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

Abstract

The present invention discloses a range hood and its active noise reduction method, device, and computer-readable storage medium. The active noise reduction method includes: controlling a first speaker at a first position and a second speaker at a second position to perform active noise reduction; collecting a first noise signal at the first position and a second noise signal at the second position through a first error microphone and a second error microphone, respectively; collecting an ambient noise signal of the environment in which the range hood is located; analyzing the first noise signal and the second noise signal with the ambient noise signal, and adjusting the first speaker or the second speaker according to the analysis result. The noise signal of the range hood is reduced by the two speakers to specifically eliminate the noise generated by the range hood, and the noise source in the ambient noise is determined by analyzing the noise components in the ambient noise, and the speakers are adjusted in a targeted manner to further improve the noise reduction effect.

Description

Technical Field

[0001] The present invention relates to the field of range hoods, and in particular to a range hood and an active noise reduction method, device, and computer-readable storage medium thereof. Background Art

[0002] Range hoods are essential kitchen appliances. Their working principle is that a motor drives an impeller to rotate within a volute, generating negative pressure, thereby drawing fumes away and expelling them outdoors. However, range hoods often generate noise during operation, impacting the user experience.

[0003] In order to improve the noise reduction effect of range hoods, various manufacturers have tried to add noise reduction devices to range hoods to reduce the noise generated during the operation of the range hoods. However, most range hoods often use a noise reduction system to reduce the noise of the range hood as a whole, and cannot accurately reduce the noise according to the location of the noise source. As a result, the noise reduction effect of the range hood cannot meet the expectations, thereby affecting 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 noise cannot be accurately reduced according to the location of the noise source, 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 technical problems through the following technical solutions:

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

[0007] controlling a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction;

[0008] respectively collecting a first noise signal at the first position and a second noise signal at the second position by using a first error microphone and a second error microphone;

[0009] Collecting an environmental noise signal of the environment in which the range hood is located;

[0010] The first noise signal and the second noise signal are analyzed with the ambient noise signal, and the first speaker or the second speaker is adjusted according to the analysis result.

[0011] Preferably, analyzing the first noise signal, the second noise signal, and the ambient noise signal, and adjusting the first speaker or the second speaker according to the analysis result includes:

[0012] determining a first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment respectively;

[0013] The first coherence and the second coherence are compared, and the first speaker or the second speaker is adjusted according to the comparison result.

[0014] Preferably, the comparing the first coherence and the second coherence and adjusting the first speaker or the second speaker according to the comparison result includes:

[0015] When the first coherence is greater than or equal to the second coherence, controlling the first speaker to increase the signal energy of the noise reduction signal in the corresponding frequency band;

[0016] and / or,

[0017] When the first coherence is less than the second coherence, the second speaker is controlled to increase the signal energy of the noise reduction signal in the corresponding frequency band.

[0018] An active noise reduction device for a range hood, applied to the range hood, comprising:

[0019] a noise reduction module, configured to control a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction;

[0020] A noise collection module, configured to collect a first noise signal at the first position and a second noise signal at the second position through a first error microphone and a second error microphone respectively;

[0021] An environmental noise collection module, used to collect environmental noise signals of the environment in which the range hood is located;

[0022] The noise analysis module is configured to analyze the first noise signal, the second noise signal, and the ambient noise signal, and adjust the first speaker or the second speaker according to a result of the analysis.

[0023] Preferably, the noise analysis module includes:

[0024] a coherence determination unit, configured to respectively determine a first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment;

[0025] An adjustment unit is configured to compare the first coherence and the second coherence, and adjust the first speaker or the second speaker according to a result of the comparison.

[0026] Preferably, the adjustment unit is further used for:

[0027] When the first coherence is greater than or equal to the second coherence, controlling the first speaker to increase the signal energy of the noise reduction signal in the corresponding frequency band;

[0028] and / or,

[0029] When the first coherence is less than the second coherence, the second speaker is controlled to increase the signal energy of the noise reduction signal in the corresponding frequency band.

[0030] A range hood comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned active noise reduction methods for the range hood when executing the computer program.

[0031] A computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the active noise reduction method for a range hood described in any one of the above items is implemented.

[0032] The positive progressive effect of the present invention is that the present invention reduces the noise signal of the range hood through two speakers to specifically eliminate the noise generated by the range hood, and determines the noise source in the ambient noise by analyzing the noise components in the ambient noise, so as to adjust the speakers in a targeted manner to further improve the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1a A front view showing the positional relationship of a range hood provided by an exemplary embodiment of the present invention;

[0034] Figure 1b A side view showing the positional relationship of a range hood provided by an exemplary embodiment of the present invention;

[0035] Figure 2 A flow chart of an active noise reduction method for a range hood provided by an exemplary embodiment of the present invention;

[0036] Figure 3 A module diagram of an active noise reduction device for a range hood provided by an exemplary embodiment of the present invention;

[0037] Figure 4 A schematic diagram of a range hood provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described below by way of an exemplary embodiment, but the present invention is not limited to the scope of the embodiment.

[0039] An exemplary embodiment of the present invention provides an active noise reduction method for a range hood. The range hood includes a first reference microphone 111, a first speaker 112, a first error microphone 113, a second reference microphone 121, a second speaker 122, a second error microphone 123, and a reference microphone 130. The positional relationship of the range hood is specifically described in Figure 1a and Figure 1b shown.

[0040] The fan system of the range hood and its connected upper box are installed above the ceiling, and the fan system is connected to the lower box through an air flow channel.

[0041] The first reference microphone 111 is located between the lower panel and the fan system of the range hood, the first speaker 112 is located between the lower panel and the fan system of the range hood and the air flow channel, and the first error microphone 113 is located at the air inlet of the fan system of the range hood. The first reference microphone 111, the first speaker 112 and the first error microphone 113 constitute a first-level active noise reduction system.

[0042] The second reference microphone 121 is located in the air flow channel of the range hood, the second speaker 122 is located at the air inlet of the air flow channel, and the second error microphone 123 is located in the external space of the air flow channel. The second reference microphone 121, the second reference microphone 122 and the second error microphone 123 constitute a two-level active noise reduction system.

[0043] The reference microphone 130 collects the ambient noise signal by simulating the position of a human ear.

[0044] See also Figure 2 As shown, the active noise reduction methods of the range hood include:

[0045] S201: Control a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction.

[0046] In one embodiment, the range hood is turned on and its fan system is controlled to start running. A first speaker and a second speaker each play noise reduction signals to reduce noise in the range hood. The first speaker is used to reduce noise near the fan system, while the second speaker is used to reduce noise near the airflow path into the range hood. This provides targeted noise reduction for the range hood, avoiding the limitations of a single speaker's noise reduction capabilities, which could affect the noise reduction effect.

[0047] S202 : Collect a first noise signal at a first position and a second noise signal at a second position through a first error microphone and a second error microphone, respectively.

[0048] In one embodiment, the first error microphone is controlled to collect a first noise signal of a fan system of the range hood, and the second error microphone is controlled to collect a second noise signal of an air flow channel of the range hood.

[0049] S203: Collecting an environmental noise signal of the environment where the range hood is located.

[0050] In one embodiment, the ambient noise signal of the environment in which the range hood is located is collected by a monitoring microphone, that is, the noise signal generated by the range hood as a whole as heard by a human ear is simulated.

[0051] S204: Analyze the first noise signal, the second noise signal, and the ambient noise signal, and adjust the first speaker or the second speaker according to the analysis result.

[0052] In one embodiment, step S204 is specifically implemented by the following steps:

[0053] A first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment are determined respectively.

[0054] The spectrum f1 of the first noise signal, the spectrum f2 of the second noise signal and the ambient noise signal f0 are subjected to regional analysis, that is, the three spectra are cut into multiple spectrum segments according to frequency: [x1, x2], [x2, x3], ..., [x n-1 ,x n ].

[0055] In each spectrum segment, a first coherence e1 between the first noise signal f1 and the ambient noise signal f0 and a second coherence e2 between the second ambient noise signal f2 and the ambient noise signal f0 are calculated.

[0056] The coherence calculation formula is: G xy is the cross power spectrum density of the first noise signal or the second noise signal and the ambient noise signal, G xx is the autopower spectral density of the first noise signal or the second noise signal, G yy is the auto-power spectral density of the ambient noise signal. The first coherence and second coherence are calculated respectively.

[0057] The first coherence e1 and the second coherence e2 are compared.

[0058] When the first coherence e1 is greater than or equal to the second coherence e2, it means that the ambient noise signal is more correlated with the first noise signal in this spectrum segment, that is, the noise mainly comes from the fan system on the ceiling. The first speaker is controlled to increase the signal energy ΔP of the noise reduction signal corresponding to the spectrum segment until the corresponding signal energy reaches the energy threshold, where the signal energy can be the amplitude of the signal.

[0059] When the first coherence is less than e1 and the second coherence is less than e2, it means that the ambient noise signal is more correlated with the second noise signal in this spectrum segment, that is, the noise signal mainly comes from the air inlet of the air flow channel. The second speaker is controlled to increase the signal energy ΔM of the corresponding frequency band of the noise reduction signal until the corresponding signal energy reaches the energy threshold.

[0060] The present embodiment is further described below with reference to a specific implementation method.

[0061] The first error microphone is controlled to collect the first noise signal f1 of the range hood fan system, the second microphone is controlled to collect the second noise signal f2 of the range hood airflow channel, and the monitoring microphone is controlled to collect the ambient noise signal f0 of the range hood environment.

[0062] Perform regional analysis on the three noise signals above and cut the three segments into multiple spectrum segments: [x1,x2], [x2,x3],…, [x n-1 ,x n The following is a detailed analysis using the spectrum segment [x1, x2] as an example.

[0063] In the range [x1, x2], the coherence e1 between the first noise signal f1 and the ambient noise signal f0 and the coherence e2 between the second noise signal f2 and the ambient noise signal f0 are calculated.

[0064] When the coherence e1 is greater than the coherence e2, it means that in [x 1, In the range of [x1, x2], the noise mainly comes from the fan system on the crane. Therefore, the first speaker is controlled to increase the noise reduction amplitude of the noise reduction signal in the range of [x1, x2] to achieve more accurate noise reduction.

[0065] When the coherence e1 is less than the coherence e2, it means that in [x 1, In the range of [x1, x2], the noise mainly comes from the air inlet of the airflow channel. Therefore, the second speaker is controlled to increase the noise reduction amplitude of the noise reduction signal in the range of [x1, x2] to achieve more accurate noise reduction.

[0066] This embodiment first sets a speaker at a position close to the noise source for noise reduction, which can reduce the noise in a targeted manner. In addition, by analyzing the noise components of each spectrum fragment in the range hood environment, it can determine the source of the noise and specifically control the corresponding speaker to increase the signal energy of the noise reduction signal with the corresponding spectrum deviation, so as to achieve precise noise reduction, improve user experience, and effectively avoid noise leakage.

[0067] Figure 3 An active noise reduction device for a range hood provided by an exemplary embodiment of the present invention is applied to the range hood. The active noise reduction device includes:

[0068] A noise reduction module 31 is configured to control a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction;

[0069] The noise collection module 32 is configured to collect a first noise signal at a first position and a second noise signal at a second position through a first error microphone and a second error microphone, respectively;

[0070] An environmental noise collection module 33 is used to collect environmental noise signals of the environment in which the range hood is located;

[0071] The noise analysis module 34 is configured to analyze the first noise signal, the second noise signal, and the ambient noise signal, and adjust the first speaker or the second speaker according to the analysis result.

[0072] Preferably, the noise analysis module 34 includes:

[0073] a coherence determination unit, configured to respectively determine a first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment;

[0074] The adjustment unit is used to compare the first coherence and the second coherence, and adjust the first speaker or the second speaker according to the comparison result.

[0075] Preferably, the regulating unit is further configured to:

[0076] When the first coherence is greater than or equal to the second coherence, controlling the first speaker to increase the signal energy of the corresponding frequency band of the noise reduction signal;

[0077] and / or,

[0078] When the first coherence is less than the second coherence, the second speaker is controlled to increase the signal energy of the corresponding frequency band of the noise reduction signal.

[0079] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial 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 separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present invention. A person of ordinary skill in the art can understand and implement the present invention without inventive work.

[0080] Figure 4 This is a schematic structural diagram of a range hood according to an exemplary embodiment of the present invention, and shows a block diagram of an exemplary range hood 40 suitable for implementing the embodiment of the present invention. Figure 4 The range hood 40 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0081] like Figure 4 As shown, the range hood 40 can be implemented as a general-purpose computing device, such as a server device. Components of the range hood 40 may include, but are not limited to, the at least one processor 41, the at least one memory 42, and a bus 43 connecting various system components (including the memory 42 and the processor 41).

[0082] The bus 43 includes a data bus, an address bus, and a control bus.

[0083] The memory 42 may include a volatile memory, such as a random access memory (RAM) 421 and / or a cache memory 422 , and may further include a read-only memory (ROM) 423 .

[0084] The memory 42 may also include a program tool 425 (or utility) having a set (at least one) of program modules 424, such program modules 424 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.

[0085] The processor 41 executes various functional applications and data processing by running the computer programs stored in the memory 42, such as the method provided in any of the above embodiments.

[0086] The range hood 40 can also communicate with one or more external devices 44. This communication can occur via an input / output (I / O) interface 45. Furthermore, the model-generated range hood 40 can also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 46. As shown, the network adapter 46 communicates with other modules of the model-generated range hood 40 via a bus 43. It should be understood that, although not shown in the figures, 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 (RAID) systems, tape drives, and data backup storage systems.

[0087] It should be noted that while the above detailed description refers to several units / modules or sub-units / modules of the range hood, this division is merely exemplary and not mandatory. In practice, depending on the embodiments of the present invention, the features and functions of two or more units / modules described above may be embodied in a single unit / module. Conversely, the features and functions of a single unit / module described above may be further divided and embodied by multiple units / modules.

[0088] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the method provided in any of the above embodiments when the program is executed by a processor.

[0089] 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 thereof.

[0090] In a possible implementation manner, the embodiment of the present invention may also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute a method for implementing any of the above embodiments.

[0091] The program code for executing the present invention may be written in any combination of one or more programming languages, and may 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 the remote device.

[0092] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention 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 invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. An active noise reduction method for a range hood, characterized in that: The active noise reduction method comprises: controlling a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction; respectively collecting a first noise signal at the first position and a second noise signal at the second position by using a first error microphone and a second error microphone; Collecting an environmental noise signal of the environment in which the range hood is located; Analyzing the first noise signal and the second noise signal with the ambient noise signal, and adjusting the first speaker or the second speaker according to a result of the analysis; The analyzing the first noise signal, the second noise signal, and the ambient noise signal, and adjusting the first speaker or the second speaker according to the analysis result, includes: determining a first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment respectively; The first coherence and the second coherence are compared, and the first speaker or the second speaker is adjusted according to the comparison result.

2. The active noise reduction method according to claim 1, wherein: The comparing the first coherence and the second coherence, and adjusting the first speaker or the second speaker according to the comparison result, includes: When the first coherence is greater than or equal to the second coherence, controlling the first speaker to increase the signal energy of the noise reduction signal in the corresponding frequency band; and / or, When the first coherence is less than the second coherence, the second speaker is controlled to increase the signal energy of the noise reduction signal in the corresponding frequency band.

3. An active noise reduction device for a range hood, characterized in that: Applied to a range hood, the active noise reduction device comprises: a noise reduction module, configured to control a first speaker located at a first position and a second speaker located at a second position to perform active noise reduction; A noise collection module, configured to collect a first noise signal at the first position and a second noise signal at the second position through a first error microphone and a second error microphone respectively; An environmental noise collection module, used to collect environmental noise signals of the environment in which the range hood is located; a noise analysis module, configured to analyze the first noise signal, the second noise signal, and the ambient noise signal, and adjust the first speaker or the second speaker according to a result of the analysis; The noise analysis module includes: a coherence determination unit, configured to respectively determine a first coherence between the first noise signal and the ambient noise signal and a second coherence between the second noise signal and the ambient noise signal in each frequency segment; An adjustment unit is configured to compare the first coherence and the second coherence, and adjust the first speaker or the second speaker according to a result of the comparison.

4. The active noise reduction device according to claim 3, wherein: The regulating unit is further configured to: When the first coherence is greater than or equal to the second coherence, controlling the first speaker to increase the signal energy of the noise reduction signal in the corresponding frequency band; and / or, When the first coherence is less than the second coherence, the second speaker is controlled to increase the signal energy of the noise reduction signal in the corresponding frequency band.

5. A range hood comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the active noise reduction method for the range hood according to claim 1 or 2 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the active noise reduction method for the range hood according to claim 1 or 2 is implemented.

Images