Seat and vehicle

Abstract

The invention discloses a seat and a vehicle, relates to the technical field of noise control, and is used for providing stable noise reduction experience for a user. Wherein the seat comprises a seat main body and a headrest, the headrest is fixed to the seat main body, a microphone is arranged in the headrest, the seat main body comprises a backrest, a loudspeaker is arranged in the backrest, and in the first mode, the microphone is used for collecting noise, and the loudspeaker is used for playing reverse-phase noise of the noise. The microphone is arranged in the headrest close to the ears of the user, so that noise collected by the microphone is close to noise heard by the ears of the user, better noise reduction performance at the ears of the user is achieved, and the user can obtain quiet riding experience. And the loudspeaker is arranged in the backrest which is relatively far away from the ears of the user, so that even if the head of the user slightly moves, the anti-phase noise which is played by the loudspeaker and is heard by the ears of the user does not change greatly, and the user can obtain more stable noise reduction experience.

Description

Technical Field

[0001] This application relates to the technical field of noise control, and particularly to a seat and a vehicle. Background Art

[0002] During the driving process of a vehicle, due to reasons such as the friction between the airflow and the vehicle body, the friction between the tires and the ground, and the engine noise, a relatively large amount of low-frequency noise will be generated inside the vehicle, directly affecting the riding comfort and physical and mental health of passengers. To effectively suppress the low-frequency noise inside the vehicle, many studies have focused on the active noise cancellation (ANC) technology for solving the vehicle interior noise. The basic principle of the ANC technology is to generate an anti-phase noise equal to the external noise to cancel the external noise, thereby achieving the purpose of noise reduction. The ANC technology has a good control effect on low-frequency noise and is expected to become one of the main solutions for vehicle interior noise control in the future.

[0003] Currently, the ANC technology is usually combined with the vehicle seat to form a noise-reducing seat. However, the noise reduction effect of the existing mainstream noise-reducing seats is not good. If the passenger's head moves slightly, there may be a very obvious difference in the noise reduction performance, and a stable noise reduction experience cannot be provided for the passenger, so the improvement effect on the passenger's riding comfort is relatively limited.

[0004] In summary, how to provide a stable noise reduction experience for passengers is a technical problem that urgently needs to be solved in the current vehicle interior noise control field. Summary of the Invention

[0005] This application provides a seat and a vehicle to provide a stable noise reduction experience for passengers.

[0006] In a first aspect, this application provides a seat, including a seat main body and a headrest. The headrest is fixed to the seat main body, and a microphone is provided inside the headrest. The seat main body includes a backrest, and a speaker is provided inside the backrest. In a first mode, the microphone is used to collect noise, and the speaker is used to play the anti-phase noise of the noise.

[0007] In the above solution, the headrest is closer to the user's head than the backrest. Therefore, the microphone is provided on the headrest and the speaker is provided on the backrest, such that the distance between the microphone and the user's head is relatively close, while the distance between the speaker and the user's head is relatively far. In this way, the distance between the microphone and the user's ear is relatively close, such that the noise collected by the microphone is also relatively close to the noise heard by the user's ear. The anti-phase noise corresponding to this noise has a good cancellation effect on the noise heard at the user's ear, enabling better noise reduction performance at the user's ear and providing the user with a more serene riding experience. Since the distance between the speaker and the user's ear is relatively far, based on the characteristic that the sound intensity change of the sound field decreases as the distance increases, even if the user's head moves slightly, the sound played by the speaker heard by the user's ear will not change significantly, which is also helpful for providing the user with a stable noise reduction experience. It can be seen that the above solution can balance good noise reduction effect and stable noise reduction experience, effectively improving the user's riding comfort.

[0008] Optionally, the first mode is a mode with a relatively high noise reduction requirement, such as a rest mode or an immersive sound playback mode, etc. By actively reducing noise in the first mode, a relatively quiet environment can be provided for the user to rest, sleep, watch videos, etc., meeting the user's noise reduction requirements.

[0009] Optionally, in the second mode, the microphone does not work, or the microphone works, but the noise reduction degree of the speaker playing the anti-phase noise for noise reduction is lower than that corresponding to the first mode. Herein, the second mode can be understood as a mode with a relatively low noise reduction requirement, such as any mode other than the rest mode and the immersive sound playback mode.

[0010] Furthermore, optionally, in the second mode, both the microphone and the speaker may not work. In this case, there is no noise reduction in the second mode, and the speaker is only used to implement the active noise reduction function in the first mode. Or, in the second mode, the microphone does not work and the speaker works, but the content played by the speaker is different from that played in the first mode. In this case, there is no noise reduction in the second mode, and the speaker can be used to implement other functions in addition to the active noise reduction function in the first mode, such as playing road reminder information, etc. Or, in the second mode, both the microphone and the speaker work, but the noise reduction degree of the speaker playing the anti-phase noise for noise reduction is lower than that in the first mode. For example, the upper frequency limit of the anti-phase noise played by the speaker in the second mode is lower than that in the first mode. In this case, there will also be noise reduction in the second mode, but the noise reduction effect will be worse than that in the first mode. Therefore, the user can also have a certain noise reduction experience in the second mode.

[0011] In a possible design, when the backrest covers the area where the headrest is located in terms of height, the headrest can be suspended in front of the backrest, and the speaker is arranged in the area of the backrest that coincides with the headrest, for example, it can be arranged on the unobstructed backrest behind the headrest. The distance from this position to the user's ear is maintained above 10 cm, so that the user's ear is less affected by the non-uniformity of the secondary sound field of the speaker.

[0012] In a possible design, when the backrest does not cover the area where the headrest is located in terms of height, the headrest can be connected above the backrest through a connecting rod, and the speaker is arranged in the area of the backrest relative to the headrest, for example, it can be arranged on the top surface of the backrest below the headrest. The distance from this position to the user's ear can also be maintained above 10 cm, and it can also make the user's ear less affected by the non-uniformity of the secondary sound field of the speaker.

[0013] In a possible design, to improve the structural aesthetics of the backrest, the diaphragm surface of the speaker can face the user's head. For example, when the speaker is arranged on the unobstructed backrest behind the headrest, the diaphragm surface of the speaker can face forward. Another example is that when the speaker is arranged on the top surface of the backrest below the headrest, the diaphragm surface of the speaker can face upward.

[0014] In a possible design, the headrest includes a headrest main body and flipping parts swingably arranged on both sides of the headrest main body. The headrest main body is fixed to the backrest, and the microphone is arranged on the flipping parts. In the first mode, the flipping parts are in a position close to the human ear. In this way, when switching to the first mode, the flipping parts can be rotated to drive the microphone arranged on the flipping parts to move in the direction close to the user's ear, so as to reduce the distance between the microphone and the user's ear and improve the noise reduction effect at the user's ear in the first mode.

[0015] In a further possible design, in the second mode, the flipping parts are in a position far from the human ear. In this way, when switching to the second mode, the flipping parts can be rotated to move in the direction far from the user's ear, so as to provide a larger head movement space for the user in the second mode.

[0016] In an example of the above design, the flipping parts are connected to the headrest main body through a rotating mechanism, and a driver is arranged in the headrest main body. The driver is connected to the rotating mechanism. The driver is used to drive the rotating mechanism to drive the flipping parts to rotate to a position close to the human ear when determining to switch from the second mode to the first mode, and to drive the rotating mechanism to drive the flipping parts to rotate to a position far from the human ear when determining to switch from the first mode to the second mode. In this way, the rotating mechanism can be driven by the driver to drive the flipping parts to rotate, so that the microphone moves in the direction far from or close to the user's ear, so as to flexibly control the distance between the microphone and the user's ear in the first mode or the second mode.

[0017] In a further possible example, the driver is connected to a controller. The controller is configured to send first indication information to the driver when it determines that the user's head is stably resting on the headrest main body and is currently in the second mode, and to send second indication information to the driver when it determines that the user's head is not stably resting on the headrest main body and is currently in the first mode. The driver is configured to determine to switch from the second mode to the first mode according to the first indication information, and to determine to switch from the first mode to the second mode according to the second indication information.

[0018] Through the above examples, when the controller determines that the user is resting, sleeping, or in other scenarios where the head is stably resting on the headrest, it can control the rotating mechanism to drive the flipping part to rotate through the driver, so that the microphone is close to the user's ear, in order to improve the accuracy of the microphone in collecting noise and provide a more quiet environment for the user. On the contrary, when it determines that the user is not resting, not sleeping, or in other scenarios where the head is not stably resting on the headrest, it can control the rotating mechanism to drive the flipping part to rotate through the driver, so that the flipping part is away from the user's ear, in order to provide a larger head movement space for the user and facilitate the movement of the user's head.

[0019] In a further possible example, the following method 1 or method 2 can be used to determine whether the user's head is stably resting on the headrest main body:

[0020] Method 1: A pressure detection unit is provided on the headrest main body, or pressure detection units are provided on both the headrest main body and the backrest. The pressure detection unit is connected to the controller. The pressure detection unit is configured to detect the pressure of the headrest main body or the headrest main body and the backrest and send it to the controller. The controller is configured to determine that the user's head is stably resting on the headrest main body if the pressure within a set time period is greater than the pressure threshold, otherwise determine that the user's head is not stably resting on the headrest main body.

[0021] In the above method 1, the controller can determine whether the user's head is stably resting on the headrest main body by analyzing the pressure change of the user's head on the headrest main body over a period of time, or by including the pressure change of the user's back on the backrest. The acquisition frequency of the pressure detection unit is usually high and the real-time performance is good. Therefore, this method can timely determine the posture change of the user's head relative to the headrest main body. In addition, by comprehensively determining whether the user is stably resting on the headrest main body by combining the pressures of the head and the back, it can also avoid misjudgment caused by only analyzing the head pressure and help improve the accuracy of detection.

[0022] Method 2: A camera module is provided in front of the seat. The camera module is connected to the controller. The camera module is configured to capture an image of the seat and send it to the controller. The controller is configured to determine the distance between the user's head and the headrest main body of the seat according to the image. If the distance within a set time period is greater than the distance threshold, it is determined that the user's head is stably resting on the headrest main body, otherwise it is determined that the user's head is not stably resting on the headrest main body.

[0023] In the second method described above, the controller can determine whether the user's head is stably resting on the headrest body by analyzing the change in the distance between the user's head and the headrest body over a period of time. Distance detection is more intuitive than pressure detection and can make the detection more accurate.

[0024] In a further possible example, before sending the first indication information or the second indication information to the driver, the controller can also send a prompt message to the user, and the prompt message is used to prompt the user whether to turn on the first mode or the second mode. In this way, when the current state meets the switching conditions between the rest mode and the non-rest mode, by prompting the user to indicate whether to switch, the personal needs of different users can be met.

[0025] In a further possible example, after sending the first indication information to the driver, the controller can also turn on the microphone and the speaker to make the microphone and the speaker work, and then start active noise reduction.

[0026] In a further possible example, after sending the second indication information to the driver, the controller can also turn off the microphone to turn off the active noise reduction, or it can also not turn off the microphone, but reduce the noise reduction level of the speaker playing the anti-phase noise for noise reduction. For example, the noise reduction level of the speaker playing the anti-phase noise for noise reduction can be reduced by reducing the upper frequency limit of the played anti-phase noise, so as to expand the noise reduction area range, so that the user can hear the anti-phase noise played by the speaker even when the head moves to a position farther from the speaker in the non-rest mode.

[0027] In a second aspect, the present application provides a vehicle, including a controller and a seat as in the first aspect or any design in the first aspect above. The controller is configured to control the seat to be in the first mode when it detects that the user's head is stably resting on the headrest. Optionally, the controller is further configured to control the seat to be in the second mode when it detects that the user's head is not stably resting on the headrest. For the relevant content of the controller controlling the seat to achieve mode switching, reference can be made to the first aspect above, and details will not be repeated here.

[0028] The implementation and beneficial effects of the above first aspect to the second aspect will be specifically introduced in the embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Exemplarily shows a curve graph of the correlation between sound intensity and propagation distance;

[0030] Figure 2 Exemplarily shows a schematic diagram of a possible application scenario provided by the present application;

[0031] Figure 3 Exemplarily shows a schematic structural diagram of a seat provided by the present application;

[0032] Figure 4 Exemplarily shows a schematic structural diagram of a seat frame provided by the present application;

[0033] Figure 5 Exemplarily shows a schematic structural diagram of another seat provided by the present application;

[0034] Figure 6 Exemplarily shows a schematic structural diagram of a headrest provided by the present application;

[0035] Figure 7 Exemplarily shows a schematic assembly structure diagram of a headrest and a backrest provided by the present application;

[0036] Figure 8 Exemplarily shows a schematic architecture diagram of a control circuit provided by the present application;

[0037] Figure 9 Exemplarily shows a schematic interaction flow diagram of a control method provided by the present application;

[0038] Figure 10a Exemplarily shows a schematic structural diagram of another seat provided by the present application;

[0039] Figure 10b Exemplarily shows a schematic diagram of a device using a seat provided by the present application.

[0040] Reference numerals:

[0041] 100 - Seat; 101 - Seat main body; 1011 - Backrest; 1012 - Rotating shaft; 1013 - Cushion; 1014 - Seat pan frame;

[0042] 200 - Support member; 102 - Headrest; 1021 - Headrest main body; 1022 - Flipping part; 1022a - First flipping part; 1022b - Second flipping part;

[0043] 1023 - Rotating mechanism; 1023a - First rotating mechanism; 1023b - Second rotating mechanism; 103 - Speaker; 103a - First speaker;

[0044] 103b - Second speaker; 104 - Microphone; 104a - Microphone group one; 104b - Microphone group two; 105 - Pressure detection unit;

[0045] 105a - First pressure detection unit; 105b - Second pressure detection unit; 106 - Link; 107 - Driver; 300 - Controller;

[0046] 400 - Camera module. Detailed implementation manners

[0047] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0048] Hereinafter, some terms in the present application will be explained. It should be noted that these explanations are for the convenience of those skilled in the art and do not constitute a limitation on the scope of protection required by the present application.

[0049] I. ANC Technology

[0050] Generally, the implementation elements of ANC technology may include a microphone, a controller, and a speaker. The microphone is used to collect the ambient noise at the target point and send it to the controller. The controller is used to generate an anti-phase noise with a phase difference of 180 degrees from the ambient noise and send it to the speaker. The speaker is used to play the anti-phase noise. Among them, the spectrum of the anti-phase noise is the same as that of the ambient noise at the target point, but the phase is just opposite. Therefore, by superimposing the anti-phase noise on the ambient noise at the target point, the suppression and elimination of ambient noise can be effectively achieved.

[0051] II. Primary Sound Field and Secondary Sound Field

[0052] In the scenario of noise reduction using ANC technology, the primary sound field can be understood as the original noise sound at the target point when the speaker is not emitting sound, and the secondary sound field can be understood as the sound generated by the anti-phase noise emitted by the speaker at the target point. The sound field obtained by superimposing the primary sound field and the secondary sound field is the real sound at the target point. The closer the real sound approaches zero, the better the noise reduction effect on the ambient noise.

[0053] III. Non-uniformity of Sound Field

[0054] Whether it is the primary sound field or the secondary sound field, there will be non-uniform phenomena, which are mainly caused by the energy attenuation of sound during propagation. In other words, during the propagation of sound, the sound intensity will attenuate as the propagation distance increases. For example, taking a point source as an example, the correlation between the sound intensity and the propagation distance can be seen in the following formula (1.1):

[0055]

[0056] Among them, I is the sound intensity of a sound-receiving point in the sound field, P is the power of the sound emitted by the sound source, and r is the distance between the sound-receiving point and the sound source, that is, the propagation distance.

[0057] Based on the above formula (1.1), please refer to Figure 1, showing the correlation curve between the sound intensity and the propagation distance. It can be seen that within a small distance range near the sound source, the sound intensity I will rapidly decrease as the distance r between the sound-receiving point and the sound source increases (referred to as the rapid attenuation period). When the propagation distance r reaches a certain value (referred to as the mutation state point, such as the state point a shown in the figure), as the propagation distance continues to increase, the sound intensity basically tends to be constant (referred to as the stable period).

[0058] Some terms related to this application were introduced above. Next, possible application scenarios of this application will be introduced.

[0059] In a possible implementation manner, the seat in this application can be integrated into a vehicle, and the vehicle can be, for example, a sedan, a truck, a bus, a train, a recreational vehicle, a station wagon, a freight car, a playground vehicle, a construction vehicle, a tram, a golf cart, a sightseeing vehicle, a patrol vehicle, a smart vehicle, a digital car, etc. Please refer to Figure 2 , which exemplarily shows a schematic diagram of a possible application scenario of this application. In this application scenario, a sedan is taken as an example of a means of transportation. One or more seats in the sedan can be set as the seat in this application. The seat in this application can play the anti-phase noise of the in-vehicle environmental noise for the user, so as to provide a relatively quiet environment for the user sitting on this seat, and can be used to relieve the discomfort of the user affected by the in-vehicle noise during rest or sleep, or can also be used to achieve immersive sound playback. For example, it can improve the playback effect of the user watching audio and video and enhance the user's viewing experience. When the driver's seat is set as the seat in this application, this seat can also improve the listening quality of the driver to voice information such as navigation reminders or driving reminders by playing anti-phase noise for the driver, so as to achieve safe driving and efficient driving.

[0060] It should be understood that the above application scenarios are only examples. The seat provided by this application can also be applied in other possible scenarios, and is not limited to the scenarios exemplified above. For example, the seat can also be integrated on other means of transportation, such as subways, high-speed rails, ships, ferries, passenger ships, airplanes or helicopters, etc., to reduce external low-frequency noise and provide a relatively quiet environment for users, making the user's ride more comfortable. For another example, the seat can also be applied in the smart home scenario, especially in the home environment near subway stations, railway stations, airports or construction sites, as an auxiliary means for home noise reduction to improve the user's smart home experience. For another example, the seat can also be applied in the office scenario to reduce the influence of the sounds of typing or talking of users at other workstations on the user at the current workstation and improve the user's concentration on work. For another example, the seat can also be applied in public areas, such as cinemas, shopping malls, high-speed railway stations, airports, bus stations, hospitals, schools, parks, communities, squares, churches, etc., to isolate external noises and reduce the environmental noise around the user, enabling the user to be more relaxed and comfortable. And so on. They are not listed one by one here.

[0061] It should be noted that the application scenarios described in this application are for more clearly explaining the technical solutions of this application, and do not constitute a limitation on the technical solutions provided by this application.

[0062] As described in the background art, the noise reduction effect of existing noise reduction seats is not good, which is mainly due to the unreasonable setting of the positions of the microphones or speakers in the existing noise reduction seats. For example, in some existing solutions, both the microphone and the speaker are placed in the seat backrest. However, the microphone in the seat backrest is easily blocked by the user's body, resulting in a decrease in the noise intensity collected by the microphone or even no noise being collected. In addition, the seat backrest is relatively far from the user's ear. Therefore, the noise collected by the microphone is quite different from the noise actually heard by the user's ear. These two aspects both make the accuracy of the noise collected by the microphone poor and it is difficult to ensure the noise reduction effect at the user's ear. For example, experiments have found that when the distance between the microphone and the user's ear is 10 cm or more, the noise reduction effect of the noise reduction seat will be attenuated by at least 50%, and in some scenarios, it even reaches 80%. Therefore, to improve the noise reduction effect at the user's ear, the microphone needs to be placed at a position relatively close to the user's ear. Based on this, in some other existing solutions, both the microphone and the speaker are placed in the seat headrest. Although this solution can ensure that the distance between the microphone and the user's ear is relatively close, the distance between the speaker and the user's ear will also be relatively close, resulting in the distance between the user's ear and the speaker being within the distance range corresponding to the rapid attenuation period of the speaker. According to the content of the above term explanation, within this distance range, when the user moves slightly, the sound of the speaker heard by the user's ear will change greatly, which results in the superposed sound heard by the user's ear being very unstable and it is difficult to provide a stable noise reduction experience for the user's ear. It can be seen that existing noise reduction seats cannot provide a stable noise reduction experience for users while ensuring the noise reduction effect.

[0063] In view of this, this application provides a seat. The seat has the microphone placed in the headrest and the speaker placed in the backrest. In this way, the distance between the microphone and the user's ear is relatively close, which can ensure the similarity between the noise collected by the microphone and the noise heard by the user's ear, and ensure the noise reduction effect at the user's ear. And the distance between the speaker and the user's ear is relatively far, so the distance between the user's ear and the speaker can be close to or within the distance range corresponding to the stable period of the speaker. Even if the user's ear moves slightly, the sound played by the speaker heard by the user's ear will not change too much, which helps to provide a stable noise reduction experience for the user.

[0064] Based on the above content, the following combines the attached Figure 3 to the attached Figure 10b to describe in detail the solutions provided by the embodiments of this application.

[0065] In various embodiments of the present application, without special instructions and logical conflicts, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0066] In the present application, "distance" does not refer to an absolute distance and may have a certain engineering error. "Duration" does not refer to an absolute duration and may have a certain engineering error. "Direction" does not refer to an absolute direction and may have a certain engineering error.

[0067] Please refer to Figure 3 , which is a schematic structural diagram of a seat provided by the present application. Among them, Figure 3 Figure (A) in shows the front view of the seat, Figure 3 Figure (B) in shows the second mode diagram of the seat, Figure 3 Figure (C) in shows the first mode diagram of the seat. As Figure 3 shown, the seat 100 includes a seat main body 101 and a headrest 102. The headrest 102 is fixed to the seat main body 101. A microphone 104 is provided inside the headrest 102. The seat main body 101 includes a backrest 1011. A speaker 103 is provided inside the backrest 1011. In the first mode, the microphone 104 is used to collect noise, and the speaker 103 is used to play the anti-phase noise of the noise. Optionally, in the second mode, the microphone 104 does not work, or the microphone 104 works, but the output signal frequency and intensity of the speaker 103 are different from those in the first mode, for example, it can be smaller than the first mode, so that the noise reduction degree in the second mode is weaker than that in the first mode. Among them, the first mode can be understood as a mode with a higher demand for noise reduction, such as a rest mode or an immersive sound playback mode, etc. The second mode can be understood as a mode with a lower demand for noise reduction, such as any other mode except the first mode, such as a non-rest mode. The first mode and the second mode can also have other names. For example, in some scenarios, the first mode is also called the noise reduction mode, and the second mode is also called the normal mode, etc.

[0068] Optionally, the microphone 104 and the speaker 103 can be connected to a controller (not shown in the figure). The controller is used to determine to control the speaker 103 and the microphone 104 to turn on when switching from the second mode to the first mode. After the microphone 104 is turned on, it periodically collects the noise at its location (i.e., the headrest). The controller obtains this noise and generates the corresponding anti-phase noise, and then sends it to the speaker 103. The speaker 103 plays this anti-phase noise in the on state. In this way, active noise reduction in the first mode is achieved.

[0069] Next, Figure 3 each component involved will be introduced and described separately to give an exemplary specific implementation solution.

[0070] I. Seat main body

[0071] Optionally, the seat main body 101 may include a seat frame and a skin. The skin is wrapped outside the seat frame to form the appearance surface of the seat main body 101. As the supporting component of the seat main body 101, the seat frame needs to have sufficient structural strength and a certain degree of rigidity, and can usually be made of steel, aluminum, magnesium, or composite materials, etc. The skin, also known as the epidermis or cover, is in direct contact with the user and can be made of relatively soft materials, such as leather, artificial leather, fabric, or natural fiber, etc.

[0072] Further, optionally, please refer to Figure 4 , which shows a schematic structural diagram of a seat frame provided by the present application. In this example, the seat frame may include a backrest 1011, a rotating shaft 1012, and a seat cushion 1013. The backrest 1011 and the seat cushion 1013 are rotationally connected through the rotating shaft 1012. When the user sits on the seat main body 101, the user can adjust the inclination angle between the backrest 1011 and the seat cushion 1013 by rotating the backrest 1011 to find a seat state suitable for the current posture. For example, when the user needs to rest, the backrest 1011 can be rotated to a position with a larger inclination angle, making the user lean more closely on the backrest 1011 and improving the comfort of rest. When viewing the scenery, the backrest 1011 can be rotated to a position with a smaller inclination angle to view a more comprehensive scenery.

[0073] Further, optionally, please refer to Figure 4 , the seat frame may further include a seat pan frame 1014. The seat cushion 1013 is fixed on the seat pan frame 1014. The seat pan frame 1014 is placed above the support plate 200 and is slidably connected to the support plate 200. Among them, the support plate 200 can be understood as the bottom plate of the space where the seat 100 is located, such as the vehicle floor. The sliding connection between the seat pan frame 1014 and the support plate 200 can be achieved in various ways. For example, a chute is provided on the support plate 200 (or the seat pan frame 1014), and a guide rail is provided on the seat pan frame 1014 (or the support plate 200). By embedding the guide rail in the chute, the seat pan frame 1014 can slide relative to the support plate 200. With this structural design, when the user sits on the seat main body 101, the user can also slide the seat pan frame 1014 relative to the support plate 200 to find a seat position suitable for their body type. For example, a slightly fatter user can push the seat pan frame 1014 to a more rearward position, while a thinner user can push it to a more forward position, so as to have a space suitable for their body type in front of them and improve the user's riding comfort.

[0074] The above content introduces the possible structures of the seat main body 101. Next, the connection method between the seat main body 101 and the headrest 102 will be described.

[0075] Optionally, the headrest 102 is fixed to the seat body 101. It can be understood that the headrest 102 is fixedly connected to the backrest 1011 of the seat body 101. After the user leans on the backrest 1011, the user's head can be located in front of the headrest 102. When the height of the backrest 1011 is different, the fixed connection method between the headrest 102 and the backrest 1011 is also different. For example:

[0076] In one example (simply referred to as Example A), please refer to Figure 3 , when the backrest 1011 covers the area where the headrest 102 is located in terms of height, the headrest 102 can be suspended in front of the backrest 1011 and can be fixed to the backrest 1011 or the outer skin by pasting or other connection structures. In this way, the backrest 1011 behind the headrest 102 can serve as a bearing component for the headrest 102 to share the pressure of the user's head leaning on the headrest 102 and relieve the pressure on the headrest 102;

[0077] In another example (simply referred to as Example B), please refer to Figure 5 , which shows a schematic structural diagram of another seat provided by the present application. As shown in (A) in Figure 5 , when the backrest 1011 does not cover the area where the headrest 102 is located in terms of height, the seat 100 may further include a connecting rod 106, and the headrest 102 is connected above the backrest 1011 through the connecting rod 106. In this way, the headrest 102 directly bears the pressure of the user's head leaning on the headrest 102, and the connecting rod 106 provides the supporting force for the headrest 102 to be fixed in the current position. Compared with Example A, the backrest 1011 in Example B can be made shorter, and the combination form of the backrest 1011 and the headrest 102 is more flexible and beautiful, looking less cumbersome.

[0078] Furthermore, optionally, the speaker 103 is arranged in the backrest 1011. It can be understood that the speaker 103 is arranged on the backrest 1011 within the range near the user's head. The speaker 103 may include one or more, and the distance between each speaker 103 and the closest user's ear can be within a first distance range. This first distance range can be understood as the range in which the anti-phase noise played by the speaker 103 can be heard better and the change in the heard anti-phase noise is smaller when the user's head moves slightly. It can be determined by those skilled in the art according to experience or obtained through experimental tests. For example, in one example, through experimental tests, it is found that when the distance between the speaker 103 and the user's ear is within the range of [10 cm, 30 cm], the user's ear can hear the anti-phase noise with a suitable sound intensity and the change in the anti-phase noise caused by small movements is not large. Therefore, the first distance range can be set as [10 cm, 30 cm]. This range is within the stable period of the sound field where the speaker 103 plays the anti-phase noise, enabling the user's ear to hear relatively stable anti-phase noise and providing a stable noise reduction effect for the user's ear.

[0079] Further, optionally, the specific position of the speaker 103 can be set according to the distances between the user sitting on the seat 100 and various points on the backrest 1011. For example, when the headrest 102 floats in front of the backrest 1011 in the manner shown in Figure 3 , the speaker 103 can be set in the area on the backrest 1011 that coincides with the headrest 102 and is not blocked by the headrest 102. Among them, Figure 3 taking two speakers (i.e., the first speaker 103a and the second speaker 103b) as an example, the first speaker 103a and the second speaker 103b are arranged on opposite sides of the backrest 1011 behind the headrest 102. The distance between the first speaker 103a and the user's right ear is within the first distance range, and the distance between the second speaker 103b and the user's left ear is within the first distance range. Another example is that when the headrest 102 is arranged above the backrest 1011 in the manner shown in Figure 5 , the speaker 103 can be set in the area on the backrest 1011 opposite to the headrest 102. Among them, Figure 5 also taking two speakers (i.e., the first speaker 103a and the second speaker 103b) as an example, the first speaker 103a and the second speaker 103b are arranged on opposite left and right sides of the top surface of the backrest 1011. The distance between the first speaker 103a and the user's right ear and the distance between the second speaker 103b and the user's left ear are both within the first distance range.

[0080] Further, optionally, to improve the structural aesthetics of the backrest 1011, the diaphragm surface of the speaker 103 can also face the user's head. For example, please refer to Figure 3 . When the speaker 103 is set on the backrest 1011 behind the headrest 102, the user's head is in front of the headrest 102. In this case, the diaphragm surface of the speaker 103 can face forward. Or, please refer to Figure 5 . When the speaker 103 is set on the top surface of the backrest 1011, the user's head is above the backrest 1011. In this case, the diaphragm surface of the speaker 103 can face upward. However, it should be understood that this is only a possible design method. The specific direction in which the diaphragm surface of the speaker 103 faces can be determined according to the designer's habit or the actual application scenario, etc. The present application does not make specific limitations on this.

[0081] II. Headrest

[0082] Please refer to Figure 6 , which shows a schematic structural diagram of a headrest provided by the present application. Among them, Figure 6 the (A) in Figure 6 shows the front view of the headrest, Figure 6 the (B) in Figure 6As shown in (B), the headrest 102 may include a headrest main body 1021 and flipping parts 1022 swingably arranged on both sides of the headrest main body 1021, such as a first flipping part 1022a arranged on the right side and a second flipping part 1022b arranged on the left side. The first flipping part 1022a and the second flipping part 1022b are respectively rotationally connected (also known as driving connection) to the headrest main body 1021, and can rotate relatively around the headrest main body 1021 along the +X direction shown in the figure, or rotate away from each other along the -X direction shown in the figure. Among them, microphones 104 can be arranged in both the first flipping part 1022a and the second flipping part 1022b. During the process of switching from the second mode to the first mode, the first flipping part 1022a and the second flipping part 1022b rotate relatively along the +X direction shown in the figure and stop at positions close to the user's ears, such as Figure 3 shown in (C) or Figure 5 shown in (C). At this time, the microphones 104 arranged inside the first flipping part 1022a and the second flipping part 1022b are also close to the user's ears. Therefore, the difference in the primary sound field noise received by the microphones 104 and the user's ears is small. If the speaker 103 is already playing anti-phase noise, the difference in the secondary sound field noise received by the microphones 104 and the user's ears is also small. The noise collected by the microphones 104 is relatively close to the noise heard at the user's ears. Using this noise for active noise reduction can effectively adapt to the user's noise reduction requirements for the first mode. On the contrary, during the process of switching from the first mode to the second mode, the first flipping part 1022a and the second flipping part 1022b rotate away from each other along the -X direction shown in the figure and stop at positions far from the user's ears, such as Figure 3 shown in (B) or Figure 5 shown in (B). At this time, the first flipping part 1022a and the second flipping part 1022b are flattened, so that the user can have a larger head movement space, effectively adapting to the user's head movement requirements for the second mode.

[0083] Optionally, the headrest 102 is fixed to the seat main body 101, which may mean that the headrest main body 1021 is fixed to the backrest 1011. Among them, the headrest main body 1021 includes an epidermis and a filler. The filler is filled inside the epidermis to support the epidermis. The filler can be a relatively soft substance such as sponge. When the headrest 102 is suspended in front of the backrest 1011 in the manner Figure 3 shown, the headrest main body 1021 can be fixed to the backrest 1011 by means of pasting, etc. For example, the epidermis of the headrest main body 1021 is pasted on the backrest 1011. When the headrest 102 is in the manner Figure 5When connected above the backrest 1011 in the manner shown, the headrest main body 1021 can be connected to the backrest 1011 through a connecting rod 106. For example, one end of the connecting rod 106 is placed inside the skin of the headrest main body 1021, and the other end is connected to the backrest 1011. In this way, when the flipping part 1022 rotates relative to or away from the headrest main body 1021, the flipping part 1022 will rotate in a direction away from or closer to the backrest 1011, so that the distance between the microphone 104 provided in the flipping part 1022 and the speaker 103 provided in the backrest 1011 becomes larger or smaller.

[0084] Optionally, please continue to refer to Figure 6 , the headrest 102 may further include a rotating mechanism 1023, and the flipping part 1022 is rotationally connected to the headrest main body 1021 through the rotating mechanism 1023. Among them, the rotating mechanism 1023 can be, for example, a rotating shaft, a hinge, a gear, a universal joint, or other mechanisms that can achieve relative rotation of two components. The rotating mechanism 1023 may specifically include a first rotating mechanism 1023a and a second rotating mechanism 1023b. The first flipping part 1022a is rotationally connected to the headrest main body 1021 through the first rotating mechanism 1023a, and the second flipping part 1022b is rotationally connected to the headrest main body 1021 through the second rotating mechanism 1023b. In some scenarios, to ensure the synchronism of the rotation of the first flipping part 1022a and the second flipping part 1022b, the first rotating mechanism 1023a and the second rotating mechanism 1023b can also be connected through a synchronization component (not shown in the figure). The synchronization component can be composed of two gears, for example. The two gears mesh with each other, and one of the gears is connected to the first rotating mechanism 1023a, and the other gear is connected to the second rotating mechanism 1023b. Through the relative transmission of the two gears, the rotation directions of the two rotating mechanisms can be opposite, but the rotation angles are the same.

[0085] Furthermore, optionally, the headrest 102 may further include a driver 107. The driver 107 can be, for example, a motor. The driver 107 is connected to the rotating mechanism 1023 and is used to drive the rotating mechanism 1023 to drive the flipping part 1022 to rotate. For example, when switching from the second mode to the first mode, the driver 107 can drive the first rotating mechanism 1023a to drive the first flipping part 1022a to rotate, and drive the second rotating mechanism 1023b to drive the second flipping part 1022b to rotate, so that the first flipping part 1022a and the second flipping part 1022b rotate relative to each other to the position shown in (C) of Figure 3 or Figure 5 shown in (C) of. And when switching from the first mode to the second mode, the driver 107 can drive the first rotating mechanism 1023a to drive the first flipping part 1022a to rotate, and drive the second rotating mechanism 1023b to drive the second flipping part 1022b to rotate, so that the first flipping part 1022a and the second flipping part 1022b rotate away from each other toFigure 3 in (B) or Figure 5 the position shown in (B).

[0086] The above-mentioned driver 107 can be set at any position of the headrest 102, such as Figure 6 taking the case where the driver 107 is set in the headrest main body 1021 as an example. In this way, the driver 107 can be directly connected to the rotating mechanisms 1023 on both sides through the wire routing arranged in the headrest main body 1021, without passing through the movable part between the flipping part 1022 and the headrest main body 1021, so as to avoid damage caused by frequent bending of the wire routing. It should be understood that in other possible setting methods, the driver 107 can also be set in one side flipping part 1022, or set in both side flipping parts 1022 and respectively connect the corresponding rotating mechanisms 1023, or set in the backrest 1011, etc. The present application does not make specific limitations on this.

[0087] Taking the case where the headrest 102 floats in front of the backrest 1011 and the driver 107 is set in the headrest main body 1021 as an example, please refer to Figure 7 , which shows a schematic diagram of the assembly structure of a headrest and a backrest provided by the present application. Figure 7 Only the backrest of the area overlapping with the headrest is shown in Figure 7 The left side in shows a three-dimensional view of the assembly structure. Figure 7 The right side in shows multiple slices obtained by slicing the assembly structure of the left three-dimensional view. As Figure 7 shown, the assembly structure is integrally sliced into slice S1 and slice S2. Slice S1 is the slice corresponding to the backrest 1011 part, and can be considered as the slice obtained by cutting out the backrest 1011 part from the assembly structure along the plane where the backrest 1011 and the headrest 102 are in contact. Two speakers 103 are provided inside the left and right sides of this slice S1. One speaker 103 is relatively close to the user's left ear, and the other speaker 103 is relatively close to the user's right ear. Opposite to slice S1, slice S2 is the slice corresponding to the headrest 102 part. The entire slice S2 is sliced into four sub-slices along the left-to-right direction (i.e., the direction v shown in the figure), namely sub-slice S 21 , sub-slice S 22 , sub-slice S 23 and sub-slice S 24 . Among them, sub-slice S 21 can be considered as the left half slice of slice S2. The internal components of this left half slice are not shown, and specific details can be referred to sub-slices S 22 ~sub-slices S 24 . Sub-slice S 22 can be considered as the part of the headrest main body 1021 cut from the right half slice of slice S2. The driver 107 is provided in this part. Sub-slice S23 It can be considered as the rotating mechanism part cut from the right half slice of slice S2, including the second rotating mechanism 1023b, taking the rotating shaft as an example in the figure. Sub-slice S 24 It can be considered as the flipping part cut from the right half slice of slice S2, in which a microphone 104 is provided.

[0088] Furthermore, optionally, in addition to being provided in the flipping part 1022, the microphone 104 can also be provided in the headrest main body 1021, and the number of microphones 104 in the headrest main body 1021 and any one side flipping part 1022 can be one or more. For example, Figure 6 Taking two groups of microphones (microphone group one 104a and microphone group two 104b) as an example, microphone group one 104a is closer to the user's right ear, and microphone group two 104b is closer to the user's left ear. Each group of microphones can include 4 microphones, two of which are arranged on the upper and lower sides of the edge of the flipping part, and the other two are arranged on the upper and lower sides of the edge of the headrest main body 1021 close to the flipping part. In this way, no matter what height the user is sitting on the seat main body 101, a microphone closer to the user's ear can always be found in each group of microphones, and the noise collected by this microphone can be considered as the noise heard by the user's ear. Using this noise to generate anti-phase noise can improve the noise reduction effect on the user's ear.

[0089] Furthermore, optionally, when the flipping part 1022 rotates to a position close to the user's ear, the distance between the microphone 104 and the user's ear is less than the first distance. Among them, the distance between the microphone 104 and the user's ear can be understood as the distance between the microphone closest to the user's ear among multiple microphones and the user's ear. For example, the microphone closest to the user's right ear is usually the microphone on the upper or lower side of the edge of the first flipping part 1022a, and the microphone closest to the user's left ear is usually the microphone on the upper or lower side of the edge of the second flipping part 1022b. The first distance can be understood as the distance with little difference from the noise heard by the user's ear, and this distance can be determined by those skilled in the art according to experience or obtained through experimental tests. For example, in one example, through experimental tests, it is found that when the distance between the microphone 104 and the user's ear is less than 5 cm, the noise collected by the microphone 104 and the noise heard by the user's ear are not much different. Therefore, the first distance can be set to 5 cm. With this design, both the microphone 104 and the user's ear can be in the stable period of the sound field generated by the external noise source of the vehicle, and the noise collected by the microphone 104 is relatively close to the noise heard by the user's ear, which helps to improve the cancellation effect of the anti-phase noise on the noise heard by the user's ear.

[0090] III. Controller

[0091] Optionally, the controller can be any device capable of implementing control functions. It can be installed in the seat 100 or outside the seat 100. It can be a controller specifically for implementing the noise reduction function or a controller that implements the noise reduction function while also implementing other functions. For example, in a vehicle scenario, in one example, the controller can be a cockpit domain controller or a vehicle control unit (VCU). In this way, the existing controller in the vehicle can be used to implement the seat noise reduction function to improve the utilization rate of in-vehicle devices. Or, in another example, to reduce the working pressure of the cockpit domain controller or VCU, a separate controller can also be set up specifically for performing seat noise reduction. This controller can be installed in the seat body 101 or the headrest 102, or can be independent of the seat 100, and can be connected to the speaker 103 in the backrest 1011, the microphone 104 and the driver 107 in the headrest 102 through wiring.

[0092] For example, taking the case where the controller is installed outside the seat 100 as an example, please refer to Figure 8 , which shows a schematic diagram of the architecture of a control circuit provided by the present application. This control circuit can, for example, belong to the in-vehicle audio system or the in-vehicle active noise reduction system. This architecture includes a controller 300, a seat body 101 and a headrest 102. The seat body 101 includes a backrest 1011, and a speaker 103 is provided inside the backrest 1011. A microphone 104, a driver 107, a rotating mechanism 1023, a headrest body 1021 and a flipping part 1022 are provided in the headrest 102. The controller 300 is respectively connected to the driver 107, the microphone 104 and the speaker 103. The driver 107 is connected to the rotating mechanism 1023, and the rotating mechanism 1023 realizes the rotational connection between the headrest body 1021 and the flipping part 1022. When the control circuit is working, if the controller 300 determines to switch to the first mode, it can control the driver 107 to drive the rotating mechanism 1023 to drive the flipping part 1022 to rotate towards the direction close to the user's ear, and can control the microphone 104 and the speaker 103 to be turned on to start the active noise reduction in the first mode.

[0093] Further, optionally, when to switch to the first mode can be indicated by the user or determined by the controller 300. For example, when the first mode is the immersive sound playback mode, the user can send an instruction to the controller 300 before playing the audio and video, so that the controller 300 controls the microphone 104 and the speaker 103 to turn on according to the instruction, or the controller 300 can detect that the user is watching the audio and video (such as watching the mobile phone screen for a long time in the horizontal screen state) in conjunction with the camera and other devices, and automatically controls the microphone 104 and the speaker 103 to turn on. For another example, when the first mode is the rest mode, the user can send an instruction to the controller 300 before resting, so that the controller 300 can control the microphone 104 and the speaker 103 to turn on according to the instruction, or the controller 300 can detect that the user is lying on the seat for a long time in conjunction with the camera and other devices, and automatically controls the microphone 104 and the speaker 103 to turn on. Among them, there are many ways for the user to send instructions to the controller, such as voice instructions, button instructions, display input instructions or gesture instructions, etc., which are not specifically limited.

[0094] For example, the first mode is the rest mode and the controller 300 determines when to switch to the rest mode. Figure 9 , showing an interactive flow diagram of a control method provided by the present application, the method is applicable to the aforementioned controller 300, driver 107, microphone 104 and speaker 103. Figure 8 , Figure 9 , Figure 6 , Figure 3 and Figure 5 , the method comprises the following steps:

[0095] In step 901 , the controller 300 detects the user's posture relative to the seat 100 .

[0096] Optionally, after the seat 100 is turned on or powered on, it is in a non-resting mode (i.e., the second mode) by default. In the non-resting mode, the microphone 104 does not work, and the speaker 103 may or may not work. For example, in a scenario where the speaker 103 is only used for noise reduction, the speaker 103 does not work. In a scenario where the speaker 103 is used to perform other functions in addition to noise reduction, the speaker 103 works, and the other functions may be, for example, immersive sound playback, navigation playback, or real-time traffic reminders.

[0097] Further, optionally, after the seat 100 is powered on or turned on, if the controller 300 determines that the current trigger condition is met, it can start a periodic noise reduction control strategy. In each period, the controller detects the posture of the user sitting on the seat 100 relative to the seat 100. Among them, the period duration of each period can be set by those skilled in the art according to experience. For example, it can be set to 5 minutes (min). The trigger condition can be configured according to the specific application scenario. For example, in one example, considering that only when the vehicle speed is relatively high, the wind noise outside the vehicle and the tire friction noise will generate relatively large low-frequency noise inside the vehicle. Therefore, the trigger condition can be configured as the vehicle speed being higher than a preset vehicle speed. The preset vehicle speed can be, for example, 10 kilometers per hour (km / h). Another example, to ensure that the user can have a good noise reduction experience throughout the journey, the trigger condition can also be configured as the seat 100 being powered on or turned on. In other words, after the controller 300 determines that the seat 100 is powered on or turned on, it starts to detect the posture of the user. As long as it is determined that the user is in the rest mode, the active noise reduction can be turned on. Another example, in yet another example, the trigger condition can also be configured as receiving a user instruction. The controller 300 only starts periodic detection when it receives a user instruction to turn on the noise reduction control strategy and does not start detection when it does not receive a user instruction to meet the different noise reduction control requirements of different users. And so on, which will not be listed one by one here.

[0098] Further, optionally, the posture of the user relative to the seat 100 may include the user lying on the seat 100 and the user not lying on the seat 100. There are many ways for the controller 300 to detect the posture of the user relative to the seat 100. For example:

[0099] Posture detection method 1

[0100] Please refer to Figure 10a , which shows a schematic structural diagram of another seat provided by the present application. This seat takes Figure 3 the seat shown as an example. Figure 10a In (A) shows the front view of the seat. Figure 10a In (B) shows the second mode diagram of the seat. Figure 10a In (C) shows the first mode diagram of the seat. As Figure 10aAs shown, in this example, in addition to the various components described above, the seat 100 may further include a pressure detection unit 105. The pressure detection unit 105 may be provided only on the headrest main body 1021 (i.e., the first pressure detection unit 105a), or may be provided both on the headrest main body 1021 and on the backrest 1011 (i.e., the second pressure detection unit 105b). Among them, the pressure detection unit 105 may be any device capable of detecting a pressure value. For example, in one example, it may be a pressure sensor, and a plurality of pressure sensors may be included. The plurality of pressure sensors are evenly distributed on the main stress areas of the headrest main body 1021, the backrest 1011, or both. For another example, in another example, the pressure detection unit 105 may be a pressure sensing film, which is directly attached to the main stress areas of the headrest main body 1021, the backrest 1011, or both, and can be used to detect the pressure of the user on the pressure sensing film. For yet another example, in still another example, a soft material capable of sensing pressure may be directly used to make the seat skin. For example, a textile capable of sensing pressure is used to make the seat skin. The seat skin is covered on the outer sides of the backrest 1011 and the headrest 102 to form the appearance surface of the seat 100, and can be directly used to detect the pressure of the area where the user contacts the seat skin.

[0101] Further, optionally, taking the example of being provided on the headrest main body 1021 and the backrest 1011, both the first pressure detection unit 105a and the second pressure detection unit 105b can be connected to a controller 300 (not shown in the figure). The first pressure detection unit 105a can detect the first pressure borne on the headrest main body 1021 in real time and send it to the controller 300. The second pressure detection unit 105b can detect the second pressure borne on the backrest 1011 in real time and send it to the controller 300. When the controller 300 determines that the first pressure is greater than the first pressure threshold and the second pressure is greater than the second pressure threshold based on the first pressure and the second pressure received at the same moment, it can determine that the user is lying on the seat 100 at the current moment. Among them, the first pressure threshold is used to indicate the critical pressure value when the user's head leans on the headrest main body 1021, and the second pressure threshold is used to indicate the critical pressure value when the user's back leans on the backrest 1011. The first pressure threshold and the second pressure threshold can be obtained, for example, through experimental tests.

[0102] Adopting the first posture detection method, the controller can determine whether the user is lying on the seat by analyzing the pressure of the user's head on the headrest main body, or further including the pressure of the user's back on the backrest. The acquisition frequency of the pressure detection unit is usually high and the real-time performance is good. Therefore, this detection method can timely determine the posture of the user at each moment. In addition, by combining the pressures on both the head and the back to comprehensively determine whether the user is lying on the seat, it can also avoid misjudgment caused by only analyzing the head pressure, which helps to improve the accuracy of detecting the user's posture.

[0103] Posture detection method 2

[0104] Please refer to Figure 10b , which shows a schematic diagram of a device using a seat provided by this application. The seat takes the seat shown in Figure 5 as an example. In combination with Figure 10b and Figure 6 , in this example, a camera module 400 may also be provided in front of the seat 100. The camera module 400 can be connected to the controller 300 and is used to periodically (the period duration is much smaller than the period duration of the control strategy, for example, it can be 5 s (seconds)) capture images of the user sitting on the seat 100 and send the images to the controller 300. The controller 300 detects the images received at each moment, determines the distance between the user's head in the image and the headrest main body 1021 of the seat 100. When the distance is less than the distance threshold, it can be determined that the user is leaning on the headrest main body 1021 at the current moment, and then it can be considered that the user is lying on the seat 100. Among them, the distance threshold is used to indicate the critical distance value when the user's head leans on the headrest main body 1021. Ideally, it is 0, but considering the error influence, it can also be set to a value close to 0, such as 1 cm.

[0105] Optionally, the aforementioned camera module 400 can be, for example, a depth camera. The depth camera can capture the first depth information between the user's head and the camera module 400 and the second depth information between the headrest main body 1021 and the camera module 400. The controller 300 can obtain the first distance between the user's head and the camera module 400 and the second distance between the headrest main body 1021 and the camera module 400 by performing algorithm recognition on the first depth information and the second depth information, and then can use the difference between the second distance and the first distance as the distance between the user's head and the headrest main body 1021. Or, in some scenarios, the controller 300 can also obtain the corresponding relationship between multiple preset positions and multiple second distances. The multiple positions refer to any position during the forward and backward movement of the seat 100. The second distance corresponding to this position refers to the distance between the headrest main body 1021 and the camera module 400 when the seat 100 is in this position. The corresponding relationship between the multiple positions and the multiple second distances can be measured after the seat 100 and the camera module 400 are assembled and can be stored in the controller 300 or other components in the device, such as a memory.

[0106] It can be understood that the camera module 400 can also be other types of cameras. For example, it can also be a binocular camera. By calculating the image parallax collected by the binoculars, the distance from the binocular camera to the user's head can also be estimated. Or, it can also be an ordinary camera. The ordinary camera can be installed above the seat. By capturing images of the user sitting on the seat 100 from above, the distance between the user's head and the headrest main body 1021 can be directly recognized from the images. In addition, Figure 10bTaking the example that the camera module 400 is placed directly in front of the seat 100, the camera module 400 can also be placed at other positions of the seat 100, such as the front left, front right, upper front or lower front positions, etc. The present application does not limit this.

[0107] By adopting the second attitude detection method, the controller can determine whether the user's head is leaning on the headrest main body by analyzing the distance between the user's head and the headrest main body, and then can determine whether the user is lying on the seat. The distance detection is more intuitive than the pressure detection and can make the attitude detection more accurate.

[0108] It should be noted that the above are only two exemplary attitude detection methods. In actual scenarios, other methods can also be used to detect the user's attitude. For example, in another example, deformation detection sensors can also be installed on the headrest main body 1021 and the backrest 1011 of the seat 100, and whether the user is lying on the seat 100 can be detected by collecting the deformation amounts of the headrest main body 1021 and the backrest 1011. Or, in still another example, a radar can also be set in front of one or more surfaces of the seat 100. The radar can be a lidar or an ultrasonic radar, etc. The radar can detect the distance between the user and the radar to determine whether the user is lying on the seat 100. And so on, which will not be listed one by one here.

[0109] Step 902, the controller 300 determines whether the user's head is stably leaning on the headrest main body 1021 according to the user's attitude relative to the seat 100. If so, step 903 is executed; if not, step 910 is executed.

[0110] Optionally, after each cycle starts, the controller 300 can obtain the attitude change of the user relative to the seat 100 within a set duration. If the user is always lying on the seat 100 within the set duration, it can be determined that the user's head is stably leaning on the headrest main body 1021; otherwise, it is determined that the user's head is not stably leaning on the headrest main body 1021. The set duration can be a duration less than the cycle duration, for example, it can be 1 min.

[0111] Taking 1 minute as an example, when detecting the user's posture using posture detection method 1, if the controller 300 determines that the pressure collected by the pressure detection unit 105 within 1 minute is always greater than the pressure threshold, it indicates that the headrest main body 1021 (or also including the backrest 1011) has been subjected to a relatively large pressure within this 1 minute. Furthermore, it indicates that the user's head has always been closely against the headrest main body 1021 (or also including the user's back has always been closely against the backrest 1011). In this case, the controller 300 can determine that the user's head is stably against the headrest main body 1021. Conversely, if it is determined that at least one of the pressures collected by the pressure detection unit 105 within 1 minute is not greater than the pressure threshold, it indicates that the user's head may occasionally, frequently, or always leave the headrest main body 1021 (or also indicates that the user's back occasionally, frequently, or always leaves the backrest 1011). In this case, the controller 300 can determine that the user's head is not stably against the headrest main body 1021.

[0112] Similarly, when detecting the user's posture using posture detection method 2, if the controller 300 determines that the distance between the user's head and the headrest main body 1021 is always not greater than the distance threshold within 1 minute, it indicates that the user's head has been against the headrest main body 1021 within this 1 minute. In this case, the controller 300 can determine that the user's head is stably against the headrest main body 1021. Conversely, if it is determined that at least one of the distances between the user's head and the headrest main body 1021 within 1 minute is greater than the distance threshold, it indicates that the user's head may occasionally, frequently, or always leave the headrest main body 1021. In this case, the controller 300 can determine that the user's head is not stably against the headrest main body 1021.

[0113] Step 903, the controller determines whether it is currently in the first mode. If not, it executes step 904. If so, it executes step 901.

[0114] It can be understood that when the user's head is stably against the headrest main body 1021, it indicates that the user may be resting, sleeping, or in other scenarios where the head needs to be stably against the headrest. It is necessary to switch to the rest mode (i.e., the first mode). At this time, if the current mode is not the rest mode, the controller 300 can adjust the current mode to the rest mode. Conversely, if the current mode is already the rest mode, no adjustment is required. The controller 300 can wait until the end of the current cycle and then start the noise reduction control strategy for the next cycle.

[0115] Optionally, after determining to adjust the current mode to the rest mode and before performing specific adjustment operations, the controller 300 may first send a first prompt message to the user. The first prompt message is used to prompt the user whether to turn on the rest mode. The first prompt message can be sent in various ways. For example, it can be sent by voice, such as directly emitting a prompt sound through the speaker 103; or it can be sent by display, such as popping up a prompt box through a display screen in front of or near the seat. The display screen can be, for example, a car machine display screen or a rear seat display screen, or any other displayable screen; or it can be sent jointly by voice and display to ensure that the user can receive the prompt in case the user fails to notice one of them. When the prompt is sent by voice, the user can indicate by voice to turn on the rest mode or not to turn on the rest mode, and this indication information will be collected by the in-vehicle voice module and sent to the controller 300. When the prompt is sent by display, the user can select to turn on the rest mode or not to turn on the rest mode in the prompt box popped up on the screen, and this indication information will be collected by the car machine and sent to the controller 300. If the controller 300 receives an indication to turn on the rest mode, it can make the microphone 104 close to the user's ear by performing the following steps 904 and 905, and turn on the active noise reduction function by performing the following steps 906 to 909. Conversely, if it receives an indication not to turn on the rest mode, the controller 300 can wait until the end of the current cycle and then start the noise reduction control strategy for the next cycle.

[0116] Step 904, the controller sends a first indication message to the driver 107.

[0117] Step 905, the driver 107 drives the rotating mechanism 1023 to drive the flipping part 1022 to rotate to a position close to the user's ear according to the first indication message.

[0118] Combined together Figure 6 and Figure 3 or Figure 6 and Figure 5 , in the non-rest mode, the first flipping part 1022a, the second flipping part 1022b and the headrest main body 1021 are presented as Figure 3 in (B) of Figure 5 shown in (B) of Figure 3 in (C) of Figure 5As shown in (C). In this position, the first flipping part 1022a, the second flipping part 1022b and the headrest main body 1021 form a relatively narrow space that can be used to accommodate the user's head. The distance between the microphone 104 and the user's ear is not greater than the first distance, and the first distance can be set to 5 cm, for example. Additionally, during the rotation of the first flipping part 1022a and the second flipping part 1022b, the distance between the speaker 103 and the user's ear remains unchanged, and this distance is within the first set range, which can be set to [10 cm, 30 cm], for example.

[0119] Step 906, the controller controls the microphone 104 and the speaker 103 to turn on.

[0120] It can be understood that when the speaker 103 is also turned on in the non-rest mode, the controller 300 can only turn on the microphone 104.

[0121] Step 907, the controller obtains the noise collected by the microphone 104.

[0122] Step 908, the controller generates anti-phase noise based on the noise collected by the microphone 104 and sends it to the speaker 103.

[0123] Step 909, the speaker 103 plays the anti-phase noise.

[0124] Optionally, in combination with Figure 6 and Figure 3 or Figure 6 and Figure 5, in the rest mode, the controller 300 can control the operation of the first microphone group 104a, the second microphone group 104b, the first speaker 103a, and the second speaker 103b. Each microphone in the first microphone group 104a and the second microphone group 104b collects the noise at its location during operation and sends it to the controller 300. The controller 300 can calculate the first anti-phase noise and the second anti-phase noise through an internal algorithm based on the noise collected by each microphone in the first microphone group 104a and the second microphone group 104b, send the first anti-phase noise to the first speaker 103a, and send the second anti-phase noise to the second speaker 103b. The first speaker 103a plays the first anti-phase noise in the working state, and the second speaker 103b plays the second anti-phase noise in the working state. After the first anti-phase noise played by the first speaker 103a and the second anti-phase noise played by the second speaker 103b are propagated to the position of the user's right ear, they are superimposed to jointly reduce the noise of the user's right ear. After the second anti-phase noise played by the second speaker 103b and the first anti-phase noise played by the first speaker 103a are propagated to the position of the user's left ear, they are superimposed to jointly reduce the noise of the user's left ear. By jointly using two speakers to reduce the noise of each ear of the user, the noise heard by both ears can be effectively suppressed, and the effect of reducing the noise of the user's ears can be improved.

[0125] Furthermore, optionally, taking the first microphone group 104a as an example, the controller 300 can determine the first anti-phase noise in various ways. For example, in one example, the controller 300 can first combine devices such as a camera to detect the microphone in the first microphone group 104a that is closest to the user's right ear, and then flip the phase of the noise collected by this microphone by 180 degrees as the first anti-phase noise. For another example, in another example, the controller 300 can first average or weighted-average the noise collected by all the microphones in the first microphone group 104a, and then flip the phase of the average noise or weighted-average noise by 180 degrees as the first anti-phase noise. Among them, the weights corresponding to each microphone can be determined according to its distance from the user's right ear. When the distance is smaller, the weight can be set larger. For another example, in still another example, the controller 300 can also obtain the intermediate noise of all the noise collected by all the microphones in the first microphone group 104a, and then flip the phase of this intermediate noise by 180 degrees as the first anti-phase noise. And so on. They are not listed one by one here.

[0126] In the above steps 904 to 909, by switching the user to the rest mode while the user's head is stably resting on the headrest body and actively reducing noise for the user, the comfort of the user during rest or sleep can be improved. Additionally, when switching to the rest mode, the microphone 104 is driven by the flipping part 1022 to rotate to a position relatively close to the user's ear, such that the difference between the primary sound field at the user's ear and the microphone 104 is small. At the same time, the distance between the user's ear and the microphone 104 is similar to the distance between the user's ear and the speaker 103. Therefore, the difference between the secondary sound field of the user's ear and the microphone 104 is also small. Consequently, the noise collected by the microphone can be relatively close to the noise heard by the user's ear, and the anti-phase noise corresponding to this noise can effectively cancel out the noise heard at the user's ear, thereby achieving better noise reduction performance at the human ear to obtain a more quiet riding experience. Also, during the rotation of the microphone 104, the distance between the speaker 103 and the user's ear remains unchanged, and this distance is relatively far compared to the distance between the microphone 104 and the user's ear. In this way, even if the user's head moves slightly during rest or sleep, the sound played by the speaker 103 heard by the user's ear will not change significantly, and thus a stable noise reduction experience can still be provided for the user's ear during rest or sleep.

[0127] Step 910, the controller determines whether the current mode is the second mode. If not, step 911 is executed; if so, step 901 is executed.

[0128] It can be understood that when the user's head is not stably resting on the headrest body 1021, it indicates that the user is not resting or sleeping, and the user may need a relatively large head movement space, so it is necessary to switch to the non-rest mode. At this time, if the current mode is not the non-rest mode, the controller 300 can adjust the current mode to the non-rest mode. Conversely, if the current mode is already the non-rest mode, no adjustment is required, and the controller 300 can wait for the end of the current cycle and then start the noise reduction control strategy for the next cycle.

[0129] Optionally, after determining to adjust the current mode to a non-rest mode and before performing specific adjustment operations, the controller 300 may first send a second prompt message to the user, which is used to prompt the user whether to turn off the rest mode. The second prompt message can be sent in various ways. For example, it can be sent by voice, such as directly emitting a prompt sound through the speaker 103; or it can be sent by display, such as popping up a prompt box through a display screen in front of or near the seat. The display screen can be, for example, a vehicle head unit display screen or a rear seat display screen, or any other screen that can display. Or it can be sent by combining voice and display together, so as to ensure that the user can receive the prompt in case the user fails to notice one of them. When the prompt is sent by voice, the user can indicate by voice to turn off the rest mode or not to turn it off, and this indication information will be collected by the in-vehicle voice module and sent to the controller 300. When the prompt is sent by display, the user can select to turn off the rest mode or not to turn it off in the prompt box popped up on the screen, and this indication information will be collected by the vehicle head unit and sent to the controller 300. If the controller 300 receives an indication to turn off the rest mode, it can move the flipping part 1022 away from the user's ear by performing the following steps 911 and 912, and can turn off the active noise reduction function or reduce the noise reduction level of the active noise reduction function by performing the following step 913. Conversely, if it receives an indication not to turn off the rest mode, the controller 300 can wait until the end of the current cycle and then start the noise reduction control strategy for the next cycle.

[0130] Step 911, the controller sends a second indication message to the driver 107.

[0131] Step 912, the driver 107 drives the rotating mechanism 1023 to drive the flipping part 1022 to rotate to a position away from the user's ear according to the second indication message.

[0132] Combined together Figure 6 and Figure 3 or Figure 6 and Figure 5 , in the rest mode, the first flipping part 1022a, the second flipping part 1022b and the headrest main body 1021 are presented as Figure 3 in (C) or Figure 5 as shown in (C), the driver 107 can control the first rotating mechanism 1023a and the second rotating mechanism 1023b to drive the first flipping part 1022a and the second flipping part 1022b to rotate away from each other in the -X direction according to the second indication message, so that the first flipping part 1022a and the second flipping part 1022b gradually move away from the user's ear and finally stop at the position where the first flipping part 1022a and the second flipping part 1022b are unfolded. In this position, the first flipping part 1022a, the second flipping part 1022b and the headrest main body 1021 are located on the same arc surface, such as Figure 3in (B) or Figure 5 As shown in (B). Since the two flipping parts are unfolded, the user's head can have a relatively large range of movement, facilitating the free movement of the user's head in a non-resting state.

[0133] Step 913, the controller 300 controls the microphone 104 to turn off, or reduces the noise reduction level of the speaker 103 playing anti-phase noise for noise reduction.

[0134] Optionally, in the non-resting mode, if the speaker 103 is used not only for active noise reduction but also for implementing other functions (such as emitting the first prompt message, immersive sound playback, navigation playback, or traffic reminder as described in the foregoing step 904), the controller 300 can only control the microphone 104 to turn off while keeping the speaker 103 on. On the contrary, if the speaker 103 is only used for active noise reduction, the controller 300 can control both the microphone 104 and the speaker 103 to turn off, thereby turning off the active noise reduction function, or can also only control the speaker 103 to reduce the level of playing anti-phase noise for noise reduction, and neither the microphone 104 nor the speaker 103 is turned off. Among them, the level of the speaker 103 playing anti-phase noise for noise reduction is related to the upper frequency limit of the anti-phase noise played by the speaker 103. The smaller the upper frequency limit of the anti-phase noise, the larger the wavelength of the anti-phase noise, the larger the effective noise reduction area, but the less environmental noise that can be cancelled out, and the lower the noise reduction level. Therefore, when switching from the resting mode to the non-resting mode, the controller 300 can reduce the upper frequency limit of the anti-phase noise played by the speaker 103. For example, the upper frequency limit in the resting mode is 1000 Hz, and it can be lowered to 500 Hz in the non-resting mode. In this way, even if the distance from the user's ear to the speaker 103 becomes farther due to the movement of the user's head in the non-resting mode, the user's ear can still hear the anti-phase noise played by the speaker 103. At the same time, since the upper frequency limit of the anti-phase noise is reduced, compared with the resting mode, the anti-phase noise has no noise reduction effect on the noise in the frequency bands with the reduced upper frequency limit (i.e., 500 Hz - 1000 Hz), so that the noise reduction level of the anti-phase noise becomes smaller.

[0135] Further, optionally, multiple noise reduction modes can be pre-configured. After the controller 300 issues the second prompt message in the foregoing step 911, if it receives an instruction from the user to turn off the rest mode, it can also prompt the user to select a noise reduction mode. Among them, the multiple noise reduction modes can include, for example, a deep noise reduction mode, a medium noise reduction mode, a light noise reduction mode, and a no noise reduction mode. The noise reduction degrees corresponding to these four noise reduction modes gradually decrease. For example, the upper frequency limit of the inverted noise played by the speaker 103 corresponding to the deep noise reduction mode is 1000 Hz, the upper frequency limit of the inverted noise played by the speaker 103 corresponding to the medium noise reduction mode is 500 Hz, the upper frequency limit of the inverted noise played by the speaker 103 corresponding to the light noise reduction mode is 200 Hz, and the upper frequency limit of the inverted noise played by the speaker 103 corresponding to the no noise reduction mode is 0 Hz. In this way, after the controller 300 receives the selected noise reduction mode from the user, if the user selects one of the deep noise reduction mode, the medium noise reduction mode, and the light noise reduction mode, it can adjust the upper frequency limit of the inverted noise played by the speaker 103 to the upper frequency limit corresponding to the selected noise reduction mode, and neither the microphone 104 nor the speaker 103 is turned off. If the user selects the no noise reduction mode, it can control the microphone 104 to turn off, and the speaker 103 can be turned off or not. Turning off the speaker 103 can save power, but when the speaker 103 is not turned off and can be used to implement other functions, the utilization rate of the speaker 103 can be improved.

[0136] Based on the structure and functions of the seat described above, the present application can also provide a vehicle, including the foregoing seat and controller, such as Figure 8 the shown seat 100 and controller 300. During the driving of the vehicle, the controller is used to control the seat to be in the first mode when it detects that the user's head is stably resting on the headrest. Optionally, the controller can also be used to control the seat to be in the second mode when it detects that the user's head is not stably resting on the headrest. For the relevant content of the controller and the seat, please directly refer to the relevant introductions in the foregoing Figure 8 and Figure 9 and will not be repeated here.

[0137] The foregoing vehicle can include, for example, but not limited to: cars, trucks, buses, ships, airplanes, helicopters, recreational vehicles, amusement park vehicles, construction vehicles, trams, golf carts, trains, driverless vehicles, smart vehicles, and digital cars, etc.

[0138] In this application, "at least one" means one or more, and "a plurality" means two or more. The expression "there is at least one (item)" or its similar expressions means any combination of these items, including any combination of a single item or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or plural. Additionally, in this application, the term "exemplarily" or "optionally" is used to give examples, illustrations, or explanations. Any embodiment or design described as "exemplary" or "optional" in this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Or it can be understood that the use of the term "exemplary" or "optional" is intended to present concepts in a specific manner and does not constitute a limitation to this application.

[0139] It can be understood that the various numerical numbers involved in this application are only for the convenience of description and are not used to limit the scope of the embodiments of this application. The magnitudes of the serial numbers of the above processes do not mean the sequence of execution is prior or subsequent, and the execution sequence of each process should be determined by its function and internal logic. Terms such as "first", "second", and other similar expressions are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. In addition, the terms "comprising" and "having" and any of their variations are intended to cover non-exclusive inclusion. For example, a method, system, product, or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

Claims

1. A seat, characterized in that, It includes a seat body and a headrest. The headrest is fixed to the seat body, and a microphone is provided inside the headrest. The seat body includes a backrest, and a speaker is provided inside the backrest. In the first mode, the microphone is used to collect noise, and the speaker is used to play the anti-phase noise of the noise.

2. The seat according to claim 1, characterized in that, In the second mode, the microphone does not work, or the microphone works, but the noise reduction degree of the speaker playing the anti-phase noise for noise reduction is lower than the noise reduction degree corresponding to the first mode.

3. The seat according to claim 1 or 2, characterized in that, The first mode is the rest mode.

4. The seat according to any one of claims 1 to 3, characterized in that The headrest floats in front of the backrest, and the speaker is arranged in the area of the backrest that coincides with the headrest.

5. The seat according to any one of claims 1 to 3, characterized in that The headrest is connected to the upper part of the backrest by a connecting rod, and the speaker is arranged in the area of the backrest opposite to the headrest.

6. The seat according to any one of claims 1 to 5, characterized in that, The headrest includes a headrest main body and flipping parts swingably arranged on both sides of the headrest main body. The headrest main body is fixed to the backrest, and the microphone is arranged on the flipping parts. In the first mode, the flipping parts are in a position close to the human ears.

7. The seat according to claim 6, characterized in that, In the second mode, the flipping parts are in a position far from the human ears.

8. The seat according to claim 7, characterized in that, The flipping parts are connected to the headrest main body by a rotating mechanism, and a driver is arranged inside the headrest main body. The driver is connected to the rotating mechanism. The driver is used to drive the rotating mechanism to drive the flipping parts to rotate to a position close to the human ears when determining the switch from the second mode to the first mode, and to drive the rotating mechanism to drive the flipping parts to rotate to a position far from the human ears when determining the switch from the first mode to the second mode.

9. The seat according to claim 8, wherein, The driver is connected to a controller. The controller is used to send a first instruction message to the driver when determining that the user's head is stably leaning on the headrest main body and is currently in the second mode, and to send a second instruction message to the driver when determining that the user's head is not stably leaning on the headrest main body and is currently in the first mode. The driver is used to determine the switch from the second mode to the first mode according to the first instruction message, and to determine the switch from the first mode to the second mode according to the second instruction message.

10. The seat according to claim 9, characterized in that, A pressure detection unit is provided on the headrest main body, or pressure detection units are provided on both the headrest main body and the backrest. The pressure detection unit is connected to the controller. The pressure detection unit is used to detect the pressure of the headrest main body or the headrest main body and the backrest, and send it to the controller. The controller is used to determine that the user's head is stably leaning on the headrest main body if the pressure within a set time period is greater than the pressure threshold, otherwise determine that the user's head is not stably leaning on the headrest main body.

11. The seat according to claim 9, characterized in that, A camera module is provided in front of the seat. The camera module is connected to the controller. The camera module is used to capture an image of the seat and send it to the controller. The controller is configured to determine the distance between the user's head and the headrest body of the seat based on the image. When the distances within a set duration are all greater than a distance threshold, it is determined that the user's head is stably resting on the headrest body; otherwise, it is determined that the user's head is not stably resting on the headrest body.

12. The seat according to any one of claims 9 to 11, characterized in that, Before sending the first indication information or the second indication information to the driver, the controller is further configured to: Send a prompt message to the user, where the prompt message is used to prompt the user whether to turn on the first mode or the second mode.

13. The seat according to any one of claims 9 to 12, characterized in that, After sending the first indication information to the driver, the controller is further configured to: Turn on the microphone and the speaker.

14. The seat according to any one of claims 9 to 13, characterized in that, After sending the second indication information to the driver, the controller is further configured to: Turn off the microphone, or reduce the noise reduction level of the speaker playing anti-phase noise for noise reduction.

15. A vehicle, characterized in that, Comprising a controller and a seat as described in any one of claims 1 to 14; The controller is configured to control the seat to be in the first mode when it detects that the user's head is stably resting on the headrest.

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