Portable active noise reduction fan

Abstract

The embodiment of the utility model relates to the technical field of fans, in particular to a portable active noise reduction fan, which comprises a shell, an air inlet, an air outlet, an air inlet, a noise reduction fan and a noise reduction fan, the shell is a portable shell, a cavity is arranged in the shell, and the two ends of the shell are respectively provided with the air inlet and the air outlet which are communicated with each other; 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. According to the utility model, the functions of the noise reduction component are reasonably designed, and the noise reduction signal is utilized to carry out active noise control on the noise signal, so that the noise level during the operation of the fan is reduced.

Description

TECHNICAL FIELD

[0001] The utility model discloses an embodiment relates to fan technical field, in particular to a portable active noise reduction fan. BACKGROUND

[0002] In recent years, people are more and more pursuing more convenient life, in order to meet the needs of outdoor activities or other life scene needs to use the fan, there are all kinds of portable fan products on the market, such as handheld fan, hanging neck type fan etc.

[0003] In the development process of the current portable fan, due to the mechanical friction of the fan itself and the running of air flow, noise will be generated, and the higher the fan speed, the larger the air volume, the greater the noise caused, thereby causing the user's experience to be poor. At present, the passive method is mostly used for noise control, such as covering the sound insulation cotton in the inner wall of the machine, optimizing the heat dissipation channel, etc., but the effect of these methods on noise elimination is limited, so how to effectively eliminate the noise generated by the fan in the running process is a technical problem to be solved by the technical personnel in the field. INVENTION CONTENTS

[0004] Therefore, it is necessary to provide a portable active noise reduction fan capable of effectively reducing fan operation noise in view of the above technical problems.

[0005] The embodiment of the application provides a portable active noise reduction fan, which comprises:

[0006] A shell, which is a portable shell, has a cavity inside the shell, and an air inlet and an air outlet are arranged at two ends of the shell and are in communication with each other;

[0007] A fan assembly arranged in the cavity is used to rotate to generate wind pressure, so that air is sucked from the air inlet, passes through the cavity and is blown out from the air outlet;

[0008] A noise reduction assembly arranged in the cavity is used to collect noise signals inside and outside the cavity in real time when the fan assembly is running, and emit noise reduction signals according to the noise signals.

[0009] The noise signal is a dynamic comprehensive noise signal including inlet noise, outlet noise, fan blade noise and / or motor noise.

[0010] In one embodiment, the noise reduction assembly comprises:

[0011] A signal collector arranged in the cavity is used to collect the noise signal in real time when the fan assembly is running.

[0012] a signal processor arranged in the cavity and electrically connected with the signal collector, configured to acquire the noise signal and generate a signal generation instruction according to the noise signal;

[0013] a signal generator arranged in the cavity and electrically connected with the signal processor, configured to acquire the signal generation instruction and emit the noise reduction signal according to the signal generation instruction;

[0014] wherein, within a preset error allowable range, the noise reduction signal is opposite in phase, identical in frequency and amplitude to the noise signal, so as to perform destructive interference on the noise signal and achieve active noise control of the fan assembly.

[0015] In one of the embodiments, the signal collector comprises at least one sound sensor arranged at corresponding at least one target point in the cavity, configured to acquire static noise signals near each target point in real time;

[0016] wherein, the target points at least include edge positions of the air inlet, edge positions of the air outlet, positions near the motor, positions near the fan blade and a position near the air duct center;

[0017] The air inlet noise includes static air inlet noise generated by the portable active noise reduction fan when fixedly used and dynamic air inlet noise generated by the portable active noise reduction fan when used by a user shaking; the air outlet noise includes static air outlet noise generated by the portable active noise reduction fan when fixedly used and dynamic air outlet noise generated by the portable active noise reduction fan when used by a user shaking; the fan blade noise includes static fan blade noise generated by the portable active noise reduction fan when fixedly used and dynamic fan blade noise generated by the portable active noise reduction fan when used by a user shaking; and the motor noise includes static motor noise generated by the portable active noise reduction fan when fixedly used and dynamic fan blade noise generated by the portable active noise reduction fan when used by a user shaking.

[0018] In one of the embodiments, the signal processor comprises a filter, a signal synthesizer, a signal amplifier, an analog-to-digital converter and a computer chip connected in sequence;

[0019] wherein, the filter is configured to perform real-time filtering processing on the noise signals collected by each sound sensor to obtain filtered noise signals;

[0020] the signal synthesizer is configured to perform signal fusion processing on each filtered noise signal to obtain a comprehensive noise signal;

[0021] the signal amplifier is configured to perform signal amplification processing on the comprehensive noise signal to obtain a dynamically composed comprehensive amplified signal;

[0022] The analog-to-digital converter is configured to perform analog-to-digital conversion on the integrated amplified signal to obtain a corresponding pulse coded signal.

[0023] The computer chip is configured to perform phase inversion processing on the pulse coded signal to obtain anti-phase signal data, and generate the signal generation instruction based on the anti-phase signal data.

[0024] In one of the embodiments, the signal generator comprises at least one sound player and a power amplifier arranged at each of the target points;

[0025] The power amplifier is configured to amplify the anti-phase signal data carried by the signal generation instruction to obtain a power amplified signal.

[0026] The sound player is configured to emit a noise reduction signal having the same frequency and amplitude as the integrated noise signal but having an opposite phase according to the power amplified signal.

[0027] In one of the embodiments, the signal processor further comprises an amplitude comparator, an input end of the amplitude comparator being electrically connected to the analog-to-digital converter, and an output end of the amplitude comparator being electrically connected to the computer chip.

[0028] The amplitude comparator is configured to obtain the pulse coded signal, extract a corresponding noise amplitude sequence from the pulse coded signal, and compare the noise amplitude sequence with a preset amplitude threshold to obtain a first comparison result.

[0029] The computer chip is further configured to obtain the first comparison result, perform phase inversion processing on the pulse coded signal to obtain the anti-phase signal data when the first comparison result indicates that the noise amplitude sequence is greater than the amplitude threshold, or end the noise reduction procedure when the first comparison result indicates that the noise amplitude sequence is less than or equal to the amplitude threshold.

[0030] In one of the embodiments, the signal processor further comprises a decibel comparator, an input end of the decibel comparator being electrically connected to the signal collector, and an output end of the decibel comparator being electrically connected to the computer chip.

[0031] The decibel comparator is configured to obtain a residual noise signal from the signal collector after the signal generator emits the noise reduction signal, extract a corresponding noise decibel value from the residual noise signal, and compare the noise decibel value with a preset decibel threshold to obtain a second comparison result.

[0032] The computer chip is further configured to acquire the second comparison result, and when the second comparison result is that the noise decibel value is greater than the decibel threshold, the motor of the fan assembly is slowed down, 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.

[0033] In one embodiment, the signal processor further comprises:

[0034] The error acquisition component is arranged in the cavity and electrically connected to the computer chip, configured to calculate the error between the noise signal and the noise reduction signal to obtain error signal data, and feed back the error signal data to the computer chip to calibrate the noise reduction signal by the computer chip.

[0035] In one embodiment, the portable active noise reduction fan further comprises a memory arranged in the cavity, configured to store a preset speed-noise correlation table and a noise reduction signal database; wherein the speed-noise correlation table is used to represent the mapping relationship between the speed of the motor in the fan assembly and the corresponding noise signal generated by the fan assembly; and the noise reduction signal database is used to store noise reduction signals opposite in phase, same in frequency and amplitude to a plurality of preset noise signals.

[0036] The noise reduction component is further configured to acquire the real-time speed of the motor when the fan assembly is running, and determine a target noise signal matching the real-time speed according to the speed-noise correlation table, determine a target noise reduction signal matching the target noise signal from the noise reduction signal database, and perform active noise control on the fan assembly based on the target noise reduction signal.

[0037] In one embodiment, the portable active noise reduction fan at least includes a handheld fan for handheld wireless use, a neck-hanging fan for neck-hanging use, or a binding fan for binding use.

[0038] In one embodiment, the portable active noise reduction fan is applied to a high-speed motor with a running speed exceeding a preset speed; wherein the high-speed motor includes a high-speed three-phase motor.

[0039] The portable active noise reduction fan has the advantages that: on one hand, the fan assembly and the noise reduction assembly are accommodated in the cavity through the portable shell, so that the physical volume of the fan is greatly reduced, the device is easy to carry, is suitable for use in various occasions, and the portability and operability of the active noise reduction fan are improved; on the other hand, the noise reduction assembly is reasonably designed, various noise signals, including the air inlet noise, the air outlet noise, the fan blade noise and / or the motor noise, are dynamically analyzed, so that the dynamic comprehensive noise signals generated inside and outside the cavity during the operation of the fan assembly are collected in real time, the corresponding noise reduction signals are emitted according to the dynamic comprehensive noise signals, the active noise control of the fan assembly is realized, and the noise level during the operation of the fan is reduced.

[0040] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without creative labor.

[0042] Figure 1 is a front side perspective view of a portable active noise reduction fan according to an exemplary embodiment;

[0043] Figure 2 is a back side perspective view of a portable active noise reduction fan according to an exemplary embodiment;

[0044] Figure 3 is a perspective exploded view of a portable active noise reduction fan according to an exemplary embodiment;

[0045] Figure 4 is a side sectional view of a portable active noise reduction fan according to an exemplary embodiment;

[0046] Figure 5 is a module schematic view of a signal processor according to an exemplary embodiment;

[0047] Figure 6 is a module schematic view of a signal generator according to an exemplary embodiment;

[0048] Figure 7 is a module schematic view of an automated signal processing system according to an exemplary embodiment;

[0049] Figure 8 is a logic diagram of an automated signal processing procedure according to an exemplary embodiment;

[0050] Figure 9 is a logic diagram of another automated signal processing procedure according to an exemplary embodiment;

[0051] Figure 10 is a block diagram of a signal feedback control system according to an exemplary embodiment.

[0052] Figure 11 is a block diagram of a memory according to an exemplary embodiment;

[0053] Figure 12 is a block diagram of an electronic device for active noise reduction according to an exemplary embodiment.

[0054] Figure 13 is a block diagram of a computer readable storage medium for active noise reduction according to an exemplary embodiment.

[0055] Figure 14 is a block diagram of a computer program product for active noise reduction according to an exemplary embodiment.

[0056] Wherein, the figure reference signs: portable active noise reduction fan; 100, shell; 101, cavity; 102, air inlet; 103, air outlet; 104, air inlet cover; 105, air outlet cover; 110, hand shell; 111, battery module; 112, control assembly; 120, air shell; 200, fan assembly; 210, motor; 211, stator assembly; 212, rotor assembly; 220, fan blade; 221, hub; 222, blade; 300, noise reduction assembly; 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; 324, analog-to-digital converter; 325, computer chip; 326, amplitude comparator; 327, decibel comparator; 328, error collection piece; 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 control table; 420, noise reduction signal database; 20, electronic device; 21, processor; 22, memory; 23, power supply assembly; 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

[0057] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0058] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in combination with the embodiments can be contained in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiments, nor is it necessarily independent or alternative embodiments to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] The term "and / or" in the embodiments of the present application means any and all possible combinations of one or more of the associated listed items. It should also be noted that the term "comprising" as used in this specification means the presence of stated features, integers, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, elements, and / or components, and / or groups thereof. For example, a product or article of manufacture that comprises a list of elements is not limited to only those elements but can include other elements not expressly listed or inherent to such product or article of manufacture.

[0060] In the following, first the definitions of the technical terms commonly used in the art are described:

[0061] 1. Active noise reduction

[0062] By releasing an acoustic wave signal with the same or similar amplitude and opposite phase as the noise source, the noise level of the noise source is reduced or eliminated, thereby achieving the effect of noise reduction.

[0063] 2. Power amplifier

[0064] Power amplifier, abbreviated as "power amplifier", refers to an amplifier that can produce maximum power output to drive a certain load (such as a loudspeaker) under given distortion rate conditions. The power amplifier plays a pivotal role in "organizing and coordinating" the entire audio system, and to some extent, dominates whether the entire system can provide good sound quality output.

[0065] 3. Loudspeaker

[0066] Loudspeaker, also known as "loudspeaker", is a very commonly used electro-acoustic transducer. It can be found in sound-emitting electronic and electrical equipment.

[0067] To explain the technical content, technical steps, purposes and effects of the present application in detail, the following embodiments are combined with the drawings for detailed description.

[0068] With the development of science and technology and the increasing demand for comfortable living environment, the application of noise reduction technology in electronic equipment is becoming more and more widespread. Traditional fan equipment will produce significant noise when running, which not only affects the comfort of users, but also may cause interference to sensitive places (such as offices, hospitals, etc.). Therefore, it is particularly important to develop a fan equipment that can effectively reduce the running noise.

[0069] The utility model discloses a portable active noise reduction fan, can produce cool wind at the same time, effectively reduce the noise of running. The fan through active noise control technology, real-time acquisition noise signal and produce with it opposite noise reduction signal, to realize the destructive interference of noise, thereby improve the user's use experience. Specific as follows:

[0070] The utility model provides a kind of portable active noise reduction fan 10, please refer to Figures 1 to 4 , the portable active noise reduction fan 10 includes shell 100, fan assembly 200 and noise reduction component 300. Among them, shell 100 is a portable shell, with cavity 101 in shell interior, and the two ends of shell 100 are provided with mutually communicating air inlet 102 and air outlet 103 respectively;Fan assembly 200 is set in cavity 101, for rotating to generate wind pressure, to suck air from air inlet 102 into via cavity 101, and blow from air outlet 103;Noise reduction component 300 is set in cavity 101, for real-time acquisition of noise signal inside and outside cavity 101 when fan assembly 200 operates, and according to noise signal, noise reduction signal is sent.

[0071] For shell 100, please continue to refer to Figure 1 And Figure 2 , the shell 100 is a humanized portable shell, and is carefully designed in structure, so that it is small in size, convenient to carry. Shell 100 is internally provided with cavity 101 for storing fan assembly 200 and noise reduction component 300, which constitutes the basic framework of noise reduction fan 10.

[0072] In some embodiments, as Figure 1 Indicated, the appearance style of the noise reduction fan 10 is mainly presented by shell 100, in order to facilitate user to carry, the shell 100 includes hand shell 110 for user to hold, and wind shell 120 for connecting air inlet 102, cavity 101 and air outlet 103.

[0073] In some embodiments, as Figure 3 And Figure 4 Indicated, wind shell 120 is hollow cylinder structure, and its inside has cavity 101, and is provided with air inlet 102 communicated with outside at one end of cavity 101, and is provided with air outlet 103 communicated with outside at the other end, wherein, air inlet 102 is provided with air inlet cover 104 on one side, and air outlet 103 is provided with air outlet cover 105 on one side, so that air can be sucked into cavity 101 from air inlet 102 through air inlet cover 104, and then discharged from air outlet cover 105 through air outlet 103, to improve the overall air outlet efficiency of the equipment. At the same time, the mini design of cavity 101 ensures the flexibility of the equipment when in use.

[0074] In some embodiments, the air inlet 102 and the air outlet 103 are respectively arranged at two ends of the air casing 120, the air inlet 102 and the air outlet 103 are circular in cross-sectional shape, and the air inlet 102, the air outlet 103 and the axis of the cavity 101 are collinear.

[0075] In the embodiments of the present application, the cross section of the cavity 101 and the air inlet 102 and the air outlet 103 is circular to ensure uniform suction and consistent overall size, without using angles, and to maintain uniform wall thickness of the air casing 120, thereby ensuring the overall strength of the air casing 120. In some embodiments, the cross section of the cavity 101 can be elliptical or polygonal, the cross section of the air inlet 102 and the air outlet 103 can be waist-shaped or rectangular, and the positions of the air inlet 102 and the air outlet 103 can be offset from the axis of the cavity 101, which are not specifically limited in the present application.

[0076] The axis of the air casing 120 is the central axis direction of the cylindrical shape, and the airflow direction of the fan assembly 200 of the noise reduction fan 10 during operation is parallel to the axis. In other embodiments, when the air casing 120 is not cylindrical, the axis of the air casing 120 is the extension direction of the main structure, and the airflow direction is parallel to the axis. In some embodiments, the air casing 120 is wrapped with a buffer sleeve (not numbered, the same below), and in other embodiments, the buffer sleeve can also be omitted.

[0077] In some embodiments, the battery module 111 and the control assembly 112 are arranged in the hand casing 110, and the fan assembly 200 and the noise reduction assembly 300 are arranged in the air casing 120. The battery module 111 (such as a battery) in the noise reduction fan 10 for supplying power to each component in the hand casing 110 is logically connected to the noise reduction assembly 300 through a power management system, so as to realize the functions of charging management, discharging management and power consumption management through the power management system.

[0078] As shown in FIGS. Figure 1 and Figure 2 In one embodiment, the length of the hand casing 110 is 52-62 mm, the width of the hand casing 110 is 25.5-35.5 mm, and the height of the hand casing 110 is 96.6-106.6 mm, and the overall volume of the hand casing 110 is relatively small, so that the hand casing 110 is convenient for the user to hold.

[0079] For the fan assembly 200, the fan assembly 200 includes a motor 210 and a fan blade 220. The control assembly 112 controls the battery module 111 to supply power to the motor 210, and the motor 210 drives the fan blade 220 to rotate to generate wind pressure, so as to suck air from the air inlet 102, pass through the cavity 101, and blow out from the air outlet 103.

[0080] In some embodiments, the fan blade 220 is accommodated in the cavity 101 and arranged at one side close to the air inlet 102. The motor 210 includes a stator assembly 211 and a rotor assembly 212, and the outer diameter of the motor 210 is smaller than the inner diameter of the cavity 101, and the motor 210 is mounted on the inner side of the cavity 101.

[0081] In some embodiments, the fan blade 220 includes a hub 221 and a plurality of blades 222 arranged around the hub 221. The outer diameter of the motor 210 is smaller than the maximum inner diameter of the hub 221, so a part of the motor 210 can also be accommodated in the inner side of the hub 221. In this embodiment, the hub 221 increases radially from back to front, the air casing 120 is radially constant from back to front, the maximum diameter of the hub 221 is not greater than the diameter of the air casing 120, and the wind generated by the rotation of the fan blade 220 can smoothly flow to the outside of the air casing 120, reducing wind resistance and wind loss. In other embodiments, the maximum diameter of the hub 221 is less than 2mm different from the diameter of the air casing 120, which can also achieve the effect of reducing wind resistance and wind loss.

[0082] As shown in Figure 3 and Figure 4 , in one embodiment, the rotor assembly 212 includes a shaft, a bearing, a magnetic ring and a yoke. The bearing is arranged in the bearing seat, and one end of the shaft is fixed in the bearing seat through the bearing. The magnetic ring is fixed on the radial inner side of the yoke, the yoke is fixedly connected to the 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 shaft is fixedly connected to the fan blade 220. That is, the magnetic ring is arranged on the radial outer side of the stator assembly 211, and the motor 210 is an external rotor motor. Moreover, the magnetic ring is fixed on the radial inner side of the yoke, and the yoke is fixedly connected to the shaft, so that when the stator assembly 211 drives the magnetic ring to rotate, the magnetic ring drives the yoke to rotate, and the yoke drives the shaft to rotate. Therefore, the magnetic ring or the yoke does not need to be connected to the motor 210, and the other end of the shaft is fixedly connected to the motor 210, and the shaft drives the motor 210 to rotate.

[0083] As shown in Figure 3 and Figure 4 , in one embodiment, the bearing includes a first bearing located in front, a second bearing located in back, and a buffer arranged between the first bearing and the second bearing. The front end of the inner side wall of the cavity 101 directly abuts against the second bearing, or an elastic member is arranged between the front end of the inner side wall and the second bearing. The buffer can be a single spring, or can be composed of a spring and a rubber sleeve, or can be other elastic materials. The elastic member can be a spring, or other elastic materials.

[0084] In some embodiments, the portable active noise reduction fan 10 is applied to a high-speed motor running at a speed exceeding a preset speed; wherein the high-speed motor includes a high-speed three-phase motor.

[0085] Specifically, the portable active noise reduction fan 10 can be used to run a high-speed motor with a rotation speed exceeding a preset rotation speed (for example, 12000 rpm or more), and the high-speed motor is prone to generate high noise in actual operation, so that the portable 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 rotation speed to ensure the wind power of the portable active noise reduction fan 10. In this case, in order to ensure good overall damping effect, a buffer can be arranged on the inner wall of the shell 100, which can timely absorb and reduce the vibration caused by the high-speed three-phase motor, so that the portable active noise reduction fan 10 can continuously and stably rotate at high speed.

[0086] As shown in Figure 3 , Figure 4 In one embodiment, the motor 210 is a three-phase high-speed motor, and the motor 210 further includes a driving board. The inside of the wind shell 120 is provided with a fixed hole, and the driving board is provided with a fixed port. The fixing member passes through the fixed port and is fixed to the fixed hole, so as to fix the driving board to the wind shell 120.

[0087] For the noise reduction assembly 300, the noise reduction assembly 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 with the signal collector 310, and is used to obtain the 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 with the signal processor 320, and is used to obtain the signal generation instructions and emit noise reduction signals according to the signal generation instructions.

[0088] In some embodiments, the noise signal collected by the signal collector 310 is a dynamic comprehensive noise signal including the inlet noise, the outlet noise, the fan blade noise and / or the motor noise. The inlet noise and the outlet noise are respectively the noise signals generated by the shell 100 when the air is inhaled and exhaled. The fan blade noise and the motor noise are respectively the noise signals generated by the fan blade 220 and the motor 210 of the fan assembly 200 when they are running.

[0089] Specifically, during the operation of the fan assembly 200, the air inlet 102 and the air inlet cover 104 of the housing 100 will suck in a large amount of air, thereby causing the air inlet cover 104 and the air inlet outer contour to generate a corresponding size of air inlet noise. 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 exhaust a large amount of air, thereby causing the air outlet cover 105 and the air outlet outer contour to also generate a corresponding size of air outlet noise. Or during the operation of the fan assembly 200, the rotation process of the fan blade 220 will move with the air, thereby generating pressure pulsation and generating a corresponding size of fan blade noise. Or during the operation of the fan assembly 200, when the rotor of the motor 210 cuts the magnetic force line, the friction between the rotor and the stator will generate a corresponding size of motor noise. Therefore, the above-mentioned four main static noise signals will dynamically form a comprehensive noise signal and be transmitted to the user's hearing system during the user's use of the noise reduction fan 10 (for example, the user holding the noise reduction fan 10 and walking, running, or remaining stationary). In some embodiments, the signal collector 310 follows the user's use scenario, collects the comprehensive noise signal dynamically composed of the above-mentioned air inlet 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.

[0090] In some embodiments, the air inlet noise includes static air inlet noise generated by the portable active noise reduction fan 10 when fixedly used and dynamic air inlet noise generated when the user shakes it; the air outlet noise includes static air outlet noise generated by the portable active noise reduction fan 10 when fixedly used and dynamic air outlet noise generated when the user shakes it; the fan blade noise includes static fan blade noise generated by the portable active noise reduction fan 10 when fixedly used and dynamic fan blade noise generated when the user shakes it; and the motor noise includes static motor noise generated by the portable active noise reduction fan 10 when fixedly used and dynamic fan blade noise generated when the user shakes it.

[0091] Specifically, in the actual application scenario of the portable active noise reduction fan 10, it can have multiple use states, and the corresponding dynamic comprehensive noise signal generated in each use state is different. For example, when the user places it on a table as a desktop fan, the portable active noise reduction fan 10 is in a static state, and the corresponding dynamic comprehensive noise signal generated is static noise, or when the user holds it and moves it at an irregular speed and direction, the portable active noise reduction fan 10 is in an irregular running state, and the corresponding dynamic comprehensive noise signal generated is dynamic noise.

[0092] In some embodiments, after the noise signal is collected by the signal collector 310, the noise signal is transmitted to the signal processor 320, which can extract the amplitude, frequency and phase of the noise signal, and generate a signal generation instruction according to the collected noise signal, which can instruct the signal generator 330 to emit a noise reduction signal to eliminate the noise signal.

[0093] In an embodiment, within a preset error tolerance range, the noise reduction signal is opposite in phase, identical in frequency and amplitude to the noise signal, for destructive interference of the noise signal, to achieve active noise control of the fan assembly 200.

[0094] Specifically, sound is composed of a certain frequency spectrum, and the frequency spectrum of the noise reduction signal is exactly the same as the noise signal to be eliminated, but the phase is just opposite, i.e. 180° difference, which can completely eliminate the noise signal. In this way, after the interference and interference of the noise reduction signal, the new sound wave generated can be weak enough to be inaudible to the human ear, thereby reducing the impact of the motor noise signal on humans.

[0095] It should be understood that due to the influence of external factors such as background noise, temperature change, etc. during signal collection or environmental noise measurement, the signal collection may not be accurate, or different noise reduction algorithms have their applicable range and limitations, and some algorithms may not be able to effectively process noise in all frequency ranges, resulting in inaccurate effects of noise reduction audio generation, or the structure 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 effect of signal collection, ultimately resulting in the phase of the generated noise reduction signal not being exactly 180° different from the noise signal, and / or the frequency and amplitude not being 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 phase of the two is opposite, the frequency and amplitude are the same.

[0096] In some embodiments, the signal processor 320 can simultaneously receive noise signals obtained by multiple signal collectors 310, and can output multiple signal generation instructions to the signal generator 330, that is, one noise reduction fan 10 can include multiple sets of noise reduction assemblies 300.

[0097] Among them, the way each unit in the noise reduction assembly 300 receives and transmits signals can be wireless or wired, that is, the noise reduction assembly 300 can simultaneously perform active noise control on multiple target areas in the noise reduction fan 10.

[0098] 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 the noise signal and control the signal generator 330 to play the noise reduction signal.

[0099] In this way, the signal processor 320 can control the plurality of signal collectors 310 to collect the noise signal, and after the signal processor 320 performs feature extraction and analysis processing on the collected noise signal and generates the signal generation instruction, the signal processor 320 can control the plurality of signal generators 330 to respectively play the corresponding noise reduction signal, so as to offset the noise signal.

[0100] In another possible implementation, the noise reduction assembly 300 provided by the embodiment of the present application can further include a wireless communication assembly, and the signal processor 320, the signal collector 310, and the signal generator 330 are all electrically connected to the wireless communication assembly.

[0101] In this way, the signal processor 320 can send the signal generation instruction to the plurality of signal collectors 310 and the plurality of signal generators 330 in a wireless communication manner, so that the noise reduction assembly 300 is convenient to use.

[0102] In a specific implementation, the wireless communication assembly includes at least one of a Bluetooth module, a WiFi module, and a 5G module.

[0103] In order to facilitate signal transmission, the wireless communication assembly adopts a wireless communication manner, which can include one or more of a Bluetooth module, a WiFi module, and a 5G module. The WiFi module is arranged in the wireless communication assembly to directly connect the signal processor 320, the signal collector 310, and the signal generator 330 to the Internet by using WiFi, so that the signal processor 320, the signal collector 310, and the signal generator 330 communicate with each other. The Bluetooth module is a short-range wireless communication technology that replaces data cables. The Bluetooth module supports point-to-point and point-to-multipoint communication, and wirelessly connects the signal processor 320, the signal collector 310, and the signal generator 330 into a micro network, so as to realize fast and convenient communication among these modules. The 5G is a new generation of broadband mobile communication technology with high speed, low latency, and large connection characteristics. The 5G module arranged in the wireless communication assembly can realize interconnection of the signal processor 320, the signal collector 310, and the signal generator 330, so as to realize fast communication between the signal processor 320 and the signal generator 330. In a specific implementation, the arrangement can be made according to actual use, and the embodiment does not limit this.

[0104] In a specific implementation scenario, the working principle of the noise reduction fan 10 can be as follows: when the noise reduction fan 10 is started, the main controller initializes all elements; then the signal processor 320 reads the noise signals sent by the at least one signal collector 310, and continuously detects if the noise signals sent by the signal collector 310 are not detected. If the noise signal is detected, the signal processor 320 first uses the FFT transform to analyze the frequency, amplitude and phase of each noise signal, and then generates a signal generation instruction according to the analyzed frequency, amplitude and phase of the noise signal, and sends the signal generation instruction to the corresponding matched signal generator 330 to instruct the signal generator 330 to emit a noise reduction signal with the same frequency and amplitude as the noise signal but with opposite phase to eliminate the noise signal.

[0105] The technical effect of the above scheme is that, on the one hand, the fan assembly and the noise reduction assembly are accommodated in the cavity by the portable shell, which greatly reduces the physical volume of the fan, makes the device easy to carry, and is suitable for use in various occasions, thereby improving the portability and operability of the active noise reduction fan; on the other hand, by means different from the prior art, the scheme can dynamically analyze various noise signals, including inlet noise, outlet noise, fan blade noise and / or motor noise, thereby collecting dynamic comprehensive noise signals generated inside and outside the cavity in real time when the fan assembly is running, and emitting corresponding noise reduction signals according to the dynamic comprehensive noise signals, thereby realizing active noise control of the fan assembly to reduce the noise level when the fan is running.

[0106] Those skilled in the art can understand that, Figures 1 to 4 The portable active noise reduction fan shown in the above-mentioned embodiments is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the noise reduction fan to which the scheme of the present application is applied. The specific noise reduction assembly can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0107] In an embodiment, the signal collector 310 includes at least one sound sensor 311; wherein the at least one sound sensor 311 is arranged at the corresponding at least one target point in the cavity 101 to collect noise signals near each target point in real time;

[0108] The sound sensors 311, distributed at various target points within 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 rotate and interact with the air, generating pressure pulsations and thus producing noise of a corresponding magnitude. Alternatively, the torque generated by the fan blades 220 is transmitted to the motor 210 through the transmission mechanism, also generating noise of a corresponding magnitude, mainly including bearing noise, gear noise, and motor noise. Furthermore, when the rotor of the motor 210 cuts magnetic lines of force, friction between the rotor and stator generates noise of a corresponding magnitude. Or, under strong winds, a short circuit in the motor 210 can also produce abnormal noise, as can aerodynamic noise generated by high-speed airflow, unstable airflow, and the interaction between the airflow and the blades 222. Therefore, the sound sensors 311 at various locations can be used to collect the aforementioned noise signals.

[0109] In some embodiments, the target location includes at least the edge of the air inlet 102, the edge of the air outlet 103, the vicinity of the motor 210, the vicinity of the fan blade 220, and the vicinity of the air duct center 106.

[0110] For details, please continue as follows Figure 3 As shown, since the noise of the fan assembly 200 is mainly generated when the fan blades 220 rotate, in one possible implementation, the multiple sound sensors 311 include a first microphone 311a and a second microphone 311b. The first microphone 311a is disposed on the blades 222 of the fan blades 220 and is configured to collect the noise signal of the blades 222 of the fan blades 220. The second microphone 311b is disposed on the hub 221 of the fan blades 220 and is configured to collect the noise signal of the hub 221.

[0111] In this way, the first microphone 311a can collect the noise signal of the blades 222 of the fan blade 220 and transmit the noise signal to the signal processor 320 to extract the amplitude, frequency, and phase characteristics of the noise signal. The signal generator 330 then generates a noise reduction signal to cancel the noise signal, thereby partially or completely eliminating the noise signal generated by the blades 222 of the fan blade 220 during rotation. 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 amplitude, frequency, and phase characteristics of the noise signal. Based on these characteristics, the signal generator 330 generates a noise reduction signal to cancel the noise signal, thereby partially or completely eliminating the noise signal generated by the hub 221 of the fan blade 220 during rotation.

[0112] Please continue as follows Figure 3As shown, in addition to the hub 221 and blades 222 generating significant noise during rotation, the rotor assembly 212 of the motor 210 also generates noise signals when cutting magnetic lines of force, as well as the friction between the rotor assembly 212 and the stator assembly 211. In some embodiments, the plurality of sound sensors 311 further include a third microphone 311c, which is disposed on the inner wall near the motor 210 within the cavity 101 and configured to collect noise signals from the motor 210.

[0113] Thus, 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 amplitude, frequency and phase characteristics of the noise signal, and generate a noise reduction signal to cancel the noise signal based on these characteristics using the signal generator 330, thereby partially or completely eliminating the noise signal generated by the motor 210 of the fan assembly 200 during operation.

[0114] In other embodiments, although the related technology reduces the noise generated when air flows in the cavity 101 by improving the structure of the fan housing 120, some noise will still inevitably be generated when air flows in the cavity 101. Therefore, in some embodiments, the plurality of sound sensors 311 also include a fourth microphone 311d, which is respectively disposed on the inner wall near the air inlet 102, the air outlet 103 and the center of the air duct 106 in the cavity 101, and is configured to collect noise signals from the air inlet 102, the air outlet 103 and the center of the air duct 106.

[0115] Thus, the fourth microphone 311d can collect noise signals generated when air flows in the cavity 101 and transmit the noise signals to the signal processor 320 to extract the amplitude, frequency and phase characteristics of the noise signals. Based on these characteristics, the signal generator 330 generates a noise reduction signal to cancel the noise signals, thereby eliminating the noise signals generated in the air inlet 102, air outlet 103 and air duct center 106 in the cavity 101 when the fan assembly 200 is running.

[0116] In one embodiment, such as 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 connected in sequence.

[0117] Among them, the filter is used to perform real-time filtering processing on the static noise signals collected by each sound sensor to obtain the filtered noise signal;

[0118] In some embodiments, the filtering process is to solve the frequency aliasing of the audio signal, and when the analog signal is discretely collected, a low-pass filter can be used to sample it to obtain a filtered noise signal.

[0119] In other embodiments, the signal processor 320 at least includes a plurality of filters 321. The plurality of filters 321 includes, but is not limited to, an IIR (Infinite Impulse Response) filter, a Biquad filter. 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 use of a combination of these filters 321 achieves the reduction of the noise frequency band of the noise signal, which can achieve the purpose of preliminary reduction of the specific noise signal.

[0120] The signal synthesizer 322 is configured to perform signal fusion processing on the filtered noise signals to obtain a dynamically composed comprehensive noise signal.

[0121] Specifically, the signal synthesizer 322 can convert the multiple filtered noise signals into one comprehensive noise signal according to an object-based audio (object-based audio) encoding mode. In some embodiments, the signal synthesizer 322 is configured to re-encode the multiple filtered noise signals according to an NGA audio encoding format (i.e., an object-based audio encoding mode), that is, to transcode the multiple filtered noise signals. In this way, all noise signals are fused into one comprehensive noise signal, so that only one decoder is needed for decoding when signal amplification is performed. The object-based audio encoding mode can be AC-4, MPEG-H, DTS-UHD, but is not limited thereto.

[0122] In an embodiment, the multiple filtered noise signals can be dynamically transcoded and fused into one comprehensive noise signal by an audio mixer or an audio interface. The core principle of the audio mixer or the audio interface is to combine, adjust and process the amplitudes and frequency responses of the multiple filtered static noise signals to dynamically generate a comprehensive audio signal. In this way, multiple noise sources can be balanced and mixed without loss of sound quality, thereby achieving an ideal noise reduction effect.

[0123] In some embodiments, the mixer is specifically designed for mixing multiple audio signals. Its basic functions include: ① Each input signal of its input channel can be accessed through an independent channel to the mixer. 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 combines all adjusted signals into a comprehensive output signal inside the mixer and outputs it through the mixer's output port, which can be connected to speakers or other devices.

[0124] 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 Support multi-channel input connection of multiple audio sources. ② It includes a converter inside to convert analog audio signals into digital signals, while some basic mixing processing may be performed. ③ It can be used with a digital audio workstation (DAW), and users can adjust the mixing, such as volume, sound phase, and effects, in the software, and finally output a single path.

[0125] Among them, the signal amplifier 323 is used for signal amplification processing of the comprehensive noise signal to obtain a comprehensive amplified signal.

[0126] In some embodiments, the signal amplifier 323 is used to enhance the amplitude of the comprehensive noise signal to improve its strength and quality during transmission, processing or output. Among them, 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 they work effectively.

[0127] Among them, the analog-to-digital converter 324 is used for analog-to-digital conversion processing of the comprehensive amplified signal to obtain a corresponding pulse code signal.

[0128] In some embodiments, the pulse code signal is an audio pulse code modulation (PCM) signal.

[0129] Specifically, the analog-to-digital converter 324 (ADC, Analog-to-Digital Converter) is an electronic device or circuit that converts analog signals into digital signals. This process is called analog-to-digital conversion, and its purpose is to make analog signals (i.e. comprehensive amplified signals) can be processed by digital computers or computer chips 325.

[0130] In some embodiments, the basic steps of analog-to-digital conversion are as follows:

[0131] ①Input Integrated Amplification Signal: Generally, this integrated amplification signal is an amplified analog signal, such as the output from an audio amplifier, temperature sensor, or other sensor.

[0132] ②Sampling: 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 (usually twice the signal frequency) to ensure the integrity of the signal.

[0133] ③Quantization: The sampled analog signal value is converted into a discrete digital value. At this time, quantization error may occur.

[0134] ④Encoding: The quantized value is encoded into a digital signal, usually in binary form (such as pulse code modulation, PCM), and output as a digital signal.

[0135] In some embodiments, pulse code modulation (PCM) is a digital signal representation method widely used in audio, video, and other analog signal digital representation. 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 after PCM encoding are less susceptible to noise interference during transmission, and can reduce transmission bandwidth through compression techniques.

[0136] Among them, the computer chip 325 is used to perform phase inversion processing on the pulse code signal to obtain anti-phase signal data, and generate signal generation instructions based on the anti-phase signal data.

[0137] In an embodiment, the audio generation instruction includes pulse code data with the same frequency and amplitude as the pulse code signal, but with opposite phase.

[0138] In some embodiments, the computer chip 325 can determine the spectral range and size corresponding to the pulse code signal by analyzing the Hanning window spectrum of the pulse code signal, and calculate the corresponding anti-phase signal data.

[0139] Specifically, when analyzing the spectrum of the pulse code signal, using the Hanning window is an effective means to reduce spectral leakage and improve the accuracy of spectral estimation. The steps are as follows:

[0140] 1. Signal preprocessing

[0141] Before processing the pulse code signal, the computer chip 325 applies the Hanning window function to the original signal for window function processing. This can be achieved through the following formula:

[0142]

[0143] where N is the length of the signal.

[0144] 2. Compute the spectrum

[0145] The computer chip 325 performs a Fast Fourier Transform (FFT) on the windowed signal to compute the spectrum. The FFT can be performed by the following equation:

[0146]

[0147] where X[k] is the spectrum and x[n] is the time domain signal after windowing.

[0148] 3. Extract the frequency and amplitude

[0149] The computer chip 325 performs a spectral analysis of the spectrum based on the results of the FFT to extract the frequency and amplitude of the signal. The steps include:

[0150] First, the amplitude spectrum is computed: Then, the main frequency components and their corresponding amplitudes are found.

[0151] 4. Compute the anti-signal data

[0152] The computer chip 325 computes the anti-signal data: To obtain an anti-signal with the opposite phase, first determine the amplitude A and phase φ of a certain frequency f. The anti-signal can be represented as:

[0153] A 反 = A, φ 反 = φ + π.

[0154] This means that if the original signal has a complex representation at frequency f of X = Ae jφ ;

[0155] Thus, the anti-signal data can be represented as X 反 = Ae j(φ+π) = -Ae jφ .

[0156] 5. Apply the anti-signal data

[0157] The computer chip 325 generates signal generation instructions based on the anti-signal data, such that when the anti-signal in the signal generation instructions is superimposed with the noise signal, they will cancel each other out in the same frequency range, thereby achieving the effect of noise reduction or interference suppression.

[0158] In some embodiments, the computer chip 325 can be an integrated circuit chip with signal processing capability. The computer chip 325 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; or a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), embedded ARM, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The general-purpose processor can be a microprocessor. The computer chip 325 can also be any conventional processor, etc., which is not limited in the present application.

[0159] In an embodiment, the signal generator 330 includes at least one sound player 331 and a power amplifier 332 corresponding to each target point.

[0160] The power amplifier 332 is configured to amplify the anti-phase signal data carried by the signal generation instruction to obtain a power amplified signal.

[0161] Specifically, the power amplifier 332 includes a power amplification circuit, which includes a signal input end and a signal output end. The signal input end of the power amplification circuit is electrically connected to the computer chip 325. The computer chip 325 includes a plurality of signal output ports for outputting the generated signal generation instruction. The signal input end of the power amplification circuit is electrically connected to the signal output port of the computer chip 325. The signal output end of the power amplification circuit is electrically connected to the sound player 331. The power amplification circuit is configured to amplify the anti-phase signal data generated by the computer chip 325, which has the same amplitude as the collected noise.

[0162] The sound player 331 is configured to emit a noise reduction signal having the same frequency and amplitude as the comprehensive noise signal but having an opposite phase according to the power amplified signal.

[0163] Specifically, after the computer chip 325 calculates the anti-phase signal data, it needs to be played out by the sound player 331 to interfere or interfere with the noise signal, so as to cancel part or all of the noise signal.

[0164] In some embodiments, the signal generator 330 outputs the anti-phase signal data inputted by the computer chip 325 to the sound players 331 after digital-to-analog conversion and signal amplification. The anti-phase signal data is mainly used to suppress the noise signal of the original environment, which is called active noise reduction. The principle of active noise reduction is shown in Figure 6

[0165] Therefore, the signal generator 330 can include a plurality of sound players 331, which form a one-to-one corresponding relationship with the sound sensors 311 in position, so that the noise reduction signals played by different sound players 331 can eliminate the corresponding noise signals.

[0166] Specifically, please continue as Figure 3 shown, since the noise of the fan assembly 200 is mainly generated when the fan blades 220 rotate, in a possible implementation, the plurality of sound players 331 includes 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 configured to play an anti-phase noise reduction signal to the rotating blade 222. The second speaker 331b is arranged on the hub 221 of the fan blade 220 and is configured to play an anti-phase noise reduction signal to the rotating hub 221.

[0167] In this way, the first speaker 331a can play an anti-phase noise reduction signal to the rotating blade 222 according to the signal generation instruction issued by the computer chip 325, so as to offset the noise signal generated in the target area, thereby partially or completely eliminating the noise generated when the blade 222 of the fan blade 220 rotates. Similarly, the second speaker 331b can play an anti-phase noise reduction signal to the rotating hub 221 according to the signal generation instruction issued by the computer chip 325, so as to offset the noise signal generated in the target area, thereby partially or completely eliminating the noise generated when the hub 221 of the fan blade 220 rotates.

[0168] Please continue as Figure 3 shown, in addition to the hub 221 and the blade 222 generating relatively large noise when rotating, the rotor assembly 212 of the motor 210 also generates noise signals when cutting magnetic lines, and the friction between the rotor assembly 212 and the stator assembly 211 also generates noise signals. In some embodiments, the plurality of sound players 331 further includes a third speaker 331c. The third speaker 331c is arranged on the inner wall near the motor 210 in the cavity 101 and is configured to play an anti-phase noise reduction signal to the rotating motor 210.

[0169] ​Thus, the third loudspeaker 331c can play the anti-phase noise reduction signal to the running motor 210 according to the signal generation instruction from the computer chip 325, so as to offset the noise signal generated in the target area, thereby partially or completely eliminating the noise generated by the motor 210 of the fan assembly 200 when running.

[0170] In other embodiments, although the noise generated by the air flowing in the cavity 101 is reduced by improving the structure of the air shell 120 in the related art, the noise generated by the air flowing in the cavity 101 is still unavoidable, and therefore, in some embodiments, the plurality of sound players 331 further comprises a fourth loudspeaker 331d, which is arranged on the inner wall near the air inlet 102, the air outlet 103 and the air duct center 106 in the cavity 101 respectively, and is configured to play an anti-phase noise reduction signal to the target area near the air inlet 102, the air outlet 103 and the air duct center 106.

[0171] Thus, the fourth loudspeaker 331d can play the anti-phase noise reduction signal to the target area near the air inlet 102, the air outlet 103 and the air duct center 106 respectively according to the signal generation instruction from the computer chip 325, so as to offset the noise signal generated in 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.

[0172] In other embodiments, the sound player 331 for each target area can further comprise a plurality of noise reduction loudspeakers, and at least two noise reduction loudspeakers have different orientations.

[0173] That is, when collecting the noise signal, the plurality of signal collectors 310 will collect the noise signals of different parts of the fan assembly 200, in order to offset different noise signals, different offset sound wave signals need to be generated and played according to the propagation direction of different noise signals, therefore, when playing, the propagation direction of the noise reduction signal for different noise signals will also be different, so the sound playing direction of the plurality of noise reduction loudspeakers is different, so as to eliminate the noise signals propagating from different directions.

[0174] In some embodiments, the number of noise reduction loudspeakers can be even, and the plurality of noise reduction loudspeakers are arranged in a circle, and the orientations of the opposite two noise reduction loudspeakers are away from each other.

[0175] Exemplarily, the number of the noise reduction speakers can be four or six. When the number of the noise reduction speakers is four, two adjacent noise reduction speakers are arranged at an angle of 90 degrees, and each of the noise reduction speakers faces outward. When the number of the noise reduction speakers is six, two adjacent noise reduction speakers are arranged at an angle of 60 degrees, and two opposite noise reduction speakers face each other in opposite directions. In this way, the plurality of noise reduction speakers can play noise reduction sound signals in all directions to better eliminate noise.

[0176] In an embodiment, referring to Figure 7 and Figure 8 The signal processor 320 further comprises an amplitude comparator 326, an input end of the amplitude comparator 326 being electrically connected with the analog-to-digital converter 324, and an output end of the amplitude comparator 326 being electrically connected with the computer chip 325.

[0177] The amplitude comparator 326 is configured to obtain the pulse coded signal, extract a noise amplitude sequence from the pulse coded signal, compare the noise amplitude sequence with a preset amplitude threshold, and obtain a first comparison result.

[0178] In some embodiments, the computer chip 325 is further configured 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 anti-phase 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 procedure.

[0179] Specifically, the amplitude comparator 326, the analog-to-digital converter 324, and the computer chip 325 can constitute an automatic signal processing system 340 based on amplitude comparison and active noise reduction. The various parts of the automatic signal processing system 340 and the working process thereof will be analyzed in detail below.

[0180] 1. System component introduction

[0181] Analog-to-digital converter 324 (ADC): used to convert an analog signal (i.e., a comprehensive noise signal) into a digital signal for subsequent processing modules.

[0182] Amplitude comparator 326 (Amplitude Comparator): used to obtain a pulse coded signal from the analog-to-digital converter. The amplitude sequence of the noise is extracted therefrom and compared with a preset amplitude threshold. This process allows the system to determine whether the current noise intensity needs to take noise reduction measures.

[0183] Computer Chip: The first comparison result of the amplitude comparator output is received and corresponding logical operations are performed. According to the comparison result, it is determined whether to perform phase inversion processing on the pulse coded signal, so as to generate anti-phase signal data for active noise reduction.

[0184] 2. System workflow

[0185] Signal input and conversion: The noise signal is first converted into a digital pulse coded signal by an analog-to-digital converter 324 for use by the amplitude comparator 326.

[0186] 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 value to generate the first comparison result: if the amplitude sequence is greater than the threshold value, noise reduction processing is required, and if the amplitude sequence is less than or equal to the threshold value, the noise reduction program is ended.

[0187] Anti-phase signal generation: If the first comparison result indicates that the noise amplitude sequence is greater than the amplitude threshold value, the computer chip 325 will start the phase inversion processing, including processing the pulse coded signal to generate anti-phase signal data. The anti-phase signal data is used for active noise reduction to cancel the original noise signal.

[0188] Program end: If the first comparison result shows that the noise amplitude sequence is less than or equal to the set amplitude threshold value, the noise reduction program will be ended and the signal processing will be stopped.

[0189] Among them, 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 can not process the fan noise, which is more conducive to energy saving of the noise reduction fan 10, especially in the case that the current power of the noise reduction fan 10 is too low, the standby time can be further prolonged. 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 is not performed, otherwise active noise reduction is performed.

[0190] 3. System function

[0191] Automatic control: The automatic signal processing system 340 effectively generates an automatic response program, which can adjust the noise reduction strategy according to the real-time changes of the environmental noise.

[0192] Precise noise reduction: Through amplitude comparison and phase inversion technology, the active noise reduction improves the working efficiency of the noise reduction fan 10 under different noise conditions.

[0193] 4. System settings

[0194] Threshold setting: It is crucial to set a suitable amplitude threshold for the automated signal processing system 340. If the threshold is set too high, it may result in unnecessary noise reduction; if the threshold is set too low, it may result in frequent noise reduction and unnecessary processing delay.

[0195] Delay impact: The processing delay of the automated signal processing system 340 on the signal may affect the noise reduction effect, so the automated signal processing system 340 can access the cloud to optimize the signal processing speed to ensure real-time performance.

[0196] The technical effect of the above scheme is that the combination of signal processing and intelligent control technology by the automated signal processing system can adapt to complex and variable noise environments.

[0197] In an embodiment, referring to Figure 7 and Figure 9 The signal processor 320 further includes a decibel comparator 327, the input end of which is electrically connected with the signal collector 310, and the output end of which is electrically connected with the computer chip 325.

[0198] The decibel comparator 327 is configured to obtain the residual noise signal collected by the signal collector 310 after the noise reduction signal is sent by the signal generator 330, and extract the corresponding noise decibel value from the residual noise signal, so as to compare the noise decibel value with the preset decibel threshold to obtain a second comparison result.

[0199] In some embodiments, the computer chip 325 is further configured to obtain the 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 subjected to speed reduction processing, 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.

[0200] Specifically, in order to further accurately determine the influence of fan noise on user use and experience, the decibel value of the fan noise can also be obtained to determine whether the fan is in a normal operating state through the decibel value of the fan noise, further avoiding the problem of user experience decline caused by fan abnormalities.

[0201] In some embodiments, the above-mentioned automated signal processing system 340 can further include a decibel comparator 327, thereby further perfecting the active noise reduction technology. The various parts of the automated signal processing system 340 and its working process will be analyzed in detail below.

[0202] 1. System component introduction

[0203] Signal Collector: Collects residual noise signals in real-time after the noise reduction signal is released by the signal generator.

[0204] Decibel Comparator: Receives noise signals from the Signal Collector, extracts corresponding decibel values, and compares them with preset decibel thresholds to generate a second comparison result.

[0205] Computer Chip: Receives the second comparison result from the Decibel Comparator, executes control logic to adjust the speed of the fan motor 210, and achieves further noise reduction.

[0206] 2. System Workflow

[0207] Signal Collection: After the signal generator 330 releases the noise reduction signal, the signal collector 310 begins real-time monitoring of residual noise in the environment.

[0208] Decibel Extraction and Comparison: The Decibel Comparator 327 extracts the decibel value of the noise from the collected signal, and compares the extracted decibel value with the preset decibel threshold to output a second comparison result. If the decibel value is greater than the threshold, it indicates that the residual noise is still strong, and the power or speed of the device producing noise needs to be reduced. If the decibel value is less than or equal to the threshold, it indicates that the noise has been reduced to an acceptable level, and the noise reduction program can be ended.

[0209] 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 motor operation.

[0210] 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.

[0211] 3. System Function

[0212] Dynamic Adjustment: The automated signal processing system 340 can dynamically adjust the speed of the fan motor 210 according to the changes in real-time residual noise, ensuring the lowest volume under various environmental conditions.

[0213] 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 effectiveness of active noise reduction.

[0214] 4. System Settings

[0215] Decibel threshold setting: the reasonable decibel threshold setting of the automatic signal processing system 340 is the key to success. Too high threshold may result in fan speed reduction insensitive, and too low may not effectively respond to the actual noise environment.

[0216] Fan response time: the computer chip 325 needs to react as quickly as possible to the motor 210 control to adapt to the instantaneous changes in the environmental noise, so as to achieve timely noise reduction effect.

[0217] The technical effect of the above scheme is that by combining intelligent monitoring, real-time feedback and automatic control technology, the automatic signal processing system 340 can effectively respond to environmental noise and provide a more comfortable user experience.

[0218] In some embodiments, to further improve energy saving effect, in the case that the automatic signal processing system 340 judges that the decibel value of the residual noise in the environment is not less than the preset decibel value, the fan noise can not be reduced. In specific application process, the automatic signal processing system 340 can detect the current use scene of the noise reduction fan 10, if its background noise (including user voice) is large, it will not start noise reduction, because starting noise reduction will definitely consume more power, so this way can further reduce the power consumption of the mobile phone.

[0219] In other embodiments, to further ensure the stable operation of the noise reduction fan 10 in the case of low power, the automatic signal processing system 340 can also judge whether the current power of the noise reduction fan 10 is not less than the preset power; if yes, start the built-in motor 210 of the noise reduction fan 10, otherwise, issue an alarm prompt of low power. Therefore, in the case that 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 for a reminder.

[0220] In an implementation form of the present application, the step of the automatic signal processing system 340 performing noise reduction on the fan noise according to the residual signal can comprise: when the noise signal contains a user voice signal, using a preset noise recognition model to recognize the fan noise to obtain a voice-recognized noise signal; and performing noise reduction on the voice-recognized noise signal. For example, in the user's use process, there are often interactions between multiple users, and the user needs to use voice. In order to further improve the recognition of the fan noise and avoid eliminating the user's voice information, the fan noise needs to be recognized. Specifically, the noise recognition model is established by: determining input positive samples and negative samples, wherein the positive samples are a noise training set and the negative samples are a voice training set, using a PLDA model for training to obtain an average error, and determining the noise recognition model as usable when the average error is less than a preset error. The PLDA model is trained by the positive samples and the negative samples. When the model maturity reaches the standard, the automatic signal processing system 340 recognizes the fan noise through the noise recognition model, which can accurately determine the fan noise and reduce the error of eliminating the user voice as the fan noise, thereby further improving the accuracy of fan noise elimination and improving the user experience.

[0221] The signal collector 310 picks up the residual noise after suppression, which is an analog signal. Then the signal processor 320 performs power amplification on the picked-up analog noise signal, filters out high-frequency components in the signal using a low-pass filter, and then inputs the signal after filtering out the high frequency into the automatic signal processing system 340 after analog-digital conversion. This process generates low-frequency audio data, which is provided to the automatic signal processing system 340 for further learning and evaluation of the active noise reduction effect.

[0222] In an embodiment, please refer to Figure 10 The signal processor 320 further comprises an error collection part 328 arranged in the cavity 101 and electrically connected with the computer chip 325, which 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 325 to calibrate the noise reduction signal through the computer chip 325.

[0223] The error collection part 328 is configured to detect the error between the noise signal collected by the signal collector 310 and the noise reduction signal played by the signal generator 330.

[0224] Specifically, to improve the noise reduction effect of the noise reduction fan 10, the noise reduction fan 10 is also provided with an error collection part 328 for detecting 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 feeding back to the computer chip 325 in the signal processor 320 to calibrate the noise reduction signal, so as to make the counter signal data in the signal generation instruction generated by the computer chip 325 more in line with the noise reduction requirements.

[0225] In some embodiments, the error collection part 328 mentioned above and the signal collector 310, the signal generator 330 and the computer chip 325 can constitute a signal feedback control system 350 based on a signal feedback control mechanism, which 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 working process will be analyzed in detail below.

[0226] 1. System components

[0227] Error collection part 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 feedback to the signal processor 320.

[0228] 2. System workflow

[0229] Signal input: noise signal is captured and input to the computer chip 325 for analysis and processing.

[0230] Generate noise reduction signal: the computer chip 325 generates a noise reduction signal based on the processed data, aiming to intervene and reduce the noise signal.

[0231] Error calculation: the error collection part 328 receives the noise signal and the noise reduction signal, and calculates the error signal data through mathematical algorithms (such as difference or other error evaluation methods). The following formula can be used: error signal data = noise signal - noise reduction signal.

[0232] Data feedback: the calculated error signal data is fed back to the computer chip 325, providing real-time information about the noise reduction effect.

[0233] Signal calibration: the computer chip 325 calibrates the noise reduction signal according to the feedback error signal data. The amplitude, phase or frequency of the noise reduction signal can be adjusted to better combat the noise signal. The calibrated noise reduction signal is output again to improve the noise reduction performance of the system.

[0234] 3. System functions

[0235] Real-time feedback: The signal feedback control system 350 can quickly respond to the noise reduction effect through real-time feedback of the error collection unit 328, thereby making necessary adjustments to improve noise reduction accuracy.

[0236] Adaptive calibration: The signal processor 320 can dynamically adjust the noise reduction signal according to the real-time calculated error signal, adapt to different noise environments, and improve the adaptability and effect of active noise reduction.

[0237] 4. System settings

[0238] Calculation delay: The delay of the error calculation and feedback system 350 may affect the noise reduction effect. Therefore, the response time can be reduced by optimizing the algorithm.

[0239] Noise mode settings: Different noise signals may require different noise reduction strategies, so the signal processor 320 can be designed to flexibly handle multiple noise modes.

[0240] Environmental adaptability settings: Ensure that the signal feedback control system 350 maintains effective noise reduction function under different environmental conditions (such as different types of noise, background changes, etc.).

[0241] The technical effects of the above technical solutions are: by designing a feedback control system, using the cooperative work of the error collection unit and the computer chip, the performance and flexibility of the active noise reduction system can be greatly improved. The design effectively ensures the real-time and accuracy of the noise reduction signal, and improves the user experience.

[0242] In an embodiment, referring to Figure 11 The portable active noise reduction fan 10 also includes a memory 400 disposed in the cavity 101 for storing a pre-set speed and noise comparison table 410 and a noise reduction signal database 420. The speed and noise comparison table 410 is used to represent 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 that are opposite in phase, the same in frequency and amplitude, and match a variety of pre-set noise signals.

[0243] The noise reduction assembly 300 is also used to obtain the real-time speed of the motor 210 when the fan assembly 200 is running, and determine the target noise signal that matches the real-time speed according to the speed and noise comparison table 410, and determine the target noise reduction signal that matches the target noise signal from the noise reduction signal database 420, to perform active noise control on the fan assembly 200 based on the target noise reduction signal.

[0244] In some embodiments, the memory 400 can be used to store software programs and various data. The memory 400 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required by at least one function (such as a sound playing function), etc.; and the data storage area can store data (such as audio data) created according to the use of the noise reduction fan 10, etc. In addition, the memory 400 can include a high-speed random access memory, and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device.

[0245] According to embodiments of the present application, the signal collector 310 can be one or more devices for collecting noise-related signals. In the present application, the signal collector 310 can acquire noise-related signals through both the sound sensor 311 and the memory 400. The signal collector 310 is a device placed in a noise control target area around the motor 210 to collect noise in real time, and the memory 400 is a storage device pre-stored with fan 10 noise characteristic signals.

[0246] When the signal collector 310 acquires noise signals through the sound sensor 311, the sound sensor 311 transmits the acquired noise signals back to the signal processor 320, which analyzes the acquired noise signals and transmits them to the signal generator 330. Alternatively, the sound sensor 311 can transmit the acquired noise signals directly to the memory 400 without passing through the signal processor 320, and the memory 400 can acquire target noise reduction signals through the noise reduction signal database 420. The sound sensor 311 can transmit noise-related signals through wireless transmission or wired transmission, and the memory 400 can simultaneously receive or output multiple noise signals.

[0247] In an embodiment, when the signal collector 310 acquires noise signals through the memory 400, the signal collector 310 first acquires the real-time speed of the motor 210, and then transmits the real-time speed to the memory 400 to determine the target noise signal matching the real-time speed from the speed-noise correlation table 410. Then, the signal collector 310 determines the target noise reduction signal matching the target noise signal from the noise reduction signal database 420, and finally transmits the target noise reduction signal to the sound player 331 to play the target noise reduction signal and cancel the target noise signal.

[0248] According to the embodiments of the present application, the sound player 331 can include multiple loudspeakers. There are many kinds of loudspeakers, which are classified by transduction mechanism and structure into moving-coil (dynamic), moving-iron (electrodynamic), moving-capacitor (electrostatic), moving-piezoelectric (crystal or ceramic), moving-magnetic (reeds), moving-ion, and moving-air (pneumatic) loudspeakers. The multiple loudspeakers of the sound player 331 can be installed together on the nacelle and / or the dome and / or the tower in different directions and at different angles to form multiple loudspeaker assemblies, and the fixed parts of the loudspeaker assemblies are built into the cavity 101. Each loudspeaker can effectively control a fan-shaped area to cancel noise in the noise control target area. According to the embodiments of the present application, for example, four loudspeaker assemblies are installed on both sides of the nacelle and both sides of the dome, respectively, each loudspeaker assembly includes three loudspeakers, and each loudspeaker can effectively control a fan-shaped area with a range of 30 degrees. Therefore, each loudspeaker assembly covers an area with a range of 90 degrees, and the four loudspeaker assemblies can cover the noise control area around the nacelle in all directions. In addition, the multiple loudspeakers of the sound player 331 can also be fixed on the steering gimbal of the motor 210. The steering gimbal refers to a support device for installing and fixing multiple loudspeakers and controlling the rotation direction of the multiple loudspeakers. The steering gimbal includes a multi-axis gimbal and a single-axis gimbal, and is usually embedded on the nacelle and / or the dome and / or the tower to drive the multiple loudspeakers to rotate to comprehensively cover the noise control target area around the motor 210. The noise control target area is an area in which the influence of the noise of the motor 210 needs to be reduced.

[0249] In other embodiments, the computer chip 325 in the noise reduction assembly 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 assembly 200 according to the filter parameters.

[0250] In the present embodiment, the signal collector 310 triggers the corresponding filter to perform real-time filtering processing 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 the noise-reduced audio signal. In the present embodiment, the noise-reduced audio signal is an audio pulse code modulation signal.

[0251] Specifically, the analog-to-digital converter 324 in the noise reduction assembly 300 receives the target noise signal matched out 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.

[0252] In an embodiment, the portable active noise reduction fan 10 at least includes a handheld fan for handheld wireless use, a neck fan for hanging neck use, or a binding fan for binding use.

[0253] Among them, the handheld wireless use handheld fan is a portable electric fan, which is characterized by wireless design, allowing users to use it without being limited by power lines, making it convenient to carry and use. It is a variant of handheld small fans, highlighting its wireless features. The main functions of the handheld wireless use handheld fan include: ① wireless portability: powered by a built-in rechargeable battery, no need to plug in to use, suitable for a variety of indoor and outdoor scenes. ②Multiple wind speed options: The wireless small fan provides multiple wind speed settings, allowing users to adjust the intensity of the wind as needed. ③Convenient charging: The handheld wireless small fan can be charged through a USB interface, making it easy to connect to a power bank or computer for charging. ④Multi-function in one: The handheld fan can include additional features such as misting, LED lights, or even a Bluetooth speaker. ⑤Easy to store: Its lightweight design makes it easy to pack into a bag, making it ideal for travel. The main features of the handheld wireless use handheld fan include: ①Lightweight design: The handheld fan can be made of lightweight materials, weighing between 200 and 500 grams, making it easy to hold for long periods of time. ②High safety: The handheld fan can use a bladeless design or an anti-pinch hand design to ensure safety in use. ③Fashionable appearance: The fan has a modern design appearance, with a variety of colors and shapes to meet the fashion needs of young people. ④Quiet operation: The fan has an optimized motor and fan design that keeps noise levels low during operation, making it ideal for users who need a quiet environment. ⑤Long-lasting battery life: The fan's built-in battery provides several hours of continuous use, meeting daily needs. Therefore, this kind of handheld wireless use handheld fan is very suitable for use in hot weather, especially for outdoor activities, travel, or just enjoying the cool breeze at home.

[0254] 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 more direct cooling effect, which is very suitable for hot summer or outdoor activities. The functions of the neck-hanging fan mainly include: ①Hands free use: Since it is hung on the neck, the user's hands can be used freely without holding the fan. ②Convenient to carry: The lightweight design makes it suitable for carrying around, suitable for use in travel, sports, work and other occasions. ③Multiple wind speed: The neck-hanging fan can provide multiple wind speed settings, which can be selected according to different needs. ④Charging function: The neck-hanging fan can be charged through the USB interface, which can be charged using a mobile power supply or a computer. ⑤360-degree rotation: The neck-hanging fan can be designed to adjust the wind direction, so that the angle of the fan can be freely rotated to meet individual needs. The characteristics of the neck-hanging fan mainly include: ①Wearing comfortable: It can be made of soft material or lightweight design to ensure that there is no burden or discomfort when wearing. ②Silent design: The neck-hanging fan optimizes the motor and fan design to reduce noise, suitable for use in quiet environments such as offices or libraries. ③Multiple styles: The neck-hanging fan is configured with multiple styles and colors, which can match different clothes and occasions. ④High safety: The neck-hanging fan can adopt a fan blade-free design to avoid injury caused by touching the fan blades with fingers. ⑤Long-lasting battery life: The neck-hanging fan is equipped with a long-lasting battery that can support several hours of continuous use, meeting most daily needs. Therefore, this kind of neck-hanging fan is especially suitable for use in hot weather, especially in outdoor activities, fitness, travel and other occasions, which can effectively improve the comfort.

[0255] The binding fan is a unique design of portable fan, which is usually used to fix in a specific position or bind to an object to provide circulating air flow or cooling effect. This fan is particularly suitable for some special occasions, such as outdoor camping, cycling or use in fixed working environment. The functions of the binding fan mainly include: ① fixed use: the fan can be fixed on a chair, tent, shed, etc. by a rope, clip or other fixing device, realizing long time use. ② wind speed adjustment: the binding fan can provide multiple wind speed, and users can select different wind speed settings according to specific needs. ③ multi-scene application: the binding fan can be suitable for outdoor, camping, sports, home use and other scenes. ④ portable charging: the binding fan can adopt USB charging design, which is convenient for moving and charging. The characteristics of the binding fan mainly include: ① flexibility: the fan itself can be adjusted at different positions and angles, and the wind direction can be freely adjusted. ② lightweight design: the design of the binding fan is light and easy to carry and install, without adding too much weight burden. ③ durability: the binding fan adopts wear-resistant materials, which is suitable for outdoor environment and can withstand wind and rain. ④ quiet operation: the binding fan adopts silent design to ensure the minimum noise during use, which is suitable for use in quiet environment. ⑤ various styles: the binding fan is equipped with binding fans of different colors and designs, so that consumers can choose according to their personal preferences. Therefore, the flexibility and portability of the binding fan make it an ideal choice for many outdoor activities or fixed locations.

[0256] The technical effect of the above scheme is that: on the one hand, the fan assembly and the noise reduction assembly are accommodated in the cavity by 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 means different from the prior art, the noise reduction assembly function is reasonably designed, which can dynamically analyze various static noise signals, including inlet noise, outlet noise, fan blade noise and / or motor noise, so as to collect dynamic comprehensive noise signals generated inside and outside the cavity in real time when the fan assembly is running, and according to the noise signals, the corresponding phase opposite, frequency and amplitude same noise reduction signals are emitted, so as to cancel the noise signals and realize active noise control of the fan assembly, so as to reduce the noise level of the fan during operation.

[0257] Figure 12 is a block diagram of an electronic device 20 provided by an embodiment of the present application. For example, the electronic device 20 can be a handheld fan for handheld wireless use, a neck-hanging fan for neck-hanging use, or a binding fan for binding use, etc. Referring to Figure 12The electronic device 20 includes a processor 21, which can be a set of processors, which can include one or more processors, and the electronic device 20 includes memory resources represented by a memory 22, in which a computer program, such as an application program, is stored. The computer program stored in the memory 22 can 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 automated signal processing program, and the signal feedback control program as described above when executing the computer program.

[0258] 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 commercially available server operating system. The electronic device 20 can also run any of a variety of additional server applications and / or middleware applications, including HTTP (HyperText Transfer Protocol) servers, FTP (File Transfer Protocol) servers, CGI (Common Gateway Interface) servers, hyper servers, database servers, and the like. Exemplary database servers include, but are not limited to, database servers commercially available from International Business Machines (IBM®), Oracle®, Microsoft® and the like.

[0259] In some embodiments, the processor 21 generally controls the overall operations of the electronic device 20, such as operations associated with display, data processing, data communication, and recording operations. The processor 21 can include one or more processor components to execute computer programs to complete all or part of the steps of the control programs described above. In addition, the processor components can include one or more modules to facilitate interaction between the processor components and other components. For example, the processor components can include a multimedia module to facilitate interaction between the user electronic device 20 and the processor 21 using the multimedia components.

[0260] In some embodiments, the processor component in the processor 21 can also be referred to as a CPU (Central Processing Unit). The processor component can be an electronic chip with the processing capability of signals. The processor can 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 device, a discrete gate or transistor logic device, a discrete hardware component. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor component, etc. In addition, the processor component can be realized by integrated circuit chips together.

[0261] In some embodiments, the memory 22 is configured to store various types of data to support the operation of the electronic device 20. Examples of these data include instructions for any application program operating on the electronic device 20, collected data, messages, signals, etc. The memory 22 can be realized 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.

[0262] In some embodiments, the memory 22 can be a memory stick, a TF card, etc., and can store all information in the electronic device 20, including input raw data, computer programs, intermediate running results and final running results, which are saved in the memory 22. In some embodiments, it stores and retrieves information according to the location specified by the processor 21. In some embodiments, with the memory 22, the electronic device 20 has a memory function and can work normally. In some embodiments, the memory 22 of the electronic device 20 can be divided into main memory (memory) and auxiliary memory (external memory) according to the purpose, and there is also a classification method of external memory and internal memory. The external memory is usually a magnetic medium or an optical disk, etc., which can save information for a long time. The memory refers to the storage component on the motherboard, which is used to store the data and programs currently being executed, but only for temporary storage of programs and data, and the data will be lost when the power is off.

[0263] In some embodiments, the electronic device 20 can 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 server 20 to a network, and an input output (I / O) interface 25. The electronic device 20 can operate based on an operating system stored in the memory 22, such as Windows Server, Mac OSX, Unix, Linux, FreeBSD, or the like.

[0264] In some embodiments, the power supply component 23 provides power to the various components of the electronic device 20. The power supply component 23 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 20.

[0265] 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, a carrier network (e.g., 2G, 3G, 4G, or 5G), or a combination thereof.

[0266] 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 one example embodiment, the wired or wireless network interface 24 further 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.

[0267] In some embodiments, the input output (I / O) interface 25 provides an interface between the processor 21 and peripheral interface modules, which can be a keyboard, a click wheel, a button, or the like. These buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0268] Figure 13 is a block diagram of a computer readable storage medium 30 provided by an embodiment of the present application. The computer readable storage medium 30 stores a computer program 31, wherein the computer program 31, when executed by the processor 21, implements the active noise reduction program, the automated signal processing program, and the signal feedback control program as described above.

[0269] The units integrated in each function unit in the embodiments of the present application, if realized in the form of software function units and sold or used as an independent product, can be stored in the computer readable storage medium 30. Based on such understanding, the technical solutions of the present application essentially or say the parts that make contributions to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer readable storage medium 30 stores a computer program 31 including a plurality of instructions for causing a computer device (which can be a personal computer, a system server, or a network device, etc.), an electronic device (for example, a handheld electric fan, etc., which can also be a desktop fan, a wearable fan, etc.) or a processor to perform all or part of the steps of the method of each embodiment of the present application.

[0270] Figure 14 FIG. 4 is a block diagram of a computer program product 40 provided by an embodiment of the present application. The computer program product 40 includes program instructions 41 executable by the processor 21 to implement the active noise reduction program, the automated signal processing program and the signal feedback control program as described above.

[0271] Those skilled in the art should understand that the embodiments of the present application can provide the active noise reduction program, the automated signal processing program and the signal feedback control program, the portable active noise reduction fan 10, the electronic device 20, the computer readable storage medium 30 or the computer program product 40. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of the 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.

[0272] The present application is described with reference to the flowcharts and / or block diagrams according to the active noise reduction program, the automated signal processing program and the signal feedback control program, the portable active noise reduction fan 10, the electronic device 20, the computer readable storage medium 30 or the computer program product 40 in the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be realized by the computer program product 40. These computer program products 40 can be provided to the processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing devices to produce a machine, so that the program instructions 41 executed by the processor of the computer or other programmable data processing devices produce a device for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The device for implementing the functions specified in the flow or multiple flows and / or blocks. Figure 1 The device for implementing the functions specified in the flow or multiple flows and / or blocks.

[0273] These computer program products 40 can also be stored in a computer readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the program instructions stored in the computer program products 40 produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0274] These program instructions 41 can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the program instructions 41 which execute on the computer or other programmable apparatus provide steps to implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 Figure 1 of the block or blocks.

[0275] It is to be understood that the various programs, electronic devices, computer readable storage media, computer program products, etc. described above can also include other implementations not explicitly described above. The description above is merely meant to be exemplary and the true scope and spirit of the disclosure is indicated by the following claims.

[0276] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features of the disclosure disclosed herein. It is intended that the disclosure be construed as including any variations, uses or adaptations of the specific embodiments and examples disclosed and that modifications be made within the scope of the disclosure and equivalents thereof. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0277] It is to be understood that the disclosure is not limited to the precise construction described above and shown in the attached drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the disclosure is limited only by the claims that follow.

Claims

1. A portable active noise reducing fan, characterized by, The portable active noise reduction fan comprises: a shell, which is a portable shell body, has a cavity inside the shell body, and is provided with an air inlet and an air outlet at two ends of the shell body, which are in communication with each other; a fan assembly arranged in the cavity, which is used to rotate to generate air pressure, so as to suck air from the air inlet, pass through the cavity, and then blow out from the air outlet; a noise reduction assembly arranged in the cavity, which is used to collect noise signals inside and outside the cavity in real time when the fan assembly is running, and emit noise reduction signals according to the noise signals. The noise signals are dynamic comprehensive noise signals including inlet noise, outlet noise, fan blade noise and / or motor noise.

2. The portable active noise reducing fan of claim 1, wherein, The noise reduction assembly comprises: a signal collector arranged in the cavity, which is used to collect the noise signals in real time when the fan assembly is running; a signal processor arranged in the cavity and electrically connected with the signal collector, which is used to obtain the noise signals and generate signal generation instructions according to the noise signals; a signal generator arranged in the cavity and electrically connected with the signal processor, which is used to obtain the signal generation instructions and emit the noise reduction signals according to the signal generation instructions. Within a preset error allowable range, the noise reduction signals are opposite in phase, same in frequency and amplitude with the noise signals, so as to perform destructive interference on the noise signals and achieve active noise control of the fan assembly.

3. The portable active noise reducing fan of claim 2, wherein, The signal collector comprises at least one sound sensor arranged at at least one corresponding target point in the cavity, which is used to collect static noise signals near each target point in real time. The target points at least include edge positions of the air inlet and the air outlet, nearby positions of the motor and the fan blade, and a nearby position of the air duct center. The inlet noise includes static inlet noise generated when the portable active noise reduction fan is fixedly used and dynamic inlet noise generated when the portable active noise reduction fan is used by shaking; the outlet noise includes static outlet noise generated when the portable active noise reduction fan is fixedly used and dynamic outlet noise generated when the portable active noise reduction fan is used by shaking; the fan blade noise includes static fan blade noise generated when the portable active noise reduction fan is fixedly used and dynamic fan blade noise generated when the portable active noise reduction fan is used by shaking; and the motor noise includes static motor noise generated when the portable active noise reduction fan is fixedly used and dynamic fan blade noise generated when the portable active noise reduction fan is used by shaking.

4. The portable active noise reducing fan of claim 3, wherein, The signal processor comprises 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 processing on the noise signals collected by each sound sensor to obtain filtered noise signals. The signal synthesizer is used to perform signal fusion processing on each filtered noise signal to obtain a dynamically composed comprehensive noise signal. The signal amplifier is used to perform signal amplification processing on the comprehensive noise signal to obtain a comprehensive amplified signal. The analog-to-digital converter is configured to perform analog-to-digital conversion on the integrated amplified signal to obtain a corresponding pulse coded signal. The computer chip is configured to perform phase inversion processing on the pulse coded signal to obtain an anti-phase signal data, and generate the signal generation instruction based on the anti-phase signal data.

5. The portable active noise reducing fan of claim 4, wherein, The signal generator comprises at least one sound player and a power amplifier arranged at each of the target points; The power amplifier is configured to amplify the anti-phase signal data carried by the signal generation instruction to obtain a power amplified signal. The sound player is configured to emit a noise reduction signal having the same frequency and amplitude but opposite phase to the integrated noise signal according to the power amplified signal.

6. The portable active noise reducing fan of claim 4, wherein, The signal processor further comprises an amplitude comparator, an input end of the amplitude comparator being electrically connected with the analog-to-digital converter, and an output end of the amplitude comparator being electrically connected with the computer chip. The amplitude comparator is configured to obtain the pulse coded signal, extract a corresponding noise amplitude sequence from the pulse coded signal, compare the noise amplitude sequence with a preset amplitude threshold, and obtain a first comparison result. The computer chip is further configured to obtain the first comparison result, perform phase inversion processing on the pulse coded signal to obtain the anti-phase signal data when the first comparison result indicates that the noise amplitude sequence is greater than the amplitude threshold, or end the noise reduction program when the first comparison result indicates that the noise amplitude sequence is less than or equal to the amplitude threshold.

7. The portable active noise reducing fan of claim 4, wherein, The signal processor further comprises a decibel comparator, an input end of the decibel comparator being electrically connected with the signal collector, and an output end of the decibel comparator being electrically connected with the computer chip. The decibel comparator is configured to obtain a residual noise signal collected by the signal collector after the signal generator emits the noise reduction signal, extract a corresponding noise decibel value from the residual noise signal, compare the noise decibel value with a preset decibel threshold, and obtain a second comparison result. The computer chip is further configured to obtain the second comparison result, perform speed reduction processing on the motor of the fan assembly when the second comparison result indicates that the noise decibel value is greater than the decibel threshold, or end the noise reduction program when the second comparison result indicates that the noise decibel value is less than or equal to the decibel threshold.

8. The portable active noise reducing fan of claim 4, wherein, The signal processor further comprises: The error collection member is arranged in the cavity and electrically connected with the computer chip, configured to calculate an error between the noise signal and the noise reduction signal to obtain error signal data, and feed back the error signal data to the computer chip to perform calibration processing on the noise reduction signal by the computer chip.

9. The portable active noise reducing fan of claim 1, wherein, The portable active noise reduction fan further comprises a memory disposed in the cavity, configured to store a preset rotation speed-noise contrast table and a noise reduction signal database; wherein the rotation speed-noise contrast table is configured to represent a mapping relationship between a rotation speed of a motor in the fan assembly and a corresponding noise signal generated by the fan assembly; and the noise reduction signal database is configured to store noise reduction signals opposite in phase, same in frequency and amplitude to a plurality of preset noise signals. The noise reduction assembly is further configured to acquire a real-time rotation speed of the motor when the fan assembly is running, determine a target noise signal matched to the real-time rotation speed according to the rotation speed-noise contrast table, and determine a target noise reduction signal matched to the target noise signal from the noise reduction signal database, so as to perform active noise control on the fan assembly based on the target noise reduction signal.

10. The portable active noise reducing fan of any one of claims 1 to 9, wherein, The portable active noise reduction fan at least comprises a handheld fan for wireless handheld use, a neck-hanging fan for neck-hanging use, or a binding fan for binding use.

11. The portable active noise reducing fan of claim 10, wherein, The portable active noise reduction fan is applied to a high-speed motor with a running rotation speed exceeding a preset rotation speed; wherein the high-speed motor comprises a high-speed three-phase motor.

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