AV/IT Glossary—27 Days of #AVabc—Y




Y-Cable—A Y-cable is a self describing name of a type of cable containing three ends of which one is a common end that in turn leads to a split into the remaining two ends. When looked upon, a Y-cable can resemble the letter "Y". Y-cables are typically, but not necessarily, short (less than 12 inches), and often the ends connect to other cables.


Y—Luminance or luma.

YC—A complex division of the video signal used in systems such as S-VHS* or Hi-8*. Due to the intricacy of YC, special processors, switchers, amplifiers, etc., are needed for video editing*.

YCbCr—The technical term for digital component video. The letter “Y” represents the luminance (brightness) portion of the component-video signal, and “Cb” and “Cr” are the color-difference signals.

YPbPr—The technical term for analog component video. The letter “Y” represents the luminance (brightness) portion of the component-video signal, and “Pb” and “Pr” are the color difference signals.

Y Signal—The luma signal transmitted in standard color video. In a color picture, the Y signal is made up of 0.30 red, 0.59 green, and 0.11 blue. It is compatible with a standard monochrome receiver.

Y to C Delay—Relative delay or timing of the luminance channel compared to the chrominance channel in a video system.

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. After luminance is subtracted from red and blue, the remainder is considered to be the green portion of the RGB video signal. These signals are derived as follows: Y = 0.3 red + 0.59 green + .11 blue; R-Y = 0.7 red - 0.59 green - 0.11 blue; B-Y = 0.89 blue - 0.59 green - 0.3 red

Y/C—The technical description of S-video. The luminance signal, Y, and the chrominance signal, C, are carried on separate signal/ground pairs. Because the Y channel is carried separately, higher bandwidth is possible and color subcarrier crosstalk is eliminated.

Y/C Separator (YCS)—A Y/C separator isolates the luma (Y) and chroma (C) components of a composite video signal. This is the first step necessary in decoding composite video.

YUV—Defines color space in terms of Y – luminance or brightness, and two color-difference components, U - red minus luminance and V - blue minus luminance. YUV is interchangeable with “Y Cb Cr” for digital component video and “Y Pb Pr” for analog component video.


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