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12
2-2. Progressive System
2-2-1. Principle of Progressive System
What is the progressive system?
In the conventional interlaced TV system, a video frame consists of the two fields that are alternately displayed one after another. It means that
the half the entire picture elements is displayed at a moment.
On the contrary, the progressive system displays all the picture elements (entire frame) at a time.
∗
1: One entire frame (amount of picture elements
that is equivalent to an entire video frame) of
video output signal from the CCD imager is
written in the DRAM (IC752).nventional inter-
laced TV sy
∗
2: The video signat are alternately displayedal that
is written in the DRAM (IC752) takes the two
outputs. One outpentire picture elements is diut
goes to HONEY (IC756) and the other output
goes to DRAM (IC752).ontrary, the progressive
sy
∗
3: The odd and evame) at a time.en signals that are
read out from the DRAM (IC752) as described
in the previous step
∗
2, are written and read to
and from the VFD (IC1501) simultaneously.
Functions of the DRAM and HONEY that are shown
on the monitor display. are illustrated in the figure in
the left.
CCD
OUT
OUT
VD
HONEY
DRAM
HONEY
+
IC752
OUT
VFD
RAM
VFD
OUT
VD
WRITE
READ
1st
2nd
READ
WRITE
A1
B1
A2
B2
B1
A2
B2
IC752
WRITE
READ
WRITE
Write
∗
2 Read
∗
1
∗
3
A1B1A2B2...........
A1A2...
B1B2...
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