scope:

This document is intended as a definition of DTV Closed Captioning (DTVCC) and provides specifications and guidelines for caption service providers, DTVCC decoder and encoder manufacturers, DTV receiver manufacturers, and DTV signal processing equipment manufacturers. This specification includes the following:

• a description of the transport method of DTVCC data in the DTV signal
• a description of DTVCC specific data packets and structures
• a specification of how DTVCC information is to be processed
• a list of minimum implementation recommendations for DTVCC receiver manufacturers
• a set of recommended practices for DTV encoder and decoder manufacturers

The use of the term "DTV" (Digital Television) throughout is intended to include, and apply to, HDTV (High Definition Digital Television) and SDTV (Standard Digital Television) which use the digital data stream specified in ATSC A/53 and related ATSC A/54.