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Picture type(l/P/B)
Dolby
Digital
(AC-3)
The
MPEG
2 standard
adopted
for
DVD
uses
the following
3
picture
types
for
the
coding
of
each
picture
(frame)
on
the
screen.
This
is
the standard
picture type,
and
each
picture
is
coded
separately.
Since
it
features the best
picture
quality,
it
is
rec-
ommended
that
the
screen
be
frozen
with
l-Picture
when
the
picture quality
is
to
be
adjusted.
P:
P-Picture (Predictive
coded
picture)
This
picture
type
is
computed on
the
basis
of
a
past
l-Picture
or P-Picture.
B: B-Picture (Bidirectionally-predictive
coded
picture)
This
picture
type
is
computed
by compar-
ing
the previous
and subsequent
l-Picture
or
P-Picture.
It
has
the lowest
volume
of
information.
General
Picture
type
Predict
Predict
Digital
audio output connector
(Optical)
The
digital
audio output connector
(opti-
cal)
converts
electrical
signals
into
optical
signals
and
transfers
them
to
the
amplifi-
er.
Consequently,
it
has a
number
of
fea-
tures including
its
immunity from
electrical
interference
from
external
sources and
its
ability
to
prevent the generation
of
noise
and
its
minimal
effect
on
the
external
en-
vironment.
Doiby
Digital
(AC-3)
is
a
digital
sound
compression
technique developed
by
the
Dolby
Laboratories,
Inc.
Supporting
5.1
-channel surround sound,
as
well
as
stereo (2-channel)
sound,
this
technique enables
a
large
quantity
of
sound
data
to
be
efficiently
recorded
on a
disc.
Manufactured under
license
from Dolby
Laboratories.
"Dolby",
"AC-3",
"Pro
Logic"
and
the
double-D symbol
are
trademarks
of
Dolby
Laboratories.
Confidential
Unpublished
Works.
©
1992-1
997
Dolby
Laboratories,
Inc.
AH
rights
reserved,
Dolby Pro Logic Surround decoder
This
is
a
unit
which uses
the
Dolby
Surround
(Pro Logic)
system
to restore
4-channel
signals
which were recorded
on 2 channels back
to
the signals
of
4
separate channels
during
playback.
Compared
with
Dolby
Digital
(AC-3)/
5.1
channel surround sound,
the
channel
separation
is
not
as
good and
surround
signals
can be reproduced
only
up
to
a
frequency
of
7
kHz.
dts
(digital
theater
systems)
The
digital
theater
systems
(dts)
is
a
5.1-
channel surround
sound
system,
which
is
widely
used
in
movie
theaters
around
the
world,
it
allows the
bit
rate to
be
in-
creased
in
order
to
provide
good sound
quality
without excessively
compressing
the
data.
Linear
PCM
audio
(LPCM)
This
refers to
a
signal
recording format
used
in
a
CD.
While a
CD
is
recorded
in
44.1
kHz/16
bit,
a
DVD
is
recorded
in
48
kHz/16
bit
up
to
96 kHz/24
bit,
thus achieving higher
quali-
ty
audio than
that of
a CD.
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