What does a remote communication system include?

The long-distance propagation system includes: 1. Telecommunication system, which is composed of hardware and software, mainly including terminal equipment, transmission equipment and switching equipment; 2. Radio broadcast system, which transmits broadcasts by wireless transmission. Equipment; 3. Television broadcast system, a system used for television broadcasting; 4. Computer network system, a system composed of network hardware and network software; 5. Remote conferencing system, a video conferencing system that remotely interacts and shares voice and video images.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What does the long-distance communication system include?

The long-distance communication system includes

1. Telecommunication system

Telecommunication systems (telecommunication systems) are It consists of hardware and software, mainly including terminal equipment, transmission equipment and switching equipment. A telecommunications system is a collection of various coordinated telecommunications equipment. The simplest telecommunication system is a dedicated line system established only between two users, while the more complex system is a system composed of a multi-level switching telecommunication network providing channels in a single call. Regardless of whether it is a simple or complex system, it can be represented by a unified model.

For an actual communication system, in addition to the sending terminal (source), transmission channel and receiving terminal (sink), switching equipment is also needed to provide communication connections between multiple points. The structures and functions of specific equipment in various telecommunications systems are different, and can be abstracted and summarized into a unified model representation. The specific structural composition is shown in Figure 1.

The function of the switching equipment in Figure 1 is: the switching equipment provides transmission channels on demand to form a temporary communication connection between each pair of user terminals in the user group; and can control the signal flow and traffic distribution to achieve sharing Telecommunications facilities and the purpose of improving equipment utilization.

2. Radio broadcasting system

Wireless digital broadcasting is a device that transmits broadcasts through wireless transmission. It has the characteristics of no need for poles and wiring, wide coverage, unlimited expansion, convenient installation and maintenance, low investment, and beautiful sound quality. Therefore, wireless digital broadcasting has advantages that traditional cable broadcasting cannot match.

The intelligent FM broadcast system consists of an intelligent broadcast control system, a digital audio workstation, and an FM transmitting and receiving system. This program is based on the guiding ideology of "advanced and practical" and is designed according to the most advanced wireless broadcasting configuration in my country. Its indicators have reached the level of professional radio stations at the prefectural and municipal levels in my country. According to the characteristics of wireless FM broadcasting, combined with the current situation and development direction of broadcasting in industrial and mining enterprises, we use advanced technologies such as microcomputer phase locking, digital error correction, flash storage, SCA remote control coding, and VB software programming to design a set of domestically leading technology A fully digital intelligent industrial and mining enterprise broadcasting system. The system adopts FM-SCA subcarrier coding remote control technology, uses a radio frequency, and uses subcarriers other than audio carriers to transmit coding control signals. There is no need to apply for control frequencies, which not only saves frequency resources, but also realizes control of terminal points, and improves improve the stability and reliability of the system. With its "high quality, economical, stable and practical" characteristics, the digital intelligent broadcast system can be widely used in industrial and mining enterprise management, industrial and mining enterprise meetings, notification broadcasts and emergency broadcasts in emergencies, etc.

3. Television broadcasting system

TV broadcasting system, a communication term, refers to the system used for television broadcasting.

The application of television broadcasting technology plays a very important role in my country's social development. Therefore, it is necessary to effectively manage my country's terrestrial digital television broadcasting through reasonable management methods.

Transmission scheme:

As a component of the high-definition TV overall group in digital TV transmission technology research, a method jointly proposed by Zhejiang University, Shanghai Jiao Tong University and Xi'an University of Electronic Science and Technology is introduced And developed transmission solutions for advanced digital television broadcasting systems. This solution surpasses existing foreign digital TV standards in function and performance. It can achieve stable wireless fixed, portable and mobile reception of large-capacity broadcast data on the premise of using a civilian-grade tuner, and supports single-frequency networks and co-channels. Forwarding, including efficient digital cable broadcast transmission mode, is easily compatible with foreign standards. This is one of the ideal candidates for my country's digital television broadcasting standards.

The tuner is the physical bottleneck of the digital TV terrestrial broadcasting system

The phase noise, dynamic range, level control range and level control response speed of the tuner are the highest in the digital TV terrestrial broadcasting system Physical bottleneck. The development of tuner technology will be slow and long. Modern digital signal processing technology is difficult to be directly applied to tuners. The system should be designed based on the characteristics of the tuner. This is especially true in chip tuner technology for low power consumption, small size, and high performance.

Signal processing is the core of digital TV terrestrial broadcasting system

By processing the received signal, using the auxiliary information carried in the transmitted signal, and using advanced algorithms to achieve carrier recovery, clock recovery, system synchronization and channel equalization are the core to ensure that the system works normally in a terrestrial broadcast environment. .

Information processing must be combined with signal processing

Information processing includes channel coding (inner code, outer code), interleaving, scrambling and other functions. In most existing communication systems, information processing is independent of signal processing, and signal processing does not receive any help from information processing. In a harsh channel environment, since signal processing does not obtain the gain of information processing, it often cannot provide the normal working environment required for information processing, and it is difficult for the system to obtain optimized performance.

4. Computer network system

The computer network system uses communication equipment and lines to connect multiple devices with different geographical locations and independent functions. A system in which computer systems are interconnected and use fully functional network software to realize resource sharing and information transmission in the network. Through the interconnection of computers, communication between computers is realized, thereby realizing functions such as sharing of information, software and equipment resources and collaborative work between computer systems. Its essential feature is to provide a high degree of sharing of various resources between computers, realizing Conveniently exchange information and exchange ideas.

System features:

The computer network system is composed of network hardware and network software. In network systems, the choice of hardware plays a decisive role in the network, while network software is a tool for tapping the potential of the network.

• The main purpose of establishing a computer network is to share computer resources. Computer resources mainly refer to computer hardware, software and data.

• Interconnected computers are multiple independent "autonomous computers" distributed in different geographical locations. Networked computers can provide services to local users as well as network services to remote users.

• Networked computers follow a common network protocol.

5. Remote conference system

Remote conference system (video conference system, interactive writing system) mainly includes telephone conference and network conference ,videoconference.

Usually remote conferencing systems refer to video conferencing systems, which interactively share voice and video images remotely. For data interaction within the computer, the traditional method is to convert it into video and then transmit it. This method will significantly reduce the image quality and real-time interactivity. With the development of digitization of conference content, interactive writing systems appeared in due course to make up for this shortcoming.

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