Ikegami BS-98 - Page 42

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BS-98 1409 VER1 (U) (E)
3.1 HDTV Format
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Segmented Frame
Segmented frame is a method for converting a progressive video separated for 1 line each into an interlaced video.
Ithasbeendescribedforthesakeofconvenience,23.976is24and47.952is48.
OddLines EvenLines OddLines EvenLines
SegmentA
1stField
1/48sec
1/24sec
SegmentB
2ndField
SegmentA
1stField
Frame#1 Frame#2
SegmentB
2ndField
24p
24psF
The feature of the segment frame is that there is no movement in the fi rst frame (Segment A) and the second frame (Segment B).
When these two frames are synthesized, one progressive signal can be created.
PsF (Progressive segmented Frame) method has been widely used from the time when the 24P format appeared. That is because
this method enables to create the conventional interlace equipment without making a large difference.
In addition, in recent years, there are more cases that this method is used for the time lapse video effect in television broadcasting,
as the 1080PsF29.97 signals can be used as 1080i59.94, and the 1080PsF25 signals can be used as 1080i50.