Orban 8218 User Manual

8218
Digital
Stereo
Encoder
INTRODUCTION
8218
Digital
FM
Stereo
Encoder
More
and
more
FM
stations
are
transporting
their
audio
digitally,
from
studio
to
transmitter.
However,
digital
links
typically
handle
left/right
rather
than
composite.
Orban’s
8218
Digital
FM
Stereo
Encoder
can
extend
your
all-digital
performance
through
to
the
stereo
encoder.
It’s
designed
to
perfectly
complement
Orban’s
OPTIMOD-FM
digital
audio
processors
in
an
all-digital
transmission
system.
All
encoding
is
done
entirely
in
the
digital
domain by
a
dedicated
DSP chip,
producing
two
analog
composite
outputs
with
outstanding
specifications
and
long-term
stability.
The
8218
accepts
either
analog
or
AES/EBU
digital
inputs.
The
digital
input
automatically
synchro-
nizes
to
and
de-jitters
any
standard
incoming
sampling
rate.
In
addition,
it
responds
to
status
bits
in
the
AES/EBU
data
stream
that
may
be
used
to
turn
de-emphasis
on
or
off.
This
feature
allows
automatic
switching
of
pre-emphasis
and/or
J.17
(NICAM)
de-emphasis
to
accom-
modate
different
transmission
schemes.
An
Overshoot
Control
Limiter
can
be
applied
to
the
incoming
audio,
limiting
overshoots
to
less
than
0.5dB
while
introducing
minimal
(or no)
audible
artifacts
and
without
contaminat-
ing
the
baseband
spectrum
above
57kHz.
The
Overshoot
Control
Limiter
is
particularly
useful
if
the
processed
audio
has
been
passed
to
the
8218
through
a
digital
STL
that
uses
lossy
encoding,
like
MPEG,
Dolby,
or
APT-X.
The
Overshoot
Control
Limiter
uses
lookahead
techniques,
and,
when
activated,
adds a
time
delay
of
4
milliseconds
to
the
stereo
encoding
process.
Features
•
>70dB
separation,
20Hz-
15kHz.
• <-90dB
noise
and
distortion
(after
de-emphasis,
and
referenced
to
100%
modu-
lation
output).
•
Digitally-created
composite
signal,
from
either
analog
or
AES/EBU
digital
input.
The
8218
also
accepts
two
analog
SCA
inputs,
and
sums
them
with
analog
composite
output.
The
analog
composite
appears
on
two
outputs,
each
with
individual
level
control.
•
Built-in
sample
rate
converter
that
allows
8218 to
accept
any
digital
AES/EBU
input
sample
rate
between
32kHz and
48kHz.
• Recessed
front
panel
controls
for
selecting
Input
type
(Analog/Digital),
Ste-
reo/MonoL/MonoR
mode,
Pilot
On/Off,
and
Crosstalk
Tests.
•
Front
panel
metering
of
Left
and
Right
inputs
plus
Composite
or
Pilot
outputs.
• Recessed
front
panel
multi-tum
screwdriver
potentiometers
for
Analog
Left,
Analog
Right,
and
Digital
input
levels, as
well as
for
Pilot,
Composite
#1,
and
Composite
#2
output
levels.
•
Recessed
rear
panel
DIP
switch
for
selecting
pre-emphasis
In/Out,
pre-emphasis
type
(50ps/75(J.s), J.17
de-emphasis
In/Out,
and
whether
or not
the
stereo
en-
coder’s
pre-emphasis
and
J.17
de-emphasis
settings
respond
to
status
bits
of the

Orban 8218 Specifications

General

Brand	Orban
Model	8218
Category	Inverter
Language	English