AJA io XT, Installation And Operation Manual, Page: 35 / 66

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Io XT Installation and Operation Manual — Control Panel Operation
Input Pass through: this selection directs Io XT to route video from its selected
input through the card for processing and output. When this selection is in
effect, all Primary/Secondary Format selections are available for selection in
controlling the output. This in effect makes the Io XT a converter when used in
conjunction with the AJA Control Panel application and a Mac. No applications
other than the AJA Control Panel need to be open to convert audio and video
from one format to another. For example, if an SD source tape needs to be
dubbed to an HD tape, the signal might be routed from the SD VTR to the Io XT,
configured for upconversion in the AJA Control Panel and then passed through
to the HD VTR for recording.
Test Pattern: this selection directs Io XT to output a choice of preset pattern
when no other application is using the Io XT. You can choose from:
Black, Color bars (75% or 100%), Ramp, Multiburst, Line Sweep, Multi Pattern, or
Flat Field.
In addition to the preset test pattern choices, a “Load File...” selection at the
bottom of the menu allows you to load any standard Mac RGB graphics file
(.tif,.psd, etc.) into the frame buffer for display.
While in Test Pattern mode, you can select RGB or YUV output via a pulldown
menu.
Note: the graphic file will not be scaled to fit. If it's smaller than the current frame
buffer format, Io XT will center it in the frame. If it's larger than the current frame
buffer format, it will be cropped on the right and bottom. Also some graphics
formats and bit depths may not be supported. Once a graphic file is loaded into the
frame buffer it will be retained until it is overwritten by another graphic or test
pattern, or when power is turned off. Graphic file names are only “remembered” in
the menu as long as the AJA Control Panel application is running.
Hold Last Application: this selection directs Io XT to hold and output the last
frame of video from the last application to control Io XT. This can be helpful
when operating in an environment where you're switching back and forth
between multiple application windows.
Tip:
pressing and holding the Apple COMMAND key while clicking in the AJA
Control panel—while in any software application—causes control of the Io XT to
stay with that application, rather than shifting to the Control Panel. This works
regardless of the setting of “Default Output.”
Playback Timing—Use these controls to set Genlock and Timing adjustment.
Genlock (Freerun, Ref In, Video In)—selects how Io XT will synchronize program video:
Freerun: In this mode, Io XT generates sync without an external reference source
Ref In: Directs Io XT to use the Ref Video source for sync (usually an analog black
burst video signal)
Video In: Directs Io XT to use whichever video input source has been selected in the
Inputs tab window for sync
Timing (Horiz and Vert)—these two pull-downs allow output timing adjustment with
reference to the Ref Video source selected. The Horizontal reference can be
adjusted by selecting a number of pixels (clocks) to offset. Vertical can be adjusted
by specifying a number of lines to offset.