ADV7123
TERMINOLOGY
Raster Scan
Blanking Level
The most basic method of sweeping a CRT one line at a time to
generate and display images.
SYNC
The level separating the
portion from the video portion
of the waveform. Usually referred to as the front porch or back
porch. At 0 IRE units, it is the level that shuts off the picture
tube, resulting in the blackest possible picture.
Reference Black Level
The maximum negative polarity amplitude of the video signal.
Reference White Level
Color Video (RGB)
The maximum positive polarity amplitude of the video signal.
This refers to the technique of combining the three primary
colors of red, green, and blue to produce color pictures within
the usual spectrum. In RGB monitors, three DACs are required,
one for each color.
Sync Level
SYNC
The peak level of the
signal.
Video Signal
SYNC
Sync Signal (
)
The portion of the composite video signal that varies in gray
scale levels between reference white and reference black. Also
referred to as the picture signal, this is the portion that can be
visually observed.
The position of the composite video signal that synchronizes
the scanning process.
Gray Scale
The discrete levels of video signal between reference black and
reference white levels. A 10-bit DAC contains 1024 different
levels, while an 8-bit DAC contains 256.
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