Phased array based directional sound propagation method, apparatus, device and storage medium

Abstract

The application provides a phased array-based directional sound propagation method, device, equipment and storage medium, which comprises the following steps: obtaining environmental information of a target area; matching a corresponding initial sound field model from a pre-constructed multi-scene sound field database; dynamically correcting the initial sound field model; calculating a current optimal phase weight matrix based on the corrected sound field model; and controlling the sound emission phase of each loudspeaker unit in a phased array loudspeaker array according to the phase weight matrix, so that sound is directionally propagated in the target area. The application precisely controls the sound wave propagation direction, significantly attenuates the sound pressure level in the non-target area, avoids interference of sound on surrounding residents and environment, and improves the environmental comfort. Moreover, the sound field model is dynamically corrected and the phase weight is optimized, so that the sound pressure level is uniformly distributed in the target area, and the intelligibility and auditory experience of voice and music are improved.

Description

Technical Field

[0001] This invention relates to the field of directional broadcasting technology, and in particular to a method, apparatus, device, and storage medium for directional sound propagation based on a phased array. Background Technology

[0002] As modern public spaces increasingly demand higher standards for sound propagation and environmental comfort, the application of traditional broadcasting systems in open spaces such as campuses, plazas, and shopping malls has revealed significant shortcomings. Traditional broadcasting systems typically employ an omnidirectional sound source design, causing sound to diffuse uniformly in all directions through the air. This results in sound not only reaching listeners in the target area but also spreading to non-target areas, causing noise pollution and impacting the quality of life for surrounding residents and the environment. To reduce noise interference, existing technologies typically employ methods such as lowering the volume, adding sound barriers, or using directional loudspeakers. However, these methods suffer from drawbacks such as reduced sound quality, uneven coverage, or high costs, making it difficult to effectively suppress sound leakage while ensuring sound clarity in the target area.

[0003] In recent years, phased array beamforming technology has attracted attention due to its precise directional sound propagation capabilities. This technology achieves spatial focusing and directional propagation of sound beams by controlling the phase of the sound emitted by the loudspeaker unit. However, how to dynamically adjust the sound field model and phase control in conjunction with complex and ever-changing environmental information to ensure directional propagation effectiveness and environmental adaptability remains a pressing technical challenge that needs to be addressed.

[0004] In summary, the problems existing in the current technology urgently need to be solved. Summary of the Invention

[0005] This invention provides a method, apparatus, device, and storage medium for directional sound propagation based on a phased array, which addresses the shortcomings of existing technologies, enables precise control of the direction of sound wave propagation, and achieves significant attenuation of sound pressure level in non-target areas.

[0006] This invention provides a method for directional sound propagation based on a phased array, comprising: Acquire environmental information about the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area; Based on the environmental information, an initial sound field model corresponding to the current spatial layout, reflector distribution, and noise level is matched from a pre-built multi-scene sound field database. The initial sound field model is dynamically corrected using the propagation location information and the sound pressure feedback data of the initial sound field model. Based on the corrected sound field model, calculate the current optimal phase weight matrix; According to the phase weight matrix, the sound emission phase of each speaker unit in the phased array speaker array is controlled so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0007] According to the directional sound propagation method based on phased array provided by the present invention, the step of acquiring environmental information of the target area specifically includes: The environmental information is collected through a sensor network, which includes: LiDAR is used to acquire three-dimensional data on spatial layout and reflective surface distribution; An environmental noise sensor is used to measure the noise level in a target area. Video cameras are used to identify the location of people or objects within a target area in order to determine the location information to be transmitted.

[0008] According to the directional sound propagation method based on a phased array provided by the present invention, the step of dynamically correcting the initial sound field model using the propagation position information and the sound pressure feedback data of the initial sound field model specifically includes: Error analysis is performed between the sound pressure feedback data collected by the microphone array and the predicted sound pressure distribution of the initial sound field model; Adjust the propagation direction and boundary conditions in the initial sound field model according to the propagation location information; Based on the error analysis results and the adjusted propagation direction and boundary conditions, the sound field parameters in the initial sound field model are corrected to obtain the corrected sound field model.

[0009] According to the directional sound propagation method based on a phased array provided by the present invention, the step of calculating the current optimal phase weight matrix based on the corrected sound field model specifically includes: Obtain the expected sound pressure level and sound field uniformity index of the target area; Based on the expected sound pressure level and the sound field uniformity index, an optimization objective function is constructed with the goal of minimizing the sound pressure error in the target area. Based on the corrected sound field model and the optimization objective function, the current optimal phase weight matrix is ​​determined.

[0010] According to the present invention, a method for directional sound propagation based on a phased array is provided. The step of controlling the emission phase of each loudspeaker unit in the phased array loudspeaker array according to the phase weight matrix to enable directional sound propagation in the target area specifically includes: The phase weight matrix is ​​used to generate control signals that control the sound phase of each speaker unit. According to the control signal, each loudspeaker unit is controlled to emit sound synchronously with a specified phase difference within the target frequency band, so as to form an enhanced sound wave interference beam pointing towards the target area through phase superposition.

[0011] According to the present invention, a directional sound propagation method based on a phased array is provided, wherein a display device is further provided in the target area. After the step of controlling the emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix to enable the sound to propagate directionally in the target area, the method further includes: Convert the phase weight matrix into a DMX signal; The display content and display area of ​​the display device are controlled according to the DMX signal.

[0012] According to the present invention, a directional sound propagation method based on a phased array is provided, wherein the target area is divided into several spatial regions, and the step of controlling the display content and display area of ​​the display device according to the DMX signal specifically includes: The sound pressure level information of each spatial region contained in the DMX signal is analyzed to determine the sound pressure level information of each spatial region within the target area; The sound pressure level information is displayed on the corresponding display area of ​​each spatial region.

[0013] The present invention also provides a directional sound propagation device based on a phased array, comprising: The information acquisition module is used to acquire environmental information of the target area, including spatial layout, reflective surface distribution, noise level, and target area location; The model matching module is used to match an initial sound field model corresponding to the current spatial layout, reflector distribution and noise level from a pre-built multi-scene sound field database based on the environmental information. The model correction module is used to dynamically correct the initial sound field model using the sound pressure feedback data of the initial sound field model and the location information of the target area obtained by the camera. The matrix calculation module is used to calculate the current optimal phase weight matrix based on the feedback data and the corrected sound field model. An array control module is used to control the sound emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix, so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the phased array-based directional sound propagation method as described above.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the phased array-based directional sound propagation method as described above.

[0016] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the phased array-based directional sound propagation method as described above.

[0017] This invention provides a phased array-based method, apparatus, device, and storage medium for directional sound propagation. The method involves: acquiring environmental information of a target area; matching a corresponding initial sound field model from a pre-constructed multi-scene sound field database based on the environmental information; dynamically correcting the initial sound field model using the propagation location information and sound pressure feedback data from the initial sound field model; calculating the optimal phase weight matrix based on the corrected sound field model; and controlling the emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix to enable directional sound propagation in the target area. This invention achieves significant sound pressure level attenuation in non-target areas by precisely controlling the sound wave propagation direction, avoiding sound interference with surrounding residents and the environment, and improving environmental comfort. Furthermore, by dynamically correcting the sound field model and optimizing the phase weights, it ensures a uniform distribution of sound pressure level within the target area, improving the intelligibility of speech and music and enhancing the auditory experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the directional sound propagation method based on a phased array provided by the present invention. Figure 2 This is a schematic diagram of the structure of the phased array-based directional sound propagation device provided by the present invention; Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] To address the problems in existing technologies, this invention proposes a phased array-based directional sound propagation method to achieve precise control of the sound wave propagation direction and significant attenuation of sound pressure level in non-target areas. The phased array-based directional sound propagation method is described below, as follows... Figure 1 As shown, including but not limited to the following steps: Step 110: Obtain environmental information of the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area.

[0022] Multidimensional environmental data of the target area is collected through a deployed sensor network, wherein the environmental information includes, but is not limited to, the following: Spatial layout information: The three-dimensional structure, boundary contours, and obstacle distribution of the target area are collected using LiDAR. Reflecting surface distribution information: By combining radar echo data with environmental modeling algorithms, the location and material of sound wave reflecting interfaces such as walls and ceilings are identified; Noise level: Parameters such as sound pressure level and spectral distribution of the current background noise in the target area are obtained through environmental noise sensors; Location information transmission: Identify the location of people or target objects within a region using video cameras to determine the spatial area where sound needs to be accurately transmitted.

[0023] Step 120: Based on the environmental information, match an initial sound field model from a pre-built multi-scene sound field database that corresponds to the current spatial layout, reflector distribution, and noise level.

[0024] In step 120, based on the environmental information obtained in step 110, an initial sound field model matching the current spatial layout, reflector distribution, and noise level is searched from a pre-built multi-scene sound field database. This database stores simulation results of typical scenarios (such as playgrounds, conference rooms, and shopping malls) under different acoustic environments, including sound pressure distribution maps, phase weight templates, reverberation parameters, and other data. Through feature comparison and matching rules, an initial sound field model most suitable for the current environment is determined.

[0025] Step 130: Dynamically correct the initial sound field model using the propagation location information and the sound pressure feedback data of the initial sound field model.

[0026] In step 130, after executing the initial model, the actual sound pressure feedback data is collected by a microphone array set in the target area, and the initial sound field model is dynamically corrected by combining the propagation position information.

[0027] Specifically, it includes: The actual sound pressure data is compared with the expected sound pressure distribution of the initial model, and the error distribution diagram is calculated. Based on the propagation location information, the parameters such as the emission direction and phase control boundary in the model are fine-tuned; Based on the error diagram and boundary adjustments, key parameters such as the phase response function and reflection coefficient in the model are corrected, thereby generating a corrected sound field model.

[0028] Step 140: Calculate the current optimal phase weight matrix based on the corrected sound field model.

[0029] In step 140, the expected sound pressure level and sound field uniformity index of the target area are obtained, such as the expected maximum sound pressure and allowable non-uniformity, and an optimization objective function is constructed (e.g., minimizing sound pressure error or maximizing beam concentration).

[0030] Subsequently, based on the corrected sound field model, the optimal phase weight matrix under the current environment is solved using optimization algorithms (such as particle swarm optimization and gradient descent). This matrix is ​​used to guide the phase control of each loudspeaker unit, thereby achieving spatially directional sound wave superposition.

[0031] Step 150: According to the phase weight matrix, control the sound emission phase of each speaker unit in the phased array speaker array so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units is less than half of the operating frequency wavelength.

[0032] In step 150, the phase weight matrix is ​​sent to the phased array loudspeaker array control module, and a phase control signal for controlling each loudspeaker unit is generated based on the matrix value. Under the action of the control signal, each loudspeaker unit in the array emits sound synchronously with different phases within a specified frequency band, generating an acoustic interference beam with spatial focusing characteristics, thereby achieving directional propagation of sound in the target area.

[0033] The phased array loudspeaker array consists of multiple loudspeaker units, with the spacing between units set to be less than half the wavelength of the target operating frequency, in order to ensure beamforming effect, avoid sidelobe interference, and improve spatial resolution.

[0034] As a further optional embodiment, the step of obtaining environmental information of the target area specifically includes: The environmental information is collected through a sensor network, which includes: LiDAR is used to acquire three-dimensional data on spatial layout and reflective surface distribution; An environmental noise sensor is used to measure the noise level in a target area. Video cameras are used to identify the location of people or objects within a target area in order to determine the location information to be transmitted.

[0035] In this embodiment, the environmental information is collected by a sensor network deployed in the target area. The sensor network includes, but is not limited to, the following sensing devices: LiDAR (Light Detection and Ranging): Used to scan the structural layout within a target area and generate three-dimensional point cloud data containing spatial boundaries, obstacle locations, and reflective surface distribution, thereby constructing an accurate spatial topology model; Environmental noise sensor: used to collect background noise data in the target area, including instantaneous sound pressure level, long-term equivalent sound level and main noise frequency band, to provide basic parameters for subsequent sound field model matching; Video cameras are used to collect spatial location information of people or objects within a target area in real time. They extract data such as crowd distribution and movement paths through image recognition or target detection algorithms, thereby determining the target area for sound propagation.

[0036] By using the aforementioned multi-source sensor fusion sensing methods, multi-dimensional modeling of the target area environment can be achieved, providing high-quality data support for the subsequent matching and optimization of the initial sound field model.

[0037] As a further optional embodiment, the step of dynamically correcting the initial sound field model using the propagation location information and the sound pressure feedback data of the initial sound field model specifically includes: Error analysis is performed between the sound pressure feedback data collected by the microphone array and the predicted sound pressure distribution of the initial sound field model; Adjust the propagation direction and boundary conditions in the initial sound field model according to the propagation location information; Based on the error analysis results and the adjusted propagation direction and boundary conditions, the sound field parameters in the initial sound field model are corrected to obtain the corrected sound field model.

[0038] In this embodiment, firstly, the current sound pressure feedback data is collected using multiple preset sampling points in the target area using a microphone array. Then, the sound pressure feedback data is compared with the predicted sound pressure distribution at the corresponding position in the initial sound field model to perform error analysis, thereby obtaining the sound pressure deviation value and the spatial error distribution map.

[0039] Subsequently, by combining the propagation position information obtained by sensing devices such as video cameras, the propagation direction and boundary conditions (such as the position of the reflecting surface and the sound absorption boundary parameters) set in the initial sound field model are adjusted in real time to make the model more consistent with the current real environment.

[0040] Finally, based on the sound pressure error analysis results and the adjustment data of propagation direction and boundary conditions, the sound field parameters (including but not limited to the sound source directivity function, sound velocity field, boundary reflection coefficient, etc.) in the initial sound field model are optimized and corrected to obtain the dynamically corrected sound field model, which provides an accurate basis for the subsequent optimization calculation of the phase weight matrix.

[0041] As a further optional embodiment, the step of calculating the current optimal phase weight matrix based on the corrected sound field model specifically includes: Obtain the expected sound pressure level and sound field uniformity index of the target area; Based on the expected sound pressure level and the sound field uniformity index, an optimization objective function is constructed with the goal of minimizing the sound pressure error in the target area. Based on the corrected sound field model and the optimization objective function, the current optimal phase weight matrix is ​​determined.

[0042] In this embodiment, firstly, the expected sound pressure level of the target area is obtained. This expected value can be preset by the system or determined according to the human comfort standard of the specific application scenario (such as campus broadcasting, commercial promotion, public guidance, etc.). At the same time, sound field uniformity indicators used to describe the uniformity of sound field distribution are extracted, such as sound pressure level standard deviation, non-uniformity index (dB), etc.

[0043] Subsequently, an optimization objective function is constructed, which aims to minimize the sound pressure level error within the target region, while introducing a sound field uniformity index as a constraint or auxiliary objective. For example, the optimization objective function can be expressed as:

[0044] in, W The phase weight matrix is... P i sim Let i be the simulated sound pressure level at the i-th sampling point under the corrected model. P i target To correspond to the desired sound pressure level, Var(P sim ) Let denoted as the variance of the sound pressure distribution within the target area, and λ be the uniformity adjustment factor.

[0045] Finally, based on the spatial acoustic propagation characteristics contained in the corrected sound field model, numerical optimization algorithms (such as gradient descent, genetic algorithm or particle swarm optimization) are used to solve for the sound emission phase of the loudspeaker unit and determine the current optimal phase weight matrix for subsequent sound wave directional control.

[0046] As a further optional embodiment, the step of controlling the sound emission phase of each loudspeaker unit in the phased array loudspeaker array according to the phase weight matrix to enable the sound to propagate directionally in the target area specifically includes: The phase weight matrix is ​​used to generate control signals that control the sound phase of each speaker unit. According to the control signal, each loudspeaker unit is controlled to emit sound synchronously with a specified phase difference within the target frequency band, so as to form an enhanced sound wave interference beam pointing towards the target area through phase superposition.

[0047] In this embodiment, the phase weight matrix is ​​converted into a sound phase control signal for controlling the sound emission of each speaker unit. Each control signal indicates the phase angle at which the corresponding speaker unit should emit sound in a specific frequency band.

[0048] Subsequently, the DSP control module or FPGA array control module precisely controls each speaker unit to achieve synchronous sound emission within the target frequency band (e.g., 200Hz to 12800Hz) based on the control signal, while maintaining the required specified phase difference between each unit.

[0049] In this way, the sound waves from different speaker units in space will form a coherent superposition interference effect within the target area, which enhances the sound energy in the target direction and suppresses it in other directions, thereby forming a sound wave interference beam with enhanced directivity and realizing the directional propagation control of sound.

[0050] As a further optional embodiment, a display device is also provided in the target area. After the step of controlling the sound emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix to make the sound propagate directionally in the target area, the method further includes: Convert the phase weight matrix into a DMX signal; The display content and display area of ​​the display device are controlled according to the DMX signal.

[0051] In this embodiment, the target area is spatially divided into multiple spatial sub-regions, for example, by dividing it into several equal-area units in a grid pattern or by logically dividing it according to functional areas (such as square dancing area, rest area, passageway area, etc.). Each sub-region corresponds to a display sub-region on the display device.

[0052] Analyze the sound pressure level information of each spatial sub-region contained in the DMX signal, including the current sound pressure level value, trend of change, or whether it exceeds the set threshold for each sub-region.

[0053] The sound pressure level information is converted into display parameters according to preset mapping rules, including: Sound pressure level and brightness mapping: For example, for every 6 dB increase, the LED brightness increases by one level, with a brightness range of 0–255; When the sound pressure level exceeds the safety threshold, the corresponding sub-region will turn red as a warning. Areas with uniform sound pressure are displayed in green, while noise boundary areas are indicated in yellow.

[0054] By applying the above display parameters to the corresponding display areas, the sound pressure level of each sub-area is dynamically displayed in real time on LED screens or other display devices, achieving an intuitive linkage effect of "where there is sound, there is light" or "the higher the sound pressure, the stronger the brightness", assisting in crowd guidance and sound propagation monitoring.

[0055] As a further optional embodiment, the target area is divided into several spatial regions, and the step of controlling the display content and display area of ​​the display device according to the DMX signal specifically includes: The sound pressure level information of each spatial region contained in the DMX signal is analyzed to determine the sound pressure level information of each spatial region within the target area; The sound pressure level information is displayed on the corresponding display area of ​​each spatial region.

[0056] The spatial region sound pressure level information carried in the DMX signal is analyzed to identify the current sound pressure state of each spatial region within the target area, including the sound pressure level value, the trend of change, or whether it exceeds a preset threshold. Based on the analysis results, the sound pressure level information of the spatial region is displayed on the display area of ​​the display device corresponding to each spatial region. The display information includes, but is not limited to, color brightness, graphic symbols or numerical labels, which are used to intuitively reflect the sound intensity or propagation of different regions.

[0057] The directional sound propagation device based on a phased array provided by the present invention will be described below, such as... Figure 2 As shown, the phased array-based directional sound propagation device described below and the phased array-based directional sound propagation method described above can be referred to in correspondence.

[0058] A phased array-based directional sound propagation device includes: The information acquisition module 210 is used to acquire environmental information of the target area, including spatial layout, reflective surface distribution, noise level and target area location; The model matching module 220 is used to match an initial sound field model corresponding to the current spatial layout, reflector distribution and noise level from a pre-built multi-scene sound field database based on the environmental information. The model correction module 230 is used to dynamically correct the initial sound field model using the sound pressure feedback data of the initial sound field model and the location information of the target area obtained by the camera. The matrix calculation module 240 is used to calculate the current optimal phase weight matrix based on the feedback data and the corrected sound field model. The array control module 250 is used to control the sound emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix, so that the sound propagates in a direction in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0059] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include: a processor 310, a communications interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communications interface 320, and the memory 330 communicate with each other via the communication bus 340. The processor 310 can call logical instructions in the memory 330 to execute a phased array-based directional sound propagation method, which includes: Acquire environmental information about the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area; Based on the environmental information, an initial sound field model corresponding to the current spatial layout, reflector distribution, and noise level is matched from a pre-built multi-scene sound field database. The initial sound field model is dynamically corrected using the propagation location information and the sound pressure feedback data of the initial sound field model. Based on the corrected sound field model, calculate the current optimal phase weight matrix; According to the phase weight matrix, the sound emission phase of each speaker unit in the phased array speaker array is controlled so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0060] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0061] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is able to execute the phased array-based directional sound propagation method provided by the above methods, the method comprising: Acquire environmental information about the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area; Based on the environmental information, an initial sound field model corresponding to the current spatial layout, reflector distribution, and noise level is matched from a pre-built multi-scene sound field database. The initial sound field model is dynamically corrected using the propagation location information and the sound pressure feedback data of the initial sound field model. Based on the corrected sound field model, calculate the current optimal phase weight matrix; According to the phase weight matrix, the sound emission phase of each speaker unit in the phased array speaker array is controlled so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0062] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the phased array-based directional sound propagation method provided by the above methods, the method comprising: Acquire environmental information about the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area; Based on the environmental information, an initial sound field model corresponding to the current spatial layout, reflector distribution, and noise level is matched from a pre-built multi-scene sound field database. The initial sound field model is dynamically corrected using the propagation location information and the sound pressure feedback data of the initial sound field model. Based on the corrected sound field model, calculate the current optimal phase weight matrix; According to the phase weight matrix, the sound emission phase of each speaker unit in the phased array speaker array is controlled so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength.

[0063] The device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0064] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A method for directional sound propagation based on a phased array, characterized in that, include: Acquire environmental information about the target area, including spatial layout, reflective surface distribution, noise level, and propagation location information of the target area; Based on the environmental information, an initial sound field model corresponding to the current spatial layout, reflector distribution, and noise level is matched from a pre-built multi-scene sound field database. The initial sound field model is dynamically corrected using the propagation location information and the sound pressure feedback data of the initial sound field model. Based on the corrected sound field model, calculate the current optimal phase weight matrix; According to the phase weight matrix, the sound emission phase of each speaker unit in the phased array speaker array is controlled so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength; The step of dynamically correcting the initial sound field model using the propagation location information and the sound pressure feedback data of the initial sound field model specifically includes: Error analysis is performed between the sound pressure feedback data collected by the microphone array and the predicted sound pressure distribution of the initial sound field model; Adjust the propagation direction and boundary conditions in the initial sound field model according to the propagation location information; Based on the error analysis results and the adjusted propagation direction and boundary conditions, the sound field parameters in the initial sound field model are corrected to obtain the corrected sound field model. The step of calculating the current optimal phase weight matrix based on the corrected sound field model specifically includes: Obtain the expected sound pressure level and sound field uniformity index of the target area; Based on the expected sound pressure level and the sound field uniformity index, an optimization objective function is constructed with the goal of minimizing the sound pressure error in the target area. Based on the corrected sound field model and the optimization objective function, the current optimal phase weight matrix is ​​determined.

2. The directional sound propagation method based on phased array according to claim 1, characterized in that, The step of obtaining environmental information of the target area specifically includes: The environmental information is collected through a sensor network, which includes: LiDAR is used to acquire three-dimensional data on spatial layout and reflective surface distribution; An environmental noise sensor is used to measure the noise level in a target area. Video cameras are used to identify the location of people or objects within a target area in order to determine the location information to be transmitted.

3. The directional sound propagation method based on phased array according to claim 1, characterized in that, The step of controlling the sound emission phase of each loudspeaker unit in the phased array loudspeaker array according to the phase weight matrix to enable the sound to propagate directionally in the target area specifically includes: A control signal is generated to control the sound phase of each speaker unit based on the phase weight matrix. According to the control signal, each loudspeaker unit is controlled to emit sound synchronously with a specified phase difference within the target frequency band, so as to form an enhanced sound wave interference beam pointing towards the target area through phase superposition.

4. The directional sound propagation method based on phased array according to claim 1, characterized in that, A display device is also provided in the target area. After the step of controlling the sound emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix to make the sound propagate directionally in the target area, the method further includes: Convert the phase weight matrix into a DMX signal; The display content and display area of ​​the display device are controlled according to the DMX signal.

5. The directional sound propagation method based on a phased array according to claim 4, characterized in that, The target area is divided into several spatial regions, and the step of controlling the display content and display area of ​​the display device according to the DMX signal specifically includes: The sound pressure level information of each spatial region contained in the DMX signal is analyzed to determine the sound pressure level information of each spatial region within the target area; The sound pressure level information is displayed on the corresponding display area of ​​each spatial region.

6. A method for directional sound propagation based on a phased array, characterized in that, include: The information acquisition module is used to acquire environmental information of the target area, including spatial layout, reflective surface distribution, noise level, and target area location; The model matching module is used to match an initial sound field model corresponding to the current spatial layout, reflector distribution and noise level from a pre-built multi-scene sound field database based on the environmental information. The model correction module is used to dynamically correct the initial sound field model using the sound pressure feedback data of the initial sound field model and the location information of the target area obtained by the camera. The matrix calculation module is used to calculate the current optimal phase weight matrix based on the feedback data and the corrected sound field model. An array control module is used to control the sound emission phase of each speaker unit in the phased array speaker array according to the phase weight matrix, so that the sound propagates directionally in the target area; the phased array speaker array is set in the target area, and the phased array speaker array is composed of multiple speaker units, the spacing between the speaker units being less than half of the operating frequency wavelength; The step of dynamically correcting the initial sound field model using the propagation location information and the sound pressure feedback data of the initial sound field model specifically includes: Error analysis is performed between the sound pressure feedback data collected by the microphone array and the predicted sound pressure distribution of the initial sound field model; Adjust the propagation direction and boundary conditions in the initial sound field model according to the propagation location information; Based on the error analysis results and the adjusted propagation direction and boundary conditions, the sound field parameters in the initial sound field model are corrected to obtain the corrected sound field model. The step of calculating the current optimal phase weight matrix based on the corrected sound field model specifically includes: Obtain the expected sound pressure level and sound field uniformity index of the target area; Based on the expected sound pressure level and the sound field uniformity index, an optimization objective function is constructed with the goal of minimizing the sound pressure error in the target area. Based on the corrected sound field model and the optimization objective function, the current optimal phase weight matrix is ​​determined.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the phased array-based directional sound propagation method as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the phased array-based directional sound propagation method as described in any one of claims 1 to 5.

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