A method and system for generating a normalized volume control policy

Abstract

The application relates to the fields of intelligent traffic and public broadcasting, and specifically discloses a standardized volume control strategy generation method and system, which comprises the following steps: obtaining three-dimensional space constraint information and safety early warning event information of a target sound column; calculating space compliance sound power based on the information, and generating a fusion reference acoustic target by combining early warning scenes and point information; mapping the target into a differentiated gain parameter set of a sound column capable of forming a directional sound field; finally, dynamically weighting the parameter set based on the event emergency level and time period identifier, generating and issuing a space-time event joint optimization strategy; the system comprises four functionally corresponding modules. Through intelligent fusion of digital map environment analysis, physical sound field modeling and multi-source business rules, the application realizes the leap of volume control from simple gain adjustment to three-dimensional sound field adaptation and space-time dynamic optimization, effectively solving the core problems of accurate coverage, noise disturbance and automatic execution of standardized standards.

Claims

1. A method for generating a standardized volume control strategy, characterized in that, include: Obtain the scene identifier and emergency level of the safety warning event, the three-dimensional spatial constraints of the sound column, the location type, and the environmental noise data; Based on the scene identifier and point type query specification mapping table, the reference volume is obtained, and the spatial compliance sound power is calculated based on the three-dimensional spatial constraints. The fusion reference acoustic target is then generated. The noise compensation correction is performed by combining the fusion reference acoustic target with environmental noise data, and mapped to a set of differentiated gain parameters to generate an environmental adaptive sound field strategy. Based on the emergency level and time period, the set of differentiated gain parameters is dynamically weighted to generate a spatiotemporal event joint optimization strategy and then distributed.

2. The method for generating a standardized volume control strategy according to claim 1, characterized in that, The acquisition of the scene identifier and emergency level of the safety warning event, the three-dimensional spatial constraints of the sound column, the point type, and the environmental noise data specifically includes: The system receives security alert event information from the video analytics platform via a message queue and parses the predefined specific alert scenario identifier and event urgency level from its structured data fields. Based on the target device ID associated with the security warning event information, query and obtain the installation height, pitch angle, preset effective coverage sector angle, and location type information of the speaker column from the resource management database; Based on the geographic coordinates associated with the target device ID, the digital map model is queried to analyze whether there are acoustic reflectors within the spatial range corresponding to the preset effective coverage sector angle. Information on the existence of acoustic reflective barriers is generated, which, together with the installation height, pitch angle, preset effective coverage sector angle, and the point type information to which they belong, constitutes complete three-dimensional spatial constraint information. The current environmental noise data is obtained by transmitting real-time data streams from noise sensors deployed at the target sound column or at the same location.

3. The method for generating a standardized volume control strategy according to claim 2, characterized in that, The information regarding the existence of the generated acoustic reflection barrier, together with its installation height, pitch angle, preset effective coverage sector angle, and location type, constitutes complete three-dimensional spatial constraint information, specifically including: Obtain the precise geographic coordinates and installation orientation angle of the target device from the resource database based on the target device ID; Using the geographic coordinates as the center and the installation orientation angle as the starting direction, combined with the preset effective coverage sector angle, a three-dimensional sector spatial analysis area is defined in the digital map model; Call the spatial geometry analysis interface of the digital map model to query whether there are any entity models marked with predefined labels as having significant acoustic reflection characteristics within the sector-shaped spatial analysis area; If one or more such entity models are found, it is determined that a sound reflection barrier exists, and the type, average distance relative to the sound column, and orientation information of each model are extracted and combined to generate structured sound reflection barrier existence information; if no model is found, empty information indicating non-existence is generated.

4. The method for generating a standardized volume control strategy according to claim 2, characterized in that, Based on the scene identifier and point type query specification mapping table, the reference volume is obtained; based on the three-dimensional spatial constraints, the spatial compliance acoustic power is calculated; and a fusion reference acoustic target is generated, specifically including: Using the specific warning scenario identifier and location type information as the joint input key, query the preset scenario-location volume standard mapping table to retrieve the corresponding standardized reference volume value; Based on the effective coverage sector angle and installation height in the three-dimensional spatial constraint information, the actual propagation distance of the sound wave to the farthest edge of the sector is calculated; and using the actual propagation distance and the existence information of the sound reflection barrier as input, the spatial compliance sound power required to meet the standard sound pressure level of the target point is calculated according to the sound wave attenuation model. A weighted fusion algorithm is used to fuse the normalized reference volume value and the spatially compliant sound power to generate a unified fusion reference acoustic target.

5. The method for generating a standardized volume control strategy according to claim 4, characterized in that, The calculation of the required spatial compliance sound power to meet the target point standard sound pressure level specifically includes: Based on the installation height and pitch angle, the actual propagation distance of sound from the position of the sound column to the farthest ground edge point defined by the effective coverage sector angle is calculated through geometric projection relationship; Based on the location type information of the target sound column, the volume control standardization standard is queried to determine the standard sound pressure level value of the corresponding location as the expected sound pressure level of the target point; Based on the spherical wave attenuation model, the free field path loss is calculated according to the actual propagation distance; The presence information of the acoustic reflection barrier is analyzed, and based on the type, average distance and orientation of the acoustic reflectors therein, the additional attenuation caused by them to sound wave propagation is evaluated, and an environmental additional loss compensation value is determined. The desired sound pressure level, free-field path loss, and environmental additional loss compensation values ​​are added together to calculate the spatial compliance sound power required for the column source to achieve compliant coverage.

6. The method for generating a standardized volume control strategy according to claim 5, characterized in that, Based on the installation height and pitch angle, the actual propagation distance of sound from the sound column location to the farthest ground edge point defined by the effective coverage sector angle is calculated using geometric projection relationships. Specifically, this includes: Establish a three-dimensional spatial coordinate system with the sound column installation point as the origin, where the Z-axis is perpendicular to the ground and pointing upwards, and the XOY plane is parallel to the ground; Based on the installation height and pitch angle, calculate the projection radius on the XOY plane when the main axis of the sound wave is projected onto the ground; Based on the projection radius and the effective coverage sector angle, determine the point on the ground projection profile of the outer edge of the sector that is farthest from the origin, and calculate the horizontal distance from the origin of the farthest point on the XOY plane. Based on the formula for the distance between two points in three-dimensional space, and combined with the installation height and horizontal distance, the actual propagation distance of the sound from the position of the sound column to the farthest point on the ground is calculated.

7. The method for generating a standardized volume control strategy according to claim 6, characterized in that, Determining an environmental additional loss compensation value specifically includes: Based on the type of acoustic reflector in the acoustic reflection barrier information, query the preset acoustic material reflection loss benchmark table to obtain the benchmark reflection loss value corresponding to the material type. Based on the average distance and orientation of the acoustic reflector, combined with the installation position of the sound column and the effective coverage sector, the proportion of acoustic shadowing area or effective reflection enhancement caused by the reflector to the target coverage area is evaluated by geometric calculation. Based on the proportion of the acoustic shadow zone or the effective reflection enhancement proportion, the reference reflection loss value is adjusted accordingly or its sign is inverted, and the environmental additional loss compensation value is finally calculated and determined.

8. The method for generating a standardized volume control strategy according to claim 4, characterized in that, The fusion benchmark acoustic target is combined with environmental noise data for noise compensation correction, mapped to a set of differentiated gain parameters, and an environmental adaptive sound field strategy is generated, specifically including: According to the preset noise compensation algorithm, the environmental noise data is used to dynamically correct the fusion reference acoustic target, and the noise-corrected acoustic target is generated. Based on the hardware performance parameters of the target sound column, the noise-corrected acoustic target is converted into a reference total gain value required for the sound column to achieve the noise-corrected acoustic target under rated operating conditions. Based on the effective coverage sector angle in the three-dimensional spatial constraint information, N horizontal angular partitions are determined, and the directional radiation efficiency parameter corresponding to each partition is obtained; The reference total gain value is combined with the directional radiation efficiency parameter of each partition to calculate and generate an independent gain value for each partition. All N independent gain values ​​constitute the differentiated gain parameter set. The differentiated gain parameter set is encapsulated with the target sound column identifier and the parameter effective time to generate the environment adaptive sound field strategy.

9. A method for generating a standardized volume control strategy according to claim 8, characterized in that, Based on the aforementioned emergency level and time period, a set of differentiated gain parameters is dynamically weighted to generate and distribute a spatiotemporal event joint optimization strategy, specifically including: Based on the current system time, and referring to the preset social work and rest time division rules, determine the current time period identifier; Using the event urgency level and time period identifier as the combined input key, query the preset dynamic weighting coefficient mapping table to obtain the corresponding dynamic weighting coefficient; The dynamic weighting coefficients are multiplied by each independent gain value in the differentiated gain parameter set in the environmental adaptive sound field strategy to generate an optimized gain parameter set. The environmental adaptive sound field strategy is updated with the optimized gain parameter set to generate the final spatiotemporal event joint optimization strategy; The spatiotemporal event joint optimization strategy is encoded into control instructions in a specific protocol format and sent to the target sound column hardware for execution via a message middleware.

10. A standardized volume control strategy generation system, characterized in that, A method for generating a standardized volume control strategy according to any one of claims 1-9 includes: The information acquisition and analysis module is used to acquire the three-dimensional spatial constraint information and safety warning event information of the target sound column; the three-dimensional spatial constraint information includes at least the installation height, pitch angle, preset effective coverage sector angle, and information on the existence of sound reflection barriers; The fusion computing and decision-making module is used to calculate the spatial compliance acoustic power based on the three-dimensional spatial constraint information, and combine the early warning events and location information received from the information acquisition and analysis module to generate a fusion reference acoustic target. The strategy mapping and generation module is used to map the fusion baseline acoustic target from the fusion computing and decision module into a set of differentiated gain parameters that can drive the sound column to form a directional sound field, and generate an environment-adaptive sound field strategy. The dynamic optimization and execution module is used to dynamically weight the set of differentiated gain parameters from the strategy mapping and generation module based on the event urgency level and time period identifier, generate a spatiotemporal event joint optimization strategy, and issue it for execution.

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