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CEA 608 to CEA 708 DTV CC Transcoder and FCC requirements

Federal Communications Commission (FCC) rules incorporate sections of industry standards EIA-708 and EIA-608. The K2 Summit system system fulfills the requirement for older materials that do not have DTV CC. If SD material has EIA-608 CC present, the K2 Summit system system can be configured so that when it up-converts the material the EIA-708 packet contains the EIA-608 data plus the DTV CC transcoded from EIA-608.

DTV CC transcoding is enabled on a per channel basis in the Configuration Manager under Channel Configuration.  By default, transcoding is disabled and the behavior is the same as prior software releases that did not support this transcoding. When enabled, transcoding is applied to any CEA 708 packets played out to either 1080i or 720p outputs (NTSC timing only). Transcoding happens for the following cases:
  • SD clips are recorded with CC on the data track.
  • SD MPEG clips with CC in the MPEG user data.
  • DVCPRO25 clips with CC in the DV frame.
  • HD clips with CEA 708 packets on the data track that have Line 21 data is present and DTV CC is absent.

CEA 608 commands from the above sources are converted to CEA 708 DTV CC commands that generate caption presentations that are similar to the original CEA 608 captions. The appearance is similar but not the same due to the differences in fonts, text positioning, etc.

This applies to up-conversion only. HD material should already have compliant EIA-708 packets.


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