A noise reduction method for a range hood

Abstract

The application relates to a noise reduction method of an oil fume extractor, which comprises the following steps: determining the installation position of a sound signal emitting device on the oil fume extractor, and selecting the installation positions of a sound signal collecting device and an error signal collecting device from a set A of installation positions respectively; then, calculating the signal depth value collected by the error signal collecting device and the coherence between a first noise signal collected by the sound signal collecting device and a second noise signal collected by the error signal collecting device; comparing the coherence with a first preset value and the signal depth value with a second preset value respectively to confirm the optimal positions of the sound signal collecting device and the error signal collecting device; finally, a controller analyzes the noise signals collected by the sound signal collecting device and the error signal collecting device at the optimal positions, and controls the sound signal emitting device to emit corresponding noise reduction sound waves to realize noise reduction. The method can improve the noise reduction effect and meet the optimal noise reduction in different installation scenes.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a method for reducing noise in range hoods. Background Technology

[0002] Currently, range hoods have become an essential appliance in most family kitchens. However, when range hoods are working, the operation and vibration of the fan inside the range hood usually generate noise, which affects the user experience.

[0003] Existing noise reduction methods mainly include passive noise reduction and active noise reduction. However, current passive noise reduction methods are effective within a fixed noise reduction frequency band, and have no or limited noise reduction effect beyond that band. Active noise reduction, on the other hand, achieves phase cancellation by emitting sound waves with the same frequency and amplitude but opposite phase to the noise and interfering with the noise, thus achieving noise reduction. Therefore, active noise reduction is more effective than passive noise reduction.

[0004] For example, Chinese invention patents CN201410798435.5 (publication number CN104534532A) entitled "A Noise Reduction Device for a Range Hood" and CN202011551460.5 (authorization announcement number CN112669806B) entitled "An Active Noise Reduction Device for an Integrated Stove" both disclose active noise reduction methods. Both of these noise reduction devices include a reference microphone (also known as a sound signal acquisition device or reference sensor) and an error microphone (i.e., an error signal acquisition device). The active noise cancellation system typically uses a combination of a reference microphone (or reference sensor) and a loudspeaker (also known as a sound signal transmitter). The loudspeaker is usually installed inside the range hood. However, due to the limited space inside the range hood, the locations of the sound transmitter are essentially limited. In existing technologies, the reference microphone and error microphone are usually installed in fixed or arbitrarily selected positions, which cannot be adjusted to the optimal position based on different range hood models, installation locations, or other installation scenarios. This means the entire noise cancellation system may not achieve the best noise reduction effect. Therefore, further improvements to the existing technology are needed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a noise reduction method for a range hood that can improve the noise reduction effect, in contrast to the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a noise reduction method for a range hood, used to reduce the noise generated during the operation of the range hood using a noise reduction system, wherein the noise reduction system includes:

[0007] A sound signal acquisition device is used to acquire a first noise signal;

[0008] An error signal acquisition device is used to acquire the second noise signal;

[0009] A sound signal transmitting device used to transmit noise-reduced signals;

[0010] The controller is connected to the sound signal acquisition device, the error signal acquisition device, and the sound signal transmission device, and is configured to: analyze the acquired first noise signal and the acquired second noise signal to generate a corresponding noise reduction signal, and then control the sound signal transmission device to emit a corresponding noise reduction wave;

[0011] Its features are:

[0012] The noise reduction method for the range hood includes the following steps:

[0013] Step 1: Determine the installation location of the sound signal transmitting device on the range hood, and preset the set A of installation locations of the sound signal acquisition device and the error signal acquisition device on the range hood;

[0014] Step 2: Select the m-th installation location from the installation location set A and use it as the current installation location of the sound signal acquisition device; and select the n-th installation location from the installation location set A and use it as the current installation location of the error signal acquisition device; where m, n∈{1, 2, ... i}, and i is the total number of installation locations in the installation location set A.

[0015] Step 3: After the range hood is turned on, acquire the first noise signal x(a) collected when the sound signal acquisition device is in the m-th installation position. m ), and acquire the second noise signal x(b) collected when the error signal acquisition device is in the nth installation position. n );

[0016] Step 4: Calculate the signal depth value h and the first noise signal x(a) acquired by the error signal acquisition device. m ) and the second noise signal x(b) n coherence w n ;

[0017] Step 5: Separately, the coherence w n The optimal positions of the sound signal acquisition device and the error signal acquisition device are determined by comparing the first preset value p with the signal depth value h and the second preset value q; where 0 < p ≤ 1, q > 0.

[0018] Step 6: Install the sound signal acquisition device and the error signal acquisition device at the optimal positions confirmed in Step 5. During the operation of the range hood, the sound signal acquisition device and the error signal acquisition device collect noise signals in real time and transmit the corresponding noise signals to the controller. The controller analyzes the noise signals collected by the sound signal acquisition device and the error signal acquisition device, and finally controls the sound signal transmitter to emit the corresponding noise reduction wave to achieve noise reduction.

[0019] In order to improve the efficiency of optimal position confirmation of the sound signal acquisition device and the error signal acquisition device, the preferred first scheme is that the value of m in step 2 is a fixed value, and n is an arbitrarily selected value.

[0020] Preferably, the value of m is determined based on the installation location of the sound signal transmitting device.

[0021] In this scheme, the formula for calculating the signal depth value h in step 4 is:

[0022] h = x(b) n+1 )-x(b n ).

[0023] To confirm the optimal positions of the sound signal acquisition device and the error signal acquisition device, the specific control logic in step 5 is as follows:

[0024] If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position;

[0025] If w n If p ≥ and h < q, then the optimal position of the error signal acquisition device is determined, that is, the error signal acquisition device is installed at the nth installation position, and the position of the sound signal acquisition device is adjusted.

[0026] If w n If the value is less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted separately.

[0027] Furthermore, after the position of the error signal acquisition device is determined and the position of the sound signal acquisition device is adjusted, the following steps are also included:

[0028] Following the same method as steps 3-5 above, after the range hood is turned on, acquire the first noise signal collected after adjusting the position of the sound signal acquisition device, and use the re-acquired first noise signal to calculate the signal depth value and coherence. If w nIf w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; if w n If p ≥ q and h < q, then continue adjusting the position of the sound signal acquisition device until the optimal position of the sound signal acquisition device is found.

[0029] In order to improve the efficiency of optimal position confirmation of the sound signal acquisition device and the error signal acquisition device, the second preferred scheme is: in step 2, the value of m is arbitrarily selected, and n is a determined value.

[0030] Furthermore, the value of n is determined based on the installation location of the sound signal transmitting device.

[0031] In this scheme, the formula for calculating the signal depth value h in step 4 is:

[0032] h = x(b) m+1 )-x(b m ).

[0033] To confirm the optimal positions of the sound signal acquisition device and the error signal acquisition device, the specific control logic in step 5 is as follows:

[0034] If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position.

[0035] If w n If p ≥ and h < q, then the optimal position of the sound signal acquisition device is determined, that is, the sound signal acquisition device is installed at the m-th installation position, and the position of the error signal acquisition device is adjusted.

[0036] If w n If the value is less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted separately.

[0037] Furthermore, after the location of the sound signal acquisition device is determined and the location of the error signal acquisition device is adjusted, the following steps are also included:

[0038] Following the same method as steps 3-5 above, after the range hood is turned on, acquire the second noise signal after adjusting the position of the error signal acquisition device, and use the re-acquired second noise signal to calculate the signal depth value and coherence. If w n If w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; if w n If p ≥ q and h < q, then continue adjusting the position of the error signal acquisition device until the optimal position of the error signal acquisition device is found.

[0039] To achieve optimal noise reduction, at least one of the sound signal transmitting device, sound signal acquiring device, and error signal acquiring device in step 1 is located inside or outside the airflow channel of the range hood.

[0040] In this scheme, the installation location of the sound signal transmitting device in step 1, as well as the set A of installation locations corresponding to the sound signal acquisition device and the error signal acquisition device, are all obtained based on historical experience.

[0041] Compared with existing technologies, the advantages of this invention are as follows: After determining the installation location of the sound signal transmitting device, the noise reduction effect can be effectively detected by comparing coherence and signal depth values, thereby confirming the optimal positions of the error signal acquisition device and the sound signal acquisition device. Therefore, this noise reduction method improves the noise reduction effect by finding the optimal positions of the error signal acquisition device and the sound signal acquisition device, thus meeting the optimal noise reduction requirements for different installation scenarios. Attached Figure Description

[0042] Figure 1 This is a flowchart of the noise reduction method for a range hood in Embodiment 1 of the present invention. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] Example 1:

[0045] In this embodiment, a noise reduction system is used to reduce the noise generated during the operation of the range hood. The noise reduction system includes a sound signal acquisition device, an error signal acquisition device, a sound signal transmission device, and a controller. The sound signal acquisition device is used to acquire a first noise signal, and the error signal acquisition device is used to acquire a second noise signal. The sound signal transmission device is used to transmit a noise-reduced signal. The controller is connected to the sound signal acquisition device, the error signal acquisition device, and the sound signal transmission device, and is configured to analyze the acquired first and second noise signals to generate a corresponding noise-reduced signal, and then control the sound signal transmission device to emit the corresponding noise-reduced wave.

[0046] In this embodiment, the sound signal acquisition device is a reference microphone, the error signal acquisition device is an error microphone, and the sound signal transmission device is a loudspeaker.

[0047] like Figure 1 As shown, the noise reduction method for the range hood in this embodiment includes the following steps:

[0048] Step 1: Determine the installation location of the sound signal transmitting device on the range hood, and preset the set A of installation locations of the sound signal acquisition device and the error signal acquisition device on the range hood;

[0049] At least one of the aforementioned sound signal transmitting device, sound signal acquiring device, and error signal acquiring device is located inside or outside the airflow channel of the range hood; in this embodiment, the installation position of the sound signal transmitting device and the set A of installation positions corresponding to the sound signal acquiring device and the error signal acquiring device are all obtained based on historical experience.

[0050] Step 2: Select the m-th installation location from the installation location set A and use it as the current installation location of the sound signal acquisition device; and select the n-th installation location from the installation location set A and use it as the current installation location of the error signal acquisition device; where m, n∈{1, 2, ... i}, and i is the total number of installation locations in the installation location set A.

[0051] To improve the efficiency of determining the optimal position of the sound signal acquisition device and the error signal acquisition device, the value of m is a fixed value, and n is an arbitrarily selected value. That is, the position of the error signal acquisition device is determined first, and then the position of the sound signal acquisition device is optimized. In this embodiment, the value of m is 1. Of course, a more suitable value can be determined based on the installation position of the sound signal transmitter according to the value of m.

[0052] Step 3: After the range hood is turned on, acquire the first noise signal x(a) collected when the sound signal acquisition device is in the m-th installation position. m ), and acquire the second noise signal x(b) collected when the error signal acquisition device is in the nth installation position. n );

[0053] Step 4: Calculate the signal depth value h and the first noise signal x(a) acquired by the error signal acquisition device. m ) and the second noise signal x(b) n coherence w n ;

[0054] In this embodiment, the formula for calculating the signal depth value h is:

[0055] h = x(b) n+1 )-x(b n );

[0056] The above formula for calculating coherence is existing technology and will not be elaborated further here;

[0057] Step 5: Separately, the coherence w nThe optimal positions of the sound signal acquisition device and the error signal acquisition device are determined by comparing the first preset value p, the signal depth value h, and the second preset value q; where 0 < p ≤ 1, q > 0; the above p value can be selected according to different noise sources, and the q value can be selected according to different noise reduction effects desired.

[0058] The specific control logic is as follows:

[0059] If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position.

[0060] If w n If p ≥ q and h < q, then the optimal position of the error signal acquisition device is determined, i.e., the error signal acquisition device is installed at the nth installation position, and the position of the sound signal acquisition device is adjusted. After the position of the error signal acquisition device is determined and the position of the sound signal acquisition device is adjusted, the following steps are also included:

[0061] Following the same method as steps 3-5 above, after the range hood is turned on, acquire the first noise signal collected after adjusting the position of the sound signal acquisition device, and use the re-acquired first noise signal to calculate the signal depth value and coherence. If w n If w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; if w n If p ≥ q and h < q, then continue to adjust the position of the sound signal acquisition device until the optimal position of the sound signal acquisition device is found.

[0062] If w n If the error signal acquisition device and the sound signal acquisition device are less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted respectively. The adjustment process of the error signal acquisition device and the sound signal acquisition device can refer to the adjustment process of the sound signal acquisition device, which will not be elaborated here.

[0063] Step 6: Install the sound signal acquisition device and the error signal acquisition device at the optimal positions confirmed in Step 5. During the operation of the range hood, the sound signal acquisition device and the error signal acquisition device collect noise signals in real time and transmit the corresponding noise signals to the controller. The controller analyzes the noise signals collected by the sound signal acquisition device and the error signal acquisition device, and finally controls the sound signal transmitter to emit the corresponding noise reduction wave to achieve noise reduction.

[0064] Example 2:

[0065] Unlike Embodiment 1, in this embodiment, the value of m is an arbitrarily selected value, and n is a determined value. The value of n is determined based on the installation position of the sound signal transmitting device. That is, the position of the sound signal acquisition device is first determined, and then the position of the error signal acquisition device is optimized and confirmed. This confirmation step is the reverse of that in Embodiment 1.

[0066] The formula for calculating the signal depth value h in step 3 of this embodiment is as follows:

[0067] h = x(b) m+1 )-x(b m );

[0068] In addition, the specific control logic in step 5 is as follows:

[0069] If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position.

[0070] If w n If p ≥ q and h < q, then the optimal position of the sound signal acquisition device is determined, i.e., the sound signal acquisition device is installed at the m-th installation position, and the position of the error signal acquisition device is adjusted. After the position of the sound signal acquisition device is determined and the position of the error signal acquisition device is adjusted, the following steps are also included:

[0071] Following the same method as steps 3-5 above, after the range hood is turned on, acquire the second noise signal after adjusting the position of the error signal acquisition device, and use the re-acquired second noise signal to calculate the signal depth value and coherence. If w n If w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; if w n If p ≥ q and h < q, then continue to adjust the position of the error signal acquisition device until the optimal position of the error signal acquisition device is found.

[0072] If w n If the value is less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted separately.

[0073] In this embodiment, the optimal positions of the error signal acquisition device and the sound signal acquisition device are determined so that the entire noise reduction system can achieve the best noise reduction effect. The positions can be changed according to different installation scenarios of the range hood, thereby solving the problem of limited noise reduction effect caused by the fixed position of the sound signal acquisition device and / or the error signal acquisition device.

Claims

1. A noise reduction method for a range hood, used to reduce the noise generated during the operation of the range hood using a noise reduction system, wherein the noise reduction system includes: A sound signal acquisition device is used to acquire a first noise signal; An error signal acquisition device is used to acquire the second noise signal; A sound signal transmitting device used to transmit noise-reduced signals; The controller is connected to the sound signal acquisition device, the error signal acquisition device, and the sound signal transmission device, and is configured to: analyze the acquired first noise signal and the acquired second noise signal to generate a corresponding noise reduction signal, and then control the sound signal transmission device to emit a corresponding noise reduction wave; Its features are: The noise reduction method for the range hood includes the following steps: Step 1: Determine the installation location of the sound signal transmitting device on the range hood, and preset the set A of installation locations of the sound signal acquisition device and the error signal acquisition device on the range hood; Step 2: Select the m-th installation location from the installation location set A and use it as the current installation location of the sound signal acquisition device; and select the n-th installation location from the installation location set A and use it as the current installation location of the error signal acquisition device. Where m, n∈{1, 2, ..., i}, and i is the total number of installation locations in the installation location set A; Step 3: After the range hood is turned on, acquire the first noise signal x(a) collected when the sound signal acquisition device is in the m-th installation position. m ), and acquire the second noise signal x(b) collected when the error signal acquisition device is in the nth installation position. n ); Step 4: Calculate the signal depth value h and the first noise signal x(a) acquired by the error signal acquisition device. m ) and the second noise signal x(b) n coherence w n ; Step 5: Separately, the coherence w n The optimal positions of the sound signal acquisition device and the error signal acquisition device are determined by comparing the first preset value p with the signal depth value h with the second preset value q; where 0 < p ≤ 1, q >

0. Step 6: Install the sound signal acquisition device and the error signal acquisition device at the optimal positions confirmed in Step 5. During the operation of the range hood, the sound signal acquisition device and the error signal acquisition device collect noise signals in real time and transmit the corresponding noise signals to the controller. The controller analyzes the noise signals collected by the sound signal acquisition device and the error signal acquisition device, and finally controls the sound signal transmitter to emit the corresponding noise reduction wave to achieve noise reduction.

2. The noise reduction method for a range hood according to claim 1, characterized in that: In step 2, m is a fixed value, and n is an arbitrarily selected value.

3. The noise reduction method for a range hood according to claim 2, characterized in that: The value of m is determined based on the installation location of the sound signal transmitting device.

4. The noise reduction method for a range hood according to claim 3, characterized in that: The formula for calculating the signal depth value h in step 4 is as follows: h=x(b n+1 )-x(b n )。 5. The noise reduction method for a range hood according to claim 4, characterized in that: The specific control logic in step 5 is as follows: If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position. If w n If p ≥ and h < q, then the optimal position of the error signal acquisition device is determined, that is, the error signal acquisition device is installed at the nth installation position, and the position of the sound signal acquisition device is adjusted. If w n If the value is less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted separately.

6. The noise reduction method for a range hood according to claim 5, characterized in that: After the position of the error signal acquisition device is determined and the position of the sound signal acquisition device is adjusted, the following steps are also included: Following the same method as steps 3-5 above, after the range hood is turned on, acquire the first noise signal collected after adjusting the position of the sound signal acquisition device, and use the re-acquired first noise signal to calculate the signal depth value and coherence. If w n If w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; n If p ≥ q and h < q, then continue adjusting the position of the sound signal acquisition device until the optimal position of the sound signal acquisition device is found.

7. The noise reduction method for a range hood according to claim 1, characterized in that: In step 2, m is an arbitrarily selected value, and n is a fixed value.

8. The noise reduction method for a range hood according to claim 7, characterized in that: The value of n is determined based on the installation location of the sound signal transmitting device.

9. The noise reduction method for a range hood according to claim 8, characterized in that: The formula for calculating the signal depth value h in step 4 is as follows: h=x(b m+1 )-x(b m )。 10. The noise reduction method for a range hood according to claim 9, characterized in that: The specific control logic in step 5 is as follows: If w n If p ≥ q and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined, that is: the sound signal acquisition device is confirmed to be installed at the m-th installation position, and the error signal acquisition device is confirmed to be installed at the n-th installation position. If w n If p ≥ and h < q, then the optimal position of the sound signal acquisition device is determined, that is, the sound signal acquisition device is installed at the m-th installation position, and the position of the error signal acquisition device is adjusted. If w n If the value is less than p, then the positions of the error signal acquisition device and the sound signal acquisition device need to be adjusted separately.

11. The noise reduction method for a range hood according to claim 10, characterized in that: After the location of the sound signal acquisition device is determined and the location of the error signal acquisition device is adjusted, the following steps are also included: Following the same method as steps 3-5 above, after the range hood is turned on, acquire the second noise signal after adjusting the position of the error signal acquisition device, and use the re-acquired second noise signal to calculate the signal depth value and coherence. If w n If w ≥ p and h ≥ q, then the optimal positions of both the sound signal acquisition device and the error signal acquisition device are determined; n If p ≥ q and h < q, then continue adjusting the position of the error signal acquisition device until the optimal position of the error signal acquisition device is found.

12. The noise reduction method for a range hood according to any one of claims 1 to 11, characterized in that: At least one of the sound signal transmitting device, sound signal acquiring device, and error signal acquiring device in step 1 is located inside or outside the airflow channel of the range hood.

13. The noise reduction method for a range hood according to claim 12, characterized in that: The installation locations of the sound signal transmitting device and the set A of installation locations corresponding to the sound signal acquisition device and the error signal acquisition device in step 1 are all obtained based on historical experience.

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