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DVF-R9030
43
Chapter 3: Other Information
Linear PCM (Pulse Code Modula-
tion): Audio signal format without
using compression. In the DVD
which has a very large disc capacity,
the linear PCM signal using high
sampling rate can be recorded.
Packed PCM : The packed PCM
(P.PCM) signal is obtained by com-
pressing the linear PCM signal fea-
turing large data amount and high
sampling rate. With this compres-
sion, the signal before compression
can be restored perfectly.
Sampling rate: Sampling refers to con-
verting an analog signal into digital
signal by slicing the analog signal
into fine parts at a certain time in-
terval and digitizing every sliced part.
The sampling rate is the count of slic-
ing per second. The original sound
can be reproduced more faithfully
when the sampling rate is higher.
Quantization bit: The quantization bit
count refers to the number used in
digitizing the sliced parts obtained
by slicing the analog signal as de-
scribed above. The quantization bit
count is the number of bits used in
Glossary
digitization per second. The original
sound can be reproduced more faith-
fully when the quantization bit
count is larger.
Bitstream (DVD): This is the generic
name given for the flow of data
based on a standard such as Dolby
Digital, DTS, MPEG, etc.
Downmixing: Conversion of multi-
channel audio signals of DVD or
DTS-CD into 2-channel stereo sig-
nals.
Downconversion: Conversion of PCM
signal with high sampling rate such
as 96 kHz and 192 kHz into a signal
with a sampling rate of 48 kHz or
44.1 kHz.
Decoder: A device for restoring stan-
dard audio signal from audio data
recorded based on coding into DVD
data, etc. This processing is referred
to as decoding.
Dolby Digital: A digital audio compres-
sion technology developed by Dolby
Laboratories, Inc. It is compatible
with 5.1-channel surround audio as
well as 2-channel stereo, and capable
of recording a large amount of au-
dio data efficiently in a disc.
DTS : Digital surround system devel-
oped by Digital Theater Systems, Inc.
MPEG (Moving Picture Expert
Group) (DVD, VCD): A digital
video and audio compression and
decompression system which is stan-
dardized as an international stan-
dard.
Aspect ratio: The ratio between the
horizontal and vertical sizes of pic-
ture displayed on a TV screen. The
aspect ratio of ordinary TV is 4:3, and
that of widescreen TV is 16:9.
Pan & scan (DVD): Method of display-
ing a horizontally-long picture re-
corded in 16:9 aspect ratio on a 4:3
TV screen by trimming part of picture.
In general, the trimming positions
for pan & scan are determined uni-
formly by the reproducing device.
However, the pan & scan of DVD al-
lows the software producer to specify
the trimming positions to be used
in playback.
Letterbox (DVD): Method of display-
ing a horizontally-long picture re-
corded in 16:9 aspect ratio on a 4:3
TV screen by attaching bands at the
top and bottom of the screen and
displaying the horizontally-long pic-
ture at the center of screen.
Frame (DVD, VCD): Each frame of a
moving picture, that is displayed 30
times a second with NTSC and 25
times a second with PAL. These TV
formats reproduce moving pictures
by displaying still pictures sequen-
tially.
Field (DVD, VCD): Part of a frame
obtained by diving the video data of
each frame by two. Each frame of
ordinary TV is constitute by display-
ing the fields alternately.
Frame still/Field still (DVD, VCD):
Types of still pictures obtained by
temporarily stopping a moving pic-
ture. The frame still picture may pro-
duce blur in the picture because it
displays two specific fields alter-
nately, but the picture quality is
higher. The field still picture has