A measure of electrical power. The power expended when I ampere of
direct current flows through a resistance of I ohm. The unit of
electric power required to do work at the rate of 1 joule per second.
Calculated by multiplying volts times amperes.
The shape of an electromagnetic wave. A graphical representation of
voltage or current in relation to time.
A device used to examine the video signal and synchronizing pulses.
An oscilloscope designed especially for viewing the waveform of a video
A system of material designed to direct confined electromagnetic
waves in a direction determined by its physical boundaries.
The maximum excursion of the video signal in the white direction at
the time of observation.
- Video containing information or allowing information entry, keyed
into the video monitor output for viewing on the monitor CRT. A window
dub is a copy of a videotape with time code numbers keyed into the
- A video test signal consisting of a pulse and bar. When viewed on a
monitor, the window signal produces a large white square in the center
of the picture.
A transition between two video signals that takes the shape of a
geometric pattern. X-Y panel--A routing switcher control panel that
uses the X-Y model for making crosspoint selections.
- The luminance (brightness) portion of a video signal, especially
component video. The formula for deriving & from the red, green, and
blue signals is 0.30 R + 0.59 G + 0.11 B.
- Admittance, which is the reciprocal of impedance, the ease with
which alternating current flows through a circuit.
In telecommunications, a signal sent back in the direction of a
failure, indicating that the input of a network element has failed. The
yellow signal varies with the DS framing used.
Y, R-Y, B-Y
Color difference signal designation. Y corresponds to the luminance
signal, R-Y corresponds to the red minus luminance signal, and B-Y
corresponds to the blue minus luminance signal. These signals are
derived as follows:
Y to C delay
Relative delay or timing of the luminance channel compared to the
chrominance channel in a video system.
Y, U, V
PAL luminance & color difference components. U and V are the names
of the B-Y and R-Y color differences signals (respectively) when they
are modulated onto subcarrier.
- Y = 0.3 Red + 0.59 Green + 0.1 Blue
- R-Y = 0.7 Red + 0.59 Green - 0.1 Blue
- B-Y = 0.89 Blue - 0.59 Green - 0.3 Red