LAWO V_pro8, Руководство по установке и эксплуатации

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V1.0/2 106 V_pro8 Manual
Glossary
Glossary
3G 3G is a HD-SDI format which operates at 2,97Gbit/s. This is a higher data
rate than used by 1,485Gbit/s HD-SDI. There are two versions of the 3G-
SDI format - Level A, used for 1080p high data rate signals, and Level B,
used to carry two 1,485Gbit/s HD-SDI signals down a single wire.
1080i Used to describe a picture resolution of 1920 x 1080 pixels, which uses
interlaced (i) scanning. See Frame.
1080p Used to describe a picture resolution of 1920 x 1080 pixels, which uses
progressive (p) scanning. See Frame.
720p As for 1080p, but the picture resolution is 1280 x 720 pixels.
16:9 Describes the picture's aspect ratio (Width : Height) used in cinema screen
and widescreen digital TV. The ratio is used in all High Definition, and some
Standard Definition TV.
4:3 Describes the picture's aspect ratio (Width : Height) used in PAL or NTSC
TV.
48kHz or 44.1kHz See Sample Rate.
AFD Active Format Description
A code number which is embedded in digital video signals, to control the
way in which a 16:9 image is adapted for a 4:3 display. The AFD code
describes the portion of the 16:9 image which is important and should
therefore be presented to the 4:3 viewer. The AFD code can be changed on
a programme by programme basis, so that a consumer set top box can
react to programme material from different productions and eras.
Anamorphic Video which is squeezed or stretched to fit a particular screen size.
Aspect Ratio Width versus Height of the video screen. Common aspect ratios are 16:9
(widescreen TV) and 4:3.
Bargraph An optical display instrument in the shape of a LED bar for displaying audio
signal level.
Chrominance Chroma or C for short.
Chrominance is used in video systems to convey the colour information of
the picture, and is paired with Luminance (Y) which represents the
brightness of the image.
Chroma is usually represented as two color-difference components: U =
Blue - Luma, and V = Red - Luma. The U and V components are also
known as Cb (Chroma blue) and Cr (Chroma red).
RGB sources, such as the output of a camera, are usually converted into
YUV so that video systems can process the brightness (Y) and colour
information (U and V) separately. This is useful as the human eye is more
sensitive to luminance (Y), than to changes in chrominance (UV).