The core technology used in a video conferencing (VC) system is digital compression of audio and video streams in real time. The hardware or software that performs compression is called a codec (coder/decoder). Compression rates of up to 1:500 can be achieved. The resulting digital stream of 1's and 0's is subdivided into labelled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP). The use of audio modems in the transmission line allow for the use of POTS, or the plain telephony network in some low-speed applications, such as video telephony, because they convert the digital pulses to/from analog waves in the audio spectrum range.
The other components required for a VC system include:
- video input : video camera or webcam
- video output : computer monitor or television
- audio input : microphones
- audio output : usually loudspeakers associated with the display device or telephone
- data transfer : analog or digital telephone network, LAN or Internet
Basic kinds of VC systems and Standards.
Applications of Video Conferencing
Why ISDN Video Conferencing better than Internet based VC?
Life Size :
- LifeSize Products supports dozens of resolutions to ensure interoperability with standards based HD and SD endpoints
- Spatial Resolutions is >200 and whereas with other players it is only 9.
- Lifesize Products offer Virtual Multiway Layout that lets users select custom layouts of multiple images on one display
- Lifesize Products is 20% size of other players making it easier to deploy
- Datasharing and XGA(for Presentation sharing) pricing included in the Lifesize product price itself and other players offers it as optional features.
- LifeSize Products automatically adjust resolution as bandwidth decreases while maintaining frame rate for the best experience
- Pioneer in High Definition Video conferencing
- First High Definition Video conferencing and 1080p support
- Leader in HD video communications: delivered world’s first HD video products
- More than 15,000 unique customers in over 100 countries
- Founded in 2003 by industry veterans
- Product Excellence
- LifeSize is a division of Logitech a leader in PC video communication.
- Easy Installation with User friendly GUI
- In Multi conferencing also maintaining full HD 1080p resolution
- Range of product and can select based on the specific requirement
- First HD video conferencing which is officially Microsoft® qualified with Microsoft® Office
- Communications Server 2007 R2