Home : Glossary : V
Vacuum Tube: A multi-electrode valve which controls the flow of electrons in a vacuum from electrode to electrode.
VCR: Video Cassette Recorder. See also: VTR
Vector Image: A graphics image which exists as a series of geometric shapes, rather than as a series of values for each pixel. Has the advantage of being resizable without loss of quality.
Vectorscope: A device which graphically displays information about the chroma (colour) part of a vision signal. Used in conjunction with a waveform monitor (in fact, many devices are switchable between waveform and vectorscope modes). Related info: Calibrating video sources
VHF: Very High Frequency. This is a popular television broadcast band. It is lower than UHF (Ultra-High Frequency), and generally has a higher broadcast range.
VHS: Vertical Helical Scan. In the late1970s, VHS became known as Video Home System. VHS won the format war against Betamax, despite being technically inferior. More info: The VHS Format, The VHS vs Beta War, VHS-C
Video: There are many definitions of video, most of them rather loose. It essentially means any medium which displays moving images electronically (as opposed to mechanical film).
Video8: An analogue video format introduced by Sony in the 1980s. The first compact cassette format for camcorders. More info: Video8
Video Level: The strength of a video signal. Level is measured in volts/millivolts - the standard broadcast vision level is 1V peak-to-peak, of which 700mV comprises the picture information and 300mV comprises the timing and sync information. Related info: Calibrating video sources
Viewfinder: A component of video, television and film cameras. Available as EVF (Electronic Viewfinder) or OVF (Optical Viewfinder). An EVF has a small CRT which displays the camera output (or tape output). More info: Video camera viewfinder
Vision: The picture component of a video, television or film program (as opposed to the audio component).
Vision Control Operator: The person responsible for maintaining the technical quality of the vision signal(s). This may involve controlling some camera's functions remotely (such as iris, colour balance, etc.), as well as making adjustments to any vision source's technical characteristics (such as video level, timing, etc.). More info: Vision control (CCU)
Vision Mixer (1): A device which accepts multiple vision source inputs, manipulates them, and provides one or more vision outputs in real time.
Vision Mixer (2): A person who operates a vision mixer as described above. AKA vision switcher. More info: Vision switcher
VITC: (Pronounced "vitsee") Vertical Interval Time Code. A type of timecode used in some video tape formats.
Vocal: Of the human voice.
Volt: Unit of electromotive force. 1 volt, when applied to a 1 ohm conductor, produces a current of 1 ampere.
Voltage: Electromotive force, in volts.
Voltmeter: A device which measures voltage. One of the functions of a multimeter.
VOX (1): Voice operated switch.
VOX (2): Abbreviation for vocals.
Vox Pop: From the latin phrase vox populi, meaning "voice of the people". The vox pop is a technique used in many forms of media, to provide a "snapshot" of public opinion. Random subjects are asked to give their opinion on a particular topic, and these are presented to the viewer/reader as a reflection of popular opinion More info: Vox pops for video and television
VT: Video Tape. A magnetic storage medium for video. Related info: VT Operations
VTR: Video Tape Recorder. See also: VCR.
VU: Volume Unit, a unit to measure the volume of an audio signal. More info: VU Meters