Instruction manual

HDE-3000 - 82 -
Appendix B. Discussion of HD Subtitling
Definitions
SD standard definition video (NTSC and PAL).
HD high definition video (1080i, 1080PsF, 1080P, and 720P).
USF ULTECH subtitle file. A text file with the extension “.uyc” containing the
“navigation” information for a subtitle job.
UYC ULTECH luminance (Y) chrominance (C) image file. A specialized
graphics file similar to common image files such as BMP, TIF, etc., but
optimized for fast transfer speed into video overlay memory.
Subtitle job a collection of files containing all of the information needed to subtitle a
video program. A subtitle job for HDE-3000 consists of one USF file and
multiple UYC files (one UYC file for each subtitle).
x_position a parameter in a USF file that controls the horizontal positioning of a
subtitle on the TV screen. The units of this parameter are pixel pairs (a
side effect caused by the fact that 4:2:2 digital video only contains one
color value for every two pixels). This parameter specifies the number of
pixel pairs between the left edge of the TV screen and the left edge of the
subtitle image.
y_position a parameter in a USF file that controls the vertical positioning of a subtitle
on the TV screen. This parameter specifies the video line number in field
1 at which to place the top edge of the subtitle image.