1. The characteristics of digital conference system
The internal transmission of the system is a digital signal, and the "analog-to-digital" conversion technology is used in the microphones used by the delegates. 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) can access the digital system network directly through the audio media interface.
Meetings of any level can be combined to form a corresponding system by modular selection of equipment that meets the requirements. For the established system, more multimedia devices can also be added, and the control is implemented by computer software to further expand the system.
2. The 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 (ie, a conference system in a general sense), a monitoring alarm subsystem, and a network access subsystem.
Unit equipment components and functions of each subsystem of digital conference system
(1) Central control subsystem
Central control equipment is at the heart of the entire digital conferencing system. It can realize automatic conference control, and can also realize more complicated conference management through computer manipulation. The central control device 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 the speaking device, including the representative machine, the chairman machine, the interpreter station, the dual audio interface device, the multi-function connector, and the like.
② Perform automatic audio equalization processing on the delegate and chairman's speakers.
③ Manage the microphone, request automatic registration of the speech, and operate the microphone that is running, limit the number of participants.
④ Provide the voting function of the meeting. When the chairman of the meeting initiates a vote on a certain item, the representative may manipulate the speaking equipment in front of him to vote, and control, statistics and transmission to the display and representative of the hall through the central control equipment. / Display on the LED screen on the chairman's machine.
⑤ Input and output control of various multimedia audio and video equipment.
(2) Speech and simultaneous interpretation subsystem
Participants participated in the meeting through speaking equipment. Speaker devices typically include wired microphones, voting buttons, LED status displays, and conference audio, as well as other devices to choose from, such as gooseneck conference microphones, wireless lavalier microphones, LCD status displays, language channel selectors, and representative ID cards reader, etc. Simultaneous interpretation equipment mainly includes interpreter desks, interpreter headsets and internal communication telephones.
The speech and simultaneous interpretation subsystem can realize the listening/speaking request of the meeting, registering the speech, receiving the screen display material, participating in the electronic voting, receiving the simultaneous interpretation and talking with other representatives through the internal communication system. Depending on the identity of the delegates, the equipment they receive and the power they assign are also different. The auditing representative can gain the right to listen/see after joining the meeting by application, but has no right to speak.
In particular, it is important to note that the speaking equipment used by the chairperson of the meeting can control the course of speech of other representatives, with the option of allowing speech, refusing to speak or terminating speech. It also has a microphone priority feature that temporarily silences ongoing delegates.
(3) Multimedia projection display subsystem
Today's multimedia conference display devices include television receivers, liquid crystal displays, LCD liquid crystal projectors, and DLP digital projectors. Through the multimedia display device, various digital, text and image materials can be provided to the participants more intuitively, and related information during the meeting can be displayed 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 recorder signal from the venue. These signals are switched through the video distribution of the central control device for switching output display.
(4) Monitoring alarm subsystem
Monitoring equipment includes head-end cameras, pickups and tail-end monitors, hard disk recorders or long-term video recorders. It can collect and record audio and video on the venue. On the one hand, it can monitor the internal situation of the venue for later use. On the other hand, it can also send some signals to the transliteration room to improve the accuracy of translator translation. The camera should have a sound image linkage function, which can automatically track the conference microphones being used in the venue, and take the speakers into the screen to meet the needs of live broadcast and simultaneous interpretation.
(5) Network access subsystem
The network access subsystem uses an ordinary communication network or computer network as the operating environment, and connects the central control equipment of the main venue and the sub-site to realize multi-point digital conference functions in the local and wide-area scope, so that the electronic equipment can be supported during the meeting. Whiteboard dialogue, support for voice, data and image file transfer. The technology and transmission speed of the video network are different.
(6) Video tracking subsystem
Intelligent, practical, user-friendly, advanced microphone-camera linkage tracking function:
A. The microphone ID address can be set freely on site, and the attendant unit can be added or removed at will, and the system expansion can be completed in an instant;
B. The smart remote control quickly sets the microphone ID address, and quickly adjusts and saves the microphone-camera linkage preset position, and the main control panel can also do the above work. The camera always tracks the last speaker when the microphone is turned on. When the microphone is turned off, the camera tracks the previous speaker. When all microphones are turned off, the camera can capture any preset target (such as the venue environment or the rostrum or a specific character). The system supports a single microphone to independently re-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 main panel;
D. In some occasions where the camera tracking target needs to be locked, the camera can be locked by remote control. When any microphone is turned on, the camera is no longer linked, but the camera is still controlled by the remote controller. Perform 4 selection and 1 switch and adjust the camera; when the video tracking function is needed, you can remotely control the key to unlock (restore the video tracking function).
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