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Dictionary of Technical Terms - O
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Outside broadcast. A remote broadcast.
A mobile truck, van, or trailer that houses a remote
broadcast switching and control center for broadcasting news and
sports.
1. Signals that are not currently going out to
broadcast or videotape recording. 2. Signals received "out of the
air" from a transmitter. To record signals off the air.
Not in use. Inactive.
Editing that is done using inexpensive,
non-broadcast-quality equipment to produce an edit decision list
(EDL) which will be used later for assembling a broadcast-quality
program using more expensive, high-quality equipment.
The unit of resistance. The electrical resistance
between two points of a conductor where a constant difference of
potential of 1 volt applied between these points produces in the
conductor a current of 1 ampere, the conductor not being the source
of any electromotive force.
Grass Valley Group trademarked name for the keying
system used in the Model 300 switcher.
Open network architecture.
The video signal in question is being broadcasted or
videotaped. In Kaleidoscope, a portion of a channel's picture is on
screen or its output is being combined with another digital effects
processor to create the final video output.
A digital picture manipulator term meaning to switch
input crosspoints (video sources) when the back (hidden) side of a
double-sided transformed image rotates to the front and the front
(visible) side rotates to the back. The switching occurs at the
moment when only the edge of the image is visible.
In use. Active.
Final editing session in which the finished program
master is assembled from the original production material.
A circuit that produces an output signal of fixed
duration when an input signal of any duration is applied.
Setting edit points while VTRs are rolling. A
non-precision method of editing similar to live video
switching.
Edit that has a start time but no designated
out-point. An edit that runs until stopped by the operator.
The program (software or firmware) that controls a
computer's functions.
An optical fiber with a high refractive index clad
with a material having a lower index of refraction.
A coupling device consisting of a light emitter and
a photodetector used to couple signals without any electrical
connection. Used for voltage and noise isolation between input and
output while transfer- ring the desired signal.
A transform which causes an object to move in a
circle around a point on the X-Y grid.
Diodes arranged in such a way as to construct an OR
gate.
Sampling of a line of repetitive video signal in
such a way that samples in each line are in the same horizontal
position.
An electronic device that generates
alternating-current at a frequency determined by the values of the
components in its circuits.
Open systems interconnection.
Originating service office.
Optical time domain reflectometer. A device that
tests losses in optical fiber.
An edit out-point. The first frame that is not
recorded (after the end of an edit).
Edit out-point timing.
The current, voltage, power, or driving force
delivered by a circuit or device.
The impedance a device presents to its load. The
impedance measured at the output terminals of a transducer with the
load disconnected and all impressed driving forces taken as
zero.
See return loss.
In electronic equipment, the final stage that
produces the finished output signal(s).
The ratio of attenuation provided by the output
stage to an interfering signal driving one output compared to a
second output. The ratio is measured at the second output. A good
specification protects output signals against incorrect cabling,
such as accidental untermination or double termination.
A remote broadcast, typically from a remote
truck.
A crystal oscillator that is surrounded by a
temperature regulated heater (oven) to maintain a stable frequency
in spite of external temperature variations.
1. In audio or video, a signal that is superimposed
over a second signal. Also called voice over in audio. 2. In video
switchers, a selection that determines which key layer appears on
top of the other key layer in a mix/effects.
A video monitor condition in which the raster
extends slightly beyond the physical edges of the CRT screen,
cutting off the outer edges of the picture.
The first maximum excursion of a pulse beyond the
100% level. That portion of a pulse that exceeds its defined level
temporarily before settling to the correct level. Overshoot
amplitude is expressed as a percentage of the defined level. See
also ringing.
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Copyright © 2001 Grass Valley Group -
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