Orban OPTIMOD-FM 8600Si, Operating Manual

Page: 212 / 356

3-46
OPERATION ORBAN MODEL 8600Si
Note that the
H
ARD
C
LIP
S
HAPE
control determines how squared-off the
clipped bass waveforms become. (See Hard Clip Shape on page 3-49.)
•
LLH
ARD differs in two ways from the normal
H
ARD mode of the bass clipper:
•
LLH
ARD automatically defeats the compressor lookahead. This action is function-
ally equivalent to setting the
L
OOKAHEAD
control to
O
UT
, except that it reduces
input/output delay by 5 ms).
•
LLH
ARD
prevents the bass clipper from switching to
M
EDIUM
mode whenever
speech is detected. By constraining the system in these ways, it ensures that the
delay is always 13 ms.
To minimize speech distortion, the speech/music detector automatically
switches the bass clipper to
M
EDIUM when speech is detected, provided
that the Five-Band structure is active,
L
ATENCY is
H
IGH , and the
B
ASS
C
LIP
M
ODE is set to
H
ARD . (See “Lookahead” on page 3-70 for more about the
speech/music detector.) If the bass clipper is set to
LLH
ARD , the
speech/music detector will reset the clipper threshold to the setting speci-
fied by the
S
PEECH
BCT
HR control. The default setting is “0 dB,” which re-
sults in very little bass clipper action during speech. This prevents audible
speech distortion that this clipper might otherwise introduce.
Switching the
B
ASS
C
LIP
M
ODE to
LLH
ARD (from any other mode) removes
five milliseconds of delay from the signal path. Switching can cause audi-
ble clicks, pops, or thumps (due to waveform discontinuity) if it occurs
during program material. If you have some presets with
LLH
ARD bass clip-
per mode and some without, switching between these presets is likely to
cause clicks unless you do it during silence. However, these clicks will nev-
er cause modulation to exceed 100%.
One of the essential differences between the
H
ARD and
LLH
ARD bass clip-
per modes is that switching between Hard and Med does not change de-
lay and is therefore less likely to cause audible clicks.
The
H
ARD
C
LIP
S
HAPE control (in Advanced Control) offers further control
over the sound of the
H
ARD and
LLH
ARD modes. See page 3-49.
•
M
EDIUM
uses more sophisticated signal processing than
H
ARD
to reduce distortion
substantially.
•
S
OFT uses the most sophisticated look-ahead signal processing to reduce distor-
tion further. Using
S
OFT
adds an additional 18 ms of delay to the processing (so
that the total is approximately 36 ms).
M
EDIUM and SOFT are not available in Low Latency mode. The bass clipping is always
H
ARD , but the
H
ARD
C
LIP
S
HAPE control is still available to “soften” the clipping.
8500-Style Peak Limiter Controls
All of the 8500-style peak limiter controls are common to the Intermediate Modify
and Advanced Modify screens except for
OSC
OMP
D
R and
H
ARD
C
LIP
S
HAPE , which
are only available in the Advanced Modify screen.