Belden Grass Valley XVP-3901-DPI, Manual To Installation And Operation, Page: 38 / 87

GUIDE TO INSTALLATION AND OPERATION
32 | XVP-3901-DPI
5.5 Video Outputs panel – SD Output tab
This panel allows control over several aspects of the standard definition video output:
•
aspect ratio conversion
•
timing control
•
image quality processing
•
metadata insertion.
Note that since the XVP-3901-DPI does not include up/down/cross functionality, only limited functionality will
be provided in this panel. Furthermore, this panel will be available only when the input video signal is SD,
otherwise it will be dimmed.
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-3901-
DPI, 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. Lines on the images indicate protected areas
for the AFD implementation.
Aspect Ratio Conversion (ARC) modifies the video active
picture shape as the signal is converted between SD at 4:3
aspect ratio and SD 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-3901-DPI allows a wide range of
symmetrical and asymmetrical picture size modification,
coupled with cropping and background addition, to be applied
to an input signal.
When the Input AFD Mode is set to
Auto , all the ARC
settings are set automatically according to the AFD flag (see
the table in Annex 2 beginning on page 76) and cannot be changed by the user.
•
There are some exceptions – with certain input AFD codes the masks can be customized. Each mask can be
customized for each different AFD code allowing different mask settings according to each specific code. For
certain AFD codes that are less used, the masks cannot be configured and will be de-activated.
The Input Screen
The Input preview screen shows the portion of the input image
which will be presented at the XVP-3901-DPI output. It has a
pull-down
AFD Mode menu at the top left corner through which
the user selects the aspect ratio of the input signal.
•
Available choices are: 4:3, 16:9, Auto, Forced.
Figure 5-22 Video Outputs - SD Output
Figure 5-23 Screens for SD Output