Terms & Definitions - RGBlink DXP H1010 User Manual

6.2 Terms & Definitions
The following terms and definitions are used throughout this guide.
 "ASCII": American Standard for Information Interchange. The standard code consisting of 7-bit coded
characters (8 bits including parity check) used to exchange information between data processing systems,
data communication systems, and associated equipment. The ASCII set contains control characters and
graphic characters.
 "Aspect ratio": The relationship of the horizontal dimension to the vertical dimension of an image. In
viewing screens, standard TV is 4:3, or 1.33:1; HDTV is 16:9, or 1.78:1. Sometimes the ":1" is implicit, making
TV = 1.33 and HDTV = 1.78.
 "AV": Audio visual, or audio video.
A "Background" is an unscaled source, typically originating from a computer. A background source appears
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at the system's lowest priority — visually in back of all other sources.
"Baudrate": Named of J.M.E. Baudot, the inventor of the Baudot telegraph code. The number of the
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electrical oscillations per second, called baud rate. Related to, but not the same as, transfer rate in bits per
second (bps).
 "Blackburst": The video waveform without the video elements. It includes the vertical sync, horizontal sync,
and the chroma burst information. Blackburst is used to synchronize video equipment to align the video
output. One signal is normally used to set up an entire video system or facility. Sometimes it is called House
sync.
 "BNC": Bayonet Neill-Concelman. A cable connector used extensively in television and named for its
inventors. A cylindrical bayonet connector that operates with a twist-locking motion. To make the
connection, align the two curved grooves in the collar of the male connector with the two projections on
the outside of the female collar, push, and twist. This allows the connector to lock into place without tools.
 "Brightness": Usually refers to the amount or intensity of video light produced on a screen without regard
to color. Sometimes called "black level.
 "CAT 5": Category 5. Describes the network cabling standard that consists of four unshielded twisted pairs of
copper wire terminated by RJ-45 connectors. CAT 5 cabling supports data rates up to 100 Mbps. CAT 5 is
based on the EIA/TIA 568 Commercial Building Telecommunications Wiring Standard.
 "Color bars": A standard test pattern of several basic colors (white, yellow, cyan, green, magenta, red, blue,
and black) as a reference for system alignment and testing. In NTSC video, the most commonly used color
bars are the SMPTE standard color bars. In PAL video, the most commonly used color bars are eight full
field bars. In the computer, the most commonly used color bars are two rows of reversed color bars.
 "Color burst": In color TV systems, a burst of subcarrier frequency located on the back porch of the
composite video signal. This serves as a color synchronizing signal to establish a frequency and phase
reference for the chroma signal. Color burst is 3.58 MHz for NTSC and 4.43 MHz for PAL.
 "Color temperature": The color quality, expressed in degrees Kelvin(K), of a light source. The higher the
color temperature, the bluer the light. The lower the temperature, the redder the light. Benchmark color
temperature for the A/V industry include 5000°K, 6500°K, and 9000°K.
 "Contrast ratio": The radio of the high light output level divided by the low light output level. In theory, the
contrast radio of the television system should be at least 100:1, if not 300:1. In reality, there are several
limitations. In the CRT, light from adjacent elements contaminate the area of each element. Room ambient
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