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Glossary
NI PCI-1405 User Manual G-4 ni.com
interlaced A video frame composed of two interleaved fields. The number of lines in
a field are half the number of lines in an interlaced frame.
interrupt A computer signal indicating that the CPU should suspend its current task
to service a designated activity.
L
luma The brightness information in the video picture. The luma signal amplitude
varies in proportion to the brightness of the video signal and corresponds
exactly to the monochrome picture.
M
MTBF Mean time between failure.
N
NI-IMAQ Driver software for National Instruments hardware.
NTSC National Television Standards Committee. The committee that developed
the color video standard used primarily in North America, which uses
525 lines per frame. See also PAL.
NVRAM Nonvolatile RAM. RAM that is not erased when a device loses power or is
turned off.
P
PAL Phase Alternation Line. One of the European video color standards; uses
625 lines per frame. See also NTSC.
PCI Peripheral Component Interconnect. A high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. PCI
offers a theoretical maximum transfer rate of 132 Mbytes/s.
pixel Picture element. The smallest division that makes up the video scan line;
for display on a computer monitor, a pixel’s optimum dimension is square
(aspect ratio of 1:1, or the width equal to the height).