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start of active video (BT.656) (SAV)

Indigital TV, the beginning and end of a line in the SDI signals are identified by corresponding data words.

Video line of a BT.601 signal according to BT.656

Video line of a BT.601 signal according to BT.656

At the beginning of a line Start of Active Video (SAV) is transmitted, at the end with End of Active Video( EAV). In between is the data stream with the line content.

The SAV data word comprises four or eight bytes and identifies the start of a line, also whether this line contains visible picture content or whether it is a dark-keyed line in the vertical blanking interval, and furthermore to which field the line belongs. The SAV signal is also used for synchronization.

The entire data stream is specified in BT.656.

Informations:
Englisch: start of active video (BT.656) - SAV
Updated at: 25.11.2008
#Words: 120
Links: television (TV), line, serial digital interface (SDI), data, end of active video (BT.656) (EAV)
Translations: DE
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