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Chapter 3 - Video Concepts
Video Concepts
CHAPTER
3
VGA & TV Compared
Most video systems use AV composite signal or S-Video Signal to carry image
data. The standard in the U.S. is NTSC but other versions such as PAL and SECAM
are popular in other parts of the World. NTSC uses 525 scan lines. PAL uses 625
scan lines and is popular in European and Asian countries. TV Super Scan 2
Enhanced is only available in NTSC version.
The Difference between VGA & TV Signals
VGA, the primary display device supported by PC'S is by far the best display
media on the low-end PC graphics market. It possesses gray level capabilities and
circuits for displaying real-world images instead of artificial computer graphics.
The standard VGA is compatible with CGA, EGA and can be operated in 320 x 200
resolution, 256 colors/64 gray scale and 640 x 480 resolution, 256 colors.
Super VGA is a resolution of 640 x 480 or higher with more than 16 colors.
NTSC: (National Television Standard Committee); The organization that specified
the television standard used in North America and several other countries. 525
lines, 60 frames per second, 2 frames per field.
PAL: (Phase Alternating Lines); The television standard used in most of Europe.
PAL uses 625 lines and 50 frames per second.
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