Noise reduction device, extractor hood equipment and noise reduction method of extractor hood

Abstract

The invention relates to a noise reduction device, extractor hood equipment and an extractor hood noise reduction method. The noise reduction device comprises at least two side beams, a fixed interface, a supporting plate, a sound collection device and a loudspeaker, the fixed interface and each side beam are connected with the supporting plate through a connecting rod, and the loudspeaker and the sound collection device are arranged on different side beams respectively; a sound signal output by the loudspeaker and a sound signal collected by the sound collection device are interfered and offset at the sound receiving end. By adopting the device, noise signals can be actively counteracted by using the interference principle of sound waves, and the noise reduction effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of noise reduction for range hoods, and particularly to a noise reduction device, a range hood device, a range hood noise reduction method, a device, a computer device, a computer-readable storage medium, and a computer program product. Background Art

[0002] Range hoods play a crucial role in modern kitchens. They can not only effectively absorb the oil fumes generated during cooking and reduce indoor air pollution. However, a common problem with range hoods is that they produce relatively high noise, which may cause damage to users' hearing after long-term use.

[0003] Traditional noise reduction methods usually optimize the structural design of the range hood to reduce the noise of the range hood at the sound source, or add sound insulation materials to the range hood to reduce the noise transmitted into the human ear during the noise propagation process.

[0004] However, traditional solutions mainly reduce noise through physical means. Optimizing the structural design of the range hood has a high cost and low noise reduction efficiency. Although sound insulation materials have a good absorption effect on high-frequency noise, their processing effect on medium and low-frequency noise is not good, that is, the noise reduction effect of traditional noise reduction solutions is low. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a noise reduction device, a range hood device, a range hood noise reduction method, a device, a computer device, a computer-readable storage medium, and a computer program product that can improve the noise reduction effect.

[0006] In a first aspect, this application provides a noise reduction device. The noise reduction device includes at least two side beams, a fixed interface, a support plate, a sound collection device, and a speaker. The fixed interface and each side beam are connected to the support plate through connecting rods. The speaker and the sound collection device are respectively arranged on different side beams, and the sound signal output by the speaker and the sound signal collected by the sound collection device interfere and cancel each other at the sound receiving end.

[0007] In one embodiment, the noise reduction device further includes a controller. The controller is arranged on the support plate and is connected to the sound collection device and the speaker.

[0008] In one embodiment, an opening is provided on the support plate, and the controller is connected to the support plate through the opening.

[0009] In one embodiment, the fixed interface is a screw hole structure.

[0010] In one embodiment, the sound collection device includes a microphone.

[0011] In one embodiment, the number of the side beams is two.

[0012] In a second aspect, the present application further provides an oil fume suction device, which includes an oil fume suction device body and a noise reduction device as described in any one of the above embodiments of the noise reduction device. The noise reduction device is suspended in the oil fume suction device body, and the sound collection device of the noise reduction device is used to collect the sound signal generated when the fan of the oil fume suction device body works.

[0013] In one embodiment, the loudspeaker of the noise reduction device is located in the housing of the oil fume suction device body. The housing is provided with an opening, and the loudspeaker faces the opening of the housing.

[0014] In one embodiment, the size of the opening of the housing is larger than the size of the loudspeaker.

[0015] In one embodiment, the controller of the noise reduction device is further configured to perform offline calibration on the sound transfer function among the fan end, the loudspeaker end, and the sound receiving end.

[0016] In a third aspect, the present application further provides an oil fume suction noise reduction method, which is applied to the oil fume suction device in any one of the above embodiments of the oil fume suction device. The method includes:

[0017] When the oil fume suction device is operating, receiving the sound signal sent by the sound collection device;

[0018] According to the sound signal and a preset first transfer function, determining the expected sound signal at the sound receiving end when the sound signal is transmitted, and determining the reverse expected sound signal of the expected sound signal;

[0019] According to the reverse expected signal and a preset second transfer function, determining the target sound signal;

[0020] Controlling the loudspeaker to play the target sound signal.

[0021] In a fourth aspect, the present application further provides an oil fume suction noise reduction device, including:

[0022] A data acquisition module, configured to receive the sound signal sent by the sound collection device when the oil fume suction device is operating.

[0023] A first signal analysis module, configured to determine the expected sound signal at the sound receiving end when the sound signal is transmitted and the reverse expected sound signal of the expected sound signal according to the sound signal and a preset first transfer function.

[0024] A second signal analysis module, configured to determine the target sound signal according to the reverse expected signal and a preset second transfer function.

[0025] A signal playback module for controlling a speaker to play a target sound signal.

[0026] In a fifth aspect, the present application further provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps in the embodiment of the above-mentioned noise reduction method for a range hood are implemented.

[0027] In a sixth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the embodiment of the above-mentioned noise reduction method for a range hood are implemented.

[0028] In a seventh aspect, the present application further provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps in the embodiment of the above-mentioned noise reduction method for a range hood are implemented.

[0029] For the above-mentioned noise reduction device, range hood device, range hood noise reduction method, device, computer device, computer-readable storage medium and computer program product, the noise reduction device can be stably fixed near the range hood through the connection structure of the fixing device interface, support plate, side beam and connecting rod, and maintain a suspended positional relationship with the range hood body. The sound collection device can collect the sound signal generated by the range hood, providing data support for subsequent noise reduction processing. The speaker can play a sound with a phase opposite to that of the sound signal, and use the principle of sound wave interference to cancel out the sound generated by the range hood, improving the noise reduction effect of the range hood. The range hood device combines the noise reduction device with the range hood body. The noise reduction device is suspended in the range hood body, forming a relatively independent structure with the range hood body, reducing the interference of the vibration of the range hood body on the noise reduction device. The sound collection device is used to collect the sound signal generated when the fan of the range hood body works, so as to cancel out the noise generated by the fan of the range hood body at the human ear or other sound receiving ends through the principle of sound wave interference, improving the noise reduction effect. When the range hood device is operating, the controller receives the sound signal sent by the sound collection device, then simulates and analyzes the sound propagation process according to a preset first transfer function, determines the expected sound signal at the sound receiving end when the sound signal is transmitted, and determines the reverse expected sound signal of the expected sound signal. Then, according to the reverse expected signal and a preset second transfer function, a target sound signal that can cancel out the sound signal at the sound receiving end is generated. Finally, the speaker is controlled to play the target sound signal. Using the principle of active noise reduction, the target sound signal emitted by the speaker interferes with and cancels out the sound signal generated by the range hood at the sound receiving end to achieve noise reduction, improving the noise reduction effect of the range hood. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the accompanying drawings required for the description in the embodiments of the present application or related technologies. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a noise reduction device in an embodiment;

[0032] Figure 2 It is a schematic structural diagram of a noise reduction device in another embodiment;

[0033] Figure 3 It is a schematic structural diagram of a range hood device in an embodiment;

[0034] Figure 4 It is a schematic flowchart of a noise reduction method for a range hood in an embodiment;

[0035] Figure 5 It is a structural block diagram of a noise reduction device for a range hood in an embodiment;

[0036] Figure 6 It is an internal structural diagram of a computer device in an embodiment.

[0037] Description of the drawings: 100, noise reduction device; 110, side beam; 120, fixed interface; 130, support plate; 140, sound collection device; 150, speaker; 160, controller; 200, range hood device; 300, range hood body; 310, fan; 320, housing. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0040] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, the first resistor may be referred to as the second resistor, and similarly, the second resistor may be referred to as the first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0041] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least part of an element" means part or all of the element.

[0042] As used herein, the singular forms "a", "an", and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / comprising", "has / including", etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0043] In one embodiment, as Figure 1 shown, a noise reduction device 100 is provided. The noise reduction device 100 includes at least two side beams 110, a fixed interface 120, a support plate 130, a sound collection device 140, and a speaker 150. The fixed interface 120 and each side beam 110 are connected to the support plate 130 through connecting rods. The speaker 150 and the sound collection device 140 are respectively arranged on different side beams. The sound signal output by the speaker 150 and the sound signal collected by the sound collection device 140 interfere and cancel each other at the sound receiving end.

[0044] Among them, the side beam 110 can be used to fix the sound collection device 140 and the speaker 150. Figure 1Taking two side beams 110(1) and 110(2) as an example, at least two side beams 110 can enable the speaker 150 and the sound collection device 140 to be respectively arranged on different side beams 110. This layout can enable the sound collection device 140 to better collect the sounds in the surrounding environment, and the speaker 150 can also output the sound signal for noise cancellation at a suitable position. The fixing interface 120 is used to fix the noise reduction device 100 at a specific position. For example, the fixing interface 120 can be a screw hole structure. By embedding a screw into the fixing interface 120 and entering the wall surface, the noise reduction device 100 can be fixed on the wall surface. The support plate 130 is used to connect other structures in the noise reduction device 100. For example, it is connected to each side beam 110 and the fixing interface 120 through connecting rods, playing a role in supporting and integrating the entire noise reduction device 100.

[0045] The sound collection device 140 can be a device such as a microphone, which is used to collect the sound signals in the surrounding environment. For example, the sound collection device 140 is arranged near the fan of the range hood device to collect the sound signals emitted when the fan is working. The speaker 150 is a device for emitting sound signals, and the sound signals output by it cooperate with the sound signals collected by the sound collection device 140 to achieve the purpose of noise reduction. The sound receiving end refers to the area or device where the noise reduction effect needs to be achieved. For example, a person's ear. At this position, the sound signals collected by the sound collection device 140 and the sound signals output by the speaker 150 will interfere with each other. Based on the principle of wave interference, when two sound waves with the same frequency and opposite phases meet, they will be superimposed on each other, causing the amplitudes to cancel each other out, thereby achieving the effect of reducing the sound intensity.

[0046] When the above noise reduction device is applied to a range hood device, through the connection structure of the fixing device interface, the support plate, the side beam and the connecting rod, the noise reduction device can be stably fixed near the range hood and maintain a suspended positional relationship with the range hood body. The sound collection device can collect the sound signals generated by the range hood, providing data support for subsequent noise reduction processing. The speaker can play a sound with a phase opposite to that of the sound signal, and use the principle of sound wave interference to cancel out the sound generated by the range hood, improving the noise reduction effect of the range hood.

[0047] In one embodiment, as Figure 2 shown, the noise reduction device 100 further includes a controller 160. The controller 160 is arranged on the support plate 130, and the controller 160 is connected to the sound collection device 140 and the speaker 150.

[0048] Among them, the controller 160 can be the core component of the noise reduction device 100, which can be used to receive, process, and analyze the sound signals from the sound collection device 140, and generate corresponding control signals according to the sound signals to control the speaker 150 to output appropriate sound signals for noise reduction.

[0049] Specifically, the controller 160 can be arranged on the support plate 130 and connected to the sound collection device 140 and the speaker 150. In this way, the controller 160 can stably obtain the sound signals sent by the sound collection device 140 and accurately send control signals to the speaker 150. After the sound collection device 140 collects the sound signals in the surrounding environment, it transmits the sound signals to the controller 160. After receiving the sound signals, the controller 160 combines the pre-calibrated transfer function to control the speaker 150 to generate sound signals that can be used for noise reduction. The sound signals generated by the speaker 150 and the sound signals collected by the sound collection device 140 interfere at the sound receiving end. After propagation, the two sound signals have the same frequency and opposite phases, so interference cancellation can be achieved and the noise reduction effect can be achieved.

[0050] In addition, the controller 160 may not be fixed at the support plate 130 and may also be a cloud controller. However, considering the timeliness of the noise reduction process, installing the controller 160 at the support plate 130 can improve the timeliness of noise reduction and achieve real-time noise reduction.

[0051] In this embodiment, the controller of the noise reduction device can coordinate the work of the sound collection device and the speaker, analyze the signals collected by the sound collection device in real time, and dynamically adjust the sound signals output by the speaker according to the changes in the ambient noise to achieve the best noise reduction effect and improve the reliability of the noise reduction device.

[0052] In one embodiment, an opening is provided on the support plate 130, and the controller 160 is connected to the support plate 130 through the opening.

[0053] Among them, the opening refers to a deliberately opened hole or notch on the support plate 130 for connecting the support plate 130 and the controller. For example, 4 openings can be provided on the support plate 130, and the controller 160 is connected to the support plate 130 through the openings. The connection method can be screw fixation, bayonet connection, or other mechanical connection methods.

[0054] In this embodiment, the opening on the support plate makes the installation and disassembly of the controller more convenient, and can make the controller more closely combined with the support plate, saving space and optimizing the structural layout of the noise reduction device, reducing the interference between components in the noise reduction device, and improving the reliability of the noise reduction device.

[0055] In one embodiment, the fixed interface 120 has a screw hole structure.

[0056] Continuing with the above embodiments, the screw hole structure refers to a hole with internal threads machined on a component. Through the cooperation of corresponding bolts or screws, for example, internal threads are machined inside the fixing interface 120, and then a bolt or screw that matches the internal threads can pass through the fixing interface 120 and enter the installation hole of the wall or other object. By tightening the bolt or screw, the noise reduction device 120 can be firmly fixed to the target object.

[0057] In this embodiment, through the cooperation of the fixing interface with the screw hole structure and the bolt or screw, the noise reduction device can be firmly fixed to the target object. This connection method can withstand certain external forces and vibrations, reducing the risk of loosening or falling off of the noise reduction device during operation and improving the reliability of the noise reduction device.

[0058] In one embodiment, the sound collection device 140 includes a microphone.

[0059] Among them, the microphone, also known as a microphone, can convert sound signals into electrical signals. The microphone can sense the sound wave vibrations in the surrounding environment and convert them into electrical signals through internal sensitive elements, and transmit the relevant information of the sound signal to the controller 160 in the form of electrical signals. In this embodiment, the microphone used in the sound collection device 140 may include, but is not limited to, dynamic microphones, condenser microphones, etc. The sound collection device 140 may also be other sound sensors or a sound sensor array, such as a microphone array.

[0060] Specifically, when the noise reduction device 100 is in the working state, the microphone starts to sense the sounds in the surrounding environment. The sound waves cause the sensitive elements inside the microphone (such as the voice coil of a dynamic microphone, the diaphragm of a condenser microphone, etc.) to vibrate, thereby converting the sound signal into an electrical signal. The microphone sends the electrical signal to the controller 160 for further analysis.

[0061] In this embodiment, by using a microphone to collect the sound signals in the surrounding environment, the noise reduction device can respond in a timely manner to changes in environmental noise. The controller can adjust the sound signals output by the speaker according to the signals transmitted by the microphone in real time to achieve a more effective noise reduction effect.

[0062] In one embodiment, as Figure 2 shown, the number of side beams 110 is two.

[0063] Continuing with the above embodiments, the side beams 110 can be used to provide support for the sound collection device 140 and the speaker 150, so that they have a reasonable position and layout in space. Specifically, the number of side beams 110 can be two. The two side beams 110 are connected to the support plate 130 through connecting rods. During the connection process, the positions of the two side beams 110 can be made symmetrical, which can improve the balance and stability of the noise reduction device.

[0064] In this embodiment, two side beams are provided in the noise reduction device, which not only provides a suitable installation position for the sound collection device and the speaker, but also can construct a stable and balanced structural framework. If the two side beams are symmetrically distributed, the force on the noise reduction device can be made more uniform, improving the stability of the noise reduction device.

[0065] In one embodiment, as Figure 3 shown, an oil fume suction machine device 200 is provided. The oil fume suction machine device 200 includes an oil fume suction machine body 300 and a noise reduction device 100 according to any one of the noise reduction device embodiments. The noise reduction device 100 is suspended in the oil fume suction machine body 300. The sound collection device 140 of the noise reduction device 100 is used to collect the sound signals generated when the fan 310 of the oil fume suction machine body 300 operates.

[0066] Among them, the oil fume suction machine body 300 is the core working part of the oil fume suction machine device 200, which can be divided into an upper body machine, a lower body machine, a housing, an air intake grille, a fan, etc. The upper body machine is used to discharge the inhaled oil fume through an external ventilation duct. The housing is used to protect the internal components of the oil fume suction machine body. The air intake grille is the entrance for the oil fume to enter the oil fume suction machine. While inhaling the oil fume, it also blocks larger debris. The lower body machine is used to collect the inhaled oil fume and guide the oil fume into the air duct system inside the oil fume suction machine body. The fan 310 is a key component in the oil fume suction machine body 300, which can generate suction force by rotating at high speed to suck the oil fume away and discharge it outdoors.

[0067] Exemplarily, the noise reduction device 100 can be installed at any position other than the oil fume suction machine body 300 to reduce the influence of the vibration generated during the operation of the oil fume suction machine body 300 on the noise reduction process. For example, the noise reduction device 100 can be installed on the wall and suspended in the oil fume suction machine body 300. The sound collection device 140 in the noise reduction device 100 can be arranged near the fan 310 of the oil fume suction machine body 300 to capture the sound signals generated during the operation of the fan 310 and send them to the controller 160. The controller 160 analyzes the sound signals and, based on the principle of wave interference, controls the speaker 150 to generate specific sound signals. The generated sound signals interfere at the sound receiving end (such as near the human ear), with the same frequency, opposite phase, and cancel each other out, thereby reducing the noise generated when the oil fume suction machine works.

[0068] In this embodiment, the range hood device combines the noise reduction device with the range hood body. The noise reduction device is suspended in the range hood body, forming a relatively independent structure with the range hood body, reducing the interference of the vibration of the range hood body on the noise reduction device. The sound collection device is used to collect the sound signals generated when the fan of the range hood body works, so as to cancel the noise generated by the fan of the range hood body at the human ear or other sound receiving ends through the principle of sound wave interference, improving the noise reduction effect.

[0069] In one embodiment, as Figure 3 shown, the loudspeaker 150 of the noise reduction device 100 is located inside the housing 320 of the range hood body 300. The housing 320 is provided with an opening, and the loudspeaker 150 faces the opening of the housing 320.

[0070] Continuing with the above embodiment, the housing 320 of the range hood body can play a role in protecting its internal components. Setting specific holes or openings in the housing 320 can provide a propagation channel for the sound signals emitted by the loudspeaker 150, enabling the sound signals output by the loudspeaker 150 to reach the area where noise reduction is required smoothly.

[0071] Exemplarily, the noise reduction device 100 is suspended inside the range hood body 300. The noise reduction device 100 itself does not contact the range hood body 300. The sound collection device 140 of the noise reduction device 100 is arranged near the fan 310 for noise collection and does not contact the fan 310 either. The loudspeaker 160 is arranged inside the housing 320, and the loudspeaker 160 faces the opening of the housing 320. In this way, the sound signals generated by the loudspeaker 160 can be propagated smoothly, and at the same time, the influence of the sound signals generated by the loudspeaker 160 on the sound collection device 140 can be reduced. When the sound signals generated by the fan 310 during operation and the sound signals generated by the loudspeaker 160 are transmitted to the human ear position, their frequencies are the same, amplitudes are the same, and phases are opposite. According to the principle of wave interference, the two are superimposed and cancelled each other, thereby weakening the noise during the operation of the range hood.

[0072] In this embodiment, the loudspeaker is located inside the housing and faces the opening, which can more effectively transmit the output sound to the sound receiving end, making the interference cancellation effect of the sound signals more obvious. At the same time, it can also reduce the influence of the sound emitted by the loudspeaker on the sound collection device, improve the accuracy of noise collection, and further improve the noise reduction effect.

[0073] In one embodiment, the size of the opening of the housing 320 is larger than the size of the loudspeaker 150.

[0074] Among them, the housing 320, as a structure on the range hood body 300 for transmitting sound signals, has a size larger than that of the speaker 150, which means that the opening exceeds the corresponding size of the speaker 150 in dimensions such as length, width or diameter, and can provide a more spacious channel for the transmission of the sound of the speaker 150. Moreover, the speaker 150 does not contact the opening, but there is a certain distance to reduce the influence of the vibration of the range hood body 300 itself on the speaker 150.

[0075] In this embodiment, the size of the opening is larger than that of the speaker, providing a more spacious channel for sound transmission. Therefore, during the transmission of sound signals, they can be less affected by reflections and diffractions at the edge of the opening, etc., and can maintain a better waveform and intensity, so as to be more effectively superimposed with and cancel out noise signals, achieving the purpose of reducing the operating noise of the range hood.

[0076] In one embodiment, the controller 160 of the noise reduction device 100 is further configured to perform offline calibration on the sound transfer function between the fan end, the speaker end and the sound receiving end.

[0077] Among them, the sound transfer function describes the change characteristics of sound signals when they are transmitted from one position (such as the fan end) to another position (such as the speaker end or the sound receiving end), including changes in amplitude and phase. Offline calibration means that when the range hood body 300 works alone, the sound signals at the fan end, the speaker end and the sound receiving end are respectively collected, and the sound transfer function between each end is calculated.

[0078] Exemplarily, the first noise collection device, the second noise collection device, and the third noise collection device can be used to collect the sound signals at the fan end, the speaker end and the sound receiving end respectively, and send them to the controller 160. The first noise collection device is used to collect the sound signal at the fan end (the first noise collection device can also be directly replaced by the sound collection device 140), the second noise collection device is used to collect the sound signal at the speaker end, and the third noise collection device is used to collect the sound signal at the sound receiving end. The second noise collection device can be arranged near the speaker 160, for example, at a certain distance in the front, and the two do not contact. The third noise collection device can be arranged near the sound receiving end. Taking the sound receiving end as the human ear, generally speaking, the position of the human ear during cooking is approximately at a certain distance obliquely below the range hood, for example, at a position 30 degrees below the center and 0.5 - 0.8 meters away.

[0079] Further, after the controller 160 receives the sound signals from the fan end, the speaker end, and the sound receiving end, by comparing the sound signals between different ends, it calculates the sound transfer function from the fan end to the speaker end and the sound transfer function from the speaker end to the sound receiving end, thus completing the offline calibration. After completing the offline calibration, the first noise collection device, the second noise collection device, and the third noise collection device can be removed (if the first noise collection device is the sound collection device 140, it can be not removed).

[0080] In this embodiment, by calibrating the sound transfer function offline, the controller can more accurately understand the propagation characteristics of sound between the fan end, the speaker end, and the sound receiving end. During the actual noise reduction process, based on this precise information, the sound signal output by the speaker can be adjusted to better match the noise signal in terms of amplitude and phase, so as to more effectively perform interference cancellation and improve the accuracy and effect of noise reduction.

[0081] In one embodiment, as Figure 4 shown, a noise reduction method for a range hood is provided, which is applied to the above range hood device 200. The method includes the following steps:

[0082] S100, when the range hood device is operating, receive the sound signal sent by the sound collection device.

[0083] When the range hood device is operating, the fan will also start to rotate to generate a sound signal. The sound collection device collects the sound signal generated by the rotation of the fan. The sound signal is converted into an electrical signal in the sound collection device and transmitted to the controller by means of a connection line (or wireless connection).

[0084] S200, according to the sound signal and the preset first transfer function, determine the expected sound signal at the sound receiving end when the sound signal is transmitted, and determine the reverse expected sound signal of the expected sound signal.

[0085] Among them, the preset first transfer function describes the change of the sound signal from the fan end to the sound receiving end, and the preset second transfer function describes the change of the sound signal from the speaker end to the sound receiving end. In this embodiment, the sound receiving end is the human ear. After the controller receives the sound signal generated by the fan it will combine the preset first transfer function to determine the expected sound signal at the sound receiving end when the sound signal is transmitted which is expressed by the formula as follows:

[0086] (1)

[0087] Theoretically speaking, the expected sound signal and the reverse expected sound signal It can be completely canceled at the human ear, but in practice, there may be errors. The error signal after cancellation can be expressed as:

[0088] (2)

[0089] S300. Determine the target sound signal according to the reverse expected signal and the preset second transfer function.

[0090] In this embodiment, it can be considered that the effect of active noise cancellation is completely ideal, that is, assuming is equal to 0. At this time, it is assumed that the controller receives After that, control the speaker to play the sound signal , then combined with the preset second transfer function 2, the sound signal and the reverse expected sound signal relationship:

[0091] (3)

[0092] By combining formula (1) and formula (2), the target sound signal that can cancel the sound signal generated by the fan at the human ear can be calculated :

[0093] (4)

[0094] S400. Control the speaker to play the target sound signal.

[0095] Following the above steps, after the controller calculates the target sound signal , send the corresponding control signal to the speaker. After the speaker receives the control signal, it will play the target sound signal . Since when the sound signal propagates to the human ear, the target sound signal and the sound signal generated by the fan have the same frequency, the same amplitude, and opposite phases, so the two interfere and cancel each other, thereby reducing the noise level entering the human ear.

[0096] It should be noted that in formula (1), it is assumed that the sound signal collected by the first noise collection device does not distort during the propagation process. In formula (3), it is assumed that the target sound signal played by the speaker does not distort during the propagation process. If the distortion situation during the sound propagation process needs to be considered, only the sound signal needs to be multiplied by the distortion coefficient.

[0097] In this embodiment, when the range hood device is operating, the controller receives the sound signal sent by the sound collection device, then simulates and analyzes the sound propagation process according to a preset first transfer function, determines the expected sound signal at the sound receiving end of the sound signal transmission, and determines the reverse expected sound signal of the expected sound signal. Then, according to the reverse expected signal and a preset second transfer function, a target sound signal capable of canceling out the sound signal at the sound receiving end is generated. Finally, the controller controls the speaker to play the target sound signal. Using the principle of active noise reduction, the target sound signal emitted by the speaker interferes with and cancels out the sound signal generated by the range hood at the sound receiving end to achieve noise reduction, improving the noise reduction effect of the range hood.

[0098] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, these steps do not necessarily have to be executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages do not necessarily have to be executed at the same time, but can be executed at different times. The execution order of these steps or stages does not necessarily have to be sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0099] Based on the same inventive concept, an embodiment of the present application also provides a range hood noise reduction device for implementing the above-mentioned range hood noise reduction method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the range hood noise reduction device provided below can refer to the limitations on the range hood noise reduction method in the above text, and will not be repeated here.

[0100] In an exemplary embodiment, as Figure 5 shown, a range hood noise reduction device 500 is provided, which is applied to the above-mentioned range hood device 200. The device includes: a data collection module 510, a first signal analysis module 520, a second signal analysis module 530, and a signal playback module 540, where:

[0101] The data collection module 510 is configured to receive the sound signal sent by the sound collection device when the range hood device is operating.

[0102] The first signal analysis module 520 is configured to determine the expected sound signal at the sound receiving end of the sound signal transmission according to the sound signal and a preset first transfer function, and determine the reverse expected sound signal of the expected sound signal.

[0103] A second signal analysis module 530, configured to determine a target sound signal according to a reverse expected signal and a preset second transfer function.

[0104] A signal playback module 540, configured to control a speaker to play the target sound signal.

[0105] Each module in the above-mentioned range hood noise reduction device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor in the computer device in hardware form or be independent of the processor, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0106] In an exemplary embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 6 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as sound signals collected by the sound collection device. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a range hood noise reduction method.

[0107] Those skilled in the art can understand that Figure 6 the structure shown in

[0108] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, it implements the steps in the above-mentioned range hood noise reduction method embodiment.

[0109] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the embodiment of the above-mentioned noise reduction method for the range hood are implemented.

[0110] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the embodiment of the above-mentioned noise reduction method for the range hood are implemented.

[0111] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0112] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0113] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0114] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A noise reduction device, characterized in that: The noise reduction device includes at least two side beams, a fixing interface, a support plate, a sound collection device and a speaker. The fixing interface and each of the side beams are connected to the support plate through a connecting rod. The speaker and the sound collection device are respectively arranged on different side beams. The sound signal output by the speaker and the sound signal collected by the sound collection device interfere and cancel each other at the sound receiving end.

2. The noise reduction device according to claim 1, characterized in that: The noise reduction device further includes a controller, which is disposed on the support plate and connected to the sound collection device and the speaker.

3. The noise reduction device according to claim 2, characterized in that: The support plate is provided with an opening, and the controller is connected to the support plate through the opening.

4. The noise reduction device according to claim 1, characterized in that: The fixing interface is a screw hole structure.

5. The noise reduction device according to claim 1, characterized in that: The sound collecting device includes a microphone.

6. The noise reduction device according to any one of claims 1 to 5, characterized in that: The number of the side beams is two.

7. A range hood device, characterized in that: The range hood equipment includes a range hood body and a noise reduction device as described in any one of claims 1 to 6, wherein the noise reduction device is suspended in the range hood body, and the sound collection device of the noise reduction device is used to collect sound signals generated when the fan of the range hood body is working.

8. The range hood device according to claim 7, characterized in that: The speaker of the noise reduction device is located in the shell of the range hood body, the shell is provided with an opening, and the speaker faces the opening of the shell.

9. The range hood device according to claim 8, characterized in that: The size of the opening of the housing is larger than the size of the speaker.

10. The range hood device according to any one of claims 7 to 9, characterized in that: The controller of the noise reduction device is also used to perform off-line calibration on the sound transfer function between the fan end, the speaker end and the sound receiving end.

11. A method for reducing noise of a range hood, characterized in that: The method is applied to the range hood device according to any one of claims 7 to 10, and the method comprises: When the range hood device is running, receiving the sound signal sent by the sound collection device; Determine, according to the sound signal and a preset first transfer function, an expected sound signal at a sound receiving end after the sound signal is transmitted to the sound receiving end, and determine an inverse expected sound signal of the expected sound signal; Determining a target sound signal according to the reverse expected signal and a preset second transfer function; The loudspeaker is controlled to play the target sound signal.

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