Active noise reduction system and control method thereof, household appliance and electronic equipment

Abstract

The invention provides an active noise reduction system and a control method thereof, a household appliance and electronic equipment. The control method comprises the following steps: acquiring an interference degree on a noise reduction effect in an installation environment of the active noise reduction system; determining a target angle matched with the interference degree; and controlling the loudspeaker to rotate by the target angle so as to reduce the interference degree of the installation environment on the noise reduction effect. The loudspeaker is controlled to rotate by the target angle matched with the interference degree according to the interference degree of the installation environment of the active noise reduction system on the noise reduction effect, and the interference degree of the installation environment on the noise reduction effect is reduced by changing the orientation of the loudspeaker, so that the interference of the installation environment on the active noise reduction system is reduced, and the active noise reduction effect is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of active noise reduction, and in particular to an active noise reduction system and a control method thereof, a household appliance, and an electronic device. Background Art

[0002] Active noise reduction is a noise control technology that can effectively reduce low-frequency noise levels. As a gradually mature technology, it has been applied to various home appliances. However, the noise reduction effect of active noise reduction systems still needs to be improved. Summary of the invention

[0003] The present disclosure provides an active noise reduction system and a control method thereof, a household appliance, and an electronic device, which can reduce environmental interference to the active noise reduction system and improve the active noise reduction effect.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] In a first aspect, a control method of an active noise reduction system is provided, wherein the active noise reduction system includes a speaker, and the control method includes:

[0006] Obtaining the interference degree of the active noise reduction system in the installation environment to the noise reduction effect;

[0007] determining a target angle that matches the interference level;

[0008] The loudspeaker is controlled to rotate to the target angle to reduce the interference degree of the installation environment on the noise reduction effect.

[0009] Optionally, the active noise reduction system is applied to a household appliance, the household appliance includes a fan; the interference degree is characterized according to airflow information of an airflow generated by the fan; and determining a target angle matching the interference degree includes:

[0010] Determine a target angle that matches the airflow information; wherein the size of the target angle is positively correlated with the wind speed and / or wind volume contained in the airflow information; and / or the direction of the target angle is toward the direction of the fan that generates the airflow.

[0011] Optionally,

[0012] Determining a target angle that matches the airflow information includes: in response to the wind speed being greater than or equal to a wind speed threshold, determining a target angle that matches the airflow information;

[0013] And / or, controlling the speaker to rotate to the target angle includes: controlling the paper cone of the speaker to rotate toward the direction of the noise source.

[0014] Optionally, the active noise reduction system further includes a reference microphone; and controlling the speaker to rotate to the target angle includes:

[0015] Determining a compensation angle that matches a change in a noise signal collected by the reference microphone;

[0016] The target angle is compensated according to the compensation angle, and the speaker is controlled to rotate to the compensated target angle.

[0017] Optionally, determining a compensation angle that matches a change in a noise signal collected by the reference microphone includes:

[0018] In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining the compensation angle; wherein the first noise signal and the second noise signal are both noise signals collected when the active noise reduction system and the home appliance to which the active noise reduction system is applied are started, and the collection time of the first noise signal is earlier than the collection time of the second noise signal;

[0019] And / or, the size of the compensation angle is positively correlated with the coherence; the direction of the compensation angle is a direction away from the fan generating the airflow.

[0020] Optionally, the active noise reduction system further includes a reference microphone; the interference degree is characterized according to a change in a noise signal collected by the reference microphone;

[0021] Determine a target angle that matches the level of interference, including:

[0022] In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining a target angle that matches the change; wherein the first noise signal is a noise signal collected by the reference microphone when the active noise reduction system is started, and the second noise signal is a noise signal currently collected by the reference microphone;

[0023] And / or, controlling the speaker to rotate to the target angle includes: controlling the paper cone of the speaker to rotate in a direction away from the noise source; the size of the target angle is positively correlated with the coherence.

[0024] In a second aspect, an active noise reduction system is provided, comprising: a speaker, a microphone and a processor; the processor is electrically connected to the speaker and the microphone respectively;

[0025] When the processor executes the computer program, the control method of the active noise reduction system according to any one of the first aspects is implemented.

[0026] According to a third aspect, a household appliance is provided, wherein the household appliance comprises the active noise reduction system according to any one of the second aspects.

[0027] Optionally, the household appliance includes a range hood; and the active noise reduction system is arranged in a flue of the range hood.

[0028] In a fourth aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, wherein when the processor executes the computer program, the control method of the active noise reduction system described in any one of the first aspects is implemented.

[0029] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0030] The positive progressive effect of the present disclosure is that the present disclosure controls the rotation of the speaker to a target angle that matches the degree of interference of the installation environment of the active noise reduction system on the noise reduction effect, and reduces the degree of interference of the installation environment on the noise reduction effect by changing the orientation of the speaker, thereby reducing the interference of the installation environment on the active noise reduction system and improving the active noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a control method of an active noise reduction system provided by an exemplary embodiment of the present disclosure;

[0032] Figure 2 A schematic diagram of an application scenario of a control method for an active noise reduction system provided by an exemplary embodiment of the present disclosure;

[0033] Figure 3 The present invention provides a schematic structural diagram of an electronic device according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0035] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0036] An active noise reduction system usually includes components such as microphones and speakers. During the active noise reduction process, the speaker plays a noise reduction signal with the same amplitude and opposite phase as the noise signal emitted by the noise source, so that the noise reduction signal cancels out the noise signal and achieves the effect of noise reduction. In order to ensure the noise reduction effect, the active noise reduction system may include multiple microphones and speakers, and the number of microphones and speakers can be set according to actual conditions.

[0037] According to research, the noise reduction effect of the active noise reduction system will be affected by the layout of the microphone and the speaker, and will also be interfered by the installation environment of the active noise reduction system. Based on this, the embodiment of the present disclosure provides a control method for the active noise reduction system, which reduces the interference of the installation environment on the active noise reduction system by adjusting the direction of the speaker, and improves the active noise reduction effect.

[0038] Figure 1 A flowchart of a control method of an active noise reduction system provided by an exemplary embodiment of the present disclosure, the control method comprising the following steps:

[0039] Step 101: Obtain the interference degree of the installation environment of the active noise reduction system on the noise reduction effect.

[0040] The impact of the installation environment on the noise reduction effect includes the impact of the airflow information of the airflow in the installation environment on the speaker and microphone, and the impact of the oil smoke in the installation environment on the speaker and microphone. The interference degree is related to the airflow information and can be characterized by the airflow information. The interference degree can also be characterized by the change of the noise signal collected by the reference microphone. The reference microphone is deployed near the noise source to collect the noise signal near the noise source.

[0041] Step 102: Determine a target angle that matches the interference level.

[0042] In one embodiment, a correspondence between the interference degree and the angle may be established, and a target angle matching the interference degree of the current installation environment on the noise reduction effect may be determined according to the correspondence.

[0043] The corresponding relationship can be determined by historical data and / or experimental data of the active noise reduction system, and the historical data and / or experimental data include parameters such as interference degree and angle. The corresponding relationship can be represented by a table, a function, or a model. In this regard, the embodiments of the present disclosure are not particularly limited.

[0044] Step 103: Control the loudspeaker to rotate to a target angle to reduce the interference of the installation environment on the noise reduction effect.

[0045] In this embodiment, the speaker can be installed in the home appliance through a rotatable mechanical structure, and the angle rotation of the speaker can be achieved by controlling the mechanical structure to reduce the interference of the installation environment on the noise reduction effect. The mechanical structure can be referred to the relevant technical description, which will not be repeated here.

[0046] It should be noted that the number of speakers included in the active noise reduction system may be one or more. When the active noise reduction system includes multiple speakers, each speaker may be controlled independently or together, which is not particularly limited in the embodiments of the present disclosure.

[0047] In this embodiment, according to the interference degree of the installation environment of the active noise reduction system on the noise reduction effect, the speaker is controlled to rotate to a target angle that matches the interference degree. By changing the orientation of the speaker, the interference degree of the installation environment on the noise reduction effect is reduced, thereby reducing the interference of the installation environment on the active noise reduction system and improving the active noise reduction effect.

[0048] In one embodiment, the interference level is characterized according to airflow information of airflow in the installation environment. Step 102 includes: determining a target angle that matches the airflow information.

[0049] See also Figure 2 Taking the active noise reduction system applied to a range hood as an example, the airflow information of the airflow in the installation environment is also the airflow information of the airflow in the flue of the range hood. The study found that the airflow will impact the speaker of the active noise reduction system, thereby affecting the noise reduction effect of the active noise reduction system.

[0050] In this embodiment, the target angle is determined according to the airflow information of the airflow in the installation environment, and then the speaker is controlled to rotate to the target angle to reduce the impact of the airflow on the speaker, thereby improving the noise reduction effect of the active noise reduction system. In addition, by adjusting the direction of the speaker, the oil smoke attached to the speaker can be reduced, thereby further improving the active noise reduction effect.

[0051] In one embodiment, the airflow information includes wind speed. The step of determining a target angle matching the airflow information includes: in response to the wind speed V being greater than or equal to a wind speed threshold V0, determining a target angle matching the airflow information.

[0052] The wind speed threshold V0 may be set according to actual conditions. The wind speed may be acquired by, but is not limited to, a wind speed sensor, which is deployed near the speaker, for example, in the area below the speaker.

[0053] If the wind speed V is greater than or equal to the wind speed threshold V0, it means that the wind speed is relatively high, the airflow has a greater impact on the active noise reduction system, and the oil stains will adhere to the speaker more severely. In this scenario, controlling the speaker to rotate to the target angle can effectively reduce the impact of the airflow on the speaker and reduce the degree of oil smoke adhesion. If the wind speed is less than or equal to the wind speed threshold, it means that the airflow has little impact on the active noise reduction system, and there is no need to control the speaker rotation to reduce power consumption.

[0054] In other methods, the size of the target angle is positively correlated with the wind volume contained in the airflow information. The specific implementation method is similar to the wind speed and will not be repeated here.

[0055] In one embodiment, the calculation formula of the target angle can be, but is not limited to, expressed as follows:

[0056] ;

[0057] in, is the initial angle of the speaker, that is, the angle of the speaker before executing step 103. Δ is the target angle. α is the angle of the speaker after executing step 103.

[0058] In one embodiment, the size of the target angle Δ is a fixed angle, and in step 103, the speaker cone is controlled to rotate a fixed angle toward the direction of the fan (the fan is a noise source included in the household appliance) that generates the airflow. The fixed angle is determined based on experience or obtained by fitting historical data. Preferably, the value range of the target angle Δ is [10°, 20°]. Taking the target angle Δ as 10° as an example, in response to the wind speed V being greater than the wind speed threshold V0, the speaker cone is controlled to rotate 10° toward the noise source.

[0059] In one embodiment, the size of the target angle is positively correlated with the wind speed and / or wind volume. The direction of the target angle is away from the fan that generates airflow in the home appliance, that is, in step 103, the speaker cone is controlled to rotate toward the fan.

[0060] The greater the wind speed, the greater the impact on the noise reduction system. The larger the angle of rotation of the speaker should be controlled so that the speaker cone is as close to the fan as possible to achieve the best noise reduction effect.

[0061] Figure 2 In the example of an active noise reduction system including two speakers 21 and three reference microphones 22, in step 103, the two speakers 21 are controlled to rotate toward the fan at the same time. When the fan is located above the active noise reduction system, the paper cones of the two speakers are controlled to rotate upward at a target angle at the same time, so that the paper cones of the speakers are as close to the fan as possible.

[0062] In one embodiment, step 103 specifically includes: determining a compensation angle that matches the change of the noise signal collected by the reference microphone, compensating the target angle according to the compensation angle, and controlling the speaker to rotate to the compensated target angle.

[0063] The change of the noise signal collected by the reference microphone reflects the influence of the acoustic feedback of the speaker on the noise signal. Compensating the target angle based on the compensation angle determined by the change can take into account the negative impact of the acoustic feedback of the speaker to the microphone, thereby further improving the noise reduction effect of the active noise reduction system.

[0064] In one embodiment, the compensation angle is a fixed angle. The fixed angle is determined based on experience or obtained by fitting historical data. The compensation angle is generally smaller than the target angle. Preferably, the compensation angle is 5°.

[0065] In one embodiment, the change is characterized by the coherence of the first noise signal and the second noise signal. The size of the compensation angle is positively correlated with the coherence. The direction of the compensation angle is in the direction away from the fan that generates the airflow in the household appliance. Among them, the first noise signal and the second noise signal are both noise signals collected when the active noise reduction system and the household appliance to which the active noise reduction system is applied are started, and the collection time of the first noise signal is earlier than that of the second noise signal. For example, the first noise signal is a noise signal collected by the reference microphone when the active noise reduction system is just started or a short time after it is started, and the second noise signal is a noise signal collected by the reference microphone at the current moment.

[0066] The smaller the coherence between the first noise signal and the second noise signal, the more the noise signal collected by the reference microphone is affected by the acoustic feedback of the speaker. The target angle is too large and the target angle should be compensated by adjusting the angle of the speaker cone so that the direction of the speaker cone is slightly away from the reference microphone to avoid the speaker cone facing the reference microphone, which will have a negative impact on the acoustic feedback of the speaker.

[0067] In this embodiment, the speaker cone is oriented at a suitable angle through the target angle and the compensation angle. On the one hand, it can reduce the impact of airflow on the speaker in the installation environment, and on the other hand, it can take into account the negative impact of the speaker's acoustic feedback to the microphone, thereby further improving the noise reduction effect of the active noise reduction system.

[0068] In one embodiment, the calculation formula of coherence is as follows:

[0069] ;

[0070] in, is the cross power spectral density of the first noise signal and the second noise signal; and are the auto-power spectral densities of the first noise signal and the second noise signal respectively; γ is the coherence.

[0071] In one embodiment, if the coherence between the first noise signal and the second noise signal is greater than the coherence threshold, it means that the noise signal collected by the reference microphone at the current moment is affected by the acoustic feedback of the speaker, which is negligible compared with the moment when the first noise signal is collected, and there is no need to compensate for the target angle, thereby reducing power consumption. If the coherence between the first noise signal and the second noise signal is less than or equal to the coherence threshold, it means that the noise signal collected by the reference microphone at the current moment is greatly affected by the acoustic feedback of the speaker, and the angle of the speaker needs to be readjusted, then the step of determining the compensation angle is performed, and the target angle is compensated.

[0072] The coherence threshold can be set according to the actual situation. Taking the coherence threshold as 0.6 and the compensation angle as 5° as an example, the compensation formula for the target angle is calculated as follows:

[0073] ;

[0074] Among them, β is the target angle after compensation, and γ is the correlation.

[0075] In one embodiment, the interference level is characterized according to the change of the noise signal collected by the reference microphone. Step 102 includes: determining a target angle that matches the change.

[0076] In one embodiment, the change of noise is characterized by the coherence of a first noise signal and a second noise signal, wherein the first noise signal is a noise signal collected by a reference microphone when the active noise reduction system is started, and the second noise signal is a noise signal currently collected by the reference microphone.

[0077] The step of determining a target angle that matches the change includes: in response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining a target angle that matches the coherence. The coherence threshold can be set according to actual conditions.

[0078] If the coherence between the first noise signal and the second noise signal is greater than the coherence threshold, it means that the noise signal collected by the reference microphone at the current moment is affected by the acoustic feedback of the speaker, which is negligible compared with the moment when the first noise signal is collected, and there is no need to adjust the angle of the speaker, thereby reducing power consumption. If the coherence between the first noise signal and the second noise signal is less than or equal to the coherence threshold, it means that the noise signal collected by the reference microphone at the current moment is greatly affected by the acoustic feedback of the speaker, and the rotation angle of the speaker needs to be readjusted, then the step of determining the target angle that matches the change of the noise signal collected by the reference microphone is executed, or the step of determining the compensation angle is executed.

[0079] Corresponding to the above-mentioned control method embodiment of the active noise reduction system, the present disclosure also provides an embodiment of a control device of the active noise reduction system. The control device is used to implement the control method provided in any of the above-mentioned embodiments, and the control device includes:

[0080] An acquisition module, used to acquire the interference degree of the active noise reduction system in the installation environment on the noise reduction effect;

[0081] A determination module, used to determine a target angle that matches the interference level;

[0082] The control module is used to control the speaker to rotate to the target angle to reduce the interference degree of the installation environment on the noise reduction effect.

[0083] Optionally, the active noise reduction system is applied to a household appliance, and the household appliance includes a fan; the interference degree is characterized according to airflow information of the airflow generated by the fan; and the determination module is specifically used for:

[0084] Determine a target angle that matches the airflow information; wherein the size of the target angle is positively correlated with the wind speed and / or wind volume contained in the airflow information; and / or the direction of the target angle is toward the direction of the fan that generates the airflow.

[0085] Optionally, the determination module is specifically configured to: in response to the wind speed being greater than or equal to a wind speed threshold, determine a target angle that matches the airflow information;

[0086] Optionally, the control module is specifically used to control the paper cone of the speaker to rotate toward the direction of the noise source.

[0087] Optionally, the active noise reduction system further includes a reference microphone; and the control module is specifically configured to:

[0088] Determining a compensation angle that matches a change in a noise signal collected by the reference microphone;

[0089] The target angle is compensated according to the compensation angle, and the speaker is controlled to rotate to the compensated target angle.

[0090] Optionally, when determining a compensation angle that matches a change in a noise signal collected by the reference microphone, the control module is used to:

[0091] In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining the compensation angle; wherein the first noise signal and the second noise signal are both noise signals collected when the active noise reduction system and the home appliance to which the active noise reduction system is applied are started, and the collection time of the first noise signal is earlier than the collection time of the second noise signal;

[0092] Optionally, the size of the compensation angle is positively correlated with the coherence; and the direction of the compensation angle is a direction away from a fan generating the airflow.

[0093] Optionally, the active noise reduction system further includes a reference microphone; the interference degree is characterized according to a change in a noise signal collected by the reference microphone;

[0094] Determine the module specifically for:

[0095] In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining a target angle that matches the change; wherein the first noise signal is a noise signal collected by the reference microphone when the active noise reduction system is started, and the second noise signal is a noise signal currently collected by the reference microphone;

[0096] Optionally, controlling the speaker to rotate to the target angle includes: controlling a paper cone of the speaker to rotate in a direction away from a noise source; and a size of the target angle is positively correlated with the coherence.

[0097] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only illustrative, wherein the units described as separate components may or may not be physically separated, and the components as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed solution.

[0098] The embodiment of the present disclosure also provides an active noise reduction system, comprising: a speaker, a microphone and a processor; the processor is electrically connected to the speaker and the microphone respectively;

[0099] When the processor executes the computer program, the control method of the active noise reduction system provided by any of the above embodiments is implemented.

[0100] An embodiment of the present disclosure further provides a household appliance, wherein the household appliance includes the active noise reduction system provided by any of the above embodiments.

[0101] Optionally, the household appliance includes a range hood; and the active noise reduction system is arranged in a flue of the range hood.

[0102] Figure 3This is a structural schematic diagram of an electronic device shown in an exemplary embodiment of the present disclosure, the electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor, and when the processor executes the computer program, the control method of the active noise reduction system described in any of the above embodiments is implemented. Figure 3 The electronic device 30 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0103] like Figure 3 As shown, the electronic device 30 may be in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 30 may include, but are not limited to: at least one processor 31, at least one memory 32, and a bus 33 connecting different system components (including the memory 32 and the processor 31).

[0104] The bus 33 includes a data bus, an address bus, and a control bus.

[0105] The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read only memory (ROM) 323 .

[0106] The memory 32 may also include a program tool 325 (or utility) having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0107] The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the control method of the active noise reduction system provided in any of the above embodiments.

[0108] The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboards, pointing devices, etc.). Such communication may be performed via an input / output (I / O) interface 35. Furthermore, the electronic device 30 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 36. As shown, the network adapter 36 communicates with other modules of the electronic device 30 via a bus 33. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.

[0109] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules to be embodied.

[0110] The embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the control method of the active noise reduction system provided in any of the above embodiments is implemented.

[0111] The readable storage medium may include but is not limited to: a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device or any suitable combination of the above.

[0112] The embodiment of the present disclosure further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the control method of the active noise reduction system described in any one of the above items is implemented.

[0113] Among them, the program code for executing the computer program product of the present disclosure can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or completely on the remote device.

[0114] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A control method for an active noise reduction system, characterized in that: The active noise reduction system includes a speaker, and the control method includes: Obtaining the interference degree of the active noise reduction system in the installation environment to the noise reduction effect; determining a target angle that matches the interference level; The loudspeaker is controlled to rotate to the target angle to reduce the interference degree of the installation environment on the noise reduction effect.

2. The control method of the active noise reduction system according to claim 1, characterized in that: The active noise reduction system is applied to a household appliance, wherein the household appliance includes a fan; the interference degree is characterized according to airflow information of an airflow generated by the fan; and determining a target angle matching the interference degree includes: Determine a target angle that matches the airflow information; wherein the size of the target angle is positively correlated with the wind speed and / or wind volume contained in the airflow information; and / or the direction of the target angle is toward the direction of the fan that generates the airflow.

3. The control method of the active noise reduction system according to claim 2, characterized in that: Determining a target angle that matches the airflow information includes: in response to the wind speed being greater than or equal to a wind speed threshold, determining a target angle that matches the airflow information; And / or, controlling the speaker to rotate to the target angle includes: controlling the paper cone of the speaker to rotate toward the direction of the noise source.

4. The control method of the active noise reduction system according to any one of claims 1 to 3, characterized in that: The active noise reduction system further includes a reference microphone; controlling the speaker to rotate to the target angle includes: Determining a compensation angle that matches a change in a noise signal collected by the reference microphone; The target angle is compensated according to the compensation angle, and the speaker is controlled to rotate to the compensated target angle.

5. The control method of the active noise reduction system according to claim 4, characterized in that: Determining a compensation angle that matches a change in a noise signal collected by the reference microphone includes: In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining the compensation angle; wherein the first noise signal and the second noise signal are both noise signals collected when the active noise reduction system and the home appliance to which the active noise reduction system is applied are started, and the collection time of the first noise signal is earlier than the collection time of the second noise signal; And / or, the size of the compensation angle is positively correlated with the coherence; the direction of the compensation angle is a direction away from the fan generating the airflow.

6. The control method of the active noise reduction system according to any one of claims 1 to 3, characterized in that: The active noise reduction system also includes a reference microphone; the interference degree is characterized according to the change of the noise signal collected by the reference microphone; Determine a target angle that matches the level of interference, including: In response to the coherence of the first noise signal and the second noise signal being less than or equal to a coherence threshold, determining a target angle that matches the change; wherein the first noise signal is a noise signal collected by the reference microphone when the active noise reduction system is started, and the second noise signal is a noise signal currently collected by the reference microphone; And / or, controlling the speaker to rotate to the target angle includes: controlling the paper cone of the speaker to rotate in a direction away from the noise source; the size of the target angle is positively correlated with the coherence.

7. An active noise reduction system, characterized in that: include: Speakers, microphones, and processors; The processor is electrically connected to the speaker and the microphone respectively; When the processor executes the computer program, the control method of the active noise reduction system according to any one of claims 1 to 6 is implemented.

8. A household appliance, characterized in that: The household appliance includes the active noise reduction system according to claim 7.

9. The household appliance according to claim 8, characterized in that: The household appliance includes a range hood; the active noise reduction system is arranged in the flue of the range hood.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and used to run on the processor, characterized in that: When the processor executes the computer program, the control method of the active noise reduction system according to any one of claims 1 to 6 is implemented.

Images