1.
Brief Introduction
Terms and Definitions
VSP 168HD User Manual 19
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 exist including
progressive 1280x720 and interlaced 1920x1080 resolutions. Up to 32
audio signals are carried in the ancillary data.
“JPEG” (Joint photographic Expects Group):
Commonly used
method of loss 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.
