In-vehicle sound field optimization method, sound system, electronic device and storage medium

Abstract

The present application relates to the technical field of sound reproduction, and provides an in-vehicle sound field optimization method, a sound system, an electronic device, and a storage medium. According to the present application, an actual acoustic response at each seat in an automobile cabin to a preset audio signal played back by each loudspeaker is calculated, and an ideal acoustic response at a sweet spot in a listening room to the preset audio signal played back by each preset loudspeaker is calculated; on the basis that the actual acoustic response conforms to the ideal acoustic response, a sound field at each seat in the cabin is reconstructed to obtain a sound field reconstruction result at each seat, so that on the basis of the sound field reconstruction result at each seat, the sound system controls each loudspeaker to execute sound reproduction of an audio signal to be played back, and at the moment, the actual acoustic response at each seat conforms to the ideal acoustic response of the listening room, that is, the sound energy / sound field balance between the sound field size and the ears of a passenger can be achieved at each seat, ensuring the acoustic experience of the passenger at each seat in the cabin.

Description

In-vehicle sound field optimization method, sound system, electronic device and storage medium TECHNICAL FIELD

[0001] The present application relates to the technical field of sound playback, and particularly relates to an in-vehicle sound field optimization method, a sound system, an electronic device and a storage medium. BACKGROUND

[0002] A vehicle-mounted sound system is an important part of in-vehicle entertainment facilities, which can perform sound playback in the cabin of the automobile, thereby bringing excellent and immersive driving experience to the user. In the related art, the vehicle-mounted sound system includes a plurality of loudspeakers arranged at different positions in the cabin, each loudspeaker can emit an audio signal to be played back, and the sound playback of the audio signal in the cabin can be realized through the cooperation of the loudspeakers. Generally, the physical layout of the loudspeakers in the cabin is greatly different from the ideal sound system of a listening room, and the position of the passenger in the cabin is also not the ideal listening position in the listening room. In this case, to ensure the sound energy / sound field balance between the ears of the passenger, the size of the sound field must be sacrificed, and to ensure the size of the sound field, the sound energy / sound field balance between the ears of the passenger cannot be ensured, and the sound field will have obvious discontinuity, that is, the vehicle-mounted sound system cannot balance the size of the sound field and the sound energy / sound field balance between the ears of the passenger, which undoubtedly reduces the acoustic experience of the passenger in the cabin, and therefore it is necessary to improve the existing sound playback scheme in the vehicle. TECHNICAL PROBLEM

[0003] The present application provides an in-vehicle sound field optimization method, a sound system, an electronic device and a storage medium, which aims to solve the problem that the vehicle-mounted sound system in the related art cannot balance the size of the sound field and the sound energy / sound field balance between the ears of the passenger. TECHNICAL SOLUTION

[0004] In order to solve the above technical problems in the related art, the first aspect of the present application provides an in-vehicle sound field optimization method applied to an audio system of a vehicle, the audio system being arranged in a cabin of the vehicle, the audio system comprising a plurality of loudspeakers arranged at different positions in the cabin, each loudspeaker being configured with a digital filter, and a plurality of seats being arranged in the cabin. Specifically, the in-vehicle sound field optimization method comprises: calculating an actual acoustic response at a target seat in the cabin according to a preset audio signal, an electro-acoustic transfer function of each loudspeaker, a first acoustic transfer function of each digital filter, and a second acoustic transfer function from each loudspeaker to the target seat in the cabin; calculating an ideal acoustic response at an optimal listening position in a listening room according to the preset audio signal, an ideal acoustic transfer function from each preset loudspeaker to the optimal listening position in the listening room, and an ideal electro-acoustic transfer function of each preset loudspeaker; reconstructing a sound field at the target seat according to the actual acoustic response and the ideal acoustic response, to obtain a sound field reconstruction result at the target seat; and collecting and storing the sound field reconstruction result at each seat.

[0005] The second aspect of the present application provides an audio system arranged in a cabin of a vehicle, comprising a domain controller and a plurality of loudspeakers arranged at different positions in the cabin and communicatively connected to the domain controller, the domain controller being configured to implement the in-vehicle sound field optimization method mentioned in the first aspect of the present application.

[0006] The third aspect of the present application provides an electronic device comprising a memory and a processor communicatively connected to the memory, the memory storing a computer program, and the processor being configured to call the computer program to implement the in-vehicle sound field optimization method mentioned in the first aspect of the present application.

[0007] The fourth aspect of the present application provides a computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being configured to be called by a processor to implement the in-vehicle sound field optimization method mentioned in the first aspect of the present application. Advantages

[0008] According to the above technical solutions of the present application, the actual acoustic response of each loudspeaker playing the preset audio signal at the target seat is calculated according to the preset audio signal, the electro-acoustic conversion transfer function of each loudspeaker, the first acoustic transfer function of each digital filter, and the second acoustic transfer function from each loudspeaker to the target seat, the ideal acoustic response of each preset loudspeaker playing the preset audio signal at the optimal listening position is calculated according to the preset audio signal, the ideal acoustic transfer function from each preset loudspeaker to the optimal listening position in the listening room, and the ideal electro-acoustic conversion transfer function of each preset loudspeaker, then the sound field at the target seat is reconstructed according to the correspondence between the actual acoustic response and the ideal acoustic response, and the sound field reconstruction result at the target seat is obtained, and finally the sound field reconstruction results at each seat are summarized and stored, so that the optimization of the sound field in the cabin can be completed. It can be understood that the sound field reconstruction at each seat in the cabin is based on the correspondence between the actual acoustic response and the ideal acoustic response, that is, the sound system can control each loudspeaker to perform sound playback of the to-be-played audio signal based on the sound field reconstruction result at each seat, at this time the actual acoustic response at each seat will correspond to the ideal acoustic response of the listening room, that is, for the passenger sitting on each seat, the sound energy / sound field between his / her ears is balanced, at the same time the size of the sound field at least corresponds to the physical layout of the loudspeakers in the cabin, and even breaks through the physical space limit of the cabin, and the sound field does not have obvious faults, so that the sound field size and the balance of sound energy / sound field between the passenger's ears are considered, and the acoustic experience of the passenger at each seat in the cabin is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the related art or the present application, the following will briefly introduce the drawings needed to be used in the description of the related art or the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and not all embodiments. Those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0010] FIG. 1 is a schematic diagram of the layout of loudspeakers in the cabin in the related art;

[0011] FIG. 2 is a schematic diagram of a kind of listening feeling of a passenger at a main driver seat in the related art;

[0012] FIG. 3 is a schematic diagram of another listening feeling of a passenger at a main driver seat in the related art;

[0013] FIG. 4 is a module block diagram of a sound system provided by the present application;

[0014] FIG. 5 is a schematic diagram of an environment of a listening room provided by the present application;

[0015] Fig. 6 is a schematic diagram of the listening experience of a passenger at the driver's seat according to an embodiment of the present application;

[0016] Fig. 7 is a schematic diagram of the layout of the loudspeakers in the cabin according to an embodiment of the present application;

[0017] Fig. 8 is a schematic diagram of the acoustic environment of a passenger at the driver's seat according to an embodiment of the present application;

[0018] Fig. 9 is a schematic diagram of the acoustic environment of a passenger at the front passenger's seat according to an embodiment of the present application;

[0019] Fig. 10 is a schematic diagram of the acoustic environment of a passenger at the left rear seat according to an embodiment of the present application;

[0020] Fig. 11 is a schematic diagram of the acoustic environment of a passenger at the right rear seat according to an embodiment of the present application;

[0021] Fig. 12 is a block diagram of the modules of the domain controller according to an embodiment of the present application;

[0022] Fig. 13 is a flowchart of the method of optimizing the sound field in the vehicle according to an embodiment of the present application. Embodiments of the present application

[0023] In order to make the objectives, technical solutions and advantages of the present application more obvious and easy to understand, the present application will be described below in detail with reference to the embodiments of the present application and the corresponding drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. It should be understood that the embodiments of the present application described below are only used to explain the present application and do not limit the present application, i.e. all other embodiments obtained by those skilled in the art without creative labor based on the embodiments of the present application fall within the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] In the related art, the physical layout of the loudspeakers in the cabin of the vehicle is greatly different from the ideal sound system of the listening room, and the position of the passengers in the cabin is not the ideal listening position in the listening room. In this case, to ensure the sound energy / sound field balance between the ears of the passengers, the size of the sound field must be sacrificed, and to ensure the size of the sound field, the sound energy / sound field balance between the ears of the passengers cannot be guaranteed, and there will be obvious faults in the sound field, that is, the existing vehicle audio system cannot balance the size of the sound field and the sound energy / sound field balance between the ears of the passengers, which undoubtedly reduces the acoustic experience of the passengers in the cabin.

[0025] In order to more clearly understand the above-mentioned drawbacks existing in the related art, please refer to FIG. 1, five loudspeakers (indicated as a, b, c, d, and e respectively) are arranged in the cabin of the automobile, the loudspeaker a is arranged at the center position of the center console, the loudspeaker b is arranged at the position close to the front of the right front door, the loudspeaker c is arranged at the position close to the front of the left front door, the loudspeaker d is arranged at the position close to the front of the right rear door, and the loudspeaker e is arranged at the position close to the front of the left rear door. Taking the passenger on the driver's seat as an example, the listening experience can be divided into two cases, that is, as shown in FIG. 2, the oval dashed box represents the range of the sound field perceived by the passenger, u, v, and w represent the left sound image position, the right sound image position, and the center sound image position perceived by the passenger respectively. It can be found from FIG. 2 that the left sound image position u and the right sound image position v are respectively located on the left and right sides of the passenger and have good symmetry, so as to ensure the balance of sound energy / sound field between the ears of the passenger. However, the size of the sound field is obviously smaller than the physical layout of the loudspeakers in the cabin, that is, the size of the sound field and the balance of sound energy / sound field between the ears of the passenger cannot be considered at the same time, thereby reducing the acoustic experience of the passenger. As shown in FIG. 3, the oval dashed box also represents the range of the sound field perceived by the passenger, u, v, and w also represent the left sound image position, the right sound image position, and the center sound image position perceived by the passenger respectively. It can be found from FIG. 3 that the size of the sound field is consistent with the physical layout of the loudspeakers in the cabin, but there is an obvious fault. Moreover, since the center sound image position w is located in front of the passenger, the left sound image position u is located on the left side of the passenger and is close to the passenger, and the right sound image position v is located on the right side of the passenger and is far away from the passenger, the balance of sound energy / sound field between the ears of the passenger is not balanced, that is, the size of the sound field and the balance of sound energy / sound field between the ears of the passenger cannot be considered at the same time, thereby reducing the acoustic experience of the passenger. Therefore, the in-cabin sound field optimization method and the sound system applying the in-cabin sound field optimization method are proposed in the embodiments below to avoid the above-mentioned drawbacks existing in the related art.

[0026] Fig. 4 is a module block diagram of an audio system, in some embodiments, the audio system 400 is arranged in a cabin of a vehicle, including a domain controller 410 and a plurality of speakers 420 respectively located at different positions in the cabin, each speaker 420 is in communication connection with the domain controller 410, the domain controller 410 can transmit the audio signal to be played to each speaker 420 in the cabin, so as to perform sound playback of the audio signal to be played in the cabin through each speaker 420, thereby bringing an excellent and immersive driving experience to the passengers. Generally, the cabin is formed by the vehicle body, for example, the vehicle doors (including but not limited to the left front door, the right front door, the left rear door, the right rear door), the windows, etc. are all parts of the vehicle body, and the cabin is also configured with a center console near the front of the vehicle, a storage table near the rear of the vehicle, and a plurality of seats between the center console and the storage table, each seat can be occupied by a passenger, such as the main driver seat, the co-driver seat, the rear left seat and the rear right seat, etc. The main driver seat and the co-driver seat are arranged side by side and adjacent to the center console, and the rear left seat and the rear right seat are arranged side by side and adjacent to the storage table. In addition, it should be noted that for a single speaker 420 at a certain position in the cabin, it is actually not limited to one, but can also be multiple, such as a two-way speaker module or a coaxial speaker module composed of two, a three-way speaker module composed of three, a speaker array composed of multiple, etc. The specific design can be carried out according to the actual needs, and the present application does not make a unique limitation.

[0027] Specifically, the domain controller 410 stores a computer program, which is essentially the in-vehicle sound field optimization method of the present application, that is, the domain controller 410 implements the in-vehicle sound field optimization method of the present application by executing the stored computer program. In the actual sound field optimization process, a digital filter is applied to each loudspeaker 420, and the actual acoustic response of the target seat to the playback of the preset audio signal by each loudspeaker 420 is calculated according to the preset audio signal, the electro-acoustic transfer function of each loudspeaker 420, the first acoustic transfer function of each digital filter, and the second acoustic transfer function of each loudspeaker 420 to the target seat in the cabin. Then, referring to FIG. 5, the ideal acoustic response of the optimal listening position 520 to the playback of the preset audio signal by each preset loudspeaker 510 is calculated according to the preset audio signal, the ideal acoustic transfer function of each preset loudspeaker 510 to the optimal listening position 520 in the listening room, and the ideal electro-acoustic transfer function of each preset loudspeaker 510. At this point, the sound field at the target seat can be reconstructed based on the actual acoustic response and the ideal acoustic response, and the sound field reconstruction result at the target seat is obtained. Finally, the sound field reconstruction results at each seat are summarized and stored, and the stored sound field reconstruction results at each seat are used for subsequent sound playback of the to-be-played audio signal by the domain controller 410 controlling each loudspeaker 420. In addition, it should be noted that the Listening area in FIG. 5 refers to the listening range of the user at the optimal listening position 520, and the radius refers to the radius r of the listening range L , r L ≤0.7m, θ=60°, B=2-3m, maximum 4m. It should be further noted that the in-vehicle sound field optimization method of the present application can also be implemented by an external electronic device (such as a computer), but after the electronic device obtains the sound field reconstruction result at each seat in the cabin, the sound field reconstruction result at each seat needs to be transmitted to the domain controller 410, and the domain controller 410 can store the received sound field reconstruction result at each seat, so as to facilitate subsequent sound playback of the to-be-played audio signal by each loudspeaker 420 based on the sound field reconstruction result at each seat.

[0028] It can be understood that the sound field reconstruction at each seat in the cabin is based on the actual acoustic response being consistent with the ideal acoustic response, that is, the sound system 400 can control the loudspeakers 420 to perform sound playback of the audio signal to be played based on the sound field reconstruction result at each seat, at this time the actual acoustic response at each seat will be consistent with the ideal acoustic response of the listening room, that is, for the passenger sitting on each seat, the sound energy / sound field between his / her ears is balanced, and the size of the sound field is at least consistent with the physical layout of the loudspeakers 420 in the cabin, and the sound field will not appear obvious fault, so as to realize the balance between the size of the sound field and the sound energy / sound field between the ears of the passenger, and improve the acoustic experience of the passenger at each seat in the cabin. In order to clearly understand the beneficial effects brought by the in-vehicle sound field optimization method of the present application, please see FIG. 6, still taking the passenger on the driver's seat as an example, the oval dashed line frame also represents the range of the sound field perceived by the passenger, u, v, w represent the left channel sound image position, right channel sound image position and center sound image position perceived by the passenger respectively, it can be found from FIG. 6 that after the sound field optimization by the in-vehicle sound field optimization method of the present application, the ideal acoustic environment of the listening room is fully restored, the left channel sound image position u and the right channel sound image position v perceived by the passenger are located on the left and right sides of the passenger respectively and have good symmetry, which ensures the balance of the sound energy / sound field between the ears of the passenger, and at the same time will not sacrifice the size of the sound field, that is, the size of the sound field will at least be consistent with the physical layout of the loudspeakers 420 in the cabin, so as to balance the size of the sound field and the sound energy / sound field between the ears of the passenger, and further improve the acoustic experience of the passenger at each seat in the cabin. In addition, it should be noted that although the present application is based on the actual acoustic response being consistent with the ideal acoustic response when reconstructing the sound field at each seat, after the sound field reconstruction is completed, the actual acoustic response at a single seat is not completely identical to the ideal acoustic response, the in-vehicle sound field optimization method of the present application is actually a process of seeking the optimal sound field reconstruction result at each seat, and finally makes the difference between the actual acoustic response and the ideal acoustic response at each seat be the smallest when the loudspeakers 420 perform sound playback of the audio signal to be played based on the optimal sound field reconstruction result at each seat.

[0029] As one of the embodiments, the process of calculating the actual acoustic response at the target seat by the domain controller 410 includes: obtaining the left channel sound source and the right channel sound source of the preset audio signal, and analyzing a first audio component with high correlation between the left channel sound source and the right channel sound source, a second audio component with low correlation between the left channel sound source and the right channel sound source in the left channel sound source, and a third audio component with low correlation between the right channel sound source and the left channel sound source in the right channel sound source; and calculating the actual acoustic response at the target seat according to the first audio component, the second audio component, the third audio component, the electro-acoustic conversion transfer function of each speaker 420, the first acoustic transfer function of each digital filter, and the second acoustic transfer function from each speaker 420 to the target seat in the cabin. Correspondingly, the process of calculating the ideal acoustic response at the best listening position 520 by the domain controller 410 includes: calculating the ideal acoustic response at the best listening position 520 according to the first audio component, the second audio component, the third audio component, the ideal acoustic transfer function from each preset speaker 510 in the listening room to the best listening position 520, and the ideal electro-acoustic conversion transfer function of each preset speaker 510.

[0030] In some implementations of the embodiment, as shown in FIG. 7, eight speakers 420 are configured in the cabin, which are a first speaker 421, a second speaker 422, a third speaker 423, a fourth speaker 424, a fifth speaker 425, a sixth speaker 426, a seventh speaker 427, and an eighth speaker 428. The first speaker 421 is located at the center of the center console, the second speaker 422 is located on one side of the center console and adjacent to the driver's seat, the third speaker 423 is located on the other side of the center console and adjacent to the front passenger seat, the fourth speaker 424 is located on the left front door of the car, the fifth speaker 425 is located on the right front door of the car, the sixth speaker 426 is located on the left rear door of the car, the seventh speaker 427 is located on the right rear door of the car, and the eighth speaker 428 is located between the left rear seat and the right rear seat. Taking the driver's seat as an example, the first speaker 421, the second speaker 422, the third speaker 423, the fourth speaker 424, and the fifth speaker 425 have the greatest impact on the sound field of the driver's seat. As for the sixth speaker 426, the seventh speaker 427, and the eighth speaker 428, they do not have no impact on the sound field, but have little impact. In actual modeling, they can be included in the calculation or not included in the calculation, which is determined by the design and development personnel according to the actual situation. The present application does not limit this. The present application only considers the first speaker 421, the second speaker 422, the third speaker 423, the fourth speaker 424, and the fifth speaker 425 for the driver's seat.

[0031] Assuming the input signals of the first speaker 421, the second speaker 422, the third speaker 423, the fourth speaker 424 and the fifth speaker 425 are S1, S2, S3, S4 and S5 respectively, then: S1=C(t), S2=L(t), S3=R(t), S4=L(t)-C(t), S5=R(t)-C(t);

[0032] wherein L(t) represents the left channel sound source of the preset audio signal, and R(t) represents the right channel sound source of the preset audio signal. Specifically, C(t) represents:

[0033] wherein, represents the first audio component with high correlation in the frequency range of f1-f2 between the left channel sound source and the right channel sound source in the preset audio signal, and the correlation between the left channel sound source and the right channel sound source is calculated by using the Pearson product-moment correlation coefficient square value, denoted as rsq in the above formula. In the above formula, R LR =0.8, f1=250Hz, f2=8000Hz, and based on this, C(t) can be rewritten as follows:

[0034] wherein x0=L(t), x1=R(t).

[0035] Thus, the left channel sound source of the preset audio signal can be rewritten as: L(t)=C(t)+[L(t)-C(t)];

[0036] wherein C(t) represents the first audio component with high correlation between the left channel sound source and the right channel sound source, and [L(t)-C(t)] represents the second audio component with low correlation between the left channel sound source and the right channel sound source.

[0037] The right channel sound source of the preset audio signal can also be rewritten as: R(t)=C(t)+[R(t)-C(t)];

[0038] wherein [R(t)-C(t)] represents the third audio component with low correlation between the left channel sound source and the right channel sound source.

[0039] Then, the actual acoustic response at the driver's seat can be represented as:

[0040] wherein, The first, second, third, fourth and fifth acoustic transfer functions of the digital filters of the first, second, fourth, third and fifth loudspeakers 421, 422, 424, 423 and 425, respectively, are represented by H1, H2, H3, H4 and H5, respectively, the second acoustic transfer functions of the first, second, fourth, third and fifth loudspeakers 421, 422, 424, 423 and 425 to the main driver seat are represented by h1, h2, h3, h4 and h5, respectively, and the electroacoustic conversion transfer functions of the first, second, fourth, third and fifth loudspeakers 421, 422, 424, 423 and 425 are represented by h1, h2, h3, h4 and h5, respectively. In addition, it should be noted that the transfer function refers to the ratio of the Laplace transform (or z-transform) of the response (i.e., output) quantity of the linear system under zero initial conditions to the Laplace transform of the excitation (i.e., input) quantity, which is one of the basic mathematical tools for describing the dynamic characteristics of a linear system and one of the main tools for studying classical control theory.

[0041] In some implementations of the present embodiment, as shown in FIG. 5, the preset loudspeakers 510 in the listening room include three, namely the left-channel loudspeaker 511, the center loudspeaker 512 and the right-channel loudspeaker 513, i.e., the acoustic environment of the listening room is two-channel, but is not limited to two-channel, and can also be single-channel or multi-channel. Then, the ideal acoustic response at the optimal listening position 520 can be represented as:

[0042] wherein [ ] is the transpose operation of the matrix, H T , H L , H C , H R represent the ideal acoustic transfer functions of the left-channel loudspeaker 511, the center loudspeaker 512 and the right-channel loudspeaker 513 to the optimal listening position 520, respectively, h L , h C , h R represent the ideal electroacoustic conversion transfer functions of the left-channel loudspeaker 511, the center loudspeaker 512 and the right-channel loudspeaker 513, respectively.

[0043] Based on the above description of the present embodiment, as shown in FIG. 8, after the sound field at the main driver seat is reconstructed, the sound field reconstruction result at the main driver seat can be represented as:

[0044] wherein || represents the modulus of the vector.

[0045] Generally, if only the sound field at a single seat in the cabin is reconstructed, such as only the sound field at the main driver seat is reconstructed, then the is solvable, and The solution of the equation is independent of the left channel sound source and the right channel sound source of the preset audio signal, that is, the sound system 400 can be designed, and if the sound field at all seats in the cabin is reconstructed, most cases cannot meet the requirement of the above formula for each seat, therefore, in order to have a good sound field reconstruction effect for each seat in the cabin, the above formula can be rewritten into the following optimal form:

[0046] Similarly, as shown in FIG. 9, the sound field reconstruction result at the co-driver seat can be represented as:

[0047] wherein H6, H7, H8, H9, H 10 respectively represent the second acoustic transfer functions from the first loudspeaker 421, the second loudspeaker 422, the third loudspeaker 423, the fourth loudspeaker 424 and the fifth loudspeaker 425 to the co-driver seat.

[0048] Similarly, as shown in FIG. 10, the sound field reconstruction result at the left rear seat can be represented as:

[0049] wherein, respectively represent the first acoustic transfer functions of the digital filters of the eighth loudspeaker 428, the sixth loudspeaker 426 and the seventh loudspeaker 427, h6, h7, h8 respectively represent the electroacoustic conversion transfer functions of the eighth loudspeaker 428, the sixth loudspeaker 426 and the seventh loudspeaker 427, H 11 , H 12 , H 13 , H 14 , H 15 , H 16 , H 17 , H 18 respectively represent the second acoustic transfer functions from the first loudspeaker 421, the second loudspeaker 422, the third loudspeaker 423, the fourth loudspeaker 424, the fifth loudspeaker 425, the sixth loudspeaker 426, the seventh loudspeaker 427 and the eighth loudspeaker 428 to the left rear seat.

[0050] Similarly, as shown in FIG. 11, the sound field reconstruction result at the right rear seat can be represented as:

[0051] wherein H 19 , H 20 , H 21 , H 22 , H 23 , H 24 , H 25 , H 26respectively represent the first, second, third, fourth, fifth, eighth, sixth and seventh acoustic transfer functions to the second seat in the back row to the right side.

[0052] As one of the embodiments, FIG. 12 is a module block diagram of the domain controller, the domain controller 410 comprises a memory 411 and a processor 412, the memory 411 is in communication connection with the processor 412, the memory 411 stores a computer program, the computer program is the in-vehicle sound field optimization method of the present application, that is, the processor 412 can call the computer program stored in the memory 411 to realize the in-vehicle sound field optimization method. In addition, it needs to be explained that in addition to the memory 411 and the processor 412, the domain controller 410 can also include other structures commonly used in the art, such as a communication line 413 for realizing the communication connection between the memory 411 and the processor 412, etc., which will not be enumerated one by one in the present application.

[0053] In some implementations of the present embodiment, the processor 412 is composed of an integrated circuit, which can be composed of a single packaged integrated circuit, or composed of multiple packaged integrated circuits with the same function or different functions. The processor 412 can include any one or a combination of a central processing unit (CPU), a microprocessor, a neural network chip, a digital processing chip, a graphics processor and various control chips. It can be understood that the processor 412 is the control core of the domain controller 410, and the processor 412 connects all components of the domain controller 410 through various interfaces and lines, and realizes various functions and data processing of the domain controller 410 by running or executing computer programs or modules and calling data, such as realizing the in-vehicle sound field optimization function of the present application.

[0054] In some implementations of the embodiment, the memory 411 includes at least one type of computer-readable storage medium, which can include but is not limited to flash memory, a mobile hard disk, a multimedia card, a card-type memory (such as an SD memory, a DX memory, etc.), a magnetic memory, a magnetic disk, and an optical disk. In these implementations, the memory 411 can be an internal storage unit of the domain controller 410 (such as a mobile hard disk of the domain controller 410), or an external storage device of the domain controller 410, such as a plug-in mobile hard disk, a smart memory card (SMC), a secure digital (SD) card, and a flash card, etc. equipped on the domain controller 410, or the memory 411 is both an internal storage unit and an external storage device of the domain controller 410; further, the memory 411 can be used not only to store application software, various data, and computer programs (such as codes for implementing the in-vehicle sound field optimization function of the present application) installed on the domain controller 410, but also to temporarily store data that has been output or will be output; in the actual working process of the domain controller 410, the processor 412 can call and run the computer programs stored in the memory 411, thereby implementing the in-vehicle sound field optimization function of the present application.

[0055] The above embodiment is only a preferred implementation of the present application, and is not the only limitation on the sound system 400, the domain controller 410, etc. related content; for this, those skilled in the art can make flexible settings according to the actual application scene on the basis of the above embodiment. Next, the computer program (i.e. the in-vehicle sound field optimization method) executed by the processor 412 in the domain controller 410 will be described in detail. FIG. 13 is a flowchart of the in-vehicle sound field optimization method, which in some embodiments includes steps 1301 to 1304 (abbreviated as S1301 to S1304), i.e.:

[0056] S1301, calculating an actual acoustic response at the target seat according to the preset audio signal, the electro-acoustic transfer function of each loudspeaker 420, the first acoustic transfer function of each digital filter, and the second acoustic transfer function from each loudspeaker 420 to the target seat in the cabin;

[0057] S1302, calculating an ideal acoustic response at the optimal listening position 520 according to the preset audio signal, the ideal acoustic transfer function from each preset loudspeaker 510 to the optimal listening position 520 in the listening room, and the ideal electro-acoustic transfer function of each preset loudspeaker 510;

[0058] S1303, reconstructing the sound field at the target seat to obtain a sound field reconstruction result at the target seat, based on the actual acoustic response being consistent with the ideal acoustic response;

[0059] S1304, aggregate the sound field reconstruction results at each seat and store them.

[0060] In addition, it should be noted that the process of reconstructing the sound field at the target seat in S1303 based on the actual acoustic response matching the ideal acoustic response is essentially a process of fitting the target sound field at the target seat and the ideal sound field of the listening room, and the fitting content can include but is not limited to amplitude response fitting, sound image positioning fitting, and uniformity fitting. It should also be noted that for the details of the in-vehicle sound field optimization method, please refer to the relevant description of the audio system 400 above, which will not be described here.

[0061] The above embodiments are only preferred implementations of the present application, and they are not the only limit of the related content of the in-vehicle sound field optimization method; based on the above embodiments, those skilled in the art can make flexible settings according to the actual application scene. It can be understood that through the implementation of the above embodiments of the present application, the actual acoustic response of the target seat to the playback of the preset audio signal by each loudspeaker 420 is calculated based on the preset audio signal, the electro-acoustic transfer function of each loudspeaker 420 in the cabin, the first acoustic transfer function of each digital filter, and the second acoustic transfer function from each loudspeaker 420 to the target seat. The ideal acoustic response at the optimal listening position 520 to the playback of the preset audio signal by each preset loudspeaker 510 is calculated based on the preset audio signal, the ideal acoustic transfer function from each preset loudspeaker 510 to the optimal listening position 520 in the listening room, and the ideal electro-acoustic transfer function of each preset loudspeaker 510. Then, based on the actual acoustic response matching the ideal acoustic response, the sound field at the target seat is reconstructed, and the sound field reconstruction result at the target seat is obtained. Finally, the sound field reconstruction results at each seat are aggregated and stored, which completes the optimization of the sound field in the cabin. As can be seen, the sound field reconstruction at each seat is based on the actual acoustic response matching the ideal acoustic response, that is, the audio system 400 can control each loudspeaker 420 to perform sound playback of the to-be-played audio signal based on the sound field reconstruction result at each seat. At this time, the actual acoustic response at each seat will match the ideal acoustic response of the listening room, that is, for each passenger seated on each seat, the sound energy / sound field between his / her ears is balanced, and the size of his / her sound field is at least consistent with the physical layout of the loudspeakers 420 in the cabin. Even it can break through the physical space limit of the cabin, and the sound field will not have obvious faults, thereby achieving the balance between sound field size and sound energy / sound field between passengers' ears, and improving the acoustic experience of passengers at each seat in the cabin.

[0062] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two, where the software module can be stored in a random access memory (RAM), a memory, a read only memory (ROM), an electrically programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0063] In the foregoing embodiments, all or some of the steps can be implemented by using software, hardware, firmware or any combination thereof. When implemented by using software, the steps can be implemented by one or more computer programs. When implemented by using software, the computer programs can be stored in a computer readable medium, such as a RAM, a flash memory, a ROM, an EEPROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. The computer readable medium can be located in a computer, a server, a data center, or any other form of data storage known in the art.

[0064] It should be noted that each of the above-mentioned embodiments of the present application is described by using a progressive manner, and each embodiment focuses on the difference from other embodiments. Therefore, the same or similar parts among the embodiments can be understood by referring to each other. It should also be noted that the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any actual relationship or sequence between the entities or operations. In addition, the terms "include", "contain" or any variants thereof are intended to cover non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements not only includes the listed elements, but also includes other elements not explicitly listed or inherent to the process, the method, the article or the apparatus. Without further limitation, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, the method, the article or the apparatus including the elements.

[0065] The previous description of the disclosed implementations is provided to enable any person skilled in the art to make or use the features of the present disclosure. Various modifications to these implementations will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other implementations without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the described implementations but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An in-vehicle sound field optimization method applied to an audio system of a vehicle, the audio system being arranged in a cabin of the vehicle and comprising a plurality of loudspeakers respectively located at different positions in the cabin, and the cabin being configured with a plurality of seats, characterized in that, Each of the loudspeakers is configured with a digital filter, and the in-vehicle sound field optimization method comprises: According to the preset audio signal, the electro-acoustic conversion transfer function of each of the loudspeakers, the first acoustic transfer function of each of the digital filters, and the second acoustic transfer function of each of the loudspeakers to the target seat in the cabin, the actual acoustic response at the target seat is calculated; According to the preset audio signal, the ideal acoustic transfer function of each of the preset loudspeakers to the optimal listening position in the listening room, and the ideal electro-acoustic conversion transfer function of each of the preset loudspeakers, the ideal acoustic response at the optimal listening position is calculated; The sound field at the target seat is reconstructed according to the actual acoustic response and the ideal acoustic response, and the sound field reconstruction result at the target seat is obtained; The sound field reconstruction results at each of the seats are summarized and stored.

2. The in-vehicle sound field optimization method of claim 1, wherein, The step of calculating the actual acoustic response at the target seat according to the preset audio signal, the electro-acoustic conversion transfer function of each of the loudspeakers, the first acoustic transfer function of each of the digital filters, and the second acoustic transfer function of each of the loudspeakers to the target seat in the cabin comprises: Obtaining the left channel sound source and the right channel sound source of the preset audio signal, and analyzing the first audio component with high correlation between the left channel sound source and the right channel sound source, the second audio component with low correlation between the left channel sound source and the right channel sound source, and the third audio component with low correlation between the right channel sound source and the left channel sound source in the right channel sound source; According to the first audio component, the second audio component, the third audio component, the electro-acoustic conversion transfer function of each of the loudspeakers, the first acoustic transfer function of each of the digital filters, and the second acoustic transfer function of each of the loudspeakers to the target seat in the cabin, the actual acoustic response at the target seat is calculated; The step of calculating the ideal acoustic response at the optimal listening position according to the preset audio signal, the ideal acoustic transfer function of each of the preset loudspeakers to the optimal listening position in the listening room, and the ideal electro-acoustic conversion transfer function of each of the preset loudspeakers comprises: According to the first audio component, the second audio component, the third audio component, the ideal acoustic transfer function of each of the preset loudspeakers to the optimal listening position in the listening room, and the ideal electro-acoustic conversion transfer function of each of the preset loudspeakers, the ideal acoustic response at the optimal listening position is calculated. The cabin is also configured with a center console near the front of the vehicle and a storage table near the rear of the vehicle, and the plurality of seats include a main driver seat, a co-driver seat, a rear left seat, and a rear right seat, the main driver seat and the co-driver seat are arranged side by side and adjacent to the center console, and the rear left seat and the rear right seat are arranged side by side and adjacent to the storage table; 3. The in-vehicle sound field optimization method of claim 2, wherein, ​ The plurality of loudspeakers comprises a first loudspeaker, a second loudspeaker, a third loudspeaker, a fourth loudspeaker, a fifth loudspeaker, a sixth loudspeaker, a seventh loudspeaker and an eighth loudspeaker, the first loudspeaker is located at the center of the center console, the second loudspeaker is located at one side of the center console and adjacent to the main driver seat, the third loudspeaker is located at the other side of the center console and adjacent to the co-driver seat, the fourth loudspeaker is located on the left front door of the car, the fifth loudspeaker is located on the right front door of the car, the sixth loudspeaker is located on the left rear door of the car, the seventh loudspeaker is located on the right rear door of the car, and the eighth loudspeaker is located between the left rear seat and the right rear seat. The first acoustic transfer function of the digital filter of the first loudspeaker, the second loudspeaker, the fourth loudspeaker, the third loudspeaker and the fifth loudspeaker is represented by H1, H2, H3, H4 and H5 respectively, the second acoustic transfer function of the first loudspeaker, the second loudspeaker, the fourth loudspeaker, the third loudspeaker and the fifth loudspeaker to the main driver seat is represented by h1, h2, h3, h4 and h5 respectively, and the electroacoustic conversion transfer function of the first loudspeaker, the second loudspeaker, the fourth loudspeaker, the third loudspeaker and the fifth loudspeaker is represented by H1, H2, H3, H4 and H5 respectively.

4. The in-vehicle sound field optimization method of claim 3, wherein, The preset loudspeakers include a left channel loudspeaker, a center loudspeaker, and a right channel loudspeaker, and the ideal acoustic response at the sweet spot is represented as: wherein [] T is a transpose operation of a matrix, L(t) represents the left channel sound source, R(t) represents the right channel sound source, C(t) represents the first audio component, [L(t)-C(t)] represents the second audio component, [R(t)-C(t)] represents the third audio component, H L , H C , H R respectively represent the ideal acoustic transfer functions from the left channel speaker, the center speaker and the right channel speaker to the optimal listening position, h L , h C , h R respectively represent the ideal electro-acoustic transfer functions of the left channel speaker, the center speaker and the right channel speaker.

5. The in-vehicle sound field optimization method of claim 4, wherein, The actual acoustic response at the primary driver seat is represented as: wherein Wherein, || represents the modulus of the calculation vector.

6. The in-vehicle sound field optimization method of claim 5, wherein, The sound field reconstruction result at the main driver seat is represented as: The second acoustic transfer function of the first loudspeaker, the second loudspeaker, the fourth loudspeaker, the third loudspeaker, the fifth loudspeaker, the sixth loudspeaker, the seventh loudspeaker and the eighth loudspeaker to the left rear seat is represented by H1, H2, H3, H4, H5, H6, H7 and H8 respectively.

7. The in-vehicle sound field optimization method of claim 6, wherein, The sound field reconstruction result at the co-driver seat is represented as: wherein H6, H7, H8, H9, H 10 respectively represent the second acoustic transfer functions from the first speaker, the second speaker, the third speaker, the fourth speaker, and the fifth speaker to the second seat of the passenger seat.

8. The in-vehicle sound field optimization method of claim 7, wherein, The sound field reconstruction result at the back row left seat is represented as: wherein, are the first acoustic transfer functions of the digital filters of the eighth speaker, the sixth speaker, and the seventh speaker, h6, h7, and h8 are the electroacoustic conversion transfer functions of the eighth speaker, the sixth speaker, and the seventh speaker, respectively. 11 、H 12 、H 13 、H 14 、H 15 、H 16 、H 17 、H 18 The first speaker, the second speaker, the third speaker, and the fourth speaker are represented respectively. Further comprising:

9. The in-vehicle sound field optimization method of claim 8, wherein, The sound field reconstruction result at the rear right seat is represented as: wherein H 19 , H 20 , H 21 , H 22 , H 23 , H 24 , H 25 , H 26 respectively represent the second acoustic transfer functions from the first speaker, the second speaker, the third speaker, the fourth speaker, the fifth speaker, the eighth speaker, the sixth speaker, and the seventh speaker to the second row right seat.

10. The in-vehicle sound field optimization method of claim 1, wherein, Based on the sound field reconstruction result at each seat, the sound playback of the audio signal to be played is controlled by each loudspeaker. The domain controller is used to realize the in-vehicle sound field optimization method of any one of claims 1-10.

11. An audio system applied in a vehicle, the audio system being arranged in a cabin of the vehicle, comprising a domain controller and a plurality of loudspeakers respectively located at different positions in the cabin and communicatively connected to the domain controller, characterized in that, Comprising:

12. An electronic device, comprising: A memory storing a computer program; A processor communicatively connected to the memory for calling the computer program to realize the in-vehicle sound field optimization method of any one of claims 1-10. The computer readable storage medium stores a computer program, and the computer program is used to be called by the processor to realize the in-vehicle sound field optimization method of any one of claims 1-10.

13. A computer-readable storage medium, characterized in that, ​

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