evertz 570DSK-12G-F, User Manual

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570DSK-12G-F
Keyer With Logo Insertion
Page 43
6. DEFINITIONS
4:2:2: The sampling ration used in the HDTV digital video signal. For every 4
samples of luminance, there are 2 samples each of R-Y (red minus
luminance) and B-Y (blue minus luminance).
16x9: A wide-screen television format such as HDTV in which the aspect ratio
of the screen is 16 units wide by 9 units high as opposed to the 4x3
aspect ratio of traditional SD television.
AES/EBU:
Sometimes abbreviated as AES. Refers to the digital audio standard
(AES3-1992) set by the Audio Engineering Society and European
Broadcast Union and used by most forms of digital audio from CDs to
professional digital video.
ASPECT RATIO:
The ratio of width to height in a picture. Theatre screens generally have
an aspect ratio of 1.85 to 1, widescreen TV (16x9) is 1.77 to 1, and
traditional SD TV (4x3) is 1.33 to 1.
CCIR:
Abbreviation for International Radio Consultative Committee, an
international standards committee. This organization is now known as
ITU.
CCIR-601:
See ITU-R601.
CLIFF EFFECT: Also referred to as the ‘digital cliff.’ This is a phenomenon found in digital
video systems that describes the sudden deterioration of picture quality
when due to excessive bit errors, often caused by excessive cable
lengths. The digital signal will be perfect even though one of its signal
parameters is approaching or passing the specified limits. At a given
moment however, the parameter will reach a point where the data can
no longer be interpreted correctly, and the picture will be totally
unrecognizable.
COMPONENT
ANALOG:
The non-encoded output of a camera, video tape recorder, etc.,
consisting of the three primary colour signals: red, green, and blue
(RGB) that together convey all necessary picture information. In some
component video formats these three components have been translated
into a luminance signal and two colour difference signals, for example
Y, B-Y, R-Y.
COMPONENT
DIGITAL:
A digital representation of a component analog signal set, most often Y,
B-Y, R-Y. The encoding parameters are specified by ITU-R709 for
HDTV signals. SMPTE 274M and SMPTE 296M specify the parallel
interface.
COMPOSITE
ANALOG:
An encoded video signal such as NTSC or PAL video that includes
horizontal and vertical synchronizing information.
COMPOSITE
DIGITAL:
A digitally encoded video signal, such as NTSC or PAL video that
includes horizontal and vertical synchronizing information.