138
Configuring Alarms
Teletext, Subtitles, and Closed Captions
Teletext, Subtitles, and Closed Captions
Teletext subtitling (based on WST or OP-47), NTSC closed captioning (CEA-608), and ATSC
Digital Television Closed Captioning (CEA-708 DTVCC) can be displayed on the monitor
wall, allowing visual monitoring of decoded text from an analog or SDI video source. The
lines of text extracted from the video source metadata are displayed within the
corresponding video window.
Teletext may comprise up to 799 pages of displayable data (numbered from page 100 to
899). Teletext subtitles are decoded as described by the ETSI ETS 300 706 standard. At any
time, only one page can be decoded per video monitor and only one page can be decoded
per video source, for monitoring purposes. In addition, the multiviewer can monitor the
presence of up to three more pages (without decoding their content). Refer To
Setting a
Video Monitor’s Text Mode, on page 223, and Displaying Subtitles and Closed Caption Text,
on page 40, for more information.
The following table contains a list of supported video formats, and the type of captioning,
teletext, or subtitling data that is decoded by default for each video format, when a video
monitor’s text mode is set to Auto sense: DTVCC (708), CC (608), teletext (OP-47 or WST), or
none.
Note: The CEA-708 standard supports legacy CEA-608 data. In the case of
an HD-SDI source carrying both 708 captions and 608 legacy caption data,
the multiviewer will display the 708 captions, and automatically fall back to
displaying the 608 captions only if the 708 data becomes unavailable.
Video format Decoded data Video format Decoded data
720p 59 94 Hz DTVCC (708) SDI 525 507 generic CC (608)
720p 59 94 Hz EM DTVCC (708) 720x480p 59 94 Hz DTVCC (708)
720p 29 97 Hz DTVCC (708) UNKNOWN HD None
720p 29 97 Hz EM DTVCC (708) UNKNOWN SD None
720p 50 Hz Teletext INVALID None
720p 50 Hz EM Teletext NTSC-M CC (608)
720p 25 Hz Teletext PAL-BGDHI Teletext
720p 25 Hz EM Teletext PAL 60 Hz Teletext
720p 24 Hz DTVCC (708) NTSC 50 Hz CC (608)
720p 24 Hz EM DTVCC (708) NTSC 4.43 CC (608)
1080i 59 94 Hz 30 Hz PSF DTVCC (708) PAL-N Teletext
1080p 29 97 Hz DTVCC (708) PAL-M Teletext
1080i 50 Hz 25 Hz PSF Teletext NTSC-N CC (608)
1080p 25 Hz Teletext NTSC-J CC (608)
1080p 25 Hz EM Teletext SECAM Teletext
1080 25PSF EM Teletext Component Y Only 525 None
1080p 23 98 Hz 24 Hz DTVCC (708) Component Y Only 625 None
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