National Instruments PCI-1411 User Manual
Page 43
Glossary
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P
PAL
Phase Alternation Line. One of the European video color standards; uses
625 lines per frame. See also NTSC.
PCI
Peripheral Component Interconnect. A high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. PCI
offers a theoretical maximum transfer rate of 132 Mbytes/s.
pixel
Picture element. The smallest division that makes up the video scan line;
for display on a computer monitor, a pixel’s optimum dimension is square
(aspect ratio of 1:1, or the width equal to the height).
pixel clock
Divides the incoming horizontal video line into pixels.
pixel count
The total number of pixels between two horizontal synchronization signals.
The pixel count determines the frequency of the pixel clock.
PLL
Phase-locked loop. Circuitry that provides a very stable pixel clock that is
referenced to another signal, for example, an incoming horizontal
synchronization 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.
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.
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.