Specific 9590 Terminology/Definitions - evertz 9590 Instruction Manual

frequencies of the luminance channel to the two colour difference channels. For every four
luminance samples, there are two samples of each colour difference channel.
4Fsc Four times subcarrier sampling rate uses in composite digital systems. In NTSC this is 14.3
MHz. In PAL this is 17.7 MHz.
ANALOG APERTURE
nominal transmission blanking. Normally it is centered on the production aperture.
ASPECT RATIO Defines the ratio of the horizontal dimension to the vertical dimension of an image
area when displayed according to the specifications of the video standard.
CENTRE OF IMAGE The centre of an image is defined as the center of the clean aperture. Horizontally
there will be an equal number of pixels within the clean aperture to the left and right of the
center point. Vertically there will be an equal number of lines within the clean aperture above
and below the center point.
CLEAN APERTURE Defines a subset region of the production aperture, which is completely inside the
blanking region. Normally it is centered on the production aperture. The clean aperture lies
completely inside the picture area remaining after application of the widest blanking permitted
for the standard. The dimensions for the clean aperture define the nominal aspect ratio for that
standard. Where both composite and component versions of a standard exist, clean aperture
is defined with respect to the image lattice specified for the component version.
EDGE PROCESSING REGION
aperture. Blanking transitions should occur completely within the edge processing region.
IMAGE LATTICE A two-dimensional array of pixels.
PIXEL ASPECT RATIO
pixel when an image is displayed at its defines aspect ratio.
PRODUCTION APERTURE Defines a maximum possible image extent in a given standard.
production aperture represents the desirable extent for image acquisition, generation and
processing prior to blanking. Where both composite and component versions of a standard
exist, production aperture is defined with respect to the image lattice specified for the
component version.
SAFE ACTION Defines the image region where all significant action must take place. It is defined
as a fixed percentage of the clean aperture for a given video standard.
SAFE TITLE Defines the image region where the most important image information including titles and
graphics must be confined top ensure visibility of the information on the majority of home
television receivers. It is defined as a fixed percentage of the clean aperture for a given video
standard.

1.2.2. Specific 9590 Terminology/Definitions

OBJECT This is the object that is generated by the Graticule Generator and burned onto the video
output. The Graticule Generator can generate the following objects: 1 grid consisting of a pair
OVERVIEW
Models 9590 & HD9590 Graticule Generator Manual
Defines a subset region of the production aperture, which coincides with the
The region of the production aperture that lies outside the clean
Defines the ratio of the horizontal dimension to the vertical dimension of a
Revision 1.4
The
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