Cabin sound field partition control method and system and vehicle

Abstract

The invention provides a cabin sound field partition control method and system and a vehicle, and relates to the technical field of automobile control. The cabin comprises a plurality of sound field areas; each sound field area is determined based on the area position of at least one seat in the cabin, and a left loudspeaker and a right loudspeaker are arranged on the two sides of a headrest of each seat; wherein for each sound field area, a vehicle door loudspeaker is arranged on the vehicle door corresponding to the sound field area. According to the method, audio playing is carried out through a vehicle door loudspeaker corresponding to a target sound field area; at least one of the left loudspeaker and the right loudspeaker in the target sound field area outputs the anti-phase counteracting sound waves to counteract the interference sound waves diffused to the target sound field area from the non-target sound field area, so that accurate partition of the cabin sound field is achieved, audiences in each sound field area can hear audio content of the area more clearly and independently, and the sound field effect of the cabin is improved. And the sound effect experience is improved.

Description

Technical Field

[0001] This application relates to the field of automotive control technology, and in particular to a method, system and vehicle for cabin sound field zoning control. Background Technology

[0002] With the development of intelligent vehicles, the intelligent cockpit of the car serves as a personal "third space," and the time that passengers spend in the car is gradually increasing. Different passengers have different needs in the car, such as resting, watching movies, and listening to music.

[0003] Traditional car audio systems are monolithic, with different speakers working together to create a single sound field, placing all occupants within that same field. To address the personalized entertainment needs of passengers, multiple independent sound fields need to be constructed around each passenger in their respective locations.

[0004] In related technologies, headrest speakers that can emit sound independently are installed in each seat to achieve zoning of the car audio system. However, in the above method, the headrest speakers are prone to audio loss due to their small diameter, resulting in a poor sound quality experience. Summary of the Invention

[0005] This application provides a cockpit sound field zoning control method, system, and vehicle to create independent sound fields and improve the audio experience of independent sound fields.

[0006] In a first aspect, embodiments of this application provide a cabin sound field zoning control method, wherein the cabin includes multiple sound field zones; each sound field zone is determined based on the regional position of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door near the corresponding sound field zone; the method includes: controlling the door speaker corresponding to the target sound field zone to play audio according to a first target audio to be played in the target sound field zone; acquiring the interference sound waves diffused by the door speakers corresponding to the remaining non-target sound field zones (excluding the target sound field zone) in the multiple sound field zones against the target sound field zone; and controlling at least one of the left and right speakers in the target sound field zone to output an anti-phase canceling sound wave based on the interference sound waves.

[0007] Based on the above, this embodiment of the application plays audio through door speakers. Compared with playing audio through headrest speakers, door speakers have a larger diameter and a wider bandwidth coverage, which is beneficial to improving the sound effect experience of the target sound field area. By using left and right speakers located on both sides of the headrest to cancel out the interference sound waves generated by the door speakers playing audio in other sound field areas at different locations, the acoustic isolation of the target sound field area can be effectively improved, achieving precise zoning of the cabin sound field. This allows listeners in each sound field area to hear the audio content of their area more clearly and independently, further enhancing the sound effect experience.

[0008] In one possible implementation, obtaining the interference sound waves diffused by the door speakers corresponding to the remaining non-target sound field areas (excluding the target sound field area) in the plurality of sound field areas to the target sound field area includes: for each non-target sound field area, obtaining the second target audio to be played from the door speakers of the non-target sound field area; processing the second target audio according to the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound waves diffused by the door speakers corresponding to the non-target sound field area to the target sound field area.

[0009] By acquiring the original audio to be played from the non-target sound field area and processing it in conjunction with the sound pressure attenuation ratio, it is possible to more accurately predict the interference sound waves propagating from the non-target sound field area to the target sound field area. This method does not rely on complex real-time acoustic sensor arrays, which helps to simplify the structure and improve the feasibility of interference sound wave calculation.

[0010] In one possible implementation, before processing the second target audio according to the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound wave diffused by the door speaker corresponding to the non-target sound field area to the target sound field area, the method includes: controlling the door speaker corresponding to the non-target sound field area to output a preset sound wave; detecting the sound wave diffused to a preset position in the target sound field area by the preset sound wave; and determining the sound pressure attenuation ratio according to the preset sound wave and the sound wave diffused to the preset position in the target sound field area.

[0011] The above method outputs a preset sound wave and measures its attenuation as it propagates to the target location, thereby determining the actual sound pressure attenuation ratio. In this process, the influence of the actual vehicle's internal structure on acoustic propagation is taken into account, making the sound pressure attenuation ratio closer to reality, and thus making subsequent interference sound waves and cancellation sound waves more accurate.

[0012] In one possible implementation, controlling at least one of the left and right speakers in the target sound field area to output an anti-phase cancelling sound wave based on the interfering sound wave includes: inverting the interfering sound wave to generate an initial anti-phase cancelling sound wave; delaying the initial anti-phase cancelling sound wave based on the time delay of the diffused interfering sound wave in the target sound field area according to the door speaker corresponding to the non-target sound field area; and controlling at least one of the left and right speakers in the target sound field area to output the delayed anti-phase cancelling sound wave.

[0013] The above method, by inverting the phase of the interfering sound wave and adjusting the corresponding delay of the inverted cancelling sound wave, ensures that the inverted cancelling sound wave emitted from the target sound field area is precisely aligned with the interfering sound wave in time and phase, thereby improving the sound wave cancellation effect.

[0014] In one possible implementation, before delaying the initial antiphase cancelling sound wave based on the time delay of the door speaker corresponding to the non-target sound field area for the diffuse interference sound wave in the target sound field area, the method includes: for each non-target sound field area, obtaining the distance between the door speaker in the non-target sound field area and a preset position in the target sound field area; and determining the time delay of the door speaker corresponding to the non-target sound field area for the diffuse interference sound wave in the target sound field area based on the distance and a pre-stored sound velocity.

[0015] This paper presents a method for obtaining sound wave propagation delay. By measuring the spatial distance between the door speaker in a non-target sound field area and a preset position, and combining this with the sound speed, the sound wave propagation delay is determined. This method is simple and direct, and reduces the processing complexity compared to determining the sound wave propagation delay by analyzing audio signals.

[0016] In one possible implementation, the remaining non-target sound field area includes a non-target sound field area on the same side as the target sound field area and a non-target sound field area on the opposite side of the target sound field area; the interfering sound wave includes a first interfering sound wave diffused into the target sound field area by a door speaker corresponding to a non-target sound field area on the same side as the target sound field area, and a second interfering sound wave diffused into the target sound field area by a door speaker corresponding to a non-target sound field area on the opposite side of the target sound field area; the step of controlling at least one of the left and right speakers in the target sound field area to output an anti-phase canceling sound wave based on the interfering sound wave includes: controlling the left and right speakers in the target sound field area to output an anti-phase canceling sound wave based on the first interfering sound wave and the second interfering sound wave.

[0017] Based on the actual sound field distribution of the cabin, the interference sound waves are subdivided into two categories: the first interference sound wave comes from the non-target sound field area on the same side, and the second interference sound wave comes from the non-target sound field area on the opposite side. The left and right speakers are used to cancel the sound waves separately, which helps to improve the sound field isolation effect and the sound experience.

[0018] In one possible implementation, controlling the left and right speakers in the target sound field area to output anti-phase canceling sound waves based on the first interference sound wave and the second interference sound wave includes: if the target sound field area is located on the left side of the cockpit, then controlling the left speaker in the target sound field area to output a first anti-phase canceling sound wave based on the first interference sound wave, and controlling the right speaker in the target sound field area to output a second anti-phase canceling sound wave based on the second interference sound wave; if the target sound field area is located on the right side of the cockpit, then controlling the right speaker in the target sound field area to output the first anti-phase canceling sound wave based on the first interference sound wave, and controlling the left speaker in the target sound field area to output the second anti-phase canceling sound wave based on the second interference sound wave.

[0019] Based on the actual sound field distribution of the cockpit, the interfering sound waves are subdivided into two categories. The sound wave cancellation targets of the left and right speakers are allocated according to the principle of proximity. This is more in line with the physical laws of acoustic propagation, which helps to improve the sound wave cancellation effect and thus enhance the audio experience.

[0020] In one possible implementation, there are multiple non-target sound field areas opposite the target sound field area, and the second interference sound wave includes multiple second interference sub-sound waves. If the target sound field area is located on the left side of the cockpit, the step of controlling the right speaker in the target sound field area to output a second anti-phase canceling sound wave based on the second interference sound wave includes: generating a corresponding second sub-anti-phase canceling sound wave based on each second interference sub-sound wave; superimposing multiple second sub-anti-phase canceling sound waves to obtain the second anti-phase canceling sound wave; and controlling the right speaker in the target sound field area to output the second anti-phase canceling sound wave.

[0021] This approach combines the actual sound field distribution of the cockpit with consideration of the case where there are multiple non-target sound field areas on the opposite side. By superimposing the separately generated sub-phase canceling sound waves, multiple interfering sound waves can be processed simultaneously, ensuring the independence of each sound field area and improving the audio experience.

[0022] Secondly, embodiments of this application provide a cabin sound field zoning control system, wherein the cabin includes multiple sound field zones; each sound field zone is determined based on the regional position of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door near the corresponding sound field zone; the system includes a controller, which is configured to execute the cabin sound field zoning control method as described in the first aspect.

[0023] Thirdly, embodiments of this application provide a vehicle, characterized in that the vehicle is equipped with a cabin sound field zoning control system as described in the second aspect.

[0024] Fourthly, this application provides a cabin sound field zoning control device, including: a playback module and a cancellation module; the cabin includes multiple sound field zones; each sound field zone is determined based on the regional position of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door near the corresponding sound field zone; the playback module is used to control the door speaker corresponding to the target sound field zone to play audio according to a first target audio to be played in the target sound field zone; the cancellation module is used to acquire the interference sound waves diffused by the door speakers of the remaining non-target sound field zones (excluding the target sound field zone) in the multiple sound field zones against the target sound field zone; the cancellation module is also used to control at least one of the left and right speakers in the target sound field zone to output an anti-phase cancellation sound wave based on the interference sound waves.

[0025] Fifthly, embodiments of this application provide a vehicle including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the cockpit sound field zoning control method as described in any of the first aspects.

[0026] In a sixth aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the cockpit sound field zoning control method as described in any of the first aspects.

[0027] It is understood that the beneficial effects of the second to sixth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of this application; Figure 2 This is a schematic flowchart of a cockpit sound field zoning control method provided in an embodiment of this application; Figure 3 A schematic flowchart of a cockpit sound field zoning control method provided in another embodiment of this application; Figure 4 A schematic diagram of the propagation path of interfering sound waves provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a cockpit sound field zoning control device provided in an embodiment of this application. Detailed Implementation

[0031] The present application will be described more clearly below with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the function of the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0032] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0033] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] In the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Furthermore, the term "multiple" mentioned in the embodiments of this application should be interpreted as two or more.

[0036] With the increasing popularity of cars and their growing intelligence, users are spending more time in their vehicles, leading to a wider variety of in-car entertainment options. Different passengers have different needs, such as resting, watching movies, and listening to music. Traditional car audio systems are holistic, with different speakers working together to create a sound field in which all passengers are immersed.

[0037] To address the personalized entertainment needs of passengers, multiple independent sound fields need to be constructed around each passenger in their respective seats. Related technologies involve installing independently emitting headrest speakers in each seat to achieve zoning of the car's audio system. However, the sound quality provided by this method is unsatisfactory. The applicant has found that the size of the headrest speakers is limited by the structure of the headrest and seat, typically using a diameter of 40 to 60 millimeters (mm). Due to this diameter, their bandwidth is generally between 200 and 20,000 Hz, failing to emit ultra-low frequencies below 200Hz, resulting in a lack of audio and a poor sound experience. Therefore, it is necessary to consider a new method for zoning and controlling the sound field in the vehicle cabin.

[0038] To address the aforementioned issue of poor sound quality, this application's embodiment employs door speakers for sound playback in the current sound field area. These door speakers are located in the car doors, and due to ample space, a diameter of 130 to 200 mm can be selected. Correspondingly, their bandwidth can cover 50 to 20000 Hz, thereby improving playback quality. Furthermore, considering that the sound waves from the door speakers inevitably diffuse into other sound field areas, affecting the listening experience of listeners in those areas, this application's embodiment also uses speakers at the headrests to cancel out interfering sound waves from other sound field areas. This improves the acoustic isolation between sound field areas, effectively dividing the vehicle cabin sound field and thus enhancing the sound quality experience of each independent sound field.

[0039] refer to Figure 1 , Figure 1 The schematic diagram illustrates an application scenario provided according to an embodiment of this application. The application scenario shows the system architecture of a cabin sound field zoning control system, which includes a controller 1, a cabin 2, a headrest 3, a cancelling speaker 4 mounted on the headrest 3, and a door speaker 5 mounted on the door.

[0040] Figure 1 Taking the two rows of four seats in the cockpit of the Sino-Israeli version 2 as an example, based on the regional position of each seat, the cockpit area is proposed to be divided into four sound field zones, such as... Figure 1The dashed line divides the cabin area into four sound field zones. Each seat has a door speaker 5 installed on the door adjacent to it, which plays audio for the sound field zone where that seat is located. Each seat's headrest has two canceling speakers 4, which cancel out interference sound waves diffused from other sound field zones for that seat's sound field zone.

[0041] When performing cabin sound field zoning control, the controller 1 controls the door speaker 5 of the target sound field zone to play the audio to be played in the target sound field zone based on the cabin sound field zoning control method provided in the embodiments of this application, and controls the cancelling speaker 4 of the target sound field zone to output the anti-phase cancelling sound wave that can cancel the interference sound wave diffused from the non-target sound field zone to the target sound field zone.

[0042] Here, the target sound field area can be any sound field area within the cabin, while the non-target sound field area refers to any other sound field area within the cabin besides the target sound field area. Understandably, the prerequisite for outputting anti-phase cancelling sound waves is the generation of interfering sound waves. That is, at least one non-target sound field area must be playing audio and generating interfering sound waves to the target sound field area before it becomes necessary to cancel the interfering sound waves.

[0043] The following is combined Figure 1 Application scenarios, refer to Figures 2-4 This application describes a cockpit sound field zoning control method according to exemplary embodiments thereof. It should be noted that the above application scenarios are shown only to facilitate understanding of the spirit and principles of this application, and the embodiments of this application are not limited in any way. Rather, the embodiments of this application can be applied to any applicable scenario.

[0044] refer to Figure 2 , Figure 2 This is a schematic flowchart illustrating a cockpit sound field zoning control method provided in an embodiment of this application. This method can be implemented using a computer program, such as application software. The executing entity of this method can be a cockpit sound field zoning control device integrated with or installed with the relevant computer program. This executing entity can also be a medium storing the relevant computer program, such as a cloud drive or portable hard drive; alternatively, the executing entity can be implemented using a physical device integrated with or installed with the relevant computer program, such as a computer or server. The following description uses a vehicle controller as an example of the executing entity.

[0045] In the cabin sound field zoning control method of this application embodiment, the cabin includes multiple sound field zones; each sound field zone is determined based on the regional position of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door corresponding to the sound field zone.

[0046] Optionally, an independent sound field zone can be created for each seat; considering that the seating layout of some vehicle models is relatively compact, multiple seats can also be divided into the same sound field zone. In this embodiment, the number of seats in each sound field zone is not limited. In real-world vehicle applications, the distribution of sound field zones can be designed based on vehicle conditions such as seat layout and cabin structure, and multiple sound field zone distribution modes can be configured for users to choose from.

[0047] Here, for vehicles that are originally equipped with headrest speakers, the cabin sound field zoning control method provided in this application allows for the addition of door speakers to widen the audio width range. In addition, the door speakers and headrest speakers work together to achieve a multi-directional stereo playback effect and improve the sound experience.

[0048] It should be noted that the aforementioned headrest speakers are mostly located on the front side of the seat headrest, facing the occupant's head in the current sound field area, so that the occupant can hear the audio more clearly; the left and right speakers provided in this application embodiment for canceling interference sound waves are located on both sides of the seat headrest and can be configured to face other sound field areas to facilitate the cancellation of interference sound waves and create an independent sound field area.

[0049] like Figure 2 As shown, the cockpit sound field zoning control method includes the following steps: S201. Based on the first target audio to be played in the target sound field area, control the door speakers corresponding to the target sound field area to play the audio.

[0050] In this step, based on the aforementioned analysis, it is known that the door speakers improve audio quality through a wider bandwidth. Optionally, according to the individual needs of the occupants, a first target audio to be played is pre-configured for the target sound field area where the occupant is located. Then, the controller drives the door speakers in that sound field area to play the preset audio content by executing step S201, thereby achieving independent control of the audio content played in each sound field area.

[0051] S202. Obtain the interference sound waves diffused from the door speakers of the remaining non-target sound field areas (excluding the target sound field area) to the target sound field area.

[0052] Here, the number of non-target sound field regions can be one or more. Figure 1 For example, there are four sound field zones, one of which is designated as the target sound field zone, and the remaining three are non-target sound field zones. It should be noted that at least one of the three non-target sound field zones will generate interfering sound waves to the target sound field zone.

[0053] Optionally, interference sound waves generated by non-target sound field areas on target sound field areas can be acquired in real time using sound wave acquisition devices, such as microphones; alternatively, a sound wave analysis model can be established to predict the interference sound waves generated by the audio content played in the non-target sound field areas on the target sound field areas, given the known audio content played in the non-target sound field areas.

[0054] If there are multiple non-target sound field regions generating interfering sound waves, considering their different propagation paths, this step requires acquiring the interfering sound waves propagating from multiple non-target sound field regions to the target sound field region. Optionally, the interfering sound waves propagating from each non-target sound field region to the target sound field region can be acquired sequentially, and then fused to obtain the combined interfering sound waves propagating from multiple non-target sound field regions to the target sound field region; alternatively, the combined interfering sound waves generated by multiple non-target sound field regions to the target sound field region can be acquired directly.

[0055] S203. Based on the interference sound wave, control at least one of the left and right speakers in the target sound field area to output an anti-phase canceling sound wave.

[0056] In this step, by inverting the phase of the interfering sound wave obtained in step S202 by 180 degrees, the effect of weakening or eliminating the interfering sound wave can be achieved. To improve the noise reduction effect, the amplitude or frequency can be further fine-tuned.

[0057] Here, if there are multiple non-target sound field regions generating interfering sound waves, optionally, corresponding anti-phase canceling sound waves can be generated based on the interfering sound waves diffused from each non-target sound field region to the target sound field region. These anti-phase canceling sound waves are then superimposed and integrated, and output by at least one of the left and right speakers. Alternatively, anti-phase canceling sound waves can be generated based on the combined interfering sound waves generated by multiple non-target sound field regions on the target sound field region, and output by at least one of the left and right speakers.

[0058] This step includes three methods for cancelling interfering sound waves: controlling one of the left and right speakers to cancel the interfering sound waves, or controlling both speakers together to cancel the interfering sound waves. This is because the sources of the interfering sound waves are different, and some non-target sound field areas may not be playing audio, meaning they do not generate interfering sound waves. Therefore, the speaker closer to the source of the interfering sound waves can be selected for noise cancellation to improve the noise reduction effect. For example, if some non-target sound field areas are not playing audio, and the interfering sound waves mainly originate from the right side near the headrest, the right speaker can be selected to output an inverse-phase cancelling sound wave. Optionally, the controller selects to drive either the left or right speaker to output an inverse-phase cancelling sound wave by obtaining the relative position of the non-target sound field area playing audio to the target sound field area.

[0059] In some application scenarios, occupants in the target sound field area do not require audio playback. In order to prevent non-target sound field areas from spreading interference sound waves to the target sound field area and disturbing the occupants in the target sound field area, the cockpit sound field zoning control method provided in this application embodiment can still be used. At least one of the left and right speakers can be used to cancel out the interference sound waves spreading from the non-target sound field area to the target sound field area by using anti-phase sound waves, thereby maintaining the quiet effect of the target sound field area.

[0060] In this embodiment, audio is played through the door speakers. Compared to playing audio through the headrest speakers, the door speakers have a larger diameter and a wider bandwidth coverage, which is beneficial to improving the sound effect experience in the target sound field area. The left and right speakers located on both sides of the headrest cancel out the interference sound waves generated by the door speakers playing audio in other sound field areas at different locations. This can effectively improve the acoustic isolation of the target sound field area, achieve precise zoning of the cabin sound field, and allow listeners in each sound field area to hear the audio content of their area more clearly and independently, further improving the sound effect experience.

[0061] The following reference Figure 3 and Figure 4 The generation method of antiphase canceling sound waves is explained. Figure 3 This is a flowchart illustrating a cockpit sound field zoning control method provided in another embodiment of this application. Figure 4 This is a schematic diagram of the propagation path of an interfering sound wave provided in an embodiment of this application.

[0062] like Figure 3 As shown, the method includes: S301. Based on the first target audio to be played in the target sound field area, control the door speakers corresponding to the target sound field area to play the audio.

[0063] In this step, based on the individual needs of the occupants, a first target audio to be played is pre-configured for the target sound field area where the occupant is located. This is achieved by driving the door speakers in that sound field area to play the preset audio content, thus realizing independent control of the audio content played in each sound field area. As the aforementioned analysis shows, the door speakers improve audio playback quality through a wider bandwidth.

[0064] In some optional implementations, the interference sound waves diffused by the door speakers corresponding to the remaining non-target sound field areas (excluding the target sound field area) in multiple sound field areas are obtained, including steps S302 and S303.

[0065] S302. For each non-target sound field area, acquire the second target audio to be played from the door speakers of the non-target sound field area.

[0066] Here, the second target audio and the first target audio in step S301 are both audio to be played that are pre-configured in the sound field area where the occupant is located according to the occupant's personalized needs. The preset audio content is played by driving the door speakers in the sound field area where the occupant is located, thereby realizing independent control of the audio content played in each sound field area.

[0067] In this step, the second target audio to be played from the door speaker in the non-target sound field area is obtained for subsequent use in step S303 to obtain the interference sound wave.

[0068] S303. Based on the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area, the second target audio is processed to obtain the interference sound wave diffused by the door speaker corresponding to the non-target sound field area to the target sound field area.

[0069] Understandably, the second target audio is played from the door speakers in the non-target sound field area. As it propagates to the target sound field area, the sound wave diffuses, causing sound pressure attenuation. Therefore, it is necessary to determine the actual sound wave when the second target audio propagates to the target sound field area based on the sound pressure attenuation ratio.

[0070] Using the implementation methods of steps S302 and S303, when processing interference sound waves from multiple non-target sound field regions, since the sound pressure attenuation ratio of each non-target sound field region relative to the target sound field region is different, it is necessary to process the interference sound waves separately for each non-target sound field region.

[0071] In the above embodiments, by acquiring the original audio to be played from the non-target sound field area and processing it in conjunction with the sound pressure attenuation ratio, the interference sound waves propagating from the non-target sound field area to the target sound field area can be predicted more accurately. Compared with using an acoustic sensor array to detect interference sound waves in real time, this method simplifies the structure, saves costs, and improves the feasibility of detecting interference sound waves.

[0072] Here, an implementation method using an acoustic sensor array to detect interfering sound waves in real time is adopted. When dealing with interfering sound waves from multiple non-target sound field regions, the interfering sound waves detected by the acoustic sensor array are the result of the combined effect of multiple non-target sound field regions.

[0073] Regarding the determination of the sound pressure attenuation ratio, in some embodiments, an empirical or theoretical value is used to set the sound pressure attenuation ratio; in other embodiments, a test wave is used to test in an actual vehicle to determine the sound pressure attenuation ratio. Optionally, before step S303 processes the second target audio based on the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound wave diffused by the door speaker corresponding to the non-target sound field area to the target sound field area, it includes: (1) Control the door speakers corresponding to the non-target sound field area to output preset sound waves. The preset sound wave can be an acoustic test signal, such as pink noise.

[0074] (2) Detect the sound wave that has diffused to the preset position of the target sound field area.

[0075] Optionally, the target sound field area can be preset in the center of the seat headrest, or in the location of the left or right speaker, or in the range of the occupant's head. All of the above location selections are around the occupant's auditory organs to ensure sound wave cancellation effect.

[0076] Optionally, a sound wave acquisition device, such as a microphone, can be set at a preset location to acquire sound waves that diffuse to the preset location.

[0077] (3) Determine the sound pressure attenuation ratio based on the preset sound wave and the sound wave that diffuses to the preset position of the target sound field area.

[0078] Optionally, the sound pressure at the preset sound wave at the door speaker location is compared with the sound pressure diffused to the preset location of the target sound field area to obtain the sound pressure attenuation ratio.

[0079] Reference Figure 4 Taking the center point A of the headrest 3 of the seat as an example, the door speakers 5 are divided into left front door speaker FL, right front door speaker FR, left rear door speaker RL, and right rear door speaker RR. Among them, P represents the sound pressure attenuation ratio, T represents the propagation delay, subscript 1 corresponds to left rear door speaker RL, subscript 2 corresponds to right rear door speaker RR, and subscript 3 corresponds to right front door speaker FR.

[0080] For example, taking the sound field area where the left front door speaker FL is located as the target sound field area, the right front door speaker FR, the left rear door speaker RL and the right rear door speaker RR are controlled to output pink noise in sequence. A microphone is set at point A to collect the sound waves of the pink noise diffused to the preset position of the target sound field area, and then the sound pressure attenuation ratio P1 of the right front door speaker FR, the sound pressure attenuation ratio P2 of the left rear door speaker RL and the sound pressure attenuation ratio P3 of the right rear door speaker RR are obtained respectively.

[0081] By adjusting the sound pressure level of the second target audio to be played from the right front door speaker FR based on the corresponding sound pressure attenuation ratio, the interference sound wave formed by the audio output from the right front door speaker FR diffused to point A can be obtained. Figure 4 As shown, assume that the first target audio to be played by the left rear door speaker RL is represented by S. RL Then, the interference sound wave formed by the left rear door speaker RL spreading to point A is represented by W1=P1×S. RLSimilarly, suppose the first target audio to be played by the right rear door speaker RR is represented by S. RR We can obtain the interference sound wave W2=P2×S formed by the audio output of the right rear door speaker RR spreading to point A. RR Assume the first target audio to be played by the right front door speaker FR is represented by S. FR The interference sound wave W3 = P3 × S generated by the audio output of the right front door speaker FR spreading to point A can be obtained. FR .

[0082] The above-described implementation method for determining the sound pressure attenuation ratio takes into account the influence of the vehicle's internal structure on acoustic propagation, making the sound pressure attenuation ratio closer to reality, and thus enabling more accurate subsequent interference and cancellation of sound waves.

[0083] In some alternative implementations, based on the interfering sound wave, at least one of the left and right speakers in the target sound field area is controlled to output an anti-phase canceling sound wave, including steps S304 to S306.

[0084] S304. The interfering sound wave is inverted to generate an initial inverted canceling sound wave.

[0085] Here, by generating an acoustic wave signal with the opposite phase to the interference signal—that is, an initial inverted cancelling acoustic wave—the interference acoustic wave is weakened or eliminated when it encounters the interference acoustic wave. Optionally, an inverting circuit can be used to achieve the inversion of the interference acoustic wave.

[0086] S305. Based on the door speakers corresponding to the non-target sound field area, the time delay of the diffuse interference sound wave in the target sound field area is applied to the initial anti-phase cancellation sound wave.

[0087] To achieve sound wave cancellation, the anti-phase cancelling sound wave and the interfering sound wave must arrive at the preset position simultaneously. Based on the initial anti-phase cancelling sound wave generated in step S304, a delay is performed to ensure that the anti-phase cancelling sound wave emitted from the target sound field area is precisely aligned with the interfering sound wave in time and phase, thereby improving the sound wave cancellation effect.

[0088] like Figure 4 As shown, the distances between different door speakers and the target sound field area are different. With the speed of sound propagation remaining constant, the time it takes for the audio played by different door speakers to travel to the target sound field area is different.

[0089] Optionally, the propagation delay can be determined by controlling the door speaker to send a test signal wave and comparing the phase difference between the door speaker and the test signal wave at a preset position.

[0090] Optionally, the propagation time delay can also be calculated by measuring the propagation distance and combining it with the speed of sound. Step S305, based on the door speakers corresponding to the non-target sound field area, before delaying the initial anti-phase canceling sound wave, may include: (1) For each non-target sound field area, obtain the distance between the door speaker of the non-target sound field area and the preset position of the target sound field area.

[0091] Here, the distance between the door speakers in the non-target sound field area and the preset position in the target sound field area can be calculated using vehicle design parameters; alternatively, distance measurement equipment, such as a laser rangefinder, can be used to measure the distance on the actual vehicle.

[0092] (2) Based on the distance and the pre-stored sound speed, determine the time delay of the door speaker corresponding to the non-target sound field area to diffuse the interference sound wave to the target sound field area.

[0093] The above-described method of determining propagation delay by dividing the distance by the pre-stored speed of sound is simple and direct, reducing processing complexity compared to determining propagation delay by analyzing test signal waves. By utilizing the propagation delay, the initial antiphase cancelling sound wave and the interfering sound wave arrive at the preset position simultaneously, achieving the effect of sound wave cancellation.

[0094] Reference Figure 4 By dividing the distance by the pre-stored speed of sound, we can obtain the propagation delay T1 of the right front door speaker FR, the propagation delay T2 of the left rear door speaker RL, and the propagation delay T3 of the right rear door speaker RR.

[0095] For example, the process of cancelling the interference sound wave generated by the right rear door speaker RR is as follows: the interference sound wave W2 generated by the right rear door speaker RR is inverted and delayed by T2, resulting in an inverted canceled sound wave that can be expressed as (-W2) × f(T2). Here, -W2 represents the inversion of the interference sound wave W2 generated by the right rear door speaker RR, and f(T2) represents the delay output control function for the interference sub-sound wave W2 generated by the right rear door speaker RR. (-W2) × f(T2) means that after time T2 of the right rear door speaker RR playing audio, the left or right speaker in the target sound field outputs an inverted canceled sound wave (-W2).

[0096] S306. Control at least one of the left and right loudspeakers in the target sound field area to output a delayed, phase-inverted canceled sound wave.

[0097] This step includes three methods for cancelling interfering sound waves: controlling one of the left and right speakers to cancel the interfering sound waves, or controlling both speakers together to cancel the interfering sound waves. This is because the sources of the interfering sound waves are different, and some non-target sound field areas may not be playing audio, meaning they do not generate interfering sound waves. Therefore, the speaker closer to the source of the interfering sound waves can be selected for noise cancellation to improve the noise reduction effect. For example, if some non-target sound field areas are not playing audio, and the interfering sound waves mainly originate from the right side near the headrest, the right speaker can be selected to output an inverse-phase cancelling sound wave. Optionally, the controller selects to drive either the left or right speaker to output an inverse-phase cancelling sound wave by obtaining the relative position of the non-target sound field area playing audio to the target sound field area.

[0098] In some optional implementations, the remaining non-target sound field area includes a non-target sound field area on the same side as the target sound field area and a non-target sound field area on the opposite side of the target sound field area. The interfering sound waves include a first interfering sound wave diffused into the target sound field area by the door speaker corresponding to the non-target sound field area on the same side as the target sound field area, and a second interfering sound wave diffused into the target sound field area by the door speaker corresponding to the non-target sound field area on the opposite side of the target sound field area.

[0099] Reference Figure 4 The target sound field area is defined as the sound field area where the left front door speaker FL is located, and the sound field area where the left rear door speaker RL is located is on the same side as the target sound field area; the sound field areas where the right front door speaker FR and the right rear door speaker RR are located are on the opposite side of the target sound field area. The first interference sound wave originates from the left rear door speaker RL; the second interference sound wave originates from the right front door speaker FR and / or the right rear door speaker RR.

[0100] Here, if the right front door speaker FR does not play audio, the second interference sound wave originates from the right front door speaker FR; if the right rear door speaker RR does not play audio, the second interference sound wave originates from the right rear door speaker RR. If both the right front door speaker FR and the right rear door speaker RR play audio, the second interference sound wave originates from both the right front door speaker FR and the right rear door speaker RR.

[0101] Step S306, based on the interfering sound wave, controls at least one of the left and right loudspeakers in the target sound field area to output an anti-phase canceling sound wave, including: Based on the first and second interference sound waves, the left and right loudspeakers in the target sound field area are controlled to output anti-phase canceling sound waves.

[0102] The above implementation method is applied to scenarios where interfering sound waves originate from different directions, including both a first interfering sound wave from a non-target sound field area on the same side and a second interfering sound wave from a non-target sound field area on the opposite side. In this scenario, by considering the distribution positions of the left and right speakers, the left and right speakers can be flexibly configured to cancel out the first and second interfering sound waves respectively. Optionally, the left speaker can be controlled to cancel out the first interfering sound wave, and the right speaker can be controlled to cancel out the second interfering sound wave; or, the left speaker can be controlled to cancel out the second interfering sound wave, and the right speaker can be controlled to cancel out the first interfering sound wave. The above implementation method, by controlling the left and right speakers to perform targeted sound wave cancellation, helps to improve the sound field isolation effect.

[0103] In some optional implementations, based on the first and second interfering sound waves, the left and right loudspeakers in the target sound field area are controlled to output anti-phase canceling sound waves, including: (1) If the target sound field area is located on the left side of the cockpit, the left loudspeaker in the target sound field area is controlled to output a first anti-phase canceling sound wave based on the first interference sound wave, and the right loudspeaker in the target sound field area is controlled to output a second anti-phase canceling sound wave based on the second interference sound wave. (2) If the target sound field area is located on the right side of the cockpit, the right loudspeaker in the target sound field area is controlled to output a first anti-phase canceling sound wave based on the first interference sound wave, and the left loudspeaker in the target sound field area is controlled to output a second anti-phase canceling sound wave based on the second interference sound wave.

[0104] Understandably, choosing a speaker closer to the source of the interfering sound waves for sound wave cancellation is more in line with the physical laws of acoustic propagation, reduces the long-distance propagation of the anti-phase cancellation sound waves, and results in a better cancellation effect, thereby improving the audio experience.

[0105] Combination Figure 1 and Figure 4 If the target sound field area is located on the left side of the cabin, the left speaker is closer to the door speaker in the non-target sound field area on the same side, and the right speaker is closer to the door speaker in the non-target sound field area on the opposite side. Therefore, the left speaker in the target sound field area is controlled to output a first anti-phase cancelling sound wave to cancel the first interference sound wave generated by the non-target sound field area on the same side; the right speaker in the target sound field area is controlled to output a second anti-phase cancelling sound wave to cancel the second interference sound wave generated by the non-target sound field area on the opposite side. Similarly, the configuration method of the left and right speakers when the target sound field area is located on the right side of the cabin can be deduced.

[0106] In the above embodiments, during the generation of the first anti-phase canceling sound wave and the second anti-phase canceling sound wave, reference can be made to... Figure 3 Steps S302 to S305 are not described in detail here.

[0107] In some optional implementations, there are multiple non-target sound field areas opposite the target sound field area, and the second interference sound wave includes multiple second interference sub-sound waves. If the target sound field area is located on the left side of the cockpit, based on the second interference sound wave, the right loudspeaker in the target sound field area is controlled to output a second anti-phase cancelling sound wave, including: (1) Generate a corresponding second sub-phase anti-cancellation acoustic wave based on each second interference sub-acoustic wave; (2) Multiple second-phase anti-cancelling sound waves are superimposed to obtain a second anti-phase anti-cancelling sound wave; (3) Control the right loudspeaker in the target sound field area to output the second anti-phase canceling sound wave.

[0108] Reference Figure 4 In a scenario where the sound field area where the left front door speaker FL is located is the target sound field area, and audio is played in two non-target sound field areas opposite the target sound field area, the second interference sub-sound wave generated by the right rear door speaker RR is represented as W2=P2×S. RR The second interference wave generated by the right front door speaker FR is represented as W3 = P3 × S. FR The two second interfering sound waves are inverted and superimposed to generate a second inverted cancelling sound wave, which can be expressed as (-W2)×f(T2)+(-W3)×f(T3). This means that after time T2 when the right rear door speaker RR plays audio, the right speaker outputs an inverted cancelling sound wave (-W2). After time T3 when the right front door speaker FR plays audio, the right speaker outputs an inverted cancelling sound wave (-W3).

[0109] This approach combines the actual sound field distribution of the cockpit with consideration of the case where there are multiple non-target sound field areas on the opposite side. By superimposing the separately generated sub-phase canceling sound waves, multiple interfering sound waves can be processed simultaneously, ensuring the independence of each sound field area and improving the audio experience.

[0110] This embodiment of the application plays audio through the door speakers. Compared with the headrest speakers, the door speakers have a larger diameter and a wider bandwidth coverage, which is beneficial to improving the sound effect experience in the target sound field area. The left and right speakers set on both sides of the headrest cancel out the interference sound waves generated by the door speakers playing audio in different sound field areas, which can effectively improve the acoustic isolation of the target sound field area, realize the precise zoning of the cabin sound field, and enable the listeners in each sound field area to hear the audio content of their area more clearly and independently, further improving the sound effect experience.

[0111] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0112] An embodiment of this application also provides a cabin sound field zoning control system, wherein the cabin includes multiple sound field zones; each sound field zone is determined based on the regional position of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door near the corresponding sound field zone; the controller is configured to execute the aforementioned cabin sound field zoning control method.

[0113] For example, the architecture of this cockpit sound field zoning control system can refer to Figure 1 The system includes a controller 1, a cabin 2, a headrest 3, a cancelling speaker 4 mounted on the headrest 3, and a door speaker 5 mounted on the door. The controller 1 is configured to execute the aforementioned cabin sound field zoning control method.

[0114] Figure 1 Taking the two rows of four seats in the cockpit of the Sino-Israeli version 2 as an example, based on the regional position of each seat, the cockpit area is proposed to be divided into four sound field zones, such as... Figure 1 The dashed line divides the cabin area into four sound field zones. Each seat has a door speaker 5 installed on the door adjacent to it, which plays audio for the sound field zone where that seat is located. Each seat's headrest has two canceling speakers 4, which cancel out interference sound waves diffused from other sound field zones for that seat's sound field zone.

[0115] One embodiment of this application also provides a vehicle equipped with the aforementioned cabin sound field zoning control system.

[0116] Figure 5 This is a schematic diagram of the structure of a cockpit sound field zoning control device provided in one embodiment of this application. Figure 5 As shown, the cabin sound field zoning control device provided in this embodiment is applied to a vehicle. The vehicle cabin includes multiple sound field zones; each sound field zone is determined based on the location of at least one seat in the cabin, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door near the corresponding sound field zone. The device may include: a playback module 501 and a cancellation module 502.

[0117] The playback module 501 is used to control the door speakers corresponding to the target sound field area to play audio according to the first target audio to be played in the target sound field area. The cancellation module 502 is used to acquire the interference sound waves diffused from the target sound field area by the door speakers corresponding to the remaining non-target sound field areas in multiple sound field areas, excluding the target sound field area. The cancellation module 502 is also used to control at least one of the left and right speakers in the target sound field area to output an anti-phase cancellation sound wave based on the interference sound wave.

[0118] In one possible implementation, the cancellation module 502 is used to acquire the second target audio to be played from the door speaker of the non-target sound field area for each non-target sound field area; the cancellation module 502 is also used to process the second target audio according to the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound wave diffused by the door speaker of the non-target sound field area to the target sound field area.

[0119] In one possible implementation, before processing the second target audio according to the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound wave diffused from the door speaker corresponding to the non-target sound field area to the target sound field area, the cancellation module 502 is further used to control the door speaker corresponding to the non-target sound field area to output a preset sound wave; the cancellation module 502 is further used to detect the sound wave diffused to a preset position in the target sound field area; the cancellation module 502 is further used to determine the sound pressure attenuation ratio according to the preset sound wave and the sound wave diffused to the preset position in the target sound field area.

[0120] In one possible implementation, the cancellation module 502 is further configured to invert the interfering sound wave to generate an initial inverted cancellation sound wave; the cancellation module 502 is further configured to delay the initial inverted cancellation sound wave based on the time delay of the interfering sound wave spreading in the target sound field area according to the door speaker corresponding to the non-target sound field area; the cancellation module 502 is further configured to control at least one of the left speaker and the right speaker in the target sound field area to output the delayed inverted cancellation sound wave.

[0121] In one possible implementation, before delaying the initial antiphase cancellation sound wave based on the time delay of the door speaker corresponding to the non-target sound field area for the diffuse interference sound wave in the target sound field area, the following steps are taken: the cancellation module 502 is further configured to obtain the distance between the door speaker of the non-target sound field area and the preset position of the target sound field area for each non-target sound field area; the cancellation module 502 is further configured to determine the time delay of the door speaker corresponding to the non-target sound field area for the diffuse interference sound wave in the target sound field area based on the distance and the pre-stored sound velocity.

[0122] In one possible implementation, the remaining non-target sound field area includes the non-target sound field area on the same side as the target sound field area and the non-target sound field area on the opposite side of the target sound field area; the interfering sound waves include the door speaker corresponding to the non-target sound field area on the same side as the target sound field area, the first interfering sound wave that diffuses into the target sound field area, and the door speaker corresponding to the non-target sound field area on the opposite side of the target sound field area, the second interfering sound wave that diffuses into the target sound field area; the cancellation module 502 is specifically used to control the left speaker and the right speaker in the target sound field area based on the first interfering sound wave and the second interfering sound wave, and output the anti-phase cancellation sound wave.

[0123] In one possible implementation, the cancellation module 502 is specifically configured to, if the target sound field area is located on the left side of the cockpit, control the left speaker in the target sound field area to output a first anti-phase cancellation sound wave based on the first interference sound wave, and control the right speaker in the target sound field area to output a second anti-phase cancellation sound wave based on the second interference sound wave; the cancellation module 502 is also specifically configured to, if the target sound field area is located on the right side of the cockpit, control the right speaker in the target sound field area to output a first anti-phase cancellation sound wave based on the first interference sound wave, and control the left speaker in the target sound field area to output a second anti-phase cancellation sound wave based on the second interference sound wave.

[0124] In one possible implementation, there are multiple non-target sound field areas opposite the target sound field area, and the second interference sound wave includes multiple second interference sub-sound waves. If the target sound field area is located on the left side of the cockpit, the cancellation module 502 is specifically used to generate a corresponding second sub-antiphase cancellation sound wave based on each second interference sub-sound wave. The cancellation module 502 is also specifically used to superimpose multiple second sub-antiphase cancellation sound waves to obtain a second antiphase cancellation sound wave. The cancellation module 502 is also specifically used to control the right loudspeaker in the target sound field area to output the second antiphase cancellation sound wave.

[0125] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0126] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0127] An embodiment of this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described cockpit sound field zoning control method.

[0128] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0129] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0130] In the embodiments provided in this application, it should be understood that the disclosed devices / vehicles and methods can be implemented in other ways. For example, the device / vehicle embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0131] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0132] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0133] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0134] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for controlling the sound field zoning of a cockpit, characterized in that, The cockpit includes multiple sound field zones; each sound field zone is determined based on the location of at least one seat within the cockpit, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door corresponding to the sound field zone; the method includes: Based on the first target audio to be played in the target sound field area, control the door speakers corresponding to the target sound field area to play the audio. Obtain the interference sound waves diffused from the target sound field area by the door speakers corresponding to the remaining non-target sound field areas among the plurality of sound field areas; Based on the interference sound wave, at least one of the left and right speakers in the target sound field area is controlled to output an anti-phase canceling sound wave.

2. The cockpit sound field zoning control method according to claim 1, characterized in that, The step of acquiring the door speakers corresponding to the remaining non-target sound field areas (excluding the target sound field area) among the plurality of sound field areas, and the interference sound waves diffused into the target sound field area by the speakers, includes: For each non-target sound field area, obtain the second target audio to be played from the door speakers of the non-target sound field area; Based on the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area, the second target audio is processed to obtain the interference sound wave diffused by the door speaker corresponding to the non-target sound field area to the target sound field area.

3. The cockpit sound field zoning control method according to claim 2, characterized in that, Before processing the second target audio based on the sound pressure attenuation ratio of the non-target sound field area relative to the target sound field area to obtain the interference sound wave diffused from the door speaker corresponding to the non-target sound field area to the target sound field area, the process includes: Control the door speakers in non-target sound field areas to output preset sound waves; Detect the sound wave that has diffused to a preset position in the target sound field area; The sound pressure attenuation ratio is determined based on the preset sound wave and the sound wave that diffuses to a preset position in the target sound field area.

4. The cockpit sound field zoning control method according to any one of claims 1 to 3, characterized in that, The step of controlling at least one of the left and right loudspeakers in the target sound field region to output an anti-phase canceling sound wave based on the interfering sound wave includes: The interfering acoustic wave is inverted to generate an initial inverted cancelling acoustic wave; Based on the door speaker corresponding to the non-target sound field area, the time delay of the diffuse interference sound wave in the target sound field area is used to delay the initial anti-phase canceling sound wave; Control at least one of the left and right loudspeakers in the target sound field area to output a delayed, phase-inverted canceled sound wave.

5. The cockpit sound field zoning control method according to claim 4, characterized in that, The method for delaying the diffuse interference sound wave in the target sound field area based on the door speaker corresponding to the non-target sound field area, before delaying the initial anti-phase canceling sound wave, includes: For each non-target sound field area, obtain the distance between the door speaker in the non-target sound field area and the preset position of the target sound field area; Based on the distance and the pre-stored sound velocity, determine the time delay of the door speaker corresponding to the non-target sound field area to diffuse the interference sound wave to the target sound field area.

6. The cockpit sound field zoning control method according to any one of claims 1 to 3, characterized in that, The remaining non-target sound field area includes the non-target sound field area on the same side as the target sound field area, and the non-target sound field area on the opposite side of the target sound field area; the interfering sound wave includes a first interfering sound wave that diffuses into the target sound field area from the door speaker corresponding to the non-target sound field area on the same side as the target sound field area, and a second interfering sound wave that diffuses into the target sound field area from the door speaker corresponding to the non-target sound field area on the opposite side of the target sound field area; The step of controlling at least one of the left and right loudspeakers in the target sound field region to output an anti-phase canceling sound wave based on the interfering sound wave includes: Based on the first interference sound wave and the second interference sound wave, the left and right loudspeakers in the target sound field area are controlled to output anti-phase canceling sound waves.

7. The cockpit sound field zoning control method according to claim 6, characterized in that, The step of controlling the left and right loudspeakers in the target sound field region to output anti-phase canceling sound waves based on the first and second interference sound waves includes: If the target sound field area is located on the left side of the cockpit, then based on the first interference sound wave, the left speaker in the target sound field area is controlled to output a first anti-phase canceling sound wave, and based on the second interference sound wave, the right speaker in the target sound field area is controlled to output a second anti-phase canceling sound wave. If the target sound field area is located on the right side of the cockpit, then based on the first interference sound wave, the right speaker in the target sound field area is controlled to output the first anti-phase canceling sound wave, and based on the second interference sound wave, the left speaker in the target sound field area is controlled to output the second anti-phase canceling sound wave.

8. The cockpit sound field zoning control method according to claim 7, characterized in that, There are multiple non-target sound field regions opposite the target sound field region, and the second interference sound wave includes multiple second interference sub-sound waves; If the target sound field area is located on the left side of the cockpit, the step of controlling the right speaker in the target sound field area to output a second anti-phase canceling sound wave based on the second interference sound wave includes: Based on each second interference sub-sound wave, a corresponding second sub-antiphase cancellation sound wave is generated; Multiple second-phase anti-cancelling sound waves are superimposed to obtain the second-phase anti-cancelling sound wave; Control the right loudspeaker in the target sound field area to output the second anti-phase canceling sound wave.

9. A cockpit sound field zoning control system, characterized in that, The cockpit includes multiple sound field zones; each sound field zone is determined based on the location of at least one seat in the cockpit, and a left speaker and a right speaker are provided on both sides of the headrest of each seat; wherein, for each sound field zone, a door speaker is provided on the door corresponding to the sound field zone. The system includes a controller configured to perform the cockpit sound field zoning control method as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle is equipped with a cabin sound field zoning control system as described in claim 9.

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