Seat and transportation means

Abstract

A seat and a transportation means, relating to the technical field of noise control, and for use in providing stable noise cancellation experience for a user. The seat comprises a seat main body and a headrest, the headrest is fixed to the seat main body, a microphone is provided in the headrest, the seat main body comprises a backrest, a loudspeaker is provided in the backrest, and in a first mode, the microphone is used for collecting noise, and the loudspeaker is used for playing back phase-inverted noise of the noise. The microphone is arranged in the headrest close to the ears of the user, so that the noise collected by the microphone is close to the noise heard by the ears of the user, the better noise cancellation performance at the ears of the user is realized, and the user can obtain quieter seating experience. In addition, the loudspeaker is arranged in the backrest farther away from the ears of the user, and even if the head of the user moves slightly, the phase-inverted noise played back by the loudspeaker and heard by the ears of the user does not change too much, so that the user can obtain more stable noise cancellation experience.

Description

Seat and transportation vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on December 15, 2023, with application number 202311735291.4 and application name "A Chair and a Vehicle", all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of noise control, and in particular to a seat and a vehicle. Background Art

[0004] While a car is in motion, friction between the airflow and the car body, friction between the tires and the road, and engine noise can generate significant low-frequency noise inside the vehicle, directly impacting passenger comfort and well-being. To effectively suppress low-frequency noise inside vehicles, numerous studies have focused on active noise cancellation (ANC) technology. The basic principle of ANC technology is to generate an anti-phase noise equal to the external noise, thereby canceling it out and achieving the desired effect. ANC technology has a good control effect on low-frequency noise and is expected to become a key solution for in-vehicle noise control in the future.

[0005] Currently, ANC technology is often integrated with in-car seats to create noise-canceling seats. However, the noise reduction effect of existing mainstream noise-canceling seats is not very good. Even the slightest movement of the passenger's head can cause a significant difference in noise reduction performance, failing to provide a stable noise reduction experience for passengers, and thus having a limited effect on improving passenger comfort.

[0006] In summary, how to provide passengers with a stable noise reduction experience is a technical problem that urgently needs to be solved in the field of in-vehicle noise control. Summary of the Invention

[0007] The present application provides a seat and a vehicle for providing passengers with a stable noise reduction experience.

[0008] In a first aspect, the present application provides a seat comprising a seat body and a headrest, wherein the headrest is fixed to the seat body and a microphone is provided in the headrest, and the seat body comprises a backrest and a speaker is provided in the backrest. In a first mode, the microphone is used to collect noise and the speaker is used to play an inverse phase noise of the noise.

[0009] In the above solution, the headrest is closer to the user's head than the backrest. Therefore, the microphone is placed on the headrest and the speaker on the backrest, making the distance between the microphone and the user's head relatively close, while the distance between the speaker and the user's head is relatively far. This close distance between the microphone and the user's ear makes the noise collected by the microphone closer to the noise heard by the user's ear. The corresponding anti-phase noise of this noise effectively cancels the noise heard at the user's ear, achieving better noise reduction performance at the user's ear and providing a quieter riding experience. Since the speaker is relatively far away from the user's ear, due to the characteristic that the sound intensity of the sound field decreases with increasing distance, even with relatively small movements of the user's head, the sound played by the speaker at the user's ear will not change significantly, thus helping to provide the user with a stable noise reduction experience. As can be seen, the above solution can achieve both good noise reduction and a stable noise reduction experience, effectively improving user riding comfort.

[0010] Optionally, the first mode is a mode that requires greater noise reduction, such as a rest mode or an immersive sound playback mode. By actively reducing noise in the first mode, a relatively quiet environment can be provided for the user to rest, sleep, or watch videos, etc., meeting the user's noise reduction needs.

[0011] Optionally, in the second mode, the microphone is not operational, or the microphone is operational but the speaker plays reverse-phase noise to achieve a lower level of noise reduction than in the first mode. The second mode can be understood as a mode with low noise reduction requirements, such as any mode other than rest mode and immersive sound playback mode.

[0012] Furthermore, optionally, in the second mode, both the microphone and the speaker may be inoperative. In this case, noise reduction is not performed in the second mode, and the speaker is used only to implement the active noise reduction function in the first mode. Alternatively, in the second mode, the microphone is inoperative, but the speaker is operative, but the content played by the speaker is different from that played in the first mode. In this case, noise reduction is not performed in the second mode, and the speaker can be used to perform other functions in addition to the active noise reduction function in the first mode, such as playing road warning information. Alternatively, in the second mode, both the microphone and the speaker are operative, but the degree of noise reduction achieved by the speaker playing reversed-phase noise is lower than that achieved in the first mode. For example, the upper frequency limit of the reversed-phase noise played by the speaker in the second mode is lower than that played in the first mode. In this case, noise reduction is also performed in the second mode, but the effect is less than that achieved in the first mode. Therefore, the user can still experience a certain degree of noise reduction in the second mode.

[0013] In one possible design, when the backrest covers the headrest at its height, the headrest can float in front of the backrest, and the speakers can be placed in the area of ​​the backrest that overlaps with the headrest, for example, behind the headrest in the unobstructed area of ​​the backrest. This location should be at least 10 cm from the user's ears, minimizing the impact of the speaker's secondary sound field on the user's ears.

[0014] In one possible design, when the backrest's height doesn't cover the headrest, the headrest can be connected to the backrest's upper portion via a connecting rod. The speaker can be located in an area of ​​the backrest opposite the headrest, for example, on the backrest's top surface below the headrest. This location can also maintain a distance of at least 10 cm from the user's ears, minimizing the impact of the speaker's secondary sound field on the user's ears.

[0015] In one possible design, to enhance the backrest's aesthetics, the speaker's diaphragm surface can face the user's head. For example, if the speaker is located on the backrest behind the headrest, where it's not obstructed, the speaker's diaphragm surface can face forward. For another example, if the speaker is located on the top surface of the backrest below the headrest, the speaker's diaphragm surface can face upward.

[0016] In one possible design, the headrest includes a main body and a flip portion that swings on either side of the main body. The main body is fixed to the backrest, and the microphone is located in the flip portion. In a first mode, the flip portion is positioned close to the user's ears. Thus, when switching to the first mode, the flip portion can be rotated, driving the microphone located in the flip portion toward the user's ears, thereby reducing the distance between the microphone and the user's ears and improving the noise reduction effect at the user's ears in the first mode.

[0017] In a further possible design, in the second mode, the flip portion is located away from the ear. Thus, when switching to the second mode, the flip portion can be rotated to move away from the ear, thereby providing the user with more head room in the second mode.

[0018] In one example of the above design, the flip portion is connected to the headrest body via a rotation mechanism. A driver is disposed within the headrest body and connected to the rotation mechanism. The driver is configured to drive the rotation mechanism to rotate the flip portion to a position close to the ear when switching from the second mode to the first mode, and to drive the rotation mechanism to rotate the flip portion away from the ear when switching from the first mode to the second mode. In this manner, the driver can drive the rotation mechanism to rotate, thereby rotating the flip portion, causing the microphone to move away from or toward the user's ear, thereby achieving flexible control of the distance between the microphone and the user's ear in the first or second mode.

[0019] In a further possible example, the driver is connected to the controller, and the controller is used to send a first indication message to the driver when it determines that the user's head is stably resting on the headrest body and is currently in the second mode, and to send a second indication message to the driver when it determines that the user's head is not stably resting on the headrest body and is currently in the first mode; the driver is used to determine to switch from the second mode to the first mode based on the first indication message, and to determine to switch from the first mode to the second mode based on the second indication message.

[0020] Through the above example, when the controller determines that the user is resting, sleeping, or in another situation where their head is resting steadily on the headrest, the controller can control the rotation mechanism through the driver to rotate the flip portion, bringing the microphone closer to the user's ear. This improves the accuracy of the microphone's noise collection and provides a quieter environment for the user. Conversely, when the controller determines that the user is not resting, sleeping, or in another situation where their head is not resting steadily on the headrest, the driver can control the rotation mechanism to rotate the flip portion, moving it away from the user's ear, providing the user with more head room and facilitating head movement.

[0021] In a further possible example, whether the user's head is stably resting on the headrest body can be determined by the following method 1 or method 2:

[0022] Method 1: A pressure detection unit is provided on the headrest body, or a pressure detection unit is provided on both the headrest 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 body or the headrest body and the backrest, and send it to the controller. The controller is used to determine that if the pressure within a set time period is greater than the pressure 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.

[0023] In the first approach described above, the controller can determine whether the user's head is stably resting against the headrest by analyzing changes in pressure from the user's head against the headrest over a period of time, or by analyzing changes in pressure from the user's back against the backrest. The pressure detection unit typically collects data at a high frequency, resulting in better real-time performance. Therefore, this approach can promptly determine changes in the user's head position relative to the headrest. Furthermore, combining both head and back pressure to comprehensively determine whether the user is stably resting against the headrest avoids misjudgments caused by analyzing only head pressure, thereby improving detection accuracy.

[0024] Method 2: A camera module is provided in front of the seat, which is connected to a controller. The camera module is used to capture an image of the seat and send it to the controller. The controller is used to determine the distance between the user's head and the headrest body of the seat based on the image. When the distance within a set time is greater than the 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.

[0025] In the above-mentioned method 2, the controller can determine whether the user's head is stably resting on the headrest body by analyzing the changes 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.

[0026] In a further possible example, before sending the first instruction information or the second instruction information to the driver, the controller may also send a prompt to the user, prompting the user whether to switch to 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 individual needs of different users can be met.

[0027] In a further possible example, after the controller sends the first instruction information to the driver, the controller may also turn on the microphone and the speaker to enable the microphone and the speaker to work, thereby starting active noise reduction.

[0028] In a further possible example, after sending the second instruction information to the driver, the controller may also turn off the microphone to disable active noise reduction, or may not turn off the microphone but reduce the noise reduction level of the anti-phase noise played by the speaker. For example, by lowering the upper frequency limit of the anti-phase noise played, the noise reduction level of the anti-phase noise played by the speaker can be reduced, thereby expanding the noise reduction area, so that even when the user moves their head farther away from the speaker when not in rest mode, they can still hear the anti-phase noise played by the speaker.

[0029] In a second aspect, the present application provides a vehicle comprising a controller and a seat as described in the first aspect or any one of the designs of the first aspect. The controller is configured to control the seat to a first mode upon detecting that a user's head is stably resting against the headrest. Optionally, the controller is further configured to control the seat to a second mode upon detecting that the user's head is not stably resting against the headrest. For details regarding the controller controlling the seat to achieve mode switching, please refer to the first aspect above and will not be repeated here.

[0030] The implementation and beneficial effects of the above-mentioned first and second aspects will be specifically introduced in the embodiment section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 exemplarily shows a curve diagram of the correlation between sound intensity and propagation distance;

[0032] FIG2 exemplarily shows a schematic diagram of a possible application scenario provided by the present application;

[0033] FIG3 exemplarily shows a structural diagram of a seat provided by the present application;

[0034] FIG4 exemplarily shows a structural diagram of a seat frame provided by the present application;

[0035] FIG5 exemplarily shows a structural diagram of another seat provided by the present application;

[0036] FIG6 exemplarily shows a structural diagram of a headrest provided by the present application;

[0037] FIG7 exemplarily shows a schematic diagram of an assembly structure of a headrest and a backrest provided by the present application;

[0038] FIG8 exemplarily shows a schematic diagram of the architecture of a control circuit provided by the present application;

[0039] FIG9 exemplarily shows a schematic diagram of an interactive process of a control method provided by the present application;

[0040] FIG10a exemplarily shows a structural diagram of another seat provided by the present application;

[0041] FIG10 b exemplarily shows a schematic diagram of a device using a seat provided in the present application.

[0042] Reference numerals:

[0043] 100-seat; 101-seat body; 1011-backrest; 1012-rotating shaft; 1013-seat cushion; 1014-seat basin frame;

[0044] 200 - support member; 102 - headrest; 1021 - headrest body; 1022 - flip portion; 1022a - first flip portion; 1022b - second flip portion;

[0045] 1023 - Rotation mechanism; 1023a - First rotation mechanism; 1023b - Second rotation mechanism; 103 - Speaker; 103a - First speaker;

[0046] 103b - second speaker; 104 - microphone; 104a - microphone group 1; 104b - microphone group 2; 105 - pressure detection unit;

[0047] 105a - first pressure detection unit; 105b - second pressure detection unit; 106 - connecting rod; 107 - driver; 300 - controller. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0049] The following is an explanation of some of the terms used in this application. It should be noted that these explanations are for the purpose of facilitating understanding by those skilled in the art and do not limit the scope of protection claimed in this application.

[0050] 1. ANC Technology

[0051] Typically, ANC technology implementation components include a microphone, a controller, and a speaker. The microphone collects ambient noise at the target point and transmits it to the controller. The controller generates anti-phase noise 180 degrees out of phase with the ambient noise and transmits it to the speaker, which then plays the anti-phase noise. The anti-phase noise has the same spectrum as the ambient noise at the target point, but with opposite phases. Therefore, superimposing the anti-phase noise on the ambient noise at the target point effectively suppresses and eliminates the ambient noise.

[0052] 2. Primary sound field and secondary sound field

[0053] When using ANC technology for noise reduction, the primary sound field can be understood as the original noise at the target point when the speaker is silent, while the secondary sound field can be understood as the sound produced at the target point by the inverted noise emitted by the speaker. The sound field resulting from the superposition of the primary and secondary sound fields is the actual sound at the target point. The closer this actual sound is to zero, the better the noise reduction effect on the ambient noise.

[0054] 3. Inhomogeneity of the sound field

[0055] Both the primary and secondary sound fields exhibit unevenness, primarily due to the energy attenuation of sound during propagation. In other words, as sound propagates, its intensity decreases as the distance traveled increases. For example, taking a point sound source as an example, the relationship between sound intensity and propagation distance can be found in the following formula (1.1):

[0056] Among them, I is the sound intensity of a certain 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 receiving point and the sound source, that is, the propagation distance.

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

[0058] The previous text introduced some of the terms involved in this application. The following text introduces the possible application scenarios of this application.

[0059] In one possible implementation, the seat in the present application can be integrated into a vehicle, which can be, for example, a car, truck, bus, train, recreational vehicle, station wagon, van, amusement park vehicle, construction vehicle, tram, golf cart, sightseeing car, patrol car, smart car and digital car. Please refer to Figure 2, which illustrates a possible application scenario of the present application. In this application scenario, taking the vehicle as a car as an example, one or more seats of the car can be set as the seat in the present application. The seat in the present application can play the inverted noise of the ambient noise in the car for the user, so as to provide a quieter environment for the user sitting in the seat, which can be used to alleviate the discomfort of the user affected by the noise in the car when resting or sleeping, or can also be used to achieve immersive sound playback, such as improving the playback effect of the user's audio and video and improving the user's viewing experience. When the main driver's seat is set as the seat in the present application, the seat can also improve the driver's listening quality of voice information such as navigation reminders or driving reminders by playing inverted noise for the driver, so as to achieve safe and efficient driving.

[0060] It should be understood that the above application scenarios are merely examples, and the chairs provided herein can be used in other possible scenarios, not limited to the examples above. For example, the chairs can be integrated into other modes of transportation, such as subways, high-speed trains, ships, ferries, passenger ships, airplanes, or helicopters, to reduce external low-frequency noise, providing users with a relatively quiet environment and a more comfortable ride. Another example is that the chairs can be used in smart home scenarios, particularly in homes near subway stations, train stations, airports, or construction sites, as an auxiliary means of reducing noise and enhancing the user's smart home experience. Another example is that the chairs can be used in office settings to reduce the impact of typing or talking sounds on users at other workstations, thereby improving their focus. Another example is that the chairs can be used in public areas, such as cinemas, shopping malls, high-speed rail stations, airports, bus stations, hospitals, schools, parks, communities, squares, and churches, to isolate external noise, reduce the ambient noise level around the user, and enable users to relax and feel more comfortable. And so on. This list is not provided here.

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

[0062] As described in the background technology, the noise reduction effect of existing noise reduction seats is not good. This is mainly due to the unreasonable positioning of the microphones or speakers of existing noise reduction seats. For example, in some existing solutions, the microphones and speakers are placed in the seat backs, but the microphones are easily blocked by the user's body in the seat backs, resulting in the noise intensity collected by the microphones being reduced or even no noise being collected. In addition, the seat backs are also far away from the user's ears, so the difference between the noise collected by the microphones and the noise actually heard by the user's ears is also relatively large. Both of these aspects make the accuracy of the noise collected by the microphones worse, making it difficult to ensure the noise reduction effect at the user's ears. For example, experiments have found that when the microphone is 10 cm or more away from the user's ears, 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, in order to improve the noise reduction effect at the user's ears, the microphones need to be placed closer to the user's ears. Based on this, some existing solutions place both the microphone and the speaker in the headrest. While this solution ensures that the microphone is close to the user's ear, the speaker is also close to the user's ear, causing the distance between the user's ear and the speaker to be within the distance range corresponding to the speaker's rapid attenuation period. According to the above explanation of terms, within this distance range, the sound heard by the user's ear from the speaker will change significantly with any movement of the user. This causes the superimposed sound heard by the user's ear to be very unstable, making it difficult to provide a stable noise reduction experience for the user's ear. It can be seen that existing noise reduction seats cannot provide users with a stable noise reduction experience while ensuring the noise reduction effect.

[0063] In view of this, the present application provides a chair, which has a microphone arranged in the headrest and a speaker arranged 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. 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 relatively slightly, the sound played by the speaker heard by the user's ear will not change much, which helps to provide the user with a stable noise reduction experience.

[0064] Based on the above content, the solution provided in the embodiment of the present application is described in detail below in combination with Figures 3 to 10b.

[0065] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

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

[0067] Please refer to Figure 3, which is a structural schematic diagram of a seat provided in this application. Figure 3 (A) shows a front view of the seat, Figure 3 (B) shows a second mode diagram of the seat, and Figure 3 (C) shows a first mode diagram of the seat. As shown in Figure 3, the seat 100 includes a seat body 101 and a headrest 102. The headrest 102 is fixed to the seat body 101. A microphone 104 is provided in the headrest 102. The seat body 101 includes a backrest 1011. A speaker 103 is provided in the backrest 1011. In the first mode, the microphone 104 is used to collect noise and the speaker 103 is used to play the inverse 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, they can be smaller than those in 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. The second mode can be understood as a mode with lower noise reduction requirements, for example, it can be any mode other than the first mode, such as a non-resting mode. The first and second modes 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.

[0068] Optionally, microphone 104 and speaker 103 may be connected to a controller (not shown). The controller is configured to control speaker 103 and microphone 104 to turn on when switching from the second mode to the first mode. Once turned on, microphone 104 periodically collects noise from its location (i.e., the headrest). The controller captures this noise and generates a corresponding inverted noise, which is then transmitted to speaker 103. When turned on, speaker 103 plays this inverted noise. This achieves active noise reduction in the first mode.

[0069] The following describes each component involved in FIG3 to provide an exemplary specific implementation solution.

[0070] 1. Seat body

[0071] Optionally, the seat body 101 may include a seat frame and a cover. The cover is placed over the seat frame to form the exterior of the seat body 101. As the supporting component of the seat body 101, the seat frame must possess sufficient structural strength and rigidity and is typically made of steel, aluminum, magnesium, or a composite material. The cover, also known as the surface or upholstery, comes into direct contact with the user and can be made of a relatively soft material such as leather, artificial leather, fabric, or natural fiber.

[0072] Further, optionally, please refer to FIG4 , which shows a schematic structural diagram of a chair frame provided by the present application. In this example, the chair frame may include a backrest 1011, a rotating shaft 1012, and a seat cushion 1013, and the backrest 1011 and the seat cushion 1013 are rotatably connected via the rotating shaft 1012. When the user sits on the chair 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, so that the user can lean against the backrest 1011 more closely and improve 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] Furthermore, optionally, referring to FIG4 , the seat frame may also include a seat basin frame 1014, to which the seat cushion 1013 is fixed. The seat basin frame 1014 is positioned above the support plate 200 and is slidably connected to the support plate 200. The support plate 200 can be understood as the floor of the space in which the seat 100 is located, such as a vehicle interior floor. The sliding connection between the seat basin frame 1014 and the support plate 200 can be achieved in a variety of ways, such as by providing a slide groove on the support plate 200 (or the seat basin frame 1014), or by providing a guide rail on the seat basin frame 1014 (or the support plate 200). By embedding the guide rail in the slide groove, the seat basin frame 1014 can slide relative to the support plate 200. With this structural design, when a user sits on the seat body 101, the user can also find a seat position that suits their body shape by pushing the seat basin frame 1014 to slide relative to the support plate 200. For example, a fatter user can push the seat pan frame 1014 to a further rearward position, while a thinner user can push it to a further forward position, so that there is space in front of the body that suits their body shape, thereby improving the user's riding comfort.

[0074] The above content introduces the possible structure of the seat body 101. The connection method between the seat body 101 and the headrest 102 will be described below.

[0075] Optionally, the headrest 102 is fixed to the seat body 101. This means that the headrest 102 is fixedly connected to the backrest 1011 in the seat body 101. When 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 fixing method of the headrest 102 and the backrest 1011 is also different, for example:

[0076] In one example (referred to as Example A), see Figure 3 . When the backrest 1011 covers the area where the headrest 102 is located, the headrest 102 can float in front of the backrest 1011 and be fixed to the backrest 1011 or the outer cover via adhesive or other connecting structures. In this way, the backrest 1011 behind the headrest 102 can serve as a load-bearing component for the headrest 102, sharing the pressure of the user's head resting on the headrest 102 and alleviating the pressure on the headrest 102.

[0077] In another example (abbreviated as Example B), please refer to FIG5 , which shows a schematic structural diagram of another type of seat provided by the present application. As shown in FIG5 (A), 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 to the top of the backrest 1011 via the connecting rod 106. In this way, the headrest 102 directly bears the pressure of the user's head resting on the headrest 102, and the connecting rod 106 provides the support force to fix the headrest 102 in the current position. Compared with Example A, the backrest 1011 in Example B can be made shorter, and the combination of the backrest 1011 and the headrest 102 is more flexible and beautiful, and does not look heavy.

[0078] Furthermore, optionally, the speaker 103 is disposed within the backrest 1011, which can be understood as the speaker 103 being disposed on the backrest 1011 within a range near the user's head. The speaker 103 may include one or more speakers, and the distance between each speaker 103 and the user's ear closest to the speaker 103 may be within a first distance range. This first distance range can be understood as a range within which the anti-phase noise played by the speaker 103 can be heard well and the anti-phase noise heard varies little when the user's head moves slightly. This range can be determined by those skilled in the art based on experience or obtained through experimental testing. For example, in one example, experimental testing 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 can hear the anti-phase noise at a relatively appropriate intensity, while also preventing the anti-phase noise from varying significantly due to small movements. Therefore, the first distance range can be set to [10 cm, 30 cm]. This range is within the stable period of the sound field of the anti-phase noise played by the speaker 103, enabling the user's ear to hear relatively stable anti-phase noise, thereby providing a stable noise reduction effect at the user's ear.

[0079] Furthermore, the specific location of the speaker 103 can optionally be set based on the distance between the user and various points on the backrest 1011 after the user sits on the seat 100. For example, when the headrest 102 is suspended in front of the backrest 1011 as shown in FIG3 , the speaker 103 can be located in an area on the backrest 1011 that overlaps with the headrest 102 and is not blocked by the headrest 102. FIG3 uses two speakers (i.e., a first speaker 103a and a second speaker 103b) as an example. The first speaker 103a and the second speaker 103b are located 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 a first distance range, and the distance between the second speaker 103b and the user's left ear is within the first distance range. For another example, when the headrest 102 is located above the backrest 1011 as shown in FIG5 , the speaker 103 can be located in an area on the backrest 1011 that is opposite the headrest 102. 5 also takes 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 the 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] Furthermore, optionally, in order 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, referring to FIG3 , when the speaker 103 is arranged on the backrest 1011 behind the headrest 102, the user's head is located in front of the headrest 102. In this case, the diaphragm surface of the speaker 103 can face forward. Alternatively, referring to FIG5 , when the speaker 103 is arranged on the top surface of the backrest 1011, the user's head is located 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 one possible design method. The specific direction in which the diaphragm surface of the speaker 103 faces can be determined according to the designer's habits or actual application scenarios, and this application does not make any specific restrictions on this.

[0081] 2. Headrest

[0082] Please refer to Figure 6, which shows a schematic structural diagram of a headrest provided by the present application, wherein Figure 6 (A) shows a front view of the headrest, and Figure 6 (B) shows a top view of the headrest. As shown in Figures 6 (A) and 6 (B), the headrest 102 may include a headrest body 1021 and flip portions 1022 swingably disposed on both sides of the headrest body 1021, such as a first flip portion 1022a disposed on the right side and a second flip portion 1022b disposed on the left side. The first flip portion 1022a and the second flip portion 1022b are respectively rotatably connected to the headrest body 1021 (also known as a transmission connection), and can rotate relative to the headrest 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, the first flip part 1022a and the second flip part 1022b can be provided with a microphone 104. During the process of switching from the second mode to the first mode, the first flip part 1022a and the second flip part 1022b rotate relative to each other along the +X direction shown in the figure and stop at a position close to the user's ear, as shown in (C) in Figure 3 or (C) in Figure 5. At this time, the microphone 104 set inside the first flip part 1022a and the second flip part 1022b is also close to the user's ear. Therefore, the difference between the primary sound field noise received by the microphone 104 and the user's ear is small. If the speaker 103 is already playing anti-phase noise, the difference between the secondary sound field noise received by the microphone 104 and the user's ear is also small. The noise collected by the microphone 104 is closer to the noise heard at the user's ear. Active noise reduction is performed using this noise, which can effectively adapt to the user's noise reduction needs for the first mode. On the contrary, in the process of switching from the first mode to the second mode, the first flip part 1022a and the second flip part 1022b rotate opposite to each other along the -X direction shown in the figure and stop at a position away from the user's ears, as shown in (B) in Figure 3 or (B) in Figure 5. At this time, the first flip part 1022a and the second flip part 1022b are flattened, so that the user can have a larger head movement space, effectively adapting to the user's head movement needs for the second mode.

[0083] Optionally, the headrest 102 is fixed to the seat body 101, which may refer to the headrest body 1021 being fixed to the backrest 1011. The headrest body 1021 includes a skin and a filler, the filler being filled in the skin to support the skin, and the filler being, for example, a relatively soft material such as a sponge. When the headrest 102 is suspended in front of the backrest 1011 as shown in FIG3 , the headrest body 1021 can be fixed to the backrest 1011 by gluing or other methods, for example, the skin of the headrest body 1021 is glued to the backrest 1011. When the headrest 102 is connected to the backrest 1011 as shown in FIG5 , the headrest body 1021 can be connected to the backrest 1011 via a connecting rod 106, for example, one end of the connecting rod 106 is placed in the skin of the headrest body 1021, and the other end is connected to the backrest 1011. Thus, when the flip portion 1022 rotates relative to or away from the headrest body 1021, the flip portion 1022 rotates away from or toward the backrest 1011, so that the distance between the microphone 104 provided in the flip portion 1022 and the speaker 103 provided in the backrest 1011 becomes larger or smaller.

[0084] Optionally, referring to FIG. 6 , the headrest 102 may further include a rotation mechanism 1023, through which the flip portion 1022 is rotationally connected to the headrest body 1021. The rotation mechanism 1023 may be, for example, a rotating shaft, a hinge, a gear, a universal joint, or other mechanism capable of achieving relative rotation between two components. The rotation mechanism 1023 may specifically include a first rotation mechanism 1023a and a second rotation mechanism 1023b. The first flip portion 1022a is rotationally connected to the headrest body 1021 via the first rotation mechanism 1023a, and the second flip portion 1022b is rotationally connected to the headrest body 1021 via the second rotation mechanism 1023b. In some scenarios, in order to ensure the synchronization of rotation of the first flip part 1022a and the second flip part 1022b, the first rotating mechanism 1023a and the second rotating mechanism 1023b can also be connected by a synchronization component (not shown in the figure). The synchronization component can, for example, be composed of two gears, the two gears are engaged 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 consistent.

[0085] Furthermore, optionally, the headrest 102 may further include a driver 107, which may be, for example, a motor. The driver 107 is connected to the rotation mechanism 1023 and is configured to drive the rotation mechanism 1023 to rotate the flip portion 1022. For example, when switching from the second mode to the first mode, the driver 107 may drive the first rotation mechanism 1023a to rotate the first flip portion 1022a, and drive the second rotation mechanism 1023b to rotate the second flip portion 1022b, so that the first flip portion 1022a and the second flip portion 1022b rotate relative to each other to the position shown in FIG. 3 (C) or FIG. 5 (C). Furthermore, 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 to the position shown in (B) in Figure 3 or (B) in Figure 5.

[0086] The driver 107 can be positioned anywhere within the headrest 102. For example, FIG6 illustrates a configuration in which the driver 107 is positioned within the headrest body 1021. Thus, the driver 107 can be directly connected to the rotation mechanisms 1023 on either side via wiring disposed within the headrest body 1021, without requiring the wiring to pass through the movable portion between the flip portion 1022 and the headrest body 1021. This prevents the wiring from being damaged by frequent bending. It should be understood that, in other possible configurations, the driver 107 can also be positioned within one flip portion 1022, or within both flip portions 1022 and each connected to a corresponding rotation mechanism 1023, or within the backrest 1011, and so forth. This application does not impose specific limitations on this.

[0087] Taking the example of a headrest 102 suspended in front of the backrest 1011 and the driver 107 disposed within the headrest body 1021, refer to FIG7 , which illustrates a schematic diagram of the assembly structure of a headrest and backrest provided by the present application. FIG7 shows only the headrest and the backrest in the area overlapping the headrest. The left side of FIG7 illustrates a three-dimensional view of the assembly structure, while the right side of FIG7 illustrates a multi-piece structure obtained by slicing the left three-dimensional assembly structure. As shown in FIG7 , the assembly structure is divided into slices S1 and S2. Slice S1 corresponds to the portion of the backrest 1011 and can be considered to be a slice obtained by cutting the portion of the backrest 1011 from the assembly structure along the plane where the backrest 1011 and the headrest 102 meet. Two speakers 103 are located on the left and right sides of slice S1, one speaker 103 being closer to the user's left ear and the other speaker 103 being closer to the user's right ear. In contrast to the slice S1, the slice S2 is a slice corresponding to the headrest 102. The entire slice S2 is divided into four sub-slices along the direction from left to right (i.e., the direction v in the figure), i.e., sub-slices S 21 , sub-slice S 22 , sub-slice S 23 and sub-slice S 24 Among them, the sub-slice S 21 It can be considered as the left half slice of slice S2. The internal components of the left half slice are not shown. For details, please refer to sub-slice S2. 22 ~Sub-slice S 24 . Sub-slice S 22 It can be considered as the headrest body 1021 portion cut from the right half of the slice S2, in which the driver 107 is provided. 23 It can be considered as the rotation mechanism part cut from the right half of the slice S2, including the second rotation mechanism 1023b, and the figure takes the rotation axis as an example. 24 It can be considered as the flip portion cut from the right half of the slice S2, in which the microphone 104 is provided.

[0088] Furthermore, the microphones 104 can optionally be located not only in the flip portion 1022 but also in the headrest body 1021. The number of microphones 104 in the headrest body 1021 and in either flip portion 1022 can be one or more. For example, Figure 6 illustrates two microphone groups (microphone group 1 104a and microphone group 2 104b). Microphone group 1 104a is located closer to the user's right ear, while microphone group 2 104b is located closer to the user's left ear. Each microphone group may include four microphones, two of which are located on the upper and lower sides of the flip portion edge, and two of which are located on the upper and lower sides of the headrest body 1021 near the flip portion edge. This way, regardless of the height of the user sitting on the seat body 101, one microphone in each microphone group will always be closer to the user's ear. The noise collected by this microphone can be considered the noise heard at the user's ear. This noise can be used to generate anti-phase noise, thereby improving the noise reduction effect at the user's ear.

[0089] Furthermore, optionally, when the flip portion 1022 is rotated 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. 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 and the user's ear. For example, the microphone closest to the user's right ear is typically the microphone on the upper or lower side of the edge of the first flip portion 1022a, and the microphone closest to the user's left ear is typically the microphone on the upper or lower side of the edge of the second flip portion 1022b. The first distance can be understood as a distance at which the difference between the noise heard by the user's ear is minimal. This distance can be determined by those skilled in the art based on experience or obtained through experimental testing. For example, in one example, experimental testing 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 is not much different from the noise heard at the user's ear. 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 noise source outside the vehicle. The noise collected by the microphone 104 is closer to the noise heard at the user's ear, which helps to improve the effect of the anti-phase noise canceling the noise heard at the user's ear.

[0090] 3. Controller

[0091] Alternatively, the controller can be any device capable of performing a control function. It can be located within or outside the seat 100. It can be a controller specifically designed to perform noise reduction, or it can simultaneously perform other functions while performing noise reduction. For example, in an in-vehicle scenario, in one example, the controller can be a cockpit domain controller or a vehicle control unit (VCU). This allows the seat noise reduction function to be implemented using existing controllers in the vehicle, thereby increasing the utilization rate of in-vehicle components. Alternatively, in another example, to reduce the workload of the cockpit domain controller or VCU, a separate controller specifically designed to perform seat noise reduction can be provided. This controller can be located within the seat body 101 or the headrest 102, or it can be independent of the seat 100 and connected via wiring to the speaker 103 in the backrest 1011, the microphone 104 in the headrest 102, and the driver 107.

[0092] For example, referring to FIG8 , a schematic diagram of the architecture of a control circuit provided by the present application is shown, assuming that the controller is located outside the seat 100. This control circuit can be, for example, an in-vehicle audio system or an in-vehicle active noise reduction system. The architecture includes a controller 300, a seat body 101, and a headrest 102. The seat body 101 includes a backrest 1011, which is equipped with a speaker 103. The headrest 102 includes a microphone 104, a driver 107, a rotation mechanism 1023, the headrest body 1021, and a flip portion 1022. The controller 300 is connected to the driver 107, the microphone 104, and the speaker 103, respectively. The driver 107 is connected to the rotation mechanism 1023, which realizes the rotational connection between the headrest body 1021 and the flip portion 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 flip part 1022 to rotate toward the user's ear, and can control the microphone 104 and the speaker 103 to turn on to start active noise reduction in the first mode.

[0093] Furthermore, optionally, when to switch to the first mode can be determined by the user or 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 or video, so that the controller 300 controls the microphone 104 and the speaker 103 to turn on according to the instruction. Alternatively, the controller 300 can automatically control the microphone 104 and the speaker 103 to turn on when it detects that the user is watching audio or video (such as watching the mobile phone screen for a long time in landscape mode) in conjunction with a camera or other device. 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 automatically control the microphone 104 and the speaker 103 to turn on according to the instruction. Alternatively, the controller 300 can automatically control the microphone 104 and the speaker 103 to turn on when it detects that the user is lying on the chair for a long time in conjunction with a camera or other device. 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] Taking the first mode as the rest mode and the controller 300 independently determining when to switch to the rest mode as an example, please refer to Figure 9, which shows a schematic diagram of the interactive flow of a control method provided by the present application. This method is applicable to the aforementioned controller 300, driver 107, microphone 104, and speaker 103. In conjunction with Figures 8, 9, 6, 3, and 5, the method includes 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 immersive sound playback, navigation playback, or real-time traffic reminders.

[0097] Furthermore, optionally, after the seat 100 is powered on or powered on, if the controller 300 determines that a trigger condition is currently met, it can initiate a periodic noise reduction control strategy. During each period, the controller detects the posture of the user sitting in the seat 100 relative to the seat 100. The duration of each period can be set by those skilled in the art based on experience, for example, 5 minutes. The trigger condition can be configured based on specific application scenarios. For example, in one example, considering that wind noise and tire friction outside the vehicle only generate relatively loud low-frequency noise inside the vehicle at relatively high speeds, the trigger condition can be configured as the vehicle speed exceeding a preset speed, such as 10 kilometers per hour (km / h). In another example, to ensure a good noise reduction experience for the user throughout the entire journey, the trigger condition can also be configured as the seat 100 being powered on or powered on. In other words, the controller 300 begins detecting the user's posture after determining that the seat 100 is powered on or powered on. Once it determines that the user is in rest mode, active noise reduction can be activated. For another example, the trigger condition can also be configured to receive a user instruction. The controller 300 initiates periodic detection only when the user instruction is received to activate the noise reduction control strategy, and does not initiate detection when no user instruction is received. This satisfies the different noise reduction control requirements of different users. These examples are not listed here one by one.

[0098] Further, optionally, the user's posture 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 user's posture relative to the seat 100, such as:

[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. Taking the seat shown in Figure 3 as an example, Figure 10a (A) shows a front view of the seat, Figure 10a (B) shows a second mode view of the seat, and Figure 10a (C) shows a first mode view of the seat. As shown in Figure 10a, in this example, in addition to the aforementioned components, the seat 100 may also include a pressure detection unit 105. The pressure detection unit 105 may be provided only on the headrest body 1021 (i.e., a first pressure detection unit 105a), or may be provided on both the headrest body 1021 and the backrest 1011 (i.e., a second pressure detection unit 105b). The pressure detection unit 105 may be any device capable of detecting pressure values. For example, in one example, it may be a pressure sensor. The pressure sensors may include multiple pressure sensors, which are evenly distributed over the main force-bearing areas of the headrest body 1021, the backrest 1011, or both. For example, in another embodiment, the pressure detection unit 105 may be a pressure sensing film directly attached to the main force-bearing areas of the headrest body 1021, the backrest 1011, or both, and may be used to detect the pressure applied by the user to the pressure sensing film. In another embodiment, a seat cover may be made directly of a soft, pressure-sensitive material, such as a pressure-sensitive textile. This seat cover is attached to the outside of the backrest 1011 and the headrest 102, forming the exterior surface of the seat 100, and may be used to directly detect the pressure applied by the user to the seat cover.

[0101] Furthermore, optionally, taking the arrangement on the headrest body 1021 and the backrest 1011 as an example, the first pressure detection unit 105a and the second pressure detection unit 105b can both be connected to the controller 300 (not shown). The first pressure detection unit 105a can detect the first pressure exerted on the headrest body 1021 in real time and transmit it to the controller 300. The second pressure detection unit 105b can detect the second pressure exerted on the backrest 1011 in real time and transmit it to the controller 300. Based on the first and second pressures received at the same moment, the controller 300 can determine that the user is currently lying on the seat 100 if it determines that the first pressure is greater than a first pressure threshold and the second pressure is greater than a second pressure threshold. The first pressure threshold is used to indicate the critical pressure value at which the user's head rests on the headrest body 1021, and the second pressure threshold is used to indicate the critical pressure value at which the user's back rests on the backrest 1011. The first and second pressure thresholds can be obtained, for example, through experimental testing.

[0102] Using posture detection method 1, the controller determines whether the user is reclining in the seat by analyzing the pressure of the user's head on the headrest body, or also by analyzing the pressure of the user's back on the backrest. The pressure detection unit typically collects data at a high frequency, providing good real-time performance. Therefore, this detection method can promptly determine the user's posture at any given moment. Furthermore, combining head and back pressure to comprehensively determine whether the user is reclining in the seat avoids misjudgments caused by analyzing head pressure alone, helping to improve the accuracy of user posture detection.

[0103] Posture detection method 2

[0104] Please refer to Figure 10b, which shows a schematic diagram of a device using a seat provided by the present application, using the seat shown in Figure 5 as an example. In conjunction 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 may be connected to the controller 300 and periodically capture images of a user sitting on the seat 100 (the period duration is much shorter than the period duration of the control strategy, for example, 5 seconds) and transmit the images to the controller 300. The controller 300 detects the images received at each moment and determines the distance between the user's head in the image and the headrest body 1021 of the seat 100. When the distance is less than a distance threshold, it is determined that the user is currently leaning against the headrest body 1021, and furthermore, the user may be considered to be lying on the seat 100. The distance threshold indicates the critical distance at which the user's head is leaning against the headrest body 1021. Ideally, it is 0, but to account for the influence of errors, it can also be set to a value close to 0, such as 1 cm.

[0105] Optionally, the aforementioned camera module 400 may be, for example, a depth camera, which may capture first depth information between the user's head and the camera module 400 and second depth information between the headrest body 1021 and the camera module 400. The controller 300 may obtain a first distance between the user's head and the camera module 400 and a second distance between the headrest body 1021 and the camera module 400 by performing algorithmic recognition on the first depth information and the second depth information, and may then use the difference between the second distance and the first distance as the distance between the user's head and the headrest body 1021. Alternatively, in some scenarios, the controller 300 can also obtain the correspondence between multiple preset positions and multiple second distances, where the multiple positions refer to any position of the seat 100 during the forward and backward movement, and the second distance corresponding to the position refers to the distance between the headrest body 1021 and the camera module 400 when the seat 100 is in this position. The correspondence 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 is understandable that the camera module 400 may also be other types of cameras, for example, a binocular camera. By calculating the parallax of the binocularly captured images, the distance from the binocular camera to the user's head can be estimated. Alternatively, it may be an ordinary camera, which can be located above the seat. By capturing an image of the user sitting on the seat 100 from above, the distance between the user's head and the headrest body 1021 can be directly identified from the image. In addition, FIG10b takes the camera module 400 as an example of being placed directly in front of the seat 100, but the camera module 400 can also be placed in other positions of the seat 100, such as the left front, right front, upper front, or lower front, etc., and this application does not limit this.

[0107] Using posture detection method 2, the controller can determine whether the user's head is resting on the headrest body by analyzing the distance between the user's head and the headrest body, and then determine whether the user is lying on the seat. Distance detection is more intuitive than pressure detection and can make posture detection more accurate.

[0108] It should be noted that the above examples only provide two possible posture detection methods. In actual scenarios, other methods can also be used to detect user posture. For example, in another example, deformation detection sensors can be installed on the headrest body 1021 and backrest 1011 of the seat 100. By detecting the deformation of the headrest body 1021 and backrest 1011, it can be detected whether the user is lying on the seat 100. Alternatively, in another example, a radar can be installed in front of one or more surfaces of the seat 100. The radar can be a laser radar or an ultrasonic radar. 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. I will not list them one by one here.

[0109] In step 902 , the controller 300 determines whether the user's head is stably resting on the headrest body 1021 based on the user's posture relative to the seat 100 . If so, step 903 is executed; otherwise, step 910 is executed.

[0110] Optionally, after each cycle begins, the controller 300 may obtain changes in the user's posture relative to the seat 100 within a set time period. If the user remains lying on the seat 100 during the set time period, it may be determined that the user's head is stably resting on the headrest body 1021. Otherwise, it may be determined that the user's head is not stably resting on the headrest body 1021. The set time period may be a time period less than the cycle period, such as 1 minute.

[0111] Taking 1 minute as an example, when posture detection method 1 is used to detect the user's posture, if the controller 300 determines that the pressure collected by the pressure detection unit 105 within 1 minute is consistently greater than the pressure threshold, it indicates that the headrest body 1021 (or also includes the backrest 1011) has been subjected to relatively high pressure throughout the 1 minute, and further indicates that the user's head is consistently resting against the headrest body 1021 (or also includes that the user's back is consistently resting against the backrest 1011). In this case, the controller 300 can determine that the user's head is stably resting against the headrest 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 consistently leave the headrest body 1021 (or also that the user's back may occasionally, frequently, or consistently leave the backrest 1011). In this case, the controller 300 can determine that the user's head is not stably resting against the headrest body 1021.

[0112] Similarly, when using posture detection method 2 to detect the user's posture, if the controller 300 determines that the distance between the user's head and the headrest body 1021 is always less than the distance threshold within 1 minute, it means that the user's head is always resting on the headrest body 1021 during this 1 minute. In this case, the controller 300 can determine that the user's head is stably resting on the headrest body 1021. Conversely, if it is determined that the distance between the user's head and the headrest body 1021 is greater than the distance threshold for at least one time within 1 minute, it means that the user's head may occasionally, frequently, or always leave the headrest body 1021. In this case, the controller 300 can determine that the user's head is not stably resting on the headrest body 1021.

[0113] In step 903 , the controller determines whether the system is currently in the first mode. If not, the controller executes step 904 . If yes, the controller executes step 901 .

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

[0115] Optionally, after determining that the current mode should be adjusted to rest mode, the controller 300 may also issue a first prompt message to the user before performing specific adjustment operations. The first prompt message is used to prompt the user whether to turn on rest mode. The first prompt message can be issued in a variety of ways, such as: it can be issued by voice, such as directly issuing a prompt sound through the speaker 103; or it can be issued by display, such as popping up a prompt box on a display screen in front of or near the seat. The display screen can be, for example, the vehicle computer display screen or the rear seat display screen. Any screen that can display; or it can be issued by voice and display together to ensure that the user receives the prompt if the user is not paying attention to one of them. When the prompt is issued by voice, the user can indicate whether to turn on rest mode or not by voice, and the instruction information will be collected by the vehicle voice module and sent to the controller 300. When the prompt is issued by display, the user can choose to turn on rest mode or not by selecting the prompt box that pops up on the screen. The instruction information will be collected by the vehicle computer and sent to the controller 300. If the controller 300 receives an instruction to enable the rest mode, it can bring the microphone 104 close to the user's ear by executing steps 904 and 905, and activate the active noise reduction function by executing steps 906 to 909. Conversely, if it receives an instruction not to enable the rest mode, the controller 300 can wait until the current cycle ends and then activate the noise reduction control strategy for the next cycle.

[0116] Step 904 : The controller sends first instruction information to the driver 107 .

[0117] In step 905 , the driver 107 drives the rotating mechanism 1023 to rotate the flip portion 1022 to a position close to the user's ear according to the first instruction information.

[0118] Combined with Figure 6 and Figure 3, or Figure 6 and Figure 5, in the non-resting mode, the first flip part 1022a, the second flip part 1022b and the headrest body 1021 are as shown in Figure 3 (B) or Figure 5 (B). The driver 107 can control the first rotating mechanism 1023a and the second rotating mechanism 1023b to drive the first flip part 1022a and the second flip part 1022b to rotate relative to each other in the +X direction according to the first indication information, so that the microphones 104 in the first flip part 1022a and the second flip part 1022b gradually approach the user's ears, and finally stop at the position where the first flip part 1022a and the second flip part 1022b are close to the user's ears, as shown in Figure 3 (C) or Figure 5 (C). In this position, the first flip portion 1022a, the second flip portion 1022b, and the headrest body 1021 form a relatively narrow space suitable for accommodating the user's head. The distance between the microphone 104 and the user's ear is no greater than a first distance, which can be set, for example, to 5 cm. Furthermore, during the rotation of the first flip portion 1022a and the second flip portion 1022b, the distance between the speaker 103 and the user's ear remains constant and is within a first set range, which can be set, for example, to [10 cm, 30 cm].

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

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

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

[0122] In step 908 , the controller generates anti-phase noise according to the noise collected by the microphone 104 and sends the anti-phase noise to the speaker 103 .

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

[0124] Optionally, in conjunction with Figures 6 and 3, or Figures 6 and 5, in rest mode, the controller 300 can control microphone group 1 104a, microphone group 2 104b, first speaker 103a, and second speaker 103b to operate. Each microphone in microphone group 1 104a and microphone group 2 104b, when in operation, collects noise at its location and transmits it to the controller 300. The controller 300 can calculate a first inverted phase noise and a second inverted phase noise based on the noise collected by each microphone in microphone group 1 104a and microphone group 2 104b using an internal algorithm, and transmit the first inverted phase noise to the first speaker 103a and the second inverted phase noise to the second speaker 103b. When in operation, the first speaker 103a plays the first inverted phase noise, and when in operation, the second speaker 103b plays the second inverted phase noise. After the first anti-phase noise played by the first speaker 103a and the second anti-phase noise played by the second speaker 103b reach the user's right ear, they are superimposed to reduce noise in 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 reach the user's left ear, they are superimposed to reduce noise in the user's left ear. By combining the two speakers to reduce noise for each ear, the noise heard by both ears can be effectively suppressed, improving the noise reduction effect for the user's ears.

[0125] Furthermore, optionally, using 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 detect the microphone closest to the user's right ear in microphone group 104a using a camera or other device, then flip the phase of the noise collected by this microphone by 180 degrees to obtain the first anti-phase noise. In another example, the controller 300 can first average or weighted average the noise collected by all microphones in microphone group 104a, then flip the phase of the average noise or weighted average noise by 180 degrees to obtain the first anti-phase noise. The weight corresponding to each microphone can be determined based on its distance from the user's right ear, with the smaller the distance, the larger the weight that can be set. In another example, the controller 300 can also obtain the median noise of all the noise collected by all microphones in microphone group 104a, flip the phase of this median noise by 180 degrees to obtain the first anti-phase noise. And so on. I will not list them all here.

[0126] In steps 904 to 909, the user is switched to rest mode while their head is resting steadily against the headrest body, actively reducing noise for the user and improving their rest or sleep comfort. Furthermore, when switching to rest mode, the flip portion 1022 rotates the microphone 104 to a position closer to the user's ear, minimizing the difference in primary sound field between the microphone 104 and the user's ear. Furthermore, 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. Consequently, the difference in secondary sound field between the user's ear and the microphone 104 is also minimal. Consequently, the noise collected by the microphone is closer to the noise heard by the user's ear, and the corresponding anti-phase noise effectively offsets the noise heard by the user's ear, thereby achieving better noise reduction performance at the human ear and providing a quieter riding experience. In addition, during the rotation of the microphone 104, the distance between the speaker 103 and the user's ear remains unchanged. 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 when resting or sleeping, the sound played by the speaker 103 heard by the user's ear will not change much. This can also provide a stable noise reduction experience for the user's ear when the user is resting or sleeping.

[0127] In step 910 , the controller determines whether the system is currently in the second mode. If not, the controller executes step 911 . If yes, the controller executes step 901 .

[0128] It is understandable that when the user's head is not resting or sleeping, it means that the user is not resting or sleeping. The user may need a larger head movement space and need to switch to non-resting mode. At this time, if the current mode is not non-resting mode, the controller 300 can adjust the current mode to non-resting mode. Conversely, if the current mode is non-resting mode, no adjustment is required. The controller 300 can wait for the current cycle to end and start the noise reduction control strategy for the next cycle.

[0129] Optionally, after determining that the current mode should be adjusted to a non-rest mode, the controller 300 may also issue a second prompt to the user before performing the specific adjustment operation. The second prompt is used to prompt the user whether to turn off the rest mode. The second prompt can be issued in a variety of ways, such as: it can be issued by voice, such as directly issuing a prompt sound through the speaker 103; or it can be issued by display, such as popping up a prompt box on a display in front of or near the seat. The display can be, for example, the vehicle display or the rear seat display, or any other screen that can display; or it can be issued by voice and display together to ensure that the user receives the prompt if the user is not paying attention to one of them. When the prompt is issued by voice, the user can indicate whether to turn off the rest mode or not by voice, and the instruction information will be collected by the vehicle voice module and sent to the controller 300. When the prompt is issued by display, the user can choose to turn off the rest mode or not by selecting the prompt box that pops up on the screen. The instruction information will be collected by the vehicle and sent to the controller 300. If the controller 300 receives an instruction to disable the rest mode, it may move the flip portion 1022 away from the user's ear by executing steps 911 and 912, and disable the active noise reduction function or reduce the noise reduction level of the active noise reduction function by executing step 913. Conversely, if it receives an instruction not to disable the rest mode, the controller 300 may wait until the current cycle ends before initiating the noise reduction control strategy for the next cycle.

[0130] Step 911 : The controller sends second instruction information to the driver 107 .

[0131] In step 912 , the driver 107 drives the rotating mechanism 1023 to drive the flip portion 1022 to rotate to a position away from the user's ear according to the second instruction information.

[0132] In conjunction with Figures 6 and 3, or Figures 6 and 5, in the rest mode, the first flip portion 1022a, the second flip portion 1022b, and the headrest body 1021 appear as shown in Figure 3 (C) or Figure 5 (C). Based on the second indication information, the driver 107 can control the first rotation mechanism 1023a and the second rotation mechanism 1023b to rotate the first flip portion 1022a and the second flip portion 1022b in opposite directions in the -X direction, so that the first flip portion 1022a and the second flip portion 1022b gradually move away from the user's ears and eventually stop in a position where the first flip portion 1022a and the second flip portion 1022b are deployed. In this position, the first flip portion 1022a, the second flip portion 1022b, and the headrest body 1021 are located on the same curved surface, as shown in Figure 3 (B) or Figure 5 (B). With the two flip portions deployed, the user's head has a larger space for movement, facilitating free movement of the user's head when not in the rest mode.

[0133] In step 913 , the controller 300 controls the microphone 104 to be turned off, or reduces the noise reduction degree of the speaker 103 playing the reverse phase noise for noise reduction.

[0134] Optionally, in non-rest mode, if the speaker 103 is used for active noise reduction as well as for other functions (such as issuing the first prompt information, immersive sound playback, navigation playback or traffic reminder as described in the aforementioned step 904), the controller 300 may only control the microphone 104 to be turned off, while keeping the speaker 103 on. Conversely, if the speaker 103 is only used for active noise reduction, the controller 300 may control both the microphone 104 and the speaker 103 to be turned off, thereby turning off the active noise reduction function, or may only control the speaker 103 to reduce the degree of noise reduction by playing the inverted noise, while neither the microphone 104 nor the speaker 103 is turned off. Among them, the degree of noise reduction by the speaker 103 playing the inverted noise is related to the upper frequency limit of the inverted noise played by the speaker 103. The smaller the upper frequency limit of the inverted noise, the larger the wavelength of the inverted noise, the larger the effective noise reduction area, but the less ambient noise that can be offset, and the lower the noise reduction degree. Therefore, when switching from rest mode to non-rest mode, the controller 300 can lower the upper frequency limit of the anti-phase noise played by the speaker 103. For example, the upper frequency limit in rest mode is 1000Hz, and it can be lowered to 500Hz in non-rest mode. In this way, even in non-rest mode, the distance between the user's ear and the speaker 103 becomes farther due to the user's head movement, 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 lowered, compared with the rest mode, the anti-phase noise has no noise reduction effect on the noise in those frequency bands where the upper frequency limit is lowered (i.e., 500Hz to 1000Hz), thereby reducing the degree of noise reduction of the anti-phase noise.

[0135] Furthermore, optionally, multiple noise reduction modes can be pre-configured. After the controller 300 issues the second prompt message in the aforementioned 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 may include, for example, a deep noise reduction mode, a moderate noise reduction mode, a shallow 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 limit of the frequency of the speaker 103 playing the anti-phase noise corresponding to the deep noise reduction mode is 1000Hz, the upper limit of the frequency of the speaker 103 playing the anti-phase noise corresponding to the moderate noise reduction mode is 500Hz, the upper limit of the frequency of the speaker 103 playing the anti-phase noise corresponding to the shallow noise reduction mode is 200Hz, and the upper limit of the frequency of the speaker 103 playing the anti-phase noise corresponding to the no noise reduction mode is 0Hz. Thus, upon receiving the user's selection of a noise reduction mode, if the user has selected one of the deep, medium, or shallow noise reduction modes, the controller 300 may adjust the upper frequency limit of the anti-phase noise played by the speaker 103 to the upper frequency limit corresponding to the selected noise reduction mode, while keeping both the microphone 104 and the speaker 103 intact. If the user has selected the no noise reduction mode, the controller 300 may control the microphone 104 to be turned off, and the speaker 103 to be turned off or on. Turning off the speaker 103 can save power, but if the speaker 103 is left on and can be used for other functions, it can improve the utilization of the speaker 103.

[0136] Based on the structure and function of the seat described above, the present application can also provide a vehicle, including the aforementioned seat and controller, such as the seat 100 and controller 300 shown in Figure 8. During the driving of the vehicle, the controller is used to control the seat to be in a first mode when it detects that the user's head is stably leaning against the headrest. Optionally, the controller can also be used to control the seat to be in a second mode when it detects that the user's head is not stably leaning against the headrest. For relevant content about the controller and the seat, please refer directly to the relevant introduction in Figures 8 and 9 above, and no further details will be repeated here.

[0137] The above-mentioned means of transportation may include, but are not limited to: cars, trucks, buses, ships, airplanes, helicopters, recreational vehicles, amusement park vehicles, construction vehicles, trams, golf carts, trains, unmanned vehicles, smart cars and digital cars, etc.

[0138] In this application, "at least one" means one or more, and "plurality" means two or more. "There is at least one item (individual)" or similar expressions thereof refers to any combination of these items, including any combination of single items (individual) or plural items (individual). For example, at least one item (individual) 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, c can be single or multiple. In addition, in this application, the word "exemplarily" or "optionally" is used to indicate an example, illustration or description. Any embodiment or design described in this application as "example" or "optional" should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Alternatively, it can be understood that the use of the word "example" or "optional" is intended to present concepts in a specific way and does not constitute a limitation on this application.

[0139] It will be appreciated that the various numerical numbers involved in this application are merely for the purpose of describing the distinctions made, and are not intended to limit the scope of the embodiments of the present application. The size of the sequence numbers of the above-mentioned processes does not imply the order of execution, and the order of execution of each process should be determined by its function and inherent logic. Terms such as "first", "second", and similar expressions are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, comprising a series of steps or units. Methods, systems, products, or devices are not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or devices.

Claims

1. A seat, characterized in that: It comprises a seat body and a headrest, wherein the headrest is fixed to the seat body, a microphone is arranged in the headrest, and the seat body comprises a backrest, and a speaker is arranged in the backrest; In the first mode, the microphone is used to collect noise, and the speaker is used to play 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 degree of noise reduction achieved by the loudspeaker playing anti-phase noise is lower than that corresponding to the first mode.

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

4. The seat according to any one of claims 1 to 3, characterized in that: The headrest is suspended in front of the backrest, and the speaker is arranged on the backrest in an area overlapping 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 through a connecting rod, and the speaker is arranged in a region of the backrest opposite to the headrest.

6. The seat according to any one of claims 1 to 5, characterized in that The headrest comprises a headrest body and a flip part swingably arranged on both sides of the headrest body, the headrest body is fixed to the backrest, and the microphone is arranged on the flip part; In the first mode, the flip portion is located close to a human ear.

7. The seat according to claim 6, characterized in that In the second mode, the flip portion is located away from the human ear.

8. The seat according to claim 7, characterized in that The flipping part is connected to the headrest body through a rotating mechanism, a driver is arranged in the headrest body, and the driver is connected to the rotating mechanism; The driver is used to determine that when switching from the second mode to the first mode, the rotating mechanism drives the flip part to rotate to a position close to the human ear, and when switching from the first mode to the second mode, the rotating mechanism drives the flip part to rotate to a position away from the human ear.

9. The seat according to claim 8, characterized in that The driver is connected to the controller; The controller is configured to send first indication information to the driver when it is determined that the user's head is stably leaning against the headrest body and is currently in the second mode, and to send second indication information to the driver when it is determined that the user's head is not stably leaning against the headrest body and is currently in the first mode; The driver is used to determine, according to the first indication information, to switch from the second mode to the first mode, and, according to the second indication information, to determine to switch from the first mode to the second mode.

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

11. The seat according to claim 9, characterized in that A camera module is provided in front of the seat, and the camera module is connected to the controller; The camera module is used to capture an image of the seat and send the image to the controller; The controller is used to determine the distance between the user's head and the headrest body of the seat based on the image. When the distance within a set time period is 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: Sending 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. A seat according to any one of claims 9 to 12, characterized in that After the controller sends the first indication information to the driver, the controller is further configured to: Turn on the microphone and the speaker.

14. A seat according to any one of claims 9 to 13, characterized in that After the controller sends the second indication information to the driver, the controller is further used to: The microphone is turned off, or the noise reduction degree of the speaker playing the anti-phase noise for noise reduction is reduced.

15. A means of transport, characterized in that: comprising a controller and a seat as claimed in any one of claims 1 to 14; The controller is used to control the seat to be in the first mode when it is detected that the user's head is stably leaning against the headrest.

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