CN113689841B - Noise reduction methods for range hoods - Google Patents

Noise reduction methods for range hoods Download PDF

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CN113689841B
CN113689841B CN202110770730.XA CN202110770730A CN113689841B CN 113689841 B CN113689841 B CN 113689841B CN 202110770730 A CN202110770730 A CN 202110770730A CN 113689841 B CN113689841 B CN 113689841B
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noise
range hood
signal
optimal
microphone
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CN113689841A (en
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时璐璐
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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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
    • 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
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention relates to a noise reduction method of a range hood, which comprises the steps of obtaining a reference noise signal of the range hood in a reference stable working condition in an actual installation environment, obtaining a microphone reference installation position and a loudspeaker reference installation position when the reference noise signal reaches an optimal noise reduction effect, obtaining a feedback transfer function for a user, respectively obtaining a noise transfer function and a loudspeaker error function of the range hood in each stable working condition in a debugging state, obtaining a loudspeaker noise elimination signal to be transmitted for the noise signal at the optimal installation position of the microphone in the stable working condition, adjusting the loudspeaker noise elimination signal to be transmitted by the loudspeaker error function, obtaining an adjusted loudspeaker noise elimination signal to be transmitted, and finally releasing the adjusted loudspeaker noise elimination signal to be transmitted by the loudspeaker, thereby realizing the active noise reduction effect on the noise signal generated by the range hood in the current stable working condition.

Description

Noise reduction method of range hood
Technical Field
The invention relates to the field of range hoods, in particular to a noise reduction method of a range hood.
Background
The range hood is a necessary device for most home kitchens, and usually generates noise when working, so that the use experience effect of users is affected. In order to reduce adverse effects of noise generated when the range hood works on users, an active noise reduction method (or active noise reduction method) is mainly adopted to perform noise reduction treatment at present.
The existing active noise reduction method is mainly characterized in that a noise collector, a sound signal generator and a loudspeaker device for collecting the whole noise of the range hood are additionally arranged on the basis of the existing range hood structure, the noise collector collects the whole noise of the range hood as a reference noise source and sends the collected noise to the sound signal generator, then the sound signal generator generates sound wave signals with the same amplitude and opposite phases with the whole noise of the range hood according to the whole noise of the range hood collected by the noise collector, and the loudspeaker device broadcasts the sound wave signals, so that the sound wave signals counteract the whole noise of the range hood, and the noise reduction effect is achieved.
The Chinese patent application CN107289482A discloses a self-learning automatic noise reduction system and a self-learning automatic noise reduction method for a range hood, wherein the self-learning automatic noise reduction system for the range hood comprises a range hood, a microphone and a loudspeaker are arranged on the range hood, and a CPU (Central processing Unit) of the range hood is respectively and electrically connected with a signal processing module, a self-learning Xi Jiangzao algorithm module and a pre-calibration module. The self-learning automatic noise reduction method for the range hood mainly comprises the following steps of: (1) After the cigarette making machine is installed in the home of a user, the cigarette making machine operates in different rotating speed sections; (2) Collecting the noise of the smoke machine and the environmental noise of different rotating speed sections through a microphone, and feeding back the collected measured data to a signal processing module on the smoke machine; (3) The self-learning Xi Jiangzao algorithm module generates corresponding sound waveforms according to the preset reference data in the pre-calibration module and by combining actual measurement data of the smoke machine noise and the environmental noise; (4) The sound waveform is output through a speaker to cancel most of the noise.
However, the self-learning automatic noise reduction method for the range hood disclosed in the patent application CN107289482a has the following defects: the microphone and the loudspeaker are fixed at the mounting positions inside the range hood, and as the range of rotation of the fan of the range hood is different under different working conditions due to different working conditions of the range hood, the optimal mounting positions of the microphone and the loudspeaker which are required to be matched for noise reduction under different range of rotation of the fan are different, so that the self-learning automatic noise reduction scheme can only reduce noise generated by the range hood under individual working conditions, cannot reduce noise generated by the range hood under all working conditions, namely cannot respectively reduce noise generated by the range hood under different working conditions.
Disclosure of Invention
The invention aims to provide a noise reduction method of a range hood aiming at the prior art. The noise reduction method can automatically adjust the noise reduction signals to be generated according to different working conditions of the range hood when the range hood is in operation, so that the active noise reduction effect on the noise signals generated by the range hood under different stable working conditions is realized.
The technical scheme adopted for solving the technical problems is as follows: the noise reduction method of the range hood is characterized by comprising the following steps of:
step 1, selecting any range hood in an actual installation environmentThe method comprises the steps that a stable working condition is used as a reference stable working condition, a noise signal generated by the range hood when the range hood is in the reference stable working condition is obtained in advance, and the noise signal is used as a reference noise signal; wherein, the reference noise signal of the range hood is marked as V 0 (t)，t>0；
Step 2, obtaining a microphone optimal installation position and a loudspeaker optimal installation position corresponding to the noise reduction effect of the reference noise signal reaching the optimal effect in advance, wherein the microphone optimal installation position is taken as a microphone reference installation position and the loudspeaker optimal installation position is taken as a loudspeaker reference installation position; wherein the microphone reference mounting position is marked as S 0, wheat The reference mounting position of the loudspeaker is marked as S 0, ；
Step 3, pre-collecting noise signals of at least one user corresponding to the range hood in the reference stable working condition, and taking the noise signals of any user at the ear position as feedback signals; wherein, the noise signal of the ear position of any user corresponding to the range hood under the reference stable working condition is marked as V Ear (t)；
Step 4, according to the reference noise signal and the feedback signal, processing to obtain a feedback transfer function in the process of transferring the noise signal generated by the range hood from the optimal mounting position of the microphone to the ear of any user; wherein the feedback transfer function is denoted as M (V 0 (t),V Ear (t))；
Step 5, respectively obtaining a microphone optimal installation position, a loudspeaker optimal installation position, a noise signal at the microphone optimal installation position, a noise elimination signal emitted by a loudspeaker at the loudspeaker optimal installation position and a noise signal at the microphone reference installation position, which correspond to the noise reduction effect of the noise signal generated when the range hood is under each stable working condition in a debugging state and reach an optimal effect in advance;
the method comprises the steps of marking the optimal mounting position mark of a microphone corresponding to the noise reduction effect of a noise signal generated by the range hood in the nth stable working condition in the debugging state when the noise reduction effect of the noise signal generated by the range hood in the nth stable working condition in the debugging state reaches the optimal effect, wherein the marked range hood has the N stable working conditions in the debugging stateIs S n, wheat The optimal installation position of the loudspeaker corresponding to the condition that the noise reduction effect of the noise signal generated by the range hood under the nth stable working condition under the debugging state reaches the optimal effect is marked as S n, Optimum mounting position S of speaker n, The noise elimination signal emitted by the loudspeaker is marked asNoise signals at the best mounting positions of the microphones corresponding to the noise reduction effect of noise signals generated by the range hood under the nth stable working condition in the debugging state reaching the optimal effect are marked as + ->Noise signal mark of microphone reference installation position of range hood in nth stable working condition under debugging state is +.>N is more than or equal to 1 and less than or equal to N; the reference stable working condition of the range hood in the actual installation environment is different from each stable working condition in the debugging state;
step 6, respectively obtaining a noise transfer function from the microphone optimal mounting position to the microphone reference mounting position of the corresponding noise signal under the stable working conditions in the debugging state according to the obtained noise signal at the microphone optimal mounting position of the range hood under the stable working conditions in the debugging state and the obtained noise signal at the microphone reference mounting position under the stable working conditions; wherein, in the nth stable working condition under the debugging state, the noise signal is transmitted from the optimal installation position S of the microphone n, wheat To microphone reference mounting position S 0, wheat The noise transfer function of (c) is denoted H (n, S),
step 7, according to the best installation position of the loudspeaker, the noise elimination signal emitted by the loudspeaker at the best installation position of the loudspeaker and the loudspeaker reference when the obtained range hood is in each stable working condition in the debugging stateA loudspeaker at the installation position is respectively processed to obtain a loudspeaker error function of each stable working condition of the range hood in a debugging state; wherein, the error function of the loudspeaker under the nth stable working condition of the range hood in the debugging state is marked as delta A n ＝A(S n )；
Step 8, obtaining a noise signal at a microphone reference installation position corresponding to the range hood in any stable working condition under an actual installation environment, and calculating to obtain a noise signal at an optimal microphone installation position corresponding to any stable working condition according to a noise transfer function in any stable working condition and the obtained noise signal at the microphone reference installation position; wherein, the arbitrary stable working condition of the range hood in the actual installation environment is marked as n ', and the noise signal at the reference installation position of the corresponding microphone in the arbitrary stable working condition n' is marked asThe noise signal mark at the optimal installation position of the microphone corresponding to any stable working condition n' is +.>And (F)>
Step 9, obtaining a noise elimination signal to be emitted of the loudspeaker for noise reduction aiming at the noise signal at the optimal mounting position of the microphone according to the noise signal at the optimal mounting position of the microphone corresponding to any stable working condition; wherein for noise signals at the optimum mounting position of the microphoneA noise elimination signal to be emitted by the loudspeaker for noise reduction is marked as A n' (t) the noise cancellation signal A to be emitted by the loudspeaker n' (t) is the noise signal->Equal and opposite amplitude soundsA signal;
step 10, obtaining a noise elimination signal to be emitted by the loudspeaker at a reference installation position of the loudspeaker under any stable working condition according to the noise elimination signal to be emitted by the loudspeaker under any stable working condition and a loudspeaker error function corresponding to the any stable working condition; wherein, the reference installation position S of the loudspeaker under any stable working condition n 0, The noise elimination signal to be emitted by the loudspeaker at the position is marked as
Step 11, according to the feedback transfer function corresponding to any user, feedback adjustment is made on the noise elimination signal to be emitted by the loudspeaker at the reference installation position of the loudspeaker under any stable working condition, the adjusted noise elimination signal to be emitted by the loudspeaker is obtained, and the adjusted noise elimination signal to be emitted by the loudspeaker is generated so as to perform active noise reduction; wherein the adjusted noise cancellation signal to be emitted by the loudspeaker is marked as
In the noise reduction method of the range hood, the optimal effect in the step 2 is a preset noise signal noise reduction amplitude value.
In a further development, in the noise reduction method of the range hood, in step 4, the feedback transfer function M (V 0 (t),V Ear The processing formula of (t)) is:
wherein V is Ear (t)＝A Ear sin(ω Ear t+β Ear )，V 0 (t)＝A 0 sin(ω 0 t+β 0 )。
Further, in the noise reduction method of the range hood, in step 6, the noise transfer function H (n, S) is expressed as follows:
wherein, noise signals are generated at the best installation position of the microphone under the stable working condition n in the debugging stateNoise signal +.>
Still further, in the noise reduction method of the range hood, in step 7, a speaker error function Δa of each stable working condition n of the range hood in the debug state n The processing formula of (2) is as follows:
wherein A is n The best installation position S of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state n, Noise cancellation signal emitted by loudspeakerAmplitude value of>The best installation position S of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state n, Noise cancellation signal emitted by the loudspeaker>R is equal to the initial phase of n R is the distance value between the loudspeaker and the target sound source at the optimal installation position of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state 0 The distance value of the loudspeaker at the reference installation position of the loudspeaker from the target sound source is the distance value of the loudspeaker from the target sound source, and the target sound source is the range hoodNoise signals generated at the position between the fan system and the air inlet.
Compared with the prior art, the invention has the advantages that: according to the invention, the reference noise signal of the range hood in the reference stable working condition under the actual installation environment and the reference installation position of the microphone and the reference installation position of the loudspeaker when the reference noise signal reaches the optimal noise reduction effect are obtained, the feedback transfer function for any user is obtained, the noise transfer function and the loudspeaker error function of the range hood in each stable working condition under the debugging state are respectively obtained, the noise signal to be emitted by the loudspeaker aiming at the noise signal at the optimal installation position of the microphone under the stable working condition is obtained, the noise signal to be emitted by the loudspeaker is adjusted according to the loudspeaker error function, the adjusted noise signal to be emitted by the loudspeaker is obtained, and finally the adjusted noise signal to be emitted by the loudspeaker is released, so that the active noise reduction effect on the noise signal generated by the range hood under the current stable working condition is realized.
Of course, the feedback transfer function obtained in the invention is related to different users, namely, different feedback transfer functions are corresponding to different users, so that the personalized noise reduction of the range hood for different users can be realized based on different feedback transfer functions, and the personalized noise reduction effect achieved in this way is more in line with the hearing effect of different users.
Drawings
Fig. 1 is a schematic flow chart of a noise reduction method of a range hood in the present embodiment.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
The embodiment provides a noise reduction method of a range hood. Specifically, as shown in fig. 1, the noise reduction method of the range hood comprises the following steps 1 to 11:
step 1, selecting any stable working condition of the range hood in an actual installation environment as a reference stable working condition, acquiring a noise signal generated by the range hood corresponding to the reference stable working condition in advance, and determining that the noise signal is to be generatedThe noise signal is used as a reference noise signal; wherein, the reference noise signal of the range hood is marked as V 0 (t)，t>0; in this embodiment, it is assumed that the reference noise signal V 0 (t)＝A 0 sin(ω 0 t+β 0 )，A 0 For the reference noise signal V 0 Vibration amplitude value of (t), ω 0 For the reference noise signal V 0 Angular frequency, beta 0 For the reference noise signal V 0 An initial phase of (t); once any stable working condition in the actual installation environment is selected as a reference stable working condition, the follow-up treatment of the noise reduction method in the embodiment takes the any stable working condition as the reference stable working condition;
step 2, acquiring the reference noise signal V in advance 0 A microphone optimal mounting position and a speaker optimal mounting position corresponding to the case where the noise reduction effect of (t) reaches the optimal effect, and taking the microphone optimal mounting position as a microphone reference mounting position and the speaker optimal mounting position as a speaker reference mounting position; wherein the microphone reference mounting position is marked as S 0, wheat The reference mounting position of the loudspeaker is marked as S 0, The optimal effect is a preset noise signal noise reduction amplitude value;
step 3, pre-collecting noise signals of at least one user corresponding to the range hood in the reference stable working condition, and taking the noise signals of any user at the ear position as feedback signals; wherein, the noise signal of the ear position of any user corresponding to the range hood under the reference stable working condition is marked as V Ear (t); it is assumed that in this embodiment, the noise signal V at the ear position of any user here Ear (t)＝A Ear sin(ω Ear t+β Ear )，A Ear For the noise signal V at the ear position Ear Vibration amplitude value of (t), ω Ear For the noise signal V at the ear position Ear Angular frequency, beta Ear For the noise signal V at the ear position Ear An initial phase of (t);
step 4, according to the reference noise signal V 0 (t) and feedback messagesNumber V Ear (t) processing to obtain a feedback transfer function during transfer of noise signals generated by the range hood from the microphone optimal mounting location to the ear of the any user; wherein the feedback transfer function is denoted as M (V 0 (t),V Ear (t)); and, in this embodiment, the first and second contact surfaces,i.e. the feedback transfer function M (V 0 (t),V Ear (t)) itself is a specific number, expressed by the formula A Ear sin(ω Ear t+β Ear ) The obtained value and the utilization formula A 0 sin(ω 0 t+β 0 ) The ratio between the values obtained;
step 5, respectively obtaining a microphone optimal installation position, a loudspeaker optimal installation position, a noise signal at the microphone optimal installation position, a noise elimination signal emitted by a loudspeaker at the loudspeaker optimal installation position and a noise signal at the microphone reference installation position, which correspond to the noise reduction effect of the noise signal generated when the range hood is under each stable working condition in a debugging state and reach an optimal effect in advance;
wherein the stable working condition of the range hood in the actual installation environment is different from the stable working condition of the range hood in the debugging state, the range hood is marked to have N stable working conditions in the debugging state, and the optimal installation position of the microphone corresponding to the case that the noise reduction effect of the noise signal generated by the range hood in the nth stable working condition in the debugging state reaches the optimal effect is marked as S n, wheat The optimal installation position of the loudspeaker corresponding to the condition that the noise reduction effect of the noise signal generated by the range hood under the nth stable working condition under the debugging state reaches the optimal effect is marked as S n, Optimum mounting position S of speaker n, The noise elimination signal emitted by the loudspeaker is marked asNoise signals at the best mounting positions of the microphones corresponding to the noise reduction effect of noise signals generated by the range hood under the nth stable working condition in the debugging state reaching the optimal effect are marked as + ->Noise signal mark of microphone reference installation position of range hood in nth stable working condition under debugging state is +.>Assume that in this embodiment: For the vibration amplitude value of noise signal at the optimal installation position of the corresponding microphone under the nth stable working condition in the debugging state, +.>For the angular frequency of noise signal at the optimum mounting position of the corresponding microphone in the nth stable working condition under the debugging state, < >>The initial phase of the noise signal at the optimal installation position of the corresponding microphone under the nth stable working condition in the debugging state;For the vibration amplitude value of the noise signal at the reference installation position of the corresponding microphone in the nth stable working condition under the debugging state, < + >>For the angular frequency of the noise signal at the reference mounting position of the corresponding microphone in the nth stable working condition in the debugging state, +.>The initial phase of the noise signal at the reference installation position of the corresponding microphone in the nth stable working condition in the debugging state;
step 6, respectively obtaining a noise transfer function from the microphone optimal mounting position to the microphone reference mounting position of the corresponding noise signal under the stable working conditions in the debugging state according to the obtained noise signal at the microphone optimal mounting position of the range hood under the stable working conditions in the debugging state and the obtained noise signal at the microphone reference mounting position under the stable working conditions; wherein, in the nth stable working condition under the debugging state, the noise signal is transmitted from the optimal installation position S of the microphone n, wheat To microphone reference mounting position S 0, wheat The noise transfer function of (c) is denoted H (n, S):
step 7, respectively processing and obtaining a speaker error function of each stable working condition of the range hood in the debugging state according to the obtained speaker optimal mounting position of the range hood in the debugging state, a noise elimination signal emitted by a speaker at the speaker optimal mounting position and a noise elimination signal emitted by a speaker at the speaker reference mounting position; wherein, the error function of the loudspeaker under the nth stable working condition of the range hood in the debugging state is marked as delta A n ＝A(S n ) Specifically:
wherein A is n The best installation position S of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state n, Noise cancellation signal emitted by loudspeakerAmplitude value of>The best installation position S of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state n, Noise cancellation signal emitted by the loudspeaker>R is equal to the initial phase of n The best installation position S of the loudspeaker corresponding to the stable working condition n of the range hood in the debugging state n, Distance value of loudspeaker from target sound source, R 0 For loudspeaker reference mounting position S 0, The distance value of the loudspeaker from the target sound source is the noise signal generated between the fan system of the range hood and the air inlet;
step 8, obtaining a noise signal at a microphone reference installation position corresponding to the range hood in any stable working condition under an actual installation environment, and calculating to obtain a noise signal at an optimal microphone installation position corresponding to any stable working condition according to a microphone transfer function value and the obtained noise signal at the microphone reference installation position in the any stable working condition; wherein, the arbitrary stable working condition of the range hood in the actual installation environment is marked as n ', and the noise signal at the reference installation position of the corresponding microphone in the arbitrary stable working condition n' is marked asThe noise signal mark at the optimal installation position of the microphone corresponding to any stable working condition n' is +.>And (F)>
Step 9, according to the noise signal at the best installation position of the microphone corresponding to any stable working condition nTo get the microphoneNoise signals at the optimal wind installation position are used as noise reduction signals to be emitted by the loudspeaker for noise reduction; wherein the noise signal is +_ for the microphone at the optimum mounting position>A noise elimination signal to be emitted by the loudspeaker for noise reduction is marked as A n' (t) the noise cancellation signal A to be emitted by the loudspeaker n' (t) is the noise signal->Sound signals with equal amplitude and opposite phases;
step 10, according to the obtained noise elimination signal A to be emitted by the loudspeaker under any stable working condition n n' (t) and a loudspeaker error function DeltaA corresponding to the arbitrary stable condition n n' Obtaining the reference installation position S of the loudspeaker under any stable working condition n 0, The loudspeaker at the position is to emit a noise elimination signal; wherein, the reference installation position S of the loudspeaker under any stable working condition n 0, The noise elimination signal to be emitted by the loudspeaker at the position is marked asSpeaker error function ΔA n' ＝A(S n' )；
Step 11, according to the feedback transfer function M (V 0 (t),V Ear (t)) to the obtained speaker reference mounting position S for any one of the stable conditions n 0, The loudspeaker at the location is to emit a noise cancellation signalFeedback adjustment is carried out, a noise elimination signal to be transmitted by the adjusted loudspeaker is obtained, and the noise elimination signal to be transmitted by the adjusted loudspeaker is generated so as to realize active noise reduction; wherein the adjusted noise cancellation signal to be emitted by the loudspeaker is marked as +.>
According to the noise reduction method of the range hood, through obtaining a reference noise signal of the range hood in a stable working condition in an actual installation environment and a microphone reference installation position and a loudspeaker reference installation position when an optimal noise reduction effect is achieved for the reference noise signal, a feedback transfer function for a user is obtained, a noise transfer function and a loudspeaker error function of the range hood in each stable working condition in a debugging state are respectively obtained, a noise signal to be emitted for a loudspeaker of the noise signal at the optimal installation position of the microphone in the stable working condition is obtained, the noise signal to be emitted for the loudspeaker is adjusted according to the loudspeaker error function, an adjusted noise signal to be emitted for the loudspeaker is obtained, and finally the adjusted noise signal to be emitted for the loudspeaker is released, so that an active noise reduction effect on the noise signal generated by the range hood in the current stable working condition is achieved.

Claims (5)

1.吸油烟机的降噪方法，其特征在于，包括如下步骤：1. A noise reduction method for a range hood, characterized by comprising the following steps: 步骤1，选取吸油烟机在实际安装环境下的任一稳定工况作为基准稳定工况，且预先获取吸油烟机在该基准稳定工况时所对应产生的噪声信号，且将该噪声信号作为基准噪声信号；其中，吸油烟机的基准噪声信号标记为V0(t)，t>0；Step 1: Select any stable operating condition of the range hood in the actual installation environment as the benchmark stable operating condition, and obtain the noise signal generated by the range hood under the benchmark stable operating condition in advance, and use the noise signal as the benchmark noise signal; wherein, the benchmark noise signal of the range hood is marked as V0 (t), t>0; 步骤2，预先获取针对基准噪声信号的降噪效果达到最优效果时所对应的麦克风最佳安装位置和扬声器最佳安装位置，且将该麦克风最佳安装位置作为麦克风基准安装位置以及将该扬声器最佳安装位置作为扬声器基准安装位置；其中，麦克风基准安装位置标记为S0,麦，扬声器基准安装位置标记为S0,；Step 2: Pre-obtain the optimal microphone installation position and the optimal speaker installation position corresponding to the optimal noise reduction effect for the reference noise signal, and use the optimal microphone installation position as the microphone reference installation position and the optimal speaker installation position as the speaker reference installation position; wherein, the microphone reference installation position is marked as S0 , and the speaker reference installation position is marked as S0 ,. 步骤3，预先采集吸油烟机在基准稳定工况时所对应至少一个任一用户的耳朵位置处噪声信号，且将该任一用户的耳朵位置处噪声信号作为反馈信号；其中，吸油烟机在基准稳定工况时所对应该任一用户的耳朵位置处噪声信号标记为V耳(t)；Step 3: Pre-collect the noise signal at the ear position of at least one user corresponding to the range hood under the baseline stable operating condition, and use the noise signal at the ear position of the user as the feedback signal; wherein, the noise signal at the ear position of the user corresponding to the range hood under the baseline stable operating condition is denoted as V_ear (t). 步骤4，根据基准噪声信号和反馈信号，处理得到吸油烟机所产生噪声信号自麦克风最佳安装位置传递至该任一用户的耳朵处的过程中的反馈传递函数；其中，该反馈传递函数标记为M(V0(t),V耳(t))；Step 4: Based on the reference noise signal and the feedback signal, process to obtain the feedback transfer function in the process of the noise signal generated by the range hood being transmitted from the optimal installation position of the microphone to the ear of any user; wherein, the feedback transfer function is denoted as M( V0 (t), Vear (t)); 步骤5，预先分别获取吸油烟机在调试状态下处于各稳定工况时所产生噪声信号的降噪效果达到最优效果时所对应的麦克风最佳安装位置、扬声器最佳安装位置、麦克风最佳安装位置处噪声信号、扬声器最佳安装位置处扬声器发射的消噪信号以及麦克风基准安装位置处噪声信号；其中，标记吸油烟机在调试状态下具有N个稳定工况，吸油烟机在调试状态下的第n个稳定工况时所产生噪声信号的降噪效果达到最优效果时所对应的麦克风最佳安装位置标记为Sn,麦，吸油烟机在调试状态下的第n个稳定工况时所产生噪声信号的降噪效果达到最优效果时所对应的扬声器最佳安装位置标记为Sn,，扬声器最佳安装位置Sn,处扬声器发射的消噪信号标记为吸油烟机在调试状态下的第n个稳定工况时所产生噪声信号的降噪效果达到最优效果时所对应的麦克风最佳安装位置处噪声信号标记为吸油烟机在调试状态下的第n个稳定工况时的麦克风基准安装位置处噪声信号标记为吸油烟机在实际安装环境下的基准稳定工况与其在调试状态下的各稳定工况不同；Step 5: Pre-acquire the optimal microphone installation position, optimal speaker installation position, noise signal at the optimal microphone installation position, noise-cancelled signal emitted by the speaker at the optimal speaker installation position, and noise signal at the microphone reference installation position when the noise reduction effect of the range hood reaches its optimal effect under various stable operating conditions during the debugging state. Specifically, mark the range hood as having N stable operating conditions during the debugging state. The optimal microphone installation position corresponding to the optimal noise reduction effect of the range hood's noise signal under the nth stable operating condition during the debugging state is marked as Sn , the optimal speaker installation position corresponding to the optimal noise reduction effect of the range hood's noise signal under the nth stable operating condition during the debugging state is marked as Sn , and the noise-cancelled signal emitted by the speaker at the optimal speaker installation position Sn is marked as Sn. The noise signal at the optimal microphone installation position when the noise reduction effect of the range hood reaches its best performance during the nth stable operating condition in the debugging state is marked as follows: The noise signal at the microphone reference mounting position during the nth stable operating condition of the range hood in the debugging state is marked as follows: The baseline stable operating conditions of a range hood in its actual installation environment differ from its various stable operating conditions during commissioning. 步骤6，根据所获取吸油烟机在调试状态下处于各稳定工况时的麦克风最佳安装位置处噪声信号以及各稳定工况时的麦克风基准安装位置处噪声信号，分别得到在调试状态下处于各稳定工况时所对应噪声信号从麦克风最佳安装位置到麦克风基准安装位置的噪声传递函数；其中，在调试状态下的第n个稳定工况时，噪声信号从麦克风最佳安装位置Sn,麦到麦克风基准安装位置S0,麦的噪声传递函数标记为H(n,S)， Step 6: Based on the noise signals at the optimal microphone mounting position and the reference microphone mounting position under various stable operating conditions in the debugging state, obtain the noise transfer function of the corresponding noise signal from the optimal microphone mounting position to the reference microphone mounting position under each stable operating condition in the debugging state; wherein, in the nth stable operating condition in the debugging state, the noise transfer function of the noise signal from the optimal microphone mounting position Sn to the reference microphone mounting position S0 is denoted as H(n,S). 步骤7，根据所获取吸油烟机在调试状态下的每一个稳定工况时的扬声器最佳安装位置、扬声器最佳安装位置处扬声器发射的消噪信号以及扬声器基准安装位置处扬声器，分别处理得到吸油烟机在调试状态下的每一个稳定工况的扬声器误差函数；其中，吸油烟机在调试状态下的第n个稳定工况的扬声器误差函数标记为△An＝A(Sn)；Step 7: Based on the optimal speaker installation position, the noise cancellation signal emitted by the speaker at the optimal speaker installation position, and the speaker at the reference installation position of the range hood under each stable operating condition in the debugging state, process the data to obtain the speaker error function for each stable operating condition of the range hood under the debugging state; wherein, the speaker error function for the nth stable operating condition of the range hood under the debugging state is denoted as △A <sub>n</sub> ＝A(S<sub>n</sub> ). 步骤8，获取吸油烟机在实际安装环境下任一稳定工况时所对应麦克风基准安装位置处噪声信号，并且根据该任一稳定工况时噪声传递函数以及获取的该麦克风基准安装位置处噪声信号，计算得到该任一稳定工况时所对应的麦克风最佳安装位置处噪声信号；其中，吸油烟机在实际安装环境下的该任一稳定工况标记为n'，该任一稳定工况n'时所对应麦克风基准安装位置处噪声信号标记为该任一稳定工况n'时所对应的麦克风最佳安装位置处噪声信号标记为并且， Step 8: Obtain the noise signal at the microphone reference mounting position corresponding to any stable operating condition of the range hood under actual installation environment. Based on the noise transfer function under that stable operating condition and the obtained noise signal at the microphone reference mounting position, calculate the noise signal at the optimal microphone mounting position corresponding to that stable operating condition. Here, the stable operating condition of the range hood under actual installation environment is denoted as n', and the noise signal at the microphone reference mounting position corresponding to that stable operating condition n' is denoted as... The noise signal at the optimal microphone mounting position corresponding to any stable operating condition n' is marked as follows: and, 步骤9，根据所得该任一稳定工况时所对应的麦克风最佳安装位置处噪声信号，得到针对该麦克风最佳安装位置处噪声信号做降噪的扬声器待发射消噪信号；其中，针对该麦克风最佳安装位置处噪声信号做降噪的扬声器待发射消噪信号标记为An'(t)，扬声器待发射消噪信号An'(t)为与噪声信号幅值相等且相位相反的声音信号；Step 9: Based on the noise signal at the optimal microphone mounting position corresponding to any stable operating condition, obtain the noise reduction signal to be emitted by the speaker for noise reduction at the optimal microphone mounting position; wherein, for the noise signal at the optimal microphone mounting position... The noise cancellation signal to be emitted by the loudspeaker used for noise reduction is denoted as An' (t). The noise cancellation signal An' (t) to be emitted by the loudspeaker is the signal that is compared with the noise signal. Sound signals with equal amplitude and opposite phase; 步骤10，根据所得该任一稳定工况时的扬声器待发射消噪信号和对应该任一稳定工况的扬声器误差函数，得到该任一稳定工况时的扬声器基准安装位置处的扬声器待发射消噪信号；其中，该任一稳定工况n'时的扬声器基准安装位置S0,处的扬声器待发射消噪信号标记为 Step 10: Based on the loudspeaker noise cancellation signal to be emitted under any stable operating condition and the loudspeaker error function corresponding to that stable operating condition, obtain the loudspeaker noise cancellation signal to be emitted at the loudspeaker reference mounting position under any stable operating condition; wherein, the loudspeaker noise cancellation signal to be emitted at the loudspeaker reference mounting position S0 under any stable operating condition n' is marked as... 步骤11，根据所得该任一用户对应的反馈传递函数对所得该任一稳定工况时的扬声器基准安装位置处的扬声器待发射消噪信号做出反馈调节，得到调节后的扬声器待发射消噪信号，并且生成调节后的该扬声器待发射消噪信号，以做主动降噪；其中，调节后的扬声器待发射消噪信号标记为 Step 11: Based on the feedback transfer function corresponding to any user, adjust the speaker noise cancellation signal at the speaker reference installation position under any stable operating condition to obtain the adjusted speaker noise cancellation signal, and generate the adjusted speaker noise cancellation signal for active noise reduction; wherein, the adjusted speaker noise cancellation signal is marked as... 2.根据权利要求1所述的吸油烟机的降噪方法，其特征在于，步骤2中的所述最优效果为预设的噪声信号降噪幅度值。2. The noise reduction method for a range hood according to claim 1, wherein the optimal effect in step 2 is a preset noise signal noise reduction amplitude value. 3.根据权利要求1所述的吸油烟机的降噪方法，其特征在于，在步骤4中，反馈传递函数M(V0(t),V耳(t))的处理公式为：3. The noise reduction method for a range hood according to claim 1, characterized in that, in step 4, the processing formula for the feedback transfer function M(V <sub>0</sub> (t), V <sub>ear</sub> (t)) is: 其中，V耳(t)＝A耳sin(ω耳t+β耳)，V0(t)＝A0sin(ω0t+β0)，A耳为该耳朵位置处噪声信号V耳(t)的振动幅度值，ω耳为该耳朵位置处噪声信号V耳(t)的角频率，β耳为该耳朵位置处噪声信号V耳(t)的初始相位；A0为该基准噪声信号V0(t)的振动幅度值，ω0为该基准噪声信号V0(t)的角频率，β0为该基准噪声信号V0(t)的初始相位。Where, V_ear (t) = A_ear sin( ω_ear t + β_ear ), V_0 (t) = A_0 sin( ω_0 t + β_0 ), A_ear is the vibration amplitude of the noise signal V_ear (t) at the ear position, ω_ear is the angular frequency of the noise signal V_ear (t) at the ear position, and β_ear is the initial phase of the noise signal V_ear (t) at the ear position; A_0 is the vibration amplitude of the reference noise signal V_0 (t), ω_0 is the angular frequency of the reference noise signal V_0 (t), and β_0 is the initial phase of the reference noise signal V_0 (t). 4.根据权利要求1所述的吸油烟机的降噪方法，其特征在于，在步骤6中，所述噪声传递函数H(n,S)表达如下：4. The noise reduction method for a range hood according to claim 1, characterized in that, in step 6, the noise transfer function H(n,S) is expressed as follows: 其中，在调试状态下处于稳定工况n时的麦克风最佳安装位置处噪声信号在调试状态下处于稳定工况n时的麦克风基准安装位置处噪声信号 Among them, the noise signal at the optimal installation position of the microphone when it is in stable operating condition n under debugging state. Noise signal at the microphone reference mounting position when the microphone is in stable operating condition n during debugging. 5.根据权利要求1所述的吸油烟机的降噪方法，其特征在于，在步骤7中，吸油烟机在调试状态下的每一个稳定工况n的扬声器误差函数△An的处理公式为：5. The noise reduction method for a range hood according to claim 1, characterized in that, in step 7, the processing formula for the speaker error function ΔA<sub>n</sub> for each stable operating condition n of the range hood in the debugging state is: 其中，An为吸油烟机在调试状态下的稳定工况n时所对应扬声器最佳安装位置Sn,处扬声器发射的消噪信号的振幅值，为吸油烟机在调试状态下的稳定工况n时所对应扬声器最佳安装位置Sn,处扬声器发射的消噪信号的初始相位，Rn为吸油烟机在调试状态下的稳定工况n时所对应扬声器最佳安装位置处扬声器距离目标声源的距离值，R0为扬声器基准安装位置处的扬声器距离目标声源的距离值，目标声源为吸油烟机的风机系统与进风口之间位置所产生的噪声信号。Where, An represents the optimal speaker installation position Sn corresponding to the stable operating condition n of the range hood under debugging state, and the noise reduction signal emitted by the speaker at that position. The amplitude value, The optimal speaker installation position Sn corresponds to the noise reduction signal emitted by the speaker when the range hood is in stable operating condition n during the debugging phase. The initial phase, R <sub>n </sub> is the distance between the speaker and the target sound source at the optimal installation position of the speaker when the range hood is in stable working condition n under the debugging state, and R <sub>0 </sub> is the distance between the speaker and the target sound source at the reference installation position of the speaker. The target sound source is the noise signal generated between the fan system and the air inlet of the range hood.
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