3. General
3.3 Terms and definitions
3G
A 3 Gbit/s serial digital 10-bit or 12-bit video interface (SMP TE 424M and 425M).
Background (BCK)
Typically an unscaled source originating from a computer ’s multi-head graphics card, or a frame grab from a scaled source. E2
provides two background sources (BG A and BG B), each of w h ich appears at the system’s lowest priority — visually in back or
underneath all other sources.
Chroma Key
A type of key where the hole-cutting information is derived from a color rather than from a video level. A
n common ex ample on
television, is when the weatherman appears to be standing in front of a map. The map itself is a video signal, and the weatherman
is in fact standing in front of a green ( or blue) screen. On the sw itcher, t he Chroma Key process electronically s ubtracts the color
from the foreground image, and replaces it with video from the background ima ge to form a composi
te image.
Clip, Gain, Opacity
In sw itcher terminology, the p rocess of fine-tuning a key of any type (luminance, linear, or chroma). C lipping s ets the threshold for
the hole cutting circuitry, while "gain" defines the range an d sensitivity of adjustment. The "opacity" is the transparency or density of
the key, as revealed over a background.
Computer Video
A generic term indicating video that originates from a computer p latform. A progressive scan signal that follows VESA (Video Elec-
tronics Standards Association) standards, with typical resolutions of 800 x 600, 1024 x 768, 1280 x 1024, etc.
Crosspoint
The video switch (or button) that selects the input required on a particular switcher bus.
Cut
Cut is an instantaneous sw itch from one video source to another.
DA (Dis tribution Amplifier)
A v ideo device that inputs one video signal, and outputs multiple “identical” signals.
Destination (DST)
Destination is a location to which you can route the output of an E2. A destination can be configured as :
• A single screen (one projector)
• Multiple screens (such as a wide screen application)
• An external processor (such as a ImagePRO-II)
DSK (Downstream Keyer)
A DSK is a key that is electronically located after all other switcher functions — visually on top of all other layers and buses.
Fader
See T-Bar.
GUI (Graphical User Interface)
A term that describes a status display based on graphics a
nd icons, rather than strictly on numbers and letters.
HD-SDI (High Definition Serial Digital Interfa
ce)
HD-SDI signal is a high definition SDI signal (SMPTE 292M). Example formats are 720p, 1080i, and 1080p.
Key
An electronic (and visual) process whereby one image is electronically s uperimposed over another source or background. Keys are
typically us ed for titles, logos, and banners.
Keyframe
In a PIP “move,” a keyframe is a point where an action or change occurs. For example, when a PIP moves from the upper right
corner to full sc reen, key frame 1 is the upper right pos ition, and keyframe 2 is the full screen position of the PIP.
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