CN111754972A - A noise reduction device, method and electrical equipment - Google Patents

Abstract

The invention discloses a noise reduction device, method and electrical equipment. Wherein, the device includes: a sound collecting cover, which is covered outside the motor and is used for concentrated reflection of the noise generated by the motor; at least two sound wave collecting devices are installed at different positions of the sound collecting cover for A noise signal generated by the motor is collected; a control circuit is used for fitting the noise signal to generate a cancelling sound wave signal; a sound generating device is used for sending out the cancelling sound wave signal to cancel the noise signal. Through the present invention, the noise signal can be accurately restored, and the sound wave signal can be canceled by canceling it, thereby improving the noise reduction effect.

Description

A noise reduction device, method and electrical equipment

technical field

The present invention relates to the technical field of noise reduction, and in particular, to a noise reduction device, method and electrical equipment.

Background technique

The sound is produced by the vibration of the object, and most of the noise of some electrical appliances (such as vacuum cleaners) comes from the vibration of the motor. For large problems, the noise problem can be effectively solved by solving the vibration. Existing electrical appliances mainly adopt passive noise reduction methods for vibration noise, and the noise reduction effect is poor.

Aiming at the problem that the passive noise reduction method is adopted in the prior art, the noise reduction effect is poor, and no effective solution has been proposed yet.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a noise reduction device, method, and electrical equipment, so as to solve the problem of poor noise reduction effect in the prior art in which electrical appliances adopt a passive noise reduction method.

In order to solve the above technical problems, the present invention provides a noise reduction device, wherein the device includes:

The sound collecting cover is installed outside the motor and is used for concentrated reflection of the noise generated by the motor;

at least two sound wave collecting devices, installed at different positions of the sound collecting cover, for collecting the noise signal generated by the motor;

a control circuit for fitting the noise signal to generate a cancelling sound wave signal;

The sound generating device is used for sending out the canceling sound wave signal to cancel the noise signal.

Further, the phase of the canceled acoustic wave signal generated by the control circuit is opposite to the phase of the noise signal.

Further, the device includes three sound wave collection devices, corresponding to the upper, left and right sides of the motor, respectively.

Further, the device also includes:

a buffer structure, which is arranged on the bottom of the motor, and the buffer structure includes a convex part;

The base includes a concave portion, and the convex portion of the buffer structure is an elastic structure, which is embedded in the concave portion of the base and maintains a preset gap with the concave portion of the base.

Further, the convex portion of the buffer structure is hemispherical.

Further, the device also includes:

a vacuum layer, the vacuum layer sealingly covers the outside of the sound collecting cover, the at least two sound wave collecting devices, the motor, the sound generating device, the buffer structure, and the base.

The present invention also provides an electrical device, including a motor, and the above noise reduction device.

The present invention also provides a noise reduction method based on the above noise reduction device, the method comprising:

Collect noise signals at different locations;

generating a cancelling acoustic wave signal according to the noise signal;

The generating device is controlled to send out the cancelling sound wave signal to cancel the noise signal.

Further, generating a cancelling sound wave signal according to the noise signal, including:

The noise signal is fitted to generate a cancelling acoustic signal.

Further, fitting the noise signal, including:

Calculate the average value of the wave function values of different noise signals at the same time;

A wave function curve is drawn according to the average value of the wave function values at each moment in the acquisition period, and a fitted noise signal is obtained.

Further, generating a cancelling sound wave signal according to the noise signal, including:

A canceled acoustic wave signal opposite to the noise signal limit is generated according to the fitted noise signal.

The present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the above-mentioned noise reduction method is implemented.

By applying the technical solution of the present invention, the noise generated by the motor is reflected in a concentrated manner by means of a sound collecting cover placed outside the motor; at least two sound wave collecting devices are arranged, and the at least two sound wave collecting devices correspond to different positions of the motor respectively and are used for The noise signal generated by the motor is collected; a control circuit is arranged to control the sound-generating device to send out a cancelling sound wave signal according to the noise signal; Therefore, the noise signal can be accurately restored, and the sound wave signal can be canceled by canceling it, which improves the noise reduction effect.

Description of drawings

1 is a structural diagram of a noise reduction device according to an embodiment of the present invention;

2 is a structural diagram of a noise reduction device according to an embodiment of the present invention;

3 is a structural diagram of a vacuum cleaner according to an embodiment of the present invention;

FIG. 4 is a flowchart of a noise reduction method according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a," "the," and "the" as used in the embodiments of the present invention and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise, "a plurality" Generally at least two are included.

It should be understood that the term "and/or" used in this document is only an association relationship to describe the associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this text generally indicates that the related objects are an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe the microphones in the embodiments of the present invention, these microphones should not be limited by these terms. These terms are only used to distinguish between microphones located in different locations. For example, without departing from the scope of the embodiments of the present invention, the first microphone may also be referred to as the second microphone, and similarly, the second microphone may also be referred to as the first microphone.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, the phrases "if determined" or "if detected (the stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (the stated condition or event)," depending on the context )" or "in response to detection (a stated condition or event)".

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion, such that a commodity or device comprising a list of elements includes not only those elements, but also those not explicitly listed other elements, or other elements inherent to such goods or devices. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the article or device that includes the element.

The optional embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

This embodiment provides a noise reduction device, which is applied to motor noise reduction. FIG. 1 is a structural diagram of a noise reduction device according to an embodiment of the present invention. As shown in FIG. 1 , the device includes: a sound collecting cover 11 , which is covered in The outside of the motor is used for concentrated reflection of the noise generated by the motor 2, which is convenient for the collection of noise signals; at least two sound wave collection devices 12 are installed at different positions of the sound collecting cover 11 for collecting the noise signals generated by the motor 2; For example, the number of the acoustic wave collecting devices 12 can be two, which are respectively arranged in the sound collecting cover 11, on the left and right sides of the motor 2, or are respectively arranged above and on the side of the motor 2, and are installed on the sound collecting cover 11 differently. The acoustic wave collecting device 12 of the position is used for synchronously collecting the noise signal generated by the motor 2 based on different directions.

The control circuit 13 is used to fit the noise signal to generate a cancelling sound wave signal; the above-mentioned control circuit 13 is used to control the sound generating device 14 to send out the cancelling sound wave signal according to the noise signals collected by the at least two sound wave collecting devices 12, and control the The circuit 13 is specifically configured to: fit the noise signals collected by the at least two sound wave collecting devices; and control the sound generating device 14 to generate a canceled sound wave signal according to the fitted noise signals. The phase of the generated canceled acoustic signal is opposite to that of the noise signal, that is, the phase difference between the canceled acoustic signal and the noise signal is 180°, that is to say, the peak of the canceled acoustic signal corresponds to the trough of the noise signal, and the trough of the acoustic signal and the noise are canceled. corresponding to the peaks of the signal.

The sound generating device 14 is used for sending out the canceling sound wave signal under the control of the control circuit 13 to cancel the noise signal.

In the noise reduction device of this embodiment, at least two sound wave collection devices are provided, and at least two sound wave collection devices are respectively arranged at different positions of the motor to collect noise signals generated by the motor; Send out the canceling sound wave signal used to cancel the noise signal under the control of the control chip; set the control chip, according to the noise signal collected by the at least two sound wave collecting devices, control the sounding device 14 to send out the canceling sound wave signal, can accurately restore the noise signal, and The noise reduction effect is improved by canceling out the sound wave signal.

Example 2

This embodiment provides a noise reduction device. FIG. 2 is a structural diagram of a noise reduction device according to an embodiment of the present invention. As shown in FIG. 2 , the device further includes: In this embodiment, the device includes three acoustic wave acquisition The device 12 corresponds to the upper position, the left position and the right position of the motor 2 respectively, so as to collect noise signals based on different orientations.

Since the noise is generated from vibration, in addition to the above-mentioned active noise reduction method, the noise can also be reduced by blocking the vibration transmission of the motor 2 . Therefore, as shown in FIG. 2 , the device further includes: a buffer structure 15 , arranged at the bottom of the motor 2, the buffer structure includes a convex part 151; the device also includes a base 16, including a concave part 161, the convex part 151 of the buffer structure is an elastic structure, and is embedded in the concave part 161 of the base, and A preset gap is maintained with the recess 161 of the base. By arranging the buffer structure 15 and the base 16 at intervals, the natural vibration frequency of the motor during operation is destroyed, and the noise is further reduced. Specifically, the convex portion of the buffer structure 15 is hemispherical, which makes the rotation more flexible.

In order to further block the outward propagation of the noise generated by the motor 2, the noise reduction device further includes: a vacuum layer 17, the vacuum layer 17 is sealed and wrapped around the sound collecting cover 11, the sound wave collecting device 12, the motor 2, the sound generating device 14, and the buffer structure. 15, and the outside of the base 16, for preventing the noise generated by the motor 2 from propagating to the outside space, so as to reduce the noise.

Example 3

This embodiment provides a vacuum cleaner. FIG. 3 is a structural diagram of a vacuum cleaner according to an embodiment of the present invention. As shown in FIG. 3 , the vacuum cleaner includes an active noise reduction device, a motor 32 , a dust collecting device 33 and a body 34 . The active noise reduction device includes: a sound collecting cover 311 (that is, the sound collecting cover 11 in the above embodiment), three microphones (that is, the sound wave collecting device 12 in the above embodiment), and a control circuit 313 (that is, the above embodiment). The control circuit 13), the speaker 314 (that is, the sound generating device 14 in the above-mentioned embodiment), wherein, the sound collecting cover 311 is arranged outside the motor, forming a wrapping structure for the motor 32, which is conducive to the concentrated reflection of the motor noise wave signal, three installations The first microphone 312a, the second microphone 312b, and the third microphone 312c on the structure of the sound collecting cover 311 are located above, right and right of the motor, respectively. When the motor 32 is turned on, the active noise reduction device is turned on at the same time, and the three microphones are simultaneously turned on. After receiving the noise in the vacuum cleaner, it outputs three-stage noise wave signals to the control circuit. The control circuit performs fitting after receiving the three-stage noise wave signals, fitting the three-stage noise wave signals into one section, and collecting the noise waves in three positions. After the noise wave signal is fitted, the noise wave signal emitted by the motor can be better restored. After the sound wave is completed, the control circuit outputs a canceling wave signal whose phase is opposite to the fitted noise wave signal. Due to the speed of the electrical signal transmission Higher than the sound propagation, the control circuit uses the fitted noise peak sound spectrum point as the signal point to control the speaker to output the trough sound spectrum with the opposite phase to the noise wave signal peak. A heavy noise reduction.

In addition, the mounting seat below the motor 32 has a spherical buffer structure 321. The spherical buffer structure 321 is made of elastic material. There is a 1-2mm gap between the outermost layer of the spherical buffer structure 321 and the motor mounting seat 322. When the vacuum cleaner starts, the motor 32 starts to run. , the spherical buffer structure 321 at the bottom of the motor 32 destroys the natural vibration frequency transmitted to the fuselage 34 when the motor is running. The vibration noise of the fuselage driven by the vibration of the motor is reduced, so as to achieve the second level of noise reduction.

Finally, a vacuum layer 315 (ie, the vacuum layer 17 in the above embodiment) is formed by evacuating between the fuselage shell and the fuselage. The vacuum layer 315 can block noise propagation, and utilize the vacuum layer outside the fuselage to achieve the third level of noise reduction.

Example 4

This embodiment provides a noise reduction method. FIG. 4 is a flowchart of a noise reduction method according to an embodiment of the present invention. As shown in FIG. 4 , the method includes:

S101, collecting noise signals at different positions.

During specific implementation, the noise signals generated by the motor can be collected synchronously based on the different positions by means of sound wave collecting devices arranged at different positions of the motor.

S102, generating a canceled acoustic wave signal according to the noise signal.

Due to different obstacles in different locations in space and other reasons, during the propagation process, the noise signals obtained based on different positions are different. If the noise signal generated by the motor needs to be accurately restored, the noise obtained in each direction should be fully considered. Therefore, in this embodiment, the cancelling acoustic wave signal is generated from the noise signal acquired based on at least two different positions.

S103, controlling the generating device to send out the cancelling sound wave signal to cancel the noise signal.

In the noise reduction method of this embodiment, the noise signal generated by the motor is obtained based on at least two different positions; the cancelling acoustic wave signal is generated according to the noise signal obtained based on at least two different positions, so as to cancel the noise signal, and the noise can be accurately restored signal, and cancels it out by canceling the sound wave signal, improving the noise reduction effect.

Example 5

This embodiment provides another noise reduction method. In order to determine a final noise signal according to multiple noise signals, the above step S101 specifically includes: fitting the noise signals obtained based on at least two different positions; The fitted noise signal controls the sound generating device to generate a canceled sound wave signal. Specifically: calculate the average value of the wave function values of different noise signals at the same moment; draw a wave function curve according to the average value of the wave function values at each moment in the acquisition period, obtain the fitted noise signal, and draw the fitted noise signal. After the wave function curve of the combined noise signal is obtained, the control circuit generates a canceled sound wave signal opposite to the noise signal limit according to the fitted noise signal. For example, if the noise signal is obtained based on three positions, that is, through three settings Acoustic wave acquisition devices at different locations collect noises synchronously to acquire three noise signals, then calculate the average value of the wave function values of the three noise signals at the same time; The wave function curve of the noise signal after fitting the three noise signals, the fitted noise signal is obtained, and the canceled sound wave signal is generated according to the fitted noise signal. The phase of the canceled sound wave signal is opposite to the phase of the noise signal, that is, the canceled sound wave The phase difference between the signal and the noise signal is 180°, that is, the peak of the canceled acoustic signal corresponds to the trough of the noise signal, and the trough of the canceled acoustic signal corresponds to the peak of the noise signal.

Example 6

This embodiment provides a computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the noise reduction method in the foregoing embodiment is implemented.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A noise reducing device, the device comprising:

the sound collection cover is covered outside the motor and used for carrying out concentrated reflection on the noise generated by the motor;

the sound wave collecting devices are arranged at different positions of the sound collecting cover and are used for collecting noise signals generated by the motor;

the control circuit is used for fitting the noise signal to generate a cancellation sound wave signal;

and the sound generating device is used for generating the cancellation sound wave signal so as to cancel the noise signal.

2. The apparatus of claim 1, wherein the control circuit generates the cancelling acoustic wave signal with a phase opposite to a phase of the noise signal.

3. The device of claim 1, wherein the device comprises three sound wave collection devices corresponding to the upper, left and right sides of the motor.

4. The apparatus of claim 1, further comprising:

the buffer structure is arranged at the bottom of the motor and comprises a convex part;

the base comprises a concave part, the convex part of the buffer structure is of an elastic structure and is embedded into the concave part of the base, and a preset gap is kept between the convex part and the concave part of the base.

5. The apparatus of claim 4, wherein the convex portion of the cushioning structure is hemispherical.

6. The apparatus of claim 5, further comprising:

the vacuum layer, the sealed cladding of vacuum layer is in sound collection cover two at least sound wave collection system the motor sound generating mechanism buffer structure and the outside of base.

7. An electrical apparatus comprising an electrical machine, characterized in that it further comprises a noise reducing device according to any of claims 1-6.

8. A noise reduction method implemented based on the noise reduction apparatus according to any one of claims 1 to 6, the method comprising:

collecting noise signals at different positions;

generating a cancellation sound wave signal according to the noise signal;

and controlling the generating device to send out the cancellation sound wave signal so as to cancel the noise signal.

9. The method of claim 8, wherein generating a canceling acoustic signal from the noise signal comprises:

and fitting the noise signal to generate a cancellation sound wave signal.

10. The method of claim 9, wherein fitting the noise signal comprises:

calculating the average value of the wave function values of different noise signals at the same time;

and drawing a wave function curve according to the average value of the wave function values at each moment in the acquisition period to obtain a fitted noise signal.

11. The method of claim 10, wherein generating a canceling acoustic signal from the noise signal comprises:

and generating a cancellation sound wave signal which is opposite to the noise signal in limit according to the fitted noise signal.

12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the noise reduction method according to any one of claims 8 to 11.

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