System introduction

The high-definition digital individual unit can upload the on-site image information collected by the high-definition camera to the satellite communication vehicle through a microwave link. It can be transmitted back to the command center through satellite links or 4G links. The satellite communication vehicle and command center can receive new audio and video data uploaded by high-definition digital individual soldiers and can also conduct real-time two-way voice communication with the front-end high-definition individual soldiers. They can listen to real-time voice reports from individual soldiers on site and command and dispatch them, enabling commanders to understand the situation in real time in the command center and providing a strong basis for command decisions. High-definition digital individual soldier equipment can be carried by a single person. It uses a combination of fixed-position cameras (movable) and motion-tracking cameras (movable) to capture high-quality images of important scenes and main parts from different positions and angles in urban, suburban, and mountainous environments. The on-site images and sound signals are wirelessly transmitted to satellite communication vehicles within a range of 1 - 3 kilometers. High-definition digital individual soldier equipment is small in size, light in weight, and flexible in mobility. It can be carried by frontline personnel to reach the scene that satellite communication vehicles cannot reach, achieving fast, safe, and stable transmission of on-site audio and video data.

System composition 

The main equipment of the system includes high-definition digital individual soldier transmitter, handheld camera, voice headset, antenna, back clip and other accessories, as shown in the following figure.

The handheld camera is responsible for collecting on-site video images and is connected to the transmitter via a video cable. The call voice earphone device is connected to the transmitter through an audio cable. The digital single soldier transmitter can encode and modulate the input audio and video data, transforming it into a radio signal. Finally, the signal is transmitted through a radio frequency antenna to upload the signal (audio, video, and positioning data) to the satellite communication vehicle system and command center. The satellite communication vehicle system and command center can send reverse voice signals to the digital individual host. The digital individual host demodulates and decodes the sent voice signals and outputs them through a headset, enabling two-way voice communication between on-site personnel and the satellite communication vehicle and command center. Thus, effective transmission of audio and video in complex environments is realized, and tasks can be completed efficiently.

System function

The high-definition digital single soldier transmitter adopts a portable backpack style and can be combined with a dedicated backpack clip to be carried by on-site personnel. It meets professional broadcasting level standards, featuring adjustable bandwidth, non-line-of-sight transmission, audio and video encryption, high-definition image quality, and other characteristics. It can transmit stable audio and video signals in real time during high-speed movement and in the presence of urban building obstructions. It possesses multiple interfaces such as HD-SDI/HDMI/CVBS.

The external link devices of the high-definition digital individual soldier system are shown in the following figure:

Dynamic Communication Satellite System

The satellite communication vehicle can seamlessly connect with the backend ground station system of the regional public security bureau via satellite links. The vehicle can display real-time on-site image information and other image data collected by multiple cameras on the roof and inside the vehicle, as well as from individual mobile camera equipment, on its on-board screen through wired and wireless communication methods. Simultaneously, this information can be transmitted to the Command Center of the Bazhou Public Security Bureau through the 4G public network system or VSAT satellite communication means.

Audio and video capture unit

The audio and video capture unit consists of a high-definition laser gimbal camera, a rear camera, an in car camera, and a single soldier image transmission. The audio and video acquisition unit mainly consists of wireless microphones, wired microphones, and backpack mounted individual soldiers for real-time acquisition. The image acquisition subsystem utilizes various effective information acquisition methods to monitor and collect various complex scenes, providing real-time and intuitive decision-making information for commanders. The main information collected by the system includes real-time images of the command site, environment, and in vehicle environment.

Display unit

The display unit comprises headrest display, ceiling-mounted display screen, GPS navigation display screen and other devices. It is capable of performing display, playback, and switching control operations on multimedia information such as videos, images, graphics, and data from various sources. For this project, the video display equipment is required to be entirely composed of high-definition devices. The display system presents on-site information on the screen in a visual and intuitive manner, providing auxiliary decision-making support for command and decision-making personnel to grasp the on-site situation and control commands. The signal switching system is used to select and switch between synchronous and asynchronous output of video and audio signals to the display system, audio system, and other systems. It can simultaneously track, preview, and monitor the quality of computer information and video/audio signals. According to application requirements, video/audio signal switching and monitoring systems with different capacities and combinations can be configured. The storage system mainly stores the collected audio and video images in real time for easy access and viewing at any time.

Audio and video processing unit

The traditional implementation method of ordering generally involves multiple subsystems such as audio, video, control, recording, and video conferencing terminals. It adopts a multi-vendor and multi-device stacking implementation method according to their functions. There are the following issues:

•  Multiple vendors: Each subsystem is independent. For a project, it requires coordination with multiple vendors for technical confirmation and order allocation.

• Complex system: Due to incompatibility issues with other systems through wiring, each subsystem is often difficult to coordinate and troubleshoot.

• Large space-to-weight ratio, occupying a large proportion of emergency vehicle space.

The design concept of this highly integrated single audio and video integrated processing platform is to highly integrate the equipment in one cabinet into a unified design, providing lossless display and visualization of multimedia network streams for the local area. It can integrate the collected video and audio signals and computer dynamic screen signals for synchronous recording, live streaming, and on-demand. It can also be managed through an intelligent central control system. The goal of “highly integrated and easy to use” is achieved through a visual centralized control interface and entrance.

System advantages

Highly integrated, merging the following six functions into a single entity. AVCRTM Six in One combines a digital audio processor (A), seamless video mixing (V), programmable central control (C), recording and decoding (R), video conferencing terminal (T), and multi-party interactive MCU.

It offers programmable visual centralized control management operations.

This design saves space, reduces weight, simplifies wiring, and cuts down on complexity.

Visual Integrated Management Unit

The visual comprehensive management unit is primarily employed to implement functions like audio and video scheduling. It is an application software that facilitates the control and management of audio and video integrated processing hosts. The software integrates modules such as centralized management, audio and video control, central control management, and live interactive control. It provides device-embedded GUI, WEB, and WINDOS operation clients.

• Centralized control management: Supports the management of a single or multiple integrated processing hosts.

•  Audio and video control: Supports video drag-and-drop for output switching and centralized control of audio input and output.

• Visual operation: The visual operation interface and open software SDK interface are developed through secondary integration.

• Programmable central control: An open programmable central control that supports multiple interfaces such as RS232/485/IR/IO.

• Live interactive control: Supports one-click live streaming and one-click interaction control, etc.

• Recording management: Supports one-click recording, pause, and stop for single or multiple streams.

  
  

Video conferencing system

The video conferencing system mainly consists of video conferencing terminals, which are utilized for audio and video communication between front-end staff and command center personnel. The video conference terminal employs high-definition codec and features a beautiful split design scheme. Made of all-aluminum material, it has body heat dissipation and is ultra quiet. The system architecture is simple, stable, and reliable, with high cost-effectiveness. At the same time, the design fully considers the application scenarios of satellite channels and adopts industry-leading anti-packet loss technology, enabling it to be effectively used in harsh network environments.