Orban Optimod-TV 8382 Operating Manual Download

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3-34

OPERATION

ORBAN MODEL 8382

The two-band compressor processes audio in a master band for all audio above ap-
proximately 200Hz, and a bass band for audio below approximately 200Hz. The

ASS

control determines how closely the on-air balance of material below 200Hz

matches that of the program material above 200Hz.

Settings toward 100% (wideband) make the output sound most like the input. Be-
cause setting the

ASS

control at 100% will sometimes cause bass loss, the most

accurate frequency balance will often occur with this control set between 70% and
90%. The optimal setting depends on the amount of gain reduction applied. Adjust
the

ASS

control until the band 1 and band 2 Gain Reduction meters track as

closely as possible.

With the

(2B Release) control set to 2 dB/second, setting the

ASS

control

toward 0% (independent) produces a sound that is very open, natural, and non-
fatiguing, even with large amounts of gain reduction. Such settings provide a bass
boost on some program material that lacks bass.

With fast release times, settings of the

ASS

toward 100% (wideband) do not

sound good. Instead, set the

ASS

control toward 0% (independent). This com-

bination of fast release and independent operation of the bands provides the
maximum loudness and density on small radios achievable by the Two-Band struc-
ture. However, such processing may fatigue listeners with high-quality receivers, and
requires you to activate the AGC to control the average drive level into the two-
band compressor, preventing uncontrolled build-up of program density. Instead of
operating the Two-Band structure like this, you should choose a Five-Band preset in-
stead.

Bass Clip

(“Bass Clip Threshold”): See page 3-28.

2B Clip

is a compression threshold control that equally affects the bass and master

bands. It sets the drive level to the high frequency limiting and multiband distortion-
controlling processing that precedes the final clipping section. The distortion-
controlling section uses a combination of distortion-cancelled clipping and look-
ahead processing to anticipate and prevent excessive clipping distortion in the final
clipper.

2B High Frequency Limiting

sets the threshold of the high frequency limiter in

the Two-Band structure. When this control is set lower, gain reduction does more
high frequency limiting. When this control is set higher, distortion-cancelled clipping
does more high frequency limiting. This control controls the tradeoff between loss
of high frequencies (due to high frequency limiting) and excessive distortion (due to
clipping).

Loudness Control Threshold

determines the maximum subjective loudness pro-

duced by the processing. This control determines the subjective loudness level at
which the Loudness Controller will take control of the Two-Band compressor and
produce more gain reduction than the compressor would have otherwise produced
without loudness control. We believe that few users will have any reason to change
this adjustment (it was not available to the users of our analog 8182A processor).
However, if you feel that the Loudness Controller is not controlling the loudness of