Specifications

CCIR
System
B and Similar
625150 Systems
(including
PAL)
ln
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 CCtR
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 are
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
4658/DM44
OPerators