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Sony CDU-541 - CD-ROM Glossary

Sony CDU-541
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~DU-5ql
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.5.
C"D-ROM
Glossary
CD-ROM
- Compact Disc Read Only
Memory
The
CD-ROM
was
developed
by
N.V.
Philips
& Sony
Corporation.
The
'RED
BOOK'
and
'YELLOW
BOOK'
documents
describe
the
medium.
Sub-Channel
- The
signal
from
the
compact
disc
consists
of
a main
channel
and
a
sub-channel.
The
sub-channel
is
divided
into
three
parts.
The P
sub-
channel
is
part
one and
is
used
with
CD-Audio. The Q
sub-channel
is
part
three
and
contains
useful
information.
such
as
the
control
field
and
MSF
address.
-The
R.
S.T,U,
V and W
sub-channels
collectively
are
treated
as
part
three.
Control
Field
- Four
bits
in
the
Q
sub-channel
data
that
indicate
whether
the
track
is
CD-ROM
or
CD-Audio.
If
the
track
is
CD-Audio
then
three
bits
are
used
to
indicate
use
of
pre~emphasis,
copy
protection,
and
whether
the
audio
is
two
or
four
channel.
TNO
-
Track
Number. A
disc
has
logical
segments
track
numbers
range
from one
to
ninety-nine.
always
of
the
same
type.
A
track
can
contain
data.
A
disc
can
start
at
any
track
number.
which
are
called
tracks.
The
The
data
within
a
track
is
either
CD-ROM
or
CD-Audio
TOe
- The
Table
Of
Contents
has
information
on
the
t~~e
of
each
track
and
the
starting
address
of
the
user
data
in
a
tracks.
This
information
is
encoded
in
the
Sub-Q
channel
during
tne
lead-in
area
of
the
compact
disc.
MSF
Address
-
The
address
on
the
disc
in
minutes,
seconds
and frame number.
All
three
must be
specified
to
determine
a
physical
location
on
the
disc
.
Absolute
MSF
Address - The
address
encoded
in
the
sub-channel
(and
header
of
CD-ROM)
which
is
the
elapsed
time
from
the
start
of
disc.
Relative
MSF
Address The
address
encoded
in
the
sub-channel
which
is
the
elapsed
time
from
the
start
of
a
track.
Frame -
One
frame
is
equal
to
1/75 second
of
elapsed
time.
Block
- A
block
commonly
refers
to
the
data
contained
in
one
frame.
However
there
are
other
meanings
attached
to
this
term
within
the
world
of
compact
disc.
Hold
Track
State
-
When
the
drive
enters
the
hold
track
state
the
optical
pick-up
of
jumps one
track
towards
the
inside
of
the
disc
at
the
specified
Sub-Q
address.
The
optical
pick-up
traces
the
groove
of
the
disc
until
detecting
the
address
and
again
jumps one
track
towards
the
inside
of
the
disc.
******************************************************************************
END
OF
DOCUMENT
******************************************************************************
CDSCSI.WS6
5-79

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