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Dictionary of Technical Terms - Y


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Num

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.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Num

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