1. Brief Introduction
Terms and Definitions
BMV-4 User Manual 16
computer, the most commonly used color bars are two rows of
reversed color bars.
“Color burst”:
In color TV systems, a burst of sub-carrier 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 chrome 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 includes 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
