Digital conference system system is generally composed of network subsystem, projection display subsystem, sound subsystem, monitoring subsystem, conference speaking subsystem, lighting effect subsystem and central control subsystem. All systems use the computer network as a platform to share data and control information, decentralized operation, and centralized control. The equipment operator can conveniently and quickly monitor and control all equipment.

Today, with the rapid development of technology and society, the amount of information that people occupy and contact in daily life and work is increasing, so the information exchange and communication between people have become more and more frequent and more important. Business negotiations, product demonstrations, guest meetings, government orders, etc. are all exchanges between people. To better achieve their goals, we need to use the means we have always used ------ meetings.

The digital conference system is such a conference automation management system integrating computer, communication, automatic control, multimedia, image, sound and other technologies. The system organically connects the independent subsystems of conference registration, speech, voting, translation, camera, audio, display, network access, etc., and the central control computer coordinates the work of each subsystem according to the conference agenda. Provide the most accurate and real-time information and services for various large-scale international conferences, academic reports and remote conferences.

The digital conference system uses computer, digital and network technology to network various systems. The transmission lines are all digital signals, which not only greatly improves the sound quality, improves the system reliability, but also fundamentally eliminates the interference existing in the general conference system , Distortion, crosstalk and system instability. So that every participant can hear a stable and pure voice. The operation of the system and the process of the meeting are fully controlled, and the system operation and installation are also very simple.

Features and composition of digital conference system

1. Features of Digital Conference System

(1) Digitization

The internal transmission of the system are all digital signals, and the microphones used by the participants all use the "analog-digital" conversion technology. Most unit devices also use analog-to-digital and digital-to-analog converters, so external analog devices (such as broadcast, recording, wired or wireless audio devices, etc.) can directly enter the digital system network through the audio media interface.

(2) Modular

For meetings at any level, the corresponding system can be formed through modular selection of equipment that meets the requirements. You can also add more multimedia devices to the established system, and control it through computer software to further expand the system.

2. Composition of digital conference system

The digital conference system can be composed of a central control subsystem, a multimedia projection display subsystem, a speech and simultaneous interpretation subsystem (that is, a conference system in a general sense), a monitoring and alarm subsystem, and a network access subsystem.

Unit equipment composition and function of each subsystem of digital conference system

1. Central Control Subsystem

Central control equipment is the core of the entire digital conference system. Through it, automatic meeting control can be realized, and it can also be operated by computer to realize more complicated meeting management. The central control equipment mainly controls speech equipment, simultaneous interpretation, electronic voting, video tracking, digital audio and video channels and data channels. Its function is as follows.

(1) Control of speaking equipment, including delegate machine, chairman machine, interpreter desk, dual audio interface, multi-function connector, etc.

(2) Perform automatic audio equalization processing on the speakers of the delegate and the chairman.

(3) Manage microphones, request automatic registration of speaking, unauthorized operation of running microphones, limit the number of participants, etc.

(4) Provide meeting voting function. When the chairman of the conference initiates to vote on a certain matter, the delegate can manipulate the speaking equipment in front of him to vote, and control, statistics, and transmission to the display screen of the hall and the delegate / chairperson through the central control device. Displayed on the LED screen on the machine.

(5) Input and output control of various multimedia audio and video equipment.

2. Speech and simultaneous interpretation subsystem

Participants participate in the meeting through speaking equipment. Speaking equipment usually includes wired microphones, voting buttons, LED status displays and conference audio, and there are other equipment to choose from, such as gooseneck conference microphones, wireless lavalier microphones, LCD status displays, language channel selectors, delegate ID cards Reader etc. Simultaneous interpretation equipment mainly includes an interpreter desk, an interpreter headset and an internal communication telephone.

The speech and simultaneous interpretation subsystem can realize the functions of listening / speaking request of the conference, speech registration, receiving screen display materials, participating in electronic voting, receiving simultaneous interpretation and talking with other representatives through the internal communication system. Depending on the identity of the delegates, the equipment they obtained and the rights they assigned were also different. Observers can get the right to listen / look after joining the meeting by applying, but they have no right to speak.

In particular, it should be pointed out that the speaking equipment used by the chairman of the conference can control the speaking process of other representatives, and can choose to allow speaking, refuse to speak or terminate speaking. It also has a microphone priority function, which can temporarily stop the ongoing delegates speaking.

3. Multimedia projection display subsystem

Current multimedia conference display equipment includes TV receivers, LCD screens, LCD liquid crystal projectors and DLP digital projectors. Multimedia display devices can provide participants with a variety of digital, text and image information, and can also display relevant information in the process of the meeting in real time as needed. The signal source can be a video tape, a computer and a DVD player signal, or a camera signal or a hard disk video recorder signal from the venue. These signals are distributed through the video of the central control device for switching output display.

4. Monitoring and alarming subsystem

Surveillance equipment includes a camera at the head end, a sound pickup device and a monitor at the tail end, a hard disk recorder or a long-term recorder. It can collect and record audio and video on the conference site. On the one hand, it can monitor the internal situation of the conference site for later use. On the other hand, it can also send some signals to the transliteration room to improve the accuracy of the translator's translation. The camera should have the function of sound and image linkage, which can automatically track the conference microphone being used in the conference venue, ingest the speaker into the picture, and meet the needs of live broadcasting and simultaneous interpretation.

5. Network access subsystem

The network access subsystem is to use the ordinary communication network or computer network as the operating environment, connect the central control equipment of the main venue and the branch venue, and realize the multi-point digital conference function in the local and wide area, so that it can support electronic during the meeting. Whiteboard dialogue, support voice, data and image file transfer. The video network access method is different, and the technology and transmission speed used are also different.

There are also some auxiliary equipment that can also play a role in the digital conference. Here are a few simple examples.

(1) Electronic whiteboard: It is as convenient as using a blackboard, but you can instantly print the written content through the printer that comes with the whiteboard.

(2) Electric screen: used with the projector to obtain high-quality large-format images.

(3) On-site lighting: cooperate with the meeting to adjust the on-site environment.

(4) Electric curtains: cooperate with the meeting to control the on-site environment.

6. Video tracking subsystem

Intelligent, practical, user-friendly, advanced microphone-camera linkage tracking function:

A. The microphone ID address can be set at random on the spot, and the attendance unit can be increased or decreased at will, and the system expansion can be completed in an instant;

B. Smart remote controller quickly sets the microphone ID address, and quickly adjusts and saves the microphone-camera linkage preset position, and the main control panel can also complete the above work. When the microphone is turned on to speak, the camera always tracks the last speaker. When the microphone is turned off, the camera tracks the last speaker. When all microphones are turned off, the camera can shoot any preset target (such as the venue environment or the podium or a specific character). The system supports a single microphone to independently adjust the preset position;

C. When any preset position deviates from the speaker, the camera can be quickly adjusted through the dedicated remote control or the system host panel;

D. In some occasions where it is necessary to lock the camera to track the target, you can remotely lock the camera with one key. At this time, turn on any microphone, the camera will no longer be linked to track, but at this time the camera is still controlled by the remote control, and it can still be used as needed 4 to 1 switch and adjust the camera; when the video tracking function is needed, it can be unlocked by remote control with one key (restore the video tracking function).

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