EN530 HDTV Smart Encoder IV
Switch 4: Force Regeneration
Activating this function causes all locally input caption data to be ignored.
Upstream caption data will be regenerated as if no local caption modes were
active.
The GPI switches can also be configured to perform caption display relocation.
Caption displays can be remapped to avoid either the top rows or bottom rows
of the television screen to avoid blocking emergency information, news crawls,
or other important graphics. The FCC requires that emergency alert
information be visible to closed caption viewers.
Configure GPI Switches
<CTRL+A>R switch1 switch2 switch3 switch4 <ENTER>
Each of the four parameters assigns a function to the respectively numbered
GPI switch. Each parameter should be set to either
–
(subtract sign),
to indicate
that the switch should perform its default function (described above), or a two
character string that will create a new caption relocation function. The first
character of a caption relocation function should be either
t
to protect an area at
the top of the screen by bumping captions down, when necessary, or
b
to
protect an area at the bottom of the screen by bumping captions up. The second
character should be an integer between 2 and 4, indicating the number of
captioning rows that should be protected. There are 15 logical caption rows in
the safe title area of the video, so a row value of 2 will protect 2/15 of the safe
title area. Once a caption remapping function has been created, simply short
the corresponding GPI switch input to ground in order to activate the function.
Example:
<CTRL+A>R – b3 t2 - <ENTER>
assigns the second GPI switch
to protect the bottom 3 rows of the screen from caption overlay and the third
switch to protect the top 2 rows, and leaves the first and fourth switches to
perform their default operations.
To place the above command in NVM so that the encoder will automatically
power up in the mode described in the example above, you would enter:
<CTRL+A>w p1 <CTRL+A>R – b3 t2 - <ENTER>
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