GUIDE TO INSTALLATION AND OPERATION
22
| XVP-1801
The Input Screen
The
Input
preview screen shows the portion of the input image which will be presented at the XVP-1801
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] for SD inputs and [16:9, Auto,
Forced] for HD inputs.
Note 1 – Auto mode:
When Auto is selected, all the ARC values are automatically set based on the AFD
flag detected at the input, and the ARC controls and presets described below are
disabled
. Annex 2
shows the AFD functions implemented. If no AFD flag is detected at the input, the card uses the Default
AFD flag specified in the AFD tab
Note 2 – Forced mode:
Forced mode is useful when the input AFD flag is unreliable, missing or if the user
wants a simple way to force the aspect ratio conversion. The function is the same as the Auto mode,
except that the incoming AFD flag is ignored, and a user-specified forced flag is used instead. As in the
Auto mode, the ARC controls and presets described below are
disabled
.
The input screen shows how much of the input signal will appear at the output after the ARC processing in
the XVP-1801. It does so by showing any cropped portions of the image in blue.
The Output Screen
The output screen shows the final result of the ARC processing.
•
The side panels or letterbox is shown in the selected background color
•
The masks are shown in Gray
A pull-down menu at the bottom of the screen allows the user to select some parameters of the output:
•
SD outputs: allows the output aspect ratio to be set to either
4:3
or
16:9
.
•
The
Format
pull-down is used to select the output format: 720 (or 704) x484i 59; 720 (or 704) x576i 50;
1920x1080i or 1280x720p.
¾
Note – when an HD input is down-converted to SD, the output H resolution can be selected as either
720 pixels (default) or 704 pixels. The choice is made in the
Video Output – Advanced
panel (see
details on page 28) and appears in the pull-down beneath the output screen. In all other cases the
SD H resolution is 720 pixels.
The
ARC
tab
Under the
ARC
tab, several sub-sections are found allowing extended control over how the output will be
displayed. For convenience, presets are available for frequently-encountered aspect ratio conversions.
•
These controls are disabled when the ARC Mode pulldown on the Input Screen is set to
Auto
or
Forced
Input sub-section
Input: Crop – Horizontal and Vertical
The crop controls allow selection of a portion of the original image – the amount of horizontal and vertical
cropping is expressed as a percentage of the size of the original image.
The user can manually adjust the level of horizontal and vertical cropping. Horizontal cropping is done on an
8-pixel basis. Vertical cropping is done on 4-line basis. To achieve non-symmetrical vertical or horizontal
cropping, uncheck the
Center
box underneath and position the image using the
Tilt
function described below.
Input cropping changes the scaling factor between the input and the output. If we crop the input (H&V) by
10%, the output image is resized and scaled by +10%. By providing different H and V cropping, the user can
produce an anamorphic image.
The padlock icon appearing next to the data window allows the data to be “locked”. See the paragraph
Locking controls
under
Output sub-section
below for a discussion of this option.