Video Call Conference

Video conferencing is a set of interactive telecommunication technologies which two or more parties in different locations to interact via two-way delivery of audio and video simultaneously. The development of communication technology bring changes in the information delivery process. Forms of information conveyed not only audio but also visual. Video call conferencing using audio and video telecommunications to bring people in different places meeting together. The concept of video conferencing as a conversation between two people (point-to-point) or involve several places (multi-point) with more than one person in a large room in a different place. In addition to audio and visual activities of meetings, video conferencing can be used to share documents, computer information disclosed, and the board.

Simple analog video conferences can be set as the initial discovery of television. Video conferencing systems usually consist of two systems of closed circuit television which is connected via cable. Since the beginning of the first flight into space, NASA uses two radio frequency (UHF or VHF). Television channels routinely use this kind of video conferencing for example, when reporting from distant locations. Then an active connection to the satellite using a truck with special equipment to be rather common.

This technique is very expensive and can not be used for applications such as telemedicine, distance education, and business meetings. Enterprises using the normal telephone network to send slow scan video, such as the first system developed by AT & T, failed mostly due to the lack of picture quality and lack of good video compression techniques efficient. In the 1970s, the greater 1 MHz bandwidth and 6 Mbit / s bit rate of Picturephone but also cause the service to prosper.

In the 1980s, digital telephone transmission networks became possible, such as Integrated Services Digital Networks, or ISDN, assuring a minimum bit host (usually 128 Kbps) for transmission of audio and video compression. A dedicated system first began to appear in the market as ISDN network expansion around the world. In the 1990s, a video teleconferencing system developed rapidly from a very expensive personal equipment, software and network requirements for standards-based technologies are available to the general public at a reasonable cost.

Finally, in the 1990s, the Internet Protocol or IP-based video conferencing becomes possible and the technology is more efficient video compression have been developed to enable a desktop or personal computer-based video conferencing. In 1992, CU-SeeMe developed at Cornell by Tim Dorcey et al., IVS was designed at INRIA, video call conference and the community came to the free service, web plugins and software, such as NetMeeting, MSN Messenger, Yahoo Messenger, SightSpeed, Skype and other -Another brought kindness, despite the low quality.