CN112361404B - Noise reduction method and system for range hood and range hood with noise reduction system - Google Patents

Noise reduction method and system for range hood and range hood with noise reduction system Download PDF

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CN112361404B
CN112361404B CN202011164390.8A CN202011164390A CN112361404B CN 112361404 B CN112361404 B CN 112361404B CN 202011164390 A CN202011164390 A CN 202011164390A CN 112361404 B CN112361404 B CN 112361404B
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noise
range hood
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rotating speed
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CN112361404A (en
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时璐璐
马志豪
余旭锋
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Ningbo Fotile Kitchen Ware Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • 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
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Abstract

The invention relates to a noise reduction method and a noise reduction system of a range hood and the range hood applying the noise reduction system, which are characterized in that a motor rotating speed-noise signal information mapping relation list is formed in advance, the actual motor rotating speed during the operation of the range hood is matched with the motor rotating speed-noise signal information mapping relation list, the noise signal information corresponding to the actual motor rotating speed is taken as reference noise signal information, then a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information is generated, and the first noise reduction sound wave signal is played, so that the noise signal of a target noise source corresponding to the operation of the motor is indirectly acquired by using the actual motor rotating speed, the interference of other noise except the motor noise on the noise signal acquisition of the target noise source is avoided, and the accuracy of the generated first noise reduction sound wave signal is realized, the main noise signals in the noise of the range hood are effectively offset, and the overall noise reduction effect of the range hood is improved.

Description

Noise reduction method and system for range hood and range hood with noise reduction system
Technical Field
The invention relates to the field of range hoods, in particular to a noise reduction method and a noise reduction system of a range hood and a range hood with the noise reduction system.
Background
The range hood (or called range hood) has become the essential equipment in most family kitchens, and the range hood can discharge the oil smoke in the kitchen environment in time through the work of the range hood, so as to keep the kitchen environment and even the air in the whole indoor environment clean. The range hood can produce the noise usually at the during operation, influences user's use experience effect. 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 self-learning automatic noise reduction method for a range hood, which mainly comprises the following steps: (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 for the range hood disclosed in the patent application CN107289482A of the invention also has the following defects: in an actual kitchen environment, the sound environment in the kitchen may also change. For example, when people in a kitchen environment suddenly increase or a door is opened or closed, noisy sound is generated, the noisy sound and the noise of the whole range hood are mixed and then collected by the noise collector, the mixed noise collected by the noise collector is used as a reference noise source needing noise reduction by the sound signal generator, and then a sound wave signal with the same amplitude and the opposite phase as those of the reference noise source is generated by the sound signal generator so as to be played by the loudspeaker device. Obviously, the noisy sound generated by the non-range hood in the kitchen environment can affect the accurate collection and detection of the noise collector on the reference noise source, so that the sound signal generator generates deviation based on the sound wave signal generated by the affected reference noise source and used for offsetting the noise, the noise reduction of the whole noise of the range hood is difficult to effectively realize, and the user experience effect is affected. In addition, after the range hood works for a long time, the motor bracket for placing the motor can generate abnormal sound different from wind sound due to the operation of the motor, the frequency of the abnormal sound is usually between 90hz and 600hz, and the occurrence of the abnormal sound not only can reduce the noise quality of the range hood, but also can cause harm to human bodies.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a noise reduction method for a range hood aiming at the prior art. According to the noise reduction method for the range hood, the noise signal information corresponding to the current actual rotating speed of the motor is obtained by collecting the actual rotating speed of the motor when the range hood operates, and then the noise reduction signal for offsetting the noise signal is generated, so that the adverse effect of noisy sound in the environment where the noise of the whole range hood is collected directly is avoided, the noise reduction of the range hood is realized, and the user experience effect is improved.
The second technical problem to be solved by the invention is to provide a noise reduction system for realizing the noise reduction method of the range hood.
The third technical problem to be solved by the invention is to provide the range hood with the noise reduction system.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the noise reduction method of the range hood is characterized by comprising the following steps of:
step a, noise signal information of a target noise source corresponding to the motor of the range hood when the motor runs at each rotating speed is obtained in advance, and a motor rotating speed-noise signal information mapping relation list between each rotating speed and the noise signal information of the target noise source is formed; wherein the noise signal information at least comprises the amplitude and phase of the acquired noise signal at the target noise source;
b, detecting the actual motor rotating speed of the range hood during operation;
c, matching and obtaining noise signal information of a target noise source corresponding to the actual motor rotating speed according to the motor rotating speed-noise signal information mapping relation table and the actual motor rotating speed, and taking the noise signal information obtained by matching as reference noise signal information;
and d, generating a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information, and playing the first noise reduction sound wave signal.
The noise reduction method of the range hood obtains the noise signal information corresponding to the actual motor rotating speed by pre-forming a motor rotating speed-noise signal information mapping relation list, matching the detected actual motor rotating speed during the operation of the range hood with the motor rotating speed-noise signal information mapping relation list, taking the noise signal information as reference noise signal information, then generating a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information and playing the first noise reduction sound wave signal, thereby indirectly obtaining the noise signal of a target noise source corresponding to the operation of the motor by utilizing the actual motor rotating speed during the operation of the range hood, avoiding the interference of other noise except the motor noise on the noise signal collection at the target noise source, and realizing the accuracy of the generated first noise reduction sound wave signal, the main noise signals in the noise of the range hood are effectively offset, and the overall noise reduction effect of the range hood is improved.
Considering that the motor bracket for placing the motor can generate noise due to vibration when the motor of the range hood runs, and then the noise signal of the collected target noise source is adversely affected, the range hood noise reduction method is improved, and is characterized by further comprising the following steps:
detecting abnormal frequency points of a motor bracket for placing a motor during vibration;
acquiring vibration acceleration signal information corresponding to the motor support vibrating at an abnormal frequency point; wherein the vibration acceleration signal information comprises the vibration amplitude and the vibration frequency of the vibration acceleration signal;
and generating a second noise reduction sound wave signal for counteracting the vibration acceleration signal corresponding to the vibration acceleration signal information, and playing the second noise reduction sound wave signal.
According to the invention, the abnormal frequency point of the motor support during vibration and the vibration acceleration signal information corresponding to the abnormal frequency point are detected and obtained, the second noise reduction sound wave signal for counteracting the vibration acceleration signal corresponding to the vibration acceleration signal information is generated, and then the second noise reduction sound wave signal is played, so that the removal of noise generated during vibration of the motor support is realized, and the overall noise reduction effect of the range hood is further improved.
Specifically, in the detection situation of the abnormal frequency point, in the noise reduction method of the range hood of the invention, the detection process of the abnormal frequency point is as follows:
detecting the vibration amplitude and the vibration frequency of a vibration acceleration signal corresponding to the motor bracket during vibration;
judging the vibration amplitude and the vibration frequency of each detected vibration acceleration signal:
when the vibration amplitude difference value between the vibration amplitude of the vibration acceleration signal corresponding to any vibration frequency and the vibration amplitude of the vibration acceleration signal corresponding to the adjacent vibration frequency of the vibration frequency is within the preset vibration amplitude difference value range, judging that the vibration frequency is an abnormal frequency point; otherwise, judging that any vibration frequency point is a normal frequency point.
Still further, in the method for reducing the noise of the range hood, the range of the difference value of the vibration amplitudes is [ -1Hz,1Hz ].
Further, in the noise reduction method for the range hood, the target noise source is noise generated by noise generated at a fan system of the range hood.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the noise reduction system for realizing the noise reduction method of the range hood is characterized by comprising the following steps:
the noise acquisition device is used for acquiring a noise signal when a motor of the range hood runs;
the controller is connected with the noise acquisition device, acquires the rotating speed of the motor during operation, forms a motor rotating speed-noise signal information mapping relation list between each rotating speed and noise signal information of a target noise source according to each rotating speed of the motor during operation and the noise signal acquired by the noise acquisition device, obtains reference noise information according to the rotating speed of the motor during operation and the motor rotating speed-noise signal information mapping relation list, and generates a first noise reduction sound wave signal for counteracting the noise signal corresponding to the reference noise information;
and the main loudspeaker is connected with the controller and plays the first noise reduction sound wave signal generated by the controller.
Considering that the motor bracket for placing the motor can generate noisy sound due to vibration when the motor of the range hood runs, and then the noise signal of the collected target noise source is adversely affected, the noise reduction system in the invention further comprises:
the vibration acceleration sensor is connected with the controller and used for detecting a vibration acceleration signal of a motor bracket for placing the motor when the motor bracket vibrates; wherein the controller generates a second noise reducing acoustic wave signal that cancels the vibration acceleration signal;
and the auxiliary loudspeaker is connected with the controller and plays the second noise reduction sound wave signal.
Therefore, the vibration acceleration sensor sends the detected vibration acceleration signal corresponding to the vibration of the motor support to the controller, so that the controller generates a second noise reduction sound wave signal for counteracting the vibration acceleration signal corresponding to the vibration acceleration signal information, and the secondary loudspeaker plays the second noise reduction sound wave signal.
In order to realize the collection and noise reduction processing of noise signals at a fan system which is a target noise source of the range hood, specifically, the noise collection device and the main loudspeaker are both arranged at the fan system of the range hood. Because noise pickup assembly and main speaker have all set up the target noise source, also be the main noise source department of range hood for the target noise signal that noise pickup assembly gathered is more accurate, and then makes the first sound wave signal of making an uproar of falling that the controller generated through the broadcast of main speaker, this target noise signal of offset that can be better, thereby improves the noise reduction effect.
The technical scheme adopted by the invention for solving the third technical problem is as follows: the range hood comprises a motor and is characterized in that the noise reduction system is applied.
In order to further enhance the noise reduction effect, as an improvement, in the range hood of the invention, the fan system comprises a volute and an air inlet, and sound-absorbing cotton is arranged around the volute and at the air inlet.
Compared with the prior art, the invention has the advantages that: the invention obtains the noise signal information corresponding to the actual motor rotating speed by pre-forming a motor rotating speed-noise signal information mapping relation list, matches the detected actual motor rotating speed when the range hood operates with the motor rotating speed-noise signal information mapping relation list, takes the noise signal information as the reference noise signal information, then generates a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information and plays the first noise reduction sound wave signal, thereby indirectly obtaining the noise signal of a target noise source corresponding to the motor operation by utilizing the actual motor rotating speed when the range hood operates, avoiding the interference of other noise except the noise of the motor on the noise signal collection of the target noise source, realizing the accuracy of the generated first noise reduction sound wave signal, the main noise signals in the noise of the range hood are effectively offset, and the overall noise reduction effect of the range hood is improved.
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Fig. 1 is a schematic flow chart of a noise reduction method of a range hood in the embodiment;
fig. 2 is a schematic diagram of the noise reduction system in the present embodiment.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the embodiment provides a noise reduction method for a range hood. Specifically, the noise reduction method of the range hood is characterized by comprising the following steps of:
step a, noise signal information of a target noise source corresponding to the motor of the range hood when the motor runs at each rotating speed is obtained in advance, and a motor rotating speed-noise signal information mapping relation list between each rotating speed and the noise signal information of the target noise source is formed; wherein, the target noise source in the embodiment is noise generated at a fan system of the range hood.
The noise signal information at least comprises the amplitude and the phase of the acquired noise signal at the target noise source;
that is, the rotation speed of the motor and the noise signal information of the corresponding target noise source are in a one-to-one correspondence relationship, for example, when the range hood is operated for the first time, the motor is at the rotation speed RPM1Noise signal information of the corresponding target Noise source is Noise1At RPM of the motor2Noise signal information of the corresponding target Noise source is Noise2… …, Motor at RPMKNoise signal of target noise source corresponding to timeInformation is NoiseKWhere K is the total number of all the rotating speeds corresponding to the motor running, i.e. the rotating speed RPMkNoise signal information of the corresponding target Noise source is NoisekK is more than or equal to 1 and less than or equal to K; in this way, the following motor speed-Noise signal information mapping relation list RPM-Noise is formed:
RPM1→Noise1，RPM2→Noise2，RPM3→Noise3，……，RPMK→NoiseK；
in addition, Noise signal information NoisekIncluding at least the amplitude of the noise signal at the target noise source
Figure BDA0002745276680000054
And phase
Figure BDA0002745276680000051
B, detecting the actual motor rotating speed of the range hood during operation; for example, after the range hood is operated, the detected actual motor speed of the range hood during operation is rpm;
c, matching to obtain noise signal information of a target noise source corresponding to the actual motor rotating speed according to the motor rotating speed-noise signal information mapping relation table and the actual motor rotating speed, and taking the noise signal information obtained by matching as reference noise signal information;
the current actual motor rotating speed of the range hood which is detected is the RPM, then the actual motor rotating speed RPM is matched with the formed motor rotating speed-Noise signal information mapping relation list RPM-Noise, if the actual motor rotating speed RPM is matched with the rotating speed RPM in the motor rotating speed-Noise signal information mapping relation list RPM-Noise, the current actual motor rotating speed of the range hood is the RPM, and if the actual motor rotating speed RPM is not matched with the rotating speed RPM-Noise signal information, the current actual motor rotating speed of the range hood is the RPM, and the current motor rotating speed is the RPM, the actual motor rotating speed RPM is matched with the RPM-Noise signal information mapping relation list RPM-Noise, and the current rotating speed is the RPM, and the actual motor rotating speed-Noise signal information is the Noise signal information mapping relation list RPM-Noise signal information of the range hood3Equivalent, i.e. RPM to RPM3Then, the rotation speed is RPM3Noise signal information Noise of the corresponding target Noise source3As reference noise signal information;
d, generating a first noise reduction sound wave signal for canceling the noise signal corresponding to the reference noise signal information,and playing the first noise reduction sound wave signal. I.e. due to the fact that the reference Noise signal information Noise has been obtained in step c3Then the reference Noise signal information Noise is obtained3Amplitude of (2)
Figure BDA0002745276680000052
And phase
Figure BDA0002745276680000053
Then generating a first noise reduction sound wave signal for counteracting a noise signal corresponding to the reference noise signal information; wherein the amplitude of the first Noise reduction sound wave signal and the Noise reference signal information Noise3Is equal to the amplitude of the first Noise reduction sound wave signal, and the phase of the first Noise reduction sound wave signal is equal to the reference Noise signal information Noise3Phase of
Figure BDA0002745276680000061
On the contrary, by playing the first Noise reduction sound wave signal, the reference Noise signal information Noise can be obtained3And the noise is offset, so that the noise generated by the target noise source of the range hood is reduced.
Certainly, when considering that the motor of the range hood runs, the motor bracket for placing the motor can also generate noisy sound due to vibration, and then generate adverse effect on the noise signal of the collected target noise source, and the range hood noise reduction method of the embodiment further comprises the following steps:
detecting abnormal frequency points of a motor bracket for placing a motor during vibration;
acquiring vibration acceleration signal information corresponding to the motor support vibrating at an abnormal frequency point; wherein the vibration acceleration signal information comprises the vibration amplitude and the vibration frequency of the vibration acceleration signal;
and generating a second noise reduction sound wave signal for counteracting the vibration acceleration signal corresponding to the vibration acceleration signal information, and playing the second noise reduction sound wave signal. It should be noted that, in this embodiment, the detection process of the abnormal frequency point is as follows:
detecting the vibration amplitude and the vibration frequency of a vibration acceleration signal corresponding to the motor bracket during vibration;
judging the vibration amplitude and the vibration frequency of each detected vibration acceleration signal:
when the vibration amplitude difference value between the vibration amplitude of the vibration acceleration signal corresponding to any vibration frequency and the vibration amplitude of the vibration acceleration signal corresponding to the adjacent vibration frequency of the vibration frequency is within the preset vibration amplitude difference value range, judging that the vibration frequency is an abnormal frequency point; otherwise, judging that any vibration frequency point is a normal frequency point.
For example, among all the vibration acceleration signals detected, the vibration acceleration signal is at the vibration frequency fnAmplitude of vibration corresponding to time
Figure BDA0002745276680000062
With the vibration frequency fnAdjacent vibration frequency fn+1Vibration amplitude of corresponding vibration acceleration signal
Figure BDA0002745276680000063
Difference in vibration amplitude between
Figure BDA0002745276680000064
Within a preset vibration amplitude difference range of [ -1Hz,1Hz]Internal, then, the vibration frequency f is adjustednAnd judging the abnormal frequency point.
The noise reduction method of the range hood of the embodiment obtains the noise signal information corresponding to the actual motor rotation speed by pre-forming a motor rotation speed-noise signal information mapping relation list, matching the detected actual motor rotation speed during the operation of the range hood with the motor rotation speed-noise signal information mapping relation list, taking the noise signal information as the reference noise signal information, then generating a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information and playing the first noise reduction sound wave signal, thereby indirectly obtaining the noise signal of the target noise source corresponding to the operation of the motor by using the actual motor rotation speed during the operation of the range hood, avoiding the interference of other noisy noise except the motor noise on the noise signal acquisition at the target noise source, and realizing the accuracy of the generated first noise reduction sound wave signal, the main noise signals in the noise of the range hood are effectively offset, and the overall noise reduction effect of the range hood is improved.
The embodiment also provides a noise reduction system for realizing the noise reduction method of the range hood. Referring to fig. 2, the noise reduction system includes:
the noise acquisition device 11 is used for acquiring a noise signal when a motor of the range hood runs; specifically, the noise collection device 11 is responsible for collecting a noise signal of the range hood during the first operation and a noise signal of the range hood during the subsequent operation;
the controller 12 is connected with the noise acquisition device 11, acquires the rotating speed of the motor during operation, forms a motor rotating speed-noise signal information mapping relation list between each rotating speed and noise signal information of a target noise source according to each rotating speed of the motor during operation and the noise signal acquired by the noise acquisition device, acquires reference noise information according to the rotating speed of the motor during operation and the motor rotating speed-noise signal information mapping relation list, and generates a first noise reduction sound wave signal for counteracting the noise signal corresponding to the reference noise information;
the main loudspeaker 13 is connected with the controller 12 and plays the first noise reduction sound wave signal generated by the controller 12;
a vibration acceleration sensor 14 connected with the controller 12 for detecting a vibration acceleration signal of the motor bracket for placing the motor during vibration; wherein the controller 12 generates a second noise reduction sound wave signal that cancels the vibration acceleration signal;
and the auxiliary loudspeaker 15 is connected with the controller 12 and plays the second noise reduction sound wave signal. Wherein, the noise collecting device 11 and the main loudspeaker 13 are both arranged at the fan system of the range hood.
After the noise reduction system is installed on the range hood, the controller 12 forms a motor rotation speed-noise signal information mapping relation list between each rotation speed and noise signal information of a target noise source according to the noise signal acquired by the noise acquisition device 11 during the initial operation of the range hood and the corresponding rotation speed, then the controller 12 obtains the noise signal information corresponding to the actual motor rotation speed during the operation of the range hood according to the noise signal acquired by the noise acquisition device 11 during the subsequent operation of the range hood, takes the noise signal information as reference noise signal information, then generates a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information, and plays the first noise reduction sound wave signal at a fan system of the range hood by the main speaker 13. Therefore, the noise signal of the target noise source corresponding to the operation of the motor can be indirectly acquired by utilizing the actual motor rotating speed during the operation of the range hood, the interference of other noisy sounds except the motor noise on the noise signal acquisition of the target noise source is avoided, the accuracy of the generated first noise reduction sound wave signal is realized, the main noise signal in the noise of the range hood is effectively offset, and the overall noise reduction effect of the range hood is improved.
In addition, the embodiment also provides a range hood, which not only comprises a motor, but also is applied with the noise reduction system. The fan system of the range hood comprises a volute and an air inlet, and sound-absorbing cotton is arranged around the volute and at the air inlet. Through the sound cotton of inhaling that sets up here, can reach the effect of making an uproar further falls to fan system department. In addition, by arranging the sound-absorbing cotton, the accuracy of the noise signal information of the target noise source collected by the noise collection device 11 can be further ensured, and the cancellation and noise reduction effect of the generated first noise reduction sound wave signal on the noise signal of the target noise source can be further enhanced.

Claims (7)

1. The noise reduction method of the range hood is characterized by comprising the following steps of:
step a, noise signal information of a target noise source corresponding to the motor of the range hood when the motor runs at each rotating speed is obtained in advance, and a motor rotating speed-noise signal information mapping relation list between each rotating speed and the noise signal information of the target noise source is formed; wherein the noise signal information at least comprises the amplitude and phase of the acquired noise signal at the target noise source;
b, detecting the actual motor rotating speed of the range hood during operation;
c, matching and obtaining noise signal information of a target noise source corresponding to the actual motor rotating speed according to the motor rotating speed-noise signal information mapping relation table and the actual motor rotating speed, and taking the noise signal information obtained by matching as reference noise signal information;
d, generating a first noise reduction sound wave signal for offsetting the noise signal corresponding to the reference noise signal information, and playing the first noise reduction sound wave signal;
and the noise reduction method of the range hood further comprises the following steps:
detecting abnormal frequency points of a motor bracket for placing a motor during vibration; the detection process of the abnormal frequency point is as follows: detecting the vibration amplitude and the vibration frequency of a vibration acceleration signal corresponding to the motor bracket during vibration; judging the vibration amplitude and the vibration frequency of each detected vibration acceleration signal: when the vibration amplitude difference value between the vibration amplitude of the vibration acceleration signal corresponding to any vibration frequency and the vibration amplitude of the vibration acceleration signal corresponding to the adjacent vibration frequency of the vibration frequency is within the preset vibration amplitude difference value range, judging that the vibration frequency is an abnormal frequency point; otherwise, judging that any vibration frequency point is a normal frequency point;
acquiring vibration acceleration signal information corresponding to the motor support vibrating at an abnormal frequency point; wherein the vibration acceleration signal information comprises the vibration amplitude and the vibration frequency of the vibration acceleration signal;
and generating a second noise reduction sound wave signal for counteracting the vibration acceleration signal corresponding to the vibration acceleration signal information, and playing the second noise reduction sound wave signal.
2. A range hood noise reduction method according to claim 1, characterized in that said preset vibration amplitude difference range is [ -1m/s ]2,1m/s2]。
3. The range hood noise reduction method according to claim 1 or 2, wherein the target noise source is noise generated at a fan system of the range hood.
4. The noise reduction system for realizing the noise reduction method of the range hood of claim 1, is characterized by comprising the following steps:
the noise acquisition device (11) is used for acquiring a noise signal when a motor of the range hood runs;
the controller (12) is connected with the noise acquisition device (11), acquires the rotating speed of the motor during operation, forms a motor rotating speed-noise signal information mapping relation list between each rotating speed and noise signal information of a target noise source according to each rotating speed of the motor during operation and the noise signal acquired by the noise acquisition device, obtains reference noise information according to the rotating speed of the motor during operation and the motor rotating speed-noise signal information mapping relation list, and generates a first noise reduction sound wave signal for counteracting the noise signal corresponding to the reference noise information;
the main loudspeaker (13) is connected with the controller (12) and plays the first noise reduction sound wave signal generated by the controller (12);
the vibration acceleration sensor (14) is connected with the controller (12) and is used for detecting a vibration acceleration signal of a motor bracket for placing a motor during vibration; wherein the controller (12) generates a second noise reducing sonic signal that cancels the vibratory acceleration signal;
and the auxiliary loudspeaker (15) is connected with the controller (12) and plays the second noise reduction sound wave signal.
5. The noise reduction system according to claim 4, wherein the noise collection device (11) and the main speaker (13) are both disposed at a fan system of the range hood.
6. Extractor hood comprising an electric motor, characterized in that a noise reduction system according to claim 4 or 5 is applied.
7. The range hood of claim 6, wherein the fan system comprises a volute and an air inlet, and sound absorbing cotton is arranged around the volute and at the air inlet.
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