Noise reduction device and method for fan in terminal

Abstract

Embodiments of the present application relate to a noise reduction device and method for a fan in a terminal. The noise reduction device comprises: a first air duct, at least one noise reduction air duct, and a switch combination; the first air duct has one end connected to a fan air outlet and the other end connected to a terminal air outlet; the noise reduction air duct has one end connected to the fan air outlet and the other end connected to the terminal air outlet; switches in the switch combination are arranged at an air inlet and an air outlet of the noise reduction air duct, and the switch combination is used for controlling the opening or closing of the noise reduction air duct; and an air duct length difference between the first air duct and the noise reduction air duct is nL+L / 2, wherein n is a natural number, and L is a wind noise wavelength at the fan air outlet.

Description

Device and method for reducing noise of fan in terminal

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311142344.1 filed on September 5, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of terminals, and in particular to a noise reduction device and method for a fan in a terminal. Background Art

[0004] Currently, products such as mobile phones, CPE (Customer Premise Equipment), tablet computers, and laptops generate heat during use, so the terminals need to be cooled.

[0005] The current cooling method is to install a fan inside the terminal. However, the wind generated by the fan will generate noise when it is transmitted to the terminal air outlet, affecting the user experience.

[0006] Summary of the Invention

[0007] Embodiments of the present application provide a noise reduction device and method for a fan in a terminal.

[0008] In the first aspect, an embodiment of the present application provides a noise reduction device for a fan in a terminal, wherein the noise reduction device comprises: a first air duct, at least one noise reduction air duct and a switch combination; one end of the first air duct is connected to the fan outlet, and the other end of the first air duct is connected to the terminal outlet; one end of the noise reduction air duct is connected to the fan outlet, and the other end of the noise reduction air duct is connected to the terminal outlet; the switches in the switch combination are arranged at the air inlet and air outlet of the noise reduction air duct, and the switch combination is used to control the opening or closing of the noise reduction air duct; the air duct length difference between the first air duct and the noise reduction air duct is nL+L / 2, where n is a natural number and L is the wavelength of wind noise at the fan outlet.

[0009] In the second aspect, an embodiment of the present application provides a noise reduction method for a fan in a terminal, the method comprising: obtaining the current gear position at the fan outlet, wherein different gear positions correspond to different wind speeds; based on a preset mapping relationship, turning on the target noise reduction air duct corresponding to the current gear position by a control switch, wherein the preset mapping relationship indicates that different gear positions correspond to noise reduction air ducts of different lengths; through a first air duct of a fixed length and the target noise reduction air duct, the air outlet at the fan outlet is sent to the terminal outlet, so that the waveforms of the wind noise generated by the first air duct and the target noise reduction air duct at the terminal outlet are consistent, and the waveform phase difference is m 180°, wherein m is a positive integer.

[0010] In a third aspect, an embodiment of the present application provides an electronic device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to: obtain the current gear position at the fan outlet, wherein different gear positions correspond to different wind speeds; based on a preset mapping relationship, turn on the target noise reduction air duct corresponding to the current gear position through a control switch, wherein the preset mapping relationship indicates that different gear positions correspond to noise reduction air ducts of different lengths; and deliver the air outlet at the fan outlet to the terminal outlet through a first air duct of a fixed length and the target noise reduction air duct, so that the waveforms of the wind noise generated by the first air duct and the target noise reduction air duct at the terminal outlet are consistent, and the waveform phase difference is m 180°, wherein m is a positive integer.

[0011] In a fourth aspect, an embodiment of the present application further provides a computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the noise reduction method for a fan in a terminal as described in any one of the above items of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0015] FIG1 is a schematic diagram of a noise reduction device for a fan in a terminal provided by an embodiment of the present application;

[0016] FIG2 is a flow chart of a method for reducing noise of a fan in a terminal provided by an embodiment of the present application;

[0017] FIG3 is a schematic diagram of the air duct opening control process at three fan gear positions provided by an embodiment of the present application;

[0018] FIG4 is a schematic structural diagram of a noise reduction device for a fan in a terminal provided by an embodiment of the present application;

[0019] FIG5 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] The disclosure below provides many different embodiments or examples for implementing the different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the embodiments of the present application. In addition, the embodiments of the present application may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0022] An embodiment of the present application provides a noise reduction device for a fan in a terminal. As shown in FIG1 , the noise reduction device includes: a first air duct, at least one noise reduction air duct, and a switch combination.

[0023] One end of the first air duct is connected to the fan outlet, and the other end of the first air duct is connected to the terminal outlet, which is used to send air from the fan outlet to the terminal outlet. The first air duct is the air duct where the fan outlet normally flows. As shown in Figure 1, the first air duct is the air duct on the far left.

[0024] One end of the noise reduction air duct is connected to the fan outlet, and the other end of the noise reduction air duct is connected to the terminal outlet. The noise reduction air duct can be one or more. The duct length between each noise reduction air duct and the first air duct differs by nL+L / 2, where n is a natural number and L is the wavelength of wind noise at the fan outlet. As shown in Figure 1, the noise reduction air duct includes noise reduction air duct ①, noise reduction air duct ② and noise reduction air duct ③ on the right.

[0025] The switches in the switch combination are arranged at the air inlet and air outlet of the noise reduction air duct. The switch combination is used to control the opening or closing of the noise reduction air duct. That is to say, the first air duct can be opened at the same time as one noise reduction air duct, or the first air duct and multiple noise reduction air ducts can be opened at the same time.

[0026] Because the air duct length difference between the first air duct and the noise reduction air duct is nL+L / 2, the time it takes for the air from the fan outlet to reach the terminal outlet from the noise reduction air duct is nT+T / 2 later than the time it takes for the air from the first air duct to reach the terminal outlet. T is the period of the waveform. That is, on the waveform graph, the waveform of the air at the terminal outlet is consistent with the waveform of the air in the noise reduction air duct, and their phase difference is m*180°. The wind noise generated by the two winds cancels each other out, achieving the wind noise reduction function. m is a positive integer.

[0027] Regardless of whether one or multiple noise reduction ducts are opened, since the duct length difference between each noise reduction duct and the first duct is nL+L / 2, the phase difference between the wind waveform of the noise reduction duct and the wind waveform of the first duct is m*180°.

[0028] The embodiment of the present application is provided with multiple switches, and the switch configuration includes at least the following two embodiments.

[0029] In one embodiment, each air inlet or air outlet of the noise reduction air duct is provided with a switch, and the switch is used to open or close the noise reduction air duct.

[0030] In another embodiment, the same switch is used between the air inlets or air outlets of two adjacent noise reduction air ducts, and the switch is used to open one noise reduction air duct while closing the other noise reduction air duct.

[0031] Exemplarily, the noise reduction device includes a first noise reduction duct, a second noise reduction duct and a third noise reduction duct, the duct lengths of which increase sequentially, and the first noise reduction duct, the second noise reduction duct and the third noise reduction duct are arranged in parallel in sequence.

[0032] A switch is provided between the air inlet of the first noise reduction air duct and the air inlet of the second noise reduction air duct, and a switch is provided between the air outlet of the first noise reduction air duct and the air outlet of the second noise reduction air duct. By toggling the switch between the first and second noise reduction air ducts, only the first noise reduction air duct is closed and the second noise reduction air duct is opened, allowing air to pass through the second noise reduction air duct; or by toggling the switch between the first and second noise reduction air ducts, only the second noise reduction air duct is closed and the first noise reduction air duct is opened, allowing air to pass through the first noise reduction air duct.

[0033] A switch is provided between the air inlet of the second noise reduction air duct and the air inlet of the third noise reduction air duct, and a switch is provided between the air outlet of the second noise reduction air duct and the air outlet of the third noise reduction air duct. By toggling the switch between the second and third noise reduction air ducts, only the second noise reduction air duct is closed and the third noise reduction air duct is opened, allowing air to pass through the third noise reduction air duct; or by toggling the switch between the second and third noise reduction air ducts, only the third noise reduction air duct is closed and the second noise reduction air duct is opened, allowing air to pass through the second noise reduction air duct.

[0034] In one embodiment, the shape of the first air duct is any one of a straight line shape, an arc shape or a bent shape, and the shape of the noise reduction air duct is any one of a straight line shape, an arc shape or a bent shape. The specific shape of the air duct is designed according to the internal structure of the terminal device, and is not limited in the embodiment of this application.

[0035] Based on the same technical concept, the embodiment of the present application also proposes a noise reduction method for a fan in a terminal, as shown in FIG2 , the method comprising:

[0036] Step 201: Obtain the current gear position at the fan outlet.

[0037] Among them, different gears correspond to different wind speeds.

[0038] A fan for heat dissipation is provided inside the terminal. Different gears of the fan correspond to different wind speeds. The terminal obtains the current gear at the fan outlet.

[0039] Step 202: Based on a preset mapping relationship, the target noise reduction air duct corresponding to the current gear position is turned on by controlling the switch.

[0040] Among them, the preset mapping relationship indicates that different gears correspond to noise reduction air ducts of different lengths.

[0041] The terminal obtains the wind noise frequency of the wind speed corresponding to the current gear at the fan outlet, and then determines the wind noise wavelength of the wind speed based on the preset coefficient u and the wind noise frequency. The calculation formula for the wind noise wavelength is λ=u / f, where λ is the wind noise wavelength, u is the wave speed, and f is the wind noise frequency.

[0042] Since the same wind at the fan outlet flows through the first air duct and the noise reduction air duct, the wind noise frequency and wind noise wavelength of the first air duct and the noise reduction air duct are the same.

[0043] The terminal determines the duct length of the noise reduction duct according to the wind noise wavelength and the duct length of the first duct, thereby ensuring that the duct length of the noise reduction duct differs from the duct length of the first duct by nL+L / 2, where n is a natural number, L is the wind noise wavelength,

[0044] In this way, the terminal obtains the duct length of the noise reduction air duct corresponding to the current gear. The above operation is performed for each gear of the fan to obtain the duct length of the noise reduction air duct corresponding to each gear, thereby establishing a mapping relationship between the fan gear and the duct length of the noise reduction air duct, and saving the mapping relationship.

[0045] After the fan is turned on, the terminal determines the target noise reduction air duct corresponding to the current gear of the fan according to the preset mapping relationship, and turns on the target noise reduction air duct through the control switch, so that only the first air duct and the target noise reduction air duct are turned on, and other noise reduction air ducts are closed.

[0046] Step 203: The air at the fan outlet is delivered to the terminal outlet through a first air duct and a target noise reduction air duct of fixed length, so that the waveforms of the wind noise generated by the first air duct and the target noise reduction air duct at the terminal outlet are consistent, and the phase difference of the waveforms is m 180 degrees, where m is a positive integer.

[0047] The fan's air outlet is divided into two paths. One path passes through the first air duct of fixed length from the fan outlet to the terminal outlet, and the other path passes through the target noise reduction air duct from the fan outlet to the terminal outlet. The waveforms of the wind noise generated by the two paths of wind at the terminal outlet are consistent, and the phase difference of the waveforms is m 180°. The wind noises cancel each other out, and finally the wind noise heard at the terminal outlet is reduced.

[0048] The embodiment of the present application sets noise reduction air ducts of different lengths corresponding to each gear position of the fan, and can open the corresponding target noise reduction air duct according to the current gear position, thereby dividing the same wind into two paths, so that the wind reaches the terminal air outlet from the first air duct and the target noise reduction air duct respectively, forming a waveform with the same waveform and a waveform phase difference of m 180° at the terminal air outlet, so that the two winds offset the wind noise and reduce the wind noise.

[0049] Exemplarily, the gears include a first gear, a second gear, and a third gear whose corresponding wind speeds decrease in sequence, and the noise reduction air duct includes a first noise reduction air duct, a second noise reduction air duct, and a third noise reduction air duct whose air duct lengths increase in sequence. Based on a preset mapping relationship, opening the target noise reduction air duct corresponding to the current gear by controlling the switch includes the following three embodiments.

[0050] In a first embodiment, when it is detected that the current gear position is the first gear position, the second noise reduction air duct and the third noise reduction air duct are closed by controlling the switch, and the first noise reduction air duct is opened.

[0051] In the second embodiment, when it is detected that the current gear position is the second gear position, the first noise reduction air duct and the third noise reduction air duct are closed by controlling the switch, and the second noise reduction air duct is opened.

[0052] In a third embodiment, when it is detected that the current gear position is the third gear position, the first noise reduction air duct and the second noise reduction air duct are closed by controlling the switch, and the third noise reduction air duct is opened.

[0053] The embodiment of the present application is explained in detail below with reference to FIG1 .

[0054] The fan has three speed settings: high, medium, and low. Encased in an external structure, the fan generates air that originates only at the fan outlet and flows through the duct in a fixed direction toward the terminal outlet. The left side below the fan houses the first air duct, which flows in the normal direction, while the right side houses noise reduction ducts ①, ②, and ③. The noise reduction ducts have two switches, one above and one below, that can be turned horizontally and vertically to enable or disable different noise reduction channels.

[0055] When the fan is rotating at high speed, the corresponding wind speed is A1, generating the highest wind noise frequency (f1). The wavelength of the wind noise waveform is L1, the shortest wavelength, and the period is T1. Therefore, the noise reduction flow flows through the shortest noise reduction duct ① to the terminal outlet. At this time, it is necessary to turn duct switch 1 to the vertical upward direction and duct switch 4 to the vertical downward direction to close noise reduction duct ③. Turn duct switch 2 to the vertical upward direction and duct switch 3 to the vertical downward direction to close noise reduction duct ②, ensuring that air flows from noise reduction duct ① to the terminal outlet. The air flowing from noise reduction duct ① to the terminal outlet arrives at the terminal outlet after nT1 + T1 / 2 of the time that the air from the first duct arrives at the terminal outlet. Therefore, the wind noise waveforms reaching the outlet through the two ducts are essentially consistent, with a phase difference of m times 180 degrees. The wind noise generated by the two winds cancels each other out, achieving the wind noise reduction function.

[0056] When the fan is operating at medium speed, the corresponding wind speed is A2, generating wind noise at a frequency of f2. The wavelength of the wind noise waveform is L2, which is medium, with a period of T2. Therefore, the noise-reducing airflow flows through the medium-length noise-reducing duct ② to the terminal outlet. At this time, turn duct switch 1 vertically upward and duct switch 4 vertically downward to close noise-reducing duct ③. Turn duct switch 2 horizontally to the left and duct switch 3 horizontally to the left to close noise-reducing duct ①, ensuring that air flows from noise-reducing duct ② to the terminal outlet. The air flowing from noise-reducing duct ② to the terminal outlet arrives at the terminal outlet at a time nT2 + T2 / 2 later than the air flowing normally to the duct. Therefore, the wind noise waveforms reaching the terminal outlet through the two ducts are essentially consistent, with a phase difference of m times 180°. The noise generated by the two winds cancels each other out, achieving wind noise reduction.

[0057] When the fan is operating at low speed, the corresponding wind speed is A3, generating a wind noise frequency of f3. The wind noise waveform has a wavelength of L3, a maximum wavelength, and a period of T3. Therefore, the noise reduction flow is directed through the longest noise reduction duct ③ to the terminal outlet. At this time, it is necessary to turn duct switch 1 to the horizontal left and duct switch 4 to the horizontal left, closing noise reduction duct ② and ensuring that air flows from noise reduction duct ③ to the terminal outlet. The air flowing from noise reduction duct ③ to the terminal outlet arrives at the terminal outlet nT3 + T3 / 2 later than the air flowing normally to the duct. Therefore, the wind noise waveforms reaching the terminal outlet through the two ducts are essentially consistent, with a phase difference of m 180°. The wind noise generated by the two winds cancels each other out, achieving wind noise reduction.

[0058] FIG3 is a schematic diagram of the air duct opening control flow at three fan gear positions.

[0059] Compared with the prior art, the embodiment of the present application does not use MIC and speakers for active noise reduction, and does not require the addition of MIC and speakers and other auxiliary circuits, so the cost will not increase significantly. At the same time, no MIC and speakers are added inside the mobile phone, which will not interfere with the antenna and RF indicators and will not increase the design difficulty.

[0060] Based on the same technical concept, an embodiment of the present application provides a noise reduction device for a fan in a terminal, as shown in Figure 4, the device includes: an acquisition module 401, used to obtain the current gear at the fan outlet, wherein different gears correspond to different wind speeds; an opening module 402, used to open the target noise reduction air duct corresponding to the current gear by controlling the switch based on a preset mapping relationship, wherein the preset mapping relationship indicates that different gears correspond to noise reduction air ducts of different lengths; a transmission module 403, used to send the air outlet at the fan outlet to the terminal outlet through a first air duct and a target noise reduction air duct of fixed length, so that the waveforms of the wind noise generated by the first air duct and the target noise reduction air duct at the terminal outlet are consistent, and the waveform phase difference is m 180°, wherein m is a positive integer.

[0061] In one embodiment, the start module 402 is used to: determine the wind noise frequency of the wind speed corresponding to the current gear at the fan outlet; determine the wind noise wavelength of the wind speed based on a preset coefficient and the wind noise frequency; determine the duct length of the noise reduction duct based on the wind noise wavelength and the duct length of the first duct, wherein the duct length of the noise reduction duct differs from the duct length of the first duct by nL+L / 2, wherein n is a natural number and L is the wind noise wavelength; establish a mapping relationship between the gear position and the duct length of the noise reduction duct.

[0062] In one embodiment, the gear positions include a first gear position, a second gear position, and a third gear position whose corresponding wind speeds decrease in sequence, and the noise reduction air duct includes a first noise reduction air duct, a second noise reduction air duct, and a third noise reduction air duct whose air duct lengths increase in sequence. The opening module 402 is used to: when it is detected that the current gear position is the first gear position, close the second noise reduction air duct and the third noise reduction air duct by controlling the switch, and open the first noise reduction air duct; or, when it is detected that the current gear position is the second gear position, close the first noise reduction air duct and the third noise reduction air duct by controlling the switch, and open the second noise reduction air duct; or, when it is detected that the current gear position is the third gear position, close the first noise reduction air duct and the second noise reduction air duct by controlling the switch, and open the third noise reduction air duct.

[0063] As shown in Figure 5, an embodiment of the present application provides an air conditioner control device, including a processor 501, a communication interface 502, a memory 503 and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other through the communication bus 504.

[0064] The memory 503 is used to store computer programs.

[0065] In one embodiment of the present application, the processor 501 is configured to implement the fan noise reduction method in the terminal provided by any one of the aforementioned method embodiments when executing the program stored in the memory 503 .

[0066] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for reducing noise of a fan in a terminal provided in any of the aforementioned method embodiments are implemented.

[0067] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0068] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course, by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the relevant technology, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiment.

[0069] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0070] The foregoing is merely a detailed description of the embodiments of the present application, which will enable those skilled in the art to understand or implement the embodiments of the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features of the present application.

Claims

1. A noise reduction device for a fan in a terminal, wherein: The noise reduction device comprises: a first air duct, at least one noise reduction air duct and a switch combination; One end of the first air duct is connected to the fan air outlet, and the other end of the first air duct is connected to the terminal air outlet; One end of the noise reduction air duct is connected to the fan air outlet, and the other end of the noise reduction air duct is connected to the terminal air outlet; The switches in the switch combination are arranged at the air inlet and the air outlet of the noise reduction air duct, and the switch combination is used to control the opening or closing of the noise reduction air duct; The difference in air duct length between the first air duct and the noise reduction air duct is nL+L / 2, where n is a natural number and L is the wavelength of wind noise at the fan outlet.

2. The noise reduction device according to claim 1, wherein: The same switch is used between the air inlets or air outlets of two adjacent noise reduction air ducts, and the switch is used to open one noise reduction air duct while closing the other noise reduction air duct.

3. The noise reduction device according to claim 1, wherein: Each air inlet or air outlet of the noise reduction air duct is provided with a switch, and the switch is used to open or close the noise reduction air duct.

4. The noise reduction device according to claim 2, wherein: The noise reduction device comprises a first noise reduction air duct, a second noise reduction air duct and a third noise reduction air duct with increasing air duct lengths in sequence; The first noise reduction air duct, the second noise reduction air duct and the third noise reduction air duct are arranged in parallel in sequence; A switch is provided between the air inlet of the first noise reduction air duct and the air inlet of the second noise reduction air duct, and a switch is provided between the air inlet of the second noise reduction air duct and the air inlet of the third noise reduction air duct; A switch is provided between the air outlet of the first noise reduction air duct and the air outlet of the second noise reduction air duct, and a switch is provided between the air outlet of the second noise reduction air duct and the air outlet of the third noise reduction air duct.

5. The noise reduction device according to claim 1, wherein: The first air duct and / or the noise reduction air duct has a straight line shape, an arc shape or a bent shape.

6. A method for reducing noise of a fan in a terminal, wherein: The method comprises: Get the current gear position at the fan outlet, where different gear positions correspond to different wind speeds; Based on a preset mapping relationship, the target noise reduction air duct corresponding to the current gear position is turned on by controlling the switch, wherein the preset mapping relationship indicates that different gear positions correspond to noise reduction air ducts of different lengths; The air outlet at the fan outlet is delivered to the terminal outlet through a first air duct of a fixed length and the target noise reduction air duct, so that the waveforms of the wind noise generated by the first air duct and the target noise reduction air duct at the terminal outlet are consistent, and the waveform phase difference is m 180°, where m is a positive integer.

7. The method according to claim 6, wherein: Based on the preset mapping relationship, the target noise reduction air duct corresponding to the current gear position is turned on by controlling the switch, and the method further includes: Determine the wind noise frequency of the fan at the current gear corresponding to the wind speed at the fan outlet; Determining the wind noise wavelength of the wind speed according to a preset coefficient and the wind noise frequency; Determine the length of the noise reduction duct according to the wind noise wavelength and the length of the first duct, wherein the difference between the length of the noise reduction duct and the length of the first duct is nL+L / 2, wherein n is a natural number and L is the wind noise wavelength; A mapping relationship between the gear position and the air duct length of the noise reduction air duct is established.

8. The method according to claim 6, wherein: The gears include a first gear, a second gear, and a third gear corresponding to successively decreasing wind speeds, the noise reduction air duct includes a first noise reduction air duct, a second noise reduction air duct, and a third noise reduction air duct whose air duct lengths successively increase, and based on the preset mapping relationship, opening the target noise reduction air duct corresponding to the current gear by controlling the switch includes: When it is detected that the current gear position is the first gear position, the second noise reduction air duct and the third noise reduction air duct are closed by controlling the switch, and the first noise reduction air duct is opened; or, When it is detected that the current gear position is the second gear position, the first noise reduction air duct and the third noise reduction air duct are closed by controlling the switch, and the second noise reduction air duct is opened; or, When it is detected that the current gear position is the third gear position, the first noise reduction air duct and the second noise reduction air duct are closed by controlling the switch, and the third noise reduction air duct is opened.

9. An electronic device, wherein: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, for implementing any of the methods described in claims 6-8 when executing a program stored in a memory.

10. A computer-readable storage medium, wherein: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 6 to 8 is implemented.

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