Glossary

  CBR is a technique for encoding voice and video which forces the output bitstream to stay within a specific bitrate constraint in a short timeframe, which is usually set to a single second. This reduces the flexibility of the encoding process to invest more bits in complex segments. CBR ...

Common Intermediate Format: 352 × 288 pixelsA standard video format used in video conferencing. Also known as "SD" (Standard Definition).

Codecs are used to convert sound, speech or video signals from analog to digital code, and vice versa.They can be hardware based or software based and they vary in their performance and media quality they generate.Codecs are split into encoders, which encode analog data into a digital format, and to ...

Color sampling, or Chroma sub-sampling, is the practice of encoding images by reducing the input resolution for the chroma information. It is used in many video encoding schemes — both analog and digital.Since the human visual system is much more sensitive to variations in brightness (knows as Luma component) than ...

A color space describes the range of colors, or gamut, that a certain device or standard can support. For instance, the range a camera can capture, a monitor can display or a standard can encode.A color space covers a subset of the entire color spectrum. Some color spaces contain more ...

RADVISION's operaing system abstraction layer.The Common Core is a set of modules that provide a single set of API calls internally to RADVISION's developer solutions. This makes porting of developer solutions easier, as the only layer that needs to be ported is the Common Core itself.The Common Core supports a ...

Continuous Presence (or CP for short) is a method used in video conferencing whichbasically means that all participants, or a subset of these participants, including the active speaker, are seen on the screen at the same time.CP involves a lot of graphical manipulations on the streams received by the different ...

see Continuous Presence.

CPE devices are devices that service providers place at a customer's home or office, providing access to the service provider's services.In the scope of telephony and VoIP, CPE devices can be Residential Gateways, ATAs, IADs or EMTAs.

CRC is a simple and fast error detection code, based on a polynomial long division operation. In real life, CRC is calculated for a block of bytes you wish to protect. When the time comes to check the validity of the bytes for errors, you recalculate the CRC for the ...