Emergency broadcast control playing method and system based on sound waveform

Abstract

The invention provides an emergency broadcast control playing method and system based on sound waveforms, and relates to the technical field of broadcast control, and the method comprises the following steps: S1, monitoring sound data through a sound collection device; s2, monitoring sound data of current sound acquisition equipment in real time from a first time point, and calculating to obtain a corresponding to-be-judged time period; s3, taking other sound acquisition devices as to-be-judged devices according to the sound data of other sound acquisition devices in the to-be-judged time period; s4, analyzing according to the position relationship between the current sound acquisition equipment and the equipment to be judged and the characteristics of the sound data of the equipment to be judged in the time period to be judged, and obtaining a branch corresponding to the sound destination; and S5, finding out the trifurcate road connected with the branch corresponding to the sound destination according to the branch connection relationship, and controlling the broadcasting equipment to carry out emergency playing early warning.

Description

Technical Field

[0001] The present invention relates to the technical field of broadcast control, and in particular to a sound waveform-based emergency broadcast control and playback method and system. Background Art

[0002] When broadcasting equipment is performing emergency broadcasting, it is generally necessary to prepare a corresponding emergency broadcasting plan in advance according to the event type, broadcasting time, target area and other conditions, and then play it in sequence according to the playlist, which is relatively inaccurate; or manually play it based on the information obtained through active monitoring by the staff, which is relatively cumbersome and inconvenient. It can be seen that the above methods all have shortcomings and cannot accurately control the emergency broadcasting to play, resulting in the inability to obtain clear warning information. Summary of the invention

[0003] The purpose of the present invention is to provide an emergency broadcast control and playback method and system based on sound waveforms, which analyzes and determines the sound location through sound collection equipment set between the branches of a three-way intersection, and controls the broadcasting equipment set at the center of other three-way intersections associated with it to send early warning information based on the analysis and judgment results.

[0004] In order to solve the above technical problems, the present invention adopts the following solutions: A method for controlling and playing emergency broadcasts based on sound waveforms, the method comprising the following steps: S0. Obtain the connection relationship between the branches of the three-way intersection according to the map of the target area, wherein the branches of the three-way intersection are provided with sound collection devices, and the distance between the sound collection devices and the center of the three-way intersection is equal; S1, monitoring the sound data through the sound collection device, if the sound data detected on the current sound collection device exceeds the threshold, the current time point is taken as the first time point, and the process goes to step S2; S2, monitoring the sound data of the current sound collection device in real time from the first time point, and when the sound data of several consecutive time points are all within the daily area, calculating the corresponding time period to be determined; S3, extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, taking other sound collection devices as the devices to be determined according to the sound data of other sound collection devices in the time period to be determined, and then going to step S4; S4, analyzing the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtaining a branch corresponding to the sound destination; S5. Find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

[0005] Furthermore, in S1, the process of monitoring the sound data by the sound collection device is: The sound of the three-way intersection is collected by a sound collection device, and the collected sound is processed by audio. The amplitude and time point of the sampling point are obtained in real time according to the sampling frequency, and a sound waveform is obtained by plotting the amplitude and time point of the sampling point; the amplitude of the sampling point on the sound waveform is monitored, and when it is detected that the amplitude exceeds a threshold, the corresponding time point is used as the first time point.

[0006] Further, in S2, the daily area is the minimum amplitude interval preset in advance on the sound waveform diagram, and the process of real-time monitoring of the sound data of the current sound collection device from the first time point is: The amplitude of the sampling point on the sound waveform corresponding to the current sound collection device is monitored in real time from the first time point. When the amplitudes of several consecutive time points on the sound waveform are all within the minimum amplitude interval, a time point in the minimum amplitude interval is selected as the second time point, and the time period between the first time point and the second time point is used as the time period to be determined.

[0007] Furthermore, the step S3 includes the following steps: S30, starting from the current sound collection device at the fork in the road, using the sound collection devices on both sides thereof as the other current sound collection devices; S31, extracting the amplitude data corresponding to the time period to be determined on the sound waveform diagram of other current sound collection devices; S32, determining whether the amplitude change corresponding to the time period to be determined on the sound waveform of other sound collection devices currently has a rising stage, if so, proceeding to step S33; S33, respectively calculating the maximum amplitude difference of other current sound collection devices corresponding to the time period to be determined on the sound waveform diagram, and judging whether the maximum amplitude difference is greater than the minimum preset value, if so, taking the other current sound collection devices as the devices to be determined, and going to step S4.

[0008] Furthermore, the step S4 includes the following steps: S41, finding the time point corresponding to the maximum amplitude on the sound waveform of the current sound collection device, and dividing the time period to be determined into a front time period and a rear time period according to the time point; S42, finding the time point corresponding to the maximum amplitude on the sound waveform of the device to be determined, matching the time point with the corresponding time period to be determined, and obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period; S43, judging whether the device to be determined whose time point falls in the previous time period meets the judgment condition, and obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be determined.

[0009] Further, in S43, the process of determining whether the device to be determined whose time point falls in the previous time period meets the determination condition is as follows: Determine whether the amplitude change corresponding to the time period to be determined on the sound waveform graph of the device to be determined whose time point falls in the previous time period has a descending phase, and if so, calculate the absolute value of the slope of the descending phase; In addition, the absolute value of the slope of the latter time period is calculated and compared with the absolute values ​​of the two slopes. When the absolute value of the slope of the descending phase is smaller than the absolute value of the slope of the latter time period, it is judged that the device to be determined whose time point falls in the former time period meets the judgment conditions; when the absolute value of the slope of the descending phase is larger than the absolute value of the slope of the latter time period, it is judged that the device to be determined whose time point falls in the former time period does not meet the judgment conditions.

[0010] Furthermore, the process of obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be judged is as follows: When the device to be determined whose time point falls in the previous time period meets the determination conditions, the branch between the current sound collection device and the device to be determined whose time point falls in the later time period is marked as the branch corresponding to the sound destination; when the device to be determined whose time point falls in the previous time period does not meet the determination conditions, the branch between the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the previous time period is marked as the branch corresponding to the sound destination.

[0011] Further, in S42, after obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period, the branch between the current sound collection device and the device to be determined whose time point falls in the earlier time period is marked as the branch corresponding to the source of the sound.

[0012] Further, in S5, the broadcasting equipment set up in the center of other three-way intersections is controlled to issue an early warning. The early warning refers to controlling the broadcasting equipment set up in the center of other three-way intersections to play early warning information for reminding tourists. The early warning information includes audio information of high traffic volume on the branch road corresponding to the sound location.

[0013] An emergency broadcast control and playback system based on sound waveform, applying the emergency broadcast control and playback method based on sound waveform, comprising: A branch connection relationship acquisition module: obtains the branch connection relationship between three-way forks according to a map of the target area, wherein sound collection devices are provided between the branches of the three-way forks, and the distance between the sound collection devices and the center of the three-way forks is equal; Sound monitoring module: monitors sound data through a sound collection device. If the sound data detected on the current sound collection device exceeds the threshold, the current time point is used as the first time point; The module for obtaining the time period to be determined is used to monitor the sound data of the current sound collection device in real time from the first time point. When the sound data of several consecutive time points are all within the daily area, the corresponding time period to be determined is calculated. Device acquisition module to be determined: extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, and taking other sound collection devices as devices to be determined according to the sound data of other sound collection devices in the time period to be determined; Sound location calculation module: analyzes the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtains the branch corresponding to the sound location; Emergency module: find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

[0014] Beneficial effects of the present invention: The present invention provides an emergency broadcast control and playback method and system based on sound waveform, which changes the fixed playback form of existing emergency broadcasts into selecting broadcast equipment based on sound waveforms to send accurate warning information, and can flexibly warn people according to crowd flow. It is mainly used in scenic spots, and can avoid crowd congestion on the roads in scenic spots during holidays due to a large number of tourist groups, thereby preventing trampling incidents. Specifically, the emergency broadcast control and playback method mainly collects the sound generated by the crowd on the three-way intersection through the sound collection equipment arranged between the branches of the three-way intersection to form a sound waveform, and then performs feature analysis on the sound waveform generated by the crowd based on the different walking directions, so as to analyze and judge the sound location of the three-way intersection, and control the broadcast equipment arranged in the center of other three-way intersections associated with it to send warning information according to the analysis and judgment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a flow chart of a method for controlling and playing emergency broadcasts based on sound waveforms in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a sound collection device arranged on a three-way intersection in Example 1 of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0018] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0019] Additionally, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness.One of ordinary skill in the art will recognize that various changes and modifications may be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0020] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments: Example 1 At present, there are usually many tour groups in scenic spots during holidays, especially some sunset tour groups. Not only are there a large number of people, but they are usually led by tour leaders to act in a unified manner to avoid accidents. However, a large number of people acting in a unified manner can easily cause crowd congestion on the roads during peak hours, and crowd congestion is a major cause of trampling incidents, so this phenomenon needs to be avoided as much as possible.

[0023] In order to solve the above problems, the characteristics of a large number of people in a tour group acting in unison are considered. First, in actual scenarios, when a large number of people act in unison, a loud sound will be generated. In addition, in a tour group, the tour leader usually uses a loudspeaker to call the tour group members or introduce the scenic spots to prevent people from getting lost. This scenario will also generate a loud sound. Therefore, in this embodiment, a method for controlling the playback of emergency broadcasts based on sound waveforms is provided, such as Figure 1 As shown, the following steps are included: S0, obtaining the branch connection relationship between the three-way fork according to the map of the target area; S1, monitoring the sound data through the sound collection device, if the sound data detected on the current sound collection device exceeds the threshold, the current time point is taken as the first time point, and the process goes to step S2; S2, monitoring the sound data of the current sound collection device in real time from the first time point, and when the sound data of several consecutive time points are all within the daily area, calculating the corresponding time period to be determined; S3, extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, taking other sound collection devices as the devices to be determined according to the sound data of other sound collection devices in the time period to be determined, and then going to step S4; S4, analyzing the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtaining a branch corresponding to the sound destination; S5. Find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

[0024] Specifically, the three-way intersection refers to the intersection of three branches. It is troublesome to manually analyze the destination of tourists at this intersection, while for the intersection with two branches, the destination of tourists is relatively easy to obtain. Therefore, in this embodiment, the sound collection device is mainly set for the three-way intersection that often appears in the scenic area, so as to perform sound collection and analysis, and then control the broadcasting device to play targeted sounds according to the results of the sound collection and analysis. Among them, the broadcasting device can be set at the center of the three-way intersection. By adjusting the distance between the sound collection device and the broadcasting device and the volume of the sound played by the broadcasting device, the sound played by the broadcasting device will not have a significant impact on the sound collection device.

[0025] The sound collection device can be a device such as a sound receiving microphone. The sound collection device is arranged between the branches of the three-way intersection, that is, the three sound collection devices are respectively arranged at the angles between the branches, and the sound generated by the three-way intersection is collected by the three sound collection devices. Since the propagation of sound is diffused to all sides, the distance between the position where the sound is generated and the three sound collection devices will also affect the sound waveform collected by the sound collection device. Therefore, in this embodiment, if Figure 2 As shown, the distance d between the three sound collection devices and the center of the three-way intersection is equal, and the sound collection devices are all arranged on an arc with the center of the three-way intersection as the center. The best situation is that the angles of the three branches are equal and the three sound collection devices are arranged on the bisector of the angles, so that the distances between the sound collection devices and the branches are also equal, eliminating the influence of distance on the sound volume. By analyzing the sound waveforms collected by the three sound collection devices, the location where the sound is generated can be clearly known.

[0026] In one embodiment, in S1, the process of monitoring the sound data by the sound collection device is: The sound of the three-way intersection is collected by a sound collection device, and the collected sound is processed by audio. The amplitude and time point of the sampling point are obtained in real time according to the sampling frequency, and a sound waveform is obtained by plotting the amplitude and time point of the sampling point; the amplitude of the sampling point on the sound waveform is monitored, and when it is detected that the amplitude exceeds a threshold, the corresponding time point is used as the first time point.

[0027] Specifically, when the sound of a three-way road is collected by a sound collection device, the duration information of the audio file and the amplitude information of each sampling point can be obtained through the sampling frequency, and the amplitude information of the sampling point is normalized. The amplitude size of each sampling point can be between 0 and 255. The amplitude information of a sampling point is converted to a pixel point on the image, and the time point of the sampling point is used as the horizontal coordinate information of the image pixel point, and the amplitude information of the sampling point is used as the vertical coordinate information of the image pixel point. Adjacent pixel points drawn on the image are connected with a smooth curve to obtain a sound waveform.

[0028] In one embodiment, in S2, the daily area is a minimum amplitude interval preset in advance on the sound waveform graph, and the process of real-time monitoring of the sound data of the current sound collection device from the first time point is: The amplitude of the sampling point on the sound waveform corresponding to the current sound collection device is monitored in real time from the first time point. When the amplitudes of several consecutive time points on the sound waveform are all within the minimum amplitude interval, a time point in the minimum amplitude interval is selected as the second time point, and the time period between the first time point and the second time point is used as the time period to be determined.

[0029] Specifically, when the sound data detected on the sound collection device exceeds the threshold, it may indicate that the sound generated at a closer location to the current sound collection device is louder, and the flow of people near the current sound collection device is larger. The threshold may be preset according to the sound generated during a period of high crowd flow in the scenic area, and the threshold may be used to trigger the sound collection device to conduct a location analysis on the crowd that generates the louder sound.

[0030] When the amplitudes of several consecutive time points on the sound waveform are all within the minimum amplitude interval, it can indicate that no loud sound is generated near the current sound collection device, that is, the crowd with a large flow has moved away from the current sound collection device. The minimum amplitude interval refers to an interval range that includes a preset minimum amplitude. The preset minimum amplitude can be preset according to the sound generated during the closing period of the scenic spot or the period with less crowd flow. The minimum amplitude can be used to obtain the time period when a large crowd passes by the current sound collection device, that is, the time period to be determined.

[0031] In one embodiment, step S3 includes the following steps: S30, starting from the current sound collection device at the fork in the road, using the sound collection devices on both sides thereof as the other current sound collection devices; S31, extracting the amplitude data corresponding to the time period to be determined on the sound waveform diagram of other current sound collection devices; S32, determining whether the amplitude change corresponding to the time period to be determined on the sound waveform of other sound collection devices currently has a rising stage, if so, proceeding to step S33; S33, respectively calculating the maximum amplitude difference of other current sound collection devices corresponding to the time period to be determined on the sound waveform diagram, and judging whether the maximum amplitude difference is greater than the minimum preset value, if so, taking the other current sound collection devices as the devices to be determined, and going to step S4.

[0032] Specifically, in Figure 2 There are three sound collection devices S1, S2, and S3. If the current sound collection device is S1, the sound collection devices S2 and S3 on both sides of it are used as the other current sound collection devices, and the amplitude data corresponding to the time period to be determined on the sound waveform graph of the two are extracted, and it is determined whether the amplitude change of the amplitude data has a rising stage. The rising stage refers to the amplitude of several consecutive time points in the time period increasing successively, indicating that the other current sound collection devices also have a time period of increased sound due to the passing of crowd flow, and further analysis can be performed on this time period.

[0033] If other sound collection devices do not currently produce an ascending stage, it means that the sound produced at the current sound collection device S1 has no effect on the sound collection devices on both sides. It may be that the sound has not moved, but has only increased and then decreased at the current sound collection device S1. It may also be that there is a problem with the sound collection devices on both sides and they need to be repaired. At this time, the staff can make an active judgment.

[0034] In addition, the minimum preset value can also be preset according to the sound generated during the period with high crowd flow in the scenic area. When the maximum amplitude difference corresponding to the time period to be determined on the sound waveform diagram of other sound collection devices is less than the minimum preset value, it can also indicate that the increase in sound collected by the other sound collection devices is not caused by a large flow of people passing by, but may be the noise at the location itself.

[0035] In one embodiment, step S4 includes the following steps: S41, finding the time point corresponding to the maximum amplitude on the sound waveform of the current sound collection device, and dividing the time period to be determined into a front time period and a rear time period according to the time point; S42, finding the time point corresponding to the maximum amplitude on the sound waveform of the device to be determined, matching the time point with the corresponding time period to be determined, and obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period; S43, judging whether the device to be determined whose time point falls in the previous time period meets the judgment condition, and obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be determined.

[0036] In one embodiment, in S43, the process of determining whether the device to be determined whose time point falls in the previous time period meets the determination condition is as follows: Determine whether the amplitude change corresponding to the time period to be determined on the sound waveform graph of the device to be determined whose time point falls in the previous time period has a descending phase, and if so, calculate the absolute value of the slope of the descending phase; In addition, the absolute value of the slope of the latter time period is calculated and compared with the absolute values ​​of the two slopes. When the absolute value of the slope of the descending phase is smaller than the absolute value of the slope of the latter time period, it is judged that the device to be determined whose time point falls in the former time period meets the judgment conditions; when the absolute value of the slope of the descending phase is larger than the absolute value of the slope of the latter time period, it is judged that the device to be determined whose time point falls in the former time period does not meet the judgment conditions.

[0037] Specifically, in Figure 2There are three sound collection devices S1, S2, and S3 in the figure. If the current sound collection device is S1, the sound collection devices S2 and S3 on both sides of it are taken as the current devices to be determined, and the branch 1 between the current sound collection device S1 and the current device S2 to be determined, the branch 2 between the current sound collection device S2 and the current device S3 to be determined, and the branch 3 between the current sound collection device S3 and the current device S1 to be determined are obtained. If a crowd with a large flow of people walks from branch 1 to branch 2, it can be seen that the current device S2 to be determined is a device to be determined whose time point falls in the previous time period, and the current device S3 to be determined is a device to be determined whose time point falls in the later time period. Then, the absolute value of the slope of the current device S2 to be determined in the descending stage and the absolute value of the slope of the current sound collection device S1 in the later time period are calculated. Since the sound destination is branch 2, and the current device S2 to be determined is close to branch S2, it can be obtained that the rate of decrease of the maximum amplitude at the current sound collection device S1 is faster than the rate of decrease of the maximum amplitude at the current device S2 to be determined.

[0038] Based on the above principle, by comparing the slope of the amplitude of the descending phase of the device to be determined that falls on the front time period with the slope of the amplitude of the descending phase of the current sound collection device in the back time period, the sound location of the crowd that currently produces a loud sound can be analyzed. For example, if the absolute value of the slope of the amplitude of the current sound collection device S1 in the back time period is greater than the absolute value of the slope of the amplitude at the current device to be determined S2, it means that the sound of the crowd is going to branch 2; if the absolute value of the slope of the amplitude of the current sound collection device S1 in the back time period is smaller than the absolute value of the slope of the amplitude at the current device to be determined S2, it means that the sound of the crowd is going to branch 3.

[0039] In one embodiment, the process of obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be judged is as follows: When the device to be determined whose time point falls in the previous time period meets the determination conditions, the branch between the current sound collection device and the device to be determined whose time point falls in the later time period is marked as the branch corresponding to the sound destination; when the device to be determined whose time point falls in the previous time period does not meet the determination conditions, the branch between the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the previous time period is marked as the branch corresponding to the sound destination.

[0040] In one embodiment, in S42, after obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period, the branch between the current sound collection device and the device to be determined whose time point falls in the earlier time period is marked as the branch corresponding to the source of the sound.

[0041] In one embodiment, in S5, the broadcasting equipment set up in the center of other three-way intersections is controlled to issue an early warning, and the early warning refers to controlling the broadcasting equipment set up in the center of other three-way intersections to play early warning information for reminding tourists, and the early warning information includes audio information of high traffic volume on the branch road corresponding to the sound location.

[0042] In summary, the present invention provides an emergency broadcast control playback method and system based on sound waveform, which changes the fixed playback form of existing emergency broadcasts to select broadcast equipment based on sound waveforms to send accurate warning information, and can provide flexible warnings for crowd flow. It is mainly used in scenic spots, and can avoid traffic congestion in scenic spots during holidays due to a large number of tourist groups, thereby preventing stampedes.

[0043] Example 2 An emergency broadcast control and playback system based on sound waveform, applying the emergency broadcast control and playback method based on sound waveform, comprising: A branch connection relationship acquisition module: obtains the branch connection relationship between three-way forks according to a map of the target area, wherein sound collection devices are provided between the branches of the three-way forks, and the distance between the sound collection devices and the center of the three-way forks is equal; Sound monitoring module: monitors sound data through a sound collection device. If the sound data detected on the current sound collection device exceeds the threshold, the current time point is used as the first time point; The module for obtaining the time period to be determined is used to monitor the sound data of the current sound collection device in real time from the first time point. When the sound data of several consecutive time points are all within the daily area, the corresponding time period to be determined is calculated. Device acquisition module to be determined: extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, and taking other sound collection devices as devices to be determined according to the sound data of other sound collection devices in the time period to be determined; Sound location calculation module: analyzes the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtains the branch corresponding to the sound location; Emergency module: find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for controlling emergency broadcasting based on sound waveform, characterized in that: The emergency broadcast control playing method comprises the following steps: S0. Obtain the connection relationship between the branches of the three-way intersection according to the map of the target area, wherein the branches of the three-way intersection are provided with sound collection devices, and the distance between the sound collection devices and the center of the three-way intersection is equal; S1, monitoring the sound data through the sound collection device, if the sound data detected on the current sound collection device exceeds the threshold, the current time point is taken as the first time point, and the process goes to step S2; S2, monitoring the sound data of the current sound collection device in real time from the first time point, and when the sound data of several consecutive time points are all within the daily area, calculating the corresponding time period to be determined; S3, extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, taking other sound collection devices as the devices to be determined according to the sound data of other sound collection devices in the time period to be determined, and then going to step S4; S4, analyzing the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtaining a branch corresponding to the sound destination; S5. Find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

2. The method for controlling emergency broadcasting based on sound waveform according to claim 1, characterized in that: In S1, the process of monitoring the sound data through the sound collection device is: The sound of the three-way intersection is collected by a sound collection device, and the collected sound is processed by audio. The amplitude and time point of the sampling point are obtained in real time according to the sampling frequency, and a sound waveform is obtained by plotting the amplitude and time point of the sampling point; the amplitude of the sampling point on the sound waveform is monitored, and when it is detected that the amplitude exceeds a threshold, the corresponding time point is used as the first time point.

3. The method for controlling emergency broadcasting based on sound waveform according to claim 2, characterized in that: In S2, the daily area is the minimum amplitude interval preset in advance on the sound waveform diagram, and the process of real-time monitoring of the sound data of the current sound collection device from the first time point is: The amplitude of the sampling point on the sound waveform corresponding to the current sound collection device is monitored in real time from the first time point. When the amplitudes of several consecutive time points on the sound waveform are all within the minimum amplitude interval, a time point in the minimum amplitude interval is selected as the second time point, and the time period between the first time point and the second time point is used as the time period to be determined.

4. The method for controlling emergency broadcasting based on sound waveform according to claim 2, characterized in that: The step S3 includes the following steps: S30, starting from the current sound collection device at the fork in the road, using the sound collection devices on both sides thereof as the other current sound collection devices; S31, extracting the amplitude data corresponding to the time period to be determined on the sound waveform diagram of other current sound collection devices; S32, determining whether the amplitude change corresponding to the time period to be determined on the sound waveform of other sound collection devices currently has a rising stage, if so, proceeding to step S33; S33, respectively calculating the maximum amplitude difference of other current sound collection devices corresponding to the time period to be determined on the sound waveform diagram, and judging whether the maximum amplitude difference is greater than the minimum preset value, if so, taking the other current sound collection devices as the devices to be determined, and going to step S4.

5. The method for controlling emergency broadcasting based on sound waveform according to claim 2, characterized in that: The step S4 includes the following steps: S41, finding the time point corresponding to the maximum amplitude on the sound waveform of the current sound collection device, and dividing the time period to be determined into a front time period and a rear time period according to the time point; S42, finding the time point corresponding to the maximum amplitude on the sound waveform of the device to be determined, matching the time point with the corresponding time period to be determined, and obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period; S43, judging whether the device to be determined whose time point falls in the previous time period meets the judgment condition, and obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be determined.

6. The method for controlling and playing emergency broadcasts based on sound waveform according to claim 5, characterized in that: In S43, the process of determining whether the device to be determined whose time point falls in the previous time period meets the determination condition is as follows: Determine whether the amplitude change corresponding to the time period to be determined on the sound waveform graph of the device to be determined whose time point falls in the previous time period has a descending phase, and if so, calculate the absolute value of the slope of the descending phase; Furthermore, the absolute value of the slope of the latter time period is calculated, and the absolute values ​​of the slopes of the two are compared. When the absolute value of the slope of the descending stage is smaller than the absolute value of the slope of the latter time period, it is determined that the device to be determined whose time point falls in the former time period meets the determination condition; When the absolute value of the slope in the descending phase is greater than the absolute value of the slope in the later time period, it is determined that the device to be determined whose time point falls in the earlier time period does not meet the determination condition.

7. The method for controlling emergency broadcasting based on sound waveform according to claim 5, characterized in that: The process of obtaining the branch corresponding to the sound destination according to the judgment result and the positional relationship between the current sound collection device and the device to be judged is as follows: When the device to be determined whose time point falls in the previous time period meets the determination condition, the branch between the current sound collection device and the device to be determined whose time point falls in the later time period is marked as the branch corresponding to the sound destination; When the device to be determined whose time point falls in the former time period does not meet the determination conditions, the branch between the device to be determined whose time point falls in the latter time period and the device to be determined whose time point falls in the former time period is marked as the branch corresponding to the sound destination.

8. The method for controlling emergency broadcasting based on sound waveform according to claim 5, characterized in that: In S42, after obtaining the device to be determined whose time point falls in the later time period and the device to be determined whose time point falls in the earlier time period, the branch between the current sound collection device and the device to be determined whose time point falls in the earlier time period is marked as the branch corresponding to the source of the sound.

9. The method for controlling and playing emergency broadcasts based on sound waveform according to claim 1, characterized in that: In S5, the broadcasting equipment set up in the center of other three-way intersections is controlled to issue an early warning. The early warning refers to controlling the broadcasting equipment set up in the center of other three-way intersections to play early warning information for reminding tourists. The early warning information includes audio information of high pedestrian flow on the branch road corresponding to the sound location.

10. An emergency broadcast control and playback system based on sound waveform, characterized in that: The method for controlling and playing emergency broadcasts based on sound waveforms as described in any one of claims 1 to 9 comprises: A branch connection relationship acquisition module: obtains the branch connection relationship between three-way forks according to a map of the target area, wherein sound collection devices are provided between the branches of the three-way forks, and the distance between the sound collection devices and the center of the three-way forks is equal; Sound monitoring module: monitors sound data through a sound collection device. If the sound data detected on the current sound collection device exceeds the threshold, the current time point is used as the first time point; The module for obtaining the time period to be determined is used to monitor the sound data of the current sound collection device in real time from the first time point. When the sound data of several consecutive time points are all within the daily area, the corresponding time period to be determined is calculated. Device acquisition module to be determined: extracting the sound data of other sound collection devices in the time period to be determined from the current sound collection device on both sides of the three-way intersection, and taking other sound collection devices as devices to be determined according to the sound data of other sound collection devices in the time period to be determined; Sound location calculation module: analyzes the positional relationship between the current sound collection device and the device to be determined and the characteristics of the sound data of the device to be determined in the time period to be determined and obtains the branch corresponding to the sound location; Emergency module: find other three-way intersections connected to the branches corresponding to the sound location according to the branch connection relationship, and control the broadcasting equipment set up in the center of other three-way intersections to issue an early warning.

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