Matrox 4Sight User Manual page 198

198 Appendix E: Glossary
Local Area Network (LAN)
A group (or network) of computers and other devices that are
connected together to share the resources (files, printers,
devices, and other services (such as Internet access)) of a
single workstation or server within a small geographical
area. The main LAN connection technology used is Ethernet
cable, which connects users (clients) to the LAN's server.
Clients download applications and/or services from the
server, and then run or use them from their local computer.
LUT mapping
Look-up table mapping. A point-to-point operation that uses
a table to define a replacement value for each possible pixel
value in an image.
MSPS
Mega samples per second.
PCI
Peripheral Component Interconnect. An expansion bus
standard for the '90s.
PLC
Programmable Logic Controller. A device used to automate
monitoring and control of industrial plants. It can be used as
a stand-alone device or in conjunction with data acquisition.
PLL
Phase-locked loop. A technique in electronic circuitry for
maintaining synchronization. The circuit receives its timing
from input signals, but also provides a feedback circuit for
synchronization. The resulting output signal varies
according to differences between the reference signal and the
feedback signal. In particular, a frame grabber's PLL creates
a pixel clock, which is a multiple of a referenced signal's
frequency. In this context, the referenced signal is usually the
horizontal sync. A PLL adjusts the pixel clock frequency
according to changes or variations in its reference signal.
Adjusting the pixel clock frequency ensures that the same
number of pixels appears on every line.