Range hood and active noise reduction method, device and computer readable storage medium thereof

Abstract

The application discloses an extractor hood, an active noise reduction method and device thereof and a computer readable storage medium. The active noise reduction method comprises the following steps: collecting residual noise signals of the extractor hood when the loudspeaker performs active noise reduction on the extractor hood with initial filter parameters, and dividing the residual noise signals into multiple noise segments according to a preset frequency; calculating a sound pressure value corresponding to each noise segment; performing multiple rounds of iterative optimization on the initial filter parameters of the loudspeaker until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than a difference threshold. The noise reduction effect of the loudspeaker is judged by monitoring the change of each noise segment of the residual noise signal, and the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is controlled to be less than the difference threshold. After the noise influence caused by the change of the environment or the working condition, the noise reduction effect after the active noise reduction can also be ensured to be stable at the expected level.

Description

Technical Field

[0001] This invention relates to the field of range hoods, and more particularly to a range hood and its active noise reduction method, device, and computer-readable storage medium. Background Technology

[0002] As an essential kitchen appliance, the range hood works by using a motor to drive an impeller to rotate within a volute, creating negative pressure that draws away cooking fumes and expels them outdoors. However, range hoods often generate noise during operation, affecting the user experience.

[0003] To improve the noise reduction effect of range hoods, various manufacturers have tried to add noise reduction devices to reduce the noise generated during the operation of the range hood. However, most range hoods cannot adjust the filter parameters of the speakers according to the influence of environmental noise. As a result, when the external environment or the operating conditions of the range hood change and the noise changes, the noise reduction effect cannot reach the expected level, which affects the user experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the noise reduction effect cannot reach the expected level when the external environment or the operating conditions of the range hood change and the noise changes. The present invention provides a range hood and its active noise reduction method, device and computer-readable storage medium.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An active noise reduction method for a range hood, the active noise reduction method comprising:

[0007] The residual noise signal of the range hood is collected when the speaker performs active noise reduction on the range hood with initial filtering parameters, and the residual noise signal is divided into multiple noise segments according to a preset frequency.

[0008] Calculate the sound pressure level for each noise segment;

[0009] The initial filtering parameters of the loudspeaker are iteratively optimized in multiple rounds until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold.

[0010] Optionally, before performing multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker, the following steps are included:

[0011] Determine whether the difference between the sound pressure value corresponding to each noise segment and the target sound pressure value of the same noise segment is less than a difference threshold;

[0012] If the determination is negative, then the step of performing multiple rounds of iterative optimization on the initial filtering parameters of the speaker is executed;

[0013] If the determination is yes, then control the speaker to actively reduce noise on the range hood using the initial filtering parameters.

[0014] Optionally, before performing multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker, the following steps are included:

[0015] Determine whether the motor speed of the range hood is greater than a speed threshold, and if so, perform a multi-round iterative optimization of the initial filtering parameters of the speaker.

[0016] And / or, determine whether the ambient noise level within a preset range of the range hood is greater than a noise level threshold, and if so, perform multiple iterations of the initial filtering parameters for the speaker.

[0017] Optionally, the step of performing multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker includes:

[0018] For a noise segment whose sound pressure value is greater than the target sound pressure value of the same noise segment, the initial filtering parameters of the loudspeaker are optimized until the sound pressure value of the noise segment is less than or equal to the target sound pressure value of the same noise segment.

[0019] Optionally, the initial filtering parameters are the filtering parameters of the speaker when each noise segment is at its minimum during the last active noise reduction process of the speaker for the range hood; the target sound pressure value is the minimum sound pressure value that each noise segment can reach during the last active noise reduction process of the speaker for the range hood.

[0020] Alternatively, the initial filtering parameters and the target sound pressure level are determined based on experimental data, which includes the filtering parameters of the loudspeaker when the loudspeaker performs active noise reduction on the range hood, and the minimum sound pressure level that the loudspeaker can achieve in each noise segment during the active noise reduction process of the range hood.

[0021] An active noise reduction device for a range hood, the active noise reduction device comprising:

[0022] The acquisition module is used to acquire the residual noise signal of the range hood when the speaker performs active noise reduction on the range hood with initial filtering parameters, and to divide the residual noise signal into multiple noise segments according to a preset frequency.

[0023] The calculation module is used to calculate the sound pressure value corresponding to each noise segment;

[0024] The optimization module is used to perform multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold.

[0025] Optionally, prior to the optimization module, the active noise reduction device includes:

[0026] The first judgment module is used to determine whether the difference between the sound pressure value corresponding to each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold; if the judgment is no, the optimization module is executed; if the judgment is yes, the noise reduction module is executed.

[0027] The noise reduction module is used to control the speaker to actively reduce noise in the range hood using the initial filtering parameters.

[0028] Optionally, prior to the optimization module, the active noise reduction device includes:

[0029] The second judgment module is used to determine whether the motor speed of the range hood is greater than the speed threshold, and execute the optimization module if the determination is yes;

[0030] And / or, a third judgment module is used to determine whether the ambient noise level within a preset range from the range hood is greater than a noise level threshold, and execute the optimization module if the determination is yes.

[0031] Optionally, the optimization module is further configured to:

[0032] For a noise segment whose sound pressure value is greater than the target sound pressure value of the same noise segment, the initial filtering parameters of the loudspeaker are optimized until the sound pressure value of the noise segment is less than or equal to the target sound pressure value of the same noise segment.

[0033] Optionally, the initial filtering parameters are the filtering parameters of the speaker when each noise segment is at its minimum during the last active noise reduction process of the speaker for the range hood; the target sound pressure value is the minimum sound pressure value that each noise segment can reach during the last active noise reduction process of the speaker for the range hood.

[0034] Alternatively, the initial filtering parameters and the target sound pressure level are determined based on experimental data, which includes the filtering parameters of the loudspeaker when the loudspeaker performs active noise reduction on the range hood, and the minimum sound pressure level that the loudspeaker can achieve in each noise segment during the active noise reduction process of the range hood.

[0035] A range hood includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the active noise reduction method for the range hood described above.

[0036] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the active noise reduction method for a range hood as described above.

[0037] The positive and progressive effects of this invention are as follows: This invention judges the noise reduction effect of the loudspeaker by monitoring the changes in each noise segment of the residual noise signal, and controls the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment to be less than the difference threshold. Even after the noise is affected by environmental changes or changes in working conditions, it can ensure that the noise reduction effect after active noise reduction is stable at the expected level. Attached Figure Description

[0038] Figure 1 A schematic diagram of the positional relationship of a range hood provided as an exemplary embodiment of the present invention;

[0039] Figure 2 A flowchart illustrating an active noise reduction method for a range hood, provided as an exemplary embodiment of the present invention;

[0040] Figure 3 A block diagram of an active noise reduction device for a range hood provided as an exemplary embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of a range hood provided as an exemplary embodiment of the present invention. Detailed Implementation

[0042] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0043] An exemplary embodiment of the present invention provides an active noise reduction method for a range hood. For details regarding the positional relationship of the range hood, please refer to [link / reference needed]. Figure 1 As shown, the range hood includes a reference microphone 1, a speaker 2, and an error microphone 3. The reference microphone 1 is installed in the airflow channel below the range hood's fan system, the error microphone 3 is installed at the air inlet of the airflow channel, and the speaker is installed between the reference microphone 1 and the error microphone 3. The speaker is used to play a noise reduction signal to actively reduce the noise generated by the range hood.

[0044] See Figure 2 Active noise reduction methods for range hoods include:

[0045] S201. Collect the residual noise signal of the range hood when the speaker performs active noise reduction on the range hood with the initial filtering parameters, and divide the residual noise signal into multiple noise segments according to the preset frequency.

[0046] In one embodiment, the residual noise signal is acquired by the error microphone 3, and the residual noise signal represents the residual signal acquired after active noise reduction by the loudspeaker.

[0047] In one embodiment, the residual noise signal is divided into [h1,h2],[h3,h4],[h5,h6],…,[h...] according to a preset frequency. n-1 ,h n ]wait There are several noise segments, where h represents the frequency of the residual noise signal. The preset frequency can be determined based on the noise signal generated by the range hood. For example, it can be analyzed based on the noise signal generated by the range hood's noise source. The noise signal can be acquired by reference microphone 1, and the frequency with the highest sound pressure level in the noise signal can be set as the preset frequency. Furthermore, during the division of the residual noise signal into noise segments, noise segments with high sound pressure levels or those requiring special attention during noise reduction can be uniformly divided, while other frequency segments can be non-uniformly divided. This improves the efficiency of noise reduction during active noise reduction of each noise segment, ensuring effective noise reduction.

[0048] In one embodiment, the initial filtering parameters can be the speaker's filtering parameters when each noise segment is at its minimum during the last active noise reduction process of the range hood, or the speaker's filtering parameters when each noise segment is at its minimum as determined by the experimental data of the range hood's factory test.

[0049] S202. Calculate the sound pressure value corresponding to each noise segment.

[0050] In one embodiment, the sound pressure level is calculated using the formula: D = 20lg(P / P0), where Lp is the sound pressure level (in decibels), P is the sound pressure level of the corresponding noise segment (in Pascals), and P0 is the reference sound pressure level, P0 = 2 * 10 -5 Pa.

[0051] For each noise segment, the sound pressure level D1, D2, D3, ... is calculated.

[0052] S203. Perform multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold.

[0053] In one embodiment, the target sound pressure level can be the minimum sound pressure level that the speaker can reach in each noise segment during the last active noise reduction process of the range hood, or it can be the minimum sound pressure level that the range hood can reach in each noise segment as determined by the experimental data of the factory test.

[0054] In one embodiment, the initial filtering parameters for the loudspeaker During the multi-round iterative optimization process, optimization is only performed on noise segments with sound pressure levels greater than the target sound pressure level for the same noise segment. This optimization is achieved by controlling the initial filtering parameters of the loudspeaker until the sound pressure level of the noise segment is less than or equal to the target sound pressure level for the same noise segment. The process specifically includes:

[0055] Adjust the speaker's filtering parameters and record the filtering parameters and the corresponding sound pressure value of each noise segment. When the difference between the sound pressure value and the target sound pressure value is less than the difference threshold, it indicates that the noise reduction effect of the corresponding noise segment has reached the expected level. Control the speaker to perform noise reduction with the filtering parameters corresponding to the recorded sound pressure value.

[0056] In one embodiment, prior to step S203, the active noise reduction method further includes:

[0057] Determine whether the difference between the sound pressure level of each noise segment and the target sound pressure level of the same noise segment is less than a difference threshold, i.e., determine... Is it greater than the difference threshold? Wherein, Characterizing the sound pressure level of each noise segment, The target sound pressure level for each noise segment is represented. The difference threshold can be selected according to the actual noise reduction scenario; in this embodiment, the difference threshold is preferably 0.

[0058] If the result is negative, it means that the noise reduction effect of the noise segment has not reached the expected level, and its impact on human ears or the environment is still significant. In this case, the step of performing multiple rounds of iterative optimization on the initial filtering parameters of the speaker will be executed.

[0059] If the judgment is yes, it means that the noise reduction effect of the noise segment has reached the expected level, and the speaker is controlled to actively reduce the noise of the range hood with the initial filtering parameters.

[0060] In one embodiment, prior to step S203, the active noise reduction method further includes:

[0061] Determine if the motor speed of the range hood exceeds the speed threshold;

[0062] If the judgment is yes, it means that the motor speed of the range hood is relatively fast at this time, and the noise it generates has a significant impact on the noise reduction effect of the speaker. The noise reduction effect of the corresponding noise segment has not reached the preset level. Therefore, the initial filtering parameters of the speaker are optimized through multiple rounds of iterations to make the sound pressure value of the corresponding noise segment less than the difference threshold with the target sound pressure value of the same noise segment.

[0063] If the result is negative, it means that the noise generated by the range hood motor has little impact on the noise reduction effect. Therefore, the speaker can continue to be controlled to actively reduce noise from the range hood using the initial filter parameters.

[0064] In one embodiment, prior to step S203, the active noise reduction method further includes:

[0065] Determine whether the ambient noise level within a preset range of the range hood exceeds the noise level threshold;

[0066] If the determination is yes, it means that the ambient noise is relatively high at this time, which has a significant impact on the noise reduction effect of the speaker. The noise reduction effect of the corresponding noise segment has not reached the preset level. Therefore, the initial filtering parameters of the speaker are optimized through multiple rounds of iterations to make the sound pressure value of the corresponding noise segment less than the difference threshold with the target sound pressure value of the same noise segment.

[0067] If the result is negative, it means that the ambient noise has little impact on the noise reduction effect. Therefore, the speaker can continue to be controlled to actively reduce noise from the range hood using the initial filter parameters.

[0068] An exemplary embodiment of the present invention provides an active noise reduction device for a range hood, see [link to example]. Figure 3 The active noise cancellation device includes:

[0069] The acquisition module 31 is used to acquire the residual noise signal of the range hood when the speaker actively reduces noise of the range hood with the initial filtering parameters, and divide the residual noise signal into multiple noise segments according to the preset frequency.

[0070] Calculation module 32 is used to calculate the sound pressure value corresponding to each noise segment;

[0071] The optimization module 33 is used to perform multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold.

[0072] Optionally, prior to optimization module 33, the active noise cancellation device includes:

[0073] The first judgment module is used to determine whether the difference between the sound pressure value corresponding to each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold; if the judgment is no, the optimization module is executed; if the judgment is yes, the noise reduction module is executed.

[0074] The noise reduction module is used to control the speaker to actively reduce noise from the range hood using initial filtering parameters.

[0075] Optionally, prior to optimization module 33, the active noise cancellation device includes:

[0076] The second judgment module is used to determine whether the motor speed of the range hood is greater than the speed threshold, and execute the optimization module if the judgment is yes;

[0077] And / or, the third judgment module is used to determine whether the ambient noise level within a preset range from the range hood is greater than the noise level threshold, and execute the optimization module if the determination is yes.

[0078] Optionally, the optimization module 33 is also used for:

[0079] For noise segments with sound pressure levels greater than the target sound pressure level of the same noise segment, the initial filtering parameters of the loudspeaker are optimized until the sound pressure level of the noise segment is less than or equal to the target sound pressure level of the same noise segment.

[0080] Optionally, the initial filtering parameters are the filtering parameters of the speaker when each noise segment is at its minimum during the last active noise reduction process of the speaker on the range hood; the target sound pressure value is the minimum sound pressure value that each noise segment can reach during the last active noise reduction process of the speaker on the range hood.

[0081] Alternatively, the initial filtering parameters and target sound pressure level can be determined based on experimental data. The experimental data includes the speaker's filtering parameters when the sound pressure level of each noise segment is measured during the active noise reduction process of the speaker on the range hood, as well as the minimum sound pressure level that the speaker can achieve in each noise segment during the active noise reduction process of the speaker on the range hood.

[0082] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative, wherein 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 can be selected to achieve the purpose of the present invention according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0083] An example embodiment of the present invention provides a range hood, see [link to example]. Figure 4 A block diagram is shown of an exemplary range hood 40 suitable for implementing embodiments of the present invention. Figure 4 The range hood 40 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0084] like Figure 4 As shown, the range hood 40 can be represented as a general-purpose computing device, such as a server device. The components of the range hood 40 may include, but are not limited to: at least one processor 41, at least one memory 42, and a bus 43 connecting different system components (including memory 42 and processor 41).

[0085] Bus 43 includes a data bus, an address bus, and a control bus.

[0086] The memory 42 may include volatile memory, such as random access memory (RAM) 421 and / or cache memory 422, and may further include read-only memory (ROM) 423.

[0087] The memory 42 may also include a program tool 425 (or utility) having a set (at least one) program module 424, such program module 424 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0088] The processor 41 performs various functional applications and data processing, such as the methods provided in any of the above embodiments, by running computer programs stored in the memory 42.

[0089] The range hood 40 can also communicate with one or more external devices 44. This communication can be made via input / output (I / O) interface 45. Furthermore, the model-generated range hood 40 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 46. As shown in the figure, network adapter 46 communicates with other modules of the model-generated range hood 40 via bus 43. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model-generated range hood 40, 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.

[0090] It should be noted that although several units / modules or sub-units / modules of the range hood have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, 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 and embodied by multiple units / modules.

[0091] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method provided in any of the above embodiments.

[0092] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0093] In a possible implementation, the present invention can also be implemented as a program product, which includes program code that, when the program product is run on a terminal device, causes the terminal device to execute the method implementing any of the above embodiments.

[0094] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0095] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. An active noise reduction method for a range hood, characterized in that, The active noise reduction method includes: The residual noise signal of the range hood is collected when the speaker performs active noise reduction on the range hood with initial filtering parameters, and the residual noise signal is divided into multiple noise segments according to a preset frequency. Calculate the sound pressure level for each noise segment; Determine whether the motor speed of the range hood is greater than a speed threshold; and / or determine whether the ambient noise level within a preset range of the range hood is greater than a noise level threshold. If the determination is yes, the initial filtering parameters of the loudspeaker are iteratively optimized in multiple rounds until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold. The initial filtering parameters are the filtering parameters of the speaker when each noise segment is at its minimum during the last active noise reduction process of the speaker for the range hood; the target sound pressure value is the minimum sound pressure value reached by each noise segment during the last active noise reduction process of the speaker for the range hood. Alternatively, the initial filtering parameters and the target sound pressure level are determined based on experimental data, which includes the filtering parameters of the loudspeaker when each noise segment is at its minimum during the active noise reduction process of the loudspeaker on the range hood, and the minimum sound pressure level that each noise segment can reach during the active noise reduction process of the loudspeaker on the range hood.

2. The active noise reduction method as described in claim 1, characterized in that, Before performing multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker, the following steps are included: Determine whether the difference between the sound pressure value corresponding to each noise segment and the target sound pressure value of the same noise segment is less than a difference threshold; If the determination is negative, then the step of performing multiple rounds of iterative optimization on the initial filtering parameters of the speaker is executed; If the determination is yes, then control the speaker to actively reduce noise on the range hood using the initial filtering parameters.

3. The active noise reduction method as described in claim 1, characterized in that, The process of performing multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker includes: For a noise segment whose sound pressure value is greater than the target sound pressure value of the same noise segment, the initial filtering parameters of the loudspeaker are optimized until the sound pressure value of the noise segment is less than or equal to the target sound pressure value of the same noise segment.

4. An active noise reduction device for a range hood, characterized in that, The active noise cancellation device includes: The acquisition module is used to acquire the residual noise signal of the range hood when the speaker performs active noise reduction on the range hood with initial filtering parameters, and to divide the residual noise signal into multiple noise segments according to a preset frequency. The calculation module is used to calculate the sound pressure value corresponding to each noise segment; An optimization module is used to perform multiple rounds of iterative optimization on the initial filtering parameters of the loudspeaker until the difference between the sound pressure value of each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold. The second judgment module is used to determine whether the motor speed of the range hood is greater than the speed threshold, and to call the optimization module if the determination is yes; And / or, the third judgment module is used to determine whether the ambient noise volume within a preset range from the range hood is greater than the noise volume threshold, and if the determination is yes, the optimization module is invoked; The initial filtering parameters are the filtering parameters of the speaker when each noise segment is at its minimum during the last active noise reduction process of the speaker for the range hood; the target sound pressure value is the minimum sound pressure value reached by each noise segment during the last active noise reduction process of the speaker for the range hood. Alternatively, the initial filtering parameters and the target sound pressure level are determined based on experimental data, which includes the filtering parameters of the loudspeaker when each noise segment is at its minimum during the active noise reduction process of the loudspeaker on the range hood, and the minimum sound pressure level that each noise segment can reach during the active noise reduction process of the loudspeaker on the range hood.

5. The active noise cancellation device as described in claim 4, characterized in that, Prior to the optimization module, the active noise reduction device includes: The first judgment module is used to determine whether the difference between the sound pressure value corresponding to each noise segment and the target sound pressure value of the same noise segment is less than the difference threshold; if the judgment is no, the optimization module is executed; if the judgment is yes, the noise reduction module is executed. The noise reduction module is used to control the speaker to actively reduce noise in the range hood using the initial filtering parameters.

6. The active noise cancellation device as described in claim 4, characterized in that, The optimization module is also used for: For a noise segment whose sound pressure value is greater than the target sound pressure value of the same noise segment, the initial filtering parameters of the loudspeaker are optimized until the sound pressure value of the noise segment is less than or equal to the target sound pressure value of the same noise segment.

7. A range hood, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the active noise reduction method for the range hood according to any one of claims 1 to 3.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the active noise reduction method for the range hood according to any one of claims 1 to 3.

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