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DISCS
The CLD-901 can play both LaserVision discs and Compact Discs.
Unlike conventional phonograph records, these
discs are played back from the inside edge out.
LaserVision discs are available as both standard play discs and extended play discs.
Discs with digitally recorded
sound
are also available.
STANDARD
PLAY (CAV) DISC
Standard
play discs are played at constant angular
velocity (CAV).
One frame
is recorded
for each
revolution of the disc, and a 12-inch disc can contain
up to 54,000 frames on one side (normal playing time
30 minutes).
Still-frame/step
frame,
multi-speed,
repeat, and other forms of trick playback are available
with these discs.
With
discs
on which
chapter
numbers
have
been
recorded, chapter skip and chapter program play etc.
are possible.
EXTENDED
PLAY (CLV) DISCS
These discs are recorded at a constant linear velocity
(CLV).
When the signal is recorded in this way, the
number of frames that are recorded per revolution of
the disc, increases as the recording advances towards
the outer edge, so in comparison with standard play
discs longer play is possible.
(For normal playback of
12-inch discs,
a maximum
playback time is 1 hour is
possible.)
Extended play discs cannot be used for trick playback,
but search (random access) and repeat playback may
be performed.
With
discs on which
chapter
numbers
have
been
recorded, chapter skip and chapter program play are
also possible.
:
*
The playback time varies according to the disc.
4
<VRB1001 >
LASERVISION WITH DIGITAL SOUND DISCS
dicital
SOUND
The jackets and labels of these
discs bear the symbol on the left.
in addition to the conventional analog sound signals,
LaserVision
with Digital Sound
Discs also have re-
corded
on
them
the
same
kind
of
pulse-code-
modulated
sound
signals
that
are
recorded
on
Compact Discs.
The high quality pictures of these LaserVision Discs,
can
be enjoyed together with digital sound, at the
same time.
The
two types
of sound,
digital
and
analog,
are
recorded
onto
the
discs
using
different
frequency
bands, as shown in the figure.
For the sake of convenience, this book calls these
sound signals ''digital sound'' and ''analog sound"
Digital sound
Analog sound
Video signals
Qa ise)
Recording
level
2
4
6
8
10
12
Frequency
14 MHz
Recording signal spectrum
CAUTION WHEN
USING THE DISC
All rights reserved.
Unauthorized
public
performance,
broadcasting
or
copying is a violation of applicable laws.
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