Connect-Tek CTIP-01 Dokumentacja Pobierz pdf (Strona 118)

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

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