Advanced Clipper Controls; The Two-Band Structure - Orban Optimod-FM 8300 Operating Manual

OPTIMOD-FM DIGITAL
never cause modulation to exceed 100%.
One of the essential differences between the H
per modes is that switching between Hard and Med does not change de-
lay and is therefore less likely to cause audible clicks.
The C
S
LIP
the sound of the H

M uses more sophisticated signal processing than H
EDIUM
substantially.

S uses the most sophisticated look-ahead signal processing to reduce distor-
OFT
tion further. Using S
that the total is approximately 36 ms).
and
M
EDIUM SOFT
, but the H
H
ARD ARD

Advanced Clipper Controls

Overshoot Compensator Drive sets the drive level into the overshoot compensa-
tor with reference to the final clip threshold, in units of dB. The normal setting is "0
dB."
The overshoot compensator can produce audible distortion on material with strong
high frequency content (like bell trees), and this control lets you trade off this dis-
tortion against loudness. (Such material can cause strong overshoots, forcing the
overshoot compensator to work hard to eliminate them.) We do not recommend
operating this control above "0" because this would reduce the effectiveness of the
distortion cancellation used in earlier processing. However, you can reduce it below
"0" if you value the last bit of high frequency cleanliness over loudness.
The overshoot compensator works at 256 kHz sample rate and is fully anti-aliased.

The Two-Band Structure

The Two-Band structure consists of a slow two-band gated AGC (Automatic Gain
Control) for gain riding, followed by an equalization section, a gated two-band
compressor, a high-frequency limiter, and a complex peak limiting system similar to
the one used in the Five-Band structure. Like the "Two-Band Purist" structure in
Orban's OPTIMOD-FM 8200, the 8300's Two-Band Structure is phase-linear through-
out to maximize sonic transparency.
The Two-Band structure has an open, easy-to-listen-to sound that is similar to the
source material if the source material is of good quality. However, if the spectral
balance between the bass and high frequency energy of the program material is in-
correct, the Two-Band structure (when its BAND COUPLING 2>1 control is operated
toward 0%) can gently correct it without introducing obvious coloration.
control (in Advanced Control) offers further control over
HAPE
and LLH
ARD ARD
adds an additional 18 ms of delay to the processing (so
OFT
are not available in Low Latency mode. The bass clipping is always
control is still available to "soften" the clipping.
C S
LIP HAPE
and LLH
ARD
modes. (See page 3-33.).
ARD
OPERATION
bass clip-
ARD
to reduce distortion
3-37