Glossary
G-12
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trigger
Any event that causes or starts some form of data capture.
trigger control and
mapping circuitry
Circuitry that routes, monitors, and drives external and RTSI bus trigger
lines. You can configure each of these lines to start or stop acquisition on a
rising or falling edge.
TTL
Transistor-transistor logic.
U
UV plane
See YUV.
V
V
Volts.
VCO
Voltage-controlled oscillator. An oscillator that changes frequency
depending on a control signal; used in a PLL to generate a stable pixel
clock.
VI
Virtual Instrument. (1) A combination of hardware and/or software
elements, typically used with a PC, that has the functionality of a classic
stand-alone instrument (2) A LabVIEW software module (VI), which
consists of a front panel user interface and a block diagram program.
video line
A video line consists of an HSYNC, back porch, active pixel region, and a
front porch.
VSYNC
Vertical synchronization signal. The synchronization pulse generated at the
beginning of each video field that tells the video monitor when to start a
new field.
VSYNCIN
Vertical sync in signal.
W
white reference level
The level that defines what is white for a particular video system. See also
black reference level.
