
An al og S DTV syn c,
genlock, and interface
34
In analog interlaced video, 0 v
denotes the start of either field. In
digital video, 0 v for the second field
is unimportant; some people use 0 v
to denote the start of a frame.
In analog SDTV, sync is combined with video and
conveyed by levels "blacker than black:' This chapter
explains the construction of analog sync, and explains
sync separation,
which recovers the significant timing
instants associated with an analog video signal, and
genlock,
which reconstructs a sampling clock.
In analog video, line sync is achieved by associating,
with every scan line, ...