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Glossary
©
National Instruments Corporation
G-11
PCI/PXI-1408 and NI-IMAQ for Win95/NT
PLL
phase-locked loop—circuitry that provides a very stable pixel
clock that is referenced to another signal, for example, an
incoming HSYNC signal
protocol
the exact sequence of bits, characters, and control codes used to
transfer data between computers and peripherals through a
communications channel
pts
points
PXI
PCI eXtensions for Instrumentation. PXI is an open specification
that builds off the CompactPCI specification by adding
instrumentation-specific features.
R
RAM
random-access memory
real time
a property of an event or system in which data is processed as it is
acquired instead of being accumulated and processed at a later
time
region-of-interest
a hardware-programmable rectangular portion of the acquisition
window
relative accuracy
a measure in LSB of the accuracy of an ADC; it includes all
nonlinearity and quantization errors but does not include offset
and gain errors of the circuitry feeding the ADC
resolution
the smallest signal increment that can be detected by a
measurement system; resolution can be expressed in bits, in
proportions, or in percent of full scale. For example, a system has
12-bit resolution, one part in 4,096 resolution, and 0.0244 percent
of full scale.
RGB
red, green, and blue—the three primary colors used to represent a
color picture. An RGB camera is a camera that deliver three
signals, one for each primary.
ribbon cable
a flat cable in which the conductors are side by side
ROI
region-of-interest; a hardware-programmable rectangular portion
of the acquisition window