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10
Signal
Format
Analog
Digital
SD/ED
HD
2-2.
TV
Signal
Formats
The
digital
TV
standards
allow
several
different
formats.
Broadcasters
can
choose
between
four
formats:
?
480p
-
The
picture
is
704
x
480
pixels,
sent
at
60
complete
frames
per
second
(480i
is
also
possible,
sent
at
60
interlaced
frames
per
second).
?
720p
-
The
picture
is
1280
x
720
pixels,
sent
at
60
complete
frames
per
second.
?
1080i
-
The
picture
is
1920
x
1080
pixels,
sent
at
60
interlaced
frames
per
second
(30
complete
frames
per
second).
(The
"p"
and
"i"
designations
stand
for
"progressive"
and
"interlaced."
In
a
progressive
for-
mat,
the
full
picture
updates
every
sixtieth
of
a
second.
In
an
interlaced
format,
half of
the
pic-
ture
updates
every
sixtieth
of
a
second.)
The
480i
format
is
called
SD.
480p
format
is
called
the
ED
format.
480i
is
roughly
equivalent
to
a
normal
analog
TV
picture.
The
720p
and
1080i
formats
are
called
the
HD
formats.
Some
analog
televisions
can
display
a
picture
720
pixels
wide
by
480
pixels
high,
that's
a
total
of
345,600
pixels.
HD
digital
signals
can
have
a
maximum
resolution
of
1920
x
1080,
that's
2,073,600
pixels,
or
six
times
more
pixels
than
the
older
resolution.
Pictures
will
be
crisper
and
cleaner,
with
more
detail
in
every
close-up
and
every
panorama.
Standard
Comparison
Table
Active
Lines
480 480 720
or
1080
Sound
Stereo
(2
ch)
Dolby
Digital
(5.1
ch)
Dolby
Digital
(5.1
ch)
MPEG
Audio
(2
ch)
Aspect
Ratio
4:3
4:3or16:9
16:9
Resolution
720
x
480
640
x
480
1280
x
720
704
x
480
1920
x
1080
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