阅读说明：本技术 送风装置及其控制方法 (Air supply device and control method thereof ) 是由 李熵 于 2021-09-26 设计创作，主要内容包括：本发明公开一种送风装置及其控制方法,其中,所述控制方法包括：启动送风装置的风机,采集所述送风装置在基准转速下发出的音频信号,提取所述音频信号的第一频域特征；将所述第一频域特征与对应于所述管径的预存频域特征进行匹配；根据当前管径下的预设转速对所述风机的转速进行调整,所述当前管径是与所述第一频域特征相匹配的预存频域特征所对应的管径。本发明提供的技术方案旨在解决现有由于风机转速与实际安装的进风管的管径不匹配导致的噪音大或风量低的技术问题。(The invention discloses an air supply device and a control method thereof, wherein the control method comprises the following steps: starting a fan of an air supply device, collecting an audio signal emitted by the air supply device at a reference rotating speed, and extracting a first frequency domain characteristic of the audio signal; matching the first frequency domain characteristic with a pre-stored frequency domain characteristic corresponding to the pipe diameter; and adjusting the rotating speed of the fan according to the preset rotating speed under the current pipe diameter, wherein the current pipe diameter is the pipe diameter corresponding to the prestored frequency domain characteristics matched with the first frequency domain characteristics. The technical scheme provided by the invention aims to solve the technical problems of high noise or low air volume caused by the fact that the rotating speed of a fan is not matched with the pipe diameter of an actually installed air inlet pipe.)

1. A control method of an air supply device is characterized in that an air inlet interface of the air supply device can be externally connected with air inlet pipes with various pipe diameters, and the control method comprises the following steps:

starting a fan of an air supply device, collecting an audio signal emitted by the air supply device at a reference rotating speed, and extracting a first frequency domain characteristic of the audio signal;

matching the first frequency domain characteristic with a pre-stored frequency domain characteristic corresponding to the pipe diameter;

adjusting the rotating speed of the fan according to the preset rotating speed under the current pipe diameter, wherein the current pipe diameter is the pipe diameter corresponding to the prestored frequency domain characteristic matched with the first frequency domain characteristic;

the prestored frequency domain characteristics corresponding to one pipe diameter are prestored frequency domain characteristics of audio signals sent by the air supply device when the air supply device is externally connected with an air inlet pipe of the pipe diameter and the fan runs at the reference rotating speed.

2. The control method according to claim 1,

will first frequency domain characteristic with correspond to the pipe diameter prestore the frequency domain characteristic and match, include:

carrying out similarity measurement on the first frequency domain characteristic and a prestored frequency domain characteristic corresponding to the pipe diameter;

the rotational speed according to presetting rotational speed under the current pipe diameter is right the rotational speed of fan is adjusted, include:

when the similarity degree between any one pre-stored frequency domain characteristic and the first frequency domain characteristic is larger than or equal to the preset degree, the rotating speed of the fan is adjusted to be the preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristic.

3. The control method according to claim 2, wherein a plurality of wind speed gears are provided, and a plurality of preset rotating speeds corresponding to the wind speed gears one to one are provided under each pipe diameter;

adjust the rotational speed of fan for this prestore preset rotational speed under the pipe diameter that the frequency domain characteristic corresponds, include:

acquiring set wind speed gear information;

and adjusting the rotating speed of the fan to be a preset rotating speed corresponding to a set wind speed gear under the pipe diameter corresponding to the pre-stored frequency domain characteristic.

4. A control method according to claim 3, wherein one preset rotating speed under one pipe diameter is taken as the reference rotating speed, and other pipe diameters correspond to a plurality of pre-stored frequency domain characteristics one by one.

5. A control method according to claim 3, wherein a pipe diameter is taken as a reference pipe diameter, and the preset rotating speeds under the reference pipe diameter are called as first preset rotating speeds;

each first preset rotating speed is provided with a plurality of pre-stored frequency domain characteristics which are in one-to-one correspondence with other pipe diameters, and the pre-stored frequency domain characteristics correspond to a preset rotating speed which is in the pipe diameter corresponding to the pre-stored frequency domain characteristics and corresponds to the same wind speed gear with the first preset rotating speed;

when a fan of the air supply device is started, a first preset rotating speed corresponding to a set wind speed gear serves as a reference rotating speed, and the pre-stored frequency domain feature which is subjected to similarity measurement with the first frequency domain feature is the pre-stored frequency domain feature corresponding to the first preset rotating speed;

when the rotating speed of the fan is adjusted, the rotating speed of the fan is adjusted to be a preset rotating speed corresponding to the pre-stored frequency domain characteristics.

6. The control method according to claim 5, characterized by further comprising:

and when the similarity degree between all the pre-stored frequency domain characteristics and the first frequency domain characteristics is smaller than the preset degree, driving the fan to continuously rotate at the reference rotating speed.

7. The control method according to any one of claims 2 to 5, wherein the pipe diameter corresponding to the pre-stored frequency domain characteristic corresponding to the lower preset rotating speed is larger under the same wind speed gear.

8. The control method according to any one of claims 2 to 5, wherein the first frequency-domain feature and the pre-stored frequency-domain features are audio spectral features, LSP line spectral pair parameters or Mel frequency cepstral coefficients.

9. The control method according to any one of claims 2 to 5, wherein the first frequency-domain feature and the pre-stored frequency-domain feature are both audio frequency spectral features;

extracting a first frequency domain feature of the audio signal, comprising:

and carrying out fast Fourier transform on the audio signal to obtain the audio frequency spectrum characteristic of the audio signal.

10. The control method according to any one of claims 2 to 5, wherein the similarity measure of the first frequency domain feature and the preset pre-stored frequency domain feature is performed by using a distance function or a similarity coefficient function.

11. An air supply device is characterized by comprising;

a fan;

the microphone is used for acquiring an audio signal sent by the air supply device;

a controller electrically connected to the microphone and the blower, configured to perform the control method of any one of claims 1 to 10.

Technical Field

The invention relates to the field of electrical equipment, in particular to a control method of an air supply device and the air supply device.

Background

At present, users have higher and higher requirements for air quality, and a plurality of families use a fresh air blower or an air conditioner with a fresh air function to circulate indoor air and outdoor air so as to keep the indoor air fresh. The fresh air machine or the air conditioner can supply air to the room through the air inlet pipe. Since the air inlet duct is usually purchased by the user himself, different users may connect air inlet ducts of different diameters to a fresh air machine or an air conditioner. The rotating speed of the fresh air machine or the air conditioner is usually fixed, and the pipe diameter of the air inlet pipe influences the air outlet resistance of the fresh air machine or the air conditioner, so that the air outlet flow of the fresh air machine or the air conditioner is influenced. Under the condition that the rotating speed of the fan is fixed, the larger the pipe diameter of the air inlet pipe is, the larger the air outlet flow is, when the pipe diameter of the air inlet pipe is too large, the overall noise is larger due to the overlarge air outlet flow, and when the pipe diameter of the air inlet pipe is too small, the air outlet speed is too slow due to the undersize air outlet flow.

Disclosure of Invention

The invention mainly aims to provide a control method of an air supply device and the air supply device, and aims to solve the technical problems of high noise or low air volume caused by the fact that the rotating speed of a fan is not matched with the pipe diameter of an actually installed air inlet pipe.

In order to achieve the above object, a method for controlling an air supply device according to an embodiment of the present invention includes:

a control method of an air supply device is characterized in that an air inlet interface of the air supply device can be externally connected with air inlet pipes with various pipe diameters, and the control method comprises the following steps:

starting a fan of an air supply device, collecting an audio signal emitted by the air supply device at a reference rotating speed, and extracting a first frequency domain characteristic of the audio signal;

matching the first frequency domain characteristic with a pre-stored frequency domain characteristic corresponding to the pipe diameter;

adjusting the rotating speed of the fan according to the preset rotating speed under the current pipe diameter, wherein the current pipe diameter is the pipe diameter corresponding to the prestored frequency domain characteristic matched with the first frequency domain characteristic;

the prestored frequency domain characteristics corresponding to one pipe diameter are prestored frequency domain characteristics of audio signals sent by the air supply device when the air supply device is externally connected with an air inlet pipe of the pipe diameter and the fan runs at the reference rotating speed.

In an exemplary embodiment, said matching said first frequency domain feature with a pre-stored frequency domain feature corresponding to said pipe diameter comprises:

carrying out similarity measurement on the first frequency domain characteristic and a prestored frequency domain characteristic corresponding to the pipe diameter;

the rotational speed according to presetting rotational speed under the current pipe diameter is right the rotational speed of fan is adjusted, include:

when the similarity degree between any one pre-stored frequency domain characteristic and the first frequency domain characteristic is larger than or equal to the preset degree, the rotating speed of the fan is adjusted to be the preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristic.

In one exemplary embodiment, the wind speed gears are multiple, and a plurality of preset rotating speeds corresponding to the wind speed gears one by one are arranged under each pipe diameter;

adjust the rotational speed of fan for this prestore preset rotational speed under the pipe diameter that the frequency domain characteristic corresponds, include:

acquiring set wind speed gear information;

and adjusting the rotating speed of the fan to be a preset rotating speed corresponding to a set wind speed gear under the pipe diameter corresponding to the pre-stored frequency domain characteristic.

In an exemplary embodiment, one preset rotation speed under one pipe diameter is used as the reference rotation speed, and the other pipe diameters correspond to a plurality of pre-stored frequency domain features one by one.

In an exemplary embodiment, a pipe diameter is taken as a reference pipe diameter, and the preset rotating speed under the reference pipe diameter is called as a first preset rotating speed;

each first preset rotating speed is provided with a plurality of pre-stored frequency domain characteristics which are in one-to-one correspondence with other pipe diameters, and the pre-stored frequency domain characteristics correspond to a preset rotating speed which is in the pipe diameter corresponding to the pre-stored frequency domain characteristics and corresponds to the same wind speed gear with the first preset rotating speed;

when a fan of the air supply device is started, a first preset rotating speed corresponding to a set wind speed gear serves as a reference rotating speed, and the pre-stored frequency domain feature which is subjected to similarity measurement with the first frequency domain feature is the pre-stored frequency domain feature corresponding to the first preset rotating speed;

when the rotating speed of the fan is adjusted, the rotating speed of the fan is adjusted to be a preset rotating speed corresponding to the pre-stored frequency domain characteristics.

In one exemplary embodiment, the control method further includes:

and when the similarity degree between all the pre-stored frequency domain characteristics and the first frequency domain characteristics is smaller than the preset degree, driving the fan to continuously rotate at the reference rotating speed.

In an exemplary embodiment, the pipe diameter corresponding to the pre-stored frequency domain characteristic corresponding to the lower preset rotating speed is larger under the same wind speed gear.

In one exemplary embodiment, the first frequency-domain feature and the pre-stored frequency-domain features are audio spectral features, LSP line spectral pair parameters, or mel-frequency cepstral coefficients.

In an exemplary embodiment, the first frequency domain feature and the pre-stored frequency domain feature are both audio frequency spectral features;

extracting a first frequency domain feature of the audio signal, comprising:

and carrying out fast Fourier transform on the audio signal to obtain the audio frequency spectrum characteristic of the audio signal.

In an exemplary embodiment, the similarity measure of the first frequency-domain feature and the preset pre-stored frequency-domain feature uses a distance function or a similarity coefficient function.

The invention also provides an air supply device, which comprises;

a fan;

the microphone is used for acquiring an audio signal sent by the air supply device;

and a controller electrically connected to the microphone and the blower and configured to perform the control method as described above.

When the first frequency domain characteristic is matched with the pre-stored frequency domain characteristic, the audio signal collected by the microphone and the audio signal corresponding to the pre-stored frequency domain characteristic belong to the same audio signal, namely the current pipe diameter of the air inlet pipe of the air supply device is the pipe diameter corresponding to the pre-stored frequency domain characteristic, and the reference rotating speed is not matched with the current pipe diameter of the air inlet pipe. The air inlet pipe is provided with a preset rotating speed matched with each pipe diameter, and the air outlet speed of the air supply device is matched with the pipe diameter of the air inlet pipe when the fan supplies air at the preset rotating speed. Therefore, when the reference rotating speed is not matched with the pipe diameter of the current air inlet pipe, the rotating speed of the fan is adjusted to the preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristic, and the condition that the noise is too high and the air supply speed of the air supply device is too low during operation of the air supply device cannot be caused.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an air supply device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the connection between the electrical appliances of the air supply device according to the embodiment of the present invention;

fig. 3 is a flowchart of a control method according to an embodiment of the invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Fan blower	11	Air inlet interface
12	Cabinet	13	Microphone (CN)
				14	Controller	2	Air inlet pipe

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

This embodiment provides an air supply device, and this air supply device can be new fan 10, the air conditioner that has new trend function, air purifier or scavenger fan. The air supply device comprises: case 12, air inlet 11, fan 10, controller 14 and microphone 13.

The fan 10 is disposed within the housing 12. The air inlet interface 11 extends out of the case 12. The fan 10 is connected with the air inlet interface 11 through a pipeline. The fan 10 includes a motor and an impeller. The impeller is sleeved on a main shaft of the motor. The motor can drive the impeller to rotate, and negative pressure is formed at the air inlet port 11 when the impeller rotates to suck air.

The air inlet interface 11 can be externally connected with an air inlet pipe 2 with various pipe diameters, and an air supply device sucks outdoor air through the air inlet pipe 2. The air inlet interface 11 is externally connected with the air inlet pipe 2 with different pipe diameters by adopting the following mode:

the air inlet interface 11 can be connected with the air inlet pipes 2 with different pipe diameters through different adapters; the air inlet pipe 2 can be a hose, and one end of the air inlet pipe 2 with different pipe diameters can be tied on the air inlet connector 11.

The controller 14 is electrically connected to the fan 10. The controller 14 can control the start and stop of the fan 10 and the speed of the fan 10. The microphone 13 is electrically connected to the controller 14. The microphone 13 may be mounted on the case 12. The microphone 13 may be a condenser microphone 13 or an electric microphone 13. The microphone 13 is electrically connected to the controller 14. The microphone 13 is used for collecting an audio signal sent by the air supply device, converting the audio signal into an electrical signal by mechanical waves, and then sending the electrical signal to the controller 14. The controller 14, upon receiving the audio signal, may store the audio signal in the form of an audio file.

The embodiment also provides a control method of the air supply device, which is implemented based on the air supply device and comprises the following steps:

step S1: receiving a starting instruction, starting a fan 10 of an air supply device, collecting an audio signal sent by the air supply device at a reference rotating speed, and extracting a first frequency domain characteristic of the audio signal;

the start instruction is used to instruct the controller 14 to start the blower 10 of the air supply device to supply air. The start instruction may be sent to the controller 14 by a user through a control panel of the air supply device or a remote controller, or may be sent through a mobile terminal, and the mobile terminal and the controller 14 may be connected through a local area network or the internet. The mobile terminal can be a mobile phone or a tablet computer.

The controller 14 drives the fan 10 of the air supply device to rotate after receiving the starting instruction, and the rotating speed of the fan 10 is a preset reference rotating speed. After the blower 10 rotates smoothly at the reference rotation speed, the controller 14 collects an audio signal emitted from the air supply device through the microphone 13. The blower 10 typically emits a sound when it is rotated at the test speed, and the controller 14 records the sound through the microphone 13 to obtain an audio signal. The duration of each recording by the microphone 13 may be a few seconds or a dozen seconds. The audio signal picked up by the microphone 13 is typically an analog signal, and the controller 14 converts the audio signal into a digital signal after receiving the audio signal.

The process by which the controller 14 converts the audio signal into a digital signal typically includes three steps of sampling, quantizing, and encoding. The sampling step is to replace the original continuous signal in time with the sample value sequence of the signal at regular intervals, i.e. to discretize the analog signal in time. The quantization step is to use a finite number of amplitude values that approximate the original continuous variation to change the continuous amplitude of the analog signal into a finite number of discrete values at certain intervals. The encoding step is to represent the quantized discrete values by binary numbers.

The controller 14 converts the audio signal in the form of an analog signal into a digital signal, which facilitates the logic operation processing of the audio signal by the central processing unit of the controller 14 in the subsequent step, and also facilitates the storage of the audio signal in the form of an audio file.

A first frequency domain feature may be extracted from the audio signal. The first frequency domain feature describes a characteristic of the audio signal in terms of frequency. The first frequency domain feature may be an audio spectral feature, an lsp (linear Spectrum pair) line spectral parameter, or a mel-frequency cepstral coefficient.

Step S2: matching the first frequency domain characteristic with a prestored frequency domain characteristic corresponding to the pipe diameter of the air inlet pipe 2;

in step S2, one of the matching methods may be to perform similarity measurement on the first frequency domain feature and a pre-stored frequency domain feature corresponding to the pipe diameter of the air inlet pipe 2 to obtain a similarity degree between the first frequency domain feature and the pre-stored frequency domain feature;

the pre-stored frequency domain characteristic is the frequency domain characteristic of an audio signal sent by the air supply device when the air supply device is externally connected with the air inlet pipe 2 with the pipe diameter corresponding to the pre-stored frequency domain characteristic and the fan 10 runs at the reference rotating speed, and the pre-stored frequency domain characteristic can be pre-stored in the controller 14. Under the condition that the fan 10 is driven at the same rotating speed, the air supply devices connected to the air inlet pipes 2 with different pipe diameters can generate different sounds, namely, the air supply devices can generate different audio signals when the air inlet pipes 2 connected to the air inlet pipes with different pipe diameters operate. Extracting frequency domain characteristics in advance from audio signals emitted by an air supply device when the air supply device runs at a reference rotating speed in a state of being connected with the air inlet pipe 2 with each pipe diameter, wherein the frequency domain characteristics are the pre-stored frequency domain characteristics of the pipe diameter of the air inlet pipe 2. The pre-stored frequency domain features may be audio spectral features, lsp (linear Spectrum pair) line spectral parameters or mel-frequency cepstral coefficients, and the pre-stored frequency domain features are of the same kind as the first frequency domain features.

And performing similarity measurement on the first frequency domain characteristic and the pre-stored frequency domain characteristic to determine the similarity degree between the first frequency domain characteristic and the pre-stored frequency domain characteristic, wherein the closer the first frequency domain characteristic and the pre-stored frequency domain characteristic are, the higher the similarity degree between the first frequency domain characteristic and the pre-stored frequency domain characteristic is. The similarity measurement method may use a distance function to calculate, where the distance function may be a euclidean distance, and the higher the similarity between the first frequency domain feature and the pre-stored frequency domain feature is, the smaller the euclidean distance is, and the lower the similarity between the first frequency domain feature and the pre-stored frequency domain feature is, the larger the euclidean distance is. The similarity measure may also be calculated using a similarity coefficient function, where the higher the similarity between the first frequency-domain feature and the pre-stored frequency-domain feature is, the closer the similarity coefficient value is to 1, and the lower the similarity between the first frequency-domain feature and the pre-stored frequency-domain feature is, the closer the similarity coefficient value is to 0.

Step S3: adjusting the rotating speed of the fan according to the preset rotating speed under the current pipe diameter, wherein the current pipe diameter is the pipe diameter corresponding to the prestored frequency domain characteristic matched with the first frequency domain characteristic;

adjusting the rotating speed of the fan according to the preset rotating speed under the current pipe diameter in the step S3 includes: and judging whether the similarity degree between the pre-stored frequency domain characteristics and the first frequency domain characteristics is greater than or equal to a preset degree or not, and when the similarity degree between any one of the pre-stored frequency domain characteristics and the first frequency domain characteristics is greater than or equal to the preset degree, adjusting the rotating speed of the fan 10 to be the preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristics.

And when the pre-stored frequency domain features are multiple, sequentially judging whether the similarity degree between each pre-stored frequency domain feature and the first frequency domain feature is greater than or equal to a preset degree.

Whether the similarity between the first frequency domain feature and the pre-stored frequency domain feature is above a preset degree is judged, which may be whether the euclidean distance between the first frequency domain feature and the pre-stored frequency domain feature is smaller than a preset distance, and when the euclidean distance between the first frequency domain feature and the pre-stored frequency domain feature is smaller than the preset distance, the similarity between the first frequency domain feature and the pre-stored frequency domain feature is considered to be above the preset degree. The predetermined distance may be experimentally calibrated.

Whether the similarity degree between the first frequency domain feature and the pre-stored frequency domain feature is above a preset degree is judged, whether a similarity coefficient value between the first frequency domain feature and the pre-stored frequency domain feature is greater than a preset value can also be judged, and when the similarity coefficient value between the first frequency domain feature and the pre-stored frequency domain feature is greater than the preset value, the similarity degree between the first frequency domain feature and the pre-stored frequency domain feature is considered to be above the preset degree. This predetermined value can be determined by experiment and is, for example, 0.8.

When the similarity between the first frequency domain feature and the pre-stored frequency domain feature is higher than the preset degree, the audio signal collected by the microphone 13 and the audio signal corresponding to the pre-stored frequency domain feature belong to the same type of audio signal, that is, the current pipe diameter of the air inlet pipe 2 of the air supply device is the pipe diameter corresponding to the pre-stored frequency domain feature, and the reference rotating speed is not matched with the current pipe diameter of the air inlet pipe 2. The air inlet pipe 2 has a preset rotating speed matched with each pipe diameter under each pipe diameter, and the air outlet speed of the air supply device is matched with the pipe diameter of the air inlet pipe 2 when the fan 10 supplies air at the preset rotating speed. Therefore, when the reference rotating speed is not matched with the pipe diameter of the current air inlet pipe 2, the rotating speed of the fan 10 is adjusted to the preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristic, and the condition that the noise is too high and the air supply speed of the air supply device is too low during the operation of the air supply device cannot be caused.

In an exemplary embodiment, multiple wind speed steps may be configured in the controller 14. The plurality of wind speed gears may be, for example, "strong gear", "high gear", "medium gear", and "low gear", respectively.

A plurality of speed groups are also provided in the controller 14. The number of the rotating speed groups is the same as the number of the types of the air inlet pipes 2 with different pipe diameters, which can be connected with the air inlet interface 11, and the rotating speed groups correspond to the pipe diameters of the air inlet pipes 2 one by one. Each rotating speed group is provided with a plurality of preset rotating speeds. And a plurality of preset rotating speeds in the rotating speed group are preset rotating speeds under the pipe diameter corresponding to the rotating speed group. The number of preset rotating speeds in each rotating speed group is the same as that of wind speed gears. A plurality of preset wind speeds in each group of wind speeds correspond to wind speed gears one by one. In each group of wind speeds, as the wind speed gear rises, the numerical value of the preset wind speed corresponding to the wind speed gear also rises.

Under the same wind speed gear, the preset rotating speed has a trend of decreasing along with the increase of the corresponding pipe diameter.

For example, the pipe diameters of the air inlet pipe 2, to which the air inlet joint 11 can be mounted, are d1, d2, d3, d1< d2< d3, respectively. The plurality of rotation speed groups are respectively a rotation speed group A, a rotation speed group B and a rotation speed group C. The pipe diameter d1 of the air inlet pipe 2 corresponds to the rotating speed group A; the pipe diameter d2 of the air inlet pipe 2 corresponds to the rotating speed group B; the pipe diameter d3 of the air inlet pipe 2 corresponds to the rotating speed group C.

The rotating speed group A comprises preset rotating speeds of a1, a2, a3, a4, a1> a2> a3> a 4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group A is as follows: the "strong gear" corresponds to a preset rotation speed a1 in the rotation speed group a, the "high gear" corresponds to a preset rotation speed a2 in the rotation speed group a, the "medium gear" corresponds to a preset rotation speed a3 in the rotation speed group a, and the "low gear" corresponds to a preset rotation speed a4 in the rotation speed group a.

The rotating speed group B comprises preset rotating speeds B1, B2, B3, B4, B1> B2> B3> B4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group B is as follows: the "strong gear" corresponds to a preset rotation speed B1 in the rotation speed group B, the "high gear" corresponds to a preset rotation speed B2 in the rotation speed group B, the "medium gear" corresponds to a preset rotation speed B3 in the rotation speed group B, and the "low gear" corresponds to a preset rotation speed B4 in the rotation speed group B.

The rotation speed group C comprises preset rotation speeds of C1, C2, C3, C4, C1> C2> C3> C4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group C is as follows: the "strong gear" corresponds to a preset rotation speed C1 in the rotation speed group C, the "high gear" corresponds to a preset rotation speed C2 in the rotation speed group C, the "medium gear" corresponds to a preset rotation speed C3 in the rotation speed group C, and the "low gear" corresponds to a preset rotation speed C4 in the rotation speed group C.

The preset rotation speeds a1, b1 and c1 have a tendency of decreasing, such as a1> b1> c1, a1> b1 ═ c1, or a1 ═ b1> c 1; the preset rotation speeds a2, b2 and c2 have a tendency to decrease, such as a2> b2> c2, or a2> b2 ═ c2, or a2 ═ b2> c 2; the preset rotation speeds a3, b3 and c3 have a tendency to decrease, such as a3> b3> c3, or a3> b3 ═ c3, or a3 ═ b3> c 3; the preset rotational speeds a4, b4, c4 have a tendency to decrease, for example, a4> b4> c4, or a4> b4 ═ c4, or a4 ═ b4> c 4.

In step S3, adjusting the rotation speed of the fan 10 to the preset rotation speed under the pipe diameter corresponding to the pre-stored frequency domain feature includes:

acquiring set wind speed gear information from a starting instruction;

according to the pre-stored frequency domain characteristics and the set wind speed gear, the rotating speed of the fan 10 is adjusted to be the preset rotating speed corresponding to the set wind speed gear under the pipe diameter corresponding to the pre-stored frequency domain characteristics.

The starting air supply instruction comprises information of a set air speed gear. For example, when the user sends an air supply start instruction to the controller 14 via a remote controller or a mobile terminal, the remote controller selects a wind speed range to be added to the air supply start instruction as a set wind speed range, and the wind speed range may be a wind speed range set when the air supply device was last started. For example, the air speed gear is switched to the "middle gear" when the air supply device is started the last time, and the air supply device is started by default at the "middle gear" when the air supply device is started the next time.

The multiple wind speed gears are arranged, so that a user can set the air supply speed of the air supply device independently, and meanwhile, at least one preset rotating speed corresponding to one wind speed gear has a trend of decreasing along with the increase of the pipe diameter corresponding to the rotating speed group in which the preset rotating speed gear is located, so that the problems that the current air inlet pipe 2 is large in pipe diameter and causes overlarge noise and the current air inlet pipe 2 is small in pipe diameter and causes an undersize air outlet speed can be avoided under the wind speed gears.

In an exemplary embodiment, a preset rotation speed under one pipe diameter is used as a reference rotation speed, and other pipe diameters correspond to a plurality of pre-stored frequency domain features one by one.

As a previous example, the user selects "mid-range" as the set wind speed gear. The preset rotating speed a1 in the rotating speed group A corresponding to the pipe diameter d1 is used as a reference rotating speed. The pipe diameter D2 corresponds to the pre-stored frequency domain signature D1. The pipe diameter D3 corresponds to the pre-stored frequency domain signature D2. The pre-stored frequency domain characteristic D1 is a frequency domain characteristic of an audio signal emitted by the air supply device when the air supply device is running on the air inlet pipe 2 with the external pipe diameter D2 and the fan 10 is at the preset rotation speed a 1. The pre-stored frequency domain characteristic D2 is a frequency domain characteristic of an audio signal emitted by the air supply device when the air supply device is running on the air inlet pipe 2 with the external pipe diameter D3 and the fan 10 is at the preset rotation speed a 1.

When the step S1 is executed, since the preset rotation speed a1 is the reference rotation speed, when the fan 10 of the air supply device is started, the fan 10 is driven to rotate at the preset rotation speed a1, and then the first frequency domain feature is extracted from the audio signal sent by the air supply device when the fan 10 is driven to rotate at the preset rotation speed a 1;

when the step S2 is executed, performing similarity measurement on the first frequency-domain feature and the pre-stored frequency-domain features D1 and D2 respectively to obtain a similarity degree Q1 of the first frequency-domain feature and the pre-stored frequency-domain feature D1 and a similarity degree Q2 of the first frequency-domain feature and the pre-stored frequency-domain feature D2;

in executing step S3, the degree of similarity Q1 and the degree of similarity Q2 are compared with preset degrees, respectively. If the current duct diameter of the air inlet duct 2 is d1, the similarity degrees Q1 and Q2 are both smaller than the predetermined degree.

If the pipe diameter of the current air inlet pipe 2 is actually D2, the similarity degree Q1 is greater than or equal to the preset degree, and the similarity degree Q2 is less than the preset degree, so the rotation speed of the fan 10 is adjusted to the preset rotation speed b3 corresponding to the pipe diameter D2 corresponding to the pre-stored frequency domain feature D1 and corresponding to the set wind speed gear "middle gear".

If the pipe diameter of the current air inlet pipe 2 is actually D3, the similarity degree Q2 is greater than or equal to the preset degree, and the similarity degree Q1 is less than the preset degree, so the rotation speed of the fan 10 is adjusted to the preset rotation speed c3 corresponding to the pipe diameter D3 corresponding to the pre-stored frequency domain feature D2 and corresponding to the set wind speed gear "middle gear".

In an exemplary embodiment, the air inlet interface 11 can be installed on the air inlet pipe 2 with pipe diameters d1, d2, d3, d1< d2< d 3. The plurality of rotation speed groups are respectively a rotation speed group A, a rotation speed group B and a rotation speed group C. The pipe diameter d1 of the air inlet pipe 2 corresponds to the rotating speed group A; the pipe diameter d2 of the air inlet pipe 2 corresponds to the rotating speed group B; the pipe diameter d3 of the air inlet pipe 2 corresponds to the rotating speed group C.

The rotating speed group A comprises preset rotating speeds of a1, a2, a3, a4, a1> a2> a3> a 4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group A is as follows: the "strong gear" corresponds to a preset rotation speed a1 in the rotation speed group a, the "high gear" corresponds to a preset rotation speed a2 in the rotation speed group a, the "medium gear" corresponds to a preset rotation speed a3 in the rotation speed group a, and the "low gear" corresponds to a preset rotation speed a4 in the rotation speed group a.

The rotating speed group B comprises preset rotating speeds B1, B2, B3, B4, B1> B2> B3> B4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group B is as follows: the "strong gear" corresponds to a preset rotation speed B1 in the rotation speed group B, the "high gear" corresponds to a preset rotation speed B2 in the rotation speed group B, the "medium gear" corresponds to a preset rotation speed B3 in the rotation speed group B, and the "low gear" corresponds to a preset rotation speed B4 in the rotation speed group B.

The rotation speed group C comprises preset rotation speeds of C1, C2, C3, C4, C1> C2> C3> C4. The corresponding relation between the wind speed gear and the various preset rotating speeds contained in the rotating speed group C is as follows: the "strong gear" corresponds to a preset rotation speed C1 in the rotation speed group C, the "high gear" corresponds to a preset rotation speed C2 in the rotation speed group C, the "medium gear" corresponds to a preset rotation speed C3 in the rotation speed group C, and the "low gear" corresponds to a preset rotation speed C4 in the rotation speed group C.

One pipe diameter is taken as a reference pipe diameter, and the preset rotating speed below the reference pipe diameter is called as a first preset rotating speed.

In the embodiment, the pipe diameter d1 is used as a reference pipe diameter, and the preset rotating speeds a1, a2, a3 and a4 under the pipe diameter d1 are all the first preset rotating speeds a1, a2, a3 and a 4.

Each first preset rotating speed is provided with a plurality of pre-stored frequency domain characteristics which are in one-to-one correspondence with other pipe diameters, the pre-stored frequency domain characteristics correspond to a preset rotating speed under the pipe diameter corresponding to the pre-stored frequency domain characteristics, and the preset rotating speed and the first preset rotating speed also correspond to the same wind speed gear.

For example, pre-stored frequency domain characteristics E1 when the blower device drives the fan 10 at a first preset rotation speed a1 under an external pipe diameter d2 are calibrated in advance, and the pre-stored frequency domain characteristics E1 correspond to a preset rotation speed b1 under a pipe diameter d 2;

pre-calibrating a pre-stored frequency domain characteristic E2 when the fan 10 is driven by the air supply device at a first preset rotating speed a1 under an external pipe diameter d3, wherein the pre-stored frequency domain characteristic E2 corresponds to a preset rotating speed c1 under a pipe diameter d 3;

pre-calibrating a pre-stored frequency domain characteristic E3 when the fan 10 is driven by the air supply device at a first preset rotating speed a2 under an external pipe diameter d2, wherein the pre-stored frequency domain characteristic E3 corresponds to a preset rotating speed b2 under a pipe diameter d 2;

pre-calibrating a pre-stored frequency domain characteristic E4 when the fan 10 is driven by the air supply device at a first preset rotating speed a2 under an external pipe diameter d3, wherein the pre-stored frequency domain characteristic E4 corresponds to a preset rotating speed c2 under a pipe diameter d 3;

pre-calibrating a pre-stored frequency domain characteristic E5 when the fan 10 is driven by the air supply device at a first preset rotating speed a3 under an external pipe diameter d2, wherein the pre-stored frequency domain characteristic E5 corresponds to a preset rotating speed b3 under a pipe diameter d 2;

pre-calibrating a pre-stored frequency domain characteristic E6 when the fan 10 is driven by the air supply device at a first preset rotating speed a3 under an external pipe diameter d3, wherein the pre-stored frequency domain characteristic E6 corresponds to a preset rotating speed c3 under a pipe diameter d 3;

pre-calibrating a pre-stored frequency domain characteristic E7 when the fan 10 is driven by the air supply device at a first preset rotating speed a4 under an external pipe diameter d2, wherein the pre-stored frequency domain characteristic E7 corresponds to a preset rotating speed b4 under a pipe diameter d 2;

pre-storing frequency domain characteristics E8 when the air supply device drives the fan 10 at a first preset rotating speed a4 under an external pipe diameter d3 are calibrated in advance, and the pre-storing frequency domain characteristics E8 correspond to a preset rotating speed c4 under a pipe diameter d 3.

In step S1, when the fan 10 of the air blower is started, the first preset rotation speed corresponding to the set wind speed gear is set as the reference rotation speed.

In this embodiment, when step S1 is executed, after the start instruction is received, the set wind speed gear information in the start instruction is read, and when the wind speed gear is "low gear", the first preset rotational speed corresponding to the "low gear" is the first preset rotational speed a4, and then the first preset rotational speed a4 is used as the reference rotational speed.

The first preset rotating speed a4 is used as a reference rotating speed, when the fan 10 of the air supply device is started, the fan 10 is driven to rotate at the first preset rotating speed a4, and then the first frequency domain characteristic is extracted from an audio signal sent by the air supply device when the fan 10 is driven to rotate at the first preset rotating speed a 4;

in step S2, the pre-stored frequency domain feature with which the similarity measurement is performed with the first frequency domain feature is the pre-stored frequency domain feature corresponding to the first preset rotation speed.

And if the corresponding pre-stored frequency domain characteristics of the first preset rotating speed a4 are the pre-stored frequency domain characteristics E7 and the pre-stored frequency domain characteristics E8, respectively performing similarity measurement on the pre-stored frequency domain characteristics E7 and the pre-stored frequency domain characteristics E8 and the first frequency domain characteristics. The similarity measurement is carried out on the pre-stored frequency domain characteristic E7 and the first frequency domain characteristic to obtain the similarity degree Q3 of the pre-stored frequency domain characteristic E8 and the first frequency domain characteristic, and the similarity measurement is carried out on the pre-stored frequency domain characteristic E8 and the first frequency domain characteristic to obtain the similarity degree Q4 of the pre-stored frequency domain characteristic E3578 and the first frequency domain characteristic.

In step S3, the rotation speed of the fan 10 is adjusted to a preset rotation speed corresponding to the pre-stored frequency domain feature, and the preset rotation speed is also a preset rotation speed at the pipe diameter corresponding to the pre-stored frequency domain feature.

In executing step S3, the degree of similarity Q3 and the degree of similarity Q4 are compared with preset degrees, respectively.

If the pipe diameter of the current air inlet pipe 2 is actually d2, the similarity degree Q3 is greater than or equal to the preset degree, and the similarity degree Q4 is less than the preset degree, so the rotation speed of the fan 10 is adjusted to the preset rotation speed b4 corresponding to the pre-stored frequency domain feature E7. The preset rotation speed c3 is also the preset rotation speed under the pipe diameter d2 corresponding to the pre-stored frequency domain feature E7.

If the pipe diameter of the current air inlet pipe 2 is actually d3, the similarity degree Q4 is greater than or equal to the preset degree, and the similarity degree Q3 is less than the preset degree, so the rotation speed of the fan 10 is adjusted to the preset rotation speed c4 corresponding to the pre-stored frequency domain feature E8. The preset rotation speed c4 is also the preset rotation speed under the pipe diameter d3 corresponding to the pre-stored frequency domain feature E8.

Further, step S3 further includes: when the similarity degree between all the pre-stored frequency domain features and the first frequency domain feature is less than the preset degree, the driving fan 10 continues to rotate at the reference rotation speed.

In the last example, the reference rotation speed is the first preset rotation speed a4, if the pipe diameter of the air inlet pipe 2 is actually d1, the similarity degrees Q3 and Q4 are both smaller than the preset degrees, and the controller 14 drives the fan 10 to continue to rotate at the first preset rotation speed a 4.

In an exemplary embodiment, the first frequency-domain feature and the pre-stored frequency-domain feature are both audio spectral features.

The complex oscillation in the audio signal is decomposed into harmonic oscillations with different amplitudes and different frequencies, and the pattern of the amplitude values of the harmonic oscillations arranged according to the frequency is called audio frequency spectrum characteristics.

In step S1, the extracting the audio frequency spectrum feature of the audio signal includes: the audio signal is subjected to a fast fourier transform to obtain audio spectral features of the audio signal.

Fast Fourier Transform (FFT) is a generic name for an efficient and fast computational method that utilizes a computer to compute a Discrete Fourier Transform (DFT), referred to as FFT. The audio signal can be transformed into audio frequency spectrum characteristics by using a fast Fourier transform algorithm. The calculation amount of the fast Fourier transform is small, real-time processing of the audio signal can be realized by combining high-speed hardware, and the calculation is faster.

In an exemplary embodiment, the air supply device is an air conditioner with a fresh air function, and the microphone 13 is only woken up when the fresh air function is turned on, and is in a sleep state for the rest of time.

The microphone 13 is only awakened to work when the fresh air function is turned on, which saves power.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.