CN113689841A - Noise reduction method of range hood - Google Patents

Noise reduction method of range hood Download PDF

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CN113689841A
CN113689841A CN202110770730.XA CN202110770730A CN113689841A CN 113689841 A CN113689841 A CN 113689841A CN 202110770730 A CN202110770730 A CN 202110770730A CN 113689841 A CN113689841 A CN 113689841A
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noise
working condition
stable working
loudspeaker
range hood
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CN113689841B (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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Abstract

The invention relates to a noise reduction method of a range hood, which comprises the steps of obtaining a reference noise signal when the range hood is in a reference stable working condition under an actual installation environment, and obtaining a microphone reference installation position and a loudspeaker reference installation position when the reference noise signal achieves an optimal noise reduction effect, and obtaining feedback transfer function for users, and then respectively obtaining noise transfer function and speaker error function of the extractor hood under each stable working condition in debugging state, and then obtaining the noise-canceling signal to be emitted by the loudspeaker aiming at the noise signal at the optimal mounting position of the microphone under the stable working condition, and adjusting the noise-canceling signal to be emitted by the loudspeaker according to the loudspeaker error function to obtain an adjusted noise-canceling signal to be emitted by the loudspeaker, and finally, the adjusted to-be-emitted noise-canceling signal of the loudspeaker is released by the loudspeaker, so that the active noise reduction effect of the noise signal generated by the range hood under the current stable working condition is realized.

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 has become the essential equipment in most family kitchens, and the range hood can produce noise usually at work, and influences the use experience effect of users. In order to reduce the adverse effect of noise generated during the operation of the range hood on users, an active noise reduction method (or called an active noise reduction method) is mainly adopted for noise reduction treatment at present.
The existing active noise reduction method is mainly characterized in that a noise collector for collecting the whole noise of the range hood, a sound signal generator and a loudspeaker device are additionally arranged on the basis of the structure of the existing range hood, the noise collector collects the whole noise of the range hood as a reference noise source and sends the collected whole noise to the sound signal generator, then the sound signal generator generates sound wave signals with the same amplitude and opposite phases as the whole noise of the range hood according to the whole noise of the range hood collected by the noise collector, and the sound wave signals are broadcasted by the loudspeaker device, so that the sound wave signals offset the whole noise of the range hood, and the noise reduction effect is achieved.
The Chinese patent application CN107289482A discloses a range hood self-learning automatic noise reduction system and a method, wherein the range hood self-learning automatic noise reduction system comprises a range hood, a microphone and a loudspeaker are arranged on the range hood, and a CPU of the range hood is electrically connected with a signal processing module, a self-learning noise reduction algorithm module and a pre-calibration module respectively. The self-learning automatic noise reduction method of the range hood mainly comprises the following steps of: (1) after the range hood is installed in a user home, the range hood is enabled to operate at different rotating speed sections; (2) collecting the noise of the cigarette machine and the environmental noise of different rotating speed sections through a microphone, and feeding back the collected actual measurement data to a signal processing module on the cigarette machine; (3) the self-learning noise reduction algorithm module generates a corresponding sound waveform according to reference data preset in the pre-calibration module and by combining measured data of smoke machine noise and environmental noise; (4) and outputting the sound waveform through a loudspeaker to counteract most of the noise.
However, the self-learning automatic noise reduction method of the range hood disclosed in the patent application CN107289482A of the invention has the following defects: the installation positions of the microphone and the loudspeaker in the range hood are fixed, because the range hood has different working conditions when in work, the rotating speed ranges of the fan of the range hood are different under different working conditions, and the optimal installation positions of the microphone and the loudspeaker, which are required to be matched with each other to perform noise reduction, of the fan under different rotating speed ranges are different, so that the self-learning automatic noise reduction scheme can only perform noise reduction treatment on noise generated by the range hood under individual working conditions, and cannot perform noise reduction treatment on noise generated by the range hood under all working conditions, namely cannot perform targeted noise reduction treatment on noise signals generated by the oil suction machine under different working conditions.
Disclosure of Invention
The technical problem to be solved by the invention is 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 signal to be generated according to different working conditions of the range hood during operation, thereby realizing the active noise reduction effect of the noise signal generated by the range hood under different stable working conditions.
The technical scheme adopted by the invention 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 stable working condition of the range hood in an actual installation environment as a reference stable working condition, acquiring a noise signal correspondingly generated by the range hood under the reference stable working condition in advance, and using the noise signal as a reference noise signal; wherein, the reference noise signal of the range hood is marked as V0(t)，t>0；
Step 2, acquiring in advance an optimal microphone mounting position and an optimal speaker mounting position corresponding to the optimal noise reduction effect for the reference noise signal, and taking the optimal microphone mounting position as a microphone reference mounting position and the optimal speaker mounting position as a speaker reference mounting position; wherein the reference installation position mark of the microphone is S0, wheatThe reference mounting position of the speaker is marked as S0,；
Step 3, collecting noise signals at the ear position of at least one user corresponding to the range hood under the reference stable working condition in advance, and taking the noise signals at the ear position of the user as feedback signals; wherein, the noise signal mark of the extractor hood at the ear position corresponding to any user is V when the extractor hood is in the standard stable working conditionEar piece(t)；
Step 4, processing the reference noise signal and the feedback signal to obtain the product of the range hoodA feedback transfer function in the process of transferring the noise-generated signal from the optimal mounting position of the microphone to the ear of any user; wherein the feedback transfer function is labeled as M (V)0(t),VEar piece(t))；
Step 5, respectively acquiring a microphone optimal installation position, a speaker optimal installation position, a noise signal at the microphone optimal installation position, a noise elimination signal emitted by a speaker at the speaker optimal installation position and a noise signal at a microphone reference installation position corresponding to the optimal noise reduction effect of the noise signal generated when the range hood is in each stable working condition in the debugging state;
wherein, the mark range hood has N stable working conditions under the debugging state, the mark S is the best installation position of the corresponding microphone when 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 effectn, wheatAnd when the noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state reaches the optimal effect, the corresponding optimal installation position mark of the loudspeaker is Sn,Optimum mounting position S of speakern,Marking of noise-canceling signals emitted by loudspeakers
Figure BDA0003153202830000021
Marking the noise signal at the optimal microphone mounting position corresponding to the optimal noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state
Figure BDA0003153202830000031
Marking noise signals at the reference mounting position of the microphone when the range hood is in the nth stable working condition in the debugging state
Figure BDA0003153202830000032
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 of the range hood in the debugging state;
step 6, according to the obtained range hood in each stable state in the debugging stateNoise signals at the optimal microphone mounting position under the fixed working condition and noise signals at the reference microphone mounting position under each stable working condition respectively obtain noise transfer functions of the corresponding noise signals from the optimal microphone mounting position to the reference microphone mounting position under each stable working condition in a debugging state; wherein, in the nth stable working condition in the debugging state, the noise signal is arranged at the optimal mounting position S of the microphonen, wheatTo microphone reference mounting position S0, wheatIs labeled H (n, S),
Figure BDA0003153202830000033
step 7, respectively processing the acquired optimal installation position of the loudspeaker when the range hood is in each stable working condition in the debugging state, the noise elimination signal emitted by the loudspeaker at the optimal installation position of the loudspeaker and the loudspeaker at the reference installation position of the loudspeaker to obtain a loudspeaker error function of each stable working condition of the range hood in the debugging state; wherein, the error function of the n-th stable working condition loudspeaker of the range hood in the debugging state is marked as delta An＝A(Sn)；
Step 8, acquiring a noise signal at a reference mounting position of a microphone corresponding to the range hood under any stable working condition in an actual mounting environment, and calculating to obtain a noise signal at an optimal mounting position of the microphone corresponding to any stable working condition according to a noise transfer function under any stable working condition and the acquired noise signal at the reference mounting position of the microphone; wherein, the stable working condition of the range hood under the actual installation environment is marked as n ', and the noise signal at the reference installation position of the corresponding microphone is marked as n' under the stable working condition
Figure BDA0003153202830000034
Marking the noise signal at the optimal installation position of the corresponding microphone under any stable working condition n
Figure BDA0003153202830000035
And the number of the first and second electrodes,
Figure BDA0003153202830000036
step 9, obtaining a speaker to-be-emitted noise-canceling signal for noise reduction aiming at the noise signal at the optimal mounting position of the microphone according to the obtained noise signal at the optimal mounting position of the microphone corresponding to any stable working condition; wherein a noise signal is generated at an optimum mounting position for the microphone
Figure BDA0003153202830000037
The to-be-transmitted noise-canceling signal of the noise-reducing loudspeaker is marked as An'(t) the speaker is to emit a noise canceling signal An'(t) is a noise signal
Figure BDA0003153202830000038
Sound signals with equal amplitude and opposite phase;
step 10, obtaining a speaker to-be-emitted noise-canceling signal at a speaker reference installation position under any stable working condition according to the obtained speaker to-be-emitted noise-canceling signal under any stable working condition and a speaker error function corresponding to any stable working condition; wherein, the reference mounting position S of the loudspeaker under any stable working condition n0,Marking the to-be-transmitted noise-canceling signal of the loudspeaker at
Figure BDA0003153202830000041
Step 11, making feedback adjustment on the speaker to-be-transmitted noise-canceling signal at the speaker reference installation position under any stable working condition according to the obtained feedback transfer function corresponding to any user to obtain an adjusted speaker to-be-transmitted noise-canceling signal, and generating the adjusted speaker to-be-transmitted noise-canceling signal to make active noise reduction; wherein the adjusted noise-canceling signal mark to be emitted by the loudspeaker is
Figure BDA0003153202830000042
In an improved manner, in the noise reduction method for the range hood, the optimal effect in the step 2 is a preset noise signal noise reduction amplitude value.
In a further improvement, in the noise reduction method for a range hood, in step 4, the transfer function M (V) is fed back0(t),VEar piece(t)) the processing formula is:
Figure BDA0003153202830000043
wherein, VEar piece(t)＝AEar piecesin(ωEar piecet+βEar piece)，V0(t)＝A0sin(ω0t+β0)。
Further, in the noise reduction method of the range hood, in step 6, the noise transfer function H (n, S) is expressed as follows:
Figure BDA0003153202830000044
wherein, the noise signal at the optimal installation position of the microphone under the stable working condition n in the debugging state
Figure BDA0003153202830000045
Noise signal at reference microphone mounting location when in steady state n in debug state
Figure BDA0003153202830000046
Still further, in the noise reduction method of the range hood, in step 7, the speaker error function Δ a of each stable working condition n of the range hood in the debugging statenThe processing formula of (1) is as follows:
Figure BDA0003153202830000047
wherein A isnThe optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging staten,To noise-canceling signals emitted by loudspeakers
Figure BDA0003153202830000048
The amplitude value of the frequency band,
Figure BDA0003153202830000049
the optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging staten,To noise-canceling signals emitted by loudspeakers
Figure BDA0003153202830000051
Initial phase of (1), RnThe distance value R of the loudspeaker at the optimal installation position of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging state from the target sound source0The target sound source is a distance value between a loudspeaker at the loudspeaker reference installation position and the target sound source, and the target sound source is a noise signal generated at a position between a fan system and an air inlet of the range hood.
Compared with the prior art, the invention has the advantages that: the invention obtains the reference noise signal when the range hood is in the reference stable working condition under the actual installation environment, and the microphone reference installation position and the loudspeaker reference installation position when the optimal noise reduction effect is achieved aiming at the reference noise signal, and obtaining a feedback transfer function aiming at any user, and respectively obtaining a noise transfer function and a loudspeaker error function of the range hood under each stable working condition in a debugging state, and then obtaining the noise-canceling signal to be emitted by the loudspeaker aiming at the noise signal at the optimal mounting position of the microphone under the stable working condition, and adjusting the noise-canceling signal to be emitted by the loudspeaker according to the loudspeaker error function to obtain an adjusted noise-canceling signal to be emitted by the loudspeaker, and finally, the adjusted to-be-emitted noise-canceling signal of the loudspeaker is released by the loudspeaker, so that the active noise reduction effect of the noise signal generated by the range hood under the current stable working condition is realized.
Certainly, the feedback transfer functions obtained in the invention are related to different users, that is, different feedback transfer functions are provided correspondingly for different users, so that the range hood can realize personalized noise reduction for different users based on different feedback transfer functions, and the personalized noise reduction effect achieved in this way is more in line with the auditory effects of different users.
Drawings
Fig. 1 is a schematic flow chart of a noise reduction method of a range hood in this embodiment.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
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 of 1-11:
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 correspondingly generated by the range hood under the reference stable working condition in advance, and using the noise signal as a reference noise signal; wherein, the reference noise signal of the range hood is marked as V0(t)，t>0; in this embodiment, it is assumed that the reference noise signal V0(t)＝A0sin(ω0t+β0)，A0For the reference noise signal V0Magnitude of vibration, ω, of (t)0For the reference noise signal V0Angular frequency of (t), beta0For the reference noise signal V0(t) an initial phase; once any stable working condition under the actual installation environment is selected as a reference stable working condition, the subsequent processing of the noise reduction method in the embodiment takes the stable working condition as the reference stable working condition;
step 2, acquiring a reference noise signal V in advance0(t) the optimal mounting position of the microphone and the optimal mounting position of the speaker corresponding to the optimal noise reduction effect, and taking the optimal mounting position of the microphone as a reference mounting position of the microphone and the optimal mounting position of the speaker as a reference mounting position of the speaker; wherein the reference installation position mark of the microphone is S0, wheatThe reference mounting position of the speaker is marked as S0,The optimal effect is a preset noise signal noise reduction amplitude value;
step 3, preFirstly, collecting a noise signal at the ear position of at least one user corresponding to the range hood under a reference stable working condition, and taking the noise signal at the ear position of the user as a feedback signal; wherein, the noise signal mark of the extractor hood at the ear position corresponding to any user is V when the extractor hood is in the standard stable working conditionEar piece(t); it is assumed that, in this embodiment, the noise signal V is present at the ear position of the arbitrary user hereEar piece(t)＝AEar piecesin(ωEar piecet+βEar piece)，AEar pieceFor the noise signal V at the ear positionEar pieceMagnitude of vibration, ω, of (t)Ear pieceFor the noise signal V at the ear positionEar pieceAngular frequency of (t), betaEar pieceFor the noise signal V at the ear positionEar piece(t) an initial phase;
step 4, according to the reference noise signal V0(t) and a feedback signal VEar piece(t), 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 labeled as M (V)0(t),VEar piece(t)); and, in this embodiment,
Figure BDA0003153202830000061
i.e. the feedback transfer function M (V)0(t),VEar piece(t)) itself is a specific value for utilizing formula AEar piecesin(ωEar piecet+βEar piece) The obtained value and the utilization formula A0sin(ω0t+β0) The ratio between the values obtained;
step 5, respectively acquiring a microphone optimal installation position, a speaker optimal installation position, a noise signal at the microphone optimal installation position, a noise elimination signal emitted by a speaker at the speaker optimal installation position and a noise signal at a microphone reference installation position corresponding to the optimal noise reduction effect of the noise signal generated when the range hood is in each stable working condition in the debugging state;
wherein, the range hood is in stable working condition under the actual installation environment and not in stable working condition under the debugging stateAnd simultaneously, marking the range hood to have N stable working conditions in the debugging state, and marking the optimal installation position of the microphone corresponding to the noise reduction effect of the noise signal generated when the range hood reaches the optimal effect in the nth stable working condition in the debugging state as Sn, wheatAnd when the noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state reaches the optimal effect, the corresponding optimal installation position mark of the loudspeaker is Sn,Optimum mounting position S of speakern,Marking of noise-canceling signals emitted by loudspeakers
Figure BDA0003153202830000062
Marking the noise signal at the optimal microphone mounting position corresponding to the optimal noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state
Figure BDA0003153202830000071
Marking noise signals at the reference mounting position of the microphone when the range hood is in the nth stable working condition in the debugging state
Figure BDA0003153202830000072
Assume in this embodiment:
Figure BDA0003153202830000073
Figure BDA0003153202830000074
Figure BDA0003153202830000075
the vibration amplitude value of the noise signal at the optimal installation position of the corresponding microphone under the nth stable working condition in the debugging state,
Figure BDA0003153202830000076
the angular frequency of the noise signal at the optimal installation position of the corresponding microphone under the nth stable working condition in the debugging state,
Figure BDA0003153202830000077
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;
Figure BDA0003153202830000078
the vibration amplitude value of the noise signal at the reference installation position of the corresponding microphone under the nth stable working condition in the debugging state,
Figure BDA0003153202830000079
the angular frequency of the noise signal at the reference mounting position of the corresponding microphone under the nth stable working condition in the debugging state,
Figure BDA00031532028300000710
the initial phase of the noise signal at the reference installation position of the corresponding microphone under the nth stable working condition in the debugging state;
step 6, respectively obtaining noise transfer functions of the noise signals corresponding to the range hood in each stable working condition from the optimal microphone mounting position to the reference microphone mounting position according to the obtained noise signals at the optimal microphone mounting position and the noise signals at the reference microphone mounting position in each stable working condition in the debugging state; wherein, in the nth stable working condition in the debugging state, the noise signal is arranged at the optimal mounting position S of the microphonen, wheatTo microphone reference mounting position S0, wheatIs labeled H (n, S):
Figure BDA00031532028300000711
and 7, respectively processing the noise-eliminating signals according to the acquired optimal installation position of the loudspeaker, the noise-eliminating signal emitted by the loudspeaker at the optimal installation position of the loudspeaker and the noise-eliminating signal emitted by the loudspeaker at the reference installation position of the loudspeaker when the range hood is in each stable working condition in the debugging state to obtain the loudspeaker of each stable working condition of the range hood in the debugging stateAn error function; wherein, the error function of the n-th stable working condition loudspeaker of the range hood in the debugging state is marked as delta An＝A(Sn) Specifically:
Figure BDA00031532028300000712
wherein A isnThe optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging staten,To noise-canceling signals emitted by loudspeakers
Figure BDA00031532028300000713
The amplitude value of the frequency band,
Figure BDA00031532028300000714
the optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging staten,To noise-canceling signals emitted by loudspeakers
Figure BDA0003153202830000081
Initial phase of (1), RnThe optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging staten,Distance value of loudspeaker from target sound source, R0Referencing mounting location S for a loudspeaker0,The distance value between the loudspeaker and a target sound source is the noise signal generated between a fan system of the range hood and an air inlet;
step 8, acquiring a noise signal at a reference mounting position of a microphone corresponding to the range hood under any stable working condition in an actual mounting environment, and calculating to obtain a noise signal at an optimal mounting position of the microphone corresponding to the range hood under any stable working condition according to a transfer function value of the microphone under any stable working condition and the acquired noise signal at the reference mounting position of the microphone; wherein, the stable working condition of the range hood under the actual installation environment is marked as n ', and the noise signal at the reference installation position of the corresponding microphone is marked as n' under the stable working condition
Figure BDA0003153202830000082
Marking the noise signal at the optimal installation position of the corresponding microphone under any stable working condition n
Figure BDA0003153202830000083
And the number of the first and second electrodes,
Figure BDA0003153202830000084
step 9, according to the noise signal at the optimal installation position of the microphone corresponding to any stable working condition n
Figure BDA0003153202830000085
Obtaining a noise-canceling signal to be emitted by the loudspeaker for noise reduction aiming at the noise signal at the optimal mounting position of the microphone; wherein a noise signal is generated at an optimum mounting position for the microphone
Figure BDA0003153202830000086
The to-be-transmitted noise-canceling signal of the noise-reducing loudspeaker is marked as An'(t) the speaker is to emit a noise canceling signal An'(t) is a noise signal
Figure BDA0003153202830000087
Sound signals with equal amplitude and opposite phase;
step 10, according to the noise-canceling signal A to be emitted by the loudspeaker under any stable working condition nn'(t) and a loudspeaker error function Δ A corresponding to any of the stable conditions nn'Obtaining the reference installation position S of the loudspeaker under any stable working condition n0,A speaker at the position is to transmit a noise elimination signal; wherein, the reference mounting position S of the loudspeaker under any stable working condition n0,Marking the to-be-transmitted noise-canceling signal of the loudspeaker at
Figure BDA0003153202830000088
Loudspeaker error function Delta An'＝A(Sn')；
Step 11, according to the obtained taskFeedback transfer function M (V) corresponding to a user0(t),VEar piece(t)) the reference mounting position S of the loudspeaker in any stable condition n' obtained0,To-be-transmitted noise-canceling signal of loudspeaker
Figure BDA0003153202830000089
Making feedback adjustment to obtain an adjusted noise elimination signal to be emitted by the loudspeaker, and generating the adjusted noise elimination signal to be emitted by the loudspeaker to make active noise reduction; wherein the adjusted noise-canceling signal mark to be emitted by the loudspeaker is
Figure BDA00031532028300000810
The noise reduction method of the range hood in the embodiment obtains the reference noise signal of the range hood under the stable working condition in the actual installation environment and the microphone reference installation position and the loudspeaker reference installation position when the optimal noise reduction effect is achieved aiming at the reference noise signal, and obtaining feedback transfer function for users, and then respectively obtaining noise transfer function and speaker error function of the extractor hood under each stable working condition in debugging state, and then obtaining the noise-canceling signal to be emitted by the loudspeaker aiming at the noise signal at the optimal mounting position of the microphone under the stable working condition, and adjusting the noise-canceling signal to be emitted by the loudspeaker according to the loudspeaker error function to obtain an adjusted noise-canceling signal to be emitted by the loudspeaker, and finally, the adjusted to-be-emitted noise-canceling signal of the loudspeaker is released by the loudspeaker, so that the active noise reduction effect of the noise signal generated by the range hood under the current stable working condition is realized.

Claims (5)

1. The noise reduction method of the range hood is characterized by comprising the following steps of:
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 correspondingly generated by the range hood under the reference stable working condition in advance, and using the noise signal as a reference noise signal; wherein, the reference noise signal of the range hood is marked as V0(t)，t>0；
Step 2, acquiring in advance an optimal microphone mounting position and an optimal speaker mounting position corresponding to the optimal noise reduction effect for the reference noise signal, and taking the optimal microphone mounting position as a microphone reference mounting position and the optimal speaker mounting position as a speaker reference mounting position; wherein the reference installation position mark of the microphone is S0, wheatThe reference mounting position of the speaker is marked as S0,；
Step 3, collecting noise signals at the ear position of at least one user corresponding to the range hood under the reference stable working condition in advance, and taking the noise signals at the ear position of the user as feedback signals; wherein, the noise signal mark of the extractor hood at the ear position corresponding to any user is V when the extractor hood is in the standard stable working conditionEar piece(t)；
Step 4, processing the reference noise signal and the feedback signal to obtain a feedback transfer function of the noise signal generated by the range hood in the process of transferring the noise signal from the optimal mounting position of the microphone to the ear of any user; wherein the feedback transfer function is labeled as M (V)0(t),VEar piece(t))；
Step 5, respectively acquiring a microphone optimal installation position, a speaker optimal installation position, a noise signal at the microphone optimal installation position, a noise elimination signal emitted by a speaker at the speaker optimal installation position and a noise signal at a microphone reference installation position corresponding to the optimal noise reduction effect of the noise signal generated when the range hood is in each stable working condition in the debugging state; wherein, the mark range hood has N stable working conditions under the debugging state, the mark S is the best installation position of the corresponding microphone when 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 effectn, wheatAnd when the noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state reaches the optimal effect, the corresponding optimal installation position mark of the loudspeaker is SnOptimum speaker mounting position SnMarking the noise-canceling signal emitted by the loudspeaker
Figure FDA0003153202820000011
Marking the noise signal at the optimal microphone mounting position corresponding to the optimal noise reduction effect of the noise signal generated by the range hood under the nth stable working condition in the debugging state
Figure FDA0003153202820000012
Marking noise signals at the reference mounting position of the microphone when the range hood is in the nth stable working condition in the debugging state
Figure FDA0003153202820000013
The reference stable working condition of the range hood in the actual installation environment is different from each stable working condition of the range hood in the debugging state;
step 6, respectively obtaining noise transfer functions of the noise signals corresponding to the range hood in each stable working condition from the optimal microphone mounting position to the reference microphone mounting position according to the obtained noise signals at the optimal microphone mounting position and the noise signals at the reference microphone mounting position in each stable working condition in the debugging state; wherein, in the nth stable working condition in the debugging state, the noise signal is arranged at the optimal mounting position S of the microphonen, wheatTo microphone reference mounting position S0, wheatIs labeled H (n, S),
Figure FDA0003153202820000021
step 7, respectively processing the acquired optimal installation position of the loudspeaker when the range hood is in each stable working condition in the debugging state, the noise elimination signal emitted by the loudspeaker at the optimal installation position of the loudspeaker and the loudspeaker at the reference installation position of the loudspeaker to obtain a loudspeaker error function of each stable working condition of the range hood in the debugging state; wherein, the error function of the n-th stable working condition loudspeaker of the range hood in the debugging state is marked as delta An＝A(Sn)；
Step 8, acquiring a noise signal at a reference mounting position of a microphone corresponding to the range hood under any stable working condition in an actual mounting environment, and calculating to obtain a noise signal at an optimal mounting position of the microphone corresponding to any stable working condition according to a noise transfer function under any stable working condition and the acquired noise signal at the reference mounting position of the microphone; wherein, the stable working condition of the range hood under the actual installation environment is marked as n ', and the noise signal at the reference installation position of the corresponding microphone is marked as n' under the stable working condition
Figure FDA0003153202820000022
Marking the noise signal at the optimal installation position of the corresponding microphone under any stable working condition n
Figure FDA0003153202820000023
And the number of the first and second electrodes,
Figure FDA0003153202820000024
step 9, obtaining a speaker to-be-emitted noise-canceling signal for noise reduction aiming at the noise signal at the optimal mounting position of the microphone according to the obtained noise signal at the optimal mounting position of the microphone corresponding to any stable working condition; wherein a noise signal is generated at an optimum mounting position for the microphone
Figure FDA0003153202820000025
The to-be-transmitted noise-canceling signal of the noise-reducing loudspeaker is marked as An'(t) the speaker is to emit a noise canceling signal An'(t) is a noise signal
Figure FDA0003153202820000026
Sound signals with equal amplitude and opposite phase;
step 10, obtaining the noise-canceling signal to be emitted by the loudspeaker under any stable working condition and the loudspeaker error function corresponding to any stable working condition according to the obtained noise-canceling signal to be emitted by the loudspeaker under any stable working conditionA speaker to be transmitted noise-canceling signal at the speaker reference mounting position; wherein, the reference mounting position S of the loudspeaker under any stable working condition n0,Marking the to-be-transmitted noise-canceling signal of the loudspeaker at
Figure FDA0003153202820000027
Step 11, making feedback adjustment on the speaker to-be-transmitted noise-canceling signal at the speaker reference installation position under any stable working condition according to the obtained feedback transfer function corresponding to any user to obtain an adjusted speaker to-be-transmitted noise-canceling signal, and generating the adjusted speaker to-be-transmitted noise-canceling signal to make active noise reduction; wherein the adjusted noise-canceling signal mark to be emitted by the loudspeaker is
Figure FDA0003153202820000031
2. The noise reduction method for range hoods according to claim 1, wherein the optimal effect in the step 2 is a preset noise signal noise reduction amplitude value.
3. The noise reduction method for range hood according to claim 1, wherein in step 4, the feedback transfer function M (V) is fed back0(t),VEar piece(t)) the processing formula is:
Figure FDA0003153202820000032
wherein, VEar piece(t)＝AEar piecesin(ωEar piecet+βEar piece)，V0(t)＝A0sin(ω0t+β0)，AEar pieceFor the noise signal V at the ear positionEar pieceMagnitude of vibration, ω, of (t)Ear pieceFor the noise signal V at the ear positionEar pieceAngular frequency of (t), betaEar pieceFor the noise signal V at the ear positionEar piece(t) an initial phase; a. the0For the reference noise signal V0Magnitude of vibration, ω, of (t)0For the reference noise signal V0Angular frequency of (t), beta0For the reference noise signal V0(t) initial phase.
4. The noise reduction method for range hoods of claim 1, wherein in step 6, the noise transfer function H (n, S) is expressed as follows:
Figure FDA0003153202820000033
wherein, the noise signal at the optimal installation position of the microphone under the stable working condition n in the debugging state
Figure FDA0003153202820000034
Noise signal at reference microphone mounting location when in steady state n in debug state
Figure FDA0003153202820000035
5. The noise reduction method for range hood according to claim 1, wherein in step 7, the range hood is tuned for each speaker error function Δ a of the stable operating condition nnThe processing formula of (1) is as follows:
Figure FDA0003153202820000036
wherein A isnThe optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging statenAt the noise-canceling signal emitted by the loudspeaker
Figure FDA0003153202820000037
The amplitude value of the frequency band,
Figure FDA0003153202820000038
the optimum installation position S of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging statenAt the noise-canceling signal emitted by the loudspeaker
Figure FDA0003153202820000041
Initial phase of (1), RnThe distance value R of the loudspeaker at the optimal installation position of the corresponding loudspeaker when the range hood is in the stable working condition n under the debugging state from the target sound source0The target sound source is a distance value between a loudspeaker at the loudspeaker reference installation position and the target sound source, and the target sound source is a noise signal generated at a position between a fan system and an air inlet of the range hood.
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