Range hood, noise reduction method, system and storage medium thereof

Abstract

The present invention discloses a range hood and its noise reduction method, system, and storage medium. The method comprises: obtaining a target sampling rate and a target sound velocity; collecting the actual sound velocity corresponding to the current gear; determining the current sampling rate corresponding to the current gear based on the target sound velocity, the target sampling rate, and the actual sound velocity; sending a noise compensation signal based on the current sampling rate, and using the identified noise reduction parameters to reduce the noise of the range hood. The present invention collects the actual sound velocity and the target sound velocity, determines the current sampling rate corresponding to the current gear based on the target sampling rate, and then uses the identified noise reduction parameters to reduce the noise of the range hood. The method considers the impact of the sound velocity on the current sampling rate, improves the matching degree between the current operating condition and the noise reduction parameters without increasing the workload of noise reduction parameter identification, thereby enhancing the user experience and protecting the user's physical and mental health.

Description

Technical Field

[0001] The present invention relates to the field of range hoods, and in particular to a range hood and a noise reduction method, system and storage medium thereof. Background Art

[0002] In order to improve the oil fume extraction effect, the air volume and wind speed of existing range hoods are constantly increasing, but this has brought about the problem of increased noise, affecting user experience and physical and mental health.

[0003] There are two existing methods for reducing noise from range hoods. One method is to arrange sound-absorbing materials inside the range hood air duct to reduce noise, but this method is not effective in controlling low-frequency noise. Another method is to use active noise reduction, that is, to arrange microphones and speakers inside the range hood air duct to identify and offset noise. Active noise reduction is a noise control technology that can effectively reduce the level of low-frequency noise.

[0004] For cost and noise reduction effect considerations, active noise reduction methods usually use offline identification to obtain noise reduction parameters, that is, offline noise reduction parameter identification is performed only before active noise reduction. The usual practice is to set several wind speed gears for noise reduction parameter identification, obtain the gear wind speed, calculate the corresponding noise reduction parameters, and select the closest noise reduction parameters as the identified noise reduction parameters for noise reduction in subsequent work. The existing noise reduction method does not take into account the influencing factors such as the wind speed Doppler effect. Under actual working conditions, due to the existence of a public flue and changes in air pressure, the actual wind speed inside the range hood may not match the previous measured value. In addition, changes in temperature and humidity in the flue will cause errors between the noise reduction parameters selected in actual work and the identified noise reduction parameters. This difference will reduce the noise reduction effect.

[0005] Although the error of the noise reduction parameters can be reduced by measuring the noise reduction parameters at multiple gears, this will greatly increase the workload of identification. In addition, since the actual wind speed or actual temperature and humidity conditions are different from those during identification, the noise reduction parameters may also be inaccurate. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the problem in the prior art that the wind speed Doppler effect is not taken into account when using identified noise reduction parameters for noise reduction. When the actual wind speed inside the range hood does not match the previous measured value, or when the temperature and humidity in the range hood flue change, the current operating condition of the range hood will not match the noise reduction parameters, thereby reducing the noise reduction effect and affecting the user experience and physical and mental health. A range hood and its noise reduction method, system and storage medium are provided.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] In a first aspect, a noise reduction method for a range hood is provided, the noise reduction method comprising the following steps:

[0009] Obtain a target sampling rate and a target sound speed; wherein the target gear is any one of all gears, the target sampling rate is used to represent the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when identifying the noise reduction parameters;

[0010] Collect the actual sound speed corresponding to the current gear;

[0011] Determining a current sampling rate corresponding to a current gear position according to the target sound speed, the target sampling rate, and the actual sound speed;

[0012] A noise compensation signal is sent according to the current sampling rate, and the identified noise reduction parameters are used to reduce the noise of the range hood.

[0013] The noise reduction method of the range hood of the present invention collects the actual sound velocity corresponding to the current gear of the range hood, and determines the current sampling rate corresponding to the current gear according to the target sound velocity, the target sampling rate and the actual sound velocity, and then adjusts the frequency of sending the noise compensation signal according to the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood; the actual sound velocity of the range hood is collected, and the current sampling rate is determined in combination with the target sampling rate and the target sound velocity, which improves the matching degree between the current working condition and the noise reduction parameters without increasing the workload of noise reduction parameter identification, thereby improving the noise reduction effect of the range hood, improving the user experience, and ensuring the physical and mental health of the user.

[0014] Preferably, the step of collecting the actual sound speed corresponding to the current gear position specifically includes: collecting the actual sound speed corresponding to the current gear position once every period of time.

[0015] The noise reduction method of the range hood of the present invention collects the actual sound velocity corresponding to the current gear position once at a certain interval, thereby determining the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood, thereby increasing the collection frequency of the actual sound velocity, further improving the matching degree between the current working condition and the noise reduction parameters, and improving the noise reduction effect of the range hood.

[0016] Preferably, the step of obtaining the target sound speed specifically includes:

[0017] Obtaining a target temperature and a target humidity in the range hood air duct; wherein the target temperature and the target humidity are respectively the temperature and humidity collected when identifying the noise reduction parameters;

[0018] determining a target sound velocity according to the target temperature and the target humidity;

[0019] The step of collecting the actual sound speed corresponding to the current gear position specifically includes: collecting the actual temperature and actual humidity corresponding to the current gear position, and determining the actual sound speed according to the actual temperature and the actual humidity.

[0020] The noise reduction method for a range hood of the present invention accurately obtains the target sound speed and the actual sound speed by collecting the target temperature and target humidity that affect the target sound speed, and the actual temperature and actual humidity that affect the actual sound speed; takes into account the factors affecting the sound speed, improves the accuracy of the target sound speed and the actual sound speed, sends a noise compensation signal according to the current sampling rate to perform noise reduction, further improves the matching degree between the current working condition and the noise reduction parameters, and improves the noise reduction effect of the range hood.

[0021] Preferably, the noise reduction method further includes:

[0022] Obtaining a target wind speed; the target wind speed is the wind speed collected when identifying noise reduction parameters;

[0023] Collecting the actual wind speed corresponding to the current gear;

[0024] The step of determining the current sampling rate corresponding to the current gear position according to the target sound speed, the target sampling rate, and the actual sound speed is replaced by:

[0025] A current sampling rate corresponding to a current gear position is determined according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

[0026] The noise reduction method for a range hood of the present invention collects the target wind speed and the actual wind speed, determines the current sampling rate corresponding to the current gear position in combination with the target sampling rate, the target sound speed and the actual sound speed, and then uses the identified noise reduction parameters to reduce the noise of the range hood; takes into account the influence of the sound speed and wind speed on the current sampling rate, sends a noise compensation signal according to the current sampling rate to perform noise reduction, improves the matching degree between the current working condition and the noise reduction parameters, and improves the noise reduction effect of the range hood.

[0027] Preferably, the noise reduction method further includes:

[0028] When the range hood is turned off, if the time since the last noise reduction parameter identification exceeds the preset period, the current sound velocity is collected;

[0029] An actual sampling rate is determined according to the current sound speed, the target sound speed, and the target sampling rate; and noise reduction parameters are re-identified at the actual sampling rate.

[0030] The noise reduction method for the range hood of the present invention not only collects the actual wind speed and the actual sound speed in real time when the range hood is turned on, determines the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood; it also sends a noise compensation signal according to the current sampling rate to reduce the noise, thereby improving the matching degree between the current working condition and the noise reduction parameters, and improving the noise reduction effect of the range hood; it also takes into account the update of the noise reduction parameters. When the range hood is turned off, when the time for identifying the noise reduction parameters exceeds a preset period, the current sound speed is collected, and the actual sampling rate is determined according to the current sound speed, the target sound speed and the target sampling rate. The noise reduction parameters are re-identified at the actual sampling rate, and the noise reduction parameters are updated, thereby further improving the matching degree between the current working condition and the noise reduction parameters.

[0031] In a second aspect, a noise reduction system for a range hood is provided, the system comprising:

[0032] A target sampling rate acquisition module is used to obtain a target sampling rate;

[0033] A target sound speed acquisition module is used to obtain the target sound speed;

[0034] The target gear is any one of all gears, the target sampling rate is used to represent the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when identifying the noise reduction parameters;

[0035] The actual sound speed acquisition module is used to collect the actual sound speed corresponding to the current gear;

[0036] a current sampling rate determining module, configured to determine a current sampling rate corresponding to a current gear position according to the target sound speed, the target sampling rate, and the actual sound speed;

[0037] The noise reduction processing module is used to send a noise compensation signal according to the current sampling rate and use the identified noise reduction parameters to reduce the noise of the range hood.

[0038] Preferably, the actual sound speed acquisition module is specifically used to collect the actual sound speed corresponding to the current gear position once every period of time.

[0039] Preferably, the target sound speed acquisition module includes:

[0040] a target temperature acquisition unit, configured to acquire a target temperature in the air duct of the range hood;

[0041] a target humidity acquisition unit, configured to acquire a target humidity in the air duct of the range hood;

[0042] Wherein, the target temperature and the target humidity are respectively the temperature and humidity collected when identifying the noise reduction parameters;

[0043] The target sound speed acquisition module is used to determine the target sound speed according to the target temperature and the target humidity;

[0044] The actual sound speed acquisition module includes:

[0045] an actual temperature acquisition unit, configured to acquire the actual temperature corresponding to the current gear position;

[0046] The actual humidity acquisition unit is used to collect the actual humidity corresponding to the current gear position; and determine the actual sound speed according to the actual temperature and the actual humidity.

[0047] Preferably, the noise reduction system further comprises:

[0048] A target wind speed acquisition module is used to acquire a target wind speed; the target wind speed is the wind speed collected when identifying noise reduction parameters;

[0049] An actual wind speed acquisition module, configured to acquire the actual wind speed corresponding to the current gear position;

[0050] The current sampling rate determination module is specifically configured to determine a current sampling rate corresponding to a current gear position according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

[0051] Preferably, the noise reduction system further comprises:

[0052] The current sound velocity acquisition module is used to collect the current sound velocity when the range hood is in the off state and if the time since the last noise reduction parameter identification exceeds the preset period;

[0053] The parameter identification module is used to determine the actual sampling rate according to the current sound speed, the target sound speed and the target sampling rate; and re-identify the noise reduction parameters at the actual sampling rate.

[0054] The noise reduction system of the range hood of the present invention collects the actual sound velocity corresponding to the current gear of the range hood, and determines the current sampling rate corresponding to the current gear according to the target sound velocity, the target sampling rate and the actual sound velocity, and then adjusts the frequency of sending the noise compensation signal according to the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood; collects the actual sound velocity of the range hood, and determines the current sampling rate in combination with the target sampling rate and the target sound velocity, taking into account the influence of the sound velocity and wind speed on the current sampling rate, and sends the noise compensation signal according to the current sampling rate to reduce the noise, without increasing the workload of noise reduction parameter identification, thereby improving the matching degree between the current working condition and the noise reduction parameters, improving the noise reduction effect of the range hood, improving the user experience, and ensuring the physical and mental health of the user.

[0055] In a third aspect, a range hood is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned noise reduction methods when executing the computer program.

[0056] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, any of the above-mentioned noise reduction methods is implemented.

[0057] The positive progress effect of the present invention is:

[0058] By collecting the actual sound speed and the target sound speed; combining the target sampling rate to determine the current sampling rate corresponding to the current gear, and then using the identified noise reduction parameters to reduce the noise of the range hood; considering the impact of the sound speed on the current sampling rate, and then adjusting the sampling rate, without increasing the workload of noise reduction parameter identification, the matching degree between the current working condition and the noise reduction parameters is improved, thereby enhancing the user experience and ensuring the user's physical and mental health. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a flow chart of the range hood noise reduction method provided in Example 1 of the present invention;

[0060] Figure 2 This is a flow chart of the range hood noise reduction method provided in Example 1 of the present invention;

[0061] Figure 3 A method flow chart corresponding to step 101 and step 102 provided in Example 1 of the present invention;

[0062] Figure 4 A flow chart of a range hood noise reduction method provided in Example 2 of the present invention;

[0063] Figure 5 A schematic diagram of a module of a range hood noise reduction system provided in Example 3 of the present invention;

[0064] Figure 6 This is a structural schematic diagram of the range hood provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0065] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0066] Example 1

[0067] Figure 1 This is a flow chart of a range hood noise reduction method provided in Example 1 of the present invention; the method comprises the following steps:

[0068] Step 101: Obtain a target sampling rate and a target sound speed.

[0069] The target gear is any one of all gears, the target sampling rate is used to characterize the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when identifying the noise reduction parameters.

[0070] Each gear may correspond to a different noise reduction parameter or the same noise reduction parameter. When each gear corresponds to a different noise reduction parameter, the target sound speed is the sound speed collected when determining the noise reduction parameter corresponding to the target gear.

[0071] The target sampling rate represents the frequency of the noise compensation signal transmitted at the target gear position. The noise compensation signal is used to generate a signal with a phase opposite to the noise to cancel it out, thereby achieving range hood noise reduction. The noise emitted by the range hood during operation has a certain transmission speed, also known as the speed of sound. The target sound speed is the sound speed sampled by the range hood at the target gear position when identifying noise reduction parameters. Range hoods have different gear positions, each corresponding to different or identical noise reduction parameters. Before the initial noise reduction operation, the noise reduction parameters must be identified to obtain the identified noise reduction parameters.

[0072] The above-mentioned noise reduction parameters may be referred to as a sound field model or a noise reduction model. In a specific example, the above-mentioned noise reduction parameters include secondary path filter coefficients and noise reduction filter coefficients.

[0073] Step 102: Collect the actual sound speed corresponding to the current gear position.

[0074] The wind speed gear of the range hood during actual operation, i.e., the current gear, is used. Since changes in temperature or humidity in the public flue may cause changes in the speed of sound, resulting in a discrepancy between the actual speed of sound and the target speed of sound, the actual speed of sound at the current gear needs to be collected in step 102.

[0075] Step 103: Determine a current sampling rate corresponding to the current gear position according to the target sound speed, the target sampling rate, and the actual sound speed.

[0076] The current sampling rate is determined based on the target sampling rate and the target sound velocity and actual sound velocity of the range hood.

[0077] Step 104: Send a noise compensation signal according to the current sampling rate, and use the identified noise reduction parameters to reduce the noise of the range hood.

[0078] During the actual operation of the range hood, the frequency of sending the noise compensation signal is adjusted according to the current sampling rate, and the identified noise reduction parameters are selected for noise reduction. The identified noise reduction parameters can correspond to the current gear or be unified, thereby improving the matching degree between the current working conditions and the noise reduction parameters.

[0079] The noise reduction method for the range hood of this embodiment collects the actual sound velocity corresponding to the current gear of the range hood, and determines the current sampling rate corresponding to the current gear based on the target sound velocity, the target sampling rate and the actual sound velocity, and then adjusts the frequency of sending the noise compensation signal based on the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood; the actual sound velocity of the range hood is collected, and the current sampling rate is determined in combination with the target sampling rate and the target sound velocity. Without increasing the workload of noise reduction parameter identification, the matching degree between the current working condition and the noise reduction parameters is improved, the noise reduction effect of the range hood is improved, the user experience is enhanced, and the physical and mental health of the user is protected.

[0080] In this embodiment, the step of collecting the actual sound speed corresponding to the current gear position in step 102 specifically includes:

[0081] Step 1021: collect the actual sound speed corresponding to the current gear position at regular intervals.

[0082] The actual sound speed in this embodiment has a certain sampling frequency, and the actual sound speed corresponding to the current gear is collected once every period of time, which can ensure the accuracy of the actual sound speed data.

[0083] The noise reduction method of the range hood in this embodiment improves the acquisition frequency of the actual sound velocity, improves the accuracy of the actual sound velocity corresponding to the current gear, and uses the identified noise reduction parameters to reduce the noise of the range hood, thereby improving the matching degree between the current working conditions and the noise reduction parameters, and improving the noise reduction effect of the range hood.

[0084] Figure 2 This is a method flow chart corresponding to step 101 and step 102 provided in Example 1 of the present invention. In step 101, the step of obtaining the target sound speed specifically includes:

[0085] Step 1011: Acquire the target temperature and target humidity in the range hood air duct; wherein the target temperature and target humidity are respectively the temperature and humidity collected when identifying the noise reduction parameters.

[0086] When the noise reduction parameters are identified, the temperature and humidity at the time of identification are obtained, which are the target temperature and target humidity.

[0087] Step 1012: Determine the target sound speed according to the target temperature and target humidity.

[0088] In step 102, the step of collecting the actual sound speed corresponding to the current gear position specifically includes:

[0089] Step 1022: Collect the actual temperature and humidity corresponding to the current gear position, and determine the actual sound speed based on the actual temperature and humidity.

[0090] The actual sound speed is determined according to the actual temperature and actual humidity corresponding to the range hood operating at the current gear.

[0091] Figure 3 This is a flow chart of a range hood noise reduction method provided in Example 1 of the present invention; the method comprises the following steps:

[0092] Step 201: Obtain target wind speed; the target wind speed is the wind speed collected when identifying noise reduction parameters.

[0093] The target wind speed is the wind speed of the range hood at the target gear when performing noise reduction parameter identification.

[0094] Step 202: Collect the actual wind speed corresponding to the current gear.

[0095] The wind speed level of the range hood during actual operation, i.e., the current level. Due to the pressure fluctuations in the public flue, the actual wind speed inside the range hood may not match the previous measured value, i.e., the actual wind speed does not match the target wind speed. Therefore, in step 202, the actual wind speed at the current level needs to be collected.

[0096] Step 203: Determine a current sampling rate corresponding to the current gear position according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

[0097] The current sampling rate is determined based on the target sampling rate, the target wind speed, the target sound speed, the actual wind speed, and the actual sound speed of the range hood.

[0098] The calculation of the actual speed of sound needs to take into account conditions such as temperature and humidity, as well as the influence of the Doppler effect on the speed of sound. It can be calculated by measuring the actual temperature, actual humidity, and actual wind speed in the air duct. Alternatively, one or more sets of speakers and microphones can be used for measurement. The speakers send out a pulse signal, and the delay between the microphone capturing the pulse signal and the speaker sending the pulse signal is measured. The actual speed of sound is then measured based on the distance between the corresponding speaker-microphone pair and the internal delay time.

[0099] The noise reduction method for the range hood of this embodiment collects the target wind speed and the actual wind speed, and determines the current sampling rate corresponding to the current gear in combination with the target sampling rate, the target sound speed and the actual sound speed, and then uses the identified noise reduction parameters to reduce the noise of the range hood; considering the influence of the sound speed and wind speed on the current sampling rate, the sampling rate is adjusted to improve the matching degree between the current working condition and the noise reduction parameters, thereby improving the noise reduction effect of the range hood.

[0100] The working principle of the noise reduction method for the range hood of the present invention will be described in detail below based on different application scenarios and in combination with Example 3.

[0101] In scenario 1, during the actual noise reduction process, assuming that the actual wind speed is consistent with the target wind speed during identification, the method for calculating the current sampling rate is as follows:

[0102] (1) Before noise reduction, noise reduction parameter identification is performed to obtain identified noise reduction parameters;

[0103] First, the target wind speed at the target gear is obtained as W1, the target sampling rate is obtained as S1, the target temperature t1 and the target humidity h1 are obtained, and the target sound speed is determined as V1;

[0104] At this time, the target sound speed V1=333.1+0.606*t1+1.26*h1;

[0105] Since the main path of noise propagation is from the impeller outward, which is opposite to the suction direction of the range hood, the equivalent sound speed can be considered to be V1-W1.

[0106] (2) During the noise reduction process, the actual temperature t2 and the actual humidity h2 are obtained to determine the actual sound speed V2;

[0107] At this time, the target sound speed V2=333.1+0.606*t2+1.26*h2;

[0108] At this time, the equivalent sound speed is V2-W1;

[0109] Based on this, calculate the sound speed ratio R1 of the equivalent sound speed at this time and the equivalent sound speed during identification;

[0110] R1=(V2-W1) / (V1-W1);

[0111] According to the sound speed ratio R1, the target sampling rate S1 is adjusted to obtain the current sampling rate S2 corresponding to the current gear position. The current sampling rate S2 = S1*R1 = S1*(V2-W1) / (V1-W1).

[0112] The noise compensation signal is sent according to the current sampling rate S2, and the noise is eliminated in combination with the identified noise reduction parameters, thereby improving the matching degree between the current working condition and the noise reduction parameters and improving the noise reduction effect.

[0113] In a specific example, the noise reduction parameters are identified when the fan of the range hood stops rotating. At this time, since the fan of the range hood stops rotating, it can be considered that the target gear of the range hood is gear 0, and the target wind speed corresponding to the target gear is 0. At this time, the equivalent sound speed is V1; in the noise reduction process, the equivalent sound speed at the current gear is V2; at this time, the sound speed ratio is R2=V2 / V1; according to the sound speed ratio R2, the target sampling rate S1 is adjusted to obtain the current sampling rate S3 corresponding to the current gear, and the current sampling rate S3=S1*R2=S1*V2 / V1; the noise compensation signal is sent according to the current sampling rate S3.

[0114] The identification of noise reduction parameters can be performed at any wind speed level of the range hood, with low wind speed level and off wind speed level being preferred because the background noise is smaller and the identified noise reduction parameters are more accurate.

[0115] In scenario 2, during the actual noise reduction process, assuming that the actual wind speed is inconsistent with the target wind speed during identification, the method for calculating the current sampling rate is as follows:

[0116] (1) Before noise reduction, noise reduction parameter identification is performed to obtain identified noise reduction parameters;

[0117] First, the target wind speed at the target gear is obtained as W1, the target sampling rate is obtained as S1, the target temperature t1 and the target humidity h1 are obtained, and the target sound speed is determined as V1;

[0118] At this time, the target sound speed V1=333.1+0.606*t1+1.26*h1;

[0119] Since the main path of noise propagation is from the impeller outward, which is opposite to the suction direction of the range hood, the equivalent sound speed can be considered to be V1-W1.

[0120] (2) During the noise reduction process, the actual wind speed W2 at the current gear is obtained, the actual temperature t2 and the actual humidity h2 are obtained, and the actual sound speed V2 is determined;

[0121] At this time, the actual sound speed V2=333.1+0.606*t2+1.26*h2;

[0122] At this time, the equivalent sound speed is V2-W2;

[0123] Based on this, calculate the sound velocity ratio R3 of the equivalent sound velocity at this time and the equivalent sound velocity during identification;

[0124] R3 = (V2 - W2) / (V1 - W1);

[0125] According to the sound speed ratio R3, the target sampling rate S1 is adjusted to obtain the current sampling rate S4 corresponding to the current gear position. The current sampling rate S4 = S1*R3 = S1*(V2-W2) / (V1-W1).

[0126] According to the current sampling rate S4, a noise compensation signal is sent, and combined with the identified noise reduction parameters, the noise is offset by the sound with the opposite phase to the noise, thereby improving the matching degree between the current working condition and the noise reduction parameters and improving the noise reduction effect.

[0127] In a specific example, the noise reduction parameters are identified when the fan of the range hood stops rotating. At this time, since the fan of the range hood stops rotating, it can be considered that the target gear of the range hood is gear 0, and the target wind speed corresponding to the target gear is 0. At this time, the equivalent sound speed is V1; in the noise reduction process, the equivalent sound speed at the current gear is V2-W2; at this time, the sound speed ratio is R4=(V2-W2) / V1; according to the sound speed ratio R4, the target sampling rate S1 is adjusted to obtain the current sampling rate S5 corresponding to the current gear, the current sampling rate S5=S1*R4=S1*(V2-W2) / V1; the noise compensation signal is sent according to the current sampling rate S5.

[0128] The noise reduction method of the range hood of this embodiment obtains the target sound speed and the actual sound speed by obtaining the temperature and humidity, comprehensively considers the factors affecting the sound speed, and calculates the current sampling rate in combination with the target wind speed and the actual wind speed, thereby further improving the matching degree between the current working conditions and the noise reduction parameters, and improving the noise reduction effect of the range hood.

[0129] Example 2

[0130] The noise reduction method of the range hood of this embodiment is a further improvement of the embodiment 1. Specifically:

[0131] Figure 4 This is a flow chart of a range hood noise reduction method provided in Example 2 of the present invention, the method comprising the following steps:

[0132] Step 301: When the range hood is in the off state, if the time since the last noise reduction parameter identification exceeds a preset period, the current sound velocity is collected.

[0133] This embodiment takes into account the interval for identifying noise reduction parameters. After the range hood has been used for a period of time, the previously identified noise reduction parameters may become inaccurate, resulting in a decrease in the matching degree of the noise reduction parameters selected for actual operating conditions, necessitating re-identification of the noise reduction parameters. When the range hood is turned off, a determination is made as to whether the time for identifying noise reduction parameters has exceeded a preset interval. If so, the current sound velocity is collected.

[0134] Step 302: Determine the actual sampling rate according to the current sound speed, the target sound speed, and the target sampling rate; and re-identify the noise reduction parameters at the actual sampling rate.

[0135] For different gears of the range hood, the target sound speed corresponding to different target gears is obtained. Combined with the current sound speed, the target sampling rate is updated to obtain the actual sampling rate, and the noise reduction parameters are re-identified at the actual sampling rate.

[0136] The principle of re-identifying noise reduction parameters of the present invention is described in detail below with reference to Example 2:

[0137] (1) Get the current sound speed V3;

[0138] (2) Calculate the sound speed ratio r' based on the current sound speed V3, the target sound speed V1, and the target wind speed W1, where r' = V3 / (V1-W1);

[0139] (3) According to the sound velocity ratio r' and the target sampling rate S1, the target sampling rate is updated to obtain the actual sampling rate S1', the actual sampling rate S1'=S1*r'=S1*V3 / (V1-W1);

[0140] (4) Re-identify the noise reduction parameters at the actual sampling rate S1'.

[0141] If the noise reduction parameter identification is performed when the wind speed gear is turned off, the target wind speed is 0, and the sound speed ratio at this time is r', r' = V3 / V1; update the target sampling rate according to r to obtain the actual sampling rate S1' = S1*r' = S1*V3 / V1; re-identify the noise reduction parameters at the actual sampling rate S1'.

[0142] Example 3

[0143] This embodiment provides a noise reduction system for a range hood. Figure 5 Schematic diagram of a module of a range hood noise reduction system provided in Example 3 of the present invention; the noise reduction system includes:

[0144] Target sampling rate acquisition module 1, used to obtain the target sampling rate;

[0145] Target sound speed acquisition module 2, used to obtain the target sound speed;

[0146] The target gear is any one of all gears, the target sampling rate is used to represent the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when determining the identification noise reduction parameters;

[0147] Actual sound speed acquisition module 3, used to collect the actual sound speed corresponding to the current gear;

[0148] A current sampling rate determination module 4 is configured to determine a current sampling rate corresponding to the current gear position based on the target sound speed, the target sampling rate, and the actual sound speed;

[0149] The noise reduction processing module 5 is used to send a noise compensation signal according to the current sampling rate and use the identified noise reduction parameters to reduce the noise of the range hood.

[0150] In an optional implementation manner, the actual sound speed acquisition module 3 is specifically configured to collect the actual sound speed corresponding to the current gear position once every period of time.

[0151] In an optional embodiment, the target sound speed acquisition module 2 includes:

[0152] A target temperature acquisition unit 6 is used to acquire a target temperature in the air duct of the range hood;

[0153] A target humidity acquisition unit 7 is used to acquire the target humidity in the air duct of the range hood;

[0154] Among them, the target temperature and target humidity are the temperature and humidity collected when identifying the noise reduction parameters;

[0155] The target sound speed acquisition module 2 is used to determine the target sound speed according to the target temperature and target humidity;

[0156] The actual sound speed acquisition module 3 includes:

[0157] The actual temperature acquisition unit 8 is used to collect the actual temperature corresponding to the current gear position;

[0158] The actual humidity acquisition unit 9 is used to collect the actual humidity corresponding to the current gear position; and determine the actual sound speed according to the actual temperature and actual humidity.

[0159] In an optional embodiment, the noise reduction system further includes:

[0160] The target wind speed acquisition module 10 is used to acquire the target wind speed; the target wind speed is the wind speed collected when identifying the noise reduction parameters;

[0161] The actual wind speed acquisition module 11 is used to collect the actual wind speed corresponding to the current gear;

[0162] The current sampling rate determination module 4 is specifically configured to determine the current sampling rate corresponding to the current gear position according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

[0163] In an optional embodiment, the noise reduction system further includes:

[0164] The current sound velocity acquisition module 12 is used to acquire the current sound velocity when the range hood is in the off state and if the time since the last noise reduction parameter identification exceeds a preset period;

[0165] The parameter identification module 13 determines the actual sampling rate according to the current sound speed, the target sound speed and the target sampling rate, and re-identifies the noise reduction parameters at the actual sampling rate.

[0166] The noise reduction system of the range hood of the present invention collects the actual sound velocity corresponding to the current gear of the range hood, and determines the current sampling rate corresponding to the current gear according to the target sound velocity, the target sampling rate and the actual sound velocity, and then adjusts the frequency of sending the noise compensation signal according to the current sampling rate, and uses the identified noise reduction parameters to reduce the noise of the range hood; the actual sound velocity of the range hood is collected, and the current sampling rate is determined in combination with the target sampling rate and the target sound velocity, and the influence of the sound velocity on the current sampling rate is taken into account, and the noise compensation signal is sent according to the current sampling rate to reduce the noise, without increasing the workload of noise reduction parameter identification, thereby improving the matching degree between the current working condition and the noise reduction parameters, improving the noise reduction effect of the range hood, improving the user experience, and ensuring the physical and mental health of the user.

[0167] Example 4

[0168] This embodiment provides a range hood, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the noise reduction method in Embodiments 1-2 is implemented.

[0169] The range hood also includes a temperature and humidity sensor, a wind speed sensor, a microphone, and a speaker. The wind speed sensor collects the current wind speed or target wind speed, while the temperature and humidity sensor collects the current temperature and humidity or the actual temperature and humidity, thereby calculating the target sound speed or the actual sound speed. The microphones can be multiple, each used to collect both the range hood's noise and ambient noise. The speakers can be multiple, each used to generate a signal with a phase opposite to the noise, i.e., a noise compensation signal, to cancel out the noise.

[0170] Figure 6 This is a schematic diagram of the structure of the range hood provided by Example 4 of the present invention. Figure 6 The range hood shown is merely an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0171] like Figure 6 As shown, the components of the range hood may include but are not limited to: the above-mentioned at least one processor 61, the above-mentioned at least one memory 62, a bus 63 connecting different system components (including the memory 62 and the processor 61), a temperature and humidity sensor 66, a wind speed sensor 67, at least one microphone 68, and at least one speaker 69.

[0172] The bus 63 includes a data bus, an address bus, and a control bus.

[0173] The memory 62 may include a volatile memory, such as a random access memory (RAM) 621 and / or a cache memory 622 , and may further include a read-only memory (ROM) 623 .

[0174] The memory 62 may also include a program tool 625 (or utility) having a set (at least one) of program modules 624, such program modules 624 including but not limited to: an operating system, one or more application programs, other program modules and program data, each of which or some combination may include an implementation of a network environment.

[0175] The processor 61 executes various functional applications and data processing by running computer programs stored in the memory 62, such as the methods provided in the above-mentioned embodiments 1-2.

[0176] The range hood can also communicate with one or more external devices. This communication can occur via an input / output (I / O) interface 64. Furthermore, the range hood can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 65. As shown, the network adapter 65 communicates with other modules of the range hood via a bus 63. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the range hood, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0177] It should be noted that while the above detailed description refers to several units / modules or sub-units / modules of the range hood, this division is merely exemplary and not mandatory. In practice, depending on the embodiments of the present invention, the features and functions of two or more units / modules described above may be embodied in a single unit / module. Conversely, the features and functions of a single unit / module described above may be further divided and embodied by multiple units / modules.

[0178] Example 5

[0179] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the noise reduction method in the above-mentioned embodiments 1-2 is implemented.

[0180] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0181] In a possible implementation manner, the present invention may also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps in the noise reduction method in the above embodiments 1-2.

[0182] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0183] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A method for reducing noise of a range hood, characterized in that: The noise reduction method comprises the following steps: Obtain a target sampling rate and a target sound speed; wherein the target gear is any one of all gears, the target sampling rate is used to represent the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when identifying the noise reduction parameters; Collect the actual sound speed corresponding to the current gear; Determining a current sampling rate corresponding to a current gear position according to the target sound speed, the target sampling rate, and the actual sound speed; Sending a noise compensation signal according to the current sampling rate, and performing noise reduction on the range hood using the identified noise reduction parameters; The steps of obtaining the target sound speed specifically include: Obtaining a target temperature and a target humidity in the range hood air duct; wherein the target temperature and the target humidity are respectively the temperature and humidity collected when identifying the noise reduction parameters; determining a target sound velocity according to the target temperature and the target humidity; The step of collecting the actual sound speed corresponding to the current gear position specifically includes: collecting the actual temperature and actual humidity corresponding to the current gear position, and determining the actual sound speed according to the actual temperature and the actual humidity.

2. The noise reduction method according to claim 1, wherein: The step of collecting the actual sound speed corresponding to the current gear position specifically includes: collecting the actual sound speed corresponding to the current gear position once every period of time.

3. The noise reduction method according to claim 1, wherein: The noise reduction method further includes: Obtaining a target wind speed; the target wind speed is the wind speed collected when identifying noise reduction parameters; Collecting the actual wind speed corresponding to the current gear; The step of determining the current sampling rate corresponding to the current gear position according to the target sound speed, the target sampling rate, and the actual sound speed is replaced by: A current sampling rate corresponding to a current gear position is determined according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

4. The noise reduction method according to any one of claims 1 to 3, wherein: The noise reduction method further includes: When the range hood is turned off, if the time since the last noise reduction parameter identification exceeds the preset period, the current sound velocity is collected; Determining an actual sampling rate according to the current sound speed, the target sound speed, and the target sampling rate; The noise reduction parameters are re-identified at the actual sampling rate.

5. A noise reduction system for a range hood, characterized in that: The system comprises: A target sampling rate acquisition module is used to obtain a target sampling rate; A target sound speed acquisition module is used to obtain the target sound speed; The target gear is any one of all gears, the target sampling rate is used to represent the frequency of sending the noise compensation signal at the target gear, and the target sound speed is the sound speed collected when identifying the noise reduction parameters; The actual sound speed acquisition module is used to collect the actual sound speed corresponding to the current gear; a current sampling rate determining module, configured to determine a current sampling rate corresponding to a current gear position according to the target sound speed, the target sampling rate, and the actual sound speed; a noise reduction processing module, configured to send a noise compensation signal according to the current sampling rate and perform noise reduction on the range hood using the identified noise reduction parameters; The target sound speed acquisition module includes: a target temperature acquisition unit, configured to acquire a target temperature in the air duct of the range hood; a target humidity acquisition unit, configured to acquire a target humidity in the air duct of the range hood; Wherein, the target temperature and the target humidity are respectively the temperature and humidity collected when identifying the noise reduction parameters; The target sound speed acquisition module is used to determine the target sound speed according to the target temperature and the target humidity; The actual sound speed acquisition module includes: an actual temperature acquisition unit, configured to acquire the actual temperature corresponding to the current gear position; The actual humidity acquisition unit is used to collect the actual humidity corresponding to the current gear position; and determine the actual sound speed according to the actual temperature and the actual humidity.

6. The noise reduction system according to claim 5, wherein: The actual sound speed acquisition module is specifically used to collect the actual sound speed corresponding to the current gear position once every period of time.

7. The noise reduction system according to claim 5, wherein: The noise reduction system further comprises: A target wind speed acquisition module is used to acquire a target wind speed; the target wind speed is the wind speed collected when identifying noise reduction parameters; An actual wind speed acquisition module, configured to acquire the actual wind speed corresponding to the current gear position; The current sampling rate determination module is specifically configured to determine a current sampling rate corresponding to a current gear position according to the target wind speed, the target sound speed, the target sampling rate, the actual sound speed, and the actual wind speed.

8. The noise reduction system according to any one of claims 5 to 7, wherein: The noise reduction system further comprises: The current sound velocity acquisition module is used to collect the current sound velocity when the range hood is in the off state and if the time since the last noise reduction parameter identification exceeds the preset period; The parameter identification module is used to determine the actual sampling rate according to the current sound speed, the target sound speed and the target sampling rate; and re-identify the noise reduction parameters at the actual sampling rate.

9. A range hood comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the noise reduction method according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the noise reduction method according to any one of claims 1 to 4 is implemented.

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