In Net Telephony, we can only talk to others and cannot see them. With video conferencing, users can speak and see each other as well. We need a PC with Internet access for video conferencing, a digital camera that is correctly installed and connected to the PC, and video conferencing applications like Microsoft Net-Meeting.
The Input device, camera, and microphone capture the audio and video data from one end and convert it to a suitable format. Then the transformed data is transmitted over the Internet. At the remote end, the signal is converted to its original form.
MULTI-POINT VIDEO CONFERENCING
Video conferencing helps more than two participants to interact with each other in various locations by communicating and hearing each other as if they were sitting together. All participants have a video camera, microphone, and speakers at their end.
The important factor for video conferencing is the speed of the Internet connectivity. The higher the speed, the lesser will be the delay and the better the sound and video quality. Compared to net telephony, video conferencing requires more costly hardware and better Internet connectivity.
Some applications of video conferencing are:
- Big organizations having offices worldwide use Video Conferencing to hold important meetings and training across its various offices.
- Distance learning uses Video Conferencing to simulate a classroom environment where, students located in different parts of the world, see the teacher, and listen to him.
- Television broadcasting organizations use Video Conferencing showing a TV newsreader interact with a reporter at a far-off place about the events happening to its viewers.
- Video Conferencing is used in the field of telemedicine. Expert advice can be taken from the doctors in any part of the world by telling them the history of complicated medical cases by showing X-Rays, CT scans, etc.