| Video Conferencing in its most basic
form is the transmission of image (video) and speech (audio)
back and forth between two or more physically separate locations.
This is accomplished through the use of cameras (to capture
and send video from your local endpoint), video displays (to
display video received from remote endpoints), microphones (to
capture and send audio from your local endpoint), and speakers
(to play audio received from remote endpoints). |
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1. Full Screen
Monitor
2. PTZ Camera
3. Micro Phone
4. Speaker
5. VC Encoder (H.323 standard)
6. Multipoint Control Unit (MCU)
7. Gateway
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Video communication systems
were originally based on the H.320 standard defining Integrated
Switched Digital Network (ISDN) connection - based video communication.
As time went by, technology changed and H.323 standard for packet-based
multimedia communications replaced a Transmission Control Protocol
/ Internet Protocol introduced by ITU.
The H.323 standard is a logical extension of the H.320 standard
to enable corporate intranets and packet-switched networks to
transport multimedia and video communication traffic.
- Mux (H.245) : Specifies messages for call
control including Signaling, registration & admissions
and packetization / synchronization of media streams
- Control (H.245) : Specified messages for
opening and closing channels for media streams, and other
commands, requests and indications.
- Video (H.261) : Video coding / decoding methods
for the moving picture component of AV services at the rate
of n x 64 kbits, n = 1 tp 30
(H.263) : A newer Video Codec that added additional picture
formats over H.261 (4CIF and 16 CIF)
- Audio (G.723) : G.723: Audio Codec,
for 5.3 and 6.3 Kbps Modes
(G.711) : Audio Codec, 3 KHz at 48, 56 and 64 Kbps (Normal
telephony)
(G.722) : Audio Codec, 7 KHz at 48, 56, and 64 Kbps
(G.728) : Audio Codec, 3 KHz at 16 Kbps
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Is used for
a variety of purposes, which include:
Personal communication : Informal communication
normally uses desktop system. More formal meetings with several
participants at each site probably use dedicated studio settings.
Collaborative work between researchers use shared applications.
Presentations
Education : Teaching usually involves one to many connections.
The student sites may receive audio and video but only send
audio.
 Benefits
of Video Conferencing
Video Conferencing becomes very essential when
there is a clear communication need, and the benefits described
by those using video conferencing systems include:
»Reduced travel
costs
»Face to face rather than
telephonic meetings
»Better quality teaching
»Easier collaborative working
MCBS offers Video Conferencing systems for
all applications based on state-of-the-art technology &
equipments.
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