Glossary

see Voice Activity Detection.

see Voice Activated Switching.

  VBR is a technique of encoding voice and video which allows the output bitstream to vary in the amount of bits per a given amount of time. This allows higher bitrates to be allocated to segments in the bitstream that are more complex than others. VBR is usually used ...

VCC is a technology for persistent calls handovers between different types of access networks. It has been adopted by the 3GPP to allow handing over mobile voice calls from circuit switched networks to packet switched ones. IMS is used for VCC implementations for the packet switched network side.

See Video Fast Update.

The big challenge in most video applications is to provide the highest video quality with a minimum cost of bit rate. As a result of lossy compression techniques, non optimized network conditions and other application restrictions, video quality is affected and quality of service may reduce. Video artifacts may be ...

Software or hardware device that enables video decompression. In general, a video decoder is used to reconstruct the video content from compressed data into a visible displayed format. For real time streaming network applications, the decoder is used to convert video packets sent over the network into video frames which ...

Software or hardware device that enables video compression. Generally, compression is used to reduce the size of the visual content, either for storage purposes or for streaming over a network channel (reduce bit rate). Video encoder performance and quality is being determined by the encoder complexitySee also: Video Decoder

Video Fast Update (VFU) is a mechanism in which a receiver requests a "refresh" from the sender, in case the video received is suspected to be corrupted (for instance, in case of a packet loss).In case of a VFU request, the sender will send a new Intra Frame, to serve ...

Voice Activated Switching (or VAS for short) is a term used in video conferencing to describe a method where the active speaker, the term for the meeting participant that is now talking, will be seen by all meeting participants whenever she (or he) is talking.

Voice activity detection (or VAD for short) is a technique used to determine thepresence or absence of human speech in an audio sample. The main uses of VAD is in speech coding and telecommunications, where it can facilitate speech processing as we;; as be used to deactivate some processes during ...

VoLTE is a GSMA specification also known as GSMA PRD IR.92.VoLTE started as an initiative by a group of companies known as One Voice.VoLTE focuses on specifying how voice, SMS and rudimentary supplementary services are signaled over LTE. The signaling selected by LTE is IMS.The test specificaiton document and interoperability ...

A telecommunication service that allows deaf, hard of hearing and speech-impaired individuals to communicate with hearing and speaking people in real-time using a sign language interpreter. The concept of VRS was envisioned by Ed Bosson from the Texas Public Utility Commission more than 16 years ago. Bosson contacted Sprint Relay ...