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Glossary
PCI/PXI-1408 and NI-IMAQ for Win95/NT
G-6
©
National Instruments Corporation
frame
a complete image; in interlaced formats, a frame is composed of
two fields
front porch
the area of a video signal between the start of the horizontal blank
and the start of the horizontal sync
ft
feet
function
a set of software instructions executed by a single line of code that
may have input and/or output parameters and returns a value when
executed; examples of functions are:
y = COS (x)
status =
AO_config
(board, channel, range)
G
gamma
the nonlinear change in the difference between the video signal’s
brightness level and the voltage level needed to produce that
brightness
genlock
circuitry that aligns the video timing signals by locking together
the horizontal, vertical, and color subcarrier frequencies and
phases and generates a pixel clock to clock pixel data into
memory for display or into another circuit for processing
GND
ground signal
GUI
graphical user interface—an intuitive, easy-to-use means of
communicating information to and from a computer program by
means of graphical screen displays; GUIs can resemble the front
panels of instruments or other objects associated with a computer
program.
H
h
hour
hardware
the physical components of a computer system, such as the circuit
boards, plug-in boards, chassis, enclosures, peripherals, cables,
and so on