Orban OPTIMOD-FM 8500S Operating Manual page 203

OPTIMOD-FM DIGITAL
monic distortion.
This can be useful if you want maximum bass punch, because this setting
allows bass transients (like kick drums) to make square waves. The peak
level of the fundamental component of a square wave is 2.1 dB higher
than the peak level of the flat top in the square wave. Therefore, this al-
lows you to get low bass that is actually higher than 100% modulation—
the harmonics produced by the clipping work to hold down the peak
level.
The square waves produced by this clipper are filtered through a 6
dB/octave lowpass filter that is down 3 dB at 400 Hz. This greatly reduces
the audibility of the higher clipper-generated harmonics. Nevertheless,
the downside is that material with sustained bass (including speech) will
sound substantially less clean than it will with the Medium or Soft set-
tings.
Note that the H
clipped bass waveforms become. (See Hard Clip Shape on page 3-41.)
•
LLH differs in two ways from the normal H
ARD
•
automatically defeats the compressor lookahead. This action
LLH
ARD
is functionally equivalent to setting the L
except that it reduces input/output delay by 5 ms).
•
prevents the bass clipper from switching to M
LLH
ARD
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
that the Five-Band structure is active, L
is set to H
M
ODE
speech/music detector.) If the bass clipper is set to LLH
speech/music detector will reset the clipper threshold to the setting speci-
fied by the S
sults in very little bass clipper action during speech. This prevents audible
speech distortion that this clipper might otherwise introduce.
Switching the B
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
per mode and some without, switching between these presets is likely to
cause clicks unless you do it during silence. However, these clicks will
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 H C
ARD
over the sound of the H
C S control determines how squared-off the
ARD LIP HAPE
EDIUM
. (See "Lookahead" on page 3-63 for more about the
ARD
control. The default setting is "0 dB," which re-
BCT
PEECH HR
to LLH
C M
ASS LIP ODE
S control (in Advanced Control) offers further control
LIP HAPE
and LLH
ARD
mode of the bass clipper:
ARD
control to O
OOKAHEAD
when speech is detected, provided
is H , and the B
ATENCY IGH
(from any other mode) removes
ARD
and LLH
ARD
modes. See page 3-41.
ARD
OPERATION
,
UT
mode
EDIUM
C
ASS LIP
, the
ARD
bass clip-
ARD
bass clip-
ARD
3-39