Best DVD Copy Software Review
Gossary
NTSC
National Television Standards Committee. United States' standard for scanning
television signals that has been adopted by numerous other countries.
Frames are displayed at 30 frames per second. (Other standards: PAL (Europe)
and SECAM (France/former USSR))
NTSC-4.43
A variation of NTSC where a 525/59.94 signal is encoded using the PAL
subcarrier frequency and chroma modulation. Also called 60-Hz PAL.
numerical aperture (NA)
A unitless measure of the ability of a lens to gather and focus light.
NA = n sin q, where q is the angle of the light as it narrows to the focal
point. A numerical aperture of 1 implies no change in parallel light beams.
The higher the number, the greater the focusing power and the smaller
the spot.
Recommended
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