CN113554998B - Active noise reduction device, indoor electrical system and active noise reduction method - Google Patents
Active noise reduction device, indoor electrical system and active noise reduction method Download PDFInfo
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- CN113554998B CN113554998B CN202010335194.6A CN202010335194A CN113554998B CN 113554998 B CN113554998 B CN 113554998B CN 202010335194 A CN202010335194 A CN 202010335194A CN 113554998 B CN113554998 B CN 113554998B
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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
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Abstract
The application discloses an active noise reduction device, an indoor electrical system and an active noise reduction method, wherein the active noise reduction device comprises: the environment information acquisition component is used for acquiring the environment information of the room in which the indoor electrical appliance is located; the first noise collector is used for collecting noise generated by the indoor electrical 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 generates 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 electrical appliance. Through the mode, the application can comprehensively consider the resonance frequency information of the room where the indoor electrical appliance is located, so as to improve the noise reduction effect.
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
Indoor appliances, such as range hoods, which are often used in kitchens, have noise mainly caused by motor operation noise, impeller rotation cutting air, and air striking in the volute. And the existing indoor electrical appliance has large suction force, high negative pressure and large air quantity, so that the noise problem is particularly remarkable.
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. Wherein, 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 sound absorbing structure, thereby reducing noise intensity; the sound insulation treatment is to reflect sound waves on the sound insulation member by utilizing the rigidity characteristics of the material, so that the purpose of resisting the propagation of sound insulation wave energy is achieved. The passive noise reduction technology is effective in controlling high-frequency noise, and has little control effect on medium-low frequency noise. However, among the components of the noise of the indoor electric appliances, the noise of the middle and low frequencies is rather large. Therefore, more and more indoor appliances use active noise reduction technology to reduce 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 the active noise reduction method with good use effect in the laboratory are caused, and the use effect is reduced or even not effective in the user environment.
Disclosure of Invention
The application mainly solves the technical problem of providing an active noise reduction device, an indoor electrical system and an active noise reduction method, which can comprehensively consider the resonance frequency information of a room where an indoor electrical is located so as to improve the noise reduction effect.
In order to solve the technical problems, the application adopts a technical scheme that: an active noise reduction device is provided, which is used for reducing noise generated by an indoor electrical appliance, and comprises: the environment information acquisition component is used for acquiring the environment information of the room where the indoor electrical appliance is located; the first noise collector is used for collecting noise generated by the indoor electrical 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, and further generates corresponding noise reduction information according to the resonance frequency information and the noise information; and the first loudspeaker is coupled with the controller and is 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 electrical appliance.
The environment information acquisition component comprises at least one distance sensor and is used for acquiring three-dimensional size information of the room, and further the controller is enabled to acquire 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, and further the controller is enabled to 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; and 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 technical problems, the application adopts another technical scheme that: an indoor electrical appliance system is provided, including an indoor electrical appliance and the active noise reduction device described in any of the above embodiments.
Wherein, indoor electrical apparatus includes the cigarette machine.
The smoke machine comprises a shell, wherein the environment information acquisition component is positioned on the outer surface of the shell; the shell comprises an air inlet, an air outlet and an air channel 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 technical problems, the application adopts another technical scheme that: provided is an active noise reduction method, comprising: the controller receives the environmental information of the room in which the indoor electric appliance is located, which is acquired by the environmental information acquisition component, and the noise information generated by the indoor electric appliance, which is acquired by the first noise acquisition component; obtaining 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 sends out corresponding noise reduction sound waves to reduce the noise of the indoor electrical appliance.
The noise information includes a first noise signal identical to a part of the resonance frequency information and a second noise signal 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 carrying out superposition processing on the first control information and the second control information to form the noise reduction information.
The noise reduction information is sent to a first speaker, so that the first speaker sends out corresponding noise reduction sound waves to reduce noise of the indoor electrical appliance, and then the method further comprises the following steps: receiving a current noise signal acquired by the first noise acquisition unit, and judging whether the sound pressure level of the current noise signal is reduced to a preset level; in response to the sound pressure level of the current noise signal being reduced to a preset level, maintaining relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm unchanged and continuously controlling; and in response to the sound pressure level of the current noise signal not decreasing 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 correlation 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.
Different from the prior art, the application has the following beneficial effects: the active noise reduction device provided by the application comprises an environment information acquisition component, the environment information of a room in which an indoor electric appliance is positioned can be acquired through the environment information acquisition component, the follow-up controller can acquire resonance frequency information of the room according to the environment information, and corresponding noise reduction information can be further generated according to the resonance frequency information and the noise information. Because the room size and the space shape of the indoor electric appliance are varied, low-frequency resonance noise of 50-200Hz is easy to be caused. The environment information acquisition component 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.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of an active noise reduction device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an embodiment of an indoor electrical system according to the present application;
fig. 3 is a schematic structural diagram of a later embodiment of the indoor electrical system disposed in a room;
FIG. 4 is a schematic view of another embodiment of the indoor electrical system of the present application;
FIG. 5 is a flow chart of an embodiment of an active noise reduction method according to the present application;
fig. 6 is a flow chart of another embodiment of the active noise reduction method of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an active noise reduction device according to an embodiment of the application. The active noise reduction device may be used to reduce noise generated by indoor appliances (e.g., kitchen household range hoods, etc.), which may include an environmental information acquisition component 10, a first noise collector 12, a controller 14, a first speaker 16.
Specifically, the environment information acquiring component 10 is configured to acquire environment information of a room in which an indoor appliance is located, where the environment information may include three-dimensional size information or sound resonance information of the room. The first noise collector 12 is configured to collect noise generated by an indoor electrical appliance to generate corresponding noise information, and in this embodiment, the first noise collector 12 may be a microphone or the like; in order to collect noise generated from the indoor electric appliances as accurately as possible, the first noise collector 12 may be disposed as close to noise sources (e.g., fan assemblies, etc.) of the indoor electric appliances as possible. The controller 14 is coupled to the environmental information acquisition component 10 and the first noise collector 12, for example, the controller 14 and the environmental information acquisition component 10/the first noise collector 12 may be directly and electrically connected through a wired manner or may be electrically connected through a wireless manner; the controller 14 may obtain the resonance frequency information of the room according to the environmental information of the room, and further generate corresponding noise reduction information according to the resonance frequency information and the noise information, and the specific processing procedure will be described in detail in the following method section. The first speaker 16 is coupled to the controller 14, and similarly, the first speaker 16 and the controller 14 may be directly electrically connected through a wired mode or may be electrically connected through a wireless mode, and the first speaker 16 is mainly configured to receive noise reduction information and send out corresponding noise reduction sound waves according to the noise reduction information so as to reduce noise of an indoor electrical appliance. In this embodiment, the number of the first speakers 16 may be plural, and noise reduction sound waves emitted from different first speakers 16 may be different.
Because the room size and the space shape of the indoor electrical appliance are varied, low-frequency resonance noise of 50-200Hz is easy to be caused; the environment information obtaining 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 can be improved.
In one embodiment, the environmental information acquisition component 10 may include at least one distance sensor for acquiring three-dimensional size information of the room such that the controller 14 obtains resonance frequency information from the three-dimensional size information. The distance sensor may be an acoustic wave distance sensor, an optical distance sensor (e.g., lidar, etc.), an infrared distance sensor, etc. When the room is a cube, the three-dimensional size information can comprise the maximum length, the maximum width and the maximum height of the room in the length-width-height direction, so that the calculation cost is lower and the calculation efficiency is higher; the environmental information acquisition component 10 may directly acquire the length, width, and height of the room, or may acquire the length, width, and height of the room by obtaining information conversion such as the diagonal line of the room. The three-dimensional size information of the room can be conveniently and rapidly obtained through testing by the distance sensor. For example, the environmental information acquisition component 10 includes a distance sensor whose position is adjustable, and three-dimensional size information of the room is obtained by adjusting the position of the distance sensor. For another example, the environmental information-obtaining component 10 includes a plurality of distance sensors, the positions of which may be relatively fixed, and a preset angle (for example, 90 °) is provided between the plurality of distance sensors, and the plurality of distance sensors cooperate with each other to obtain three-dimensional size information of the room.
In yet another embodiment, the environmental information acquisition component 10 may include at least one camera for acquiring three-dimensional size information of the room, thereby enabling the controller to obtain resonance frequency information according to the three-dimensional size information. The three-dimensional imaging of the room can be conveniently and rapidly obtained through the camera, and the three-dimensional size information of the room can be obtained through the three-dimensional imaging.
In yet another embodiment, the environmental information acquisition component 10 can include an input interface that can directly receive three-dimensional size information actively entered by a user. The method has low 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; the second speaker is for emitting a specific sound signal (e.g., white noise) when the home appliance is in a non-operating state, and the second noise collector is for collecting sound information in the current room, so that the controller obtains resonance frequency information according to the sound information. The resonant frequency information of the room can be accurately and rapidly obtained through the second noise collector and the second loudspeaker.
Of course, in other embodiments, the environmental information-obtaining component 10 may be other as long as it can achieve the purpose of obtaining three-dimensional size information or sound 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 a later embodiment of the indoor electrical system disposed in a room. The indoor electrical system includes an indoor electrical appliance 22 and the active noise reducer 20 described in any of the embodiments above.
In one embodiment, the active noise reducer 20 may be mounted on the indoor appliance 22, for example, the active noise reducer 20 may be detachably or movably or rotatably disposed on the indoor appliance 22. The design mode can integrate the indoor electrical appliance system, reduces the occupied area of the indoor electrical appliance system, and is convenient to transport and install.
In one application scenario, as shown in fig. 2, the indoor appliance 22 may be a smoke machine; the smoke machine includes a housing 220, the housing 220 includes an air inlet 2200, an air outlet 2202, and an air duct (not shown) between the air inlet 2200 and the air outlet 2202, and the first noise collector 202 and the first speaker 204 are disposed on a wall surface of the air duct through which air flows. The design manner can make the first noise collector 202 collect and obtain the noise signal 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, so as to blow the smoke sucked from the air inlet 2200 toward the air outlet 2202, so that the airflow in the ventilation cavity flows rapidly. The fan assembly may include a fan bracket, a volute, a centrifugal wind wheel, etc., and is a primary source of noise for the indoor appliance 22, at which point the first noise collector 202 may be disposed proximate to the fan assembly. In order to better emit sound waves 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 facilitate obtaining three-dimensional size information of a room in which the indoor electric appliance 22 is located, the environmental information-obtaining assembly 200 may be provided on an outer surface of the housing 220.
Further, when the environmental information acquisition assembly 200 includes a plurality of distance sensors, the plurality of distance sensors have a preset angle therebetween so as to rapidly acquire three-dimensional size information of a room in which the indoor electric appliance 22 is located. When the indoor electrical system is installed, the preset angles among the plurality of distance sensors can be adjusted and set according to the layout of the room, so that the plurality of distance sensors are matched with each other to acquire three-dimensional size information of the room; and once the indoor electrical system is installed and fixed, the preset angle between the plurality of distance sensors is kept fixed.
In one embodiment, when the indoor appliance 22 is provided in a built-in manner in a room, for example, the left, right, rear, upper sides of the indoor appliance 22 may all be walls or cabinets. At this time, a plurality of distance sensors may be fixedly provided on the same side surface of the housing 220, for example, the side surface of the housing 220 facing the user, with a preset angle therebetween, and size information such as a diagonal line of the room in which the indoor electric appliance 22 is located may be obtained through the plurality of distance sensors, and the length, width, and height of the room may be converted through the size information.
In still another embodiment, when the indoor electric appliance 22 is disposed in an open manner in a room, for example, when the left, right, upper, and lower sides of the indoor electric appliance 22 are not shielded by a cabinet or the like, as shown in fig. 2, a plurality of distance sensors may be disposed at the left, right, upper, and lower sides of the indoor electric appliance 22, respectively, and toward the user side. The height of the room can be obtained by the distance sensors located at the upper and lower sides, and the length of the room can be obtained by the distance sensors located at the left and right sides; if the side of the indoor electric appliance 22 facing away from the user is abutted against a wall or a cabinet body, the width of the room can be obtained through the distance sensor positioned on the side facing the user; if the side of the indoor electric appliance 22 facing away from the user is not abutted against the wall or the cabinet, a distance sensor can be further introduced, and the width of the room can be obtained through the distance sensor positioned on the side facing the user and the distance sensor positioned on the side facing away from the user.
In addition, referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the indoor electrical system according to the present application. When the environmental information-obtaining member 200a includes the second noise collector 2000a and the second speaker 2002a, the environmental information-obtaining member 200a may be fixedly provided to the 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 elements of the active noise reducer 20 may be disposed separately outside the indoor appliance 22. For example, a controller (not shown) may be provided separately from the indoor electric appliance 22. In one application scenario, the controller may be a mobile phone, a computer, or other terminals capable of intelligently controlling home appliances (e.g., a small scale, a kitten's smart, etc.), and the terminals may be preset with program data related to noise reduction, and may establish a wired or wireless connection with the environmental information acquisition component 200, the noise collector 202, and the speaker 204. When the environmental information-obtaining component 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 of the indoor electric appliance 22.
Referring to fig. 5, fig. 5 is a flow chart illustrating an active noise reduction method according to an embodiment of the application, including:
s101: the controller receives the environmental information of the room where the indoor electric appliance is located and the noise information generated by the indoor electric appliance and acquired by the first noise acquisition unit.
S102: resonance frequency information of the room is obtained from the environmental information.
Specifically, assuming that the room in which the indoor electric 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 electric appliance is located, the three-dimensional size information includes a length Lx, a width Ly and a height Lz, and resonance frequency information of the room can be obtained according to the following calculation formula.
Wherein f is the resonant frequency, c is the sound velocity, l, m, N are the modal numbers, the values are between 1 and N and include natural numbers of 1 and N, and N is the maximum truncated modal 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 by calculation through the above formula and the combination of l, m, and n, where the results with the same values may exist in the 8 results. I.e. up to 8 resonance frequency information can be obtained by the above formula.
And after the environmental information acquisition component acquires the sound information of the room through the second noise collector and the second loudspeaker, the controller can directly analyze 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 identical to a part of the resonance frequency information and a second noise signal different from all of the resonance frequency information, and if the first noise signal is not controlled, the sound resonance is easily induced in the room, 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 the first noise suppression algorithm, and generating corresponding second control information according to the second noise signal and the 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 FxLMS algorithms that are relatively mature in the prior art, and relevant parameter settings 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 sends out corresponding noise reduction sound waves to reduce the noise of the indoor electrical appliance.
Specifically, in this embodiment, the number of the first speakers may be plural, and noise reduction sound waves emitted by the plural first speakers may be different, and may be specifically set according to actual situations.
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-adaption, the active noise reduction effect is obvious, and the problem that noise is increased due to the change of actual working conditions and environments is avoided. For example, as shown in fig. 6, fig. 6 is a flow chart of another embodiment of the active noise reduction method of 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 and the noise information generated by the indoor electric appliance and acquired by the first noise acquisition unit.
Specifically, this step is the same as step S101 in the above embodiment, and will not be described here again.
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 will not be described here 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 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.
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 FxLMS algorithms that are relatively mature in the prior art, and relevant parameter settings in the first noise suppression algorithm and the second noise suppression algorithm may be the same or different, where the relevant parameters may include a phase, a weight coefficient, a convergence factor, and the like.
S205: and sending the noise reduction information to the first loudspeaker so that the first loudspeaker sends out corresponding noise reduction sound waves to reduce the noise of the indoor electrical appliance.
Specifically, the step is the same as step S104 in the above embodiment, and will not be described here again.
S206: and receiving the current noise signal acquired by the first noise acquisition unit, 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 actual user acceptable level.
S207: and responding to the sound pressure level of the current noise signal to be 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 decreasing to the preset level, adjusting relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm, and returning to step S203.
Specifically, the step S208 specifically includes: A. in response to the sound pressure level of the first noise signal in the current noise signal being higher than a preset level, adjusting the phase and the weight coefficient in the first noise suppression algorithm, wherein the adjustment sequence of the specific 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 lead or lag condition in 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 can be searched and adjusted in a certain feasible interval, for example, the range of the weight coefficient is [0,10], and the adjustment step length is 1. B. In response to the sound pressure level of the second noise signal in the current noise signal being higher than a preset level, adjusting a convergence factor and a weight coefficient in the second noise suppression algorithm, wherein the 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 mode of the weight factors in the step B is similar to that in the step A; the adjustment mode of the convergence factor can be search adjustment in a certain feasible area, the range of the convergence factor can be [0,0.1], and the adjustment step is 0.01. Of course, in other embodiments, other relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm may be adjusted, and the adjustment manner is not limited to the above-mentioned step a and step B.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.
Claims (10)
1. An active noise reduction device for reducing noise generated by an indoor electrical appliance, comprising:
the environment information acquisition component is used for acquiring the environment information of the room where the indoor electrical appliance is located;
the first noise collector is used for collecting noise generated by the indoor electrical 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, and further generates corresponding noise reduction information according to the resonance frequency information and the noise information;
the first loudspeaker is coupled with the controller and is 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 electrical appliance;
wherein the environmental information includes three-dimensional size information of the room.
2. The active noise reduction device of claim 1,
the environmental information acquisition component includes at least one distance sensor for acquiring three-dimensional size information of the room, such 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. An indoor electrical appliance system comprising an indoor electrical appliance and the active noise reduction device of any one of claims 1-3.
5. The indoor electrical system according to claim 4, wherein,
the indoor electrical appliance comprises a smoke machine.
6. The indoor electrical system according to claim 5, wherein,
the smoke machine comprises a shell, wherein the environment information acquisition component is positioned on the outer surface of the shell; the shell comprises an air inlet, an air outlet and an air channel positioned between the air inlet and the air outlet, and the first noise collector and the first loudspeaker are arranged on the wall surface of the air channel through which air flows.
7. An active noise reduction method, comprising:
the controller receives the environmental information of the room in which the indoor electric appliance is located, which is acquired by the environmental information acquisition component, and the noise information generated by the indoor electric appliance, which is acquired by the first noise acquisition component;
obtaining 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;
the noise reduction information is sent to a first loudspeaker, so that the first loudspeaker sends out corresponding noise reduction sound waves to reduce the noise of the indoor electrical appliance;
wherein the environmental information includes three-dimensional size information of the room.
8. The active noise reduction method according to claim 7, wherein the noise information includes a first noise signal identical to a part of the resonance frequency information and a second noise signal different from all of the resonance frequency information, and the generating the 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 carrying out superposition processing on the first control information and the second control information to form the noise reduction information.
9. The method of active noise reduction according to claim 8, wherein the transmitting the noise reduction information to a first speaker causes the first speaker to emit a corresponding noise reduction sound wave to reduce noise of the indoor appliance, and then further comprising:
receiving a current noise signal acquired by the first noise acquisition unit, and judging whether the sound pressure level of the current noise signal is reduced to a preset level;
in response to the sound pressure level of the current noise signal being reduced to a preset level, maintaining relevant parameters in the first noise suppression algorithm and the second noise suppression algorithm unchanged and continuously controlling;
and in response to the sound pressure level of the current noise signal not decreasing 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.
10. The active noise reduction method of claim 9, wherein the adjusting the correlation 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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| CN114216145B (en) * | 2021-12-14 | 2023-03-24 | 宁波方太厨具有限公司 | Fan cleaning device for range hood, range hood and control method |
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