Panasonic DVD-L50PM - Manual (Page 57)

Picture type (i/P/B) Dolby Digitai (AD-3)
The MPEG 2 standard adopted for DVD
uses the following 3 picture types for the
coding of each picture (frame) on the
screen.
I: l-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 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
Digital audio output connector
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 minima! effect on the external en­
vironment.
Dolby 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Confidential Unpublished Works.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.
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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