Intersection signal linkage directional sound beam prompting method, system and device

Abstract

This invention relates to the field of intelligent transportation technology, and in particular to a method, system, and device for directional sound beam prompts linked to traffic signals at intersections. The method includes: acquiring the status information of at least one traffic light corresponding to a pedestrian crossing direction; selecting a corresponding target prompt voice signal based on the status information, and determining a target broadcast area corresponding to the pedestrian crossing direction; processing the target prompt voice signal to form a directional broadcast drive signal for transmission toward the target broadcast area; transmitting a directional sound beam based on the directional broadcast drive signal to provide a voice prompt to the corresponding waiting area when the status information indicates a restriction on passage; providing a voice prompt to the corresponding passage area when the status information indicates that passage is permitted, and independently broadcasting for multiple pedestrian crossing directions. This invention effectively solves the problems of noise pollution, crosstalk between voices from different directions, and insufficient voice clarity in noisy environments present in existing traffic light voice prompts at intersections.

Description

Technical Field

[0001] This invention relates to the field of intelligent transportation technology, and in particular to a method, system and device for directional sound beam prompts linked to intersection signals. Background Technology

[0002] With the development of intelligent transportation, traffic light voice prompt devices at intersections are gradually being applied to scenarios where traffic and pedestrian flow are concentrated and traffic safety requirements are high. Their basic function is to assist pedestrians in recognizing the current traffic status through voice prompts, thereby improving the safety of traffic flow and the level of traffic order management at intersections. In existing technologies, most intersection voice prompts use ordinary loudspeakers for omnidirectional broadcasting, that is, playing a prompt voice synchronously to the surrounding space when the traffic light status changes. While this type of solution can achieve basic reminder functions, the sound spreads in all directions, easily causing noise interference to nearby residential areas, shops, and other environments. Furthermore, in intersections with multiple pedestrian crossing directions, the prompts from different directions are prone to crosstalk and overlap, making it difficult for pedestrians to accurately identify the voice command corresponding to their own direction of travel. In addition, under conditions of strong environmental interference such as vehicle noise, omnidirectional broadcasting generally suffers from dispersed voice energy and reduced intelligibility, which is particularly unfavorable for people who rely on hearing to obtain traffic information. To improve these issues… In addition, existing technologies have proposed directional sound wave technology, which modulates audible speech signals onto high-frequency sound waves and transmits them directionally using a transducer array. This concentrates the sound propagation in a specific area, providing a technical basis for reducing noise diffusion and speech crosstalk. However, existing solutions still lack a complete application mechanism that links with traffic light status, and a mature solution for providing accurate voice prompts for different directions and traffic conditions at intersections has not yet been developed. Therefore, how to intelligently link directional sound wave technology with traffic light status and control it in different directions to effectively solve the problems of noise pollution, speech crosstalk, and insufficient speech clarity in noisy environments in traditional intersection voice prompts has become an urgent technical problem to be solved in this field.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] This invention provides a method, system, and device for directional sound beam prompts linked to intersection signals, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for providing directional sound beam alerts in conjunction with traffic signals at intersections, the method comprising: Obtain the current status information of at least one traffic light corresponding to the direction of pedestrian traffic; Select the corresponding target prompt voice signal based on the status information, and determine the target broadcast area corresponding to the pedestrian's direction of travel; The target prompt voice signal is encoded and modulated to form a directional broadcast drive signal for transmission toward the target broadcast area; Based on the directional broadcast drive signal, a directional sound beam is emitted to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; When the status information indicates that passage is permitted, a voice prompt is given to the corresponding passage area, and multiple directional sound beams are used to independently broadcast the directions of multiple pedestrian passages.

[0006] Furthermore, obtaining the current status information of the traffic light includes obtaining the status information by wired access to the control line of the traffic light, or by receiving a status synchronization signal from the traffic signal controller via wireless communication.

[0007] Furthermore, a corresponding target prompt voice signal is selected based on the status information, including selecting a prohibition voice signal when the status information represents a red light and selecting a permission voice signal when the status information represents a green light.

[0008] Furthermore, determining the target broadcast area corresponding to the pedestrian's direction of travel includes setting the target broadcast area as a pedestrian waiting area or a zebra crossing area located in front of the zebra crossing.

[0009] Furthermore, the target prompt voice signal is encoded and modulated, including modulating the target prompt voice signal onto a high-frequency ultrasonic carrier so that the directional sound beam forms an audible sound wave during air propagation.

[0010] Furthermore, transmitting a directional acoustic beam according to the directional broadcasting drive signal includes beamforming using multiple ultrasonic transducers arranged in a predetermined structure to point the main lobe of the directional acoustic beam toward the target broadcasting area.

[0011] Furthermore, transmitting a directional sound beam according to the directional broadcasting drive signal also includes calibrating the transmission direction of the directional sound beam so that the directional sound beam covers the target broadcasting area and avoids surrounding building areas or other pedestrian areas.

[0012] Furthermore, the preset voice prompt content includes multiple sets of voice prompt content in different languages ​​and / or with different timbres. The step of selecting the corresponding target voice prompt signal according to the status information also includes selecting the target voice prompt content from the multiple sets of voice prompt content.

[0013] A signal-linked directional sound beam alert system for intersections, the system comprising: The status acquisition module acquires the current status information of at least one traffic light corresponding to the pedestrian crossing direction; The sound selection and area determination module selects the corresponding target prompt voice signal based on the status information and determines the target broadcast area corresponding to the pedestrian's direction of travel; The encoding and modulation module encodes and modulates the target prompt speech signal to form a directional broadcast drive signal for transmission toward the target broadcast area; The no-entry announcement module emits a directional sound beam based on the directional announcement drive signal to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; The independent broadcast module provides voice prompts to the corresponding passage area when the status information indicates that passage is permitted, and independently broadcasts the passage directions for multiple pedestrians.

[0014] A directional sound beam alert device linked to a traffic signal is provided, wherein the directional sound beam alert device is used to implement the directional sound beam alert method linked to a traffic signal.

[0015] The technical solution of this invention can achieve the following technical effects: First, the status information of traffic lights corresponding to the pedestrian crossing directions at the intersection is obtained. Then, the corresponding voice prompt content is selected according to the status information and the encoding and modulation processing is completed. Subsequently, the prompt voice is directionally delivered to the corresponding waiting area or passage area through directional sound wave transmission, thereby realizing intelligent voice prompts in different directions and areas in conjunction with the traffic light status. This effectively solves the problems of noise pollution, crosstalk between voices from different directions, and insufficient voice clarity in noisy environments that exist in the existing traffic light voice prompts at intersections.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present 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 only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for directional sound beam alerts linked to intersection signals. Figure 2 A diagram illustrating the difference between regular speakers and directional speakers; Figure 3 A schematic diagram illustrating the process of transmitting a directional acoustic beam based on a directional broadcast drive signal; Figure 4 This is a schematic diagram of a directional sound beam prompting system linked to traffic signals at an intersection. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1; like Figure 1 As shown, this application provides a method for directional sound beam prompting linked to intersection signals, the method including: S10: Obtain the current status information of traffic lights corresponding to at least one pedestrian crossing direction; S20: Select the corresponding target prompt voice signal based on the status information, and determine the target broadcast area corresponding to the pedestrian's direction of travel; S30: Encode and modulate the target prompt voice signal to form a directional broadcast drive signal for transmission toward the target broadcast area; S40: Based on the directional broadcast drive signal, emit a directional sound beam to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; S50: When the status information indicates that passage is permitted, a voice prompt is given to the corresponding passage area, and multiple directional sound beams are used to independently broadcast the directions of multiple pedestrian passages.

[0022] Specifically, in a typical intersection application scenario, directional sound wave voice prompt devices can be installed near the pedestrian waiting areas corresponding to each zebra crossing. The devices are connected to the traffic signal control system and are used to provide voice prompts to pedestrians in the corresponding direction when the traffic signal status changes. In specific implementation, the current status information of at least one traffic signal corresponding to the pedestrian crossing direction is first obtained. The status information can be obtained by connecting to the traffic signal control line via a wired connection or by receiving the status synchronization signal from the traffic signal controller via wireless communication, so as to identify in real time whether the corresponding direction is currently in a restricted or permitted state. After acquiring the status information, the system selects the corresponding target prompt voice signal based on the status information and determines the target broadcast area corresponding to the pedestrian's direction of travel. Specifically, when the status information indicates restricted passage, a "prohibit passage" voice prompt is selected, and the target broadcast area is determined as the pedestrian waiting area in the corresponding direction. When the status information indicates permitted passage, a "permitted passage" voice prompt is selected, and the target broadcast area is determined as the passage area in the corresponding direction. The voice prompt content can be pre-stored in the control device, such as prompts like "Red light, do not cross" and "Green light, please cross," or different languages ​​or voice timbres can be stored according to actual usage needs. Subsequently, the target prompt voice signal is encoded and modulated to form a directional broadcast drive signal for transmission toward the target broadcast area. In specific implementation, the target prompt voice signal can be modulated onto a high-frequency acoustic carrier wave and output to the directional acoustic wave transmitting device after control processing. The directional acoustic wave transmitting device can be a transducer array composed of multiple ultrasonic transducers, which directs the main lobe of the sound wave toward the target broadcast area through beamforming, so that the prompt sound is mainly concentrated in the corresponding waiting area or passage area, while reducing the diffusion to the surrounding non-target areas. After encoding and modulation processing, a directional sound beam is emitted based on the directional broadcast drive signal to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted, and to the corresponding passage area when the status information indicates that passage is permitted. Furthermore, for intersections with multiple pedestrian crossing directions, the corresponding traffic light status information can be obtained for each direction, and the corresponding target prompt voice signal, the corresponding target broadcast area, and the corresponding directional sound beam can be selected respectively. This enables independent broadcasting for multiple pedestrian crossing directions, avoids crosstalk between prompts in different directions, and improves the relevance and clarity of the voice prompts. For example, at an intersection with crosswalks in both the east-west and north-south directions, when the traffic light for the east-west direction is red, the system receives this status information, calls up a voice prompt indicating "no passage," and directs the directional sound beam towards the pedestrian waiting area in front of the east-west crosswalk. When the traffic light for the east-west direction turns green, the system calls up a voice prompt indicating "allow passage" and directs the directional sound beam towards the pedestrian crossing area in the east-west direction. At the same time, the north-south direction can independently execute the same processing procedure based on its own traffic light status, thus achieving voice prompts that do not interfere with each other in different directions.

[0023] The technical solution of this invention first obtains the traffic light status information corresponding to each pedestrian crossing direction at the intersection, then selects the corresponding voice prompt content based on the status information and completes the encoding and modulation processing, and then delivers the prompt voice to the corresponding waiting area or crossing area through directional sound wave transmission, thereby realizing intelligent voice prompts by direction and area in conjunction with the traffic light status, effectively solving the problems of noise pollution, crosstalk between voices from different directions, and insufficient voice clarity in noisy environments that exist in the existing traffic light voice prompts at intersections.

[0024] Furthermore, obtaining the current status information of traffic lights can be achieved by either accessing the control circuit of the traffic lights via a wired connection or by receiving status synchronization signals from the traffic signal controller via wireless communication.

[0025] As a preferred embodiment of the above, obtaining the current status information of traffic lights includes obtaining status information by accessing the control line of the traffic lights via a wired method, or by receiving a status synchronization signal from the traffic signal controller via a wireless communication method. In specific implementation, the wired access method or the wireless communication method can be selected to obtain the status of traffic lights according to the existing layout conditions and renovation requirements of the traffic facilities at the intersection. In one implementation, when using a wired access method, the status information acquisition part can be directly connected to the control line of the traffic light. By identifying the signal changes in the control line, it can determine in real time whether the traffic light for the corresponding pedestrian crossing direction is in a restricted or permitted state, and output the status information to the subsequent processing part. When using this method, status change information can be obtained directly from the traffic light control side, thereby ensuring the timeliness and accuracy of status recognition. In another implementation, when using wireless communication, the traffic signal controller can send a status synchronization signal to the intersection signal linkage directional sound beam prompting device. After receiving the status synchronization signal, the device can parse the current status information of the traffic light corresponding to the pedestrian crossing direction and use the status information for subsequent voice selection, target broadcast area determination, encoding modulation, and directional broadcast control. When using this method, there is no need to directly modify the original control circuit of the traffic light, which is convenient for retrofitting and deployment on the basis of existing intersection facilities. Furthermore, in practical applications, both wired and wireless access methods can be applied to a single pedestrian crossing direction or to multiple pedestrian crossing directions respectively, in order to obtain the current status information of the traffic lights corresponding to each pedestrian crossing direction, thereby providing a basis for subsequently executing voice prompts independently according to different directions.

[0026] Furthermore, the corresponding target prompt voice signal is selected based on the status information, including selecting a prohibition voice signal when the status information indicates a red light and selecting a permission voice signal when the status information indicates a green light.

[0027] As a preferred embodiment of the above, the corresponding target prompt voice signal is selected according to the status information, including selecting a prohibition voice signal when the status information represents a red light and selecting a permission voice signal when the status information represents a green light. In specific implementation, at least two sets of voice prompt content corresponding to the traffic light status can be stored in the storage unit in advance, one set of prohibition voice prompt content used in the restricted passage state and the other set of permission voice prompt content used in the permission passage state. When the system receives the traffic light status information corresponding to the pedestrian passage direction, it identifies and judges the status information and automatically calls the target prompt voice signal that matches the current status from the pre-stored voice prompt content for subsequent encoding, modulation and directional broadcasting. In one implementation, when the status information indicates a red light, a prohibition-type voice signal such as "Red light, do not proceed" or "The light is red, do not proceed" is invoked, and this prohibition-type voice signal is used as the target prompt voice signal. In another implementation, when the status information indicates a green light, a permit-type voice signal such as "Green light, please proceed" or "The light is green, please proceed safely" is invoked, and this permit-type voice signal is used as the target prompt voice signal. Through these methods, automatic switching between the voice prompt content and the traffic light status can be achieved, ensuring that the prompt content remains consistent with the current traffic situation. Furthermore, the prohibition and permission voice signals can be set to multiple sets of voice prompts in different languages ​​and / or with different timbres. After recognizing the passage status corresponding to the status information, the voice prompt category is determined first, and then the target prompt voice signal is selected from the corresponding category, thereby meeting the voice broadcasting needs in different application scenarios. Furthermore, determining the target broadcast area corresponding to the direction of pedestrian traffic includes setting the target broadcast area as the pedestrian waiting area or zebra crossing area in front of the zebra crossing.

[0028] As a preferred embodiment of the above, determining the target broadcast area corresponding to the pedestrian's direction of travel includes setting the target broadcast area as a pedestrian waiting area or a zebra crossing area located in front of the zebra crossing. In specific implementation, the target broadcast area can be switched according to the current traffic status indicated by the traffic lights. When the traffic light status indicates restricted passage, the target broadcast area is determined as the pedestrian waiting area corresponding to the pedestrian's direction of travel, so that the voice prompts mainly affect pedestrians waiting to cross the street. When the traffic light status indicates permitted passage, the target broadcast area is determined as the zebra crossing area corresponding to the pedestrian's direction of travel, so that the voice prompts mainly affect pedestrians entering or crossing the zebra crossing. By setting the broadcast area in correspondence with the traffic status, the voice prompt content can be spatially matched with the pedestrian's location and stage of behavior, thereby improving the pertinence and effectiveness of the prompts. In a typical implementation scenario, directional broadcasting devices can be installed at both ends of each zebra crossing. The target area of ​​the directional sound waves can be pre-divided based on the intersection structure, zebra crossing location, and pedestrian stopping position. The area near the zebra crossing entrance where pedestrians wait to cross can be designated as the pedestrian waiting area, and the area along the crossing path extending from the zebra crossing can be designated as the zebra crossing area. When the system receives red light status information in the corresponding direction, the directional broadcasting direction is directed towards the pedestrian waiting area; when the system receives green light status information in the corresponding direction, the directional broadcasting direction is switched to the zebra crossing area, thereby achieving directional voice prompts for different areas. Furthermore, such as Figure 2 As shown, the determination of the target broadcast area can also be calibrated in conjunction with the propagation direction of the directional sound waves, so that the directional sound waves mainly cover the pedestrian waiting area or zebra crossing area, and avoid shooting towards the surrounding building area or other pedestrian area, so as to reduce the noise impact of non-target areas and the voice crosstalk between different directions.

[0029] Furthermore, the target prompt voice signal is encoded and modulated, including modulating the target prompt voice signal onto a high-frequency ultrasonic carrier so that the directional sound beam forms an audible sound wave during air propagation.

[0030] As a preferred embodiment of the above, the target prompt voice signal is encoded and modulated, including modulating the target prompt voice signal onto a high-frequency ultrasonic carrier so that the directional sound beam forms an audible sound wave during air propagation. In specific implementation, after selecting the corresponding target prompt voice signal according to the traffic light status, the target prompt voice signal is first encoded, and then the encoded voice signal is loaded onto the high-frequency ultrasonic carrier to form a modulation signal suitable for driving the directional sound wave transmitting device for subsequent directional transmission. Specifically, after receiving the status information, the control processing unit calls the voice prompt content corresponding to the current passage status, and performs audio encoding and modulation processing on the voice prompt content to generate a signal suitable for driving the directional sound wave transmitter. In a typical implementation scenario, when the status information corresponding to restricted passage is received, the voice signal of prohibition can be called and digitally modulated before being output. When the status information corresponding to permitted passage is received, the voice signal of permitted passage can be called and digitally modulated before being output, so that the directional sound wave beams subsequently transmitted carry the corresponding voice prompt information. Furthermore, the modulated signal is input to the directional broadcast array, which converts the electrical signal into high-frequency ultrasonic waves and transmits them in the form of directional beams. Since the working principle of directional sound wave technology is to modulate audible speech signals onto high-frequency sound waves, the directional sound beams can form corresponding audible sound waves during air propagation and provide clear voice prompts to pedestrians in the target area, while effectively reducing sound diffusion in non-target areas. In this embodiment, by performing the above-mentioned encoding and modulation processing on the target prompt voice signal, the voice prompt content can be accurately delivered to the target broadcast area by means of directional sound waves, thereby providing a foundation for subsequent implementation of switching broadcast areas according to traffic status, reducing noise interference, and reducing voice crosstalk between different directions.

[0031] Furthermore, such as Figure 3 As shown, a directional acoustic beam is emitted based on a directional broadcast drive signal, including beamforming using multiple ultrasonic transducers arranged in a predetermined structure to direct the main lobe of the directional acoustic beam toward the target broadcast area.

[0032] As a preferred embodiment of the above, transmitting a directional acoustic beam based on a directional broadcasting drive signal includes beamforming using multiple ultrasonic transducers arranged in a predetermined structure to direct the main lobe of the directional acoustic beam toward the target broadcasting area. In specific implementation, a directional broadcasting array composed of multiple ultrasonic transducers can be used as the directional acoustic beam transmitting structure. The multiple ultrasonic transducers are arranged in a predetermined structure and receive a directional broadcasting drive signal formed by encoding and modulation. Under the drive of the directional broadcasting drive signal, high-frequency ultrasonic waves are emitted to form a directional acoustic beam. Specifically, multiple ultrasonic transducers can be arranged in an array within the prompting device, and the emission state of each ultrasonic transducer can be controlled by a beamforming algorithm, so that the sound waves emitted by each transducer form a directional superposition in space, thereby accurately pointing the main lobe of the directional sound beam to a predetermined target broadcasting area. In this way, the voice prompts can be mainly concentrated in the corresponding pedestrian waiting area or zebra crossing area, while reducing the diffusion to the side areas, rear areas and other non-target areas. In a typical implementation scenario, when the traffic light indicates that passage is restricted, the main lobe of the directional sound beam can be pointed towards the pedestrian waiting area in the corresponding direction to provide voice prompts to pedestrians waiting to cross the street; when the traffic light indicates that passage is permitted, the main lobe of the directional sound beam can be switched to point towards the zebra crossing area in the corresponding direction to provide voice prompts to pedestrians entering or crossing the zebra crossing. Furthermore, since the directional broadcast array is composed of multiple ultrasonic transducers arranged in a predetermined structure and the main lobe of the sound wave is directed to the target broadcast area through beamforming, the prompt sound can be concentrated on the target area, which helps to reduce the noise impact on surrounding building areas and pedestrian areas in other directions, and reduces crosstalk between voice prompts in different directions, thereby improving the clarity and relevance of the voice prompts.

[0033] Furthermore, transmitting a directional sound beam based on a directional broadcast drive signal also includes calibrating the transmission direction of the directional sound beam so that the directional sound beam covers the target broadcast area and avoids surrounding building areas or other pedestrian areas.

[0034] As a preferred embodiment of the above, the transmission of a directional sound beam based on the directional broadcast drive signal further includes calibrating the transmission direction of the directional sound beam to ensure that the directional sound beam covers the target broadcast area and avoids surrounding building areas or other pedestrian areas. In specific implementation, after the intersection equipment is installed, the installation orientation and beam direction of the directional sound wave transmitter can be preset and adjusted based on the zebra crossing location, pedestrian waiting area location, and surrounding building distribution. This ensures that the main propagation direction of the directional sound beam is aligned with the target broadcast area corresponding to the pedestrian traffic direction, and avoids transmission towards surrounding building areas or pedestrian areas in other directions as much as possible, so that the voice prompts mainly focus on the target pedestrian area. The transmission direction of the directional sound wave broadcast module is precisely calibrated to cover the pedestrian waiting area in front of the zebra crossing and the zebra crossing area, while avoiding transmission towards surrounding buildings or pedestrian areas in other directions. In one implementation, when the status information indicates restricted passage, the transmission direction of the directional sound beam can be calibrated to cover the pedestrian waiting area in the corresponding direction, so as to provide directional voice prompts to pedestrians waiting to pass; when the status information indicates permitted passage, the transmission direction of the directional sound beam can be calibrated to cover the zebra crossing area in the corresponding direction, so as to provide directional voice prompts to pedestrians entering or crossing the zebra crossing; through the above calibration method, the voice prompts in different passage states can be matched with the actual activity area of ​​pedestrians in terms of spatial position. Furthermore, the calibration of the transmission direction can be achieved by combining multiple ultrasonic transducers arranged in a predetermined structure with beamforming. By controlling the main lobe of the directional sound beam to point towards the target broadcast area, the sound maintains good audibility within the target broadcast area, while rapidly attenuating in the lateral, rear, and other non-target areas, thereby reducing noise propagation and reducing voice crosstalk between different directions. The directional broadcast array consists of multiple ultrasonic transducers arranged in a specific structure, and the main lobe of the sound wave is precisely pointed towards the target area through a beamforming algorithm. In this embodiment, by calibrating the emission direction of the directional sound beam as described above, the directional voice prompts can cover the target broadcast area while avoiding non-target areas, thereby effectively reducing the noise impact on the surrounding environment and improving the relevance and clarity of the voice prompts.

[0035] Furthermore, the preset voice prompt content includes multiple sets of voice prompt content in different languages ​​and / or with different timbres. The corresponding target voice prompt signal is selected based on the status information. It also includes selecting the target voice prompt content from multiple sets of voice prompt content.

[0036] As a preferred embodiment of the above, the preset voice prompt content includes multiple sets of voice prompt content in different languages ​​and / or with different timbres. The corresponding target voice prompt signal is selected based on the status information. The method also includes selecting the target voice prompt content from multiple sets of voice prompt content. In specific implementation, multiple sets of voice prompt content corresponding to the traffic light status can be pre-stored in the storage section of the control device. Each set of voice prompt content semantically corresponds to a restriction prompt and a permission prompt, but they differ in language type, pronunciation style, or timbre characteristics to adapt to the actual usage needs of different intersection scenarios. In one implementation, after obtaining the traffic light status information corresponding to the pedestrian crossing direction, the required voice prompt category is first determined based on the status information. When the status information indicates a restriction on passage, it is determined to be a "prohibit passage" voice prompt; when the status information indicates that passage is permitted, it is determined to be a "permit passage" voice prompt. Subsequently, one set of voice prompt content corresponding to the voice prompt category is selected as the target voice prompt content, and this target voice prompt signal is input into the subsequent encoding, modulation, and directional broadcasting process. Through the above method, flexible selection of voice language type and timbre can be achieved while ensuring that the voice prompt content remains consistent with the current traffic light status. Furthermore, the selection of multiple sets of voice prompt content can be preset according to the intersection deployment environment, user group, or management needs. For example, voice prompt content in one language can be selected in a specific scenario, and voice prompt content in another language can be selected in another scenario, or voice prompt content with different timbres can be selected under different application needs to enhance the adaptability and recognizability of voice prompts. For multiple pedestrian crossing directions at the same intersection, the same or different voice prompt content can also be called separately to meet the application needs when broadcasting independently in each direction. In this embodiment, by pre-storing and selecting multiple sets of voice prompts in different languages ​​and / or with different timbres, the intersection signal linkage directional sound beam prompt method can achieve traffic light status linkage broadcast while having better scene adaptability and voice prompt flexibility.

[0037] Example 2; Based on the same inventive concept as the intersection signal-linked directional sound beam prompting method in the aforementioned embodiments, such as Figure 4 As shown, the present invention also provides an intersection signal-linked directional sound beam prompting system, the system comprising: The status acquisition module acquires the current status information of at least one traffic light corresponding to the pedestrian crossing direction; The sound selection and area determination module selects the corresponding target prompt voice signal based on the status information and determines the target broadcast area corresponding to the pedestrian's direction of travel; The encoding and modulation module encodes and modulates the target prompt speech signal to form a directional broadcast drive signal for transmission toward the target broadcast area; The no-entry announcement module emits a directional sound beam based on the directional announcement drive signal to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; The independent broadcast module provides voice prompts to the corresponding passage area when the status information indicates that passage is permitted, and independently broadcasts the passage directions for multiple pedestrians.

[0038] The system described above in this invention can effectively implement a method for directional sound beam prompting linked to intersection signals, and the technical effects it can achieve are as described in the above embodiments, and will not be repeated here.

[0039] Example 3; Based on the same inventive concept as the intersection signal linkage directional sound beam prompting method in the foregoing embodiments, the present invention also provides an intersection signal linkage directional sound beam prompting device, which is used to implement the intersection signal linkage directional sound beam prompting method.

[0040] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A method for intersection signal linkage directional sound beam prompting, characterized in that, The method includes: Obtain the current status information of at least one traffic light corresponding to the direction of pedestrian traffic; Select the corresponding target prompt voice signal based on the status information, and determine the target broadcast area corresponding to the pedestrian's direction of travel; The target prompt voice signal is encoded and modulated to form a directional broadcast drive signal for transmission toward the target broadcast area; Based on the directional broadcast drive signal, a directional sound beam is emitted to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; When the status information indicates that passage is permitted, a voice prompt is given to the corresponding passage area, and multiple directional sound beams are used to independently broadcast the directions of multiple pedestrian passages.

2. The intersection signal coordinated sound beam prompting method according to claim 1, characterized in that, Obtaining the current status information of the traffic light includes obtaining the status information by wired access to the control line of the traffic light, or by receiving a status synchronization signal from the traffic signal controller via wireless communication.

3. The intersection signal coordinated directional sound beam alerting method according to claim 1, wherein, Selecting the corresponding target prompt voice signal based on the status information includes selecting a prohibition voice signal when the status information represents a red light, and selecting a permission voice signal when the status information represents a green light.

4. The intersection signal coordinated sound beam prompting method according to claim 1, wherein, Determining the target broadcast area corresponding to the pedestrian's direction of travel includes setting the target broadcast area as a pedestrian waiting area or a zebra crossing area located in front of the zebra crossing.

5. The intersection signal coordinated sound beam prompting method according to claim 1, wherein, Encoding and modulation of the target prompt voice signal includes modulating the target prompt voice signal onto a high-frequency ultrasonic carrier so that the directional sound beam forms an audible sound wave during air propagation.

6. The intersection signal-linked directional sound beam cueing method according to claim 1, characterized in that, The directional acoustic beam is emitted according to the directional broadcasting drive signal, including beamforming through multiple ultrasonic transducers arranged in a predetermined structure to point the main lobe of the directional acoustic beam toward the target broadcasting area.

7. The intersection signal coordinated directional sound beam alerting method according to claim 1, wherein, The method of transmitting a directional sound beam according to the directional broadcasting drive signal also includes calibrating the transmission direction of the directional sound beam so that the directional sound beam covers the target broadcasting area and avoids surrounding building areas or other pedestrian areas.

8. The intersection signal coordinated directional sound beam alerting method according to claim 1, wherein, The preset voice prompt content includes multiple sets of voice prompt content in different languages ​​and / or with different timbres. The step of selecting the corresponding target voice prompt signal according to the status information also includes selecting the target voice prompt content from the multiple sets of voice prompt content.

9. An intersection signal linkage directional sound beam prompting system, characterized in that, The system includes: The status acquisition module acquires the current status information of at least one traffic light corresponding to the pedestrian crossing direction; The sound selection and area determination module selects the corresponding target prompt voice signal based on the status information and determines the target broadcast area corresponding to the pedestrian's direction of travel; The encoding and modulation module encodes and modulates the target prompt speech signal to form a directional broadcast drive signal for transmission toward the target broadcast area; The no-entry announcement module emits a directional sound beam based on the directional announcement drive signal to provide voice prompts to the corresponding waiting area when the status information indicates that passage is restricted; The independent broadcast module provides voice prompts to the corresponding passage area when the status information indicates that passage is permitted, and independently broadcasts the passage directions for multiple pedestrians.

10. An intersection signal linkage directional sound beam prompting device, characterized in that, The intersection signal-linked directional sound beam prompting device is used to implement the intersection signal-linked directional sound beam prompting method as described in any one of claims 1-8.

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