REV. 0

–8–

ADV7125

TERMINOLOGY

Blanking Level

The level separating the

SYNC 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 will shut off the picture

tube, resulting in the blackest possible picture.

Color Video (RGB)

This usually 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 Signal (

SYNC)

The position of the composite video signal that synchronizes the

scanning process.

Grayscale

The discrete levels of video signal between reference black and

reference white levels. An 8-bit DAC contains 256 different levels.

Raster Scan

The most basic method of sweeping a CRT one line at a time to

generate and display images.

Reference Black Level

The maximum negative polarity amplitude of the video signal.

Reference White Level

The maximum positive polarity amplitude of the video signal.

Sync Level

The peak level of the

SYNC signal.

Video Signal

The portion of the composite video signal that varies in grayscale

levels between reference white and reference black. Also referred

to as the picture signal, this is the portion that may be visually

observed.