CN116825071A

CN116825071A - Noise reduction method and device and vehicle

Info

Publication number: CN116825071A
Application number: CN202210288079.7A
Authority: CN
Inventors: 朱丽平; 吴晟; 仲旭; 邱小军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2023-09-29
Also published as: WO2023179098A1

Abstract

The application provides a noise reduction method, a noise reduction device, a vehicle and the like. Position information indicating the position of the user's head or ear is acquired by a camera or the like. Based on the positional information, the position of the speaker is controlled so that the speaker as an anti-noise source moves so as to be close to the head or the ear of the user, but there is a space from the position of the head or the ear, which is a target space within a certain range. In this state, the speaker is made to emit noise, and noise is reduced. Since the speaker emits noise in the vicinity of the ear portion, a good noise reduction effect can be obtained.

Description

Noise reduction method and device and vehicle

Technical Field

The present application relates to an intelligent vehicle, and more particularly, to a noise reduction method, a noise reduction device, an electronic device, a computer-readable storage medium, a computer program, and a vehicle.

Background

For example, when a vehicle is traveling, a complicated noise sound field is formed in the cabin due to the influence of factors such as airflow and a self-power system, and riding comfort of passengers is seriously affected. Aiming at the noise problem in the carriage, besides adding sound absorption materials and changing the mass structure in the carriage, the active noise reduction technology is also paid attention to gradually. As an active noise reduction technique applied to a vehicle, there is a scheme of realizing wideband noise reduction of a passenger head area in a vehicle cabin using a headrest speaker, for example. Specifically, a speaker as an anti-noise source is provided in the headrest of the seat, and noise in the vicinity of the head of the passenger is suppressed by the speaker to thereby reduce noise. In addition, the speaker may be provided at other positions, for example, on the vehicle body, in addition to the manner in which the speaker is provided on the headrest of the seat.

The technical problem of the active noise reduction scheme exists not only in the noise reduction technology of vehicles, but also in noise reduction technology of other sound fields such as airplanes, offices and the like.

Disclosure of Invention

The application provides a noise reduction method, a noise reduction device, an electronic device, a computer readable storage medium, a computer program, a vehicle and the like, which can improve noise reduction effect.

The first aspect of the present application relates to a noise reduction method, including: acquiring position information indicating a position of a head or an ear of a user; controlling the position of the loudspeaker according to the position information, so that a space exists between the loudspeaker and the position of the head or the ear, wherein the space is in a first range; the speaker is controlled to emit anti-noise.

By adopting the noise reduction method, the position of the loudspeaker is controlled according to the position information of the head or the ear, so that the existence interval between the loudspeaker and the head or the ear is within the first range, and the loudspeaker can emit noise at a proper position near the ear, thereby improving the noise reduction effect of the area near the ear.

As a possible implementation manner of the first aspect, acquiring location information includes: the method comprises the steps of receiving sensing information acquired by a sensor, wherein the sensor comprises one or more of a first sensor and a second sensor, the first sensor is installed on a vehicle body, the second sensor is installed on a loudspeaker, and the loudspeaker is installed on a seat.

As a possible implementation manner of the first aspect, acquiring position information of the head or the ear includes: acquiring position information of a loudspeaker; when the position information of the loudspeaker indicates that the loudspeaker is positioned between the initial position and the preset position, receiving sensing information acquired by the first sensor; receiving sensing information acquired by a second sensor when the position information of the loudspeaker indicates that the loudspeaker is positioned between a preset position and a target position; the initial position is a position where the loudspeaker is folded on the headrest of the seat, the target position is a position where the loudspeaker is in a state of being spaced from the ear, and the preset position is located between the initial position and the target position.

By adopting the mode, the first sensor and the second sensor acquire information at different positions, so that the position information of the ear is acquired, the detection precision of the position of the ear can be improved, and the noise reduction effect is improved.

As a possible implementation manner of the first aspect, the method further includes: acquiring wearing article information of the head or the ear; when the wearing article information indicates that the wearing article is not covered on the ear, the position of the speaker is controlled according to the position information of the head or the ear so that the speaker is spaced from the ear.

By adopting the mode, when the wearing article is not covered on the ear, according to the position information of the head or the ear, the loudspeaker and the head or the ear are spaced, so that the loudspeaker can be close to the ear when the loudspeaker is proper, and interference caused by the fact that the loudspeaker is close to the ear of the user when the user is not needed is avoided.

As one possible implementation of the first aspect, the wear comprises a hat and/or an earphone.

In addition, the wearing article herein is not limited to a hat and headphones, but may be other wearing articles such as a scarf.

As a possible implementation manner of the first aspect, the method further includes: when the wear includes a hat or scarf, a prompt is sent to inform the user that the ear is covered by the hat or scarf.

In the above manner, since the prompt message is sent when the wearing article comprises the cap to inform the user that the ear is covered by the cap, the user can be reliably made aware that the cap affects the approaching action of the speaker, and the user can take appropriate measures, such as taking off the cap.

As examples of the above-mentioned prompt information, a voice message or a text message may be issued, "detect that the ear is covered by the cap, so that the speaker does not track the position of the ear", or "suggest removing the cap for better noise reduction experience", or the like.

As one possible implementation manner of the first aspect, according to the position information of the head or the ear, the direction of the speaker is controlled such that the speaker is directed toward the head or the ear.

As a possible implementation manner of the first aspect, the method further includes: receiving sound information acquired by a microphone, wherein the microphone is arranged on a loudspeaker; determining anti-noise information according to sound information collected by the microphone; and according to the anti-noise information, making the loudspeaker emit anti-noise.

By determining the anti-noise information based on the sound information collected by the microphone provided to the speaker in the above manner, the noise reduction effect can be improved.

As one possible implementation manner of the first aspect, the first range is 0.5 cm-5 cm.

In this way, since the first range is 0.5 cm or more, the speaker can be prevented from contacting the user's head or ear, interfering with the user's head or ear, and preventing the user's head from moving. In addition, since the first range is 5 cm or less, the speaker can be suppressed from being too far from the head or the ear of the user, resulting in poor noise reduction effect. In addition, the specific numerical value of the first range is not limited thereto, and may be, for example, 0.5 cm to 4 cm, 1 cm to 4 cm, 1.5 cm to 4 cm, 2 cm to 4 cm, or the like.

The specific value of the first range may be set in advance according to, for example, a sound field situation or the like, and may be set according to, for example, a type or specification of a vehicle when applied to the vehicle.

As a possible implementation manner of the first aspect, the method further includes: acquiring riding information of a seat; when the seating information indicates that there is no user on the seat, the speaker is returned to an initial position, which is a position where the speaker is folded in the headrest of the seat.

Here, the seating information of the seat can indicate whether or not a user is present on the seat. The camera can be utilized to collect images of the position of the seat, and the images collected by the camera are subjected to image processing so as to detect whether a user exists on the seat. The manner of acquiring the seating information is not limited to this, and it is also possible to determine whether or not the user is present on the seat by using pressure information detected by a pressure sensor provided in the seat cushion of the seat, for example.

By adopting the mode, the loudspeaker can be folded when a user leaves the seat, so that the interference of the loudspeaker to the action of the user is avoided, and the power consumption of the loudspeaker can be reduced.

As one possible implementation of the first aspect, the speaker is returned to the initial position and directed toward the front of the seat.

In this way, since the speaker is returned to the initial position and the speaker is directed toward the front of the seat, the speaker can be made to perform a good function as a sound source for playing voice, music, and the like, and a user located on the seat can feel a good playing effect.

A second aspect of the present application relates to a noise reduction device, comprising: an acquisition module for acquiring position information indicating a position of a head or an ear of a user; the processing module is used for controlling the position of the loudspeaker according to the position information, so that the loudspeaker is spaced from the head or the ear, and the spacing is in a first range; the processing module is also used for controlling the loudspeaker to emit anti-noise.

As a possible implementation manner of the second aspect, the obtaining module is configured to: the method comprises the steps of receiving sensing information acquired by a sensor, wherein the sensor comprises one or more of a first sensor and a second sensor, the first sensor is installed on a vehicle body, the second sensor is installed on a loudspeaker, and the loudspeaker is installed on a seat.

As a possible implementation manner of the second aspect, the obtaining module is configured to: acquiring position information of a loudspeaker; when the position information of the loudspeaker indicates that the loudspeaker is positioned between the initial position and the preset position, receiving sensing information acquired by the first sensor; receiving sensing information acquired by a second sensor when the position information of the loudspeaker indicates that the loudspeaker is positioned between a preset position and a target position; the initial position is a position where the loudspeaker is folded on a headrest of the seat, the target position is a position where the loudspeaker is in a state of being spaced from the ear, and the preset position is located between the initial position and the target position.

As one possible implementation manner of the second aspect, the acquiring module is further configured to acquire wear information of the head or the ear; the processing module is used for controlling the position of the loudspeaker according to the position information of the head or the ear when the wearing article information indicates that the ear is not covered with the wearing article, so that the loudspeaker is spaced from the head or the ear.

As one possible implementation of the second aspect, the wear comprises a hat and/or an earphone.

As a possible implementation manner of the second aspect, the processing module is further configured to: when the wear includes a cap, a prompt is sent to inform the user that the ear is covered by the cap.

As a possible implementation manner of the second aspect, the processing module is further configured to: according to the position information of the head or the ear, the direction of the loudspeaker is controlled so that the loudspeaker faces the head or the ear.

As a possible implementation manner of the second aspect, the obtaining module is further configured to receive sound information collected by a microphone, where the microphone is mounted on a speaker; the processing module is also used for: determining anti-noise information according to sound information collected by the microphone; and according to the anti-noise information, making the loudspeaker emit anti-noise.

As one possible implementation manner of the second aspect, the first range is 0.5 cm-5 cm.

As a possible implementation manner of the second aspect, the acquiring module is further configured to acquire seating information of the seat; the processing module is also used for: when the seating information indicates that there is no user on the seat, the speaker is returned to an initial position, which is a position where the speaker is folded in the headrest of the seat.

As a possible implementation manner of the second aspect, the processing module is configured to: the speaker is returned to the original position and directed toward the front of the seat.

A third aspect of the application provides a loudspeaker system comprising a loudspeaker and a noise reduction device as claimed in any one of claims 11-20.

A fourth aspect of the application provides an electronic device comprising a noise reduction device according to any one of claims 11-20.

A fifth aspect of the present application provides a headrest for a seat, comprising a headrest body, a speaker, and a moving mechanism; the loudspeaker is arranged on the headrest body through the moving mechanism; the speaker is movable by the moving mechanism between an initial position in which the speaker is housed in the headrest body and is kept flush with an outer surface of the headrest body, and an extended position in which the speaker extends from the headrest body.

As one possible implementation manner of the fifth aspect, the speaker includes a housing, a speaker unit, and a position sensor; the speaker unit and the position sensor are mounted on the housing.

As one possible implementation manner of the fifth aspect, the speaker includes a housing, a speaker unit, and a sound sensor; the speaker unit and the sound sensor are installed on the shell.

A sixth aspect of the application provides a seat comprising a seat headrest of any of the above-described configurations.

A seventh aspect of the present application provides a vehicle including a seat and a noise reduction device of any one of the above structures; the seat comprises a headrest, a loudspeaker and a moving mechanism; the speaker is mounted on the headrest by a moving mechanism.

An eighth aspect of the application provides a computer-readable storage medium storing a computer program which, when executed by a computer, causes the computer to perform the noise reduction method of any one of the aspects of the first aspect.

A ninth aspect of the application provides a computer program which, when run by a computer, causes the computer to perform the noise reduction method of any of the aspects of the first aspect.

According to the scheme of the application, the position of the loudspeaker is controlled according to the position information of the head or the ear, so that the existence interval between the loudspeaker and the head or the ear is within the first range, and the loudspeaker can emit anti-noise at a proper position near the ear, so that the noise reduction effect of the area near the ear is improved. In addition, through first sensor and second sensor in the position acquisition information of difference to obtain the position information of ear, thereby can improve the detection accuracy of ear position, help improving noise reduction effect. Furthermore, when the wearing article is not covered on the ear, according to the position information of the head or the ear, the loudspeaker and the head or the ear are separated, so that the loudspeaker can be close to the ear when the loudspeaker is proper, and interference caused by the fact that the loudspeaker is close to the ear of the user when the user is not needed is avoided. Because the user is informed of the fact that the ear is covered by the cap when the wearing article comprises the cap, the user can reliably realize that the cap influences the approaching action of the loudspeaker, and the user can take proper measures, such as taking off the cap. In addition, noise information is determined from sound information collected by a microphone provided to a speaker, and noise reduction effect can be improved.

Drawings

FIG. 1 is a schematic illustration of active noise reduction control;

FIG. 2a is a schematic illustration of a vehicle according to an embodiment of the present application;

FIG. 2b is another schematic illustration of a vehicle provided in accordance with an embodiment of the present application;

fig. 3 is a schematic explanatory view of one state of a speaker provided by the embodiment of the application;

fig. 4 is a schematic structural diagram of a speaker according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of another speaker according to an embodiment of the present application;

fig. 6 is a schematic structural view of a headrest according to an embodiment of the present application;

FIG. 7a is a schematic view of another headrest according to an embodiment of the present application;

fig. 7b is a schematic view for showing an internal structure of another headrest;

fig. 8 a-11 b are schematic structural views of a headrest according to another embodiment of the present application, in which fig. 8a and 8b are schematic structural views of the headrest in a fully-unfolded state of the moving mechanism; FIGS. 9a and 9b are schematic views showing the structure of the headrest in an intermediate state of the moving mechanism; FIGS. 10a and 10b are schematic views of the headrest in another unfolded state of the movement mechanism; FIGS. 11a and 11b are schematic views showing the headrest in a fully retracted state of the moving mechanism;

FIG. 12 is an explanatory diagram of a noise reduction method according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a control device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

As an active noise reduction technique applied to a vehicle, there is a scheme of realizing wideband noise reduction of a passenger head area in a vehicle cabin using a headrest speaker, for example. Specifically, a speaker as an anti-noise source is provided in the headrest of the seat, and noise in the vicinity of the head of the passenger is suppressed by the speaker to thereby reduce noise. In addition, the speaker may be provided at other positions, for example, on the vehicle body, in addition to the manner in which the speaker is provided on the headrest of the seat.

However, these active noise reduction schemes have room for improvement in further improving the noise reduction effect. In addition, this technical problem exists not only in the noise reduction technology of vehicles but also in noise reduction technology of other sound fields such as airplanes, offices, and the like.

To this end, the present application provides a noise reduction method, a noise reduction device, an electronic apparatus, a computer-readable storage medium, a computer program, a vehicle, and the like, capable of improving noise reduction effects.

The basic principle of active noise reduction control will be briefly described.

Fig. 1 is a schematic illustration of active noise reduction control. The feed-forward active noise reduction control is shown in this figure. As shown in fig. 1, noise emitted by a noise source propagates downstream along a propagation path, a reference sensor collects a noise input signal, an error sensor collects a residual signal, the signals of the two signals are sent to a controller, the controller processes the signals through an adaptive control algorithm and outputs a control signal to an anti-noise source (i.e., a loudspeaker), so that the anti-noise source generates anti-noise which can destructively interfere with the noise, and the noise at the error sensor is effectively attenuated by superposition of the anti-noise source and the noise. In addition, when applied in a vehicle, the reference sensor may include a microphone (i.e., a microphone) and/or a vibration sensor, and the error sensor may include a microphone. The reference sensor and the error sensor herein are examples of the microphone for collecting sound information in the present application.

In addition, there is feedback-type active noise reduction control in addition to feedforward-type active noise reduction control. In the feedback type active noise reduction control scheme, the reference sensor in fig. 1 is omitted, and the control is performed by using the signal of the error sensor. It will be appreciated that the specific manner of operation within the controller in the feedback control scheme is different from that in the feedforward control scheme. In the embodiment of the application, the specific mode of the active noise reduction control is not particularly limited, and the active noise reduction control of a feedforward type can be adopted, and the active noise reduction control of a feedback type or the control of a combination of the feedforward type and the feedback type can be adopted.

In the following description, for convenience, the front-rear, left-right, up-down directions are defined with reference to the driver. That is, the direction in which the driver is seated on the vehicle faces is the front, the direction in which the driver is facing away is the rear, the left hand side of the driver is the left side, the right hand side is the right side, the driver head side is the upper side, and the foot side is the lower side. The directions used in describing the vehicle and various structural elements on the vehicle are consistent with this definition. In addition, directions defined herein are also indicated in the figures (see fig. 2a, 2 b).

In addition, while the seat may have a variety of states or attitudes, unless otherwise specified, the directions of the seat or its constituent parts described herein refer to directions in which a user on the seat faces forward in a state in which the back of the seat is substantially upright with respect to the seat cushion.

FIG. 2a is a schematic illustration of a vehicle according to an embodiment of the present application; fig. 2b is another schematic view of a vehicle according to an embodiment of the present application. The drawings are schematic, and the size and the proportional relation of the components are not necessarily drawn to actual, and are the same as the following. The type of vehicle is not particularly limited, and may be, for example, a car, a van, a passenger car, a sport utility vehicle (sport utility vehicle, SUV), or the like, or may be a fuel vehicle, or may be a new energy vehicle such as a pure electric vehicle, a hybrid vehicle, or the like.

As shown in fig. 2, the vehicle 200 includes a vehicle body 201 and a seat 100, and the seat 100 is disposed in a cabin formed by the vehicle body 201. The seat 100 includes a seat cushion 10, a backrest 20, and a headrest 30. The seat cushion 10 is used for supporting buttocks of a seated user, the backrest 20 is used for supporting the back of the seated user, and the headrest 30 is used for supporting the head and neck of the seated user.

In addition, the seat 100 also includes a speaker 40. The speaker 40 is used as an anti-noise source, and can emit anti-noise for generating destructive interference with noise, thereby realizing noise reduction. In the present embodiment, the speaker 40 is attached to the headrest 30 by the moving mechanism 50, and can move with respect to the headrest 30. As an example, the movement mechanism 50 may be a multi-degree of freedom mechanical arm that enables translation and rotation of the speaker 40. The specific structure of the robot arm, that is, the number of arms and joints thereof, etc. is not particularly limited, and any suitable structure may be employed. As other embodiments, the moving mechanism may be constituted by other forms of telescopic folding mechanism.

The seat 100 with the speaker 40 illustrated in the drawings is a main drive seat, however, the present application is not limited thereto, and may be, for example, a sub-drive seat or a rear seat. The installation position of the speaker 40 is not limited to the headrest 30, and may be provided on the backrest 20 or the vehicle body 201, for example.

In addition, as shown in fig. 2, the vehicle 200 further includes a control device 81, a sound sensor 83, and a monitoring sensor 84.

The control device 81 may be integrated in the cabin controller (Cockpit Domain Controller, CDC) or may be provided separately. In the following description, the control device 81 is described as an independent setting as an example.

The monitoring sensor 84 is an example of a sensor in the present application, and a camera, an infrared sensor, or the like may be employed for obtaining positional information of the head or the ear of the user 300 (the seated person of the seat 100, i.e., the driver in this embodiment 300). In the present embodiment, the monitoring sensor 84 is a cabin monitoring camera, and is mounted on the vehicle body 201 near the inside mirror. It will be appreciated that the mounting location of the monitoring sensor 84 is not limited thereto, and may be mounted on the left and/or right side of the dashboard, for example, or may be integrated on the display of the center console, ceiling mounted, or the like.

The image information collected by the monitoring sensor 84 may be transmitted to the cabin controller, which processes the image information, can recognize the position of the head or the ear of the user 300, obtain the position information of the head or the ear, and transmit the position information to the control device 81.

In addition, the cabin controller may also detect whether the user 300 is present on the seat 100 through image processing, obtain the seating information of the seat 100, and may transmit the seating information to the control device. The manner of acquiring the seating information is not limited thereto, and for example, it is also possible to determine whether or not the user is present on the seat 100 using the pressure information detected by the pressure sensor provided in the seat cushion 10.

It will be appreciated that these processes may also be performed by the control device 81.

In addition, the sound sensor 83 functions as an error sensor for obtaining residual noise near the ear of the user 300. In the present embodiment, the sound sensor 83 includes a microphone provided in the headrest 30. The present application is not limited to this, and a microphone may be provided in a roof or a body pillar, for example, to detect residual noise near the ear of the user 300.

The residual noise information detected by the sound sensor 83 is transmitted to the control device 81, and the control device 81 performs processing based on the residual noise information to determine anti-noise information, and transmits the anti-noise information to the speaker 40 to cause the speaker 40 to emit anti-noise, so that noise in the vicinity of the ear of the user 300 can be suppressed.

The control device 81 controls the movement mechanism 50 to operate based on the positional information of the head or the ear of the user 300, and moves the speaker 40 to the vicinity of the head or the ear of the user 300, thereby maintaining a target distance from the head or the ear of the user 300.

Specifically, the control device 81 calculates based on the positional information of the head or the ear of the user 300, obtains target positional information (may be spatial coordinates) of the speaker 40, and transmits a control instruction to (a motor or the like of) the moving mechanism 50 to move the speaker 40 to the target position, so that the speaker 40 is spaced from the head or the ear of the user 300 by a target distance.

The range of the target interval is not particularly limited, and may be, for example, a range of 0.5 cm (cm) to 5 cm, or may be other ranges. In addition, the target interval may be preset. Optionally, the target interval may also be adjusted, for example by a user or automatically. As an example of adjustment by the user, the range of the target interval may be adjusted according to the user's setting (e.g., setting by a key operation or the like).

In the present embodiment, the position of the speaker can be controlled according to the position information of the ear. The position of the speaker may be controlled based on the positional information of the head, and thus, the speaker and the ear may be controlled to have a desired interval based on the positional information of the head, considering that the position of the ear corresponds to the position of the head. Based on this, it is understood that control may also be performed based on positional information of other human body parts, such as positional information of other five sense organs other than the shoulders or ears.

In this embodiment, since the target interval is 0.5 cm or more, the speaker can be suppressed from contacting the user's head or ear, interfering with the user's head or ear, and preventing the user's head from moving. In addition, since the target interval is 5 cm or less, the speaker can be suppressed from being too far from the head or the ear of the user, resulting in poor noise reduction effect. In addition, the specific value of the range of the target interval is not limited thereto, and may be, for example, 0.5 cm to 4 cm, 1 cm to 4 cm, 1.5 cm to 4 cm, 2 cm to 4 cm, or the like.

The specific value of the target interval may be set in advance according to, for example, the sound field situation, or may be set according to, for example, the type or specification of the vehicle when the target interval is applied to the vehicle.

The control device 81 may determine the target attitude of the speaker 40 based on the position information and/or attitude information of the head or the ear, obtain target attitude information, and control the direction of the speaker 40 based on the target attitude information so that the speaker 40 is directed to the head or the ear at the target position.

Here, the posture information of the head may be, for example, a direction in which the face of the user is oriented, and the posture information of the ear may be, for example, a direction of a connecting line of the ears.

In addition, the orientation of the speaker 40 may be understood as the orientation of the diaphragm or the direction of the center line of the diaphragm. The speaker 40 may be constituted by a single speaker unit or may be constituted by a plurality of speaker units or speaker arrays. When the speaker array is formed, the orientation of the speaker 40 is understood to be the orientation of the center line of the whole of the plurality of diaphragms.

Alternatively, the speaker 40 may be positioned at a target location at a target spacing from the head or ear of the user 300 in a posture facing the head or ear of the user 300, which may be understood as the diaphragm of the speaker 40 facing the head or ear of the user 300. The facing is not limited to the "facing" manner, and may be a posture in which the speaker 40 is directed substantially toward the head or the ear.

In a state where the speaker 40 is spaced apart from the head or the ear of the user 300 by a target distance, the control device 81 causes the speaker 40 to emit anti-noise to make noise reduction.

An example of the operation of the vehicle in the present embodiment when actively reducing noise is described below.

In an initial state, for example, when the user 300 is not present on the seat 100, the speaker 40 is in the initial position retracted in the headrest 30.

The monitoring sensor 84 performs image acquisition in the cabin when the vehicle is started, or when an accessory switch of the vehicle is turned on, for example, and the cabin controller processes image information acquired by the monitoring sensor 84. When the user 300 enters the vehicle from outside the vehicle and sits on the seat 100, the cabin controller detects that the user 300 is on the seat 100. The cabin controller sends information to the control 81 indicating that there is a user 300 on the seat 100.

In addition, the cabin domain controller processes the image information collected by the monitoring sensor 84 to obtain position information of the head or the ear of the user 300, and transmits the position information of the head or the ear to the control device 81.

The control device 81 determines the target position and/or target orientation of the speaker 40 based on the positional information of the head or the ear, and transmits a control instruction to the moving mechanism to cause the moving mechanism to drive the speaker 40 to approach the head or the ear, thereby moving to the target position and/or achieving the target orientation.

The control device 81 obtains sound information from the sound sensor 83, calculates the sound information to obtain anti-noise information, and transmits a control command to the speaker 40 to cause the speaker 40 to emit anti-noise to reduce noise. The control device 81 may cause the speaker 40 to emit anti-noise immediately upon detecting the presence of the user 300 on the seat 100, or may cause the speaker 40 to emit anti-noise after the speaker 40 is moved to the target position.

In this way, the speaker 40 can be made to emit noise in the vicinity of the ear, thereby making the user 300 feel a good noise reduction effect.

When it is detected that the user 300 is away from the seat 100, that is, when the seating information transmitted from the cabin controller to the control device 81 indicates that the user 300 is not present on the seat 100, the control device 81 transmits a control instruction to the movement mechanism 50 of the speaker 40, thereby moving the speaker 40 to return to the initial position and folding the speaker in the headrest 30. In this way, the speaker 40 can be prevented from interfering with the operation of the user 300, and the power consumption of the speaker 40 can be reduced.

Meanwhile, when it is detected that the user 300 leaves the seat 100, the control device 81 stops the speaker 40 from emitting the anti-noise. When the speaker 40 is returned to the initial position, the control device 81 may stop the emission of the anti-noise from the speaker 40. In this way, the time of the noise reduction control can be appropriately prolonged, so that the noise reduction effect can be felt before the user 300 gets out of the seat 100 to get out of the vehicle completely, thereby obtaining a good user experience.

In addition, even if the user 300 is not detected to leave the seat 100, when receiving a user's instruction to cancel speaker tracking, the control device 81 returns the speaker 40 to the initial position. Canceling speaker tracking here means not moving the speaker from the initial position to a position near the head or ear. The user may issue the cancel speaker tracking instruction by operating certain keys or by voice control.

As an example, a switch is provided to the user that, when opened by the user, indicates that the user activates the "speaker tracking" function (i.e., the "speaker tracking" function is in an enabled state). In addition, when the switch is turned off by the user, it indicates that the user has canceled the "speaker tracking" function (i.e., the "speaker tracking" function is in a disabled state). At this time, if the speaker 40 is in a position close to the head or the ear, the control device 81 returns the speaker 40 to the initial position.

In addition, in a state where the switch is turned off by the user, even if the user 300 enters the vehicle from outside the vehicle, the control device 81 detects the presence of the user 300 on the seat 100, but the control device 81 does not perform control to move the speaker 40 to the vicinity of the head or the ear because the "speaker tracking" function is in a disabled state.

The switch may be a physical switch or a virtual switch. As an example of the physical switch, it may be provided on a dashboard or a center console. As an example of the virtual switch, an on-off virtual switch may be displayed on a display of the center console, and a user can switch the on-off state of the switch by a touch operation, a voice command, or the like.

In addition, it will be appreciated that a switch function may also be provided for "active noise reduction control" so that a user may turn on or off the "active noise reduction control" function. When the user selects to turn off, the control device 81 does not cause the speaker 40 to emit anti-noise. At this time, the control device 81 may cancel the "speaker tracking" function at the same time.

As other examples, the "speaker tracking" function may be activated when speaker 40 is used as a speaker for playing music or speech. At this time, the speaker 40 may be brought into contact with the user's head or ear, thereby enabling the user to obtain a good auditory experience.

With the present embodiment, since the control device 81 causes the speaker 40 as an anti-noise source to be moved at a target interval from the head or the ear of the user 300, and causes the speaker 40 to emit anti-noise at a proper position near the ear of the user, the noise reduction effect near the ear of the user 300 can be improved.

The timing at which the control device 81 starts to make the speaker 40 emit the anti-noise is not particularly limited, and for example, the emission of the anti-noise may be started when the presence of the user 300 on the seat 100 is detected, or the emission of the anti-noise may be started when the speaker 40 achieves a target interval with the head or the ear of the user 300.

In the present embodiment, when the head of the user 300 moves, the control device 81 performs the tracking process to cause the speaker 40 to move following the head of the user 300, maintaining a state of being spaced apart from the head or the ear by a target distance.

That is, the control device 81 drives the moving mechanism 50 according to the position information of the user's head or ear so that the speaker 40 can follow the passenger's head in real time, track the user's head or ear, and have a certain distance (i.e., a target interval) from the head or ear while approaching but avoiding contact with the user's head or ear, so that a better active noise reduction effect can be obtained in terms of noise reduction bandwidth and noise reduction depth.

Alternatively, the control device 81 or the cabin controller may determine whether the wearing article covers the ear of the user 300 according to image information or the like. The wearing article is, for example, a hat or an earphone, and when the hat or the earphone covers the ear of the user 300, the control device 81 may not perform control to move the speaker 40 but to be spaced apart from the head or the ear by a target distance. It will be appreciated that the wear is not limited thereto and may be, for example, a scarf.

Specifically, the control device 81 acquires the wearing article information of the head or the ear of the user, and when the wearing article information indicates that no wearing article is covered on the ear of the user 300, performs control to move the speaker 40 at a target interval from the head or the ear.

When the wear information indicates that the user 300 has the wear cover on the ear, control to move the speaker 40 to be spaced apart from the head or the ear by a target interval is not performed.

At this time, it may be further determined based on other information as to whether or not to make the speaker 40 emit anti-noise. For example, when the article of wear is a hat, the speaker 40 may be made to emit anti-noise; when the wearing article is an earphone, control for causing the speaker 40 to emit anti-noise is not performed. Alternatively, it may be determined whether or not to make the speaker 40 emit anti-noise according to the instruction of the user 300. The indication of the user 300 includes an operation instruction, a voice instruction, and/or a gesture instruction, etc.

The control to move the speaker 40 at a target interval from the head or the ear is not performed and may be determined by the user. Specifically, the user can cancel execution of control to move the speaker 40 to be spaced apart from the head or the ear by a target interval by a key operation, a voice instruction, or the like, and put the control in a disabled state.

The state shown in fig. 2 is that the control device 81 moves the speaker 40 by the movement mechanism 50 to be spaced apart from the head or the ear of the user 300 by a target interval. In addition, for example, when it is detected that there is no user on the seat 100, the control device 81 may move the speaker 40 to the position where it is retracted in the headrest 30 by the moving mechanism 50. This position is referred to as the initial position of the speaker 40. In the initial position, the speaker 40 may rest against the outer surface of the headrest 30, or may be housed within the headrest 30. It will be appreciated that when the vehicle 200 is not activated, the speaker 40 is in the home position.

Alternatively, the control device 81 may cause the speaker 40 to assume a forward-facing posture at the initial position. In this way, the speaker 40 can be used as a speaker for playing voice, music, or the like at the initial position. In addition, as another example, when playing voice or music, the speaker 40 may be in another posture.

In addition, as shown in fig. 2, in the present embodiment, two speakers 40 are provided on the headrest 30 of the seat 100, that is, two speakers 40 are provided for one user 300, the two speakers 40 corresponding to the left and right ears of the user 300, respectively. When noise reduction is performed, the control device 81 moves the two speakers 40 to the vicinity of the left ear and the right ear of the user 300, respectively.

However, the present application is not limited thereto, and for example, only one speaker 40 may be provided for one user 300. In the noise reduction, the control device 81 brings the speaker 40 close to the head or the ear of the user 300, and may equalize the distances between the speaker 40 and the left and right ears so as to achieve both the left and right ears. In this case, the installation position of the speaker 40 is not particularly limited, and may be installed on the headrest 30, or may be installed on a ceiling, for example. When provided on the headrest 30, the speaker 40 can be made to emit anti-noise in a posture from the rear toward the head of the user 300. When provided on the ceiling, the speaker 40 can be made to emit anti-noise in the posture from the above aspect toward the head of the user 300.

In addition, in the present embodiment, a preset range may be preset, and it is determined whether the position of the head or the ear of the user 300 is within the preset range according to the position information of the head or the ear, and when the head or the ear of the user 300 is within the preset range, the control device 81 controls the speaker 40 to move according to a preset target interval; when the head or the ear of the user 300 is located outside the preset range, the control device 81 may determine a new target interval according to the position information of the head or the ear, update the preset target interval to the new target interval, and control the speaker 40 to move according to the updated target interval.

Here, the preset range may be freely set, and may be set with reference to a maximum movement range of the speaker 40, for example. It is understood that different preset ranges may be set for the left and right ears of the user, respectively. In addition, the "new target interval" herein may be determined based on the minimum distance from the head or ear that the speaker 40 can reach.

In addition, as another example, the control device 81 may also cause the speaker 40 to move to the first preset position when the head or ear of the user 300 is outside the preset range.

In addition, alternatively, when it is detected that the user 300 is present on the seat 100, but the positional information of the head or the ear is not acquired, the speaker 40 may be moved to the second preset position. The first preset position and the second preset position may be positions that are shifted outward and/or forward in the left-right direction from the initial position, for example, and the first preset position and the second preset position may be the same or different.

Sometimes, for example, when a user riding on the vehicle 200 confirms the running environment through the left and right windows or observes a landscape outside the vehicle, the user's head is not directed to the front but is biased to the left or right. At this time, the control device 81 detects that the binaural positions of the user are not identical.

In this case, alternatively, the control device 81 updates the positional information of the front ear based on the positional information of the rear ear of the left and right ears. Specifically, taking the case where the head of the user 300 is biased to the left side, the control device 81 updates the front-rear coordinates of the right ear to be the same as the left ear, and the left-right coordinates of the right ear may be unchanged, so that new position information of the right ear is generated. The control device 81 controls the two speakers 40 to move according to the position information of the left ear and the updated position information of the right ear, respectively. That is, the left speaker 40 is spaced apart from the left ear of the user by a target distance, and the right speaker 40 is not actually spaced apart from the right ear of the user by a target distance, but the positions and attitudes of the left speaker 40 and the right speaker 40 are substantially symmetrical.

The control device 81 may update the left-right coordinates of the right ear, for example, by symmetrically converting the left-right coordinates of the left ear to obtain the left-right coordinates of the right ear, and the symmetry axis is a straight line passing through the center of the head of the user in the front-rear direction.

As another example, the control device 81 may determine the target position and/or the target posture of the left speaker 40 based on the position information of the left ear, and then determine the target position and/or the target posture of the right speaker 40 based on the target position and/or the target posture of the left speaker 40 so that the positions and/or the postures of the left speaker 40 and the right speaker 40 are substantially bilaterally symmetrical.

The control device 81 may control the two speakers 40 to move at a target distance from the head or the ear of the user 300, regardless of the difference in front-rear positions of the left ear and the right ear.

Alternatively, when the control device 81 determines that one ear (referred to as a first ear) of the user is within a preset range (referred to as a first preset range) corresponding thereto, and the other ear (referred to as a second ear) is not within the preset range (referred to as a second preset range) corresponding thereto, based on the position information of the ear, the target position and/or target posture of the speaker 40 (referred to as a first speaker) corresponding to the first ear is determined based on the position information of the first ear, and the target position and/or target posture of the other speaker 40 (referred to as a second speaker) corresponding to the second ear is determined based on the target position and/or target posture of the first speaker 40, so that the positions and/or postures of the speaker 40 on the left side and the speaker 40 on the right side are substantially in a laterally symmetrical state. Thus, for example, the aesthetic feeling of the overall appearance of the two speakers can be improved.

As described above, the control device 81, the speaker 40, and the like constitute a noise reduction control system that suppresses noise in the vehicle cabin. Fig. 3 is a schematic explanatory diagram of one state of a speaker provided in the embodiment of the present application. Unlike fig. 2, fig. 3 shows a state in which the speaker 40 faces the ear of the user from both left and right sides. That is, the speaker 40 may take on different positions and attitudes at the time of noise reduction depending on the position of the head of the user.

Fig. 4 is a schematic structural diagram of a speaker according to an embodiment of the present application.

As shown in fig. 4, the speaker 40A includes a housing 41, a speaker unit 42, a sound sensor 43, a position sensor 44, a passive sound absorbing material, and the like, which are not shown.

The housing 41 is generally bowl-shaped in overall, and a chamber is formed inside, the housing 41 is circular when seen from the front, the speaker unit 42, the sound sensor 43, and the position sensor 44 are mounted on the housing 41, and the speaker unit 42, the sound sensor 43, and the position sensor 44 are provided on the same side surface of the housing 41.

The speaker unit 42 is for emitting sound waves, and may have a unit case, a diaphragm, and a magnet module. The sound emission direction of the speaker unit 42 is generally suppressed from the direction of the diaphragm or the center line of the diaphragm. In the present embodiment, the speaker 40A includes two speaker units 42, which are symmetrically arranged with respect to the center line of the housing 41.

The sound sensor 43 includes a microphone for acquiring sound information. In the present embodiment, the speaker 40A includes two sound sensors 43, which are symmetrically arranged with respect to the center line of the housing 41, and are arranged at the periphery of the speaker unit 42.

The position sensor 44 is used to obtain position information of the user's head or ear, and may include a camera or an infrared sensor. When an infrared sensor is included, it may be an array of infrared sensors. In the present embodiment, the speaker 40A includes two position sensors 44, which are symmetrically arranged with respect to the center line of the housing 41, and are arranged at the periphery of the speaker unit 42. The sound sensor 43 and the position sensor 44 are arranged on the same circumferential line with a gap therebetween.

The speaker 40A shown in fig. 3 may be applied to the vehicle shown in fig. 2 and the noise reduction control system shown in fig. 3, instead of the speaker 40 therein. At this time, the sound sensor 83 in fig. 2 may be omitted, and the sound sensor 43 may be substituted for the sound sensor 83.

In addition, the position sensor 44 in fig. 4 may be used instead of the monitoring sensor 84 in fig. 2. At this time, in order to reliably detect the position of the head or the ear of the user, the control device 81 may first move the speaker 40 from the initial position to the preset position, and orient the speaker 40 to the virtual head position of the user at the preset position, so that the position information of the head or the ear of the user can be reliably acquired from the sensing information of the position sensor 44.

Alternatively, the position sensor 44 may be used in combination with the monitoring sensor 84 to detect the position of the user's head or ear. In this case, the head or ear position of the user can be detected by the fusion processing by always using the sensing information of both the position sensor 44 and the monitoring sensor 84. Or may be processed differently depending on the location of the speaker. Specifically, for example, when it is determined that the speaker is located between the initial position and a certain preset position based on the positional information of the speaker, the positional information of the head or the ear is acquired by the monitor sensor 84; when the speaker is located between the preset position and the target position, the positional information of the head or the ear is acquired only by the position sensor 44 or by both the position sensor 44 and the monitoring sensor 84.

Here, it is understood that the initial position is a position where the speaker is folded to the headrest of the seat, the target position is a position where the speaker is in a target spaced state from the head or the ear, and the preset position is located between the initial position and the target position.

It is to be understood that the wearing article information of the ear may be acquired by the position sensor 44, and whether or not the wearing article is covered on the ear may be determined.

Fig. 5 is a schematic structural diagram of another speaker according to an embodiment of the present application. As shown in fig. 5, the speaker 40B includes a housing 46, a speaker unit 42, a sound sensor 43, and a position sensor 44. The embodiment shown in fig. 5 is different from the embodiment shown in fig. 4 mainly in that the housing 46 has a substantially rectangular parallelepiped shape, and the number of speaker units 42, sound sensors 43, and position sensors 44 of the speaker 40B is one. Other structures and functions are the same as those of the embodiment shown in fig. 4, and thus a description thereof will not be repeated here.

Fig. 6 is a schematic structural view of a headrest according to an embodiment of the present application. As shown in fig. 6, a speaker 40A is provided on the headrest 30A, and the speaker 40A has the same structure as that shown in fig. 4, so a detailed description thereof is omitted here. The state shown in fig. 6 is a state in which the speaker 40A is in the initial position of the headrest 30A. As shown in fig. 6, the front surface of the headrest 30A has an opening through which the speaker 40A is accommodated in the headrest 30A in the initial position, and the speaker 40A faces forward so that the sound emission direction is forward. It will be appreciated that in order to accommodate the speaker 40A within the headrest 30A, the movement mechanism includes a telescopic structure that enables the speaker 40A to extend from within the headrest 30A and retract from the outside into the headrest 30A. The telescopic structure may take any suitable form, for example a rack and pinion type structure or a slide rail type structure, etc. It will be appreciated that the structure shown in fig. 6 may be applied to the vehicle shown in fig. 2.

FIG. 7a is a schematic view of another headrest according to an embodiment of the present application; fig. 7b is a schematic view for showing an internal structure of another headrest. As shown in fig. 7a, a speaker 40B is provided on the headrest 30B, and the speaker 40B has the same structure as the speaker 40B of fig. 5, so a detailed description thereof is omitted here. The main difference between the structure shown in fig. 7a and fig. 6 is that, in the structure shown in fig. 7a, the speaker 40B is located on the left and right side surfaces of the headrest 30B facing the outside in the left and right direction when it is in the initial position. That is, openings are provided on the left and right side surfaces of the headrest 30B (specifically, the headrest body), through which the speakers 40B are accommodated in the headrest 30B or protrude from the headrest 30B.

As shown in fig. 7B, a telescopic mechanism including a motor 61, a gear 62, a rack 63, and the like is provided inside the headrest 30B (specifically, the headrest body) to move the speaker 40B between an initial position, i.e., a position where the speaker 40B is housed in the headrest 30B (a position shown in fig. 7B), and an extended position, i.e., a position where the speaker 40B is extended from the headrest 30B. The telescopic mechanism is connected to the speaker 40B through the moving mechanism 50D, and therefore, in the extended position, the speaker 40B can also perform various positional and posture changes by the driving of the moving mechanism 50D.

In the telescopic mechanism shown in fig. 7B, in operation, the gear 62 is driven to rotate by the motor 61, and the rack 63 engaged with the gear is driven to move in the left-right direction, and the movement mechanism 50D drives the speaker 40B to move the speaker 40B left-right, thereby moving the speaker 40B between the initial position and the extended position. It goes without saying that the structure of the telescopic mechanism is not limited thereto, and various telescopic mechanisms of suitable structures, such as a worm gear mechanism, a cylinder mechanism, and the like, may be employed.

In addition, in the present embodiment, the moving mechanism 50D includes a robot arm, and the structure of the robot arm may be similar to that shown in fig. 8a to 11b below, and a detailed description is omitted here. It is understood that the structure of the moving mechanism 50D is not limited to a robot arm.

In addition, it is understood that the speaker 40B is not limited to being mounted on the headrest, and may be mounted on a backrest, for example, and in this case, since the backrest can provide a large internal space, the telescopic mechanism and the moving mechanism can be easily arranged.

Fig. 8 a-11 b are schematic structural views of yet another headrest according to embodiments of the present application. Fig. 8a and 8b are schematic views of the headrest in the fully unfolded state of the moving mechanism; FIGS. 9a and 9b are schematic views showing the structure of the headrest in an intermediate state of the moving mechanism; FIGS. 10a and 10b are schematic views of the headrest in another unfolded state of the movement mechanism; fig. 11a and 11b are schematic views of the headrest in the fully retracted state of the moving mechanism.

As shown in fig. 8a to 11b, the headrest 30C includes a headrest body 31 and a mounting bracket 32, and the headrest body 31 can be mounted on the backrest of the seat by the mounting bracket 32. In addition, the speaker 40A is attached to the headrest 30C of the present embodiment by a moving mechanism 50C. The structure of the speaker 40A is substantially the same as that shown in fig. 4, and thus a detailed description thereof will not be provided here. The movement mechanism 50C is configured as a multi-degree-of-freedom mechanical arm including an arm portion 51, an arm portion 52, an arm portion 53, a joint 54, a joint 55, a joint 56, and a joint 57, the arm portion 51 being connected to the left and right side surfaces of the headrest body 31 through the joint 54, the arm portion 52 being connected to the arm portion 51 through the joint 55, the arm portion 53 being connected to the arm portion 52 through the joint 56, and the speaker 40A being connected to the arm portion 53 through the joint 57.

The joints 54, 55, 56, 57 may be driven by a servo motor or the like with a rapid response.

In fig. 8a and 8b, the rotation axis of the joint 54 extends in the up-down direction, the rotation axis of the joint 55 extends in the horizontal direction, the rotation axis of the joint 56 extends in the up-down direction, and the rotation axis of the joint 57 extends in the horizontal direction.

In fig. 11a and 11b, the rotation axis of the joint 54 extends in the up-down direction, the rotation axis of the joint 55 extends in the horizontal direction (specifically, the left-right direction), the rotation axis of the joint 56 extends in the up-down direction, and the rotation axis of the joint 57 extends in the horizontal direction (specifically, the left-right direction).

In this way, the speaker 40A can be easily moved and rotated in three dimensions.

It will be appreciated that the headrest 30C may be applied to the vehicle shown in fig. 2, and the speaker 40A and the moving mechanism 50C may be controlled by the control device 81.

In controlling the movement and/or orientation of the speaker 40A, the control device 81 may transmit a control command to the movement mechanism 50C based on the positional information of the head or the ear, for example, as described above, and rotate the joint of the movement mechanism 50C so as to provide a target space between the speaker 40A and the head or the ear and/or to provide the speaker 40A toward the head or the ear.

An example of an operation procedure performed by the control device 81 to control the movement mechanism 50C will be described below. As shown in fig. 11a and 11b, in the initial position, the arm 52 is overlapped and abutted under the arm 51, and the arm 53 is overlapped and abutted under the arm 52, so that the three arms 51, 52, 53 are folded together, and the whole space occupation is reduced. In addition, three arm portions 51, 52, 53 are each abutted on the left and right side surfaces of the headrest body 31.

When it is necessary to move the speaker 40A to a certain position, the joint 54 drives the arm 51 to rotate about the vertical axis under the control of the control device 81, and the state shown in fig. 11a and 11b is changed to the state shown in fig. 10A and 10 b.

Then, under the control of the control device 81, the joint 55 drives the arm 52 to rotate about the horizontal axis, and the state shown in fig. 10a and 10b is changed to the state shown in fig. 9a and 9 b.

Further, under the control of the control device 81, the joint 56 drives the arm 53 to rotate about the vertical axis, and the state shown in fig. 9a and 9b is changed to the state shown in fig. 8a and 8 b.

An example of the operation of the moving mechanism 50C is described above, and the structure of the moving mechanism 50C is further described. It will be appreciated that the deployment action of the movement mechanism 50C is not so limited and any suitable deployment may be employed.

As an example of the operation, the control device 81 acquires position information of the head or the ear of the user 300 via the monitoring sensor 84 (fig. 2), and determines spatial position information of both ears of the user. The spatial position information can be X/Y/Z direction coordinate information of ears of a user by taking the center of a headrest of the seat as an origin; other positions may be used as origins, and X/Y/Z direction coordinates, distance, angle information, and the like of the user ears may be used. The position information of the edge of the head or the ear of the user may be the position information of the representative point of the head or the ear.

After that, the control device 81 calculates, confirms the space coordinates (i.e., target positions) that need to be reached when the target interval and angle exist between the speaker and the head or the ear, calculates the angle that each rotary joint of the moving mechanism 50C should rotate by means of an optimization algorithm or the like, and sends a control command (the control command includes, for example, a motor rotation command corresponding to the joint rotation angle) to the moving mechanism 50C, and drives the rotary joints 54-57 to drive the speaker 40A to quickly move to the calculated target positions.

Thereafter, the control device 81 further judges the distance to the head or the ear from the position information obtained by the position sensor 44 in the speaker 40A, and then drives the joints 56 and 57 to fine-tune the position and angle (i.e., posture) of the speaker 40A.

In this way, the speaker 40A is quickly moved based on the positional information of the head or the ear obtained by the monitoring sensor 84 provided on the vehicle body, and the position of the speaker 40A is finely adjusted based on the positional information of the head or the ear obtained by the positional sensor 44 provided on the speaker 40A, so that the speaker 40A can be quickly and accurately brought into the target state.

In the above description, the noise reduction control scheme of the present application was described by taking an application in a vehicle as an example, however, the present application is not limited thereto, and may be applied in an environment such as an airplane or an office.

The embodiment of the application also provides a noise reduction method. Fig. 12 is an explanatory diagram of a noise reduction method according to an embodiment of the present application. The control method may be executed by a processor, an electronic device, a control apparatus, a vehicle, or the like. The control apparatus such as the control apparatus 81 described above, and thus the details of the noise reduction method correspond to the processing of the control apparatus 81 described above, and thus some descriptions are omitted appropriately in the following description. The electronic device includes, for example, a device including a control device 81, such as an in-vehicle terminal, an in-vehicle smart screen, a cabin controller, or a smart terminal used in an office or the like. The processor is, for example, a processor of the control device 81 or a cabin controller or the like.

As shown in fig. 12, the noise reduction method of the present embodiment includes: s1, acquiring position information of a head or an ear of a user; s2, performing first control, namely controlling the position of the loudspeaker according to the position information of the head or the ear, so that a space exists between the loudspeaker and the position of the head or the ear, and the space is in a first range; and S3, performing second control, namely controlling the loudspeaker to emit anti-noise so as to reduce noise.

In S1, position information of the head or the ear of the user may be obtained by a (color) camera and/or an infrared sensor or the like. The sensors may be located at any suitable location in the environment. For example, when the method of the present embodiment is applied in a vehicle, the position information of the head or the ear of an occupant (i.e., user) may be acquired using a monitoring camera in the vehicle cabin.

In S2, the target position of the speaker is determined based on the position information of the head or the ear, and a control command is sent to a moving mechanism (including a motor) or the like of the speaker to move the speaker to the target position so that a desired interval can be provided between the speaker and the head or the ear.

In S3, the speaker is made to emit anti-noise so that the near-ear area of the user is noise-reduced. Here, the anti-noise information may be determined, for example, from residual noise information detected by the microphone. Here, as an example, the anti-noise information may be obtained by a slit active noise reduction algorithm. In addition, the speaker may be made to emit anti-noise before the speaker is controlled to be spaced from the head or the ear, or may be made to start emitting anti-noise again when the speaker is spaced from the head or the ear.

The first range may be, for example, 0.5 cm to 5 cm.

Optionally, the first sensor and/or the second sensor acquire the position information of the head or the ear, wherein the first sensor may be mounted on the vehicle body, the second sensor may be mounted on a speaker, and the speaker may be mounted on the seat. In addition, the speaker may be mounted at other locations.

The first sensor and the second sensor may employ a camera, an infrared sensor, or the like.

Optionally, the specific way of acquiring the position information of the head or the ear is: acquiring position information of a loudspeaker; when the position information of the loudspeaker indicates that the loudspeaker is positioned between the initial position and the preset position, receiving sensing information acquired by the first sensor; receiving sensing information acquired by a second sensor when the position information of the loudspeaker indicates that the loudspeaker is positioned between a preset position and a target position; the initial position is a position where the loudspeaker is folded on the headrest of the seat, the target position is a position where the loudspeaker is in a state of being spaced from the ear, and the preset position is located between the initial position and the target position.

In addition, as other embodiments, the position information of the head or the ear may be acquired by only the sensing information of the first sensor or the second sensor.

In addition, when the first sensor and the second sensor are provided, the first sensor may be used to obtain positional information of the head or the ear, the speaker may be rapidly moved based on the positional information, and fine adjustment may be performed on the speaker based on the positional information of the head or the ear obtained by the second sensor. In this way, the loudspeaker can be brought to a target position and/or target attitude quickly and accurately.

Optionally, the noise reduction method further includes: acquiring wearing article information of the head or the ear; when the wearing article information indicates that the wearing article is not covered on the ear, the position of the speaker is controlled according to the position information of the head or the ear so that the speaker is spaced from the ear.

Therefore, when the wearing article is not covered on the ear, according to the position information of the head or the ear, the loudspeaker and the head or the ear are spaced, and the loudspeaker can be close to the ear when the loudspeaker is proper, so that interference caused by the fact that the loudspeaker is close to the ear of the user when the user is not needed is avoided.

The wear may include a hat and/or headphones. In addition, the wearing article herein is not limited to a hat and headphones, but may be other wearing articles such as a scarf.

Alternatively, when the wear includes a hat or scarf, a notification may be sent to alert the user that the ear is covered by the hat or scarf. For example, a voice message or text message may be sent "detect that the ear is covered by the cap, so the speaker does not track the position of the ear", or "suggest removing the cap for a better noise reduction experience", etc.

In this way, because the user is informed of the "ear covered by the cap" by sending a prompt when the wearing article includes the cap, the user can be reliably made aware that the cap affects the approaching action of the speaker, so that the user can take appropriate measures, such as removing the cap.

Optionally, the noise reduction method further includes: acquiring first sound information obtained by a first microphone, wherein the first microphone is arranged on a loudspeaker; determining anti-noise information from the first sound information; the second control is performed based on the anti-noise information.

Alternatively, the orientation of the speaker may be controlled such that the speaker is oriented toward the head or the ear, based on the positional information of the head or the ear. In this way, since the direction of the speaker is controlled so that the speaker is directed toward the head or the ear, the noise reduction effect can be improved.

Optionally, the noise reduction method further includes: receiving sound information acquired by a microphone, wherein the microphone is arranged on a loudspeaker; determining anti-noise information according to sound information collected by the microphone; and according to the anti-noise information, making the loudspeaker emit anti-noise.

In this way, the noise suppression information is determined from the sound information collected by the microphone provided to the speaker, and the noise suppression effect can be improved.

The microphone is not limited to being mounted on the speaker, and the speaker may be mounted on a ceiling of a vehicle, or may be immovably mounted on a backrest or a headrest of a seat, for example, when applied to a vehicle. In addition, the speaker may be mounted on the backrest or headrest of the seat.

Optionally, the noise reduction method further includes: acquiring riding information of a seat; when the seating information indicates that there is no user on the seat, the speaker is controlled to move so as to return to an initial position, which is a position where the speaker is folded in the headrest of the seat.

Therefore, when a user leaves the seat, the loudspeaker can be folded, so that interference of the loudspeaker to actions of the user is avoided, and the power consumption of the loudspeaker can be reduced.

Optionally, the speaker is returned to the initial position and directed toward the front of the seat. .

Since the speaker is returned to the initial position and the speaker is directed toward the front of the seat, the speaker can be made to perform a good function when playing a sound source such as voice and music, and a user located on the seat can feel a good playing effect.

Corresponding to the above noise reduction method and the like, the embodiments of the present application also provide a computer-readable storage medium and a computer program, which can be stored by the computer-readable storage medium, which when executed by a computer or a processor, cause the computer to execute the above noise reduction method.

Fig. 13 is a schematic structural diagram of a control device according to an embodiment of the present application. As shown in fig. 13, the control device 81 includes a processing module 811 and an obtaining module 812, where the processing module 811 is used for executing contents such as S2 and S3 in the above noise reduction method, and the obtaining module 812 is used for executing contents such as S1. To avoid repetition, a description will not be given here. The function of the control device 81 is also described in the description with reference to fig. 1 to 3.

The function of the control device 81 may be realized by a processor executing a program (software), by hardware such as LSI (Large Scale Integration, large-scale integrated circuit) and ASIC (Application Specific Integrated Circuit ), or by a combination of software and hardware.

When the functions of the control device 81 are realized by executing a program (software) by a processor, the control device 81 may be configured by an electronic control unit (Electronic Control Unit, ECU) or a micro control unit (Microcontroller Unit, MCU). At this time, the processor included therein constitutes a processing module 811, and the transceiver circuit and the like constitute an acquisition module 812.

Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 14, the electronic device 90 includes a processor 91 and a memory 92, the memory 92 being for storing the above-described computer program as the above-described computer-readable storage medium, for example, the processor 91 being for executing the computer program to perform the above-described noise reduction method.

The electronic device includes, for example, a control device 81, and includes, for example, an in-vehicle terminal, an in-vehicle smart screen, a cabin controller, and the like, or a smart terminal applied to an office or the like.

In various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

Claims

1. A method of noise reduction, comprising:

acquiring position information indicating a position of a head or an ear of a user;

controlling the position of a loudspeaker according to the position information, so that a space exists between the loudspeaker and the position of the head or the ear, and the space is in a first range;

and controlling the loudspeaker to emit anti-noise.

2. The noise reduction method according to claim 1, wherein the acquiring the position information includes:

the method comprises the steps of receiving sensing information acquired by a sensor, wherein the sensor comprises one or more of a first sensor and a second sensor, the first sensor is installed on a vehicle body, the second sensor is installed on a loudspeaker, and the loudspeaker is installed on a seat.

3. The noise reduction method according to claim 2, wherein the acquiring the position information includes:

acquiring the position information of the loudspeaker;

receiving sensing information acquired by the first sensor when the position information of the loudspeaker indicates that the loudspeaker is positioned between an initial position and a preset position;

receiving sensing information acquired by the second sensor when the position information of the loudspeaker indicates that the loudspeaker is positioned between the preset position and the target position;

The initial position is a position where the speaker is folded in a headrest of a seat, the target position is a position where the speaker is in a state of being spaced from the ear, and the preset position is located between the initial position and the target position.

4. A noise reduction method according to any one of claims 1 to 3, further comprising:

acquiring wearing article information of the head or the ear;

when the wearing article information indicates that the wearing article is not covered on the ear, controlling the position of the speaker according to the position information of the head or the ear so that the speaker is spaced from the head or the ear.

5. The noise reduction method according to claim 4, wherein the wear comprises a hat and/or an earphone.

6. The noise reduction method according to claim 5, further comprising: when the wear includes a cap, a prompt is sent to inform the user that the ear is covered by the cap.

7. The noise reduction method according to any one of claims 1 to 6, characterized by further comprising:

and controlling the direction of the loudspeaker according to the position information of the head or the ear so that the loudspeaker faces the head or the ear.

8. The noise reduction method according to any one of claims 1 to 7, characterized by further comprising:

receiving sound information acquired by a microphone, wherein the microphone is arranged on the loudspeaker;

determining anti-noise information according to sound information collected by the microphone;

and according to the anti-noise information, making the loudspeaker emit anti-noise.

9. A method of noise reduction according to any one of claims 1 to 8, wherein the first range is 0.5 cm to 5 cm.

10. The noise reduction method according to any one of claims 1 to 9, characterized by further comprising:

acquiring riding information of a seat;

and when the riding information indicates that the user does not exist on the seat, the loudspeaker is restored to an initial position, wherein the initial position is a position where the loudspeaker is folded on a headrest of the seat.

11. The noise reduction method according to claim 10, characterized in that the speaker is returned to the initial position and directed toward the front of the seat.

12. A noise reduction device, comprising:

an acquisition module for acquiring position information indicating a position of a head or an ear of a user;

A processing module for controlling the position of a speaker according to the position information so that there is a space between the speaker and the position of the head or the ear, the space being within a first range;

the processing module is also used for controlling the loudspeaker to emit anti-noise.

13. The noise reducer of claim 12, wherein the acquisition module is configured to: the method comprises the steps of receiving sensing information acquired by a sensor, wherein the sensor comprises one or more of a first sensor and a second sensor, the first sensor is installed on a vehicle body, the second sensor is installed on a loudspeaker, and the loudspeaker is installed on a seat.

14. The noise reducer of claim 13, wherein the acquisition module is configured to:

acquiring the position information of the loudspeaker;

15. Noise reduction device according to any of the claims 12-14, characterized in that,

the acquisition module is also used for acquiring the wearing article information of the head or the ear;

the processing module is used for controlling the position of the loudspeaker according to the position information of the head or the ear when the wearing object information indicates that the ear is not covered with the wearing object, so that the loudspeaker is spaced from the head or the ear.

16. The noise reducer of claim 15, wherein the wear comprises a hat and/or an earphone.

17. The noise reducer of claim 16, wherein the processing module is further configured to: when the wear includes a cap, a prompt is sent to inform the user that the ear is covered by the cap.

18. The noise reducer of any one of claims 12-17, further comprising:

19. Noise reduction device according to any of the claims 12-18, characterized in that,

the acquisition module is also used for receiving sound information acquired by a microphone, and the microphone is arranged on the loudspeaker;

the processing module is further configured to: determining anti-noise information according to sound information collected by the microphone;

20. The noise reducer of any of claims 12-19, wherein the first range is 0.5 cm-5 cm.

21. Noise reduction device according to any of the claims 12-20, characterized in that,

the acquisition module is also used for acquiring riding information of the seat;

the processing module is further configured to: and when the riding information indicates that the user does not exist on the seat, the loudspeaker is restored to an initial position, wherein the initial position is a position where the loudspeaker is folded on a headrest of the seat.

22. The noise reducer of claim 21, wherein the processing module is configured to: the speaker is returned to the initial position and directed toward the front of the seat.

23. A loudspeaker system comprising a loudspeaker and a noise reducer as claimed in any one of claims 12 to 22.

24. An electronic device comprising the noise reducer of any one of claims 12-22.

25. A seat headrest is characterized by comprising a headrest body, a loudspeaker and a moving mechanism;

the loudspeaker is arranged on the headrest body through the moving mechanism;

the speaker is movable by the moving mechanism between an initial position in which the speaker is housed in the headrest body and is kept flush with an outer surface of the headrest body, and an extended position in which the speaker extends from the inside of the headrest body.

26. The seat headrest of claim 25, wherein the speaker comprises a housing, a speaker unit, and a position sensor;

the speaker unit and the position sensor are mounted on the housing.

27. The seat headrest of claim 25, wherein the speaker comprises a housing, a speaker unit, and a sound sensor;

the speaker unit and the sound sensor are mounted on the housing.

28. A seat comprising a seat headrest as claimed in any one of claims 25 to 27.

29. A vehicle comprising a seat and a noise reducer according to any one of claims 12 to 22;

the seat comprises a headrest, a loudspeaker and a moving mechanism;

the speaker is mounted on the headrest by the moving mechanism.

30. A computer-readable storage medium, characterized in that a computer program is stored, which, when being executed by a computer, causes the computer to perform the noise reduction method of any one of claims 1-11.

31. A computer program, characterized in that the computer program, when run by a computer, causes the computer to perform the noise reduction method of any of claims 1-11.