CN111076245B - Intelligent noise reduction method for range hood - Google Patents
Intelligent noise reduction method for range hood Download PDFInfo
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- CN111076245B CN111076245B CN201811218264.9A CN201811218264A CN111076245B CN 111076245 B CN111076245 B CN 111076245B CN 201811218264 A CN201811218264 A CN 201811218264A CN 111076245 B CN111076245 B CN 111076245B
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- range hood
- pressure value
- sound pressure
- user
- sound
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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
- F24C15/2021—Arrangement or mounting of control or safety systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
Abstract
The invention relates to an intelligent noise reduction method for a range hood, which is characterized by comprising the following steps: the method comprises the steps of 1, collecting real-time sound signals in the running process of the range hood, and entering a step 2 if the sound signals contain people; step 2, obtaining a user sound pressure value and a background noise sound pressure value; step 3, if the sound pressure value of the background noise subtracted from the sound pressure value of the user is less than or equal to a preset threshold value, entering step 4; step 4, detecting resistance in a flue communicated with an exhaust port of the range hood and firepower of the stove, and entering step 5 if the resistance in the flue is smaller than or equal to a preset resistance threshold value and the firepower of the stove is smaller than or equal to a preset firepower threshold value; and 5, reducing the rotating speed of the fan of the range hood, delaying the preset time and returning to the step 1. Compared with the prior art, the invention can meet the requirement of a user on the oil fume suction performance of the range hood under the condition of improving the conversation quality of the user.
Description
Technical Field
The invention relates to an intelligent noise reduction method for a range hood.
Background
The existing range hood is generally high in noise, and the national standard provides that the A-level sound power level is 72dB (A). But under this noise level, the conversation quality of the user in the kitchen is still affected. Many users reflect an inability to communicate with others pleasantly while cooking in the kitchen due to the fact that kitchen noise is loud and affects the quality of the conversation between the family members. With the increase of the living quality requirements of users, the requirements on kitchen noise are more and more strict.
The existing range hood adaptive to user scenes has the following defects in noise reduction treatment:
1. when the range hood is used, due to high noise, a user can have a conversation in a kitchen, and the speaking content of the other party cannot be heard clearly.
2. The rotating speed of the range hood is adjusted by detecting the resistance of the flue independently, but the firepower of the cooker is not considered; when the resistance of the flue is small, if the firepower is large, the actions of stir-frying and the like are performed by the user, and the rotating speed is reduced at the moment, so that the use condition of the user is not met;
3. the rotating speed of the range hood is adjusted by detecting the firepower independently, but the flue resistance is not considered; when the smoke-discharging device is used in a centralized high-rise building, smoke is difficult to discharge, so that a large rotating speed is still needed, and static pressure cannot be reduced;
in conclusion, the noise development of the current range hood does not guarantee the effect of meeting the conversation quality of the user.
Disclosure of Invention
The invention aims to solve the technical problem of providing an intelligent noise reduction method for a range hood aiming at the prior art, which can meet the requirements of a user on the oil smoke absorption performance of the range hood under the condition of improving the conversation quality of the user.
The technical scheme adopted by the invention for solving the technical problems is as follows: an intelligent noise reduction method for a range hood is characterized by comprising the following steps:
step 1, collecting real-time sound signals in the running process of the range hood, judging whether the collected real-time sound signals contain the sound signals of people, entering step 2, and if the collected real-time sound signals do not contain the sound signals of people, normally running the range hood according to the current state;
step 2, obtaining a sound pressure value of a user sound signal in the real-time sound signal and a background noise sound pressure value including the sound of a fan of the range hood;
step 3, subtracting the background noise sound pressure value from the sound pressure value of the user sound signal, if the background noise sound pressure value subtracted from the sound pressure value of the user sound signal is smaller than or equal to a preset threshold value, indicating that the noise of the range hood affects the user conversation, and entering step 4; if the sound pressure value of the background noise subtracted from the sound pressure value of the user sound signal is larger than a preset threshold value, it is indicated that the noise of the range hood does not influence the user conversation, and the range hood normally operates according to the current state;
step 4, detecting resistance in a flue communicated with an exhaust port of the range hood and firepower of the stove, and entering step 5 if the resistance in the flue is smaller than or equal to a preset resistance threshold and the firepower of the stove is smaller than or equal to a preset firepower threshold; if the resistance in the flue is larger than a preset resistance threshold value or the firepower of the cooker is larger than a preset firepower threshold value, the range hood normally operates according to the current state;
and 5, reducing the rotating speed of the fan of the range hood, delaying the preset time, returning to the step 1 until the sound pressure value of the user sound signal minus the background noise sound pressure value is greater than a preset threshold value, stopping adjusting the rotating speed of the range hood, and then returning to the step 1 again.
As an improvement, in the step 5, firstly, the rotation speed of the fan is reduced within the range of the current operation gear of the range hood, if the current operation gear is operated according to the lowest rotation speed of the fan within the range of the current operation gear, the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is still less than or equal to the preset threshold value, the current operation gear of the range hood is reduced until the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is greater than the preset threshold value, and then, the rotation speed of the range hood is stopped being adjusted.
Compared with the prior art, the invention has the advantages that: the method comprises the steps of firstly detecting the sound of a user, then detecting the resistance and the firepower of a flue, and further controlling the operating speed of the range hood to adjust the noise of a kitchen, wherein the three-level secondary detection can improve the user experience, is closer to the actual use scene of the user, and can meet the requirements of reducing the noise and simultaneously not influencing the actually used air volume and air pressure; the requirements of the user on the oil fume suction performance of the range hood can be met under the condition of improving the conversation quality of the user.
Drawings
Fig. 1 is a flow chart of an intelligent noise reduction method of a range hood in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The intelligent noise reduction method for the range hood as shown in fig. 1 comprises the following steps:
step 1, collecting real-time sound signals in the running process of the range hood, judging whether the collected real-time sound signals contain the sound signals of people, entering step 2, and if the collected real-time sound signals do not contain the sound signals of people, normally running the range hood according to the current state; because the voice frequency of the speaking of a person is different from the voice frequency of a fan when the range hood runs, the sound pressure value of the voice of the user and the sound pressure value of background noise can be respectively extracted through filtering processing and Fourier transform, wherein in the filtering processing process, the background noise signal in the range of 80-1200 hz is filtered, and if the detected sound pressure value is more than 60db, the voice of the person can be basically judged; the process of sound processing is the conventional technology;
step 2, obtaining a sound pressure value of a user sound signal in the real-time sound signal and a background noise sound pressure value including the sound of a fan of the range hood;
step 3, subtracting the background noise sound pressure value from the sound pressure value of the user sound signal, if the background noise sound pressure value subtracted from the sound pressure value of the user sound signal is smaller than or equal to a preset threshold value, indicating that the noise of the range hood affects the user conversation, and entering step 4; here the preset threshold is 8 db; if the sound pressure value of the background noise subtracted from the sound pressure value of the user sound signal is larger than a preset threshold value, it is indicated that the noise of the range hood does not influence the user conversation, and the range hood normally operates according to the current state;
step 4, detecting resistance in a flue communicated with an exhaust port of the range hood and firepower of the stove, and entering step 5 if the resistance in the flue is smaller than or equal to a preset resistance threshold and the firepower of the stove is smaller than or equal to a preset firepower threshold; if the resistance in the flue is larger than a preset resistance threshold value or the firepower of the cooker is larger than a preset firepower threshold value, the range hood normally operates according to the current state;
and 5, reducing the rotating speed of the fan of the range hood, delaying the preset time, returning to the step 1 until the sound pressure value of the user sound signal minus the background noise sound pressure value is greater than a preset threshold value, stopping adjusting the rotating speed of the range hood, and then returning to the step 1 again.
In step 5, firstly, the rotating speed of the fan is reduced in the range of the current operating gear of the range hood, if the rotating speed of the fan is the lowest in the range of the current operating gear, the current operating gear of the range hood is reduced until the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is still less than or equal to a preset threshold value, if the current operating gear is 4 gears, the current operating gear is reduced to 3 gears until the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is greater than the preset threshold value, and then the rotating.
Claims (2)
1. An intelligent noise reduction method for a range hood is characterized by comprising the following steps:
step 1, collecting real-time sound signals in the running process of the range hood, judging whether the collected real-time sound signals contain the sound signals of people, entering step 2, and if the collected real-time sound signals do not contain the sound signals of people, normally running the range hood according to the current state;
step 2, obtaining a sound pressure value of a user sound signal in the real-time sound signal and a background noise sound pressure value including the sound of a fan of the range hood;
step 3, subtracting the background noise sound pressure value from the sound pressure value of the user sound signal, if the background noise sound pressure value subtracted from the sound pressure value of the user sound signal is smaller than or equal to a preset threshold value, indicating that the noise of the range hood affects the user conversation, and entering step 4; if the sound pressure value of the background noise subtracted from the sound pressure value of the user sound signal is larger than a preset threshold value, it is indicated that the noise of the range hood does not influence the user conversation, and the range hood normally operates according to the current state;
step 4, detecting resistance in a flue communicated with an exhaust port of the range hood and firepower of the stove, and entering step 5 if the resistance in the flue is smaller than or equal to a preset resistance threshold and the firepower of the stove is smaller than or equal to a preset firepower threshold; if the resistance in the flue is larger than a preset resistance threshold value or the firepower of the cooker is larger than a preset firepower threshold value, the range hood normally operates according to the current state;
and 5, reducing the rotating speed of the fan of the range hood, delaying the preset time, returning to the step 1 until the sound pressure value of the user sound signal minus the background noise sound pressure value is greater than a preset threshold value, stopping adjusting the rotating speed of the range hood, and then returning to the step 1 again.
2. The intelligent noise reduction method for the range hood according to claim 1, wherein the method comprises the following steps: in the step 5, firstly, the rotating speed of the fan is reduced in the current operating range of the range hood, if the current operating range of the range hood runs at the lowest rotating speed of the fan in the current operating range, the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is still less than or equal to the preset threshold value, the current operating range of the range hood is reduced until the value obtained by subtracting the background noise sound pressure value from the sound pressure value of the user sound signal is greater than the preset threshold value, and then the rotating speed of the range hood is stopped being adjusted.
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| CN201811218264.9A CN111076245B (en) | 2018-10-19 | 2018-10-19 | Intelligent noise reduction method for range hood |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112413689A (en) * | 2020-12-08 | 2021-02-26 | 珠海格力电器股份有限公司 | Control method and device of refrigeration integrated cooker, processor and refrigeration integrated cooker system |
| EP4043799B1 (en) * | 2021-02-16 | 2024-04-10 | Electrolux Appliances Aktiebolag | Extractor hood for a hob and method for operating an extractor hood |
| CN113074433B (en) * | 2021-04-29 | 2022-03-18 | 珠海格力电器股份有限公司 | Control method, device and equipment of air conditioner and storage medium |
| CN113534672A (en) * | 2021-06-28 | 2021-10-22 | 青岛海尔空调器有限总公司 | Method and device for controlling intelligent equipment and intelligent equipment |
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| CN105091208A (en) * | 2014-05-23 | 2015-11-25 | 美的集团股份有限公司 | Method and system for controlling air speed of air conditioner |
| CN105276751A (en) * | 2014-06-26 | 2016-01-27 | 美的集团股份有限公司 | Voice playing method and system |
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