OPTIMOD-TV DIGITAL
OPERATION
3-7
You can set the slope of the bass shelving EQ to 6, 12, or 18 dB/octave and adjust the
shelving frequency.
The 8382’s bass, midrange, and high frequency parametric equalizers have curves
that were modeled on the curves of Orban’s classic analog parametrics (like the
622B), using a sophisticated, proprietary optimization program. The curves are
matched to better than 0.15dB. This means that their sound is very close to the
sound of an Orban analog parametric. They also use very high quality filter algo-
rithms to ensure low noise and distortion.
The 8382 HF Enhancer is a program-controlled HF shelving equalizer that intelli-
gently and continuously analyzes the ratio between broadband and HF energy in
the input program material. It can equalize excessively dull material without over-
enhancing bright material. It interacts synergistically with the five-band compressor
to produce sound that is bright and present without being excessively shrill.
Multiband Compression:
The multiband compressor can be operated in five-band
or two-band mode. In addition to using a special high-frequency limiter, the 8382
controls high frequencies with distortion-canceled clipping. This clipper operates at
256 kHz-sample rate and is full anti-aliased.
Ordinarily, the gain reduction in band 5 follows the gain reduction in band 4 (as de-
termined by the setting of the
B4>B5
C
OUPLE
control); these bands are only inde-
pendent from the viewpoint of the downward expander and multiband clippers.
However, a high frequency limiter causes additional gain reduction in band 5 when
band 5 multiband clipping alone would be insufficient to prevent HF distortion. The
HF limiter uses a sophisticated analysis of the signal conditions in the 8382’s clipping
system to do this.
A clipper, embedded in the crossover, protects bands 1 and 2 from transient over-
shoot. This clipper has a shape control, allowing you to vary the “knee” of its in-
put/output transfer curve from hard (0) to soft (10).
Loudness Control:
The Two-Band structure contains a CBS Loudness Controller al-
gorithm, which controls the loudness of most commercials well enough to eliminate
viewer annoyance. It works by constantly monitoring the subjective loudness of the
8382's output. When subjective loudness would otherwise exceed a preset thresh-
old, the Loudness Controller enhances the normal gain control produced by the
processing with further gain reduction, preventing loudness from exceeding the
threshold. The user can adjust this threshold from the Full modify screen of any Two-
Band preset. The edited preset can then be saved as a user preset.
The Loudness Controller may reduce the dramatic effect of certain sounds in enter-
tainment programming, like gunshots, explosions, or screeching tires. Operators may
therefore want to turn the Loudness Controller on during commercial breaks and
off during normal programming. Most Two-Band presets have the Loudness Control-
ler on. The easiest way to turn the Loudness Controller off is to recall the 2B GEN
PUR NO LC preset. If you have created a custom preset, you can save two varia-
tions—one with the loudness controller on and one with it off—and recall these by
remote control via the 8382’s GPI inputs.
Summary of Contents for Optimod-TV 8382
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