Miranda XVP-801i, Инструкция по установке и эксплуатации

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GUIDE TO INSTALLATION AND OPERATION
12 | XVP-801i
The HD Video Output and SD Video Output groups
These groups allow controls over several aspects of the high definition and standard definition video output:
aspect ratio conversion, timing control, image quality processing, and metadata insertion.
Figure 3.3 HD (left) and SD (right) Video Output group – ARC tab
The upper portion of the panel is occupied by two video screen images, labelled Input and Output. These
screens do not show the actual video being processed by the XVP-801i, but rather show graphic images that
represent the geometric aspects of the input signal and the output that results after it is exposed to the
current ARC processing functions. The image is a green circle on a white background; the circle is used
because it is easy to see if it is asymmetrical.
Aspect Ratio Conversion (ARC) modifies the video active picture shape as the signal is converted between
SD at 4:3 aspect ratio and HD at 16:9 aspect ratio. If the input is simply stretched or squeezed to fit the
output, the image will be asymmetrically distorted; this is called
anamorphic distortion. If the image is
expanded or contracted symmetrically, it must be cropped, and/or have new blank background segments
added to it, in order to fill the output picture. The ARC processing in the XVP-801i allows a wide range of
symmetrical and asymmetrical picture size modification, coupled with cropping and background addition, to
be applied to an input signal.
There are several common approaches to aspect ratio conversion. These have different consequences
depending on whether the conversion is 4:3
à
16:9 or 16:9
à
4:3:
4:3
à
16:9 16:9
à
4:3
Symmetrical scaling to include the
entire input image in the output,
and add a background to fill in the
remaining space. Background sidebars occupying
25% of screen width
25% Side
Letterbox format, with upper and
lower background segments
occupying 25% of screen height.
25% Lbox
Symmetrical scaling to gently crop
the input image in the output, and
add a background to fill in the
remaining space. Background sidebars occupying
12% of screen width
12% Side
Letterbox format, with upper and
lower background segments
occupying 12% of screen height
12% Lbox