CCI R
System
B
and
Similar
625/50
Systems
(including PAL)
In most 625-line, 50
Hz
field-rate systems, identifica-
tion
of
parts
of
the picture relies primarily on continuous
line numbering rather than on field-and-line identification,
except
for
PAL systems.
The
CCI
R frame starts with the first (wide) vertical sync
pulse following a field which
ends
with a half-line
of
video.
The first line after the
second
equalizing interval
is
line 6;
the first picture line
is
line 23 (half-line
of
video). The first
field
of
the frame contains lines 1 through the first half
of
line 313, the picture ending witha a full line
of
video (line
310).
The
second
field
of
the frame commences
with
the
leading
edge
of
the first (wide) vertical sync pusle (middle
of
line 313).
and
runs through line 625
(end
of
equalizing
interval). The
first
full line after the equalizing interval
is
line 318; the picture starts on line 336 (full line).
The first field
is
referred
to
as
"odd,"
the second field
as
"even." Note that the identification
systems
for
System M
and
System B "re reversed.
In the four-field PAL
sequence
with Bruch
Sequence
Color-burst blanking, the fields
are
identified
as
follows:
Field 1: Field that follows a field ending in a half-line
of
video, when preceding field
has
color burst on the
last
full
line. Field 1 lines
are
1 through 312 and
half
of
line 313. Color burst starts on line 7
of
Field 1; a half-line
of
video appears on line 23.
Field 2: Field that follows a field ending in a
full
line
which
does
not
carry color burst. Field 2 lines
are
the last half
of
line 313 through line 625. Color
burst starts on line 319 (one line
without
burst
following the last equalizing pulse); a
full
line
of
video
appears
at line 336.
Field 3: Field that follows a field ending in a half line when
preceding field
has
no color burst on its last
full
line. Field 3 lines
are
1 through the
first
half
of
line 313. Burst starts
on
line 6 (immediately
following the last equalizing pulse); a half-line
of
video
appears
on line 23.
Field
4:
Field that follows a field ending in a
full
line
carrying color burst. Field 4 lines
are
the second
half
of
line 313 through line 625. Color burst
for
Field 4 starts on line 320 (two
full
lines
without
burst
follow
the last equalizing pulse); video starts
with
a
full
line on line 336.
106
465B/DM44
Operators
@
I
I
I
I
I
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