USL UPC-28C - Manual (Page 6)

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UPC-28C Instruction Manual Ultra Stereo Labs, Inc.
Connect to shield of shielded-pair input cable.
d. Pin 5 & 6, 8 & 9: Channel A & B Audio Input Terminals.
Channel A is modulated on a 2.3MHz FM carrier. Channel B
is modulated on a 2.8 MHz FM carrier. Either or both channels
are transmitted by the IR panel. Balanced, differential input. One
side of each may be grounded for unbalanced sources. Ground
at source is recommended.
e. Pin 7 & 10: Audio system ground
11. BNC RF Connectors.
RF connectors provide connection to additional emitter panels in multi-
panel installations. (see page 12)
• SMPTE 428-7, which describes the XML (extensible markup language) struc-
ture of “timed text” files that are used for subtitles and captions.
• SMPTE 428-10, which constrains SMPTE 428-7 for closed captions. These
constraints limit the timed text file such that the captions can be displayed
on commonly used displays. These constraints deal with the number of lines
in a caption, the number of characters in a line, disallow multiple captions at
the same time, etc.
• SMPTE 430-10, which describes the Auxiliary Content Synchronization Pro-
tocol. This protocol provides synchronization information to Auxiliary Content
Servers (such as the IRC-28C) that handle captioning, seat shakers, light-
ning strobes, and other auxiliary content that may be played back in syn-
chronization with the projected image. The IRC-28C initiates a connection
over Ethernet to the Digital Cinema Server (DCS). The DCS then tells the
IRC-28C where various files required for caption playback are located, tells
the IRC-28C when playback is started and stopped, and provides timeline
information to the IRC-28C to synchronize the captions with the audio and
image.
• SMPTE 430-11, which describes the Auxiliary Content Resource Presenta-
tion List. This file, created by the DCS, contains a list of the auxiliary resourc-
es (such as captions), the time in playout this resource is to be used, and the
language of the resource. Using the Auxiliary Content Synchronization Proto-
col, the DCS tells the IRC-28C where this file is located. The IRC-28C
fetches and parses this file. The IRC-28C then uses the information in this
file to determine the location, language, and time of use of each of the cap-
tion (timed text) files. The IRC-28C then fetches and parses the timed text
files and sends them to the displays at the proper time.
The Society of Motion Picture and Television Engineers has established sev-
eral standards that are used to provide closed captioning in digital cinema. These
include:
Introduction to SMPTE Captioning