The prevention and rapid handling of emergency events is a process of coordinated operations, rapid dispatch, and unified command of various departments to reduce accident losses to a minimum. While relying on various basic communication networks, access to information and ordering are inseparable from multimedia integration. Through fusion, each of the split networks can be connected, and terminals in different communication networks can communicate with the contact center in real time and effectively, and receive command signals synchronously and quickly; through fusion, you can quickly and comprehensively Leaders provide real-time and accurate incident information, effectively improve the timeliness of decision-making, prevent further deterioration of incidents, reduce casualties, property losses and negative impacts, etc.
Multimedia fusion emergency command solution
Emergency command needs to be coordinated across multiple functional management departments such as government, public security, transportation, health, and power. It is difficult to ensure that the leaders of various departments are in front of the video conference terminal in the event of an emergency. Therefore, in the construction of emergency command, how to expand the coverage of emergency conferences and the types of access terminals and integrate them into a complete system is an urgent problem to be solved.
The integration of the three networks, which emerged in the late 1990s, is technically the primary stage of convergence—bearer network convergence, which implements the application of Voice over IP & Video over IP. The characteristic of this type of network is that voice, video, and data are all transmitted on the same network, but they have no relationship at the business or control level. In summary, the integration of the bearer network only changes the transmission channel of the original communication system, unifying the bearer platforms of voice, video, and data applications onto the IP network, thereby reducing the cost of the bearer network; but the maintenance of each subsystem is independent, and There is no business integration.
With the advancement of communication protocol standardization, H.323 and SIP protocols have become standard protocols for various multimedia communications (the Ministry of Public Security has adopted the SIP protocol as the protocol standard for future IP monitoring), which can be adopted by both IP telephone systems and video conferencing systems. Two protocols implement voice and video communication. Therefore, the standardization of communication protocols makes the integration of the three services of voice, video, and monitoring possible, giving new meaning to the integration of the three networks.
1. Surveillance and video system integration
The traditional emergency command monitoring system and the video conference system are relatively independent. The docking of the two systems can only use the original analog transfer method to connect the analog image output by the digital monitoring system to the analog input interface of the video conference terminal. After encoding again, the conference system forwards the image to other conference terminals.
The disadvantage of this scheme is: the image attenuation is large, and the delay is obvious. The image is converted by the two "modulo-digital analog" of the monitoring system and the video conference system (that is, the "monitoring modulus-digital analog" is connected to the "video conference modulus-digital analog"), and the image quality is greatly attenuated, which seriously affects the superior unit. Viewing effect. At the same time, if the image viewed by the leader has a long delay, it will affect the real-time command. Moreover, in the analog switching solution, the video conference management system cannot select and schedule the video source of the monitoring system, and can only notify the monitoring system administrator to provide the corresponding original image to be sent to the video conference for use by telephone, which is very inflexible.
In the modern emergency command multimedia fusion solution, the monitoring system directly sends the digital audio and video data to the video conference system, and only after a "modulo-digital-analog" docking can high-definition images be transmitted to the video conference venues at all levels, avoiding The image attenuation caused by the transfer effectively reduces the delay caused by multiple encoding and decoding. In addition, since the video conference and monitoring systems all use standard control protocols, the videoconferencing system can automatically discover and read the various video sources in the monitoring system, achieve controllable integration, and flexibly read.
2. Integration of voice and video system
Accessing telephones in video conferences is a development trend, which allows IP phones or PSTN fixed telephones, business travellers, or first-line commanders to join the video conference system for two-way audio communication and improve communication flexibility.
Figure 1 shows the basic principle of the fusion of teleconference and video conference. Since the IP network and the PSTN network are two different types of networks, voice gateway equipment is required for connectivity. The voice gateway completes the conversion between the PSTN analog signal and the IP digital signal, and the MCU performs voice and video processing according to the requirements before sending it to the conference venues, which flexibly and simply realizes the intercommunication of the video network and the PSTN network.
Figure 1 Schematic diagram of analog phone joining
3. Converged emergency mobile front end
The implementation of the solution is inseparable from the support of the network. If the front-end front-line area encounters extremely destructive emergencies (such as earthquakes, floods, etc.), once the network is interrupted, the entire system will be paralyzed, which cannot meet the on-site monitoring and scheduling The need for command. In order to avoid such incidents, ECS (Emergency Communication Station) can be used, which condenses the multimedia fusion solution in a box and can be moved portablely.
The ECS emergency mobile communication station is compact and powerful. It has video conferencing, image access, image display, VOIP, multi-service routing and other functions. It can reach the scene of the incident through off-road vehicles, helicopters, and even human handling. Quickly build an emergency mobile command post on site and establish contact with the headquarters command center to achieve communication, data transmission and other functions. Through the built-in WiFi antenna, it can achieve wireless coverage of a certain radius, and meet the functions of wireless camera, wireless video acquisition, multiple WiFi mobile phones, WiFi data terminal access and data return. All multimedia data and ordinary data are aggregated through multi-service function modules. After security measures such as encryption and VPN are guaranteed, they are transmitted back to the emergency command center through the satellite link. In some qualified areas, the satellite link can also be WiMAX , 3G and other wireless links or wired links, emergency mobile communication stations can provide good support for the above links.
The emergence of the ECS emergency mobile communication station makes the emergency command no longer affected by the region, weather, and links, and extends the antenna of the command hall indefinitely, so that the function of multimedia fusion can be maximized.
4. Program features and advantages
Figure 2 Emergency command multimedia integration solution
As shown in Figure 2, the emergency command system includes multiple modules such as video conference, surveillance image access, and emergency voice communication. In actual construction, the complementarity and linkage between several systems are often used to complete the command task.
When an emergency occurs, relevant leaders convene a video conference to make collective decisions with the public security, transportation, health, meteorology and other departments. During the meeting, the monitored event live and historical playback images can be used as a venue to join the meeting, so that the participating departments can quickly understand the cause of the accident, track the development situation of the event in real time, and progress in real-time rescue. On the other hand, the high-definition 1080P dual-stream technology can be used as high-definition auxiliary streams for the analysis data of professional application systems (such as regional meteorological cloud map information, medical treatment point branch geographical location information, etc.), which are remotely presented to the participating departments for decision provide help. In addition, on-site staff can join the meeting via mobile phone, supplement and report comprehensive on-site information, and accept the decision in parallel at the first time.
In summary, the emergency command solution for multimedia integration has the following characteristics:
The whole network adopts digital signal without attenuation; audio and video only undergo coding and decoding once, and the delay is small;
The monitoring system management software is embedded in the video conference system, which can call various video sources of the monitoring system at will;
The video conference system integrates the IP voice communication system to expand the coverage and communication means of the conference system.
Conclusion
The communication systems such as Flying Pigeon, Horn, and Beacon used by the Great Wall of China are already a thing of the past. The emergencies faced by modern human society are becoming more and more complex and serious, but the technological means available are becoming more and more advanced and flexible, allowing us to respond faster and better than the ancients. The linkage of monitoring, video, and voice systems should not only be the stacking of standard equipment, but deep integration on the basis of signaling flow and media flow standardization to achieve a seamless integration at the business level. The solution is multimedia integration, not only in the command center, but also in the emergency mobile front end. Only in this way can the entire emergency command system run more smoothly and effectively.
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