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Toshiba RD-XS32SU Manual

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Playback
Recording
Editing
Function setup
Others
Introduction
Library
Technical Information
About recording time
The recording time of a typical VCR (Video Cassette
Recorder) is determined by the length of a video tape
and recording speed (SP, LP, etc.). Video tapes with
various recording times are available in the market.
On the other hand, the recording time of a DVD-RAM/
R/RW depends on the bit rate (Mbps: amount of data
transmitted per second), which can be varied in
MPEG2 (Moving Picture Experts Group2)
compression technology.
As an example, when you pour water into a bucket
from a faucet, the faster the water flows, the sooner
the bucket is filled with water. On the other hand, the
slower the water flows, the more slowly the bucket is
filled. The DVD-RAM/R/RW is, so to speak, such a
bucket, and the degree you turn the faucet is bit rate,
the time required to fill the bucket with water is the
recording time available for a disc. The higher you set
the bit rate (making much more water flow), the
sooner a disc is filled. Consequently, the recording
time becomes shorter. The lower you set the bit rate,
the longer time it takes to fill a disc.
About picture quality (SP, LP, Auto, Manual mode)
The higher you set the bite rate, the more the volume
of information for the picture. The lower the bit rate,
the less the volume of picture information.
However a high bit rate does not always mean that the
picture quality is high. The difference between the 1.4
Mbps and 9.2 Mbps is obvious, but when comparing
similar bit rates, the difference may be insignificant.
Generally when you set the bit rate low for longer
recording time, the data volume shortage will result in
a lack of detail information. As a result, the picture
quality is decreased (more noticeable with dynamically
moving images). For example, square noises (block
noise) may occur in a scene with fast action or a
scene with light and shadows, such as a water
surface.
This recorder has a two settings, 2 hour recording at
“SP” mode or 4 hour recording at “LP” mode (both
assume a blank 4.7 GB DVD-RAM). It is
recommended to consider the “SP” mode as a
standard mode and use the “LP” mode when you want
to record for long time regardless of the picture quality.
If you want to record for about 2 hours or are uncertain
which one to select, select the “AT” mode.
On a blank 4.7 GB DVD-RAM disc, the “Auto” mode
automatically sets the appropriate bit rate
corresponded to the recording time from about 1 hour
to up to 2 and a half hours so that you can achieve the
best picture quality. If a part of a DVD-RAM disc has
already been recorded, the “AT ” mode sets the bit rate
suitable for the remaining space on the disc. (The
picture quality is determined referring the remaining
space just before recording. When the remaining
space is scarce in the disc, the picture quality may
decrease from what you set beforehand or the
recording may stop halfway.) “AT” mode is available
also on DVD-R/RW recordings.
When you want to record a music program or
animation with high picture quality, it is recommended
that you select the “Manual” mode. If you select more
than 6 Mbps, you can usually record with considerably
higher picture quality. However the higher you set the
bit rate, the shorter the recording time.
D /M1, D /M2
Sound recording format onto DVD-RAM discs. When
recording, sounds are converted into digital signals
and compressed. In playback, they are extracted to
the original sound. The standard differenciates
D /
M1 and
D /M2 in data volume to use. D /M1
and
D /M2 are applied the digital recording
technology for consumer products of Dolby
Laboratories. Dolby Digital 192 kbps is set for
D /
M1 and Dolby Digital 384 kbps for
D /M2.
L-PCM (Linear PCM)
Sound recording format, like Dolby Digital. However,
sounds are converted into digital signals and recorded
as they are without compression. This process
requires more data than Dolby Digital.
… 51 …


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