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Overhead
Projector
In ancient history, overhead projectors were used to
give presentations. They involved static pages of see-through
"paper" on which black images were printed. Historians
suggest ancient presenters even used marking pens to
write on these transparent pages.
Object-Oriented
Programming (OOP)
A method of programming in which every element in a
program is self-contained, having within itself all
the data and instructions that operate on that data
and that are appropriate for that object. One element
transmits a message to another, and the recipient of
that message carries out the instruction. OOP is generally
more flexible or adaptable than standard programming.
OCR
Acronym for Optical Character Reader or Optical Character
Recognition.
OHM
The electrical unit of resistance, transmitting a current
of 1 amp when subjected to a potential difference of
1 volt. Represented by Z or "horseshoe shape".
Optical
Character Reader or Optical Character Recognition
A device or method that reads characters as images and
converts them into text to be used in a computer. This
can also be done through software.
Optical
Memory
A generic term used to describe technology that deals
with information storage devices that use light usually
in the form of a laser, to record, read, and decode
data.
Optical
Read-Only Memory (OROM)
A 5.25-inch laser-encoded optical memory storage medium,
used primarily to store digital data, as opposed to
video data, which features a concentric circular format
and constant angular velocity (CAV). OROMs have a faster
access time than that of a CD-ROM disk, but with about
half the storage space (250 megabytes for an OROM disc
compared to 500 megabytes for CD-ROM disc).
Oscilloscope
A test device that allows measurement of electronic
signals by displaying the waveform on a CRT.
OS/2
Acronym for Operating System /2. A high-level, multi-tasking
operating environment developed by IBM and Microsoft
for the PS/2 line of PCs.
Output
The product of an operation by a device going to some
external destination, such as another device, a video
screen, image or hard copy. The signal derived from
any audio or video device. The physical connection that
delivers the result of what the device does, such as
a signal. In A/V industry output is often used (erroneously)
as a verb. (i.e., "This device outputs composite
video.")
Overhead
Projector
A device which produces an image on a screen by transmitting
light through a transparent acetate placed on the state
of the projector. Can project transparencies up to 10"
x 10". Can also be supplied with a continuous roll
of acetate which can be moved over the stage by means
of a crank.
Overlay
The capability to superimpose computer-generated graphics
and/or text on motion or still video.
Overscan
Deliberate scanning in a television set or monitor in
which the active display area of the CRT
is filled with slightly less than the complete video
image. This enables the physical edges of the display
device to become the picture's boarders rather than
the blanking portions of the signal. The result of the
TV scan lines exceeding the boundaries of the display
screen.
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