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Closed captioning is commonly used to refer to the system used in North America and other regions that historically broadcast in the analogue NTSC format.
Closed Caption (CC) or EIA-608B subtitling is also known as Line 21 subtitling as line 21 is the preferred video line the subtitle data is inserted onto (NTSC video line numbering only). The EIA-708 standard has been introduced to support Closed Captioning in a high definition digital environment.
Closed Caption subtitling should not be confused with the technically similar Teletext system.
This white paper explains the usage of Closed Captions, how they fit in to a transmission and some advantages and disadvantages.