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[ Picture
type (I/P/B)
]
The MPEG 2 standard adopted for DVD uses
the following 3 picture type for the coding of
each picture (frame) on the screen.
h I-Picture (Intra coded picture)
This is the standard picture type, and each
picture is coded separately. Since it features
the best picture quality, it is recommended that
the screen be frozen with I-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 I-Picture or P-Picture.
B: B-Picture (Bidirectionally-predictive
coded picture)
This picture type is computed by comparing the
previous and
subsequent
I-Picture or
P-
Picture.
It
has
the
lowest
volume
of
information.
General Picture type
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[ Oolby Diglta! (ACi3)
]
Delby
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Unpublished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. © 1992-1997 Dolby Laboratories, Inc.
• All rights reserved.
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.
Predict
The digital audio output connector
(optical)
converts electrical signals into optical signals
and
transfers
them
to
the
amplifier.
Consequently,
it has a number
of features
including
its
immunity
ff'om
electrical
interference
from
external
sources
and its
ability to prevent the generation of noise and its
minimal effect on the external environment.
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 increased in
order to provide good sound quality without
excessively compressing the data.
This refers to a signal recording format used in
aCD.
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 quality audio
than that of a CD.
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