Digital Closed Captioning

For ATSC (digital television) programming, three streams are encoded in the video: two are backward compatible Line 21 captions (CEA-608), and the third is a set of additional caption streams encoded in EIA-708 format. The captioning data is carried in the video user bits of the MPEG-2 bitstream (as specified in ATAC A/53B) and is applicable to both HD and SD. The CEA-708 specification provides for improved captioning compared with CEA-608:

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