Thread Subject: FCC text size requirements; CEA708
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From: Larry Goldberg
Date: Tue, Feb 19 2008 12:10 PM
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As noted, the FCC parameters relate to MAXIMUM size of text, not
MINIMUM.
However, the CEA708 spec (which is incorporated by reference by the
FCC), does talk about relative minimums of the SMALL caption option.
See language from both documents below:
from FCC 00-259
page 34:
"(j) Pen Size. Decoders must support the standard, large, and small
pen sizes and must allow the caption provider to choose a pen size and
allow the viewer to choose an alternative size.
The STANDARD pen size should be implemented such that the height of
the tallest character in any implemented font is no taller than 1/15
of the height of the safe-title area, and the width of the widest
character is no wider than 1/32 of the width of the safe-title area
for 4:3 displays and 1/42 of the safe-title area width for 16:9
displays.
The LARGE pen size should be implemented such that the width of the
widest character in any implemented font is no wider than 1/32 of the
safe-title area for 16:9 displays. This recommendation allows for
captions to grow to a LARGE pen size without having to reformat the
caption since no caption will have more than 32 characters per row."
[it appears the FCC left out the parallel verbiage relating to SMALL
pen sizes, as referenced by CEA708 below].
from CEA708
pg. 50
"8.5.1.2 LARGE and SMALL Pen Size
...
a) Characters in the LARGE pen size should be no wider than 42/32
times the width of characters in the STANDARD pen size...
[height should be no taller than 42/32 times the height of STANDARD
characters]
b) Characters in the SMALL pen size should be no narrower than 32/42
times the width of characters in the STANDARD pen size...
[height should be no shorter than 32/42 times height of STANDARD
characters]
... Larry ...
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