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CX ENCODER/DECODER
MODEL
1181
The UREI
Model 1181
CX
Encoder/Decoder
offers
the
mastering, production or
mixdown
facility
the
ability
to
precisely
record
and
playback according
to
the
CBS
Technology
CX
disc noise
reduction standard.
The
CX
noise reduction
system
is
designed
for
phonograph
and
video
disc
recording
and
reproduction.
In
the
encoding
process
which
is
done
during
disc
mastering,
all
signals
below
a
preset threshold
level
are not
compressed
—
in
the
CX
20
position,
the threshold
is
-40
dB
ref.
0
VU*,
and
in
the
CX
15
position,
the threshold
is
-30 dB.
Above
this
threshold,
all
program
is
compressed
with
2:1
ratio,
using
a
signal-
dependent
variable
time
constant.
In
decoding,
complementary
expansion takes
place,
using the
same
signal-dependent
variable
time
constant.
The 1181
includes
encoders
for
Preview
and Program
channels
and
a
decoder which
may
be switched
to
audition preview,
program
or
any
"line level"
external source.
The
encoders
are
highly
accurate
2:1
compressors
switchable
for
CX
15
or
CX
20
conformance. High technology
gain control
blocks,
audio
operational amplifiers
and
precision control
circuits
assure
excellent
performance and
long
term
stability.
The
decoder
or
expander
section
is
a
mirror
of
the encoder, using
the
identical
gain control
circuitry
to
assure accurate
play-
back
tracking.
Operating
modes
can
also
be
remotely
controlled
through
a rear
panel
connector so
that
the
1181
may
be
installed
wherever
convenient.
*For
phonograph
records,
0
VU
corresponds
to
3.54
cm/sec
groove modulation
at
1
kHz.
FEATURES:
•
Preview,
Program and
Audition
in
two
rack
spaces
(3V2").
•Tamper
resistant,
screwdriver
adjust
setup
controls
behind
security cover.
•
Fully
automatic
operation
after
initial
setup.
No
special
techniques
need be
learned by the
mastering
engineer.
•
Relay
bypass
with
power
off.
•
LEDs
allow
setup
with
0.1
dB
resolution.
•
Extremely low
noise
and
distortion.
•
Remote
mode
selection.
•
Full
metering
matrix.
•
Built
and backed
by UREI.
UNITED
RECORDING ELECTRONICS
INDUSTRIES
8460 SAN
FERNANDO
RD.,
SUN
VALLEY,
CALIFORNIA 91352
TELEX 65-1389
UREI
SNVY
(213)
767-1000
MODEL
1181
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