
SAAPTE RP 168,
Definition of
Vertical Interval Switching Point for
Synchronous Video Switching.
576i standards documents indi-
cate a precorrection of 1/2.8,
approximately 0.36, but the
Rec. 709 transfer function is
usually used. See Gamma
in video
on page 261.
to 90%) of 200+20 ns is imposed, where the midpoint
of the transition is coincident with the idealized sync.
Switching between video sources is performed in the
vertical interval, to avoid disruption of sync or picture.
Switching occurs 30+5 laS after O H of the first normal
line of each field. In 576i systems, switching occurs
midway through line ...