Orban OPTIMOD-FM 8500S Operating Manual page 173

OPTIMOD-FM DIGITAL
622B), using a sophisticated, proprietary optimization program. The curves are
matched to better than 0.15 dB. 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 8500S HF Enhancer is a program-controlled HF shelving equalizer. It intelligently
and continuously analyzes the ratio between broadband and HF energy in the input
program material and 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.
band compressor/limiter can be operated in five-band or two-band mode. In addi-
tion to using a special high-frequency limiter, the 8500S controls high frequencies
with distortion-canceled clipping. The clipper in the 8500S operates at 256 kHz-
sample rate and is full anti-aliased.
Ordinarily, the gain reduction in band 5 is slaved to the gain reduction in band 4 (as
determined by the setting of the B4 > B5 C
dependent 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 8500S's clip-
ping 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).
The multiband compressor/limiter offers look-ahead compression to minimize over-
shoot and its associated clipping distortion. This look-ahead functionality can be
turned on or off, or the 8500S's speech/music detector can activate it automatically.
See Lookahead on page 3-62.
The Ultra-low Latency structure does not offer compressor lookahead.
"Intelligent" Clipping: The 8500S prevents excess clipping distortion by dynami-
cally reducing the drive level to the clippers as required, using an intelligent analysis
of the clipping distortion produced in the final clipper and overshoot compensator.
Note that, in the interests of minimizing latency, the Ultra-low Latency
structure does not have this feature. This is the principal reason why it
achieves less on-air loudness that the optimum-latency and low-latency
processing for a given amount of distortion.
Speech Mode: You can set many of the processing parameters separately for
speech signals, as detected by the 8500S's speech/music detector. This allows you to
tune the processing separately for speech and music.
A S
D
PEECH ETECT
the Speech/Music detector. This control is contained in the processing preset. In five-
band presets, it is found in the Speech Mode screen (Advanced Modify 6) and in
two-band presets, it is found in the Two Band screen (Advanced Modify 4).
control allow you to force the 8500S into Music mode, overriding
control); these bands are only in-
OUPLE
3-9
OPERATION