National Instruments NI Vision PCI-1409, User Manual, Page: 32 / 40

Glossary
© National Instruments Corporation G-5 NI PXI/PCI-1409 User Manual
H
HSYNC Horizontal synchronization signal. The synchronization pulse signal
produced at the beginning of each video scan line that keeps a video
monitor’s horizontal scan rate in step with the transmission of each new
line.
hue Represents the dominant color of a pixel. The hue function is a continuous
function that covers all the possible colors generated using the R, G, and
B primaries.
See also RGB .
Hz Hertz. Frequency in units of 1/second.
I
IC Integrated circuit.
in. Inches.
INL Integral nonlinearity. A measure of LSB of the worst-case deviation from
the ideal A/D or D/A transfer characteristic of the analog I/O circuitry.
instrument driver A set of high-level software functions, such as NI-IMAQ, that control
specific plug-in computer boards. Instrument drivers are available in
several forms, ranging from a function callable from a programming
language to a virtual instrument (VI) in LabVIEW.
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.
interpreter A software utility that executes source code from a high-level language
such as Basic, C, or Pascal by reading one line at a time and executing the
specified operation.
interrupt A computer signal indicating that the CPU should suspend its current task
to service a designated activity.
interrupt level The relative priority at which a device can interrupt.
IRQ Interrupt request. See interrupt.