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

Abstract

The application discloses an oil fume exhaust machine and an active noise reduction method, device and computer readable storage medium thereof. The active noise reduction method comprises the following steps: collecting a first noise signal at a first position of the oil fume exhaust machine; controlling a loudspeaker to perform active noise reduction on the first noise signal, collecting a second noise signal at the first position of the oil fume exhaust machine, and the second noise signal is a superimposed noise signal collected in the process of active noise reduction of the loudspeaker; comparing the first noise signal with the second noise signal to determine a noise enhancement area in the second noise signal; and optimizing filter parameters of the loudspeaker based on the noise enhancement area to reduce the noise intensity of the second noise signal in the noise enhancement area. By comparing the first noise signal and the second noise signal collected at the first position of the oil fume exhaust machine, the noise enhancement area of the second noise signal is determined, the filter parameters of the loudspeaker are adjusted, the interference on the first position noise signal is reduced, and the accuracy and precision of the active noise reduction are improved.

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 operation. However, when existing noise reduction devices actively reduce noise signals generated by the noise source of the range hood, the noise reduction signal generated by the device is traced back to the noise source location, affecting the accuracy of the noise signal collected at the noise source location, and thus affecting the result of active noise reduction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect of the prior art in which the noise reduction signal backtracking affects the result of active noise reduction, and to provide 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] Collect the first noise signal at the first position of the range hood;

[0008] The speaker is controlled to actively reduce the noise of the first noise signal, and a second noise signal at the first position of the range hood is collected. The second noise signal is a superimposed noise signal collected during the active noise reduction process of the speaker.

[0009] The first noise signal and the second noise signal are compared to determine the noise enhancement region in the second noise signal;

[0010] The filtering parameters of the loudspeaker are optimized based on the noise enhancement region to reduce the noise intensity of the second noise signal in the noise enhancement region.

[0011] Optionally, comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal includes:

[0012] The signal amplitudes of the first noise signal and the second noise signal are compared, and the frequency region corresponding to the signal amplitude of the second noise signal being greater than that of the first noise signal is determined as the noise enhancement region.

[0013] Optionally, the active noise reduction method further includes:

[0014] The speaker is controlled to perform active noise reduction with optimized filtering parameters.

[0015] Optionally, the number of speakers may be multiple;

[0016] After comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal, the process includes:

[0017] The noise reduction signal of each speaker is compared with the second noise signal to determine the appropriate speaker for the noise enhancement region;

[0018] The filtering parameters of the adjustable loudspeaker are optimized based on the noise enhancement region.

[0019] Optionally, before comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal, the process includes:

[0020] Collect the residual signal at the second position of the range hood;

[0021] Determine whether the residual signal is greater than a preset threshold;

[0022] If so, the filtering parameters of the range hood are optimized based on the residual signal;

[0023] If not, then the step of comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal is performed.

[0024] An active noise reduction device for a range hood, the active noise reduction device comprising:

[0025] The first acquisition module is used to acquire the first noise signal at the first position of the range hood;

[0026] The first noise reduction module is used to control the speaker to actively reduce the noise of the first noise signal and to collect the second noise signal at the first position of the range hood. The second noise signal is the superimposed noise signal collected during the active noise reduction process of the speaker.

[0027] The first determining module is used to compare the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal;

[0028] The first optimization module is used to optimize the filtering parameters of the loudspeaker based on the noise enhancement region, so as to reduce the noise intensity of the second noise signal in the noise enhancement region.

[0029] Optionally, the first determining module is further configured to compare the signal amplitudes of the first noise signal and the second noise signal, and determine the frequency region corresponding to the second noise signal having a signal amplitude greater than that of the first noise signal as the noise enhancement region.

[0030] Optionally, the active noise cancellation device further includes:

[0031] The second noise reduction module is used to control the speaker to perform active noise reduction with optimized filtering parameters.

[0032] Optionally, the number of speakers may be multiple;

[0033] After the first determining module, the active noise reduction device further includes:

[0034] The second determining module is used to compare the noise reduction signal of each speaker with the second noise signal to determine the adjusting speaker corresponding to the noise enhancement area;

[0035] The second optimization module is used to optimize the filtering parameters of the adjustable speaker based on the noise enhancement region.

[0036] Optionally, before the first determining module, the active noise reduction device further includes:

[0037] The second acquisition module is used to acquire the residual signal at the second position of the range hood;

[0038] The judgment module is used to determine whether the residual signal is greater than a preset threshold; if yes, the third optimization module is executed; if no, the first determination module is executed.

[0039] The third optimization module is used to optimize the filtering parameters of the range hood based on the residual signal.

[0040] 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.

[0041] 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.

[0042] The positive and progressive effects of this invention are as follows: This invention compares a first noise signal and a second noise signal collected at a first position of the range hood to confirm whether the noise reduction signal of the range hood has traced back to the first position, causing noise enhancement at the first position. At the same time, it determines the noise enhancement area of ​​the second noise signal and adjusts the filter parameters of the speaker to reduce interference with the noise signal at the first position, thereby improving the accuracy and precision of active noise reduction. Attached Figure Description

[0043] Figure 1 A schematic diagram of the positional relationship of a range hood provided as an exemplary embodiment of the present invention;

[0044] Figure 2 A flowchart illustrating an active noise reduction method for a range hood, provided as an exemplary embodiment of the present invention;

[0045] Figure 3 A block diagram of an active noise reduction device for a range hood provided as an exemplary embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of a range hood provided as an exemplary embodiment of the present invention. Detailed Implementation

[0047] 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.

[0048] 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, one or more speakers 2, and an error microphone 3. The reference microphone 1 is located inside the long duct of the range hood near the fan system and is used to collect noise signals near the noise source, the fan system. The error microphone 3 is located at the air inlet of the long duct of the range hood and is used to collect the residual noise signal after noise reduction by the speakers. The speakers 2 are located between the reference microphone 1 and the error microphone 3 and are used to play noise-reducing signals to actively reduce noise from the noise signal.

[0049] See Figure 2 Active noise reduction methods for range hoods include:

[0050] S201, Collect the first noise signal at the first position of the range hood.

[0051] In one embodiment, the first location is near the fan system of the range hood, preferably within the long duct of the range hood near the fan system. The first noise signal is the noise signal collected by the reference microphone 1 when the fan system of the range hood is started but the speaker 2 is not started. The first noise signal is the noise signal collected near the fan system of the range hood, mainly the noise signal generated by the fan system as the noise source.

[0052] S202. Control the loudspeaker to actively reduce the noise of the first noise signal and collect the second noise signal at the first position of the range hood. The second noise signal is the superimposed noise signal collected during the active noise reduction process of the loudspeaker.

[0053] In one embodiment, the second noise signal is the noise signal collected by the reference microphone 1 when the range hood's fan system starts and the speaker 2 starts. The second noise signal is the noise signal collected near the range hood's fan system, mainly consisting of the noise signal generated by the fan system as a noise source and the noise reduction signal that travels back to the first position after the speaker 2 is turned on.

[0054] S203. Compare the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal.

[0055] In one embodiment, prior to step S203, the active noise reduction method further includes:

[0056] The residual signal of the range hood at the second location is collected; the second location is the air inlet of the long air duct, close to the human body; the residual signal is the residual noise signal of the range hood's fan system after it has been turned on and noise reduced by the speaker 2, and is recorded by the error microphone 3.

[0057] Determine whether the residual signal is greater than a preset threshold; if yes, it means that the noise reduction effect of speaker 2 has not reached the expected level, and the noise signal generated by the fan system, a noise source, has a noise impact on the external environment, such as the position of the human body. Therefore, it is necessary to optimize the filtering parameters of the range hood based on the residual signal; if no, it means that the noise reduction effect of speaker 2 has reached the expected level, so step S203 is executed.

[0058] In one embodiment, step S203 specifically includes:

[0059] The signal amplitudes of the first noise signal and the second noise signal are compared, and the frequency region corresponding to the second noise signal having a greater signal amplitude than the first noise signal is determined as the noise enhancement region.

[0060] Specifically, the frequency spectra of the first and second noise signals are obtained by performing Fourier transforms on them, and the changes in their amplitudes are compared on the spectra. The amplitude can be used to characterize the sound pressure level of the noise signal. If the amplitude of the second noise signal in a certain frequency band is higher than that of the first noise signal, it indicates that the noise reduction signal of the loudspeaker 2 has not played a role in reducing the noise signal at the first location, but rather has played a role in amplifying it. This results in the noise signal of the fan system noise source collected by the reference microphone 1 being inaccurate, thus affecting the noise reduction effect.

[0061] In one embodiment, after step S203, the active noise reduction method further includes:

[0062] The noise reduction signal of each speaker is compared with the second noise signal to determine the appropriate speaker for the corresponding noise enhancement area.

[0063] The filtering parameters of the loudspeaker are optimized based on the noise enhancement region.

[0064] Since the noise reduction device of the range hood may have more than one speaker actively reducing noise at the first position, before optimizing the noise reduction of the noise enhancement area of ​​the second noise signal, the adjustment speaker in the noise enhancement area should be determined to achieve precise adjustment and avoid interfering with other frequency areas of the second noise signal.

[0065] S204. Optimize the speaker's filtering parameters based on the noise enhancement region to reduce the noise intensity of the second noise signal in the noise enhancement region.

[0066] In one embodiment, the filtering parameters of the loudspeaker are controlled to adjust the amplitude of the noise enhancement region of the loudspeaker noise reduction signal, thereby reducing the amplitude of the second noise signal in the noise enhancement region. Specifically, the noise enhancement region of the second noise signal is extracted. The noise-reduced signal played by the speaker filter is out of phase and has a similar amplitude to the second noise signal in the noise enhancement region.

[0067] 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:

[0068] The first acquisition module 31 is used to acquire the first noise signal at the first position of the range hood;

[0069] The first noise reduction module 32 is used to control the speaker to actively reduce the noise of the first noise signal and to collect the second noise signal at the first position of the range hood. The second noise signal is the superimposed noise signal collected during the active noise reduction process of the speaker.

[0070] The first determining module 33 is used to compare the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal;

[0071] The first optimization module 34 is used to optimize the filtering parameters of the loudspeaker based on the noise enhancement region, so as to reduce the noise intensity of the second noise signal in the noise enhancement region.

[0072] Optionally, the first determining module 33 is further configured to compare the signal amplitudes of the first noise signal and the second noise signal, and determine the frequency region corresponding to the second noise signal having a signal amplitude greater than that of the first noise signal as the noise enhancement region.

[0073] Optionally, the active noise cancellation device also includes:

[0074] The second noise reduction module is used to control the speaker to perform active noise reduction with optimized filtering parameters.

[0075] Optionally, the number of speakers can be multiple;

[0076] After the first determining module 33, the active noise reduction device also includes:

[0077] The second determining module is used to compare the noise reduction signal of each speaker with the second noise signal to determine the adjustable speaker corresponding to the noise enhancement area;

[0078] The second optimization module is used to optimize the filtering parameters of the adjustable speaker based on the noise enhancement region.

[0079] Optionally, before the first determining module 33, the active noise cancellation device further includes:

[0080] The second acquisition module is used to acquire residual signals at the second position of the range hood;

[0081] The judgment module is used to determine whether the residual signal is greater than a preset threshold; if yes, the third optimization module is executed; if no, the first determination module is executed.

[0082] The third optimization module is used to optimize the filtering parameters of the range hood based on the residual signal.

[0083] 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.

[0084] 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 displayed oil fume 40 is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention. The values ​​are similar.

[0085] 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).

[0086] Bus 43 includes a data bus, an address bus, and a control bus.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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: A first noise signal is collected at a first location of the range hood; the first location is near the fan system of the range hood; the first noise signal is the noise signal collected by a reference microphone when the fan system of the range hood is started but the speaker is not started. The speaker is controlled to actively reduce the noise of the first noise signal, and a second noise signal at the first position of the range hood is collected. The second noise signal is a superimposed noise signal collected during the active noise reduction process of the speaker. If the residual signal at the second position of the range hood is less than or equal to a preset threshold, the first noise signal and the second noise signal are compared to determine the noise enhancement area in the second noise signal; the second position is the air inlet of the long air duct of the range hood, close to the human body; The filtering parameters of the loudspeaker are optimized based on the noise enhancement region to reduce the noise intensity of the second noise signal in the noise enhancement region. The step of comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal includes: The signal amplitudes of the first noise signal and the second noise signal are compared, and the frequency region corresponding to the signal amplitude of the second noise signal being greater than that of the first noise signal is determined as the noise enhancement region.

2. The active noise reduction method as described in claim 1, characterized in that, The active noise reduction method further includes: The speaker is controlled to perform active noise reduction with optimized filtering parameters.

3. The active noise reduction method as described in claim 1, characterized in that, The number of speakers is multiple; After comparing the first noise signal and the second noise signal to determine the noise enhancement region in the second noise signal, the process includes: The noise reduction signal of each speaker is compared with the second noise signal to determine the appropriate speaker for the noise enhancement region; The filtering parameters of the adjustable loudspeaker are optimized based on the noise enhancement region.

4. The active noise reduction method as described in claim 1, characterized in that, If the residual signal is greater than the preset threshold, the filtering parameters of the speaker are optimized based on the residual signal.

5. An active noise reduction device for a range hood, characterized in that, The active noise reduction device includes: The first acquisition module is used to acquire a first noise signal at a first location of the range hood; the first location is near the fan system of the range hood; the first noise signal is a noise signal acquired by a reference microphone when the fan system of the range hood is started but the speaker is not started. The first noise reduction module is used to control the speaker to actively reduce the noise of the first noise signal and to collect the second noise signal at the first position of the range hood. The second noise signal is the superimposed noise signal collected during the active noise reduction process of the speaker. The second acquisition module is used to acquire residual signals at the second location of the range hood; the second location is the air inlet of the long air duct of the range hood, close to the human body. The judgment module is used to determine whether the residual signal is greater than a preset threshold. If the residual signal is less than or equal to the preset threshold, the first determination module is executed; The first determining module is used to compare the signal amplitudes of the first noise signal and the second noise signal, and to determine the frequency region where the signal amplitude of the second noise signal is greater than that of the first noise signal as the noise enhancement region in the second noise signal; The first optimization module is used to optimize the filtering parameters of the loudspeaker based on the noise enhancement region, so as to reduce the noise intensity of the second noise signal in the noise enhancement region.

6. The active noise cancellation device as described in claim 5, characterized in that, The active noise reduction device also includes: The second noise reduction module is used to control the speaker to perform active noise reduction with optimized filtering parameters.

7. The active noise cancellation device as described in claim 5, characterized in that, The number of speakers is multiple; After the first determining module, the active noise reduction device further includes: The second determining module is used to compare the noise reduction signal of each speaker with the second noise signal to determine the adjusting speaker corresponding to the noise enhancement area; The second optimization module is used to optimize the filtering parameters of the adjustable speaker based on the noise enhancement region.

8. The active noise cancellation device as described in claim 5, characterized in that, If the residual signal is greater than the preset threshold, then the third optimization module is executed; The third optimization module is used to optimize the filtering parameters of the loudspeaker based on the residual signal.

9. 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 4.

10. 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 4.

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