RGBLink VSP 729 - Manual (Page 19)

1. Introduction
Terms and Definitions
VSP 729 User Manual 19
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 light will
contaminate the light emitted from the CRT. Well-controlled viewing
conditions should yield a practical contrast ratio of 30:1 to 50:1.
 “DVI”: Digital Visual Interface. The digital video connectivity standard
that was developed by DDWG (Digital Display Work Group). This
connection standard offers two different connectors: one with 24 pins
that handles digital video signals only, and one with 29 pins that
handles both digital and analog video.
 “EDID”: Extended Display Identification Data – EDID is a data structure
used to communicate video display information, including native
resolution and vertical interval refresh rate requirements, to a source
device. The source device will then output the optimal video format for
the display based on the provided EDID data, ensuring proper video
image quality. This communication takes place over the DDC
– Display
Data Channel.
 “Ethernet”: A Local Area Network (LAN) standard officially known as
IEEE 802.3. Ethernet and other LAN technologies are used for
interconnecting computers, printers, workstations, terminals, servers,
etc. within the same building or campus. Ethernet operates over
twisted pair and over coaxial cable at speeds starting at 10Mbps. For
LAN interconnectivity, Ethernet is physical link and data link protocol
reflecting the two lowest layers of the OSI Reference Model.
 “Frame”: In interlaced video, a frame is one complete picture. A video
frame is made up of two fields, or two sets of interlaced lines. In a film,
a frame is one still picture of a series that makes up a motion picture.
 “Gamma”: The light output of a CRT is not linear with respect to the
voltage input. The difference between what you should have and what
is actually output is known as gamma.
 “HDMI” - High – Definition Multimedia Interface: An interface used
primarily in consumer electronics for the transmission of
uncompressed high definition video, up to 8 channels of audio, and
control signals, over a single cable. HDMI is the de facto standard for
HDTV displays, Blu-ray Disc players, and other HDTV electronics.
Introduced in 2003, the HDMI specification has gone through several
revisions.
 “HDSDI”: The high-definition version of SDI specified in SMPTE-292M.
This signal standard transmits audio and video with 10 bit depth and
4:2:2 color quantization over a single coaxial cable with a data rate of
1.485 Gbit/second. Multiple video resolutions exists including
progressive 1280x720 and interlaced 1920x1080 resolution. Up to 32
audio signals are carried in the ancillary data.
 “JPEG” (Joint photographic Expects Group): Commonly used
method of lossy compression for photographic images using a discreet
cosine transfer function. The degree of compression can be adjusted,
allowing a selectable tradeoff between storage size and image quality.
JPEG typically achieves 10:1 compression with little perceptible loss in
image quality. Produces blocking artifacts.
 “MPEG”: Motion Picture Expect Group. A standard committee under
the auspices of the International Standards Organization working on
algorithm standards that allow digital compression, storage and