Introduction to videoconference: Basics and Benefits

The advantages of video conferencing

Video conferencing hardware and software enables users to see and hear the person they are communicating.

A video conference you can participate in live audio / video presentations in the classroom, and work with them. Calls can be made between the two classes in the same town or between 2 classrooms in different parts of the world. It 'also possible for multipointconference, where more than 2 schools take part in a single call to adopt.

Live video conferences have many advantages over other multimedia resources such as video recordings or television presentations, but the main advantage is that they are interactive, allowing you to talk to someone in real time, but in a different location. This is great for getting a high degree of student involvement.

Multipointvideoconferencing

Simultaneous videoconferencing among three or more points of distance is possible through a multipoint control unit (MCU). It is a bridge) connects the calls coming from different sources (similar to the popular audio conference call. All parties to call the network ID of the MCU or the MCU can also call the parties involved, in order. There are MCU bridges for IP and ISDN videoconferencing. There are MCUthat pure software, and others a combination of hardware and software. A MCU is characterized by the number of simultaneous calls that can handle.

MCUs can be stand-alone devices or can be incorporated into special units TVC.

The video conferencing technology

The core technology used in a video teleconference (VTC) system is digital compression of audio and video streams in real time.

There arebasically two kinds of VTC systems:

Dedicated systems have all required components packaged into a single device, usually a console with a high-quality video remote-controlled camera on its top. These cameras can be controlled remotely and move in horizontal and vertical directions (horizontal and vertical respectively), as well as to enlarge the image, so they have to play the PTZ cameras. The console contains all electrical interfaces, the control computer, modem, andsoftware or hardware-based codec. Omnidirectional microphones are connected to the console and a TV monitor with speakers and / or video projector. There are several types of dedicated VTC devices:

(A) Large group VTC are not portable, large, expensive devices used for large rooms and halls. The use of PTZ cameras is practically mandatory.

(B) small group VTC are non-mobile or portable, smaller, cheaper devices that are used for small meeeting rooms (for example,up to 10 people) and PTZ cameras to its usual

(C) Individual VTC are usually portable devices, designed for individual users, fixed cameras, microphones and speakers built into the console.

Desktop systems are add-ons (hardware boards, usually) to normal PC, they become VTC devices. A range of different cameras and microphones can be used with the card, which contains the necessary codec and transmission interfaces. Most desktop systems work only with theH.323 standard. Video conferences carried out via dispersed PCs are also known as e-meetings.

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