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WIDEBAND
mode
when
a very
fast
release
time
is
used.
However,
a fast
release
time
may
fatigue
listeners
with
high- quality
receivers,
and
such
a
release
time
requires
more
careful
operator
gain
riding
than
slower
release
times
do. In addition, hiss from 16mm optical sound tracks may be noticeably
pumped up and down.
HYBRID " WIDEBAND/INDEPENDENT"
mode ( BASS
COUPLING
between " 2"
and " 7") compromises between the two sounds. This mode is useful if you feel
that
the INDEPENDENT
mode provides too
much bass for
your
taste --
you
can use the BASS COUPLING control to adjust the balance between bass and
the rest of the spectrum.
Adjusting The Other Controls: Once you have chosen your adjustment of the BASS
COUPLING control, you must adjust the rest of the controls to finish " customizing"
your
sound.
MAKE
ADJUSTMENTS JUDICIOUSLY, AND LISTEN CAREFULLY TO
ALL TYPES OF AUDIO TYPICAL OF YOUR PROGRAMMING.
There is no objective " right way" or " wrong way" to set up audio processing. The
results must be subjectively evaluated on a variety of receivers over long periods
of
time. We suggest that
you make only small adjustments, and that you keep a
careful log so that you can return to the settings that you like best.
Clipping:
This
is
the
prime
control
over
the
loudness/distortion
tradeoff.
In
our
opinion, " 0" is the best setting, giving results that sound " undistorted" even on high
quality receivers -- provided that input program material is clean and that slower
release times ( i.e., above " 6" in LIN mode or above " 3" in EXP mode) are used. If
faster
release
time
settings are used,
or
if
input
program
material
is somewhat
distorted,
the
CLIPPING
control
should
be
turned
down
if
you
notice
distortion.
Particularly in WIDEBAND mode, the CLIPPING control can sometimes be turned
up if you are operating with small amounts of gain reduction, slow release times,
and ultra- clean program material.
Depending
on
the
practice
at
other
stations,
maximum
loudness
achievable
by
OPTIMOD-TV processing may not be desirable. ( Viewers could get annoyed if they
had to reset the volume frequently when changing channels.) The CLIPPING control
can be used to adjust your loudness relative to the other stations in your market to
achieve
consistency.
This
usually
requires
setting
the
CLIPPING
control
quite
conservatively ( in
the "-"
area).
A beneficial
side- effect
of
such
conservative
operation will be cleanest sound and best high frequency response.
Release
Time
And
Amount
Of
Gain
Reduction:
The
average
amount
of
gain
reduction is determined by the setting of the L and R INPUT ATTEN controls. To
obtain
more
gain reduction,
turn these controls up, thus
driving the compressors
harder.
The action of the RELEASE
TIME
control
has been optimized for resolution
and
adjustability.
When
the RELEASE
TIME
control
is
set
to " 3"
and
the RELEASE
SHAPE to EXPonential, the amount of gain reduction used is relatively non- critical.
(The
amount
of
gain
reduction
is
controlled
both
by
the
setting
of
the
INPUT
ATTENUATOR
controls
and
average
levels
from
the
console
or
switcher.)
The GATING
feature ( which essentially " freezes" the gain) prevents noise rush- up
during program pauses ( particularly with noisy 16mm optical sound tracks and news
actualities)
and
makes
the
25dB
gain
reduction
range
usable.
This
function
was
designed such that
the gain
does not gel " stuck"
forever
in
the O to 15dB gain
reduction region,
so
low-level
program
material
is
eventually
increased
in
level.
Since
gain
recovery
is
slow
in
GATED
mode,
this
gradual
increase
in
level
is
essentially imperceptible.
5-5
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