44 Glossary
Refresh Rate:
Number of times per second a display is updated or “repainted”. NTSC signals have a refresh rate of
30 times per second; PAL signals have a refresh rate of 25 times per second. LED displays should be refreshed at least
120 times per second.
RGB (Red-Green-Blue):
Colors of LEDs used in full-color Daktronics displays. All colors are defined in terms of a
combination of these three colors. For example, the RGB abbreviation for he color blue is 0-0-255.
SDI (Serial Digital Interface):
A digital video interface used with broadcast-grade video.
S-Video (Super-Video, Y/C Video):
A technology for transmitting video signals over a cable by dividing the
video information into two separate signals: one for color (chrominance), and the other for brightness (luminance).
When sent to a television, S-Video produces sharper images than composite video, where the video information is
transmitted as a single signal over one wire; this is because televisions are designed to display separate Luminance
(Y) and Chrominance (C) signals.
SXGA (Super eXtended Graphics Array):
A standard monitor resolution of 1280 x 1024 pixels.
Tera Term Program:
A computer program that obtains diagnostic information through a COM port. The Tera Term
program allows users to see the communication between the computer and the VIP-4400.
True Pixel
™
Processing:
Video processing technology that improves image clarity and color.
VGA (Video Graphics Array):
A graphics display system for PCs developed by IBM. VGA uses analog signals rather
than digital signals. VGA computer monitors have a resolution of at least 640 x 480 pixels.
Viewable Area (VA):
The video area a sign displays. This is the portion of the incoming video that the Channel uses
for output. The VA is smaller than the total video signal area because a black (or blank) border of about 50 to 100 extra
pixels is built into the signal.
Video Image Processor (VIP):
Device primarily intended to accept and process live video and/or computer graphics
feeds before sending them to a display.
V-Max
™
4 signal:
The proprietary signal used with Daktronics displays.
