select a letter for terms starting with that letter:
| B | C
| D | E
| F | G
| H | I
| J | K
| L | M
| N | O
| P | Q
| R | S
| T | U
| V | W
| X | Y
Acronym for Phase Alternate Line; the standard color
system used throughout Western Europe except in France.
PAL-M is the standard system in Brazil. It uses an interlaced
format with 25 frames per second and 625 lines per screen.
Acronym for Personal Computer. (Where have you been?)
Acronym for Personal Digital Assistant, such as a Palm™
or Windows® CE device.
The connectors used in computer/projector cables. Cables
are often identified by the number of pins they contain.
A typical computer video cable has 15 pins, and is called
a 15-pin video cable.
A modern term for turning something off. Applies most
commonly to electronics.
A speech given to one or more people utilizing some
sort of visual support.
Data transmission method that divides messages into
standard-sized packets for greater efficiency of routing
and transport through a network.
Phase Alternate Line; The standard color system used
throughout western Europe, except in France. The phase
of the color carrier is alternated from line to line.
It takes four full pictures for the color to horizontal
phase relationship to return to the reference point.
This alternation helps cancel out phase errors. For
this reason the hue control is not needed on a PAL
TV set. PAL, in many forms is used
in Australia, England, Scandinavia, South Africa, and
Western Europe. PAL uses 625-line,
50-field composite color transmission system. PAL-M
is the standard system in Brazil. It uses an interlaced
format with 25 frames per second and 625 lines per screen.
In digital video and computer graphics, the total number
of colors available for use in a presentation or program.
Brazilian version of PAL. Broadcast
standard with 525 lines and 60 fields per second.
To pivot a camera in a horizontal direction, tilt is
to pivot in the vertical direction.
A method of transmitting several bits of data simultaneously
through a communications channel.
Standard method of providing a passive matrix LCD
panel with drive signals, enables one horizontal row
of pixels along all of the vertical columns to be written
to at a time. See "Passive Matrix".
A computer graphics operation that transpires automatically
and without operator intervention.
A form of LCD driving approach that
relies on overlapping transparent conductive traces
to deliver the drive signal to the common vicinity (the
equivalent of pixels) outlined by two traces. The traces
are arranged as a network of vertical columns and horizontal
rows (a matrix) on opposing plates of glass so that
none of them touch across a thin gap of liquid crystal
material. See "Active Matrix".
Private Branch Exchange. A telephone switch usually
located on a customer's premises, connected to the telephone
network but operated by the customer. A PBX provides
pooled access to a given number of inside (extension)
lines in a smaller number of outside lines (trunks).
Often, outgoing calls are dialed directly; incoming
calls are handled by an operator or switched automatically
by the PBX software.
Acronym for Personal Computer.
Acronym for Printed Circuit Board.
Acronym for Personal Digital Assistant.
The highest or lowest level of signal strength, as determined
by the height of the signal's waveform.
An acquisition mode for digital oscilloscopes that lets
the user see the extremes of a signal.
Abbreviated "p-p". The Amplitude (voltage,
for example) difference between the most positive and
the most negative excursions (peaks) of a signal.
The whitest portion of a picture signal.
A means of compensating for mid and high frequency RGB
video bandwidth response in data monitors and projectors
and for signal losses due to cable capacitance. When
using the peak enhancements, use the following guidelines
for proper output settings: Use 50% with all computer
frequencies between 15-125 kHz at any cable length.
Use 100% with high frequency computers of 36 kHz or
higher with cable lengths 75 feet or greater.
peaking control compensates for mid and high frequency
RGB video bandwidth response in data
monitors and projectors and for signal losses due to
cable capacitance. By using the peaking control a noticeably
sharper picture will be seen on all displays regardless
of cable lengths, but, on lengths of 250 feet or more
with any signal ranging from 15-125 kHz, the peaking
control should probably be set at 100%.
Please note that 100% peaking may provide over enhancement
on short cable runs. Also called "sharpness"
Intel's "586" CPU chip competitive to RISC
A mid-range PC style computer from Apple
A device that a CPU communicates with, such as a printer,
mouse, external disk drive, interface, etc.
In essence, the "staying power" of a lighted
phosphor, since a phosphor begins to dim after being
excited by the electron beam. A long-persistence screen
allows the phosphor to dim more slowly.
A specifically defined goal that can be measured and
External devices controlled by the computer, e.g., keyboard,
printer, mouse, etc.
A microcomputer designed for use by an individual person
(or one at a time).
Professional Graphics Adapter, Resolution 640 x 400.
Professional graphics adapter. Early IBM analog graphics
adapter found in the PC AT series. The PGA was capable
of producing 256 colors.
The relative timing of one signal to another, usually
expressed in degrees of shift.
A 1/4" audio plug used as a speaker connector.
A plug most often used with line level audio signals.
Also known as an RCA plug.
The chemical coating on the inside of the CRT
screen that generates light (monochrome or color) when
struck by an electron beam. Each dot on the screen is
actually a phosphor that glows for a period of time.
The higher the quality/composition of the phosphor,
the brighter and more vivid the image. See persistence.
Same as level control.
The CRT used to produce and display
video images. The visible image is created by variations
in intensity of an electron beam which scans the phosphor-coated
interior surface of the tube.
The inward or outward (curved) appearance of the edges
of a display.
A list of control functions assigned to the pin numbers
on a remote control connector.
A uniform noise level over a given bandwidth, usually
in the video frequency range.
An illustration or table that names signals, voltages,
etc. that are on each pin of a connector or cable.
The microscopic physical indentation that "holds"
data in the information layer of a video-disc.
Acronym for picture element. The smallest element of
a raster display represented as a point with a specified
color and intensity. A definable location on a display
screen that consists of multiple or single triad of
dots (red, green, and blue.) A computer picture is typically
composed of a rectangular array of pixels (i.e. 300
by 450). The resolution of a picture is expressed by
the number of pixels in the display. For example, a
picture with 560 x 720 pixels is much sharper than a
picture with 275 x 400 pixels. The smallest image used
to create an image in computer graphics. Essentially,
an individual dot.
A measurement, in terms of discernible pixels, describing
the resolution or clarity of detail in an image. Applied
to computer graphics and video images.
Old Telephone Service
Conventional analog telephone lines using twisted-pair
copper wire. This is used to provide residential service.
(monitors or projectors)
Plasma Imaging: Plasma technology uses phosphor stripes
painted in Barrier Ribs (one stripe per color--red,
green and blue) and these ribs or stripes are charges
with a neo gas light mixture to create an image on a
flat surface (no screen required). More information
on Plasma technology may be found at www.plasmavision.com.
Cable having a covering that meets the UL specifications
for resistance to fire.
Acronym for Phase Locked Loop
An optical component that filters out light according
to its wave direction.
A projection screen that takes advantage of the differences
between the polarized projected light and randomly polarized
background light. By reflecting virtually all of the
vertically polarized light from the projector while
absorbing the random background light, especially the
horizontally polarized floor and table surface reflections,
the effective contrast ratio of a system can be greatly
enhanced. With such a screen, true "room light
visible" projection displays are quite feasible.
Small multicrystalline form of silicon used in silicon-gate
MOS technology that is electrically conductive and optically
Acronym for Plain Old Telephone Service.
Picture Line Up Generation Equipment - This is the name
of a test pattern that assists in properly setting picture
black level. PLUGE can be part of many test patterns.
The phrase and origination of the test signal are both
credited to the BBC.
The positive and negative orientation of a signal. Usually
refers to the direction or to a level with respect to
a reference. (e.g. positive sync polarity means that
sync occurs when the signal is going in the positive
A connector on a computer or peripheral that allows
it to be connected to something else. Typical ports
to be found on a computer include serial, parallel,
disk drive, video and external keyboard.
The state of production of a film or video program in
which editing or assembling from raw footage occur.
Apple's Macintosh version of a laptop PC.
The dissipation of heat by passing a current through
a resistance. Measured in Watts (W), it is expressed
by Ohm's law from the two variables: Voltage (E) and
Current (I). i.e. P = 1xR, or, P = E x I.
A microprocessor for the new generation of PC's and
workstations from IBM, apple and DEC. Is also the same
processor in the PowerMac PCs.
Pre-amplifier. An electronic circuit that raises a weak
signal high enough to be fed into an amplifier.
The first stage of production in which budgeting, flow-charting,
story-boarding, script writing, etc., occur. Included
are all design tasks which happen prior to actual production
of a film or video program/presentation.
A general term used to define a video projector or data
Colors, usually three, which are combined to produce
the full range of other colors within the limits of
a system. All non-primary colors are mixtures of two
or more of the primary colors. In television, the primary
colors are specific sets of red, green and blue.
Processing amplifier. An electronic device which stabilizes
or rebuilds signals.
The manipulation of data from one state to another.
See proc amp.
The stage when video, film, or software is actually
shot or created.
A set of instructions designed to make a device, or
a system, perform a specific function or functions.
Read Only Memory
A type of novolatile, semiconductor read-only memory
component that can be programmed by the user one time
and only read from that time on. A memory whose contents
is not lost when power is removed, but can be reprogrammed
using a special PROM programmer, or "burner".
Also see EPROM and EEPROM.
Another method of displaying images on the TV screen.
The beam of electrons emitted by a CRT scans the entire
screen every 1/30th of a second. (See non-interlaced).
The process of presenting visual media by light transmitted
through an optics system to a viewing screen.
Acronym for Programmable Read Only Memory.
Also known as "false color" or "colorized".
The colors projected do not correspond to the original
image. Products use a single, colorized LCD,
often with purple for dark shades and yellow for light
shades - purple background, yellow foreground. Thus,
what should be blue may turn out looking yellow, green
may look purple, etc.
Being free of patent or copyright. Public domain software
is available, free of charge, to anyone who wants to
A common waveform shape that has a fast rising edge,
a width, and a fast falling edge.