiments, the computer chip 325 can determine the frequency spectrum range and size corresponding to the pulse coded signal by analyzing the Hanning window frequency spectrum of the pulse coded signal, and calculate the corresponding inverted signal data.

[0097] Specifically, when analyzing the spectrum of a pulse coded signal, using a Hanning window is an effective means to reduce spectrum leakage and improve the accuracy of spectrum estimation. The specific steps are as follows: 1. Signal preprocessing Before processing the pulse coded signal, the computer chip 325 applies a Hanning window function to the original signal for window function processing. This can be achieved by the following formula:

[0098] Where N is the length of the signal.

[0099] 2. Calculate the spectrum The computer chip 325 performs a fast Fourier transform (FFT) on the signal processed by the window function to calculate the spectrum. The fast Fourier transform can be implemented by the following formula:

[0100] Where X[k] is the frequency spectrum and x[n] is the time domain signal after window function processing.

[0101] 3. Extract frequency and amplitude The computer chip 325 performs spectrum analysis on the spectrum according to the result of FFT to extract the frequency and amplitude of the signal. The steps include: First calculate the magnitude spectrum: , and then find the main frequency components and their corresponding amplitudes.

[0102] 4. Calculate the inverted signal data The computer chip 325 calculates the anti-phase signal data: To obtain an anti-phase signal with an opposite phase, the amplitude A and phase φ of a certain frequency f are first determined. The anti-phase signal can be expressed as: ; This means that if the complex number representation of the original signal at frequency f is: ; Thus, the inverted signal data can be expressed as: .

[0103] 5. Apply inverted signal data The computer chip 325 generates a signal generation instruction according to the inverted signal data, so that when the inverted signal in the signal generation instruction is superimposed with the noise signal, they will cancel each other out within the same frequency range, thereby achieving the effect of noise reduction or interference suppression.

[0104] In some embodiments, the computer chip 325 can be an integrated circuit chip with signal processing capabilities. The above-mentioned computer chip 325 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), an embedded ARM or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. Among them, the general-purpose processor can be a microprocessor; the computer chip 325 can also be any conventional processor, etc., which is not specifically limited in this application.

[0105] In one embodiment, the signal generator 330 includes at least one sound player 331 and a power amplifier 332 disposed corresponding to each target point; The power amplifier 332 is used to amplify the inverted signal data carried by the signal generation instruction to obtain a power amplified signal; Specifically, the power amplifier 332 includes a power amplifier circuit, which includes a signal input end and a signal output end. The signal input end of the power amplifier circuit is electrically connected to the computer chip 325, wherein the computer chip 325 includes multiple signal output ports for outputting the generated signal generation instructions. The signal input end of the power amplifier circuit is electrically connected to the signal output port of the computer chip 325, and the signal output end of the power amplifier circuit is electrically connected to the sound player 331. The power amplifier circuit is used to amplify the inverted signal data generated by the computer chip 325 that has an opposite phase and the same amplitude as the collected noise.

[0106] The sound player 331 is used to send out a noise reduction signal with a phase opposite to that of the comprehensive noise signal and the same frequency and amplitude according to the power amplification signal.

[0107] Specifically, after the computer chip 325 calculates the anti-phase signal data, it needs to be played out through the sound player 331 so that the noise reduction signal interferes with or interferes with the noise signal, thereby offsetting part or all of the noise signal.

[0108] In some embodiments, the signal generator 330 performs digital-to-analog conversion and signal amplification on the inverted signal data input by the computer chip 325 and then outputs it to the sound player 331. The inverted signal data is mainly used to suppress the noise signal of the original environment. This process is called active noise reduction. The principle of active noise reduction is as follows: Figure 6 shown.

[0109] Therefore, the signal generator 330 may include a plurality of sound players 331 , and the sound players 331 and the sound sensors 311 form a one-to-one correspondence in position, so that the noise reduction signals played by different sound players 331 can eliminate the corresponding noise signals.

[0110] For details, please continue as Figure 3 As shown, since the noise of the fan assembly 200 is mainly generated when the fan blades 220 rotate, in a possible implementation, the multiple sound players 331 include a first speaker 331a and a second speaker 331b, the first speaker 331a is arranged on the blade 222 of the fan blade 220, and is constructed to play an inverted noise reduction signal to the running blade 222, and the second speaker 331b is arranged on the hub 221 of the fan blade 220, and is constructed to play an inverted noise reduction signal to the running hub 221.

[0111] In this way, the first speaker 331a can generate an instruction based on the signal sent by the computer chip 325, and play a reverse noise reduction signal to the running blade 222 to cancel the noise signal generated in the target area, thereby partially eliminating or completely eliminating the noise generated by the blade 222 of the fan blade 220 when rotating. Similarly, the second speaker 331b can generate an instruction based on the signal sent by the computer chip 325, and play a reverse noise reduction signal to the running hub 221 to cancel the noise signal generated in the target area, thereby partially eliminating or completely eliminating the noise generated by the hub 221 of the fan blade 220 when rotating.

[0112] Please continue as Figure 3 As shown, in addition to the large noise generated by the hub 221 and the blades 222 when rotating, the rotor assembly 212 of the motor 210 also generates noise signals when cutting the magnetic lines of force, and the friction between the rotor assembly 212 and the stator assembly 211. In some embodiments, the multiple sound players 331 also include a third speaker 331c, which is arranged on the inner wall near the motor 210 in the cavity 101 and is constructed to play an anti-phase noise reduction signal to the running motor 210.

[0113] In this way, the third speaker 331c can generate instructions based on the signal sent by the computer chip 325 to play an inverted noise reduction signal to the running motor 210 to offset the noise signal generated by the target area, thereby partially eliminating or completely eliminating the noise generated by the motor 210 of the fan assembly 200 during operation.

[0114] In other embodiments, although the related art reduces the noise generated when air flows through the cavity 101 by improving the structure of the wind shell 120, some noise is still inevitably generated when the air flows through the cavity 101. Therefore, in some embodiments, the multiple sound players 331 also include a fourth speaker 331d. There can be multiple fourth microphones 331d, and they are arranged on the flow path of the air in the cavity 101. For example, the fourth speakers 331d are respectively arranged on the inner walls near the air inlet 102, the air outlet 103 and the air duct center 106 in the cavity 101, and are constructed to play anti-phase noise reduction signals to the target areas near the air inlet 102, the air outlet 103 and the air duct center 106.

[0115] In this way, the fourth speaker 331d can generate instructions based on the signal sent by the computer chip 325, and play the opposite phase noise reduction signal to the target areas near the air inlet 102, the air outlet 103 and the air duct center 106, so as to offset the noise signal generated by the target area, thereby eliminating the noise generated by the air inlet 102, the air outlet 103 and the air duct center 106 in the cavity 101 when the fan assembly 200 is running.

[0116] In other embodiments, the sound player 331 for each target area may further include a plurality of noise reduction speakers, and at least two of the noise reduction speakers are oriented in different directions.

[0117] That is to say, when collecting noise signals, multiple signal collectors 310 will collect noise signals from different parts of the fan assembly 200. In order to specifically offset different noise signals, different offset sound wave signals need to be generated and played according to the propagation directions of different noise signals. Therefore, when playing, the propagation directions of the noise reduction signals for different noise signals will also be different. Therefore, the sound playback directions of multiple noise reduction speakers are different to eliminate noise signals propagating from all directions.

[0118] In some embodiments, the number of noise reduction speakers may be an even number, and the plurality of noise reduction speakers are arranged in a circle, and the directions of two opposite noise reduction speakers are away from each other.

[0119] For example, the number of noise reduction speakers can be four or six. When the number of noise reduction speakers is four, two adjacent noise reduction speakers are arranged at a 90-degree angle, and the noise reduction speakers are both facing outward. When the number of noise reduction speakers is six, two adjacent noise reduction speakers are arranged at a 60-degree angle, and the two opposite noise reduction speakers are facing back to back. In this way, multiple noise reduction speakers can play noise reduction wave signals in all directions to better eliminate noise.

[0120] In one embodiment, see Figure 7 and Figure 8 The signal processor 320 further includes an amplitude comparator 326 , an input end of the amplitude comparator 326 is electrically connected to the analog-to-digital converter 324 , and an output end of the amplitude comparator 326 is electrically connected to the computer chip 325 .

[0121] The amplitude comparator 326 is used to obtain the pulse coded signal and extract the corresponding noise amplitude sequence from the pulse coded signal, so as to compare the noise amplitude sequence with a preset amplitude threshold to obtain a first comparison result.

[0122] In some embodiments, the computer chip 325 is also used to obtain a first comparison result, and when the first comparison result is that the noise amplitude sequence is greater than the amplitude threshold, perform phase inversion processing on the pulse coded signal to obtain inverted signal data, or, when the first comparison result is that the noise amplitude sequence is less than or equal to the amplitude threshold, end the noise reduction program.

[0123] Specifically, the amplitude comparator 326, the analog-to-digital converter 324 and the computer chip 325 can form an automatic signal processing system 340 based on amplitude comparison and active noise reduction. The following will analyze the various parts of the automatic signal processing system 340 and its workflow in detail.

[0124] 1. Introduction to system components Analog-to-digital converter 324 (ADC): used to convert analog signals (i.e., integrated noise signals) into digital signals for subsequent processing modules.

[0125] Amplitude Comparator 326: It is used to obtain the pulse code signal from the analog-to-digital converter. It extracts the amplitude sequence of the noise and compares it with the preset amplitude threshold. This process allows the system to determine whether the current noise intensity requires noise reduction measures.

[0126] Computer chip 325 (Computer Chip): used to receive the first comparison result output by the amplitude comparator and perform corresponding logic operations. According to the comparison result, it is determined whether to perform phase inversion processing on the pulse coding signal, so as to generate inverted signal data for active noise reduction.

[0127] 2. System workflow Signal input and conversion: The noise signal is first converted into a digital pulse code signal by the analog-to-digital converter 324 for use by the amplitude comparator 326.

[0128] Amplitude extraction and comparison: The amplitude comparator 326 extracts the amplitude sequence of the noise from the pulse coded signal. The extracted amplitude sequence is compared with the preset amplitude threshold to generate a first comparison result: if the amplitude sequence is greater than the threshold, noise reduction processing is required; if the amplitude sequence is less than or equal to the threshold, the noise reduction process is terminated.

[0129] Inverted signal generation: If the first comparison result indicates that the noise amplitude sequence is greater than the amplitude threshold, the computer chip 325 will start phase inversion processing, including processing the pulse coded signal to generate inverted signal data. The inverted signal data is used for active noise reduction to offset the original noise signal.

[0130] Program end: If the first comparison result shows that the noise amplitude sequence is less than or equal to the set amplitude threshold, the noise reduction program will be terminated and signal processing will be stopped.

[0131] The processing logic of the automatic signal processing system 340 is that as long as the fan noise does not affect the user experience and use, the automatic signal processing system 340 may not process the fan noise, which is more beneficial to the energy saving of the active noise reduction fan 10, especially when the current power of the active noise reduction fan 10 is too low, the standby time can be further extended. Therefore, the automatic signal processing system 340 can determine whether to reduce the fan noise according to the amplitude value of the current noise signal. If the current fan noise is not enough to affect the user experience and use, active noise reduction will not be performed, otherwise active noise reduction will be performed.

[0132] 3. System functions Automated Control: The automated signal processing system 340 effectively generates an automated response program that can adjust the noise reduction strategy based on real-time changes in ambient noise.

[0133] Precise noise reduction: Through amplitude comparison and phase inversion technology, active noise reduction improves the working efficiency of the active noise reduction fan 10 under different noise conditions.

[0134] 4. System Settings Threshold setting: The appropriate amplitude threshold setting of the automated signal processing system 340 is critical. If it is set too high, it may cause unnecessary noise reduction; if it is set too low, it may cause frequent noise reduction and unnecessary processing delays.

[0135] Delay impact: The signal processing delay of the automated signal processing system 340 may affect the noise reduction effect, so the automated signal processing system 340 can be connected to the cloud to optimize the signal processing speed to ensure real-time performance.

[0136] The technical effect of the above scheme is that it can adapt to complex and changeable noise environments by combining the signal processing and intelligent control technologies through the automated signal processing system.

[0137] In one embodiment, see Figure 7 and Fig. 9 The signal processor 320 further includes a decibel comparator 327 , an input end of the decibel comparator 327 is electrically connected to the signal collector 310 , and an output end of the decibel comparator 327 is electrically connected to the computer chip 325 .

[0138] Among them, the decibel comparator 327 is used to obtain the residual noise signal collected in real time by the signal collector 310 after the signal generator 330 sends out the noise reduction signal, and extract the corresponding noise decibel value from the residual noise signal to compare the noise decibel value with the preset decibel threshold to obtain a second comparison result.

[0139] In some embodiments, the computer chip 325 is also used to obtain a second comparison result, and when the second comparison result is that the noise decibel value is greater than the decibel threshold, the motor 210 of the fan assembly 200 is reduced in speed, or when the second comparison result is that the noise decibel value is less than or equal to the decibel threshold, the noise reduction program is ended.

[0140] Specifically, in order to further accurately determine the impact of fan noise on user usage and experience, the decibel value of the fan noise can also be obtained. The decibel value of the fan noise can be used to determine whether the fan is in a normal operating state, further avoiding the problem of reduced user experience caused by fan abnormalities.

[0141] In some embodiments, the above-mentioned automatic signal processing system 340 may further include a decibel comparator 327, thereby further improving the active noise reduction technology. The various parts of the automatic signal processing system 340 and its workflow will be analyzed in detail below.

[0142] 1. Introduction to system components Signal Collector 310 (Signal Collector): used to collect residual noise signals in the environment in real time, including the noise that still exists after the noise reduction signal released by the signal generator.

[0143] Decibel comparator 327 (Decibel Comparator): is used to receive the noise signal from the signal collector 310, extract the corresponding noise decibel value, and compare it with a preset decibel threshold to generate a second comparison result.

[0144] Computer chip 325 (Computer Chip): is used to receive the second comparison result output by the decibel comparator and execute control logic to adjust the speed of the fan motor 210 to achieve further noise reduction.

[0145] 2. System workflow Signal acquisition: After the signal generator 330 sends out the noise reduction signal, the signal collector 310 starts to monitor the residual noise in the environment in real time.

[0146] Decibel extraction and comparison: The decibel comparator 327 extracts the decibel value of the noise from the collected signal. And, the extracted decibel value is compared with the preset decibel threshold, and a second comparison result is output. Among them, if the decibel value is greater than the threshold, it means that the residual noise is still strong and the power or speed of the device generating the noise needs to be reduced. If the decibel value is less than or equal to the threshold, it means that the noise has been reduced to an acceptable level and the noise reduction procedure can be terminated.

[0147] Fan motor control: If the second comparison result indicates that the noise decibel value is greater than the decibel threshold, the computer chip 325 will send a control signal to reduce the speed of the motor 210 of the fan assembly 200. This process can effectively reduce the noise generated by the operation of the motor.

[0148] Program End: If the second comparison result shows that the noise decibel value is less than or equal to the decibel threshold, the program will end and no further noise processing will be performed.

[0149] 3. System functions Dynamic Adjustment: The automated signal processing system 340 can dynamically adjust the speed of the fan motor 210 according to the real-time residual noise changes, ensuring that the volume is kept to a minimum under various environmental conditions.

[0150] Analog feedback: Through comparison and real-time feedback, the automated signal processing system 340 can effectively manage and control the response of different noise sources, enhancing the effect of active noise reduction.

[0151] 4. System Settings Decibel threshold setting: The key to success is to set a reasonable decibel threshold for the automated signal processing system 340. A threshold that is too high may cause the fan to slow down insensitively, while a threshold that is too low may not be able to effectively cope with the actual noise environment.

[0152] Fan response time: The computer chip 325 needs to respond as quickly as possible to the control of the motor 210 to adapt to the instantaneous changes in the ambient noise, thereby achieving a timely noise reduction effect.

[0153] The technical effect of the above solution is that by combining intelligent monitoring, real-time feedback and automatic control technology through the automatic signal processing system 340, it can effectively cope with environmental noise and provide a more comfortable user experience.

[0154] In some embodiments, in order to further improve the energy-saving effect, when the automatic signal processing system 340 determines that the decibel value of the residual noise in the environment is not less than the preset decibel value, the fan noise may not be reduced. In the specific application process, the automatic signal processing system 340 can detect the current use scenario of the active noise reduction fan 10. If the background noise (including the user's voice) is large, the noise reduction will not be turned on, because turning on the noise reduction will definitely consume high power, so this method can further reduce the power consumption of the mobile phone.

[0155] In other embodiments, in order to further ensure the stable operation of the active noise reduction fan 10 under low power conditions, the automatic signal processing system 340 can also determine whether the current power of the active noise reduction fan 10 is not less than a preset power; if so, the built-in motor 210 of the active noise reduction fan 10 is started, otherwise, an alarm prompt of low power is issued. Therefore, when the power is lower than the preset power, the automatic signal processing system 340 controls not to start the fan, and can prompt the user to remind.

[0156] In one implementation of the present application, the step of reducing the fan noise according to the residual signal by the automated signal processing system 340 may include: when the noise signal contains a user voice signal, using a preset noise recognition model to identify the fan noise to obtain a noise signal after voice recognition; and reducing the noise signal after voice recognition. Exemplarily, during the user use process, there is often interaction between multiple users, and the user needs to use voice. In order to further improve the recognition of fan noise and avoid eliminating the user's voice information, it is necessary to identify the fan noise. Specifically, the establishment of the noise recognition model adopts: determining the input positive samples and negative samples, wherein the positive samples are noise training sets and the negative samples are voice training sets, using the PLDA model for training, obtaining the average error, and determining it as an available noise recognition model when the average error is less than the preset error. The PLDA model is trained through positive and negative samples. When the model maturity reaches the standard, the automated signal processing system 340 identifies the fan noise through the noise recognition model, which can accurately determine the fan noise and reduce the erroneous operation of eliminating the user's voice as fan noise, thereby further improving the accuracy of fan noise elimination and improving the user experience.

[0157] The signal collector 310 picks up the residual noise after suppression, which is an analog signal; then the signal processor 320 amplifies the picked-up analog noise signal, filters out the high-frequency components in the signal with a low-pass filter, and then performs analog-to-digital conversion on the signal after filtering out the high-frequency components, and then inputs it into the automated signal processing system 340. This process generates low-frequency audio data, which is provided to the automated signal processing system 340 for re-learning and used to evaluate the active noise reduction effect.

[0158] In one embodiment, see Fig.10 The signal processor 320 also includes an error acquisition component 328, which is disposed in the cavity 101 and electrically connected to the computer chip 325, and is used to calculate the error between the noise signal and the noise reduction signal, obtain error signal data, and feed the error signal data back to the computer chip 325, so as to calibrate the noise reduction signal through the computer chip 325.

[0159] The error acquisition component 328 is configured to detect the error between the noise signal acquired by the signal collector 310 and the noise reduction signal played by the signal generator 330 .

[0160] Specifically, in order to improve the noise reduction effect of the active noise reduction fan 10, the active noise reduction fan 10 is also provided with an error collection component 328, which is used to detect the error between the noise signal collected by the signal collector 310 and the noise reduction wave signal played by the signal generator 330, and feed it back to the computer chip 325 in the signal processor 320 to calibrate the noise reduction signal, so as to further make the inverted signal data in the signal generation instruction generated by the computer chip 325 more in line with the noise reduction requirements.

[0161] In some embodiments, the error acquisition component 328, the signal acquisition device 310, the signal generator 330 and the computer chip 325 can form a signal feedback control system 350 based on a signal feedback control mechanism, and the signal feedback control system 350 is used to improve the accuracy and effect of the noise reduction system. The various parts of the signal feedback control system 350 and its workflow will be analyzed in detail below.

[0162] 1. Introduction to system components Error collector 328 (Error Collector): used to calculate the error between the two in real time, that is, the difference between the actual noise signal and the noise reduction signal generated by the signal processor, generate error signal data and feed it back to the signal processor 320.

[0163] 2. System workflow Signal input: The noise signal is captured and input to the computer chip 325 for analysis and processing.

[0164] Generating noise reduction signal: The computer chip 325 generates a noise reduction signal based on the processed data, aiming to intervene in and reduce the noise signal.

[0165] Error calculation: The error acquisition unit 328 receives the noise signal and the noise reduction signal, and calculates the error signal data through a mathematical algorithm (such as difference or other error evaluation methods). The following formula can be used: error signal data = noise signal − noise reduction signal.

[0166] Data Feedback: The calculated error signal data is fed back to the computer chip 325 to provide real-time information about the noise reduction effect.

[0167] Signal calibration: The computer chip 325 calibrates the noise reduction signal according to the feedback error signal data. The noise reduction signal can be more effectively counteracted by adjusting the amplitude, phase or frequency of the noise reduction signal. The calibrated noise reduction signal is output again to improve the noise reduction performance of the system.

[0168] 3. System functions Real-time feedback: The signal feedback control system 350 can quickly respond to the noise reduction effect through the real-time feedback of the error acquisition component 328, thereby making necessary adjustments and improving the noise reduction accuracy.

[0169] Adaptive calibration: The signal processor 320 can dynamically adjust the noise reduction signal according to the error signal calculated in real time to adapt to different noise environments and improve the adaptability and effect of active noise reduction.

[0170] 4. System Settings Calculation delay: The delay between error calculation and signal feedback control system 350 may affect the noise reduction effect. Therefore, the algorithm can be optimized to reduce the response time.

[0171] Noise mode setting: Different noise signal characteristics may require different noise reduction strategies, so the signal processor 320 can be designed to flexibly cope with a variety of noise modes.

[0172] Environmental adaptability setting: ensure that the signal feedback control system 350 maintains an effective noise reduction function under different environmental conditions (such as different types of noise, background changes, etc.).

[0173] The technical effect of the above technical solution is that by designing a feedback control system and utilizing the coordinated work of the error acquisition component and the computer chip, the performance and flexibility of the active noise reduction system can be greatly improved. This design effectively ensures the real-time and accuracy of the noise reduction signal and improves the user experience.

[0174] In one embodiment, see Fig.11The active noise reduction fan 10 also includes a memory 400, which is arranged in the cavity 101 and is used to store a preset speed and noise comparison table 410 and a noise reduction signal database 420; wherein the speed and noise comparison table 410 is used to characterize the mapping relationship between the speed of the motor 210 in the fan assembly 200 and the corresponding noise signal generated by the fan assembly 200; the noise reduction signal database 420 is used to store noise reduction signals with opposite phases, the same frequency and amplitude as multiple preset noise signals.

[0175] Among them, the noise reduction component 300 is also used to obtain the real-time speed of the motor 210 when the fan component 200 is running, and determine the target noise signal matching the real-time speed according to the speed and noise comparison table 410, and determine the target noise reduction signal matching the target noise signal from the noise reduction signal database 420, so as to perform active noise control on the fan component 200 based on the target noise reduction signal.

[0176] In some embodiments, the memory 400 can be used to store software programs and various data. The memory 400 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function), etc.; the data storage area may store data (such as audio data) created according to the use of the active noise reduction fan 10, etc. In addition, the memory 400 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0177] According to an embodiment of the present application, the signal collector 310 may be one or more devices for collecting noise-related signals. In the present application, the signal collector 310 may acquire noise-related signals through two methods: the sound sensor 311 and the memory 400. The signal collector 310 is a device placed in the noise control target area around the motor 210 to collect noise in real time, and the memory 400 is a storage device that pre-stores the noise characteristic signal of the active noise reduction fan 10.

[0178] When the signal collector 310 acquires a noise signal through the sound sensor 311, the sound sensor 311 transmits the acquired noise signal back to the signal processor 320, and the signal processor 320 analyzes the acquired noise signal and transmits it to the signal generator 330, wherein the sound sensor 311 may also directly transmit the acquired noise signal back to the memory 400 without passing through the signal processor 320, and acquire the target noise reduction signal through the noise reduction signal database 420. The sound sensor 311 may transmit the noise-related signal wirelessly or by wire, and the memory 400 may receive or output multiple noise signals at the same time.

[0179] In one embodiment, when the signal collector 310 obtains a noise signal through the memory 400, the signal collector 310 first obtains the real-time speed of the motor 210, and then sends the real-time speed to the memory 400, and determines the target noise signal that matches the real-time speed based on the speed and noise comparison table 410, and then determines the target noise reduction signal that matches the target noise signal from the noise reduction signal database 420, and finally sends the target noise reduction signal to the sound player 331, and plays the target noise reduction signal through the sound player 331 to cancel the noise of the target noise signal.

[0180] According to an embodiment of the present application, the sound player 331 may include multiple speakers. There are many types of speakers, which are divided into dynamic (electric), capacitive (electrostatic), piezoelectric (crystal or ceramic), electromagnetic (compression spring), ion and pneumatic speakers according to the transducer mechanism and structure. The multiple speakers of the sound player 331 can be installed together at various angles on the motor cabin and / or the shroud and / or the tower in different directions to form multiple speaker assemblies, and the fixed part of the speaker assembly is built into the cavity 101. Among them, each speaker can effectively control a sector area to cancel the noise in the noise control target area. According to an embodiment of the present application, for example, four groups of speaker assemblies are installed on both sides of the motor cabin and the shroud, each group of speaker assemblies includes 3 speakers, and each speaker can effectively control the sector area range of 30 degrees, then each group of speaker assemblies covers an area range of 90 degrees, and the four groups of speaker assemblies can achieve 360-degree coverage of the noise control area around the motor cabin. In addition, the multiple speakers of the sound player 331 can also be fixed on the steering platform of the motor 210. The steering platform mentioned here refers to a supporting device for installing and fixing multiple speakers and controlling the rotation direction of multiple speakers. The steering platform includes a multi-axis platform and a single-axis platform, which is usually embedded in the motor cabin and / or the shroud and / or the tower, driving the multiple speakers to rotate to fully cover the noise control target area around the motor 210. The noise control target area is the area where the impact of the noise of the motor 210 needs to be reduced, and the area can be located within a predetermined range around the motor 210.

[0181] In other embodiments, the computer chip 325 in the noise reduction component 300 can also obtain predetermined filter parameters required to reduce or eliminate the target noise signal from the memory 400 when the signal collector 310 is triggered, and pre-configure the fan component 200 according to the filter parameters.

[0182] In this embodiment, the signal collector 310 triggers the corresponding filter to perform real-time filtering on the noise signal in response to the pre-configuration of the computer chip 325, so as to reduce or eliminate the amplitude of the specific noise signal frequency band contained in the noise signal, thereby obtaining a noise-reduced audio signal. In this embodiment, the noise-reduced audio signal is an audio pulse code modulation signal.

[0183] Specifically, the analog-to-digital converter 324 in the noise reduction component 300 receives the target noise signal matched by the memory 400 and performs analog-to-digital conversion to obtain a corresponding original audio pulse code modulation signal, and sends the original audio pulse code modulation signal to the computer chip 325. The computer chip 325 analyzes the original audio pulse code modulation signal in the frequency domain, and determines the filter parameters corresponding to the target noise signal according to the analysis result.

[0184] In one embodiment, the active noise reduction fan 10 at least includes a handheld fan for wireless use, a neck-hanging fan for neck-hanging use, or a strapping fan for strapping use.

[0185] Among them, the handheld wireless fan is a portable electric fan with a wireless design, which allows users to use it without being restricted by the power cord, making it easy to carry and use. It is a variant of the handheld small fan, which highlights its wireless characteristics. The functions of the handheld wireless fan mainly include: ① Wireless and portable: powered by a built-in rechargeable battery, it can be used without plugging in, and is suitable for a variety of indoor and outdoor scenes. ② Multiple wind speed selection: The wireless small fan provides multiple wind speed settings, and users can adjust the wind intensity as needed. ③ Convenient charging: The handheld wireless small fan can be charged through a USB interface, which is convenient for charging with a mobile power supply or a computer. ④ Multi-function in one: The handheld fan can include additional functions such as spray, LED lights, and even Bluetooth speakers. ⑤ Easy to store: It is set with a lightweight design that makes it easy to put into a bag, which is very suitable for travel. The main features of the handheld wireless fan include: ① Lightweight design: The handheld fan can be made of lightweight materials, weighing between 200 grams and 500 grams, which is easy to hold for a long time. ② High safety: The handheld fan can use a bladeless design or an anti-pinch design to ensure safe use. ③ Fashion appearance: The fan has a modern design appearance with various colors and shapes, which meets the fashion needs of young people. ④ Silent operation: The fan has an optimized motor and fan design, which keeps low noise during operation, which is very suitable for users who need a quiet environment. ⑤ Long battery life: The built-in battery of the fan can provide several hours of continuous use to meet daily needs. Therefore, this kind of handheld wireless fan is very suitable for use in hot weather, especially for outdoor activities, travel or just enjoying a comfortable cool breeze at home.

[0186] Among them, the neck-hanging fan is a portable fan that can be hung on the neck for use. This design allows the fan to be close to the body, providing a more direct cooling effect, which is very suitable for hot summer or outdoor activities. The functions of the neck-hanging fan mainly include: ① Free use of hands: Because it is hung on the neck, the user's hands can be used freely without having to hold the fan. ② Convenient to carry: The lightweight design makes it suitable for carrying with you and suitable for use in various occasions such as travel, sports, and work. ③ Multiple wind speeds: The neck-hanging fan can provide a variety of wind speed settings, and different wind speeds can be selected as needed. ④ Charging function: The neck-hanging fan can be charged through the USB interface, and can be charged using a mobile power supply or a computer. ⑤ 360-degree rotation: The neck-hanging fan can be designed with an adjustable wind direction, so that the angle of the fan can be freely rotated to meet personal needs. The main features of the neck-hanging fan include: ① Comfortable to wear: It can be made of soft materials or lightweight design to ensure that it will not cause burden or discomfort when worn. ②Silent design: The optimized motor and fan design of this neck-hanging fan reduces noise and is suitable for use in quiet environments, such as offices or libraries. ③Multiple styles: This neck-hanging fan is available in a variety of styles and colors, which can be matched with different clothing and occasions. ④High safety: This neck-hanging fan can adopt a bladeless design to avoid injuries caused by fingers touching the fan blades. ⑤Long-lasting battery life: The battery configured with this neck-hanging fan has a long battery life and can support several hours of continuous use, meeting most daily needs. Therefore, this type of neck-hanging fan is particularly suitable for use in hot weather, especially in outdoor activities, fitness, travel and other occasions, and can effectively improve comfort.

[0187] Among them, the tied fan is a uniquely designed portable fan, which is usually used to fix in a specific position or tie to an object to provide circulating air flow or cooling effect. This fan is particularly suitable for certain special occasions, such as outdoor camping, cycling or use in a fixed working environment. The functions of the tied fan mainly include: ① Fixed use: The fan can be fixed to a chair, tent, shed, etc. by a rope, clip or other fixing device to achieve long-term use. ② Wind speed adjustment: This type of tied fan can provide multiple wind speeds, and users can choose different wind speed settings according to specific needs. ③ Multi-scene applicability: This type of tied fan can be suitable for outdoor, camping, sports, home use and other scenes. ④ Portable charging: This type of tied fan can adopt a USB charging design, which is easy to move and charge. The main features of the tied fan include: ① Flexibility: The fan itself can be adjusted in different positions and angles, and the wind direction can be adjusted freely. ② Lightweight design: The design of this type of tied fan is lightweight, easy to carry and install, and does not add too much weight burden. ③ Durability: This type of bundled fan is made of wear-resistant materials, suitable for outdoor environments, and can withstand certain wind and rain. ④ Quiet operation: The silent design adopted by this type of bundled fan ensures minimal noise during use and is suitable for use in a quiet environment. ⑤ Multiple styles: This type of bundled fan is equipped with bundled fans of different colors and designs so that consumers can choose according to their personal preferences. Therefore, the flexibility and portability of this type of bundled fan make it an ideal choice for many outdoor activities or fixed locations.

[0188] The technical effects of the above scheme are: on the one hand, the fan assembly and the noise reduction assembly are stored in the cavity through a portable shell, which greatly reduces the physical volume of the fan, makes the equipment easy to carry, suitable for use in various occasions, and improves the portability and operability of the active noise reduction fan; on the other hand, by distinguishing from the prior art, this scheme can dynamically analyze various static noise signals, including air intake noise, air outlet noise, fan blade noise and / or motor noise, through reasonable design of the function of the noise reduction component, so as to collect the dynamic comprehensive noise signal generated inside and outside the cavity in real time when the fan assembly is running, and send out a corresponding noise reduction signal with opposite phase, the same frequency and amplitude according to the noise signal, so as to perform destructive interference on the noise signal, realize active noise control of the fan assembly, and reduce the noise level when the fan is running.

[0189] Fig.12 2 is a block diagram of an electronic device 20 provided in an embodiment of the present application. For example, the electronic device 20 may be a handheld fan for wireless use, a neck-hanging fan for neck use, or a tied fan for tied use, etc. Fig.12The electronic device 20 includes a processor 21, which may be a processor set, which may include one or more processors, and the electronic device 20 includes a memory resource represented by a memory 22, wherein the memory 22 stores a computer program, such as an application. The computer program stored in the memory 22 may include one or more modules, each corresponding to a set of executable instructions. In addition, the processor 21 is configured to implement the active noise reduction program, the automatic signal processing program, and the signal feedback control program as described above when executing the computer program.

[0190] In some embodiments, the electronic device 20 is a handheld fan, and the computing system in the electronic device 20 can run one or more operating systems, including any operating system and any commercial server operating system. The electronic device 20 can also run any of various additional server applications and / or middle-tier applications, including HTTP (Hypertext Transfer Protocol) servers, FTP (File Transfer Protocol) servers, CGI (Common Gateway Interface) servers, super servers, database servers, etc. Exemplary database servers include, but are not limited to, database servers commercially available from (International Business Machines) and the like.

[0191] In some embodiments, the processor 21 generally controls the overall operation of the electronic device 20, such as operations associated with display, data processing, data communication, and recording operations. The processor 21 may include one or more processor components to execute a computer program to complete all or part of the steps of the above-mentioned control program. In addition, the processor component may include one or more modules to facilitate the interaction between the processor component and other components. For example, the processor component may include a multimedia module to facilitate the interaction between the user electronic device 20 and the processor 21 using the multimedia component to control.

[0192] In some embodiments, the processor component in the processor 21 may also be referred to as a CPU (Central Processing Unit). The processor component may be an electronic chip having the ability to process signals. The processor may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor component, etc. In addition, the processor component may be implemented by an integrated circuit chip.

[0193] In some embodiments, the memory 22 is configured to store various types of data to support operations on the electronic device 20. Examples of such data include instructions, collected data, messages, signals, etc. for any application program operating on the electronic device 20. The memory 22 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, optical disk, or graphene memory.

[0194] In some embodiments, the memory 22 can be a memory stick, a TF card, etc., which can store all the information in the electronic device 20, including the input raw data, computer programs, intermediate operation results and final operation results are all stored in the memory 22. In some embodiments, it stores and retrieves information according to the location specified by the processor 21. In some embodiments, only with the memory 22 can the electronic device 20 have a memory function to ensure normal operation. In some embodiments, the memory 22 of the electronic device 20 can be divided into main memory (internal memory) and auxiliary memory (external memory) according to its purpose, and there is also a classification method of dividing it into external memory and internal memory. External memory is usually a magnetic medium or an optical disk, etc., which can store information for a long time. Memory refers to the storage component on the motherboard, which is used to store the data and programs currently being executed, but is only used to temporarily store programs and data. If the power is turned off or the power is cut off, the data will be lost.

[0195] In some embodiments, the electronic device 20 may further include: a power supply component 23 configured to perform power management of the processor 21, a wired or wireless network interface 24 configured to connect the electronic device 20 to a network, and an input / output (I / O) interface 25. The electronic device 20 may operate based on an operating system stored in the memory 22, such as Windows Server, Mac OSX, Unix, Linux, FreeBSD or the like.

[0196] In some embodiments, power supply assembly 23 provides power to various components of electronic device 20. Power supply assembly 23 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 20.

[0197] In some embodiments, the wired or wireless network interface 24 is configured to facilitate wired or wireless communication between the electronic device 20 and other devices. The electronic device 20 can access a wireless network based on a communication standard, such as WiFi, an operator network (such as 2G, 3G, 4G or 5G), or a combination thereof.

[0198] In some embodiments, the wired or wireless network interface 24 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the wired or wireless network interface 24 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0199] In some embodiments, the input / output (I / O) interface 25 provides an interface between the processor 21 and a peripheral interface module, which may be a keyboard, a click wheel, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0200] Fig.13 is a block diagram of a computer-readable storage medium 30 provided in an embodiment of the present application. The computer-readable storage medium 30 stores computer program data 31, wherein the computer program data 31, when executed by the processor 21, implements the active noise reduction program, the automatic signal processing program, and the signal feedback control program as described above.

[0201] If the integrated units of the functional units in the various embodiments of the present application are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium 30. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer-readable storage medium 30 includes a number of instructions in a computer program data 31 to enable a computer device (which can be a personal computer, a system server, or a network device, etc.), an electronic device (such as a handheld electric fan, etc., or a desktop fan, a wearable fan, etc.) or a processor to execute all or part of the steps of the methods of various implementation methods of the present application.

[0202] Fig.14 4 is a block diagram of a computer program product 40 provided in an embodiment of the present application. The computer program product 40 includes program instructions 41, which can be executed by the processor 21 to implement the active noise reduction program, the automatic signal processing program and the signal feedback control program as described above.

[0203] Those skilled in the art should understand that the embodiments of the present application may provide an active noise reduction program, an automated signal processing program and a signal feedback control program, an active noise reduction fan 10, an electronic device 20, a computer-readable storage medium 30 or a computer program product 40. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product 40 implemented on one or more computer program instructions 41 (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0204] The present application is described with reference to the flowcharts and / or block diagrams of the active noise reduction program, the automated signal processing program and the signal feedback control program, the active noise reduction fan 10, the electronic device 20, the computer-readable storage medium 30 or the computer program product 40 according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by the computer program product 40. These computer program products 40 can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the program instructions 41 executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0205] These computer program products 40 may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the program instructions 41 stored in the computer program product 40 produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0206] These program instructions 41 may also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the program instructions 41 executed on the computer or other programmable device for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0207] It should be noted that the above-mentioned various programs, electronic devices, computer-readable storage media, computer program products, etc. may also include other implementation methods according to the description of the embodiments of the present application. The specific implementation methods can refer to the description of the relevant method embodiments, which will not be described one by one here.

[0208] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0209] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An active noise reduction fan, characterized in that: The active noise reduction fan comprises: The housing is a portable housing having a cavity inside and an air inlet and an air outlet connected to each other are respectively arranged at two ends of the housing; A fan assembly is disposed in the cavity and is used to rotate to generate wind pressure so as to draw air from the air inlet, pass through the cavity, and then blow it out from the air outlet; A noise reduction component is disposed in the cavity, and is used to collect noise signals inside and outside the cavity in real time when the fan component is running, and to send a noise reduction signal according to the noise signal; The noise signal is a dynamic integrated noise signal including air inlet noise, air outlet noise, fan blade noise and / or motor noise.

2. The active noise reduction fan according to claim 1, characterized in that: The noise reduction component comprises: A signal collector, disposed in the cavity, for collecting the noise signal in real time when the fan assembly is running; A signal processor, disposed in the cavity and electrically connected to the signal collector, for acquiring the noise signal and generating a signal generation instruction according to the noise signal; a signal generator, disposed in the cavity and electrically connected to the signal processor, for acquiring the signal generation instruction and issuing the noise reduction signal according to the signal generation instruction; Wherein, within a preset error tolerance range, the noise reduction signal and the noise signal have opposite phases and the same frequency and amplitude, so as to perform destructive interference on the noise signal and realize active noise control of the fan assembly.

3. The active noise reduction fan according to claim 2, characterized in that: The signal collector includes at least one sound sensor, which is arranged at at least one corresponding target point in the cavity and is used to collect static noise signals near each target point in real time; The target points include at least the edge of the air inlet, the edge of the air outlet, the vicinity of the motor, the vicinity of the fan blades, and the vicinity of the center of the air duct. The air intake noise includes the static air intake noise generated by the active noise reduction fan when it is in fixed use and the dynamic air intake noise generated when the user shakes it; the air outlet noise includes the static air outlet noise generated by the active noise reduction fan when it is in fixed use and the dynamic air outlet noise generated when the user shakes it; the fan blade noise includes the static fan blade noise generated by the active noise reduction fan when it is in fixed use and the dynamic fan blade noise generated when the user shakes it; the motor noise includes the static motor noise generated by the active noise reduction fan when it is in fixed use and the dynamic fan blade noise generated when the user shakes it.

4. The active noise reduction fan according to claim 3, characterized in that: The signal processor includes a filter, a signal synthesizer, a signal amplifier, an analog-to-digital converter and a computer chip which are electrically connected in sequence; The filter is used to perform real-time filtering on the noise signals collected by each sound sensor to obtain a filtered noise signal; The signal synthesizer is used to perform signal fusion processing on each of the filtered noise signals to obtain a dynamically composed comprehensive noise signal; The signal amplifier is used to perform signal amplification processing on the integrated noise signal to obtain an integrated amplified signal; The analog-to-digital converter is used to perform analog-to-digital conversion processing on the integrated amplified signal to obtain a corresponding pulse code signal; The computer chip is used to perform phase inversion processing on the pulse code signal to obtain inverted signal data, and generate the signal generation instruction based on the inverted signal data.

5. The active noise reduction fan according to claim 4, characterized in that: The signal generator includes at least one sound player and a power amplifier arranged corresponding to each of the target points; Wherein, the power amplifier is used to amplify the inverted signal data carried by the signal generation instruction to obtain a power amplified signal; The sound player is used to send out a noise reduction signal with a phase opposite to that of the comprehensive noise signal and the same frequency and amplitude according to the power amplified signal.

6. The active noise reduction fan according to claim 4, characterized in that: The signal processor further comprises an amplitude comparator, the input end of the amplitude comparator is electrically connected to the analog-to-digital converter, and the output end of the amplitude comparator is electrically connected to the computer chip; The amplitude comparator is used to obtain the pulse coded signal and extract a corresponding noise amplitude sequence from the pulse coded signal, so as to compare the noise amplitude sequence with a preset amplitude threshold to obtain a first comparison result; The computer chip is also used to obtain the first comparison result, and when the first comparison result is that the noise amplitude sequence is greater than the amplitude threshold, perform phase inversion processing on the pulse coded signal to obtain the inverted signal data, or, when the first comparison result is that the noise amplitude sequence is less than or equal to the amplitude threshold, end the noise reduction program.

7. The active noise reduction fan according to claim 4, characterized in that: The signal processor further comprises a decibel comparator, the input end of the decibel comparator is electrically connected to the signal collector, and the output end of the decibel comparator is electrically connected to the computer chip; The decibel comparator is used to obtain the residual noise signal collected by the signal collector in real time after the signal generator sends the noise reduction signal, and extract the corresponding noise decibel value from the residual noise signal, so as to compare the noise decibel value with a preset decibel threshold to obtain a second comparison result; The computer chip is also used to obtain the second comparison result, and when the second comparison result is that the noise decibel value is greater than the decibel threshold, reduce the speed of the motor of the fan assembly, or, when the second comparison result is that the noise decibel value is less than or equal to the decibel threshold, end the noise reduction program.

8. The active noise reduction fan according to claim 4, characterized in that: The signal processor further comprises: The error acquisition component is disposed in the cavity and electrically connected to the computer chip, and is used to calculate the error between the noise signal and the noise reduction signal to obtain error signal data, and feed the error signal data back to the computer chip so as to calibrate the noise reduction signal through the computer chip.

9. The active noise reduction fan according to claim 1, characterized in that: The active noise reduction fan also includes a memory, which is arranged in the cavity and is used to store a preset speed and noise comparison table and a noise reduction signal database; wherein the speed and noise comparison table is used to characterize the mapping relationship between the speed of the motor in the fan assembly and the corresponding noise signal generated by the fan assembly; the noise reduction signal database is used to store noise reduction signals with opposite phases and the same frequency and amplitude as multiple preset noise signals; The noise reduction component is also used to obtain the real-time speed of the motor when the fan component is running, and determine the target noise signal matching the real-time speed according to the speed and noise comparison table, and determine the target noise reduction signal matching the target noise signal from the noise reduction signal database, so as to perform active noise control on the fan component based on the target noise reduction signal.

10. The active noise reduction fan according to any one of claims 1 to 9, characterized in that: The active noise reduction fan at least includes a handheld fan for wireless use by hand, a neck-hanging fan for neck-hanging use, or a tied fan for tied use.

11. The active noise reduction fan according to claim 10, characterized in that: The active noise reduction fan is applied to a high-speed motor whose operating speed exceeds a preset speed; wherein the high-speed motor comprises a high-speed three-phase motor.

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