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Dictionary of Technical Terms - Y
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Y
Y (luminance)
1. The luminance (brightness) portion of a video
signal, especially component video. The formula for deriving Y from
the red, green, and blue signals is .30R + .59G + .11B. 2.
Abbreviation for admittance, which is the reciprocal of impedance,
the ease with which alternating current flows through a
circuit.
Y, Cr, Cb
Color difference signal designation used for various
purposes, such as the CCIR/SMPTE standard digital component video
signal set (CCIR601, RP-125). Y corresponds to luminance, Cr
corresponds to the R-Y signal, and Cb corresponds to the B-Y
signal.
yellow signal
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, Pb, Pr
Color difference signal designation. Y corresponds
to the luminance signal, Pb corresponds to the scaled B-Y color
difference signal, and Pr corresponds to the scaled R-Y color
difference signal.
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 = 0.3Red + .59Green + .11Blue
R-Y = 0.7Red - 0.59Green - 0.11Blue
B-Y = 0.89Blue - 0.59 Green -0.3Red
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 difference signals
(respectively) when they are modulated onto subcarrier.
Y-axis
The vertical axis in a system of multi-dimensional
coordinates. See axis.
Y/C delay
See Y to C delay.
YIQ
NTSC and M-Format luminance and color difference
components.
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