VANC Readahead
The HD492 encoder performs many default tasks for the purpose of cleaning up incoming VANC data. These tasks
include removing packets that have been marked for deletion, packets that contain illegal embedded black pixels
and so on. The delay buffer required to process VANC data in this manner results in a minor latency slightly greater
than one half of a video line. The settings found under the VANC Readahead feature will allow you to control the
delay buffer. To disable the advanced VANC processing features in cases where they are not required navigate to
System Setup > VANC Readahead from the front panel LCD and select the “¼ Line” option.
Decoder Output Video Blanking
The Video Blanking feature creates a secondary blank (black) decoder output with open captions displayed in
addition to the master output of captioned video. Blanking requires video input on the master input of the unit to
operate and provides open captions over black video on the Aux Mon output (Decoder Output) only. Turn Video
Blanking on/off by navigating to Decoder Setup > Blank Output from the front panel LCD.
Black 1080i Video Generation
The Black 1080i Video Generation feature creates a high definition black video on all outputs with closed captions
displayed (open captions will display on the decoder output). This feature requires no video input to the unit as it
is intended to serve users who do not have a video source and only seek to output closed captions over black
screen. To provide audio reference to a remote captioner in this scenario, the HD492 accepts AES digital or analog
audio through the rear panel XLR connector which is configurable from the LCD control on the front panel. Turn
Black 1080i Video Generation on/off by navigating to Utilities > Generate 1080i from the front panel LCD. When
the feature is active a “Gen: 1080i60” indicator will display on the front panel LCD home screen.
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