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Manual # 26-0302000-00 / Revision E ImagePRO – Multi Format Image Processor
33
This menu allows the user to set the input signal aspect ratio. The menu is:
The Mode value is selected among the following choices: 1:1, 3:2, 4:3, 5:4, 16:9, Custom
The ImagePRO will select and display the input video aspect ratio according to the input format detected. For
example, computer video at 1280x1024@60Hz
will default to 5:4 aspect ratio, NTSC video will default to 4:3 aspect
ratio, and HDTV1080i video will default to 16:9 aspect ratio.
The Ratio line is only visible when the selected mode is Custom. It is a decimal number ranging from 0.750 to 3.000.
The default value is dependent on the last Mode aspect ratio value before Custom is selected.
Letterbox selection
The value selections are: Off, On.
When Off is selected, the image will be allowed to fill the entire output raster. If On is selected, the top and bottom of
the output raster are cropped to a 16:9 Aspect Ratio. This feature is especially useful when used with Wide-Screen
DVD sources. It allows the user to process this type of source without seeing the Black Bars at the top and bottom of
the image.
Processing Submenu
The Sync Sel menu item applies only to analog RGB inputs. The digital input sources have embedded syncs, and the
composite, S-video, and YPbPr inputs always will take the sync from the Y (or composite) channel. For these inputs,
the value field will indicate n/a. The sync choices are Auto, H/V, CSync, and SOG. In Auto mode, the system will find
the sync in any of the three possible sources. If one of the sources is explicitly chosen, the system uses only that
input as a sync source, unless it finds there is no sync input at that source. In which case it will act as if it is in Auto
mode.
The Sync Slice menu item selects the sync comparator threshold for RGsB (RGB with Sync on Green) or YPbPr
analog component video sources. The value can range from 20mV to 280mV and is adjustable in steps of 10mV. The
default value is 160mV. When ImagePRO detects Macrovision copy protection on the incoming YPbPr NTSC/PAL
video, the Sync Slice value is automatically repositioned to 60mV to account for the reduced amplitude sync pulse.
NOTE: The default Sync Slice level has been optimized for virtually all sources that will be encountered and
should rarely, if ever, require adjustment. However, the ability to adjust the Sync Slice level is provided to
improve sync detection/synchronization in cases of extremely noisy RGsB or YPbPr video signals.
INPUT ASPECT RATIO
> Mode <val>
Ratio <val>
PROCESSING
> Sync Sel [val]
DeIntlc [val]
Pulldown Comp [val]
Sync Slice (mV) [val]