Panasonic DVDL50D - Manual (Page 81)

Picture type (l/P/B) Dolby Digital (AC-3)
The MPEG 2 standard adopted for DVD uses
the following 3 picture type 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 recommended 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 comparing the
previous and subsequent i-Picture or P-
Picture, It has the lowest volume of
information.
General Picture type
Predict
Digital audio output connector
(Optical)
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 from electrical
interference from external sources and its
ability to prevent the generation of noise and its
minimal effect on the external environment.
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 Confidential Unpublished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 increased 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 quality audio
than that of a CD.
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