V
Varispeed
Increasing or decreasing tape speed to match the musical pitch of tape playback.
Varnish:
A clear liquid applied to printed surfaces for looks and protection. (UV coating looks better.)
Vectorscope
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.
Verso:
The left hand page of an open book.
Vertical interval
The portion of the video signal that occurs between the end of one field and the beginning of the next. During this time, the electron beams in the cameras and monitors are turned off (invisible) so that they can return from the bottom of the screen to the top to begin another scan.
Vertical sync pulse
The synchronizing pulse at the end of each field which signals the start of vertical retrace.
Video
An electrical signal that carries television picture information.
Video Assist
The process of simultaneously recording filmed picture onto video tape by means of the same lens system in order to immediately evaluate a take as soon as it is completed. (Production)
Video CD
A consumer format for storing video presentations on CD discs. VCD can fit 74 minutes of "VHS-quality" video on a CD, but at lower video resolution than DVD using the older MPEG-1 compression format. The VCD format is especially popular in Asia as format for distributing commercial movies and videos. Many DVD authoring tools provide the option to author to VCD format, and most DVD players can play the format. This provides an inexpensive option for sharing productions with most computers. Many set-top DVD players also can play VCDs. See also DAT, DVD on CD, SVCD.
Video crosspoint module
In video switchers, a circuit board containing video switching crosspoints.
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.
Video Manager
The DVD Video data element that contains the global information and directory for the disc, including domains for multiple languages and regional and parental control settings. The VMG also typically contains the main title menu for navigating the entire disc, any introductory video clips, such as copyright notices. See also Video Title Set (VTS).
Video mixer
European term for video production switcher.
Video monitor
A high-quality television set (without RF circuits) that accepts video baseband inputs directly from a TV camera, videotape recorder, etc.
Video Object (VOB)
A MPEG video program stream with multiplexed video, audio, subpictures, and control information. See also DVD Volume.
Video path
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.
Video processing amplifier
A device that stabilizes the composite video signal, regenerates the synchronizing signals, and allows other adjustments to the video signal parameters.
Video signal
An electrical signal that includes all of the information present in the television picture together with the necessary synchronizing signals.
Video Stream
Each DVD-Video track is based on a main video stream, which can be motion video, a still image, or a series of stills. The track also can contain additional alternate video streams. The DVD-Video format supports one main video track and up to eight alternate video streams. See also audio stream, MultiAngle video, track.
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.
Video Title Set (VTS)
Video Title Set (VTS) -- The DVD-Video data element that contains a group of program material that shares the same menu hierarchy and basic data formats. Professional tools support multiple VTSs in order to organize the contents of a DVD into logical groups, and to include different kinds of material and formats on a single disc. See also title, Video Manager (VMG).
Video to audio crosstalk
A measurement, typically in dB, of the amount of unwanted video signal energy present in an audio signal.
Video_TS
The root directory of a DVD-Video production as stored on a DVD disc. See also AUDIO_TS, DVD Volume.
Videotape recorder (video tape recorder, VTR)
A device which permits audio and video signals to be recorded on magnetic tape.
Vignette halftone:
A halftone whose background gradually fades to white.
VIR
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.
Virtual Surround Sound
Audio processing that creates a simulated surround-sound effect by converting a surround-sound signal into a stereo signal, either for playback on two speakers or especially for playback with stereo headphones. See also Dolby Digital, Dolby Headphone, surround sound.
Vision mixer
European term for video production switcher.
VITC
Vertical Interval Time Code. A time code signal that is written in the vertical interval by the rotating video heads, allowing it to be read when the tape is not moving. Requires special equipment to read and write.
VOB File
Video Object file in the DVD-Video disc format. See also DVD Volume.
Voice-over
Narration or non-synchronous dialog taking place over the action onscreen.
Voltage regulator
A circuit used for controlling and maintaining a voltage at a constant level.
VTS File
Video Title Set files used to store the video contents (VOB files) and navigational information (IFO files) for each title in the DVD-Video disc format. See also DVD Volume.
VU Meter
A meter designed to measure audio level in volume units which generally correspond to perceived loudness. (Audio)
VU meter
Volume-unit meter, a type of meter used to indicate average audio amplitude.
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