CN113554998A - Active noise reduction device, indoor electrical appliance system and active noise reduction method - Google Patents
Active noise reduction device, indoor electrical appliance system and active noise reduction method Download PDFInfo
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
Abstract
The application discloses device, indoor electrical system and the method of making an uproar fall in initiative, falls the device and includes in the initiative wherein: the environment information acquisition component is used for acquiring the environment information of the room where the indoor electric appliance is located; the first noise collector is used for collecting noise generated by the indoor electric appliance to generate corresponding noise information; the controller is coupled with the environment information acquisition component and the first noise collector to acquire resonance frequency information of the room according to the environment information of the room and further generate corresponding noise reduction information according to the resonance frequency information and the noise information; and the first loudspeaker is coupled with the controller and used for receiving the noise reduction information and sending out corresponding noise reduction sound waves according to the noise reduction information so as to reduce the noise of the indoor electric appliance. By means of the method, the resonance frequency information of the room where the indoor electric appliance is located can be comprehensively considered, and the noise reduction effect is improved.
Description
Technical Field
The application relates to the technical field of indoor electrical appliances, in particular to an active noise reduction device, an indoor electrical appliance system and an active noise reduction method.
Background
The noise of indoor electric appliances, such as a range hood frequently used in a kitchen, is mainly caused by the working noise of a motor, the rotation of an impeller cutting air and the impact of the air in a volute. And the existing indoor electrical appliance has large suction force, high negative pressure and large air volume, which causes the noise problem to be particularly prominent.
The noise reduction technology of the indoor electrical appliance commonly used at present comprises a passive noise reduction technology and an active noise reduction technology. The passive noise reduction technology comprises sound absorption treatment, sound insulation treatment and the like; the sound absorption treatment includes absorbing sound energy using a sound absorbing material or a sound absorbing structure, thereby reducing the intensity of noise; the sound insulation treatment is to utilize the rigidity characteristic of the material to enable sound waves to be reflected on a sound insulation member, so that the purpose of blocking sound wave energy transmission is achieved. The passive noise reduction technology is effective for controlling high-frequency noise, and has little effect on controlling medium-frequency and low-frequency noise. However, the noise of the indoor electric appliance is relatively high in the middle and low frequency. Therefore, more and more indoor electric appliances use active noise reduction technology to reduce the middle and low frequency noise. The active noise reduction technology can drive a loudspeaker to emit sound waves with opposite phases and amplitudes to noise through a built-in algorithm so as to achieve the purpose of noise reduction.
However, due to the great difference between the laboratory environment and the user environment, the active noise reduction device and method with good use effect in the laboratory are reduced in use effect in the user environment, and even have no effect.
Disclosure of Invention
The technical problem mainly solved by the application is to provide an active noise reduction device, an indoor electrical appliance system and an active noise reduction method, which can comprehensively consider the resonance frequency information of a room where an indoor electrical appliance is located so as to improve the noise reduction effect.
In order to solve the technical problem, the application adopts a technical scheme that: an active noise reduction device for reducing noise generated by an indoor electric appliance is provided, which comprises: the environment information acquisition component is used for acquiring the environment information of the room where the indoor electric appliance is located; the first noise collector is used for collecting noise generated by the indoor electric appliance to generate corresponding noise information; a controller coupled to the environmental information acquisition component and the first noise collector to obtain resonance frequency information of the room according to the environmental information, and further to generate corresponding noise reduction information according to the resonance frequency information and the noise information; and the first loudspeaker is coupled with the controller and used for receiving the noise reduction information and sending out corresponding noise reduction sound waves according to the noise reduction information so as to reduce the noise of the indoor electric appliance.
Wherein the environment information acquiring component comprises at least one distance sensor for acquiring three-dimensional size information of the room, so that the controller acquires the resonance frequency information according to the three-dimensional size information.
The environment information acquisition component comprises at least one camera or an input interface and is used for acquiring three-dimensional size information of the room, so that the controller can acquire the resonance frequency information according to the three-dimensional size information.
The environment information acquisition component comprises a second noise collector and a second loudspeaker; when the household appliance is in a non-working state, the second loudspeaker is used for emitting a specific sound signal, and the second noise collector is used for collecting the current sound information in the room, so that the controller obtains the resonance frequency information according to the sound information.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided an indoor electrical system comprising an indoor electrical appliance and an active noise reduction device as described in any of the above embodiments.
Wherein, the indoor electric appliance comprises a cigarette making machine.
Wherein the cigarette machine comprises a housing, the environmental information acquisition assembly being located on an outer surface of the housing; the shell comprises an air inlet, an air outlet and an air duct positioned between the air inlet and the air outlet; the first noise collector and the first loudspeaker are arranged on the wall surface of the air duct through which the air flow passes.
In order to solve the above technical problem, another technical solution adopted by the present application is: an active noise reduction method is provided, comprising: the controller receives environmental information of a room where the indoor electric appliance is located, which is acquired by the environmental information acquisition component, and noise information generated by the indoor electric appliance, which is acquired by the first noise collector; acquiring resonance frequency information of the room according to the environment information; generating corresponding noise reduction information according to the resonance frequency information and the noise information; and sending the noise reduction information to a first loudspeaker so that the first loudspeaker emits corresponding noise reduction sound waves to reduce the noise of the indoor electric appliance.
Wherein the noise information includes a first noise signal that is the same as part of the resonance frequency information and a second noise signal that is different from all of the resonance frequency information, and the generating corresponding noise reduction information according to the resonance frequency information and the noise information includes: generating corresponding first control information according to the first noise signal and a first noise suppression algorithm, and generating corresponding second control information according to the second noise signal and a second noise suppression algorithm; and performing superposition processing on the first control information and the second control information to form the noise reduction information.
Wherein, said will fall the information of making an uproar and send to first speaker to make first speaker send the sound wave of making an uproar that corresponds and fall in order to reduce the noise of indoor electrical apparatus, later, still include: receiving a current noise signal acquired by the first noise collector, and judging whether the sound pressure level of the current noise signal is reduced to a preset level; responding to the reduction of the sound pressure level of the current noise signal to a preset level, keeping relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm unchanged, and continuously controlling; and in response to that the sound pressure level of the current noise signal is not reduced to the preset level, adjusting the relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm, and returning to the step of generating corresponding noise reduction information according to the resonance frequency information and the noise information.
Wherein said adjusting said associated parameters in said first noise suppression algorithm and said second noise suppression algorithm comprises: adjusting a phase and a weight coefficient in the first noise suppression algorithm in response to a sound pressure level of a first noise signal in the current noise signal being higher than the preset level; and adjusting a convergence factor and a weight coefficient in the second noise suppression algorithm in response to the sound pressure level of a second noise signal in the current noise signal being higher than the preset level.
Being different from the prior art situation, the beneficial effect of this application is: the active noise reduction device comprises an environmental information acquisition component, the environmental information of a room where an indoor electric appliance is located can be acquired through the environmental information acquisition component, a subsequent controller can acquire resonance frequency information of the room according to the environmental information, and further corresponding noise reduction information can be generated according to the resonance frequency information and the noise information. Since the size and the spatial shape of a room in which the indoor electric appliance is located are variable, low-frequency resonance noise of 50-200Hz is easily caused. The environmental information acquisition component can predict the resonance frequency information of the room where the indoor electric appliance is located, so that the control strategy can be optimized according to the resonance frequency information, and the control effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of an active noise reduction device according to the present application;
FIG. 2 is a schematic diagram of an embodiment of an indoor electronics system according to the present application;
FIG. 3 is a schematic structural diagram of an embodiment of an indoor electrical system installed in a room;
FIG. 4 is a schematic structural diagram of another embodiment of an indoor electrical system according to the present application;
FIG. 5 is a schematic flowchart illustrating an embodiment of an active noise reduction method according to the present application;
fig. 6 is a schematic flowchart of another embodiment of the active noise reduction method according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an active noise reduction device according to the present application. The active noise reduction device can be used for reducing noise generated by indoor appliances (such as kitchen and household range hoods, etc.), and may include an environmental information acquisition assembly 10, a first noise collector 12, a controller 14, and a first speaker 16.
Specifically, the environment information acquiring component 10 is configured to acquire environment information of a room where the indoor electric appliance is located, where the environment information may include three-dimensional size information or sound resonance information of the room where the indoor electric appliance is located. First noise collector 12 is configured to collect noise generated by an indoor electrical appliance to generate corresponding noise information, in this embodiment, first noise collector 12 may be a microphone or the like; in order to collect the noise generated by the indoor electrical appliance as accurately as possible, the first noise collector 12 may be disposed as close to the noise source (e.g., fan assembly, etc.) of the indoor electrical appliance as possible. Controller 14 is coupled to environmental information acquisition assembly 10 and first noise collector 12, for example, controller 14 and environmental information acquisition assembly 10/first noise collector 12 may be electrically connected directly by wire or electrically connected by wireless; the controller 14 may obtain the resonant frequency information of the room according to the environmental information of the room, and further generate corresponding noise reduction information according to the resonant frequency information and the noise information, where the specific processing procedure is described in detail in the following method section. The first speaker 16 is coupled to the controller 14, similarly, the first speaker 16 and the controller 14 may be directly electrically connected in a wired manner, or may be electrically connected in a wireless manner, and the first speaker 16 is mainly configured to receive noise reduction information and emit corresponding noise reduction sound waves according to the noise reduction information to reduce noise of the indoor electrical appliance. In this embodiment, the number of the first speakers 16 may be multiple, and the noise reduction sound waves emitted by different first speakers 16 may also be different.
Because the size and the space shape of a room where the indoor electric appliance is positioned are changeable, low-frequency resonance noise of 50-200Hz is easily caused; the environmental information acquisition component 10 can predict the resonance frequency information of the room where the indoor electrical appliance is located, so that the control strategy can be optimized according to the resonance frequency information, and the control effect is improved.
In one embodiment, the environment information acquiring assembly 10 may include at least one distance sensor for acquiring three-dimensional size information of the room, so that the controller 14 acquires the resonance frequency information according to the three-dimensional size information. The distance sensor may be an acoustic distance sensor, an optical distance sensor (e.g., a laser radar, etc.), an infrared distance sensor, etc., among others. When the room is a cube, the three-dimensional size information may include the maximum length, the maximum width, and the maximum height of the room in the length, width, and height directions, so that the calculation cost may be low and the calculation efficiency may be high; the environmental information acquiring component 10 may directly acquire the length, width and height of the room, or may convert the length, width and height of the room by acquiring information such as a diagonal line of the room. The three-dimensional size information of the room can be conveniently and quickly tested and obtained through the distance sensor. For example, the environmental information acquisition unit 10 includes a distance sensor whose position is adjustable, and the position of the distance sensor is adjusted to obtain three-dimensional size information of the room. For another example, the environment information acquiring assembly 10 includes a plurality of distance sensors, the positions of the plurality of distance sensors may be relatively fixed, the plurality of distance sensors have a preset angle (e.g., 90 ° or the like), and the plurality of distance sensors cooperate with each other to acquire three-dimensional size information of the room.
In yet another embodiment, the environment information acquiring assembly 10 may include at least one camera for acquiring three-dimensional size information of the room, thereby causing the controller to acquire resonance frequency information according to the three-dimensional size information. The camera can conveniently and quickly obtain the three-dimensional imaging of the room, and the three-dimensional size information of the room is obtained through the three-dimensional imaging.
In yet another embodiment, the environmental information acquisition component 10 may include an input interface that may directly receive three-dimensional information actively input by a user. The method has lower hardware cost and is easy to realize.
In yet another embodiment, the environmental information acquisition component 10 includes a second noise collector and a second speaker; when the household appliance is in a non-working state, the second loudspeaker is used for emitting a specific sound signal (for example, white noise), and the second noise collector is used for collecting sound information in the current room, so that the controller obtains resonance frequency information according to the sound information. The resonance frequency information of the room can be accurately and quickly obtained through the second noise collector and the second loudspeaker.
Of course, in other embodiments, the environmental information acquisition component 10 may be other, as long as it can achieve the purpose of acquiring three-dimensional size information or acoustic resonance information of a room.
Referring to fig. 2-3, fig. 2 is a schematic structural diagram of an embodiment of an indoor electrical system according to the present application. Fig. 3 is a schematic structural diagram of an embodiment of the indoor electrical system installed in a room. The indoor electrical system includes an indoor electrical appliance 22 and the active noise reduction device 20 described in any of the above embodiments.
In one embodiment, the active noise reducer 20 may be mounted to the indoor appliance 22, for example, the active noise reducer 20 may be removably or movably or rotatably mounted to the indoor appliance 22. The design mode can integrate the indoor electric appliance system, reduce the occupied area of the indoor electric appliance system and facilitate transportation and installation.
In one application scenario, as shown in FIG. 2, the indoor appliance 22 may be a range hood; the range hood comprises a shell 220, wherein the shell 220 comprises an air inlet 2200, an air outlet 2202 and an air duct (not shown) located between the air inlet 2200 and the air outlet 2202, and the first noise collector 202 and the first loudspeaker 204 are arranged on the wall surface of the air duct through which air flows. The design mode can enable the first noise collector 202 to collect and obtain the noise signals emitted by the indoor electric appliance 22 as accurately as possible, and the noise reduction effect of the first loudspeaker 204 is better. For example, in the present embodiment, a fan assembly is disposed in the air duct of the housing 220, and is used for blowing out the smoke sucked from the air inlet 2200 toward the air outlet 2202, so that the air flow in the air chamber flows rapidly. The fan assembly may include a fan bracket, a volute, a centrifugal wind wheel, etc., and is a main source of noise for the indoor electrical appliance 22, and the first noise collector 202 may be disposed near the fan assembly. In order to emit sound waves well to achieve the noise reduction effect, the first speaker 204 is fixedly disposed inside the housing 220 and is disposed near the air inlet 2200 of the housing 220.
In order to obtain three-dimensional size information of a room in which the indoor electronic appliance 22 is located, the environmental information acquisition assembly 200 may be disposed on an outer surface of the housing 220.
Further, when the environment information acquiring assembly 200 includes a plurality of distance sensors, the plurality of distance sensors have a preset angle therebetween, so as to quickly obtain three-dimensional size information of a room in which the indoor electrical appliance 22 is located. When the indoor electrical appliance system is installed, the preset angles among the plurality of distance sensors can be adjusted and set according to the room layout, so that the plurality of distance sensors can be matched with one another to acquire three-dimensional size information of a room; and once the indoor electrical system is installed and fixed, the preset angles among the plurality of distance sensors are kept fixed.
In one embodiment, when the indoor appliance 22 is disposed in a built-in manner in a room, for example, the left side, the right side, the rear side, and the upper side of the indoor appliance 22 may all be walls or cabinets. At this time, a plurality of distance sensors may be fixedly disposed on the same side surface of the housing 220, for example, the side surface of the housing 220 facing the user, and the plurality of distance sensors have a preset angle therebetween, and size information such as a diagonal line of the room where the indoor electrical appliance 22 is located may be obtained by the plurality of distance sensors, and the length, the width, and the height of the room may be obtained by conversion from the size information.
In yet another embodiment, when the indoor electric appliance 22 is disposed in an open manner in a room, for example, the left side, the right side, the upper side and the lower side of the indoor electric appliance 22 are not covered by the cabinet or the like, as shown in fig. 2, the plurality of distance sensors may also be disposed on the left side, the right side, the upper side, the lower side and the side facing the user of the indoor electric appliance 22. The height of the room can be obtained by the distance sensors positioned at the upper side and the lower side, and the length of the room can be obtained by the distance sensors positioned at the left side and the right side; if the side of the indoor electrical appliance 22 facing away from the user abuts against a wall or a cabinet, the width of the room can be obtained by the distance sensor located on the side facing the user; if the side of the indoor electrical appliance 22 facing away from the user does not abut against the wall or the cabinet, a distance sensor may be further introduced, and the width of the room may be obtained by the distance sensor located on the side facing toward the user and the distance sensor located on the side facing away from the user.
In addition, please refer to fig. 4, fig. 4 is a schematic structural diagram of an indoor electrical system according to another embodiment of the present application. When the environmental information acquiring assembly 200a includes the second noise collector 2000a and the second speaker 2002a, the environmental information acquiring assembly 200a may be fixedly provided at an outer surface of the housing 220 a. For example, the second noise collector 2000a and the second speaker 2002a may be fixedly disposed on the same side surface of the housing 220a, which may be a side surface of the housing 220a facing the user.
Of course, in other embodiments, at least some of the components of the active noise reducer 20 may be separately disposed outside the indoor unit 22. For example, a controller (not shown) may be provided separately from the indoor electric appliance 22. In an application scenario, the controller may be a mobile phone, a computer, or another terminal capable of intelligently controlling a home appliance (e.g., a mini-meter, a majestic, etc.), and the terminal may be preset with program data related to noise reduction, and may be in wired or wireless connection with the environmental information acquisition component 200, the noise collector 202, and the speaker 204. When the environment information acquiring assembly 200 includes an input panel, the input panel may be integrated with the indoor electric appliance 22, or may be integrated with the controller independent from the indoor electric appliance 22.
Referring to fig. 5, fig. 5 is a schematic flow chart of an embodiment of an active noise reduction method according to the present application, including:
s101: the controller receives the environmental information of the room where the indoor electric appliance is located acquired by the environmental information acquisition component and the noise information generated by the indoor electric appliance acquired by the first noise acquirer.
S102: resonance frequency information of the room is obtained from the environmental information.
Specifically, assuming that a room in which the indoor electrical appliance is located is a cube, the environment information acquired by the environment information acquiring component is three-dimensional size information of the room in which the indoor electrical appliance is located, the three-dimensional size information includes a length Lx, a width Ly, and a height Lz, and the resonance frequency information of the room can be acquired according to the following calculation formula.
Wherein, in the above formula, f is a resonance frequency, c is a sound velocity, and the values of the modal ordinal numbers of l, m and N are natural numbers between 1 and N and including 1 and N, and N is a maximum truncated modal ordinal number. For example, in this embodiment, the values of l, m, and n may be 1 and 2, respectively, and 8 results may be obtained through calculation by the above formula and the combination of l, m, and n, where the 8 results may have the same value. That is, information of up to 8 resonance frequencies can be obtained by the above formula.
And after the environmental information acquisition assembly acquires the sound information of the room through the second noise collector and the second loudspeaker, the controller can directly analyze and process the sound information to acquire the resonance frequency information.
S103: and generating corresponding noise reduction information according to the resonance frequency information and the noise information.
Specifically, in the present embodiment, the noise information includes a first noise signal that is the same as the partial resonance frequency information and a second noise signal that is different from all the resonance frequency information, and if the first noise signal is not controlled, it is easy to induce the room to generate acoustic resonance, thereby affecting the control effect of the active noise reduction method.
In one embodiment, the step S103 specifically includes: generating corresponding first control information according to the first noise signal and a first noise suppression algorithm, and generating corresponding second control information according to the second noise signal and a second noise suppression algorithm; the first control information may be equal in amplitude and opposite in phase to the first noise signal, and the second control information may be equal in amplitude and opposite in phase to the second noise signal; and performing superposition processing on the first control information and the second control information to form noise reduction information. In this embodiment, the first noise suppression algorithm and the second noise suppression algorithm may be the well-established FxLMS algorithm in the prior art, and the settings of the related parameters in the first noise suppression algorithm and the second noise suppression algorithm may be the same or different.
S104: and sending the noise reduction information to the first loudspeaker so that the first loudspeaker emits corresponding noise reduction sound waves to reduce the noise of the indoor electric appliance.
Specifically, in this embodiment, the number of the first speakers may be multiple, and the noise reduction sound waves emitted by the multiple first speakers may be different, and may be specifically set according to an actual situation.
Of course, in other embodiments, the first noise collector may also collect the noise signal in real time for correction. Through bidirectional correction and algorithm self-adaptation, the active noise reduction effect is obvious, and the problem of noise increase caused by the change of actual working conditions and environments is solved. For example, as shown in fig. 6, fig. 6 is a schematic flowchart of another embodiment of the active noise reduction method according to the present application. The active noise reduction method comprises the following steps:
s201: the controller receives the environmental information of the room where the indoor electric appliance is located acquired by the environmental information acquisition component and the noise information generated by the indoor electric appliance acquired by the first noise acquirer.
Specifically, the step is the same as step S101 in the above embodiment, and is not described again here.
S202: resonance frequency information of the room is obtained from the environmental information.
Specifically, the step is the same as step S102 in the above embodiment, and is not described herein again.
S203: corresponding first control information is generated according to the first noise signal and the first noise suppression algorithm, and corresponding second control information is generated according to the second noise signal and the second noise suppression algorithm.
Specifically, the first control information may be equal in magnitude and opposite in phase to the first noise signal, and the second control information may be equal in magnitude and opposite in phase to the second noise signal.
S204: and performing superposition processing on the first control information and the second control information to form noise reduction information.
Specifically, in this embodiment, the first noise suppression algorithm and the second noise suppression algorithm may be relatively mature FxLMS algorithm in the prior art, and the settings of the relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm may be the same or different, where the relevant parameters may include phase, weight coefficient, convergence factor, and the like.
S205: and sending the noise reduction information to the first loudspeaker so that the first loudspeaker emits corresponding noise reduction sound waves to reduce the noise of the indoor electric appliance.
Specifically, the step is the same as step S104 in the above embodiment, and is not described herein again.
S206: and receiving the current noise signal collected by the first noise collector, and judging whether the sound pressure level of the current noise signal is reduced to a preset level.
Specifically, the preset level may be set according to an acceptable degree of an actual user.
S207: and in response to the sound pressure level of the current noise signal being reduced to a preset level, keeping relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm unchanged, and continuously controlling.
S208: and in response to the sound pressure level of the current noise signal not being reduced to the preset level, adjusting relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm, and returning to the step S203.
Specifically, the step S208 specifically includes: A. in response to the fact that the sound pressure level of a first noise signal in the current noise signal is higher than a preset level, adjusting the phase and the weight coefficient in a first noise suppression algorithm, wherein the specific adjustment sequence of the phase and the weight coefficient can be that the phase is adjusted first and then the weight coefficient is adjusted; for example, when there is a leading or lagging condition in the phase between the first noise signal in the current noise signal and the current first control information, the phase of the current first control information is adjusted. The weight coefficient may be searched and adjusted in a certain feasible interval, for example, the range of the weight coefficient is [0,10], and the adjustment step is 1. B. In response to that the sound pressure level of a second noise signal in the current noise signal is higher than a preset level, adjusting a convergence factor and a weight coefficient in a second noise suppression algorithm, wherein the specific adjustment sequence of the convergence factor and the weight coefficient can be that the convergence factor is adjusted first and then the weight coefficient is adjusted; the adjustment of the weighting factors in step B is similar to that in step A; the adjustment mode of the convergence factor may be to perform search adjustment in a certain feasible region, the range of the convergence factor may be [0,0.1], and the adjustment step is 0.01. Of course, in other embodiments, the adjustment may also be performed with respect to other related parameters in the first noise suppression algorithm and the second noise suppression algorithm, and the adjustment manner is not limited to the above step a and step B.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (11)
1. An active noise reduction device for reducing noise generated by an indoor appliance, comprising:
the environment information acquisition component is used for acquiring the environment information of the room where the indoor electric appliance is located;
the first noise collector is used for collecting noise generated by the indoor electric appliance to generate corresponding noise information;
a controller coupled to the environmental information acquisition component and the first noise collector to obtain resonance frequency information of the room according to the environmental information, and further to generate corresponding noise reduction information according to the resonance frequency information and the noise information;
and the first loudspeaker is coupled with the controller and used for receiving the noise reduction information and sending out corresponding noise reduction sound waves according to the noise reduction information so as to reduce the noise of the indoor electric appliance.
2. The active noise reduction device of claim 1,
the environment information acquiring component includes at least one distance sensor for acquiring three-dimensional size information of the room, so that the controller acquires the resonance frequency information according to the three-dimensional size information.
3. The active noise reduction device of claim 1,
the environment information acquisition component comprises at least one camera or an input interface and is used for acquiring three-dimensional size information of the room, so that the controller can acquire the resonance frequency information according to the three-dimensional size information.
4. The active noise reduction device of claim 1,
the environment information acquisition component comprises a second noise collector and a second loudspeaker; when the household appliance is in a non-working state, the second loudspeaker is used for emitting a specific sound signal, and the second noise collector is used for collecting the current sound information in the room, so that the controller obtains the resonance frequency information according to the sound information.
5. An indoor electrical system comprising an indoor electrical appliance and an active noise reduction device as claimed in any one of claims 1 to 4.
6. Indoor electrical system according to claim 5,
the indoor electric appliance comprises a range hood.
7. Indoor electrical system according to claim 6,
the cigarette making machine comprises a shell, wherein the environment information acquisition assembly is positioned on the outer surface of the shell; the casing includes air intake, air outlet and is located the air intake with the wind channel between the air outlet, first noise collector with first speaker set up in on the wall of wind channel and air current process.
8. An active noise reduction method, comprising:
the controller receives environmental information of a room where the indoor electric appliance is located, which is acquired by the environmental information acquisition component, and noise information generated by the indoor electric appliance, which is acquired by the first noise collector;
acquiring resonance frequency information of the room according to the environment information;
generating corresponding noise reduction information according to the resonance frequency information and the noise information;
and sending the noise reduction information to a first loudspeaker so that the first loudspeaker emits corresponding noise reduction sound waves to reduce the noise of the indoor electric appliance.
9. The active noise reduction method according to claim 8, wherein the noise information includes a first noise signal that is the same as part of the resonance frequency information and a second noise signal that is different from all of the resonance frequency information, and the generating corresponding noise reduction information according to the resonance frequency information and the noise information includes:
generating corresponding first control information according to the first noise signal and a first noise suppression algorithm, and generating corresponding second control information according to the second noise signal and a second noise suppression algorithm;
and performing superposition processing on the first control information and the second control information to form the noise reduction information.
10. The active noise reduction method according to claim 9, wherein the sending the noise reduction information to a first speaker to make the first speaker emit corresponding noise reduction sound waves to reduce the noise of the indoor electrical appliance, and then further comprises:
receiving a current noise signal acquired by the first noise collector, and judging whether the sound pressure level of the current noise signal is reduced to a preset level;
responding to the reduction of the sound pressure level of the current noise signal to a preset level, keeping relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm unchanged, and continuously controlling;
and in response to that the sound pressure level of the current noise signal is not reduced to the preset level, adjusting the relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm, and returning to the step of generating corresponding noise reduction information according to the resonance frequency information and the noise information.
11. The active noise reduction method of claim 10, wherein said adjusting the relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm comprises:
adjusting a phase and a weight coefficient in the first noise suppression algorithm in response to a sound pressure level of a first noise signal in the current noise signal being higher than the preset level;
and adjusting a convergence factor and a weight coefficient in the second noise suppression algorithm in response to the sound pressure level of a second noise signal in the current noise signal being higher than the preset level.
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| CN202010335194.6A CN113554998B (en) | 2020-04-24 | 2020-04-24 | Active noise reduction device, indoor electrical system and active noise reduction method |
| PCT/CN2020/136219 WO2021212877A1 (en) | 2020-04-24 | 2020-12-14 | Active noise reduction device, indoor electrical appliance system and active noise reduction method |
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| WO2021212877A1 (en) | 2021-10-28 |
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