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The CD VIDEO
SYSTEM
is the standard
name for the
"optical video
disc with digital audio"
system
that
encompasses both LDs and CDV discs.
The following mark is the standard mark for the CD VIDEO
SYSTEM and is found on all players and discs which conform
to the CD VIDEO SYSTEM format.
The following systems
are included in the CD VIDEO
SYSTEM:
E_—=
CD VIDEO
@ CDV (CD VIDEO CDV) discs
@
LaserVision
Discs
(CD VIDEO
LDs) containing digital
sound with sub-codes
@ Compatible players which can play CDs and CDV discs
@ Compatible players which can play CDs, CDV discs, and
LDs
CD VIDEO LDs (*4)
ACD VIDEO LD is an LD with digital audio which is encoded
with sub-codes (data such as TOC and track number data,
excluding audio and video signals).
LDs (LASERVISION DISCS) _
i?
or
f ba
LASER DISC
aservision
This mark is the standard mark for LaserVision video discs.
Players and discs which bear the LaserVision
mark are
mutually compatible as jong as they conform to the same
television system.
CAV (*5) DISCS
The jackets and labels of these discs are marked with a
"Standard Play Disc CAV" or "Standard Play" indication.
*
Playback time varies according to the contents of the
disc.
CLV (#3) DISCS
The jackets and labels of these discs are marked with a
"Extended Play Disc CLV" or "Extended Play" indication.
Signals are recorded on these discs at a constant
linear
velocity {CLV}, and the rotational speed during playback
varies from 1,800 rpm for the innermost track to 600 rpm
for the outermost track. As a result, one side of a CLV disc
can have a playback time of up to 6G minutes (for a 12-inch
disc), which is twice as long as a standard play (CAV) disc.
CLV discs are encoded with time numbers which correspond
to the elapsed play time from the beginning of the disc.
* Playback time varies according to the contents of the
disc.
LASERVISION DISCS WITH DIGITAL AUDIO (*6)
The jackets and labels of these discs bear the following
mark.
igi
digital
digital ., Ama
These are Laser Discs which contain digital audio signals in
addition to conventional analog audio signals. This feature
allows the high image quality of Laser Discs to be enjoyed
together with the superior quality of digital sound.
The
digital and analog audio signals are recorded on the disc
using different frequency bands.
LASERVISION
MULTI
AUDIO
DISCS WITH
DIGITAL
AUDIO
The jackets and labels of these discs bear the following
mark.
These are LaserVision discs in which the recorded digital
and analog audio signals differ in content.
This allows the
user to enjoy two different audio soundtracks by switching
between the digital and analog sound.
These are compact discs which also contain video signals.
Of the total 25-minute playback time of a CDV disc, 20
minutes
is encoded
with conventional
CD digital audio
signals (the "audio part").
The remaining 5 minutes is
encoded with both video and digital audio signals (the "video
part").
9
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