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Dictionary of Technical Terms - V
V
Vertical. See vertical interval. One of the two color difference signals that modulate subcarrier in the PAL system. V corresponds to weighted R-Y, and U corresponds to weighted B-Y. The V component of subcarrier is reversed in phase on alternate lines. The formula for the V signal is .877 (R-Y). A signal that identifies the first field of the four field color sequence for NTSC or the eight field color sequence for PAL (see color field). Also called CFID (color field ID). Volt-ampere. Volts times amperes. Value-added network. PAL color difference signals. In PAL television, a 180 degrees phase shift at line rate of the V color component relative to subcarrier. See also PAL ID. Refers to the width in terms of time or horizontal lines of the television blanking signals that occur during the vertical retrace interval. Video cassette recorder. Voltage controlled crystal oscillator. A trademarked name that has become the generic description for a vector display unit which allows visual checking of the phase and amplitude of the color components of a video signal.
videoDesigner Desktop Graphics
A Grass Valley graphics system designed for the MS-DOS PC.video distribution amplifier (DA)
See distribution amplifier. A video signal from a primary input or external input used to fill the hole made by a key signal.video gain (white level, white bar, reference white)
The range of light-to-dark values of the image which are proportional to the voltage difference between the black and white voltage levels of the video signal. Expressed on the waveform monitor by the voltage level of the whitest whites in the active picture signal. Video gain is related to the contrast of the video image. European term for video production switcher. A high-quality television set (without RF circuits) that accepts video baseband inputs directly from a TV camera, videotape recorder, etc. The electronic path within the device that routes and processes the video signals. Video path length refers to the amount of time required for a signal to travel from input to output. A device that stabilizes the composite video signal, regenerates the synchronizing signals, and allows other adjustments to the video signal parameters. An electrical signal that includes all of the information present in the television picture together with the necessary synchronizing signals.video switcher (production switcher, video mixer)
Device that accepts inputs from a variety of video sources and allows the operator to select a particular source to be sent to the switcher's output(s). May also include circuits for video mixing, wiping, keying, and other special effects.videotape recorder (video tape recorder, VTR)
A device which permits audio and video signals to be recorded on magnetic tape. A measurement, typically in dB, of the amount of unwanted video signal energy present in an audio signal. The track or area on a videotape where video information is recorded. In desktop video editing, a window that allows playing of video clips, albums, and timelines. Vertical interval reference. Reference signal inserted into the vertical interval of source video. This signal is used further down the video chain to verify parameters and to automatically adjust gains and phase. Division of a single physical routing matrix into several smaller routing matrices. European term for video production switcher. Vertical interval time code. Time code encoded into the vertical interval of the video. It usually can be read out even when a VTR is still-framed or running at slower or faster than play speed.VITS (vertical interval test signal)
A signal that may be included during the vertical blanking interval to permit on-the-air testing of video circuit functions and adjustments. Voice messaging services. A circuit used for controlling and maintaining a voltage at a constant level. Virtual Private Network. Video status display. Videotape recorder. Volume-unit meter, a type of meter used to indicate average audio amplitude.We've recently redesigned our website so your bookmarked links may no longer work. Please use either the search bar at the top right of this page or select an area from one of the tabs above to find what you are looking for.
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